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ruby/enum.c

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/**********************************************************************
enum.c -
$Author$
$Date$
created at: Fri Oct 1 15:15:19 JST 1993
Copyright (C) 1993-2003 Yukihiro Matsumoto
**********************************************************************/
#include "ruby.h"
#include "node.h"
#include "util.h"
VALUE rb_mEnumerable;
static ID id_each, id_eqq, id_cmp;
VALUE
rb_each(obj)
VALUE obj;
{
return rb_funcall(obj, id_each, 0, 0);
}
static VALUE
grep_i(i, arg)
VALUE i, *arg;
{
if (RTEST(rb_funcall(arg[0], id_eqq, 1, i))) {
rb_ary_push(arg[1], i);
}
return Qnil;
}
static VALUE
grep_iter_i(i, arg)
VALUE i, *arg;
{
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_END", "SEEK_SET", "SEEK_CUR"]
* res = c.grep(/SEEK/) {|v| IO.const_get(v) }
* res #=> [2, 0, 1]
*
*/
static VALUE
enum_grep(obj, pat)
VALUE obj, pat;
{
VALUE ary = rb_ary_new();
VALUE arg[2];
arg[0] = pat;
arg[1] = ary;
rb_iterate(rb_each, obj, rb_block_given_p() ? grep_iter_i : grep_i, (VALUE)arg);
return ary;
}
static VALUE
find_i(i, memo)
VALUE i;
NODE *memo;
{
if (RTEST(rb_yield(i))) {
memo->u2.value = Qtrue;
memo->u1.value = 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(argc, argv, obj)
int argc;
VALUE* argv;
VALUE obj;
{
NODE *memo = rb_node_newnode(NODE_MEMO, Qnil, Qfalse, 0);
VALUE if_none;
rb_scan_args(argc, argv, "01", &if_none);
rb_iterate(rb_each, obj, find_i, (VALUE)memo);
if (memo->u2.value) {
VALUE result = memo->u1.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
rb_gc_force_recycle((VALUE)memo);
if (!NIL_P(if_none)) {
return rb_funcall(if_none, rb_intern("call"), 0, 0);
}
return Qnil;
}
static VALUE
find_all_i(i, ary)
VALUE i, ary;
{
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(obj)
VALUE obj;
{
VALUE ary = rb_ary_new();
rb_iterate(rb_each, obj, find_all_i, ary);
return ary;
}
static VALUE
reject_i(i, ary)
VALUE i, ary;
{
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(obj)
VALUE obj;
{
VALUE ary = rb_ary_new();
rb_iterate(rb_each, obj, reject_i, ary);
return ary;
}
static VALUE
collect_i(i, ary)
VALUE i, ary;
{
rb_ary_push(ary, rb_yield(i));
return Qnil;
}
static VALUE
collect_all(i, ary)
VALUE i, ary;
{
rb_ary_push(ary, i);
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(obj)
VALUE obj;
{
VALUE ary = rb_ary_new();
rb_iterate(rb_each, obj, rb_block_given_p() ? collect_i : collect_all, 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(obj)
VALUE obj;
{
VALUE ary = rb_ary_new();
rb_iterate(rb_each, obj, collect_all, ary);
return ary;
}
static VALUE
inject_i(i, memo)
VALUE i;
NODE *memo;
{
if (memo->u2.value) {
memo->u2.value = Qfalse;
memo->u1.value = i;
}
else {
memo->u1.value = rb_yield_values(2, memo->u1.value, i);
}
return Qnil;
}
/*
* call-seq:
* enum.inject(initial) {| memo, obj | block } => obj
* enum.inject {| memo, obj | block } => obj
*
* Combines the elements of <i>enum</i> by applying the block to an
* accumulator value (<i>memo</i>) and each element in turn. At each
* step, <i>memo</i> is set to the value returned by the block. The
* first form lets you supply an initial value for <i>memo</i>. The
* second form uses the first element of the collection as a the
* initial value (and skips that element while iterating).
