зеркало из https://github.com/github/ruby.git
3466 строки
89 KiB
C
3466 строки
89 KiB
C
/**********************************************************************
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enum.c -
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$Author$
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created at: Fri Oct 1 15:15:19 JST 1993
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Copyright (C) 1993-2007 Yukihiro Matsumoto
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**********************************************************************/
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#include "internal.h"
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#include "ruby/util.h"
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#include "id.h"
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VALUE rb_mEnumerable;
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static ID id_next;
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static ID id_div;
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static ID id_call;
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static ID id_size;
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#define id_each idEach
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#define id_eqq idEqq
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#define id_cmp idCmp
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#define id_lshift idLTLT
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VALUE
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rb_enum_values_pack(int argc, const VALUE *argv)
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{
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if (argc == 0) return Qnil;
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if (argc == 1) return argv[0];
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return rb_ary_new4(argc, argv);
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}
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#define ENUM_WANT_SVALUE() do { \
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i = rb_enum_values_pack(argc, argv); \
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} while (0)
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#define enum_yield rb_yield_values2
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static VALUE
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grep_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
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{
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struct MEMO *memo = MEMO_CAST(args);
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ENUM_WANT_SVALUE();
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if (RTEST(rb_funcall(memo->v1, id_eqq, 1, i))) {
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rb_ary_push(memo->v2, i);
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}
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return Qnil;
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}
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static VALUE
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grep_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
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{
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struct MEMO *memo = MEMO_CAST(args);
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ENUM_WANT_SVALUE();
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if (RTEST(rb_funcall(memo->v1, id_eqq, 1, i))) {
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rb_ary_push(memo->v2, rb_yield(i));
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}
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return Qnil;
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}
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/*
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* call-seq:
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* enum.grep(pattern) -> array
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* enum.grep(pattern) { |obj| block } -> array
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*
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* Returns an array of every element in <i>enum</i> for which
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* <code>Pattern === element</code>. If the optional <em>block</em> is
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* supplied, each matching element is passed to it, and the block's
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* result is stored in the output array.
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*
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* (1..100).grep 38..44 #=> [38, 39, 40, 41, 42, 43, 44]
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* c = IO.constants
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* c.grep(/SEEK/) #=> [:SEEK_SET, :SEEK_CUR, :SEEK_END]
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* res = c.grep(/SEEK/) { |v| IO.const_get(v) }
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* res #=> [0, 1, 2]
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*
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*/
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static VALUE
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enum_grep(VALUE obj, VALUE pat)
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{
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VALUE ary = rb_ary_new();
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struct MEMO *memo = MEMO_NEW(pat, ary, 0);
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rb_block_call(obj, id_each, 0, 0, rb_block_given_p() ? grep_iter_i : grep_i, (VALUE)memo);
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return ary;
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}
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static VALUE
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count_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
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{
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struct MEMO *memo = MEMO_CAST(memop);
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ENUM_WANT_SVALUE();
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if (rb_equal(i, memo->v1)) {
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memo->u3.cnt++;
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}
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return Qnil;
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}
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static VALUE
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count_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
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{
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struct MEMO *memo = MEMO_CAST(memop);
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if (RTEST(enum_yield(argc, argv))) {
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memo->u3.cnt++;
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}
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return Qnil;
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}
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static VALUE
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count_all_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
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{
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struct MEMO *memo = MEMO_CAST(memop);
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memo->u3.cnt++;
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return Qnil;
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}
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/*
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* call-seq:
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* enum.count -> int
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* enum.count(item) -> int
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* enum.count { |obj| block } -> int
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*
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* Returns the number of items in +enum+ through enumeration.
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* If an argument is given, the number of items in +enum+ that
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* are equal to +item+ are counted. If a block is given, it
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* counts the number of elements yielding a true value.
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*
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* ary = [1, 2, 4, 2]
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* ary.count #=> 4
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* ary.count(2) #=> 2
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* ary.count{ |x| x%2==0 } #=> 3
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*
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*/
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static VALUE
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enum_count(int argc, VALUE *argv, VALUE obj)
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{
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VALUE item = Qnil;
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struct MEMO *memo;
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rb_block_call_func *func;
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if (argc == 0) {
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if (rb_block_given_p()) {
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func = count_iter_i;
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}
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else {
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func = count_all_i;
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}
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}
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else {
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rb_scan_args(argc, argv, "1", &item);
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if (rb_block_given_p()) {
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rb_warn("given block not used");
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}
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func = count_i;
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}
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memo = MEMO_NEW(item, 0, 0);
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rb_block_call(obj, id_each, 0, 0, func, (VALUE)memo);
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return INT2NUM(memo->u3.cnt);
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}
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static VALUE
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find_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
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{
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ENUM_WANT_SVALUE();
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if (RTEST(rb_yield(i))) {
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struct MEMO *memo = MEMO_CAST(memop);
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MEMO_V1_SET(memo, i);
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memo->u3.cnt = 1;
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rb_iter_break();
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}
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return Qnil;
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}
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/*
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* call-seq:
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* enum.detect(ifnone = nil) { |obj| block } -> obj or nil
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* enum.find(ifnone = nil) { |obj| block } -> obj or nil
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* enum.detect(ifnone = nil) -> an_enumerator
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* enum.find(ifnone = nil) -> an_enumerator
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*
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* Passes each entry in <i>enum</i> to <em>block</em>. Returns the
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* first for which <em>block</em> is not false. If no
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* object matches, calls <i>ifnone</i> and returns its result when it
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* is specified, or returns <code>nil</code> otherwise.
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*
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* If no block is given, an enumerator is returned instead.
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*
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* (1..10).detect { |i| i % 5 == 0 and i % 7 == 0 } #=> nil
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* (1..100).find { |i| i % 5 == 0 and i % 7 == 0 } #=> 35
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*
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*/
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static VALUE
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enum_find(int argc, VALUE *argv, VALUE obj)
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{
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struct MEMO *memo;
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VALUE if_none;
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rb_scan_args(argc, argv, "01", &if_none);
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RETURN_ENUMERATOR(obj, argc, argv);
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memo = MEMO_NEW(Qundef, 0, 0);
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rb_block_call(obj, id_each, 0, 0, find_i, (VALUE)memo);
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if (memo->u3.cnt) {
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return memo->v1;
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}
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if (!NIL_P(if_none)) {
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return rb_funcallv(if_none, id_call, 0, 0);
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}
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return Qnil;
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}
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static VALUE
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find_index_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
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{
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struct MEMO *memo = MEMO_CAST(memop);
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ENUM_WANT_SVALUE();
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if (rb_equal(i, memo->v2)) {
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MEMO_V1_SET(memo, UINT2NUM(memo->u3.cnt));
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rb_iter_break();
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}
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memo->u3.cnt++;
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return Qnil;
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}
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static VALUE
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find_index_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memop))
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{
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struct MEMO *memo = MEMO_CAST(memop);
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if (RTEST(enum_yield(argc, argv))) {
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MEMO_V1_SET(memo, UINT2NUM(memo->u3.cnt));
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rb_iter_break();
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}
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memo->u3.cnt++;
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return Qnil;
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}
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/*
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* call-seq:
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* enum.find_index(value) -> int or nil
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* enum.find_index { |obj| block } -> int or nil
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* enum.find_index -> an_enumerator
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*
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* Compares each entry in <i>enum</i> with <em>value</em> or passes
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* to <em>block</em>. Returns the index for the first for which the
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* evaluated value is non-false. If no object matches, returns
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* <code>nil</code>
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*
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* If neither block nor argument is given, an enumerator is returned instead.
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*
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* (1..10).find_index { |i| i % 5 == 0 and i % 7 == 0 } #=> nil
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* (1..100).find_index { |i| i % 5 == 0 and i % 7 == 0 } #=> 34
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* (1..100).find_index(50) #=> 49
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*
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*/
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static VALUE
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enum_find_index(int argc, VALUE *argv, VALUE obj)
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{
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struct MEMO *memo; /* [return value, current index, ] */
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VALUE condition_value = Qnil;
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rb_block_call_func *func;
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if (argc == 0) {
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RETURN_ENUMERATOR(obj, 0, 0);
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func = find_index_iter_i;
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}
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else {
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rb_scan_args(argc, argv, "1", &condition_value);
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if (rb_block_given_p()) {
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rb_warn("given block not used");
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}
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func = find_index_i;
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}
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memo = MEMO_NEW(Qnil, condition_value, 0);
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rb_block_call(obj, id_each, 0, 0, func, (VALUE)memo);
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return memo->v1;
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}
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static VALUE
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find_all_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
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{
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ENUM_WANT_SVALUE();
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if (RTEST(rb_yield(i))) {
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rb_ary_push(ary, i);
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}
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return Qnil;
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}
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static VALUE
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enum_size(VALUE self, VALUE args, VALUE eobj)
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{
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VALUE r;
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r = rb_check_funcall(self, id_size, 0, 0);
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return (r == Qundef) ? Qnil : r;
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}
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static long
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limit_by_enum_size(VALUE obj, long n)
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{
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unsigned long limit;
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VALUE size = rb_check_funcall(obj, id_size, 0, 0);
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if (!FIXNUM_P(size)) return n;
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limit = FIX2ULONG(size);
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return ((unsigned long)n > limit) ? (long)limit : n;
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}
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static int
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enum_size_over_p(VALUE obj, long n)
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{
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VALUE size = rb_check_funcall(obj, id_size, 0, 0);
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if (!FIXNUM_P(size)) return 0;
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return ((unsigned long)n > FIX2ULONG(size));
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}
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/*
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* call-seq:
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* enum.find_all { |obj| block } -> array
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* enum.select { |obj| block } -> array
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* enum.find_all -> an_enumerator
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* enum.select -> an_enumerator
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*
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* Returns an array containing all elements of +enum+
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* for which the given +block+ returns a true value.
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*
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* If no block is given, an Enumerator is returned instead.
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*
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*
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* (1..10).find_all { |i| i % 3 == 0 } #=> [3, 6, 9]
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*
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* [1,2,3,4,5].select { |num| num.even? } #=> [2, 4]
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*
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* See also Enumerable#reject.
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*/
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static VALUE
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enum_find_all(VALUE obj)
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{
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VALUE ary;
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RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
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ary = rb_ary_new();
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rb_block_call(obj, id_each, 0, 0, find_all_i, ary);
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return ary;
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}
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static VALUE
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reject_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
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{
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ENUM_WANT_SVALUE();
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if (!RTEST(rb_yield(i))) {
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rb_ary_push(ary, i);
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}
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return Qnil;
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}
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/*
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* call-seq:
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* enum.reject { |obj| block } -> array
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* enum.reject -> an_enumerator
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*
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* Returns an array for all elements of +enum+ for which the given
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* +block+ returns false.
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*
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* If no block is given, an Enumerator is returned instead.
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*
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* (1..10).reject { |i| i % 3 == 0 } #=> [1, 2, 4, 5, 7, 8, 10]
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*
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* [1, 2, 3, 4, 5].reject { |num| num.even? } #=> [1, 3, 5]
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*
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* See also Enumerable#find_all.
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*/
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static VALUE
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enum_reject(VALUE obj)
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{
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VALUE ary;
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RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
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ary = rb_ary_new();
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rb_block_call(obj, id_each, 0, 0, reject_i, ary);
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return ary;
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}
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static VALUE
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collect_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
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{
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rb_ary_push(ary, enum_yield(argc, argv));
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return Qnil;
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}
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static VALUE
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collect_all(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
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{
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rb_thread_check_ints();
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rb_ary_push(ary, rb_enum_values_pack(argc, argv));
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return Qnil;
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}
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/*
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* call-seq:
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* enum.collect { |obj| block } -> array
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* enum.map { |obj| block } -> array
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* enum.collect -> an_enumerator
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* enum.map -> an_enumerator
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*
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* Returns a new array with the results of running <em>block</em> once
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* for every element in <i>enum</i>.
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*
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* If no block is given, an enumerator is returned instead.
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*
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* (1..4).map { |i| i*i } #=> [1, 4, 9, 16]
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* (1..4).collect { "cat" } #=> ["cat", "cat", "cat", "cat"]
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*
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*/
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static VALUE
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enum_collect(VALUE obj)
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{
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VALUE ary;
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RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
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ary = rb_ary_new();
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rb_block_call(obj, id_each, 0, 0, collect_i, ary);
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return ary;
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}
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static VALUE
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flat_map_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
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{
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VALUE tmp;
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i = enum_yield(argc, argv);
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tmp = rb_check_array_type(i);
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if (NIL_P(tmp)) {
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rb_ary_push(ary, i);
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}
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else {
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rb_ary_concat(ary, tmp);
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}
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return Qnil;
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}
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/*
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* call-seq:
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* enum.flat_map { |obj| block } -> array
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* enum.collect_concat { |obj| block } -> array
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* enum.flat_map -> an_enumerator
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* enum.collect_concat -> an_enumerator
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*
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* Returns a new array with the concatenated results of running
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* <em>block</em> once for every element in <i>enum</i>.
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*
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* If no block is given, an enumerator is returned instead.
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*
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* [1, 2, 3, 4].flat_map { |e| [e, -e] } #=> [1, -1, 2, -2, 3, -3, 4, -4]
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* [[1, 2], [3, 4]].flat_map { |e| e + [100] } #=> [1, 2, 100, 3, 4, 100]
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*
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*/
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static VALUE
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enum_flat_map(VALUE obj)
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{
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VALUE ary;
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RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
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ary = rb_ary_new();
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rb_block_call(obj, id_each, 0, 0, flat_map_i, ary);
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return ary;
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}
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/*
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* call-seq:
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* enum.to_a(*args) -> array
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* enum.entries(*args) -> array
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*
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* Returns an array containing the items in <i>enum</i>.
