ruby/enum.c

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/**********************************************************************
enum.c -
$Author$
created at: Fri Oct 1 15:15:19 JST 1993
* encoding.c: provide basic features for M17N. * parse.y: encoding aware parsing. * parse.y (pragma_encoding): encoding specification pragma. * parse.y (rb_intern3): encoding specified symbols. * string.c (rb_str_length): length based on characters. for older behavior, bytesize method added. * string.c (rb_str_index_m): index based on characters. rindex as well. * string.c (succ_char): encoding aware succeeding string. * string.c (rb_str_reverse): reverse based on characters. * string.c (rb_str_inspect): encoding aware string description. * string.c (rb_str_upcase_bang): encoding aware case conversion. downcase, capitalize, swapcase as well. * string.c (rb_str_tr_bang): tr based on characters. delete, squeeze, tr_s, count as well. * string.c (rb_str_split_m): split based on characters. * string.c (rb_str_each_line): encoding aware each_line. * string.c (rb_str_each_char): added. iteration based on characters. * string.c (rb_str_strip_bang): encoding aware whitespace stripping. lstrip, rstrip as well. * string.c (rb_str_justify): encoding aware justifying (ljust, rjust, center). * string.c (str_encoding): get encoding attribute from a string. * re.c (rb_reg_initialize): encoding aware regular expression * sprintf.c (rb_str_format): formatting (i.e. length count) based on characters. * io.c (rb_io_getc): getc to return one-character string. for older behavior, getbyte method added. * ext/stringio/stringio.c (strio_getc): ditto. * io.c (rb_io_ungetc): allow pushing arbitrary string at the current reading point. * ext/stringio/stringio.c (strio_ungetc): ditto. * ext/strscan/strscan.c: encoding support. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13261 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2007-08-25 07:29:39 +04:00
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#include "ruby/ruby.h"
#include "ruby/util.h"
#include "node.h"
VALUE rb_mEnumerable;
static ID id_each, id_eqq, id_cmp, id_next, id_size;
static VALUE
enum_values_pack(int argc, VALUE *argv)
{
if (argc == 0) return Qnil;
if (argc == 1) return argv[0];
return rb_ary_new4(argc, argv);
}
#define ENUM_WANT_SVALUE() do { \
i = enum_values_pack(argc, argv); \
} while (0)
#define enum_yield rb_yield_values2
static VALUE
grep_i(VALUE i, VALUE args, int argc, VALUE *argv)
{
VALUE *arg = (VALUE *)args;
ENUM_WANT_SVALUE();
if (RTEST(rb_funcall(arg[0], id_eqq, 1, i))) {
rb_ary_push(arg[1], i);
}
return Qnil;
}
static VALUE
grep_iter_i(VALUE i, VALUE args, int argc, VALUE *argv)
{
VALUE *arg = (VALUE *)args;
ENUM_WANT_SVALUE();
if (RTEST(rb_funcall(arg[0], id_eqq, 1, i))) {
rb_ary_push(arg[1], rb_yield(i));
}
return Qnil;
}
/*
* call-seq:
* enum.grep(pattern) => array
* enum.grep(pattern) {| obj | block } => array
*
* Returns an array of every element in <i>enum</i> for which
* <code>Pattern === element</code>. If the optional <em>block</em> is
* supplied, each matching element is passed to it, and the block's
* result is stored in the output array.
*
* (1..100).grep 38..44 #=> [38, 39, 40, 41, 42, 43, 44]
* c = IO.constants
* c.grep(/SEEK/) #=> [:SEEK_SET, :SEEK_CUR, :SEEK_END]
* res = c.grep(/SEEK/) {|v| IO.const_get(v) }
* res #=> [0, 1, 2]
*
*/
static VALUE
enum_grep(VALUE obj, VALUE pat)
{
VALUE ary = rb_ary_new();
VALUE arg[2];
arg[0] = pat;
arg[1] = ary;
rb_block_call(obj, id_each, 0, 0, rb_block_given_p() ? grep_iter_i : grep_i, (VALUE)arg);
return ary;
}
static VALUE
count_i(VALUE i, VALUE memop, int argc, VALUE *argv)
{
VALUE *memo = (VALUE*)memop;
ENUM_WANT_SVALUE();
if (rb_equal(i, memo[1])) {
memo[0]++;
}
return Qnil;
}
static VALUE
count_iter_i(VALUE i, VALUE memop, int argc, VALUE *argv)
{
VALUE *memo = (VALUE*)memop;
if (RTEST(enum_yield(argc, argv))) {
memo[0]++;
}
return Qnil;
}
static VALUE
count_all_i(VALUE i, VALUE memop, int argc, VALUE *argv)
{
VALUE *memo = (VALUE*)memop;
memo[0]++;
return Qnil;
}
/*
* call-seq:
* enum.count => int
* enum.count(item) => int
* enum.count {| obj | block } => int
*
* Returns the number of items in <i>enum</i>, where #size is called
* if it responds to it, otherwise the items are counted through
* enumeration. If an argument is given, counts the number of items
* in <i>enum</i>, for which equals to <i>item</i>. If a block is
* given, counts the number of elements yielding a true value.
*
* ary = [1, 2, 4, 2]
* ary.count # => 4
* ary.count(2) # => 2
* ary.count{|x|x%2==0} # => 3
*
*/
static VALUE
enum_count(int argc, VALUE *argv, VALUE obj)
{
VALUE memo[2]; /* [count, condition value] */
rb_block_call_func *func;
if (argc == 0) {
if (rb_block_given_p()) {
func = count_iter_i;
}
else {
if (rb_respond_to(obj, id_size)) {
return rb_funcall(obj, id_size, 0, 0);
}
func = count_all_i;
}
}
else {
rb_scan_args(argc, argv, "1", &memo[1]);
if (rb_block_given_p()) {
rb_warn("given block not used");
}
func = count_i;
}
memo[0] = 0;
rb_block_call(obj, id_each, 0, 0, func, (VALUE)&memo);
return INT2NUM(memo[0]);
}
static VALUE
find_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
ENUM_WANT_SVALUE();
if (RTEST(rb_yield(i))) {
*memo = i;
rb_iter_break();
}
return Qnil;
}
/*
* call-seq:
* enum.detect(ifnone = nil) {| obj | block } => obj or nil
* enum.find(ifnone = nil) {| obj | block } => obj or nil
*
* Passes each entry in <i>enum</i> to <em>block</em>. Returns the
* first for which <em>block</em> is not <code>false</code>. If no
* object matches, calls <i>ifnone</i> and returns its result when it
* is specified, or returns <code>nil</code>
*
* (1..10).detect {|i| i % 5 == 0 and i % 7 == 0 } #=> nil
* (1..100).detect {|i| i % 5 == 0 and i % 7 == 0 } #=> 35
*
*/
static VALUE
enum_find(int argc, VALUE *argv, VALUE obj)
{
VALUE memo = Qundef;
VALUE if_none;
rb_scan_args(argc, argv, "01", &if_none);
RETURN_ENUMERATOR(obj, argc, argv);
rb_block_call(obj, id_each, 0, 0, find_i, (VALUE)&memo);
if (memo != Qundef) {
return memo;
}
if (!NIL_P(if_none)) {
return rb_funcall(if_none, rb_intern("call"), 0, 0);
}
return Qnil;
}
static VALUE
find_index_i(VALUE i, VALUE memop, int argc, VALUE *argv)
{
VALUE *memo = (VALUE*)memop;
ENUM_WANT_SVALUE();
if (rb_equal(i, memo[2])) {
memo[0] = UINT2NUM(memo[1]);
rb_iter_break();
}
memo[1]++;
return Qnil;
}
static VALUE
find_index_iter_i(VALUE i, VALUE memop, int argc, VALUE *argv)
{
VALUE *memo = (VALUE*)memop;
if (RTEST(enum_yield(argc, argv))) {
memo[0] = UINT2NUM(memo[1]);
rb_iter_break();
}
memo[1]++;
return Qnil;
}
/*
* call-seq:
* enum.find_index(value) => int or nil
* enum.find_index {| obj | block } => int or nil
*
* Compares each entry in <i>enum</i> with <em>value</em> or passes
* to <em>block</em>. Returns the index for the first for which the
* evaluated value is non-false. If no object matches, returns
* <code>nil</code>
*
* (1..10).find_index {|i| i % 5 == 0 and i % 7 == 0 } #=> nil
* (1..100).find_index {|i| i % 5 == 0 and i % 7 == 0 } #=> 34
* (1..100).find_index(50) #=> 49
*
*/
static VALUE
enum_find_index(int argc, VALUE *argv, VALUE obj)
{
VALUE memo[3]; /* [return value, current index, condition value] */
rb_block_call_func *func;
if (argc == 0) {
RETURN_ENUMERATOR(obj, 0, 0);
func = find_index_iter_i;
}
else {
rb_scan_args(argc, argv, "1", &memo[2]);
if (rb_block_given_p()) {
rb_warn("given block not used");
}
func = find_index_i;
}
memo[0] = Qnil;
memo[1] = 0;
rb_block_call(obj, id_each, 0, 0, func, (VALUE)memo);
return memo[0];
}
static VALUE
find_all_i(VALUE i, VALUE ary, int argc, VALUE *argv)
{
ENUM_WANT_SVALUE();
if (RTEST(rb_yield(i))) {
rb_ary_push(ary, i);
}
return Qnil;
}
/*
* call-seq:
* enum.find_all {| obj | block } => array
* enum.select {| obj | block } => array
*
* Returns an array containing all elements of <i>enum</i> for which
* <em>block</em> is not <code>false</code> (see also
* <code>Enumerable#reject</code>).