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*
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* (1..7).to_a #=> [1, 2, 3, 4, 5, 6, 7]
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* { 'a'=>1, 'b'=>2, 'c'=>3 }.to_a #=> [["a", 1], ["b", 2], ["c", 3]]
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*
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* require 'prime'
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* Prime.entries 10 #=> [2, 3, 5, 7]
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*/
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static VALUE
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enum_to_a(int argc, VALUE *argv, VALUE obj)
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{
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VALUE ary = rb_ary_new();
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rb_block_call(obj, id_each, argc, argv, collect_all, ary);
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OBJ_INFECT(ary, obj);
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return ary;
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}
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static VALUE
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enum_to_h_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
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{
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VALUE key_value_pair;
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ENUM_WANT_SVALUE();
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rb_thread_check_ints();
|
|
key_value_pair = rb_check_array_type(i);
|
|
if (NIL_P(key_value_pair)) {
|
|
rb_raise(rb_eTypeError, "wrong element type %s (expected array)",
|
|
rb_builtin_class_name(i));
|
|
}
|
|
if (RARRAY_LEN(key_value_pair) != 2) {
|
|
rb_raise(rb_eArgError, "element has wrong array length (expected 2, was %ld)",
|
|
RARRAY_LEN(key_value_pair));
|
|
}
|
|
rb_hash_aset(hash, RARRAY_AREF(key_value_pair, 0), RARRAY_AREF(key_value_pair, 1));
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.to_h(*args) -> hash
|
|
*
|
|
* Returns the result of interpreting <i>enum</i> as a list of
|
|
* <tt>[key, value]</tt> pairs.
|
|
*
|
|
* %i[hello world].each_with_index.to_h
|
|
* # => {:hello => 0, :world => 1}
|
|
*/
|
|
|
|
static VALUE
|
|
enum_to_h(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
VALUE hash = rb_hash_new();
|
|
rb_block_call(obj, id_each, argc, argv, enum_to_h_i, hash);
|
|
OBJ_INFECT(hash, obj);
|
|
return hash;
|
|
}
|
|
|
|
static VALUE
|
|
inject_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, p))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(p);
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
else {
|
|
MEMO_V1_SET(memo, rb_yield_values(2, memo->v1, i));
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
inject_op_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, p))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(p);
|
|
VALUE name;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
else if (SYMBOL_P(name = memo->u3.value)) {
|
|
const ID mid = SYM2ID(name);
|
|
MEMO_V1_SET(memo, rb_funcall(memo->v1, mid, 1, i));
|
|
}
|
|
else {
|
|
VALUE args[2];
|
|
args[0] = name;
|
|
args[1] = i;
|
|
MEMO_V1_SET(memo, rb_f_send(numberof(args), args, memo->v1));
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.inject(initial, sym) -> obj
|
|
* enum.inject(sym) -> obj
|
|
* enum.inject(initial) { |memo, obj| block } -> obj
|
|
* enum.inject { |memo, obj| block } -> obj
|
|
* enum.reduce(initial, sym) -> obj
|
|
* enum.reduce(sym) -> obj
|
|
* enum.reduce(initial) { |memo, obj| block } -> obj
|
|
* enum.reduce { |memo, obj| block } -> obj
|
|
*
|
|
* Combines all elements of <i>enum</i> by applying a binary
|
|
* operation, specified by a block or a symbol that names a
|
|
* method or operator.
|
|
*
|
|
* If you specify a block, then for each element in <i>enum</i>
|
|
* the block is passed an accumulator value (<i>memo</i>) and the element.
|
|
* If you specify a symbol instead, then each element in the collection
|
|
* will be passed to the named method of <i>memo</i>.
|
|
* In either case, the result becomes the new value for <i>memo</i>.
|
|
* At the end of the iteration, the final value of <i>memo</i> is the
|
|
* return value for the method.
|
|
*
|
|
* If you do not explicitly specify an <i>initial</i> value for <i>memo</i>,
|
|
* then the first element of collection is used as the initial value
|
|
* of <i>memo</i>.
|
|
*
|
|
*
|
|
* # Sum some numbers
|
|
* (5..10).reduce(:+) #=> 45
|
|
* # Same using a block and inject
|
|
* (5..10).inject { |sum, n| sum + n } #=> 45
|
|
* # Multiply some numbers
|
|
* (5..10).reduce(1, :*) #=> 151200
|
|
* # Same using a block
|
|
* (5..10).inject(1) { |product, n| product * n } #=> 151200
|
|
* # find the longest word
|
|
* longest = %w{ cat sheep bear }.inject do |memo, word|
|
|
* memo.length > word.length ? memo : word
|
|
* end
|
|
* longest #=> "sheep"
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_inject(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
struct MEMO *memo;
|
|
VALUE init, op;
|
|
rb_block_call_func *iter = inject_i;
|
|
ID id;
|
|
|
|
switch (rb_scan_args(argc, argv, "02", &init, &op)) {
|
|
case 0:
|
|
init = Qundef;
|
|
break;
|
|
case 1:
|
|
if (rb_block_given_p()) {
|
|
break;
|
|
}
|
|
id = rb_check_id(&init);
|
|
op = id ? ID2SYM(id) : init;
|
|
init = Qundef;
|
|
iter = inject_op_i;
|
|
break;
|
|
case 2:
|
|
if (rb_block_given_p()) {
|
|
rb_warning("given block not used");
|
|
}
|
|
id = rb_check_id(&op);
|
|
if (id) op = ID2SYM(id);
|
|
iter = inject_op_i;
|
|
break;
|
|
}
|
|
memo = MEMO_NEW(init, Qnil, op);
|
|
rb_block_call(obj, id_each, 0, 0, iter, (VALUE)memo);
|
|
if (memo->v1 == Qundef) return Qnil;
|
|
return memo->v1;
|
|
}
|
|
|
|
static VALUE
|
|
partition_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, arys))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(arys);
|
|
VALUE ary;
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (RTEST(rb_yield(i))) {
|
|
ary = memo->v1;
|
|
}
|
|
else {
|
|
ary = memo->v2;
|
|
}
|
|
rb_ary_push(ary, i);
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.partition { |obj| block } -> [ true_array, false_array ]
|
|
* enum.partition -> an_enumerator
|
|
*
|
|
* Returns two arrays, the first containing the elements of
|
|
* <i>enum</i> for which the block evaluates to true, the second
|
|
* containing the rest.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* (1..6).partition { |v| v.even? } #=> [[2, 4, 6], [1, 3, 5]]
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_partition(VALUE obj)
|
|
{
|
|
struct MEMO *memo;
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
|
|
|
|
memo = MEMO_NEW(rb_ary_new(), rb_ary_new(), 0);
|
|
rb_block_call(obj, id_each, 0, 0, partition_i, (VALUE)memo);
|
|
|
|
return rb_assoc_new(memo->v1, memo->v2);
|
|
}
|
|
|
|
static VALUE
|
|
group_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, hash))
|
|
{
|
|
VALUE group;
|
|
VALUE values;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
group = rb_yield(i);
|
|
values = rb_hash_aref(hash, group);
|
|
if (!RB_TYPE_P(values, T_ARRAY)) {
|
|
values = rb_ary_new3(1, i);
|
|
rb_hash_aset(hash, group, values);
|
|
}
|
|
else {
|
|
rb_ary_push(values, i);
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.group_by { |obj| block } -> a_hash
|
|
* enum.group_by -> an_enumerator
|
|
*
|
|
* Groups the collection by result of the block. Returns a hash where the
|
|
* keys are the evaluated result from the block and the values are
|
|
* arrays of elements in the collection that correspond to the key.
|
|
*
|
|
* If no block is given an enumerator is returned.
|
|
*
|
|
* (1..6).group_by { |i| i%3 } #=> {0=>[3, 6], 1=>[1, 4], 2=>[2, 5]}
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_group_by(VALUE obj)
|
|
{
|
|
VALUE hash;
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
|
|
|
|
hash = rb_hash_new();
|
|
rb_block_call(obj, id_each, 0, 0, group_by_i, hash);
|
|
OBJ_INFECT(hash, obj);
|
|
|
|
return hash;
|
|
}
|
|
|
|
static VALUE
|
|
first_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, params))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(params);
|
|
ENUM_WANT_SVALUE();
|
|
|
|
MEMO_V1_SET(memo, i);
|
|
rb_iter_break();
|
|
|
|
UNREACHABLE;
|
|
}
|
|
|
|
static VALUE enum_take(VALUE obj, VALUE n);
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.first -> obj or nil
|
|
* enum.first(n) -> an_array
|
|
*
|
|
* Returns the first element, or the first +n+ elements, of the enumerable.
|
|
* If the enumerable is empty, the first form returns <code>nil</code>, and the
|
|
* second form returns an empty array.
|
|
*
|
|
* %w[foo bar baz].first #=> "foo"
|
|
* %w[foo bar baz].first(2) #=> ["foo", "bar"]
|
|
* %w[foo bar baz].first(10) #=> ["foo", "bar", "baz"]
|
|
* [].first #=> nil
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_first(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
struct MEMO *memo;
|
|
rb_check_arity(argc, 0, 1);
|
|
if (argc > 0) {
|
|
return enum_take(obj, argv[0]);
|
|
}
|
|
else {
|
|
memo = MEMO_NEW(Qnil, 0, 0);
|
|
rb_block_call(obj, id_each, 0, 0, first_i, (VALUE)memo);
|
|
return memo->v1;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.sort -> array
|
|
* enum.sort { |a, b| block } -> array
|
|
*
|
|
* Returns an array containing the items in <i>enum</i> sorted,
|
|
* either according to their own <code><=></code> method, or by using
|
|
* the results of the supplied block. The block should return -1, 0, or
|
|
* +1 depending on the comparison between <i>a</i> and <i>b</i>. As of
|
|
* Ruby 1.8, the method <code>Enumerable#sort_by</code> implements a
|
|
* built-in Schwartzian Transform, useful when key computation or
|
|
* comparison is expensive.
|
|
*
|
|
* %w(rhea kea flea).sort #=> ["flea", "kea", "rhea"]
|
|
* (1..10).sort { |a, b| b <=> a } #=> [10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
|
|
*/
|
|
|
|
static VALUE
|
|
enum_sort(VALUE obj)
|
|
{
|
|
return rb_ary_sort(enum_to_a(0, 0, obj));
|
|
}
|
|
|
|
#define SORT_BY_BUFSIZE 16
|
|
struct sort_by_data {
|
|
VALUE ary;
|
|
VALUE buf;
|
|
long n;
|
|
};
|
|
|
|
static VALUE
|
|
sort_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, _data))
|
|
{
|
|
struct sort_by_data *data = (struct sort_by_data *)&MEMO_CAST(_data)->v1;
|
|
VALUE ary = data->ary;
|
|
VALUE v;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
v = rb_yield(i);
|
|
|
|
if (RBASIC(ary)->klass) {
|
|
rb_raise(rb_eRuntimeError, "sort_by reentered");
|
|
}
|
|
if (RARRAY_LEN(data->buf) != SORT_BY_BUFSIZE*2) {
|
|
rb_raise(rb_eRuntimeError, "sort_by reentered");
|
|
}
|
|
|
|
RARRAY_ASET(data->buf, data->n*2, v);
|
|
RARRAY_ASET(data->buf, data->n*2+1, i);
|
|
data->n++;
|
|
if (data->n == SORT_BY_BUFSIZE) {
|
|
rb_ary_concat(ary, data->buf);
|
|
data->n = 0;
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
static int
|
|
sort_by_cmp(const void *ap, const void *bp, void *data)
|
|
{
|
|
VALUE a;
|
|
VALUE b;
|
|
VALUE ary = (VALUE)data;
|
|
|
|
if (RBASIC(ary)->klass) {
|
|
rb_raise(rb_eRuntimeError, "sort_by reentered");
|
|
}
|
|
|
|
a = *(VALUE *)ap;
|
|
b = *(VALUE *)bp;
|
|
|
|
return rb_cmpint(rb_funcall(a, id_cmp, 1, b), a, b);
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.sort_by { |obj| block } -> array
|
|
* enum.sort_by -> an_enumerator
|
|
*
|
|
* Sorts <i>enum</i> using a set of keys generated by mapping the
|
|
* values in <i>enum</i> through the given block.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* %w{apple pear fig}.sort_by { |word| word.length}
|
|
* #=> ["fig", "pear", "apple"]
|
|
*
|
|
* The current implementation of <code>sort_by</code> generates an
|
|
* array of tuples containing the original collection element and the
|
|
* mapped value. This makes <code>sort_by</code> fairly expensive when
|
|
* the keysets are simple.
|
|
*
|
|
* require 'benchmark'
|
|
*
|
|
* a = (1..100000).map { rand(100000) }
|
|
*
|
|
* Benchmark.bm(10) do |b|
|
|
* b.report("Sort") { a.sort }
|
|
* b.report("Sort by") { a.sort_by { |a| a } }
|
|
* end
|
|
*
|
|
* <em>produces:</em>
|
|
*
|
|
* user system total real
|
|
* Sort 0.180000 0.000000 0.180000 ( 0.175469)
|
|
* Sort by 1.980000 0.040000 2.020000 ( 2.013586)
|
|
*
|
|
* However, consider the case where comparing the keys is a non-trivial
|
|
* operation. The following code sorts some files on modification time
|
|
* using the basic <code>sort</code> method.
|
|
*
|
|
* files = Dir["*"]
|
|
* sorted = files.sort { |a, b| File.new(a).mtime <=> File.new(b).mtime }
|
|
* sorted #=> ["mon", "tues", "wed", "thurs"]
|
|
*
|
|
* This sort is inefficient: it generates two new <code>File</code>
|
|
* objects during every comparison. A slightly better technique is to
|
|
* use the <code>Kernel#test</code> method to generate the modification
|
|
* times directly.
|
|
*
|
|
* files = Dir["*"]
|
|
* sorted = files.sort { |a, b|
|
|
* test(?M, a) <=> test(?M, b)
|
|
* }
|
|
* sorted #=> ["mon", "tues", "wed", "thurs"]
|
|
*
|
|
* This still generates many unnecessary <code>Time</code> objects. A
|
|
* more efficient technique is to cache the sort keys (modification
|
|
* times in this case) before the sort. Perl users often call this
|
|
* approach a Schwartzian Transform, after Randal Schwartz. We
|
|
* construct a temporary array, where each element is an array
|
|
* containing our sort key along with the filename. We sort this array,
|
|
* and then extract the filename from the result.
|
|
*
|
|
* sorted = Dir["*"].collect { |f|
|
|
* [test(?M, f), f]
|
|
* }.sort.collect { |f| f[1] }
|
|
* sorted #=> ["mon", "tues", "wed", "thurs"]
|
|
*
|
|
* This is exactly what <code>sort_by</code> does internally.
|
|
*
|
|
* sorted = Dir["*"].sort_by { |f| test(?M, f) }
|
|
* sorted #=> ["mon", "tues", "wed", "thurs"]
|
|
*/
|
|
|
|
static VALUE
|
|
enum_sort_by(VALUE obj)
|
|
{
|
|
VALUE ary, buf;
|
|
struct MEMO *memo;
|
|
long i;
|
|
struct sort_by_data *data;
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
|
|
|
|
if (RB_TYPE_P(obj, T_ARRAY) && RARRAY_LEN(obj) <= LONG_MAX/2) {
|
|
ary = rb_ary_new2(RARRAY_LEN(obj)*2);
|
|
}
|
|
else {
|
|
ary = rb_ary_new();
|
|
}
|
|
RBASIC_CLEAR_CLASS(ary);
|
|
buf = rb_ary_tmp_new(SORT_BY_BUFSIZE*2);
|
|
rb_ary_store(buf, SORT_BY_BUFSIZE*2-1, Qnil);
|
|
memo = MEMO_NEW(0, 0, 0);
|
|
OBJ_INFECT(memo, obj);
|
|
data = (struct sort_by_data *)&memo->v1;
|
|
data->ary = ary;
|
|
data->buf = buf;
|
|
data->n = 0;
|
|
rb_block_call(obj, id_each, 0, 0, sort_by_i, (VALUE)memo);
|
|
ary = data->ary;
|
|
buf = data->buf;
|
|
if (data->n) {
|
|
rb_ary_resize(buf, data->n*2);
|
|
rb_ary_concat(ary, buf);
|
|
}
|
|
if (RARRAY_LEN(ary) > 2) {
|
|
RARRAY_PTR_USE(ary, ptr,
|
|
ruby_qsort(ptr, RARRAY_LEN(ary)/2, 2*sizeof(VALUE),
|
|
sort_by_cmp, (void *)ary));
|
|
}
|
|
if (RBASIC(ary)->klass) {
|
|
rb_raise(rb_eRuntimeError, "sort_by reentered");
|
|
}
|
|
for (i=1; i<RARRAY_LEN(ary); i+=2) {
|
|
RARRAY_ASET(ary, i/2, RARRAY_AREF(ary, i));
|
|
}
|
|
rb_ary_resize(ary, RARRAY_LEN(ary)/2);
|
|
RBASIC_SET_CLASS_RAW(ary, rb_cArray);
|
|
OBJ_INFECT(ary, memo);
|
|
|
|
return ary;
|
|
}
|
|
|
|
#define ENUMFUNC(name) rb_block_given_p() ? name##_iter_i : name##_i
|
|
|
|
#define DEFINE_ENUMFUNCS(name) \
|
|
static VALUE enum_##name##_func(VALUE result, struct MEMO *memo); \
|
|
\
|
|
static VALUE \
|
|
name##_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo)) \
|
|
{ \
|
|
return enum_##name##_func(rb_enum_values_pack(argc, argv), MEMO_CAST(memo)); \
|
|
} \
|
|
\
|
|
static VALUE \
|
|
name##_iter_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo)) \
|
|
{ \
|
|
return enum_##name##_func(enum_yield(argc, argv), MEMO_CAST(memo)); \
|
|
} \
|
|
\
|
|
static VALUE \
|
|
enum_##name##_func(VALUE result, struct MEMO *memo)
|
|
|
|
DEFINE_ENUMFUNCS(all)
|
|
{
|
|
if (!RTEST(result)) {
|
|
MEMO_V1_SET(memo, Qfalse);
|
|
rb_iter_break();
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.all? [{ |obj| block } ] -> true or false
|
|
*
|
|
* Passes each element of the collection to the given block. The method
|
|
* returns <code>true</code> if the block never returns
|
|
* <code>false</code> or <code>nil</code>. If the block is not given,
|
|
* Ruby adds an implicit block of <code>{ |obj| obj }</code> which will
|
|
* cause #all? to return +true+ when none of the collection members are
|
|
* +false+ or +nil+.
|
|
*
|
|
* %w[ant bear cat].all? { |word| word.length >= 3 } #=> true
|
|
* %w[ant bear cat].all? { |word| word.length >= 4 } #=> false
|
|
* [nil, true, 99].all? #=> false
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_all(VALUE obj)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(Qtrue, 0, 0);
|
|
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(all), (VALUE)memo);
|
|
return memo->v1;
|
|
}
|
|
|
|
DEFINE_ENUMFUNCS(any)
|
|
{
|
|
if (RTEST(result)) {
|
|
MEMO_V1_SET(memo, Qtrue);
|
|
rb_iter_break();
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.any? [{ |obj| block }] -> true or false
|
|
*
|
|
* Passes each element of the collection to the given block. The method
|
|
* returns <code>true</code> if the block ever returns a value other
|
|
* than <code>false</code> or <code>nil</code>. If the block is not
|
|
* given, Ruby adds an implicit block of <code>{ |obj| obj }</code> that
|
|
* will cause #any? to return +true+ if at least one of the collection
|
|
* members is not +false+ or +nil+.
|
|
*
|
|
* %w[ant bear cat].any? { |word| word.length >= 3 } #=> true
|
|
* %w[ant bear cat].any? { |word| word.length >= 4 } #=> true
|
|
* [nil, true, 99].any? #=> true
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_any(VALUE obj)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(Qfalse, 0, 0);
|
|
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(any), (VALUE)memo);
|
|
return memo->v1;
|
|
}
|
|
|
|
DEFINE_ENUMFUNCS(one)
|
|
{
|
|
if (RTEST(result)) {
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, Qtrue);
|
|
}
|
|
else if (memo->v1 == Qtrue) {
|
|
MEMO_V1_SET(memo, Qfalse);
|
|
rb_iter_break();
|
|
}
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
struct nmin_data {
|
|
long n;
|
|
long bufmax;
|
|
long curlen;
|
|
VALUE buf;
|
|
VALUE limit;
|
|
int (*cmpfunc)(const void *, const void *, void *);
|
|
int rev; /* max if 1 */
|
|
int by; /* min_by if 1 */
|
|
const char *method;
|
|
};
|
|
|
|
static int
|
|
nmin_cmp(const void *ap, const void *bp, void *_data)
|
|
{
|
|
struct nmin_data *data = (struct nmin_data *)_data;
|
|
VALUE a = *(const VALUE *)ap, b = *(const VALUE *)bp;
|
|
VALUE cmp = rb_funcall(a, id_cmp, 1, b);
|
|
if (RBASIC(data->buf)->klass) {
|
|
rb_raise(rb_eRuntimeError, "%s reentered", data->method);
|
|
}
|
|
return rb_cmpint(cmp, a, b);
|
|
}
|
|
|
|
static int
|
|
nmin_block_cmp(const void *ap, const void *bp, void *_data)
|
|
{
|
|
struct nmin_data *data = (struct nmin_data *)_data;
|
|
VALUE a = *(const VALUE *)ap, b = *(const VALUE *)bp;
|
|
VALUE cmp = rb_yield_values(2, a, b);
|
|
if (RBASIC(data->buf)->klass) {
|
|
rb_raise(rb_eRuntimeError, "%s reentered", data->method);
|
|
}
|
|
return rb_cmpint(cmp, a, b);
|
|
}
|
|
|
|
|
|
static void
|
|
nmin_filter(struct nmin_data *data)
|
|
{
|
|
long n;
|
|
VALUE *beg;
|
|
int eltsize;
|
|
long numelts;
|
|
|
|
long left, right;
|
|
|
|
long i, j;
|
|
|
|
if (data->curlen <= data->n)
|
|
return;
|
|
|
|
n = data->n;
|
|
beg = RARRAY_PTR(data->buf);
|
|
eltsize = data->by ? 2 : 1;
|
|
numelts = data->curlen;
|
|
|
|
left = 0;
|
|
right = numelts-1;
|
|
|
|
#define GETPTR(i) (beg+(i)*eltsize)
|
|
|
|
#define SWAP(i, j) do { \
|
|
VALUE tmp[2]; \
|
|
memcpy(tmp, GETPTR(i), sizeof(VALUE)*eltsize); \
|
|
memcpy(GETPTR(i), GETPTR(j), sizeof(VALUE)*eltsize); \
|
|
memcpy(GETPTR(j), tmp, sizeof(VALUE)*eltsize); \
|
|
} while (0)
|
|
|
|
while (1) {
|
|
long pivot_index = left + (right-left)/2;
|
|
long store_index;
|
|
long num_pivots = 1;
|
|
|
|
SWAP(pivot_index, right);
|
|
pivot_index = right;
|
|
|
|
store_index = left;
|
|
i = left;
|
|
while (i <= right-num_pivots) {
|
|
int c = data->cmpfunc(GETPTR(i), GETPTR(pivot_index), data);
|
|
if (data->rev)
|
|
c = -c;
|
|
if (c == 0) {
|
|
SWAP(i, right-num_pivots);
|
|
num_pivots++;
|
|
continue;
|
|
}
|
|
if (c < 0) {
|
|
SWAP(i, store_index);
|
|
store_index++;
|
|
}
|
|
i++;
|
|
}
|
|
j = store_index;
|
|
for (i = right; right-num_pivots < i; i--) {
|
|
if (i <= j)
|
|
break;
|
|
SWAP(j, i);
|
|
j++;
|
|
}
|
|
|
|
if (store_index <= n && n <= store_index+num_pivots)
|
|
break;
|
|
|
|
if (n < store_index) {
|
|
right = store_index-1;
|
|
}
|
|
else {
|
|
left = store_index+num_pivots;
|
|
}
|
|
}
|
|
#undef GETPTR
|
|
#undef SWAP
|
|
|
|
data->curlen = data->n;
|
|
rb_ary_resize(data->buf, data->n * eltsize);
|
|
data->limit = RARRAY_PTR(data->buf)[(data->n-1)*eltsize];
|
|
}
|
|
|
|
static VALUE
|
|
nmin_i(VALUE i, VALUE *_data, int argc, VALUE *argv)
|
|
{
|
|
struct nmin_data *data = (struct nmin_data *)_data;
|
|
VALUE cmpv;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (data->by)
|
|
cmpv = rb_yield(i);
|
|
else
|
|
cmpv = i;
|
|
|
|
if (data->limit != Qundef) {
|
|
int c = data->cmpfunc(&cmpv, &data->limit, data);
|
|
if (data->rev)
|
|
c = -c;
|
|
if (c > 0)
|
|
return Qnil;
|
|
}
|
|
|
|
if (data->by)
|
|
rb_ary_push(data->buf, cmpv);
|
|
rb_ary_push(data->buf, i);
|
|
|
|
data->curlen++;
|
|
|
|
if (data->curlen == data->bufmax) {
|
|
nmin_filter(data);
|
|
}
|
|
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
nmin_run(VALUE obj, VALUE num, int by, int rev)
|
|
{
|
|
VALUE result;
|
|
struct nmin_data data;
|
|
|
|
data.n = NUM2LONG(num);
|
|
if (data.n < 0)
|
|
rb_raise(rb_eArgError, "negative size (%ld)", data.n);
|
|
if (data.n == 0)
|
|
return rb_ary_new2(0);
|
|
if (LONG_MAX/4/(by ? 2 : 1) < data.n)
|
|
rb_raise(rb_eArgError, "too big size");
|
|
data.bufmax = data.n * 4;
|
|
data.curlen = 0;
|
|
data.buf = rb_ary_tmp_new(data.bufmax * (by ? 2 : 1));
|
|
data.limit = Qundef;
|
|
data.cmpfunc = by ? nmin_cmp :
|
|
rb_block_given_p() ? nmin_block_cmp :
|
|
nmin_cmp;
|
|
data.rev = rev;
|
|
data.by = by;
|
|
data.method = rev ? (by ? "max_by" : "max")
|
|
: (by ? "min_by" : "min");
|
|
rb_block_call(obj, id_each, 0, 0, nmin_i, (VALUE)&data);
|
|
nmin_filter(&data);
|
|
result = data.buf;
|
|
if (by) {
|
|
long i;
|
|
ruby_qsort(RARRAY_PTR(result),
|
|
RARRAY_LEN(result)/2,
|
|
sizeof(VALUE)*2,
|
|
data.cmpfunc, (void *)&data);
|
|
for (i=1; i<RARRAY_LEN(result); i+=2) {
|
|
RARRAY_PTR(result)[i/2] = RARRAY_PTR(result)[i];
|
|
}
|
|
rb_ary_resize(result, RARRAY_LEN(result)/2);
|
|
}
|
|
else {
|
|
ruby_qsort(RARRAY_PTR(result), RARRAY_LEN(result), sizeof(VALUE),
|
|
data.cmpfunc, (void *)&data);
|
|
}
|
|
if (rev) {
|
|
rb_ary_reverse(result);
|
|
}
|
|
*((VALUE *)&RBASIC(result)->klass) = rb_cArray;
|
|
return result;
|
|
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.one? [{ |obj| block }] -> true or false
|
|
*
|
|
* Passes each element of the collection to the given block. The method
|
|
* returns <code>true</code> if the block returns <code>true</code>
|
|
* exactly once. If the block is not given, <code>one?</code> will return
|
|
* <code>true</code> only if exactly one of the collection members is
|
|
* true.
|
|
*
|
|
* %w{ant bear cat}.one? { |word| word.length == 4 } #=> true
|
|
* %w{ant bear cat}.one? { |word| word.length > 4 } #=> false
|
|
* %w{ant bear cat}.one? { |word| word.length < 4 } #=> false
|
|
* [ nil, true, 99 ].one? #=> false
|
|
* [ nil, true, false ].one? #=> true
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_one(VALUE obj)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(Qundef, 0, 0);
|
|
VALUE result;
|
|
|
|
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(one), (VALUE)memo);
|
|
result = memo->v1;
|
|
if (result == Qundef) return Qfalse;
|
|
return result;
|
|
}
|
|
|
|
DEFINE_ENUMFUNCS(none)
|
|
{
|
|
if (RTEST(result)) {
|
|
MEMO_V1_SET(memo, Qfalse);
|
|
rb_iter_break();
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.none? [{ |obj| block }] -> true or false
|
|
*
|
|
* Passes each element of the collection to the given block. The method
|
|
* returns <code>true</code> if the block never returns <code>true</code>
|
|
* for all elements. If the block is not given, <code>none?</code> will return
|
|
* <code>true</code> only if none of the collection members is true.
|
|
*
|
|
* %w{ant bear cat}.none? { |word| word.length == 5 } #=> true
|
|
* %w{ant bear cat}.none? { |word| word.length >= 4 } #=> false
|
|
* [].none? #=> true
|
|
* [nil].none? #=> true
|
|
* [nil, false].none? #=> true
|
|
*/
|
|
static VALUE
|
|
enum_none(VALUE obj)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(Qtrue, 0, 0);
|
|
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(none), (VALUE)memo);
|
|
return memo->v1;
|
|
}
|
|
|
|
static VALUE
|
|
min_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
VALUE cmp;
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
else {
|
|
cmp = rb_funcall(i, id_cmp, 1, memo->v1);
|
|
if (rb_cmpint(cmp, i, memo->v1) < 0) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
min_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
VALUE cmp;
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
else {
|
|
cmp = rb_yield_values(2, i, memo->v1);
|
|
if (rb_cmpint(cmp, i, memo->v1) < 0) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.min -> obj
|
|
* enum.min {| a,b | block } -> obj
|
|
* enum.min(n) -> array
|
|
* enum.min(n) {| a,b | block } -> array
|
|
*
|
|
* Returns the object in <i>enum</i> with the minimum value. The
|
|
* first form assumes all objects implement <code>Comparable</code>;
|
|
* the second uses the block to return <em>a <=> b</em>.