*
* (1..10).find_all {|i| i % 3 == 0 } #=> [3, 6, 9]
*
*/
static VALUE
enum_find_all(VALUE obj)
{
VALUE ary;
RETURN_ENUMERATOR(obj, 0, 0);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, find_all_i, ary);
return ary;
}
static VALUE
reject_i(VALUE i, VALUE ary, int argc, VALUE *argv)
{
ENUM_WANT_SVALUE();
if (!RTEST(rb_yield(i))) {
rb_ary_push(ary, i);
}
return Qnil;
}
/*
* call-seq:
* enum.reject {| obj | block } => array
*
* Returns an array for all elements of <i>enum</i> for which
* <em>block</em> is false (see also <code>Enumerable#find_all</code>).
*
* (1..10).reject {|i| i % 3 == 0 } #=> [1, 2, 4, 5, 7, 8, 10]
*
*/
static VALUE
enum_reject(VALUE obj)
{
VALUE ary;
RETURN_ENUMERATOR(obj, 0, 0);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, reject_i, ary);
return ary;
}
static VALUE
collect_i(VALUE i, VALUE ary, int argc, VALUE *argv)
{
rb_ary_push(ary, enum_yield(argc, argv));
return Qnil;
}
static VALUE
collect_all(VALUE i, VALUE ary, int argc, VALUE *argv)
{
rb_thread_check_ints();
rb_ary_push(ary, enum_values_pack(argc, argv));
return Qnil;
}
/*
* call-seq:
* enum.collect {| obj | block } => array
* enum.map {| obj | block } => array
*
* Returns a new array with the results of running <em>block</em> once
* for every element in <i>enum</i>.
*
* (1..4).collect {|i| i*i } #=> [1, 4, 9, 16]
* (1..4).collect { "cat" } #=> ["cat", "cat", "cat", "cat"]
*
*/
static VALUE
enum_collect(VALUE obj)
{
VALUE ary;
RETURN_ENUMERATOR(obj, 0, 0);
ary = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, collect_i, ary);
return ary;
}
/*
* call-seq:
* enum.to_a => array
* enum.entries => array
*
* Returns an array containing the items in <i>enum</i>.
*
* (1..7).to_a #=> [1, 2, 3, 4, 5, 6, 7]
* { 'a'=>1, 'b'=>2, 'c'=>3 }.to_a #=> [["a", 1], ["b", 2], ["c", 3]]
*/
static VALUE
enum_to_a(int argc, VALUE *argv, VALUE obj)
{
VALUE ary = rb_ary_new();
rb_block_call(obj, id_each, argc, argv, collect_all, ary);
OBJ_INFECT(ary, obj);
return ary;
}
static VALUE
inject_i(VALUE i, VALUE p, int argc, VALUE *argv)
{
VALUE *memo = (VALUE *)p;
ENUM_WANT_SVALUE();
if (memo[0] == Qundef) {
memo[0] = i;
}
else {
memo[0] = rb_yield_values(2, memo[0], i);
}
return Qnil;
}
static VALUE
inject_op_i(VALUE i, VALUE p, int argc, VALUE *argv)
{
VALUE *memo = (VALUE *)p;
ENUM_WANT_SVALUE();
if (memo[0] == Qundef) {
memo[0] = i;
}
else {
memo[0] = rb_funcall(memo[0], (ID)memo[1], 1, i);
}
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 fo the method.
*
* If you do not explicitly specify an <i>initial</i> value for <i>memo</i>,
* then uses the first element of collection is used as the initial value
* of <i>memo</i>.
*
* Examples:
*
* # 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)
{
VALUE memo[2];
VALUE (*iter)(VALUE, VALUE, int, VALUE*) = inject_i;
switch (rb_scan_args(argc, argv, "02", &memo[0], &memo[1])) {
case 0:
memo[0] = Qundef;
break;
case 1:
if (rb_block_given_p()) {
break;
}
memo[1] = (VALUE)rb_to_id(memo[0]);
memo[0] = Qundef;
iter = inject_op_i;
break;
case 2:
if (rb_block_given_p()) {
rb_warning("given block not used");
}
memo[1] = (VALUE)rb_to_id(memo[1]);
iter = inject_op_i;
break;
}
rb_block_call(obj, id_each, 0, 0, iter, (VALUE)memo);
if (memo[0] == Qundef) return Qnil;
return memo[0];
}
static VALUE
partition_i(VALUE i, VALUE *ary, int argc, VALUE *argv)
{
ENUM_WANT_SVALUE();
if (RTEST(rb_yield(i))) {
rb_ary_push(ary[0], i);
}
else {
rb_ary_push(ary[1], i);
}
return Qnil;
}
/*
* call-seq:
* enum.partition {| obj | block } => [ true_array, false_array ]
*
* Returns two arrays, the first containing the elements of
* <i>enum</i> for which the block evaluates to true, the second
* containing the rest.