|
|
*
|
|
* a = %w(albatross dog horse)
|
|
* a.min #=> "albatross"
|
|
* a.min { |a, b| a.length <=> b.length } #=> "dog"
|
|
*
|
|
* If the +n+ argument is given, minimum +n+ elements are returned
|
|
* as an array.
|
|
*
|
|
* a = %w[albatross dog horse]
|
|
* a.min(2) #=> ["albatross", "dog"]
|
|
* a.min(2) {|a, b| a.length <=> b.length } #=> ["dog", "horse"]
|
|
*/
|
|
|
|
static VALUE
|
|
enum_min(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(Qundef, 0, 0);
|
|
VALUE result;
|
|
VALUE num;
|
|
|
|
rb_scan_args(argc, argv, "01", &num);
|
|
|
|
if (!NIL_P(num))
|
|
return nmin_run(obj, num, 0, 0);
|
|
|
|
if (rb_block_given_p()) {
|
|
rb_block_call(obj, id_each, 0, 0, min_ii, (VALUE)memo);
|
|
}
|
|
else {
|
|
rb_block_call(obj, id_each, 0, 0, min_i, (VALUE)memo);
|
|
}
|
|
result = memo->v1;
|
|
if (result == Qundef) return Qnil;
|
|
return result;
|
|
}
|
|
|
|
static VALUE
|
|
max_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
VALUE cmp;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
else {
|
|
cmp = rb_funcall(i, id_cmp, 1, memo->v1);
|
|
if (rb_cmpint(cmp, i, memo->v1) > 0) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
max_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
VALUE cmp;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
else {
|
|
cmp = rb_yield_values(2, i, memo->v1);
|
|
if (rb_cmpint(cmp, i, memo->v1) > 0) {
|
|
MEMO_V1_SET(memo, i);
|
|
}
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.max -> obj
|
|
* enum.max { |a, b| block } -> obj
|
|
* enum.max(n) -> obj
|
|
* enum.max(n) {|a,b| block } -> obj
|
|
*
|
|
* Returns the object in _enum_ with the maximum value. The
|
|
* first form assumes all objects implement <code>Comparable</code>;
|
|
* the second uses the block to return <em>a <=> b</em>.
|
|
*
|
|
* a = %w(albatross dog horse)
|
|
* a.max #=> "horse"
|
|
* a.max { |a, b| a.length <=> b.length } #=> "albatross"
|
|
*
|
|
* If the +n+ argument is given, maximum +n+ elements are returned
|
|
* as an array.
|
|
*
|
|
* a = %w[albatross dog horse]
|
|
* a.max(2) #=> ["horse", "dog"]
|
|
* a.max(2) {|a, b| a.length <=> b.length } #=> ["albatross", "horse"]
|
|
*/
|
|
|
|
static VALUE
|
|
enum_max(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(Qundef, 0, 0);
|
|
VALUE result;
|
|
VALUE num;
|
|
|
|
rb_scan_args(argc, argv, "01", &num);
|
|
|
|
if (!NIL_P(num))
|
|
return nmin_run(obj, num, 0, 1);
|
|
|
|
if (rb_block_given_p()) {
|
|
rb_block_call(obj, id_each, 0, 0, max_ii, (VALUE)memo);
|
|
}
|
|
else {
|
|
rb_block_call(obj, id_each, 0, 0, max_i, (VALUE)memo);
|
|
}
|
|
result = memo->v1;
|
|
if (result == Qundef) return Qnil;
|
|
return result;
|
|
}
|
|
|
|
struct minmax_t {
|
|
VALUE min;
|
|
VALUE max;
|
|
VALUE last;
|
|
};
|
|
|
|
STATIC_ASSERT(minmax_t, sizeof(struct minmax_t) <= sizeof(struct MEMO) - offsetof(struct MEMO, v1));
|
|
|
|
static void
|
|
minmax_i_update(VALUE i, VALUE j, struct minmax_t *memo)
|
|
{
|
|
int n;
|
|
|
|
if (memo->min == Qundef) {
|
|
memo->min = i;
|
|
memo->max = j;
|
|
}
|
|
else {
|
|
n = rb_cmpint(rb_funcall(i, id_cmp, 1, memo->min), i, memo->min);
|
|
if (n < 0) {
|
|
memo->min = i;
|
|
}
|
|
n = rb_cmpint(rb_funcall(j, id_cmp, 1, memo->max), j, memo->max);
|
|
if (n > 0) {
|
|
memo->max = j;
|
|
}
|
|
}
|
|
}
|
|
|
|
static VALUE
|
|
minmax_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
|
|
{
|
|
struct minmax_t *memo = (struct minmax_t *)&MEMO_CAST(_memo)->v1;
|
|
int n;
|
|
VALUE j;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->last == Qundef) {
|
|
memo->last = i;
|
|
return Qnil;
|
|
}
|
|
j = memo->last;
|
|
memo->last = Qundef;
|
|
|
|
n = rb_cmpint(rb_funcall(j, id_cmp, 1, i), j, i);
|
|
if (n == 0)
|
|
i = j;
|
|
else if (n < 0) {
|
|
VALUE tmp;
|
|
tmp = i;
|
|
i = j;
|
|
j = tmp;
|
|
}
|
|
|
|
minmax_i_update(i, j, memo);
|
|
|
|
return Qnil;
|
|
}
|
|
|
|
static void
|
|
minmax_ii_update(VALUE i, VALUE j, struct minmax_t *memo)
|
|
{
|
|
int n;
|
|
|
|
if (memo->min == Qundef) {
|
|
memo->min = i;
|
|
memo->max = j;
|
|
}
|
|
else {
|
|
n = rb_cmpint(rb_yield_values(2, i, memo->min), i, memo->min);
|
|
if (n < 0) {
|
|
memo->min = i;
|
|
}
|
|
n = rb_cmpint(rb_yield_values(2, j, memo->max), j, memo->max);
|
|
if (n > 0) {
|
|
memo->max = j;
|
|
}
|
|
}
|
|
}
|
|
|
|
static VALUE
|
|
minmax_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
|
|
{
|
|
struct minmax_t *memo = (struct minmax_t *)&MEMO_CAST(_memo)->v1;
|
|
int n;
|
|
VALUE j;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->last == Qundef) {
|
|
memo->last = i;
|
|
return Qnil;
|
|
}
|
|
j = memo->last;
|
|
memo->last = Qundef;
|
|
|
|
n = rb_cmpint(rb_yield_values(2, j, i), j, i);
|
|
if (n == 0)
|
|
i = j;
|
|
else if (n < 0) {
|
|
VALUE tmp;
|
|
tmp = i;
|
|
i = j;
|
|
j = tmp;
|
|
}
|
|
|
|
minmax_ii_update(i, j, memo);
|
|
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.minmax -> [min, max]
|
|
* enum.minmax { |a, b| block } -> [min, max]
|
|
*
|
|
* Returns two elements array which contains the minimum and the
|
|
* maximum value in the enumerable. The first form assumes all
|
|
* objects implement <code>Comparable</code>; the second uses the
|
|
* block to return <em>a <=> b</em>.
|
|
*
|
|
* a = %w(albatross dog horse)
|
|
* a.minmax #=> ["albatross", "horse"]
|
|
* a.minmax { |a, b| a.length <=> b.length } #=> ["dog", "albatross"]
|
|
*/
|
|
|
|
static VALUE
|
|
enum_minmax(VALUE obj)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(Qundef, Qundef, Qundef);
|
|
struct minmax_t *m = (struct minmax_t *)&memo->v1;
|
|
VALUE ary = rb_ary_new3(2, Qnil, Qnil);
|
|
|
|
m->min = Qundef;
|
|
m->last = Qundef;
|
|
if (rb_block_given_p()) {
|
|
rb_block_call(obj, id_each, 0, 0, minmax_ii, (VALUE)memo);
|
|
if (m->last != Qundef)
|
|
minmax_ii_update(m->last, m->last, m);
|
|
}
|
|
else {
|
|
rb_block_call(obj, id_each, 0, 0, minmax_i, (VALUE)memo);
|
|
if (m->last != Qundef)
|
|
minmax_i_update(m->last, m->last, m);
|
|
}
|
|
if (m->min != Qundef) {
|
|
rb_ary_store(ary, 0, m->min);
|
|
rb_ary_store(ary, 1, m->max);
|
|
}
|
|
return ary;
|
|
}
|
|
|
|
static VALUE
|
|
min_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
VALUE v;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
v = rb_yield(i);
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, v);
|
|
MEMO_V2_SET(memo, i);
|
|
}
|
|
else if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo->v1), v, memo->v1) < 0) {
|
|
MEMO_V1_SET(memo, v);
|
|
MEMO_V2_SET(memo, i);
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.min_by {|obj| block } -> obj
|
|
* enum.min_by -> an_enumerator
|
|
* enum.min_by(n) {|obj| block } -> array
|
|
* enum.min_by(n) -> an_enumerator
|
|
*
|
|
* Returns the object in <i>enum</i> that gives the minimum
|
|
* value from the given block.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* a = %w(albatross dog horse)
|
|
* a.min_by { |x| x.length } #=> "dog"
|
|
*
|
|
* If the +n+ argument is given, minimum +n+ elements are returned
|
|
* as an array.
|
|
*
|
|
* a = %w[albatross dog horse]
|
|
* p a.min_by(2) {|x| x.length } #=> ["dog", "horse"]
|
|
*/
|
|
|
|
static VALUE
|
|
enum_min_by(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
struct MEMO *memo;
|
|
VALUE num;
|
|
|
|
rb_scan_args(argc, argv, "01", &num);
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
|
|
|
|
if (!NIL_P(num))
|
|
return nmin_run(obj, num, 1, 0);
|
|
|
|
memo = MEMO_NEW(Qundef, Qnil, 0);
|
|
rb_block_call(obj, id_each, 0, 0, min_by_i, (VALUE)memo);
|
|
return memo->v2;
|
|
}
|
|
|
|
static VALUE
|
|
max_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
VALUE v;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
v = rb_yield(i);
|
|
if (memo->v1 == Qundef) {
|
|
MEMO_V1_SET(memo, v);
|
|
MEMO_V2_SET(memo, i);
|
|
}
|
|
else if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo->v1), v, memo->v1) > 0) {
|
|
MEMO_V1_SET(memo, v);
|
|
MEMO_V2_SET(memo, i);
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.max_by {|obj| block } -> obj
|
|
* enum.max_by -> an_enumerator
|
|
* enum.max_by(n) {|obj| block } -> obj
|
|
* enum.max_by(n) -> an_enumerator
|
|
*
|
|
* Returns the object in <i>enum</i> that gives the maximum
|
|
* value from the given block.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* a = %w(albatross dog horse)
|
|
* a.max_by { |x| x.length } #=> "albatross"
|
|
*
|
|
* If the +n+ argument is given, minimum +n+ elements are returned
|
|
* as an array.
|
|
*
|
|
* a = %w[albatross dog horse]
|
|
* a.max_by(2) {|x| x.length } #=> ["albatross", "horse"]
|
|
*
|
|
* enum.max_by(n) can be used to implement weighted random sampling.
|
|
* Following example implements and use Enumerable#wsample.
|
|
*
|
|
* module Enumerable
|
|
* # weighted random sampling.
|
|
* #
|
|
* # Pavlos S. Efraimidis, Paul G. Spirakis
|
|
* # Weighted random sampling with a reservoir
|
|
* # Information Processing Letters
|
|
* # Volume 97, Issue 5 (16 March 2006)
|
|
* def wsample(n)
|
|
* self.max_by(n) {|v| rand ** (1.0/yield(v)) }
|
|
* end
|
|
* end
|
|
* e = (-20..20).to_a*10000
|
|
* a = e.wsample(20000) {|x|
|
|
* Math.exp(-(x/5.0)**2) # normal distribution
|
|
* }
|
|
* # a is 20000 samples from e.
|
|
* p a.length #=> 20000
|
|
* h = a.group_by {|x| x }
|
|
* -10.upto(10) {|x| puts "*" * (h[x].length/30.0).to_i if h[x] }
|
|
* #=> *
|
|
* # ***
|
|
* # ******
|
|
* # ***********
|
|
* # ******************
|
|
* # *****************************
|
|
* # *****************************************
|
|
* # ****************************************************
|
|
* # ***************************************************************
|
|
* # ********************************************************************
|
|
* # ***********************************************************************
|
|
* # ***********************************************************************
|
|
* # **************************************************************
|
|
* # ****************************************************
|
|
* # ***************************************
|
|
* # ***************************
|
|
* # ******************
|
|
* # ***********
|
|
* # *******
|
|
* # ***
|
|
* # *
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_max_by(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
struct MEMO *memo;
|
|
VALUE num;
|
|
|
|
rb_scan_args(argc, argv, "01", &num);
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
|
|
|
|
if (!NIL_P(num))
|
|
return nmin_run(obj, num, 1, 1);
|
|
|
|
memo = MEMO_NEW(Qundef, Qnil, 0);
|
|
rb_block_call(obj, id_each, 0, 0, max_by_i, (VALUE)memo);
|
|
return memo->v2;
|
|
}
|
|
|
|
struct minmax_by_t {
|
|
VALUE min_bv;
|
|
VALUE max_bv;
|
|
VALUE min;
|
|
VALUE max;
|
|
VALUE last_bv;
|
|
VALUE last;
|
|
};
|
|
|
|
static void
|
|
minmax_by_i_update(VALUE v1, VALUE v2, VALUE i1, VALUE i2, struct minmax_by_t *memo)
|
|
{
|
|
if (memo->min_bv == Qundef) {
|
|
memo->min_bv = v1;
|
|
memo->max_bv = v2;
|
|
memo->min = i1;
|
|
memo->max = i2;
|
|
}
|
|
else {
|
|
if (rb_cmpint(rb_funcall(v1, id_cmp, 1, memo->min_bv), v1, memo->min_bv) < 0) {
|
|
memo->min_bv = v1;
|
|
memo->min = i1;
|
|
}
|
|
if (rb_cmpint(rb_funcall(v2, id_cmp, 1, memo->max_bv), v2, memo->max_bv) > 0) {
|
|
memo->max_bv = v2;
|
|
memo->max = i2;
|
|
}
|
|
}
|
|
}
|
|
|
|
static VALUE
|
|
minmax_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
|
|
{
|
|
struct minmax_by_t *memo = MEMO_FOR(struct minmax_by_t, _memo);
|
|
VALUE vi, vj, j;
|
|
int n;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
vi = rb_yield(i);
|
|
|
|
if (memo->last_bv == Qundef) {
|
|
memo->last_bv = vi;
|
|
memo->last = i;
|
|
return Qnil;
|
|
}
|
|
vj = memo->last_bv;
|
|
j = memo->last;
|
|
memo->last_bv = Qundef;
|
|
|
|
n = rb_cmpint(rb_funcall(vj, id_cmp, 1, vi), vj, vi);
|
|
if (n == 0) {
|
|
i = j;
|
|
vi = vj;
|
|
}
|
|
else if (n < 0) {
|
|
VALUE tmp;
|
|
tmp = i;
|
|
i = j;
|
|
j = tmp;
|
|
tmp = vi;
|
|
vi = vj;
|
|
vj = tmp;
|
|
}
|
|
|
|
minmax_by_i_update(vi, vj, i, j, memo);
|
|
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.minmax_by { |obj| block } -> [min, max]
|
|
* enum.minmax_by -> an_enumerator
|
|
*
|
|
* Returns a two element array containing the objects in
|
|
* <i>enum</i> that correspond to the minimum and maximum values respectively
|
|
* from the given block.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* a = %w(albatross dog horse)
|
|
* a.minmax_by { |x| x.length } #=> ["dog", "albatross"]
|
|
*/
|
|
|
|
static VALUE
|
|
enum_minmax_by(VALUE obj)
|
|
{
|
|
VALUE memo;
|
|
struct minmax_by_t *m = NEW_MEMO_FOR(struct minmax_by_t, memo);
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, 0, 0, enum_size);
|
|
|
|
m->min_bv = Qundef;
|
|
m->max_bv = Qundef;
|
|
m->min = Qnil;
|
|
m->max = Qnil;
|
|
m->last_bv = Qundef;
|
|
m->last = Qundef;
|
|
rb_block_call(obj, id_each, 0, 0, minmax_by_i, memo);
|
|
if (m->last_bv != Qundef)
|
|
minmax_by_i_update(m->last_bv, m->last_bv, m->last, m->last, m);
|
|
m = MEMO_FOR(struct minmax_by_t, memo);
|
|
return rb_assoc_new(m->min, m->max);
|
|
}
|
|
|
|
static VALUE
|
|
member_i(RB_BLOCK_CALL_FUNC_ARGLIST(iter, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
|
|
if (rb_equal(rb_enum_values_pack(argc, argv), memo->v1)) {
|
|
MEMO_V2_SET(memo, Qtrue);
|
|
rb_iter_break();
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.include?(obj) -> true or false
|
|
* enum.member?(obj) -> true or false
|
|
*
|
|
* Returns <code>true</code> if any member of <i>enum</i> equals
|
|
* <i>obj</i>. Equality is tested using <code>==</code>.