*
* (1..6).partition {|i| (i&1).zero?} #=> [[2, 4, 6], [1, 3, 5]]
*
*/
static VALUE
enum_partition(VALUE obj)
{
VALUE ary[2];
RETURN_ENUMERATOR(obj, 0, 0);
ary[0] = rb_ary_new();
ary[1] = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, partition_i, (VALUE)ary);
return rb_assoc_new(ary[0], ary[1]);
}
static VALUE
group_by_i(VALUE i, VALUE hash, int argc, VALUE *argv)
{
VALUE group;
VALUE values;
ENUM_WANT_SVALUE();
group = rb_yield(i);
values = rb_hash_aref(hash, group);
if (NIL_P(values)) {
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
*
* Returns a hash, which keys are evaluated result from the
* block, and values are arrays of elements in <i>enum</i>
* corresponding to the key.
*
* (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_ENUMERATOR(obj, 0, 0);
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(VALUE i, VALUE *params, int argc, VALUE *argv)
{
ENUM_WANT_SVALUE();
if (NIL_P(params[1])) {
params[1] = i;
rb_iter_break();
}
else {
long n = params[0];
rb_ary_push(params[1], i);
n--;
if (n <= 0) {
rb_iter_break();
}
params[0] = n;
}
return Qnil;
}
/*
* 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.
*
*/
static VALUE
enum_first(int argc, VALUE *argv, VALUE obj)
{
VALUE n, params[2];
if (argc == 0) {
params[0] = params[1] = Qnil;
}
else {
long len;
rb_scan_args(argc, argv, "01", &n);
len = NUM2LONG(n);
if (len == 0) return rb_ary_new2(0);
if (len < 0) {
rb_raise(rb_eArgError, "negative length");
}
params[0] = len;
params[1] = rb_ary_new2(len);
}
rb_block_call(obj, id_each, 0, 0, first_i, (VALUE)params);
return params[1];
}
/*
* 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));
}
static VALUE
sort_by_i(VALUE i, VALUE ary, int argc, VALUE *argv)
{
NODE *memo;
ENUM_WANT_SVALUE();
if (RBASIC(ary)->klass) {
rb_raise(rb_eRuntimeError, "sort_by reentered");
}
/* use NODE_DOT2 as memo(v, v, -) */
memo = rb_node_newnode(NODE_DOT2, rb_yield(i), i, 0);
rb_ary_push(ary, (VALUE)memo);
return Qnil;
}
static int
sort_by_cmp(const void *ap, const void *bp, void *data)
{
VALUE a = (*(NODE *const *)ap)->u1.value;
VALUE b = (*(NODE *const *)bp)->u1.value;
VALUE ary = (VALUE)data;
* array.c (rb_ary_modify): should copy the internal buffer if the modifying buffer is shared. * array.c (ary_make_shared): make an internal buffer of an array to be shared. * array.c (rb_ary_shift): avoid sliding an internal buffer by using shared buffer. * array.c (rb_ary_subseq): avoid copying the buffer. * parse.y (gettable): should freeze __LINE__ string. * io.c (rb_io_puts): old behavoir restored. rationale: a) if you want to call to_s for arrays, you can just call print a, "\n". b) to_s wastes memory if array (and sum of its contents) is huge. c) now any object that has to_ary is treated as an array, using rb_check_convert_type(). * hash.c (rb_hash_initialize): now accepts a block to calculate the default value. [new] * hash.c (rb_hash_aref): call "default" method to get the value corrensponding to the non existing key. * hash.c (rb_hash_default): get the default value based on the block given to 'new'. Now it takes an optinal "key" argument. "default" became the method to get the value for non existing key. Users may override "default" method to change the hash behavior. * hash.c (rb_hash_set_default): clear the flag if a block is given to 'new' * object.c (Init_Object): undef Data.allocate, left Data.new. * ext/curses/curses.c (window_scrollok): use RTEST(). * ext/curses/curses.c (window_idlok): ditto. * ext/curses/curses.c (window_keypad): ditto. * ext/curses/curses.c (window_idlok): idlok() may return void on some platforms; so don't use return value. * ext/curses/curses.c (window_scrollok): ditto for consistency. * ext/curses/curses.c: replace FIX2INT() by typechecking NUM2INT(). * parse.y (str_extend): should not process immature #$x and #@x interpolation, e.g #@#@ etc. * enum.c (enum_sort_by): sort_by does not have to be stable always. * enum.c (enum_sort_by): call qsort directly to gain performance. * util.c (ruby_qsort): ruby_qsort(qs6) is now native thread safe. * error.c (rb_sys_fail): it must be a bug if it's called when errno == 0. * regex.c (WC2MBC1ST): should not pass through > 0x80 number in UTF-8. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1896 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2001-12-10 10:18:16 +03:00
if (RBASIC(ary)->klass) {
rb_raise(rb_eRuntimeError, "sort_by reentered");
}
return rb_cmpint(rb_funcall(a, id_cmp, 1, b), a, b);
}
/*
* call-seq:
* enum.sort_by {| obj | block } => array
*
* Sorts <i>enum</i> using a set of keys generated by mapping the
* values in <i>enum</i> through the given block.
*
* %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'
* include Benchmark
*
* a = (1..100000).map {rand(100000)}
*
* 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)
{
* array.c (rb_ary_modify): should copy the internal buffer if the modifying buffer is shared. * array.c (ary_make_shared): make an internal buffer of an array to be shared. * array.c (rb_ary_shift): avoid sliding an internal buffer by using shared buffer. * array.c (rb_ary_subseq): avoid copying the buffer. * parse.y (gettable): should freeze __LINE__ string. * io.c (rb_io_puts): old behavoir restored. rationale: a) if you want to call to_s for arrays, you can just call print a, "\n". b) to_s wastes memory if array (and sum of its contents) is huge. c) now any object that has to_ary is treated as an array, using rb_check_convert_type(). * hash.c (rb_hash_initialize): now accepts a block to calculate the default value. [new] * hash.c (rb_hash_aref): call "default" method to get the value corrensponding to the non existing key. * hash.c (rb_hash_default): get the default value based on the block given to 'new'. Now it takes an optinal "key" argument. "default" became the method to get the value for non existing key. Users may override "default" method to change the hash behavior. * hash.c (rb_hash_set_default): clear the flag if a block is given to 'new' * object.c (Init_Object): undef Data.allocate, left Data.new. * ext/curses/curses.c (window_scrollok): use RTEST(). * ext/curses/curses.c (window_idlok): ditto. * ext/curses/curses.c (window_keypad): ditto. * ext/curses/curses.c (window_idlok): idlok() may return void on some platforms; so don't use return value. * ext/curses/curses.c (window_scrollok): ditto for consistency. * ext/curses/curses.c: replace FIX2INT() by typechecking NUM2INT(). * parse.y (str_extend): should not process immature #$x and #@x interpolation, e.g #@#@ etc. * enum.c (enum_sort_by): sort_by does not have to be stable always. * enum.c (enum_sort_by): call qsort directly to gain performance. * util.c (ruby_qsort): ruby_qsort(qs6) is now native thread safe. * error.c (rb_sys_fail): it must be a bug if it's called when errno == 0. * regex.c (WC2MBC1ST): should not pass through > 0x80 number in UTF-8. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1896 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2001-12-10 10:18:16 +03:00
VALUE ary;
long i;
RETURN_ENUMERATOR(obj, 0, 0);
if (TYPE(obj) == T_ARRAY) {
ary = rb_ary_new2(RARRAY_LEN(obj));
}
else {
ary = rb_ary_new();
}
RBASIC(ary)->klass = 0;
rb_block_call(obj, id_each, 0, 0, sort_by_i, ary);
if (RARRAY_LEN(ary) > 1) {
ruby_qsort(RARRAY_PTR(ary), RARRAY_LEN(ary), sizeof(VALUE),
sort_by_cmp, (void *)ary);
}
if (RBASIC(ary)->klass) {
rb_raise(rb_eRuntimeError, "sort_by reentered");
}
for (i=0; i<RARRAY_LEN(ary); i++) {
RARRAY_PTR(ary)[i] = RNODE(RARRAY_PTR(ary)[i])->u2.value;
}
RBASIC(ary)->klass = rb_cArray;
OBJ_INFECT(ary, obj);
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, VALUE *memo); \
\
static VALUE \
name##_i(VALUE i, VALUE *memo, int argc, VALUE *argv) \
{ \
return enum_##name##_func(enum_values_pack(argc, argv), memo); \
} \
\
static VALUE \
name##_iter_i(VALUE i, VALUE *memo, int argc, VALUE *argv) \
{ \
return enum_##name##_func(enum_yield(argc, argv), memo); \
} \
\
static VALUE \
enum_##name##_func(VALUE result, VALUE *memo)
DEFINE_ENUMFUNCS(all)
{
if (!RTEST(result)) {
*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> (that is
* <code>all?</code> will return <code>true</code> only if none of the
* collection members are <code>false</code> or <code>nil</code>.)
*
* %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)
{
VALUE result = Qtrue;
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(all), (VALUE)&result);
return result;
}
DEFINE_ENUMFUNCS(any)
{
if (RTEST(result)) {
*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
* is <code>any?</code> will return <code>true</code> if at least one
* of the collection members is not <code>false</code> or
* <code>nil</code>.