|
|
*
|
|
* IO.constants.include? :SEEK_SET #=> true
|
|
* IO.constants.include? :SEEK_NO_FURTHER #=> false
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_member(VALUE obj, VALUE val)
|
|
{
|
|
struct MEMO *memo = MEMO_NEW(val, Qfalse, 0);
|
|
|
|
rb_block_call(obj, id_each, 0, 0, member_i, (VALUE)memo);
|
|
return memo->v2;
|
|
}
|
|
|
|
static VALUE
|
|
each_with_index_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo))
|
|
{
|
|
long n = MEMO_CAST(memo)->u3.cnt++;
|
|
|
|
return rb_yield_values(2, rb_enum_values_pack(argc, argv), INT2NUM(n));
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.each_with_index(*args) { |obj, i| block } -> enum
|
|
* enum.each_with_index(*args) -> an_enumerator
|
|
*
|
|
* Calls <em>block</em> with two arguments, the item and its index,
|
|
* for each item in <i>enum</i>. Given arguments are passed through
|
|
* to #each().
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* hash = Hash.new
|
|
* %w(cat dog wombat).each_with_index { |item, index|
|
|
* hash[item] = index
|
|
* }
|
|
* hash #=> {"cat"=>0, "dog"=>1, "wombat"=>2}
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_each_with_index(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
struct MEMO *memo;
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
|
|
|
|
memo = MEMO_NEW(0, 0, 0);
|
|
rb_block_call(obj, id_each, argc, argv, each_with_index_i, (VALUE)memo);
|
|
return obj;
|
|
}
|
|
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.reverse_each(*args) { |item| block } -> enum
|
|
* enum.reverse_each(*args) -> an_enumerator
|
|
*
|
|
* Builds a temporary array and traverses that array in reverse order.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* (1..3).reverse_each { |v| p v }
|
|
*
|
|
* produces:
|
|
*
|
|
* 3
|
|
* 2
|
|
* 1
|
|
*/
|
|
|
|
static VALUE
|
|
enum_reverse_each(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
VALUE ary;
|
|
long i;
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
|
|
|
|
ary = enum_to_a(argc, argv, obj);
|
|
|
|
for (i = RARRAY_LEN(ary); --i >= 0; ) {
|
|
rb_yield(RARRAY_AREF(ary, i));
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
|
|
|
|
static VALUE
|
|
each_val_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, p))
|
|
{
|
|
ENUM_WANT_SVALUE();
|
|
rb_yield(i);
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.each_entry { |obj| block } -> enum
|
|
* enum.each_entry -> an_enumerator
|
|
*
|
|
* Calls <i>block</i> once for each element in +self+, passing that
|
|
* element as a parameter, converting multiple values from yield to an
|
|
* array.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* class Foo
|
|
* include Enumerable
|
|
* def each
|
|
* yield 1
|
|
* yield 1, 2
|
|
* yield
|
|
* end
|
|
* end
|
|
* Foo.new.each_entry{ |o| p o }
|
|
*
|
|
* produces:
|
|
*
|
|
* 1
|
|
* [1, 2]
|
|
* nil
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_each_entry(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);
|
|
rb_block_call(obj, id_each, argc, argv, each_val_i, 0);
|
|
return obj;
|
|
}
|
|
|
|
#define dont_recycle_block_arg(arity) ((arity) == 1 || (arity) < 0)
|
|
|
|
static VALUE
|
|
each_slice_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, m))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(m);
|
|
VALUE ary = memo->v1;
|
|
VALUE v = Qnil;
|
|
long size = memo->u3.cnt;
|
|
ENUM_WANT_SVALUE();
|
|
|
|
rb_ary_push(ary, i);
|
|
|
|
if (RARRAY_LEN(ary) == size) {
|
|
v = rb_yield(ary);
|
|
|
|
if (memo->v2) {
|
|
MEMO_V1_SET(memo, rb_ary_new2(size));
|
|
}
|
|
else {
|
|
rb_ary_clear(ary);
|
|
}
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
static VALUE
|
|
enum_each_slice_size(VALUE obj, VALUE args, VALUE eobj)
|
|
{
|
|
VALUE n, size;
|
|
long slice_size = NUM2LONG(RARRAY_AREF(args, 0));
|
|
if (slice_size <= 0) rb_raise(rb_eArgError, "invalid slice size");
|
|
|
|
size = enum_size(obj, 0, 0);
|
|
if (size == Qnil) return Qnil;
|
|
|
|
n = rb_funcall(size, '+', 1, LONG2NUM(slice_size-1));
|
|
return rb_funcall(n, id_div, 1, LONG2FIX(slice_size));
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.each_slice(n) { ... } -> nil
|
|
* enum.each_slice(n) -> an_enumerator
|
|
*
|
|
* Iterates the given block for each slice of <n> elements. If no
|
|
* block is given, returns an enumerator.
|
|
*
|
|
* (1..10).each_slice(3) { |a| p a }
|
|
* # outputs below
|
|
* [1, 2, 3]
|
|
* [4, 5, 6]
|
|
* [7, 8, 9]
|
|
* [10]
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_each_slice(VALUE obj, VALUE n)
|
|
{
|
|
long size = NUM2LONG(n);
|
|
VALUE ary;
|
|
struct MEMO *memo;
|
|
int arity;
|
|
|
|
if (size <= 0) rb_raise(rb_eArgError, "invalid slice size");
|
|
RETURN_SIZED_ENUMERATOR(obj, 1, &n, enum_each_slice_size);
|
|
size = limit_by_enum_size(obj, size);
|
|
ary = rb_ary_new2(size);
|
|
arity = rb_block_arity();
|
|
memo = MEMO_NEW(ary, dont_recycle_block_arg(arity), size);
|
|
rb_block_call(obj, id_each, 0, 0, each_slice_i, (VALUE)memo);
|
|
ary = memo->v1;
|
|
if (RARRAY_LEN(ary) > 0) rb_yield(ary);
|
|
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
each_cons_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
VALUE ary = memo->v1;
|
|
VALUE v = Qnil;
|
|
long size = memo->u3.cnt;
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (RARRAY_LEN(ary) == size) {
|
|
rb_ary_shift(ary);
|
|
}
|
|
rb_ary_push(ary, i);
|
|
if (RARRAY_LEN(ary) == size) {
|
|
if (memo->v2) {
|
|
ary = rb_ary_dup(ary);
|
|
}
|
|
v = rb_yield(ary);
|
|
}
|
|
return v;
|
|
}
|
|
|
|
static VALUE
|
|
enum_each_cons_size(VALUE obj, VALUE args, VALUE eobj)
|
|
{
|
|
VALUE n, size;
|
|
long cons_size = NUM2LONG(RARRAY_AREF(args, 0));
|
|
if (cons_size <= 0) rb_raise(rb_eArgError, "invalid size");
|
|
|
|
size = enum_size(obj, 0, 0);
|
|
if (size == Qnil) return Qnil;
|
|
|
|
n = rb_funcall(size, '+', 1, LONG2NUM(1 - cons_size));
|
|
return (rb_cmpint(rb_funcall(n, id_cmp, 1, LONG2FIX(0)), n, LONG2FIX(0)) == -1) ? LONG2FIX(0) : n;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.each_cons(n) { ... } -> nil
|
|
* enum.each_cons(n) -> an_enumerator
|
|
*
|
|
* Iterates the given block for each array of consecutive <n>
|
|
* elements. If no block is given, returns an enumerator.
|
|
*
|
|
* e.g.:
|
|
* (1..10).each_cons(3) { |a| p a }
|
|
* # outputs below
|
|
* [1, 2, 3]
|
|
* [2, 3, 4]
|
|
* [3, 4, 5]
|
|
* [4, 5, 6]
|
|
* [5, 6, 7]
|
|
* [6, 7, 8]
|
|
* [7, 8, 9]
|
|
* [8, 9, 10]
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_each_cons(VALUE obj, VALUE n)
|
|
{
|
|
long size = NUM2LONG(n);
|
|
struct MEMO *memo;
|
|
int arity;
|
|
|
|
if (size <= 0) rb_raise(rb_eArgError, "invalid size");
|
|
RETURN_SIZED_ENUMERATOR(obj, 1, &n, enum_each_cons_size);
|
|
arity = rb_block_arity();
|
|
if (enum_size_over_p(obj, size)) return Qnil;
|
|
memo = MEMO_NEW(rb_ary_new2(size), dont_recycle_block_arg(arity), size);
|
|
rb_block_call(obj, id_each, 0, 0, each_cons_i, (VALUE)memo);
|
|
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
each_with_object_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, memo))
|
|
{
|
|
ENUM_WANT_SVALUE();
|
|
return rb_yield_values(2, i, memo);
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.each_with_object(obj) { |(*args), memo_obj| ... } -> obj
|
|
* enum.each_with_object(obj) -> an_enumerator
|
|
*
|
|
* Iterates the given block for each element with an arbitrary
|
|
* object given, and returns the initially given object.
|
|
*
|
|
* If no block is given, returns an enumerator.
|
|
*
|
|
* evens = (1..10).each_with_object([]) { |i, a| a << i*2 }
|
|
* #=> [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_each_with_object(VALUE obj, VALUE memo)
|
|
{
|
|
RETURN_SIZED_ENUMERATOR(obj, 1, &memo, enum_size);
|
|
|
|
rb_block_call(obj, id_each, 0, 0, each_with_object_i, memo);
|
|
|
|
return memo;
|
|
}
|
|
|
|
static VALUE
|
|
zip_ary(RB_BLOCK_CALL_FUNC_ARGLIST(val, memoval))
|
|
{
|
|
struct MEMO *memo = (struct MEMO *)memoval;
|
|
volatile VALUE result = memo->v1;
|
|
volatile VALUE args = memo->v2;
|
|
long n = memo->u3.cnt++;
|
|
volatile VALUE tmp;
|
|
int i;
|
|
|
|
tmp = rb_ary_new2(RARRAY_LEN(args) + 1);
|
|
rb_ary_store(tmp, 0, rb_enum_values_pack(argc, argv));
|
|
for (i=0; i<RARRAY_LEN(args); i++) {
|
|
VALUE e = RARRAY_AREF(args, i);
|
|
|
|
if (RARRAY_LEN(e) <= n) {
|
|
rb_ary_push(tmp, Qnil);
|
|
}
|
|
else {
|
|
rb_ary_push(tmp, RARRAY_AREF(e, n));
|
|
}
|
|
}
|
|
if (NIL_P(result)) {
|
|
rb_yield(tmp);
|
|
}
|
|
else {
|
|
rb_ary_push(result, tmp);
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
call_next(VALUE *v)
|
|
{
|
|
return v[0] = rb_funcallv(v[1], id_next, 0, 0);
|
|
}
|
|
|
|
static VALUE
|
|
call_stop(VALUE *v)
|
|
{
|
|
return v[0] = Qundef;
|
|
}
|
|
|
|
static VALUE
|
|
zip_i(RB_BLOCK_CALL_FUNC_ARGLIST(val, memoval))
|
|
{
|
|
struct MEMO *memo = (struct MEMO *)memoval;
|
|
volatile VALUE result = memo->v1;
|
|
volatile VALUE args = memo->v2;
|
|
volatile VALUE tmp;
|
|
int i;
|
|
|
|
tmp = rb_ary_new2(RARRAY_LEN(args) + 1);
|
|
rb_ary_store(tmp, 0, rb_enum_values_pack(argc, argv));
|
|
for (i=0; i<RARRAY_LEN(args); i++) {
|
|
if (NIL_P(RARRAY_AREF(args, i))) {
|
|
rb_ary_push(tmp, Qnil);
|
|
}
|
|
else {
|
|
VALUE v[2];
|
|
|
|
v[1] = RARRAY_AREF(args, i);
|
|
rb_rescue2(call_next, (VALUE)v, call_stop, (VALUE)v, rb_eStopIteration, (VALUE)0);
|
|
if (v[0] == Qundef) {
|
|
RARRAY_ASET(args, i, Qnil);
|
|
v[0] = Qnil;
|
|
}
|
|
rb_ary_push(tmp, v[0]);
|
|
}
|
|
}
|
|
if (NIL_P(result)) {
|
|
rb_yield(tmp);
|
|
}
|
|
else {
|
|
rb_ary_push(result, tmp);
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.zip(arg, ...) -> an_array_of_array
|
|
* enum.zip(arg, ...) { |arr| block } -> nil
|
|
*
|
|
* Takes one element from <i>enum</i> and merges corresponding
|
|
* elements from each <i>args</i>. This generates a sequence of
|
|
* <em>n</em>-element arrays, where <em>n</em> is one more than the
|
|
* count of arguments. The length of the resulting sequence will be
|
|
* <code>enum#size</code>. If the size of any argument is less than
|
|
* <code>enum#size</code>, <code>nil</code> values are supplied. If
|
|
* a block is given, it is invoked for each output array, otherwise
|
|
* an array of arrays is returned.
|
|
*
|
|
* a = [ 4, 5, 6 ]
|
|
* b = [ 7, 8, 9 ]
|
|
*
|
|
* a.zip(b) #=> [[4, 7], [5, 8], [6, 9]]
|
|
* [1, 2, 3].zip(a, b) #=> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
|
|
* [1, 2].zip(a, b) #=> [[1, 4, 7], [2, 5, 8]]
|
|
* a.zip([1, 2], [8]) #=> [[4, 1, 8], [5, 2, nil], [6, nil, nil]]
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_zip(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
int i;
|
|
ID conv;
|
|
struct MEMO *memo;
|
|
VALUE result = Qnil;
|
|
VALUE args = rb_ary_new4(argc, argv);
|
|
int allary = TRUE;
|
|
|
|
argv = RARRAY_PTR(args);
|
|
for (i=0; i<argc; i++) {
|
|
VALUE ary = rb_check_array_type(argv[i]);
|
|
if (NIL_P(ary)) {
|
|
allary = FALSE;
|
|
break;
|
|
}
|
|
argv[i] = ary;
|
|
}
|
|
if (!allary) {
|
|
CONST_ID(conv, "to_enum");
|
|
for (i=0; i<argc; i++) {
|
|
if (!rb_respond_to(argv[i], id_each)) {
|
|
rb_raise(rb_eTypeError, "wrong argument type %s (must respond to :each)",
|
|
rb_obj_classname(argv[i]));
|
|
}
|
|
argv[i] = rb_funcall(argv[i], conv, 1, ID2SYM(id_each));
|
|
}
|
|
}
|
|
if (!rb_block_given_p()) {
|
|
result = rb_ary_new();
|
|
}
|
|
|
|
/* TODO: use NODE_DOT2 as memo(v, v, -) */
|
|
memo = MEMO_NEW(result, args, 0);
|
|
rb_block_call(obj, id_each, 0, 0, allary ? zip_ary : zip_i, (VALUE)memo);
|
|
|
|
return result;
|
|
}
|
|
|
|
static VALUE
|
|
take_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
rb_ary_push(memo->v1, rb_enum_values_pack(argc, argv));
|
|
if (--memo->u3.cnt == 0) rb_iter_break();
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.take(n) -> array
|
|
*
|
|
* Returns first n elements from <i>enum</i>.
|
|
*
|
|
* a = [1, 2, 3, 4, 5, 0]
|
|
* a.take(3) #=> [1, 2, 3]
|
|
* a.take(30) #=> [1, 2, 3, 4, 5, 0]
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_take(VALUE obj, VALUE n)
|
|
{
|
|
struct MEMO *memo;
|
|
VALUE result;
|
|
long len = NUM2LONG(n);
|
|
|
|
if (len < 0) {
|
|
rb_raise(rb_eArgError, "attempt to take negative size");
|
|
}
|
|
|
|
if (len == 0) return rb_ary_new2(0);
|
|
result = rb_ary_new2(len);
|
|
memo = MEMO_NEW(result, 0, len);
|
|
rb_block_call(obj, id_each, 0, 0, take_i, (VALUE)memo);
|
|
return result;
|
|
}
|
|
|
|
|
|
static VALUE
|
|
take_while_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
|
|
{
|
|
if (!RTEST(enum_yield(argc, argv))) rb_iter_break();
|
|
rb_ary_push(ary, rb_enum_values_pack(argc, argv));
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.take_while { |arr| block } -> array
|
|
* enum.take_while -> an_enumerator
|
|
*
|
|
* Passes elements to the block until the block returns +nil+ or +false+,
|
|
* then stops iterating and returns an array of all prior elements.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* a = [1, 2, 3, 4, 5, 0]
|
|
* a.take_while { |i| i < 3 } #=> [1, 2]
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_take_while(VALUE obj)
|
|
{
|
|
VALUE ary;
|
|
|
|
RETURN_ENUMERATOR(obj, 0, 0);
|
|
ary = rb_ary_new();
|
|
rb_block_call(obj, id_each, 0, 0, take_while_i, ary);
|
|
return ary;
|
|
}
|
|
|
|
static VALUE
|
|
drop_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
if (memo->u3.cnt == 0) {
|
|
rb_ary_push(memo->v1, rb_enum_values_pack(argc, argv));
|
|
}
|
|
else {
|
|
memo->u3.cnt--;
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.drop(n) -> array
|
|
*
|
|
* Drops first n elements from <i>enum</i>, and returns rest elements
|
|
* in an array.
|
|
*
|
|
* a = [1, 2, 3, 4, 5, 0]
|
|
* a.drop(3) #=> [4, 5, 0]
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_drop(VALUE obj, VALUE n)
|
|
{
|
|
VALUE result;
|
|
struct MEMO *memo;
|
|
long len = NUM2LONG(n);
|
|
|
|
if (len < 0) {
|
|
rb_raise(rb_eArgError, "attempt to drop negative size");
|
|
}
|
|
|
|
result = rb_ary_new();
|
|
memo = MEMO_NEW(result, 0, len);
|
|
rb_block_call(obj, id_each, 0, 0, drop_i, (VALUE)memo);
|
|
return result;
|
|
}
|
|
|
|
|
|
static VALUE
|
|
drop_while_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, args))
|
|
{
|
|
struct MEMO *memo = MEMO_CAST(args);
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (!memo->u3.state && !RTEST(rb_yield(i))) {
|
|
memo->u3.state = TRUE;
|
|
}
|
|
if (memo->u3.state) {
|
|
rb_ary_push(memo->v1, i);
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.drop_while { |arr| block } -> array
|
|
* enum.drop_while -> an_enumerator
|
|
*
|
|
* Drops elements up to, but not including, the first element for
|
|
* which the block returns +nil+ or +false+ and returns an array
|
|
* containing the remaining elements.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* a = [1, 2, 3, 4, 5, 0]
|
|
* a.drop_while { |i| i < 3 } #=> [3, 4, 5, 0]
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_drop_while(VALUE obj)
|
|
{
|
|
VALUE result;
|
|
struct MEMO *memo;
|
|
|
|
RETURN_ENUMERATOR(obj, 0, 0);
|
|
result = rb_ary_new();
|
|
memo = MEMO_NEW(result, 0, FALSE);
|
|
rb_block_call(obj, id_each, 0, 0, drop_while_i, (VALUE)memo);
|
|
return result;
|
|
}
|
|
|
|
static VALUE
|
|
cycle_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, ary))
|
|
{
|
|
ENUM_WANT_SVALUE();
|
|
|
|
rb_ary_push(ary, i);
|
|
rb_yield(i);
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
enum_cycle_size(VALUE self, VALUE args, VALUE eobj)
|
|
{
|
|
long mul;
|
|
VALUE n = Qnil;
|
|
VALUE size = enum_size(self, args, 0);
|
|
|
|
if (size == Qnil) return Qnil;
|
|
|
|
if (args && (RARRAY_LEN(args) > 0)) {
|
|
n = RARRAY_AREF(args, 0);
|
|
}
|
|
if (n == Qnil) return DBL2NUM(INFINITY);
|
|
mul = NUM2LONG(n);
|
|
if (mul <= 0) return INT2FIX(0);
|
|
return rb_funcall(size, '*', 1, LONG2FIX(mul));
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.cycle(n=nil) { |obj| block } -> nil
|
|
* enum.cycle(n=nil) -> an_enumerator
|
|
*
|
|
* Calls <i>block</i> for each element of <i>enum</i> repeatedly _n_
|
|
* times or forever if none or +nil+ is given. If a non-positive
|
|
* number is given or the collection is empty, does nothing. Returns
|
|
* +nil+ if the loop has finished without getting interrupted.
|
|
*
|
|
* Enumerable#cycle saves elements in an internal array so changes
|
|
* to <i>enum</i> after the first pass have no effect.
|
|
*
|
|
* If no block is given, an enumerator is returned instead.
|
|
*
|
|
* a = ["a", "b", "c"]
|
|
* a.cycle { |x| puts x } # print, a, b, c, a, b, c,.. forever.
|
|
* a.cycle(2) { |x| puts x } # print, a, b, c, a, b, c.
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_cycle(int argc, VALUE *argv, VALUE obj)
|
|
{
|
|
VALUE ary;
|
|
VALUE nv = Qnil;
|
|
long n, i, len;
|
|
|
|
rb_scan_args(argc, argv, "01", &nv);
|
|
|
|
RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_cycle_size);
|
|
if (NIL_P(nv)) {
|
|
n = -1;
|
|
}
|
|
else {
|
|
n = NUM2LONG(nv);
|
|
if (n <= 0) return Qnil;
|
|
}
|
|
ary = rb_ary_new();
|
|
RBASIC_CLEAR_CLASS(ary);
|
|
rb_block_call(obj, id_each, 0, 0, cycle_i, ary);
|
|
len = RARRAY_LEN(ary);
|
|
if (len == 0) return Qnil;
|
|
while (n < 0 || 0 < --n) {
|
|
for (i=0; i<len; i++) {
|
|
rb_yield(RARRAY_AREF(ary, i));
|
|
}
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
struct chunk_arg {
|
|
VALUE categorize;
|
|
VALUE state;
|
|
VALUE prev_value;
|
|
VALUE prev_elts;
|
|
VALUE yielder;
|
|
};
|
|
|
|
static VALUE
|
|
chunk_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _argp))
|
|
{
|
|
struct chunk_arg *argp = MEMO_FOR(struct chunk_arg, _argp);
|
|
VALUE v, s;
|
|
VALUE alone = ID2SYM(rb_intern("_alone"));
|
|
VALUE separator = ID2SYM(rb_intern("_separator"));
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (NIL_P(argp->state))
|
|
v = rb_funcall(argp->categorize, id_call, 1, i);
|
|
else
|
|
v = rb_funcall(argp->categorize, id_call, 2, i, argp->state);
|
|
|
|
if (v == alone) {
|
|
if (!NIL_P(argp->prev_value)) {
|
|
rb_funcall(argp->yielder, id_lshift, 1, rb_assoc_new(argp->prev_value, argp->prev_elts));
|
|
argp->prev_value = argp->prev_elts = Qnil;
|
|
}
|
|
rb_funcall(argp->yielder, id_lshift, 1, rb_assoc_new(v, rb_ary_new3(1, i)));
|
|
}
|
|
else if (NIL_P(v) || v == separator) {
|
|
if (!NIL_P(argp->prev_value)) {
|
|
rb_funcall(argp->yielder, id_lshift, 1, rb_assoc_new(argp->prev_value, argp->prev_elts));
|
|
argp->prev_value = argp->prev_elts = Qnil;
|
|
}
|
|
}
|
|
else if (SYMBOL_P(v) && (s = rb_sym2str(v), RSTRING_PTR(s)[0] == '_')) {
|
|
rb_raise(rb_eRuntimeError, "symbols beginning with an underscore are reserved");
|
|
}
|
|
else {
|
|
if (NIL_P(argp->prev_value)) {
|
|
argp->prev_value = v;
|
|
argp->prev_elts = rb_ary_new3(1, i);
|
|
}
|
|
else {
|
|
if (rb_equal(argp->prev_value, v)) {
|
|
rb_ary_push(argp->prev_elts, i);
|
|
}
|
|
else {
|
|
rb_funcall(argp->yielder, id_lshift, 1, rb_assoc_new(argp->prev_value, argp->prev_elts));
|
|
argp->prev_value = v;
|
|
argp->prev_elts = rb_ary_new3(1, i);
|
|
}
|
|
}
|
|
}
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
chunk_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
|
|
{
|
|
VALUE enumerable;
|
|
VALUE arg;
|
|
struct chunk_arg *memo = NEW_MEMO_FOR(struct chunk_arg, arg);
|
|
|
|
enumerable = rb_ivar_get(enumerator, rb_intern("chunk_enumerable"));
|
|
memo->categorize = rb_ivar_get(enumerator, rb_intern("chunk_categorize"));
|
|
memo->state = rb_ivar_get(enumerator, rb_intern("chunk_initial_state"));
|
|
memo->prev_value = Qnil;
|
|
memo->prev_elts = Qnil;
|
|
memo->yielder = yielder;
|
|
|
|
if (!NIL_P(memo->state))
|
|
memo->state = rb_obj_dup(memo->state);
|
|
|
|
rb_block_call(enumerable, id_each, 0, 0, chunk_ii, arg);
|
|
memo = MEMO_FOR(struct chunk_arg, arg);
|
|
if (!NIL_P(memo->prev_elts))
|
|
rb_funcall(memo->yielder, id_lshift, 1, rb_assoc_new(memo->prev_value, memo->prev_elts));
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.chunk { |elt| ... } -> an_enumerator
|
|
* enum.chunk(initial_state) { |elt, state| ... } -> an_enumerator (deprecated)
|
|
*
|
|
* Enumerates over the items, chunking them together based on the return
|
|
* value of the block.
|
|
*
|
|
* Consecutive elements which return the same block value are chunked together.
|
|
*
|
|
* For example, consecutive even numbers and odd numbers can be
|
|
* chunked as follows.
|
|
*
|
|
* [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5].chunk { |n|
|
|
* n.even?
|
|
* }.each { |even, ary|
|
|
* p [even, ary]
|
|
* }
|
|
* #=> [false, [3, 1]]
|
|
* # [true, [4]]
|
|
* # [false, [1, 5, 9]]
|
|
* # [true, [2, 6]]
|
|
* # [false, [5, 3, 5]]
|
|
*
|
|
* This method is especially useful for sorted series of elements.
|
|
* The following example counts words for each initial letter.
|
|
*
|
|
* open("/usr/share/dict/words", "r:iso-8859-1") { |f|
|
|
* f.chunk { |line| line.ord }.each { |ch, lines| p [ch.chr, lines.length] }
|
|
* }
|
|
* #=> ["\n", 1]
|
|
* # ["A", 1327]
|
|
* # ["B", 1372]
|
|
* # ["C", 1507]
|
|
* # ["D", 791]
|
|
* # ...
|
|
*
|
|
* The following key values have special meaning:
|
|
* - +nil+ and +:_separator+ specifies that the elements should be dropped.
|
|
* - +:_alone+ specifies that the element should be chunked by itself.
|
|
*
|
|
* Any other symbols that begin with an underscore will raise an error:
|
|
*
|
|
* items.chunk { |item| :_underscore }
|
|
* #=> RuntimeError: symbols beginning with an underscore are reserved
|
|
*
|
|
* +nil+ and +:_separator+ can be used to ignore some elements.