*
* %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)
{
VALUE result = Qfalse;
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(any), (VALUE)&result);
return result;
}
DEFINE_ENUMFUNCS(one)
{
if (RTEST(result)) {
if (*memo == Qundef) {
*memo = Qtrue;
}
else if (*memo == Qtrue) {
*memo = Qfalse;
rb_iter_break();
}
}
return Qnil;
}
/*
* 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)
{
VALUE result = Qundef;
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(one), (VALUE)&result);
if (result == Qundef) return Qfalse;
return result;
}
DEFINE_ENUMFUNCS(none)
{
if (RTEST(result)) {
*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)
{
VALUE result = Qtrue;
rb_block_call(obj, id_each, 0, 0, ENUMFUNC(none), (VALUE)&result);
return result;
}
static VALUE
min_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
VALUE cmp;
ENUM_WANT_SVALUE();
if (*memo == Qundef) {
*memo = i;
}
else {
cmp = rb_funcall(i, id_cmp, 1, *memo);
if (rb_cmpint(cmp, i, *memo) < 0) {
*memo = i;
}
}
return Qnil;
}
static VALUE
min_ii(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
VALUE cmp;
ENUM_WANT_SVALUE();
if (*memo == Qundef) {
*memo = i;
}
else {
VALUE ary = memo[1];
RARRAY_PTR(ary)[0] = i;
RARRAY_PTR(ary)[1] = *memo;
cmp = rb_yield(ary);
if (rb_cmpint(cmp, i, *memo) < 0) {
*memo = i;
}
}
return Qnil;
}
/*
* call-seq:
* enum.min => obj
* enum.min {| a,b | block } => obj
*
* 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"
*/
static VALUE
enum_min(VALUE obj)
{
VALUE result[2];
result[0] = Qundef;
if (rb_block_given_p()) {
result[1] = rb_ary_new3(2, Qnil, Qnil);
rb_block_call(obj, id_each, 0, 0, min_ii, (VALUE)result);
}
else {
rb_block_call(obj, id_each, 0, 0, min_i, (VALUE)result);
}
if (result[0] == Qundef) return Qnil;
return result[0];
}
static VALUE
max_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
VALUE cmp;
ENUM_WANT_SVALUE();
if (*memo == Qundef) {
*memo = i;
}
else {
cmp = rb_funcall(i, id_cmp, 1, *memo);
if (rb_cmpint(cmp, i, *memo) > 0) {
*memo = i;
}
}
return Qnil;
}
static VALUE
max_ii(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
VALUE cmp;
ENUM_WANT_SVALUE();
if (*memo == Qundef) {
*memo = i;
}
else {
VALUE ary = memo[1];
RARRAY_PTR(ary)[0] = i;
RARRAY_PTR(ary)[1] = *memo;
cmp = rb_yield(ary);
if (rb_cmpint(cmp, i, *memo) > 0) {
*memo = i;
}
}
return Qnil;
}
/*
* call-seq:
* enum.max => obj
* enum.max {|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"
*/
static VALUE
enum_max(VALUE obj)
{
VALUE result[2];
result[0] = Qundef;
if (rb_block_given_p()) {
result[1] = rb_ary_new3(2, Qnil, Qnil);
rb_block_call(obj, id_each, 0, 0, max_ii, (VALUE)result);
}
else {
rb_block_call(obj, id_each, 0, 0, max_i, (VALUE)result);
}
if (result[0] == Qundef) return Qnil;
return result[0];
}
static VALUE
minmax_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
int n;
ENUM_WANT_SVALUE();
if (memo[0] == Qundef) {
memo[0] = i;
memo[1] = i;
}
else {
n = rb_cmpint(rb_funcall(i, id_cmp, 1, memo[0]), i, memo[0]);
if (n < 0) {
memo[0] = i;
}
n = rb_cmpint(rb_funcall(i, id_cmp, 1, memo[1]), i, memo[1]);
if (n > 0) {
memo[1] = i;
}
}
return Qnil;
}
static VALUE
minmax_ii(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
int n;
ENUM_WANT_SVALUE();
if (memo[0] == Qundef) {
memo[0] = i;
memo[1] = i;
}
else {
VALUE ary = memo[2];
RARRAY_PTR(ary)[0] = i;
RARRAY_PTR(ary)[1] = memo[0];
n = rb_cmpint(rb_yield(ary), i, memo[0]);
if (n < 0) {
memo[0] = i;
}
RARRAY_PTR(ary)[0] = i;
RARRAY_PTR(ary)[1] = memo[1];
n = rb_cmpint(rb_yield(ary), i, memo[1]);
if (n > 0) {
memo[1] = i;
}
}
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)
{
VALUE result[3];
VALUE ary = rb_ary_new3(2, Qnil, Qnil);
result[0] = Qundef;
if (rb_block_given_p()) {
result[2] = ary;
rb_block_call(obj, id_each, 0, 0, minmax_ii, (VALUE)result);
}
else {
rb_block_call(obj, id_each, 0, 0, minmax_i, (VALUE)result);
}
if (result[0] != Qundef) {
RARRAY_PTR(ary)[0] = result[0];
RARRAY_PTR(ary)[1] = result[1];
}
return ary;
}
static VALUE
min_by_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
VALUE v;
ENUM_WANT_SVALUE();
v = rb_yield(i);
if (memo[0] == Qundef) {
memo[0] = v;
memo[1] = i;
}
else if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo[0]), v, memo[0]) < 0) {
memo[0] = v;
memo[1] = i;
}
return Qnil;
}
/*
* call-seq:
* enum.min_by {| obj| block } => obj
*
* Returns the object in <i>enum</i> that gives the minimum
* value from the given block.