|
|
*
|
|
* For example, the sequence of hyphens in svn log can be eliminated as follows:
|
|
*
|
|
* sep = "-"*72 + "\n"
|
|
* IO.popen("svn log README") { |f|
|
|
* f.chunk { |line|
|
|
* line != sep || nil
|
|
* }.each { |_, lines|
|
|
* pp lines
|
|
* }
|
|
* }
|
|
* #=> ["r20018 | knu | 2008-10-29 13:20:42 +0900 (Wed, 29 Oct 2008) | 2 lines\n",
|
|
* # "\n",
|
|
* # "* README, README.ja: Update the portability section.\n",
|
|
* # "\n"]
|
|
* # ["r16725 | knu | 2008-05-31 23:34:23 +0900 (Sat, 31 May 2008) | 2 lines\n",
|
|
* # "\n",
|
|
* # "* README, README.ja: Add a note about default C flags.\n",
|
|
* # "\n"]
|
|
* # ...
|
|
*
|
|
* Paragraphs separated by empty lines can be parsed as follows:
|
|
*
|
|
* File.foreach("README").chunk { |line|
|
|
* /\A\s*\z/ !~ line || nil
|
|
* }.each { |_, lines|
|
|
* pp lines
|
|
* }
|
|
*
|
|
* +:_alone+ can be used to force items into their own chunk.
|
|
* For example, you can put lines that contain a URL by themselves,
|
|
* and chunk the rest of the lines together, like this:
|
|
*
|
|
* pattern = /http/
|
|
* open(filename) { |f|
|
|
* f.chunk { |line| line =~ pattern ? :_alone : true }.each { |key, lines|
|
|
* pp lines
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_chunk(int argc, VALUE *argv, VALUE enumerable)
|
|
{
|
|
VALUE initial_state;
|
|
VALUE enumerator;
|
|
int n;
|
|
|
|
if (!rb_block_given_p())
|
|
rb_raise(rb_eArgError, "no block given");
|
|
n = rb_scan_args(argc, argv, "01", &initial_state);
|
|
if (n != 0)
|
|
rb_warn("initial_state given for chunk. (Use local variables.)");
|
|
|
|
enumerator = rb_obj_alloc(rb_cEnumerator);
|
|
rb_ivar_set(enumerator, rb_intern("chunk_enumerable"), enumerable);
|
|
rb_ivar_set(enumerator, rb_intern("chunk_categorize"), rb_block_proc());
|
|
rb_ivar_set(enumerator, rb_intern("chunk_initial_state"), initial_state);
|
|
rb_block_call(enumerator, idInitialize, 0, 0, chunk_i, enumerator);
|
|
return enumerator;
|
|
}
|
|
|
|
|
|
struct slicebefore_arg {
|
|
VALUE sep_pred;
|
|
VALUE sep_pat;
|
|
VALUE state;
|
|
VALUE prev_elts;
|
|
VALUE yielder;
|
|
};
|
|
|
|
static VALUE
|
|
slicebefore_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _argp))
|
|
{
|
|
struct slicebefore_arg *argp = MEMO_FOR(struct slicebefore_arg, _argp);
|
|
VALUE header_p;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (!NIL_P(argp->sep_pat))
|
|
header_p = rb_funcall(argp->sep_pat, id_eqq, 1, i);
|
|
else if (NIL_P(argp->state))
|
|
header_p = rb_funcall(argp->sep_pred, id_call, 1, i);
|
|
else
|
|
header_p = rb_funcall(argp->sep_pred, id_call, 2, i, argp->state);
|
|
if (RTEST(header_p)) {
|
|
if (!NIL_P(argp->prev_elts))
|
|
rb_funcall(argp->yielder, id_lshift, 1, argp->prev_elts);
|
|
argp->prev_elts = rb_ary_new3(1, i);
|
|
}
|
|
else {
|
|
if (NIL_P(argp->prev_elts))
|
|
argp->prev_elts = rb_ary_new3(1, i);
|
|
else
|
|
rb_ary_push(argp->prev_elts, i);
|
|
}
|
|
|
|
return Qnil;
|
|
}
|
|
|
|
static VALUE
|
|
slicebefore_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
|
|
{
|
|
VALUE enumerable;
|
|
VALUE arg;
|
|
struct slicebefore_arg *memo = NEW_MEMO_FOR(struct slicebefore_arg, arg);
|
|
|
|
enumerable = rb_ivar_get(enumerator, rb_intern("slicebefore_enumerable"));
|
|
memo->sep_pred = rb_attr_get(enumerator, rb_intern("slicebefore_sep_pred"));
|
|
memo->sep_pat = NIL_P(memo->sep_pred) ? rb_ivar_get(enumerator, rb_intern("slicebefore_sep_pat")) : Qnil;
|
|
memo->state = rb_attr_get(enumerator, rb_intern("slicebefore_initial_state"));
|
|
memo->prev_elts = Qnil;
|
|
memo->yielder = yielder;
|
|
|
|
if (!NIL_P(memo->state))
|
|
memo->state = rb_obj_dup(memo->state);
|
|
|
|
rb_block_call(enumerable, id_each, 0, 0, slicebefore_ii, arg);
|
|
memo = MEMO_FOR(struct slicebefore_arg, arg);
|
|
if (!NIL_P(memo->prev_elts))
|
|
rb_funcall(memo->yielder, id_lshift, 1, memo->prev_elts);
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.slice_before(pattern) -> an_enumerator
|
|
* enum.slice_before { |elt| bool } -> an_enumerator
|
|
* enum.slice_before(initial_state) { |elt, state| bool } -> an_enumerator (deprecated)
|
|
*
|
|
* Creates an enumerator for each chunked elements.
|
|
* The beginnings of chunks are defined by _pattern_ and the block.
|
|
|
|
* If <code>_pattern_ === _elt_</code> returns <code>true</code> or the block
|
|
* returns <code>true</code> for the element, the element is beginning of a
|
|
* chunk.
|
|
|
|
* The <code>===</code> and _block_ is called from the first element to the last
|
|
* element of _enum_. The result for the first element is ignored.
|
|
|
|
* The result enumerator yields the chunked elements as an array.
|
|
* So +each+ method can be called as follows:
|
|
*
|
|
* enum.slice_before(pattern).each { |ary| ... }
|
|
* enum.slice_before { |elt| bool }.each { |ary| ... }
|
|
*
|
|
* Other methods of the Enumerator class and Enumerable module,
|
|
* such as map, etc., are also usable.
|
|
*
|
|
* For example, iteration over ChangeLog entries can be implemented as
|
|
* follows:
|
|
*
|
|
* # iterate over ChangeLog entries.
|
|
* open("ChangeLog") { |f|
|
|
* f.slice_before(/\A\S/).each { |e| pp e }
|
|
* }
|
|
*
|
|
* # same as above. block is used instead of pattern argument.
|
|
* open("ChangeLog") { |f|
|
|
* f.slice_before { |line| /\A\S/ === line }.each { |e| pp e }
|
|
* }
|
|
*
|
|
*
|
|
* "svn proplist -R" produces multiline output for each file.
|
|
* They can be chunked as follows:
|
|
*
|
|
* IO.popen([{"LC_ALL"=>"C"}, "svn", "proplist", "-R"]) { |f|
|
|
* f.lines.slice_before(/\AProp/).each { |lines| p lines }
|
|
* }
|
|
* #=> ["Properties on '.':\n", " svn:ignore\n", " svk:merge\n"]
|
|
* # ["Properties on 'goruby.c':\n", " svn:eol-style\n"]
|
|
* # ["Properties on 'complex.c':\n", " svn:mime-type\n", " svn:eol-style\n"]
|
|
* # ["Properties on 'regparse.c':\n", " svn:eol-style\n"]
|
|
* # ...
|
|
*
|
|
* If the block needs to maintain state over multiple elements,
|
|
* local variables can be used.
|
|
* For example, three or more consecutive increasing numbers can be squashed
|
|
* as follows:
|
|
*
|
|
* a = [0, 2, 3, 4, 6, 7, 9]
|
|
* prev = a[0]
|
|
* p a.slice_before { |e|
|
|
* prev, prev2 = e, prev
|
|
* prev2 + 1 != e
|
|
* }.map { |es|
|
|
* es.length <= 2 ? es.join(",") : "#{es.first}-#{es.last}"
|
|
* }.join(",")
|
|
* #=> "0,2-4,6,7,9"
|
|
*
|
|
* However local variables should be used carefully
|
|
* if the result enumerator is enumerated twice or more.
|
|
* The local variables should be initialized for each enumeration.
|
|
* Enumerator.new can be used to do it.
|
|
*
|
|
* # Word wrapping. This assumes all characters have same width.
|
|
* def wordwrap(words, maxwidth)
|
|
* Enumerator.new {|y|
|
|
* # cols is initialized in Enumerator.new.
|
|
* cols = 0
|
|
* words.slice_before { |w|
|
|
* cols += 1 if cols != 0
|
|
* cols += w.length
|
|
* if maxwidth < cols
|
|
* cols = w.length
|
|
* true
|
|
* else
|
|
* false
|
|
* end
|
|
* }.each {|ws| y.yield ws }
|
|
* }
|
|
* end
|
|
* text = (1..20).to_a.join(" ")
|
|
* enum = wordwrap(text.split(/\s+/), 10)
|
|
* puts "-"*10
|
|
* enum.each { |ws| puts ws.join(" ") } # first enumeration.
|
|
* puts "-"*10
|
|
* enum.each { |ws| puts ws.join(" ") } # second enumeration generates same result as the first.
|
|
* puts "-"*10
|
|
* #=> ----------
|
|
* # 1 2 3 4 5
|
|
* # 6 7 8 9 10
|
|
* # 11 12 13
|
|
* # 14 15 16
|
|
* # 17 18 19
|
|
* # 20
|
|
* # ----------
|
|
* # 1 2 3 4 5
|
|
* # 6 7 8 9 10
|
|
* # 11 12 13
|
|
* # 14 15 16
|
|
* # 17 18 19
|
|
* # 20
|
|
* # ----------
|
|
*
|
|
* mbox contains series of mails which start with Unix From line.
|
|
* So each mail can be extracted by slice before Unix From line.
|
|
*
|
|
* # parse mbox
|
|
* open("mbox") { |f|
|
|
* f.slice_before { |line|
|
|
* line.start_with? "From "
|
|
* }.each { |mail|
|
|
* unix_from = mail.shift
|
|
* i = mail.index("\n")
|
|
* header = mail[0...i]
|
|
* body = mail[(i+1)..-1]
|
|
* body.pop if body.last == "\n"
|
|
* fields = header.slice_before { |line| !" \t".include?(line[0]) }.to_a
|
|
* p unix_from
|
|
* pp fields
|
|
* pp body
|
|
* }
|
|
* }
|
|
*
|
|
* # split mails in mbox (slice before Unix From line after an empty line)
|
|
* open("mbox") { |f|
|
|
* f.slice_before(emp: true) { |line, h|
|
|
* prevemp = h[:emp]
|
|
* h[:emp] = line == "\n"
|
|
* prevemp && line.start_with?("From ")
|
|
* }.each { |mail|
|
|
* mail.pop if mail.last == "\n"
|
|
* pp mail
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_slice_before(int argc, VALUE *argv, VALUE enumerable)
|
|
{
|
|
VALUE enumerator;
|
|
|
|
if (rb_block_given_p()) {
|
|
VALUE initial_state;
|
|
int n;
|
|
n = rb_scan_args(argc, argv, "01", &initial_state);
|
|
if (n != 0)
|
|
rb_warn("initial_state given for slice_before. (Use local variables.)");
|
|
enumerator = rb_obj_alloc(rb_cEnumerator);
|
|
rb_ivar_set(enumerator, rb_intern("slicebefore_sep_pred"), rb_block_proc());
|
|
rb_ivar_set(enumerator, rb_intern("slicebefore_initial_state"), initial_state);
|
|
}
|
|
else {
|
|
VALUE sep_pat;
|
|
rb_scan_args(argc, argv, "1", &sep_pat);
|
|
enumerator = rb_obj_alloc(rb_cEnumerator);
|
|
rb_ivar_set(enumerator, rb_intern("slicebefore_sep_pat"), sep_pat);
|
|
}
|
|
rb_ivar_set(enumerator, rb_intern("slicebefore_enumerable"), enumerable);
|
|
rb_block_call(enumerator, idInitialize, 0, 0, slicebefore_i, enumerator);
|
|
return enumerator;
|
|
}
|
|
|
|
|
|
struct sliceafter_arg {
|
|
VALUE pat;
|
|
VALUE pred;
|
|
VALUE prev_elts;
|
|
VALUE yielder;
|
|
};
|
|
|
|
static VALUE
|
|
sliceafter_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
|
|
{
|
|
#define UPDATE_MEMO ((void)(memo = MEMO_FOR(struct sliceafter_arg, _memo)))
|
|
struct sliceafter_arg *memo;
|
|
int split_p;
|
|
UPDATE_MEMO;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (NIL_P(memo->prev_elts)) {
|
|
memo->prev_elts = rb_ary_new3(1, i);
|
|
}
|
|
else {
|
|
rb_ary_push(memo->prev_elts, i);
|
|
}
|
|
|
|
if (NIL_P(memo->pred)) {
|
|
split_p = RTEST(rb_funcall(memo->pat, id_eqq, 1, i));
|
|
UPDATE_MEMO;
|
|
}
|
|
else {
|
|
split_p = RTEST(rb_funcall(memo->pred, id_call, 1, i));
|
|
UPDATE_MEMO;
|
|
}
|
|
|
|
if (split_p) {
|
|
rb_funcall(memo->yielder, id_lshift, 1, memo->prev_elts);
|
|
UPDATE_MEMO;
|
|
memo->prev_elts = Qnil;
|
|
}
|
|
|
|
return Qnil;
|
|
#undef UPDATE_MEMO
|
|
}
|
|
|
|
static VALUE
|
|
sliceafter_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
|
|
{
|
|
VALUE enumerable;
|
|
VALUE arg;
|
|
struct sliceafter_arg *memo = NEW_MEMO_FOR(struct sliceafter_arg, arg);
|
|
|
|
enumerable = rb_ivar_get(enumerator, rb_intern("sliceafter_enum"));
|
|
memo->pat = rb_ivar_get(enumerator, rb_intern("sliceafter_pat"));
|
|
memo->pred = rb_attr_get(enumerator, rb_intern("sliceafter_pred"));
|
|
memo->prev_elts = Qnil;
|
|
memo->yielder = yielder;
|
|
|
|
rb_block_call(enumerable, id_each, 0, 0, sliceafter_ii, arg);
|
|
memo = MEMO_FOR(struct sliceafter_arg, arg);
|
|
if (!NIL_P(memo->prev_elts))
|
|
rb_funcall(memo->yielder, id_lshift, 1, memo->prev_elts);
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.slice_after(pattern) -> an_enumerator
|
|
* enum.slice_after { |elt| bool } -> an_enumerator
|
|
*
|
|
* Creates an enumerator for each chunked elements.
|
|
* The ends of chunks are defined by _pattern_ and the block.
|
|
*
|
|
* If <code>_pattern_ === _elt_</code> returns <code>true</code> or the block
|
|
* returns <code>true</code> for the element, the element is end of a
|
|
* chunk.
|
|
*
|
|
* The <code>===</code> and _block_ is called from the first element to the last
|
|
* element of _enum_.
|
|
*
|
|
* The result enumerator yields the chunked elements as an array.
|
|
* So +each+ method can be called as follows:
|
|
*
|
|
* enum.slice_after(pattern).each { |ary| ... }
|
|
* enum.slice_after { |elt| bool }.each { |ary| ... }
|
|
*
|
|
* Other methods of the Enumerator class and Enumerable module,
|
|
* such as +map+, etc., are also usable.
|
|
*
|
|
* For example, continuation lines (lines end with backslash) can be
|
|
* concatenated as follows:
|
|
*
|
|
* lines = ["foo\n", "bar\\\n", "baz\n", "\n", "qux\n"]
|
|
* e = lines.slice_after(/(?<!\\)\n\z/)
|
|
* p e.to_a
|
|
* #=> [["foo\n"], ["bar\\\n", "baz\n"], ["\n"], ["qux\n"]]
|
|
* p e.map {|ll| ll[0...-1].map {|l| l.sub(/\\\n\z/, "") }.join + ll.last }
|
|
* #=>["foo\n", "barbaz\n", "\n", "qux\n"]
|
|
*
|
|
*/
|
|
|
|
static VALUE
|
|
enum_slice_after(int argc, VALUE *argv, VALUE enumerable)
|
|
{
|
|
VALUE enumerator;
|
|
VALUE pat = Qnil, pred = Qnil;
|
|
|
|
if (rb_block_given_p()) {
|
|
if (0 < argc)
|
|
rb_raise(rb_eArgError, "both pattern and block are given");
|
|
pred = rb_block_proc();
|
|
}
|
|
else {
|
|
rb_scan_args(argc, argv, "1", &pat);
|
|
}
|
|
|
|
enumerator = rb_obj_alloc(rb_cEnumerator);
|
|
rb_ivar_set(enumerator, rb_intern("sliceafter_enum"), enumerable);
|
|
rb_ivar_set(enumerator, rb_intern("sliceafter_pat"), pat);
|
|
rb_ivar_set(enumerator, rb_intern("sliceafter_pred"), pred);
|
|
|
|
rb_block_call(enumerator, idInitialize, 0, 0, sliceafter_i, enumerator);
|
|
return enumerator;
|
|
}
|
|
|
|
struct slicewhen_arg {
|
|
VALUE pred;
|
|
VALUE prev_elt;
|
|
VALUE prev_elts;
|
|
VALUE yielder;
|
|
};
|
|
|
|
static VALUE
|
|
slicewhen_ii(RB_BLOCK_CALL_FUNC_ARGLIST(i, _memo))
|
|
{
|
|
#define UPDATE_MEMO ((void)(memo = MEMO_FOR(struct slicewhen_arg, _memo)))
|
|
struct slicewhen_arg *memo;
|
|
int split_p;
|
|
UPDATE_MEMO;
|
|
|
|
ENUM_WANT_SVALUE();
|
|
|
|
if (memo->prev_elt == Qundef) {
|
|
/* The first element */
|
|
memo->prev_elt = i;
|
|
memo->prev_elts = rb_ary_new3(1, i);
|
|
}
|
|
else {
|
|
split_p = RTEST(rb_funcall(memo->pred, id_call, 2, memo->prev_elt, i));
|
|
UPDATE_MEMO;
|
|
|
|
if (split_p) {
|
|
rb_funcall(memo->yielder, id_lshift, 1, memo->prev_elts);
|
|
UPDATE_MEMO;
|
|
memo->prev_elts = rb_ary_new3(1, i);
|
|
}
|
|
else {
|
|
rb_ary_push(memo->prev_elts, i);
|
|
}
|
|
|
|
memo->prev_elt = i;
|
|
}
|
|
|
|
return Qnil;
|
|
#undef UPDATE_MEMO
|
|
}
|
|
|
|
static VALUE
|
|
slicewhen_i(RB_BLOCK_CALL_FUNC_ARGLIST(yielder, enumerator))
|
|
{
|
|
VALUE enumerable;
|
|
VALUE arg;
|
|
struct slicewhen_arg *memo = NEW_MEMO_FOR(struct slicewhen_arg, arg);
|
|
|
|
enumerable = rb_ivar_get(enumerator, rb_intern("slicewhen_enum"));
|
|
memo->pred = rb_attr_get(enumerator, rb_intern("slicewhen_pred"));
|
|
memo->prev_elt = Qundef;
|
|
memo->prev_elts = Qnil;
|
|
memo->yielder = yielder;
|
|
|
|
rb_block_call(enumerable, id_each, 0, 0, slicewhen_ii, arg);
|
|
memo = MEMO_FOR(struct slicewhen_arg, arg);
|
|
if (!NIL_P(memo->prev_elts))
|
|
rb_funcall(memo->yielder, id_lshift, 1, memo->prev_elts);
|
|
return Qnil;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* enum.slice_when {|elt_before, elt_after| bool } -> an_enumerator
|
|
*
|
|
* Creates an enumerator for each chunked elements.
|
|
* The beginnings of chunks are defined by the block.
|
|
*
|
|
* This method split each chunk using adjacent elements,
|
|
* _elt_before_ and _elt_after_,
|
|
* in the receiver enumerator.
|
|
* This method split chunks between _elt_before_ and _elt_after_ where
|
|
* the block returns true.
|
|
*
|
|
* The block is called the length of the receiver enumerator minus one.
|
|
*
|
|
* The result enumerator yields the chunked elements as an array.
|
|
* So +each+ method can be called as follows:
|
|
*
|
|
* enum.slice_when { |elt_before, elt_after| bool }.each { |ary| ... }
|
|
*
|
|
* Other methods of the Enumerator class and Enumerable module,
|
|
* such as +to_a+, +map+, etc., are also usable.
|
|
*
|
|
* For example, one-by-one increasing subsequence can be chunked as follows:
|
|
*
|
|
* a = [1,2,4,9,10,11,12,15,16,19,20,21]
|
|
* b = a.slice_when {|i, j| i+1 != j }
|
|
* p b.to_a #=> [[1, 2], [4], [9, 10, 11, 12], [15, 16], [19, 20, 21]]
|
|
* c = b.map {|a| a.length < 3 ? a : "#{a.first}-#{a.last}" }
|
|
* p c #=> [[1, 2], [4], "9-12", [15, 16], "19-21"]
|
|
* d = c.join(",")
|
|
* p d #=> "1,2,4,9-12,15,16,19-21"
|
|
*
|
|
* Near elements (threshold: 6) in sorted array can be chunked as follows:
|
|
*
|
|
* a = [3, 11, 14, 25, 28, 29, 29, 41, 55, 57]
|
|
* p a.slice_when {|i, j| 6 < j - i }.to_a
|
|
* #=> [[3], [11, 14], [25, 28, 29, 29], [41], [55, 57]]
|
|
*
|
|
* Increasing (non-decreasing) subsequence can be chunked as follows:
|
|
*
|
|
* a = [0, 9, 2, 2, 3, 2, 7, 5, 9, 5]
|
|
* p a.slice_when {|i, j| i > j }.to_a
|
|
* #=> [[0, 9], [2, 2, 3], [2, 7], [5, 9], [5]]
|
|
*
|
|
* Adjacent evens and odds can be chunked as follows:
|
|
* (Enumerable#chunk is another way to do it.)
|
|
*
|
|
* a = [7, 5, 9, 2, 0, 7, 9, 4, 2, 0]
|
|
* p a.slice_when {|i, j| i.even? != j.even? }.to_a
|
|
* #=> [[7, 5, 9], [2, 0], [7, 9], [4, 2, 0]]
|
|
*
|
|
* Paragraphs (non-empty lines with trailing empty lines) can be chunked as follows:
|
|
* (See Enumerable#chunk to ignore empty lines.)
|
|
*
|
|
* lines = ["foo\n", "bar\n", "\n", "baz\n", "qux\n"]
|
|
* p lines.slice_when {|l1, l2| /\A\s*\z/ =~ l1 && /\S/ =~ l2 }.to_a
|
|
* #=> [["foo\n", "bar\n", "\n"], ["baz\n", "qux\n"]]
|
|
*
|
|
*/
|
|
static VALUE
|
|
enum_slice_when(VALUE enumerable)
|
|
{
|
|
VALUE enumerator;
|
|
VALUE pred;
|
|
|
|
pred = rb_block_proc();
|
|
|
|
enumerator = rb_obj_alloc(rb_cEnumerator);
|
|
rb_ivar_set(enumerator, rb_intern("slicewhen_enum"), enumerable);
|
|
rb_ivar_set(enumerator, rb_intern("slicewhen_pred"), pred);
|
|
|
|
rb_block_call(enumerator, idInitialize, 0, 0, slicewhen_i, enumerator);
|
|
return enumerator;
|
|
}
|
|
|
|
/*
|
|
* The <code>Enumerable</code> mixin provides collection classes with
|
|
* several traversal and searching methods, and with the ability to
|
|
* sort. The class must provide a method <code>each</code>, which
|
|
* yields successive members of the collection. If
|
|
* <code>Enumerable#max</code>, <code>#min</code>, or
|
|
* <code>#sort</code> is used, the objects in the collection must also
|
|
* implement a meaningful <code><=></code> operator, as these methods
|
|
* rely on an ordering between members of the collection.
|
|
*/
|
|
|
|
void
|
|
Init_Enumerable(void)
|
|
{
|
|
#undef rb_intern
|
|
#define rb_intern(str) rb_intern_const(str)
|
|
|
|
rb_mEnumerable = rb_define_module("Enumerable");
|
|
|
|
rb_define_method(rb_mEnumerable, "to_a", enum_to_a, -1);
|
|
rb_define_method(rb_mEnumerable, "entries", enum_to_a, -1);
|
|
rb_define_method(rb_mEnumerable, "to_h", enum_to_h, -1);
|
|
|
|
rb_define_method(rb_mEnumerable, "sort", enum_sort, 0);
|
|
rb_define_method(rb_mEnumerable, "sort_by", enum_sort_by, 0);
|
|
rb_define_method(rb_mEnumerable, "grep", enum_grep, 1);
|
|
rb_define_method(rb_mEnumerable, "count", enum_count, -1);
|
|
rb_define_method(rb_mEnumerable, "find", enum_find, -1);
|
|
rb_define_method(rb_mEnumerable, "detect", enum_find, -1);
|
|
rb_define_method(rb_mEnumerable, "find_index", enum_find_index, -1);
|
|
rb_define_method(rb_mEnumerable, "find_all", enum_find_all, 0);
|
|
rb_define_method(rb_mEnumerable, "select", enum_find_all, 0);
|
|
rb_define_method(rb_mEnumerable, "reject", enum_reject, 0);
|
|
rb_define_method(rb_mEnumerable, "collect", enum_collect, 0);
|
|
rb_define_method(rb_mEnumerable, "map", enum_collect, 0);
|
|
rb_define_method(rb_mEnumerable, "flat_map", enum_flat_map, 0);
|
|
rb_define_method(rb_mEnumerable, "collect_concat", enum_flat_map, 0);
|
|
rb_define_method(rb_mEnumerable, "inject", enum_inject, -1);
|
|
rb_define_method(rb_mEnumerable, "reduce", enum_inject, -1);
|
|
rb_define_method(rb_mEnumerable, "partition", enum_partition, 0);
|
|
rb_define_method(rb_mEnumerable, "group_by", enum_group_by, 0);
|
|
rb_define_method(rb_mEnumerable, "first", enum_first, -1);
|
|
rb_define_method(rb_mEnumerable, "all?", enum_all, 0);
|
|
rb_define_method(rb_mEnumerable, "any?", enum_any, 0);
|
|
rb_define_method(rb_mEnumerable, "one?", enum_one, 0);
|
|
rb_define_method(rb_mEnumerable, "none?", enum_none, 0);
|
|
rb_define_method(rb_mEnumerable, "min", enum_min, -1);
|
|
rb_define_method(rb_mEnumerable, "max", enum_max, -1);
|
|
rb_define_method(rb_mEnumerable, "minmax", enum_minmax, 0);
|
|
rb_define_method(rb_mEnumerable, "min_by", enum_min_by, -1);
|
|
rb_define_method(rb_mEnumerable, "max_by", enum_max_by, -1);
|
|
rb_define_method(rb_mEnumerable, "minmax_by", enum_minmax_by, 0);
|
|
rb_define_method(rb_mEnumerable, "member?", enum_member, 1);
|
|
rb_define_method(rb_mEnumerable, "include?", enum_member, 1);
|
|
rb_define_method(rb_mEnumerable, "each_with_index", enum_each_with_index, -1);
|
|
rb_define_method(rb_mEnumerable, "reverse_each", enum_reverse_each, -1);
|
|
rb_define_method(rb_mEnumerable, "each_entry", enum_each_entry, -1);
|
|
rb_define_method(rb_mEnumerable, "each_slice", enum_each_slice, 1);
|
|
rb_define_method(rb_mEnumerable, "each_cons", enum_each_cons, 1);
|
|
rb_define_method(rb_mEnumerable, "each_with_object", enum_each_with_object, 1);
|
|
rb_define_method(rb_mEnumerable, "zip", enum_zip, -1);
|
|
rb_define_method(rb_mEnumerable, "take", enum_take, 1);
|
|
rb_define_method(rb_mEnumerable, "take_while", enum_take_while, 0);
|
|
rb_define_method(rb_mEnumerable, "drop", enum_drop, 1);
|
|
rb_define_method(rb_mEnumerable, "drop_while", enum_drop_while, 0);
|
|
rb_define_method(rb_mEnumerable, "cycle", enum_cycle, -1);
|
|
rb_define_method(rb_mEnumerable, "chunk", enum_chunk, -1);
|
|
rb_define_method(rb_mEnumerable, "slice_before", enum_slice_before, -1);
|
|
rb_define_method(rb_mEnumerable, "slice_after", enum_slice_after, -1);
|
|
rb_define_method(rb_mEnumerable, "slice_when", enum_slice_when, 0);
|
|
|
|
id_next = rb_intern("next");
|
|
id_call = rb_intern("call");
|
|
id_size = rb_intern("size");
|
|
id_div = rb_intern("div");
|
|
}
|