*
* a = %w(albatross dog horse)
* a.min_by {|x| x.length } #=> "dog"
*/
static VALUE
enum_min_by(VALUE obj)
{
VALUE memo[2];
RETURN_ENUMERATOR(obj, 0, 0);
memo[0] = Qundef;
memo[1] = Qnil;
rb_block_call(obj, id_each, 0, 0, min_by_i, (VALUE)memo);
return memo[1];
}
static VALUE
max_by_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
VALUE v;
ENUM_WANT_SVALUE();
v = rb_yield(i);
if (memo[0] == Qundef) {
memo[0] = v;
memo[1] = i;
}
else if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo[0]), v, memo[0]) > 0) {
memo[0] = v;
memo[1] = i;
}
return Qnil;
}
/*
* call-seq:
* enum.max_by {| obj| block } => obj
*
* Returns the object in <i>enum</i> that gives the maximum
* value from the given block.
*
* a = %w(albatross dog horse)
* a.max_by {|x| x.length } #=> "albatross"
*/
static VALUE
enum_max_by(VALUE obj)
{
VALUE memo[2];
RETURN_ENUMERATOR(obj, 0, 0);
memo[0] = Qundef;
memo[1] = Qnil;
rb_block_call(obj, id_each, 0, 0, max_by_i, (VALUE)memo);
return memo[1];
}
static VALUE
minmax_by_i(VALUE i, VALUE *memo, int argc, VALUE *argv)
{
VALUE v;
ENUM_WANT_SVALUE();
v = rb_yield(i);
if (memo[0] == Qundef) {
memo[0] = v;
memo[1] = v;
memo[2] = i;
memo[3] = i;
}
else {
if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo[0]), v, memo[0]) < 0) {
memo[0] = v;
memo[2] = i;
}
if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo[1]), v, memo[1]) > 0) {
memo[1] = v;
memo[3] = i;
}
}
return Qnil;
}
/*
* call-seq:
* enum.minmax_by {| obj| block } => [min, max]
*
* Returns two elements array array containing the objects in
* <i>enum</i> that gives the minimum and maximum values respectively
* from the given block.
*
* a = %w(albatross dog horse)
* a.minmax_by {|x| x.length } #=> ["dog", "albatross"]
*/
static VALUE
enum_minmax_by(VALUE obj)
{
VALUE memo[4];
RETURN_ENUMERATOR(obj, 0, 0);
memo[0] = Qundef;
memo[1] = Qundef;
memo[2] = Qnil;
memo[3] = Qnil;
rb_block_call(obj, id_each, 0, 0, minmax_by_i, (VALUE)memo);
return rb_assoc_new(memo[2], memo[3]);
}
static VALUE
member_i(VALUE iter, VALUE *memo, int argc, VALUE *argv)
{
if (rb_equal(enum_values_pack(argc, argv), memo[0])) {
memo[1] = 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)
{
VALUE memo[2];
memo[0] = val;
memo[1] = Qfalse;
rb_block_call(obj, id_each, 0, 0, member_i, (VALUE)memo);
return memo[1];
}
static VALUE
each_with_index_i(VALUE i, VALUE memo, int argc, VALUE *argv)
{
long n = (*(VALUE *)memo)++;
return rb_yield_values(2, enum_values_pack(argc, argv), INT2NUM(n));
}
/*
* call-seq:
* enum.each_with_index {|obj, i| block } -> enum
*
* 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().
*
* 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)
{
long memo;
RETURN_ENUMERATOR(obj, argc, argv);
memo = 0;
rb_block_call(obj, id_each, argc, argv, each_with_index_i, (VALUE)&memo);
return obj;
}
/*
* call-seq:
* enum.reverse_each {|item| block }
*
* Traverses <i>enum</i> in reverse order.
*/
static VALUE
enum_reverse_each(int argc, VALUE *argv, VALUE obj)
{
VALUE ary;
long i;
RETURN_ENUMERATOR(obj, argc, argv);
ary = enum_to_a(argc, argv, obj);
for (i = RARRAY_LEN(ary); --i >= 0; ) {
rb_yield(RARRAY_PTR(ary)[i]);
}
return obj;
}
static VALUE
zip_ary(VALUE val, NODE *memo, int argc, VALUE *argv)
{
volatile VALUE result = memo->u1.value;
volatile VALUE args = memo->u2.value;
long n = memo->u3.cnt++;
volatile VALUE tmp;
int i;
tmp = rb_ary_new2(RARRAY_LEN(args) + 1);
rb_ary_store(tmp, 0, enum_values_pack(argc, argv));
for (i=0; i<RARRAY_LEN(args); i++) {
VALUE e = RARRAY_PTR(args)[i];
if (RARRAY_LEN(e) <= n) {
rb_ary_push(tmp, Qnil);
}
else {
rb_ary_push(tmp, RARRAY_PTR(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_funcall(v[1], id_next, 0, 0);
}
static VALUE
call_stop(VALUE *v)
{
return v[0] = Qundef;
}
static VALUE
zip_i(VALUE val, NODE *memo, int argc, VALUE *argv)
{
volatile VALUE result = memo->u1.value;
volatile VALUE args = memo->u2.value;
volatile VALUE tmp;
int i;
tmp = rb_ary_new2(RARRAY_LEN(args) + 1);
rb_ary_store(tmp, 0, enum_values_pack(argc, argv));
for (i=0; i<RARRAY_LEN(args); i++) {
if (NIL_P(RARRAY_PTR(args)[i])) {
rb_ary_push(tmp, Qnil);
}
else {
VALUE v[2];
v[1] = RARRAY_PTR(args)[i];
rb_rescue2(call_next, (VALUE)v, call_stop, (VALUE)v, rb_eStopIteration, 0);
if (v[0] == Qundef) {
RARRAY_PTR(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, ...) => enumerator
* 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 ]
*
* [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;
NODE *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++) {
argv[i] = rb_funcall(argv[i], conv, 1, ID2SYM(id_each));
}
}
if (!rb_block_given_p()) {
result = rb_ary_new();
}
/* use NODE_DOT2 as memo(v, v, -) */
memo = rb_node_newnode(NODE_DOT2, result, args, 0);
rb_block_call(obj, id_each, 0, 0, allary ? zip_ary : zip_i, (VALUE)memo);
return result;
}
static VALUE
take_i(VALUE i, VALUE *arg, int argc, VALUE *argv)
{
rb_ary_push(arg[0], enum_values_pack(argc, argv));
if (--arg[1] == 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]
*
*/
static VALUE
enum_take(VALUE obj, VALUE n)
{
VALUE args[2];
long len = NUM2LONG(n);
if (len < 0) {
rb_raise(rb_eArgError, "attempt to take negative size");
}
if (len == 0) return rb_ary_new2(0);
args[0] = rb_ary_new();
args[1] = len;
rb_block_call(obj, id_each, 0, 0, take_i, (VALUE)args);
return args[0];
}
static VALUE
take_while_i(VALUE i, VALUE *ary, int argc, VALUE *argv)
{
if (!RTEST(enum_yield(argc, argv))) rb_iter_break();
rb_ary_push(*ary, enum_values_pack(argc, argv));
return Qnil;
}
/*
* call-seq:
* enum.take_while {|arr| block } => array
*
* Passes elements to the block until the block returns nil or false,
* then stops iterating and returns an array of all prior elements.
*
* 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, (VALUE)&ary);
return ary;
}
static VALUE
drop_i(VALUE i, VALUE *arg, int argc, VALUE *argv)
{
if (arg[1] == 0) {
rb_ary_push(arg[0], enum_values_pack(argc, argv));
}
else {
arg[1]--;
}
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 args[2];
long len = NUM2LONG(n);
if (len < 0) {
rb_raise(rb_eArgError, "attempt to drop negative size");
}
args[1] = len;
args[0] = rb_ary_new();
rb_block_call(obj, id_each, 0, 0, drop_i, (VALUE)args);
return args[0];
}
static VALUE
drop_while_i(VALUE i, VALUE *args, int argc, VALUE *argv)
{
ENUM_WANT_SVALUE();
if (!args[1] && !RTEST(rb_yield(i))) {
args[1] = Qtrue;
}
if (args[1]) {
rb_ary_push(args[0], i);
}
return Qnil;
}
/*
* call-seq:
* enum.drop_while {|arr| block } => array
*
* 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.
*
* 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 args[2];
RETURN_ENUMERATOR(obj, 0, 0);
args[0] = rb_ary_new();
args[1] = Qfalse;
rb_block_call(obj, id_each, 0, 0, drop_while_i, (VALUE)args);
return args[0];
}
static VALUE
cycle_i(VALUE i, VALUE ary, int argc, VALUE *argv)
{
ENUM_WANT_SVALUE();
rb_ary_push(ary, i);
rb_yield(i);
return Qnil;
}
/*
* call-seq:
* enum.cycle {|obj| block }
* enum.cycle(n) {|obj| block }
*
* 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.
*
* 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_ENUMERATOR(obj, argc, argv);
if (NIL_P(nv)) {
n = -1;
}
else {
n = NUM2LONG(nv);
if (n <= 0) return Qnil;
}
ary = rb_ary_new();
RBASIC(ary)->klass = 0;
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_PTR(ary)[i]);
}
}
return Qnil; /* not reached */
}
/*
* call-seq:
* enum.join(sep=$,) -> str
*
* Returns a string created by converting each element of the
* <i>enum</i> to a string, separated by <i>sep</i>.
*/
static VALUE
enum_join(int argc, VALUE *argv, VALUE obj)
{
VALUE sep;
rb_scan_args(argc, argv, "01", &sep);
if (NIL_P(sep)) sep = rb_output_fs;
return rb_ary_join(enum_to_a(0, 0, obj), sep);
}
/*
* 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, "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, "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, 0);
rb_define_method(rb_mEnumerable, "max", enum_max, 0);
rb_define_method(rb_mEnumerable, "minmax", enum_minmax, 0);
rb_define_method(rb_mEnumerable, "min_by", enum_min_by, 0);
rb_define_method(rb_mEnumerable, "max_by", enum_max_by, 0);
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, "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, "join", enum_join, -1);
id_eqq = rb_intern("===");
id_each = rb_intern("each");
id_cmp = rb_intern("<=>");
id_next = rb_intern("next");
id_size = rb_intern("size");
}