*
* # Sum some numbers
* (5..10).inject {|sum, n| sum + n } #=> 45
* # Multiply some numbers
* (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"
*
* # find the length of the longest word
* longest = %w{ cat sheep bear }.inject(0) do |memo,word|
* memo >= word.length ? memo : word.length
* end
* longest #=> 5
*
*/
static VALUE
enum_inject(argc, argv, obj)
int argc;
VALUE *argv, obj;
{
NODE *memo;
VALUE n;
if (rb_scan_args(argc, argv, "01", &n) == 1) {
memo = rb_node_newnode(NODE_MEMO, n, Qfalse, 0);
}
else {
memo = rb_node_newnode(NODE_MEMO, Qnil, Qtrue, 0);
}
rb_iterate(rb_each, obj, inject_i, (VALUE)memo);
n = memo->u1.value;
rb_gc_force_recycle((VALUE)memo);
return n;
}
static VALUE
partition_i(i, ary)
VALUE i, *ary;
{
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(obj)
VALUE obj;
{
VALUE ary[2];
ary[0] = rb_ary_new();
ary[1] = rb_ary_new();
rb_iterate(rb_each, obj, partition_i, (VALUE)ary);
return rb_assoc_new(ary[0], ary[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(obj)
VALUE obj;
{
return rb_ary_sort(enum_to_a(obj));
}
static VALUE
sort_by_i(i, ary)
VALUE i, ary;
{
VALUE v, e;
v = rb_yield(i);
e = rb_assoc_new(v, i);
rb_ary_push(ary, e);
return Qnil;
}
static int
sort_by_cmp(a, b)
VALUE *a, *b;
{
VALUE retval;
retval = rb_funcall(RARRAY(*a)->ptr[0], id_cmp, 1, RARRAY(*b)->ptr[0]);
return rb_cmpint(retval, *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(obj)
VALUE obj;
{
VALUE ary;
long i;
if (TYPE(obj) == T_ARRAY) {
ary = rb_ary_new2(RARRAY(obj)->len);
}
else {
ary = rb_ary_new();
}
rb_iterate(rb_each, obj, sort_by_i, ary);
if (RARRAY(ary)->len > 1) {
qsort(RARRAY(ary)->ptr, RARRAY(ary)->len, sizeof(VALUE), sort_by_cmp);
}
for (i=0; i<RARRAY(ary)->len; i++) {
VALUE e = RARRAY(ary)->ptr[i];
RARRAY(ary)->ptr[i] = RARRAY(e)->ptr[1];
}
return ary;
}
static VALUE
all_iter_i(i, memo)
VALUE i;
NODE *memo;
{
if (!RTEST(rb_yield(i))) {
memo->u1.value = Qfalse;
rb_iter_break();
}
return Qnil;
}
static VALUE
all_i(i, memo)
VALUE i;
NODE *memo;
{
if (!RTEST(i)) {
memo->u1.value = 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(obj)
VALUE obj;
{
VALUE result;
NODE *memo = rb_node_newnode(NODE_MEMO, Qnil, 0, 0);
memo->u1.value = Qtrue;
rb_iterate(rb_each, obj, rb_block_given_p() ? all_iter_i : all_i, (VALUE)memo);
result = memo->u1.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
static VALUE
any_iter_i(i, memo)
VALUE i;
NODE *memo;
{
if (RTEST(rb_yield(i))) {
memo->u1.value = Qtrue;
rb_iter_break();
}
return Qnil;
}
static VALUE
any_i(i, memo)
VALUE i;
NODE *memo;
{
if (RTEST(i)) {
memo->u1.value = 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
* that <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(obj)
VALUE obj;
{
VALUE result;
NODE *memo = rb_node_newnode(NODE_MEMO, Qnil, 0, 0);
memo->u1.value = Qfalse;
rb_iterate(rb_each, obj, rb_block_given_p() ? any_iter_i : any_i, (VALUE)memo);
result = memo->u1.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
static VALUE
min_i(i, memo)
VALUE i;
NODE *memo;
{
VALUE cmp;
if (NIL_P(memo->u1.value)) {
memo->u1.value = i;
}
else {
cmp = rb_funcall(i, id_cmp, 1, memo->u1.value);
if (rb_cmpint(cmp, i, memo->u1.value) < 0) {
memo->u1.value = i;
}
}
return Qnil;
}
static VALUE
min_ii(i, memo)
VALUE i;
NODE *memo;
{
VALUE cmp;
if (NIL_P(memo->u1.value)) {
memo->u1.value = i;
}
else {
cmp = rb_yield_values(2, i, memo->u1.value);
if (rb_cmpint(cmp, i, memo->u1.value) < 0) {
memo->u1.value = 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(obj)
VALUE obj;
{
VALUE result;
NODE *memo = rb_node_newnode(NODE_MEMO, Qnil, 0, 0);
rb_iterate(rb_each, obj, rb_block_given_p() ? min_ii : min_i, (VALUE)memo);
result = memo->u1.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
static VALUE
max_i(i, memo)
VALUE i;
NODE *memo;
{
VALUE cmp;
if (NIL_P(memo->u1.value)) {
memo->u1.value = i;
}
else {
cmp = rb_funcall(i, id_cmp, 1, memo->u1.value);
if (rb_cmpint(cmp, i, memo->u1.value) > 0) {
memo->u1.value = i;
}
}
return Qnil;
}
static VALUE
max_ii(i, memo)
VALUE i;
NODE *memo;
{
VALUE cmp;
if (NIL_P(memo->u1.value)) {
memo->u1.value = i;
}
else {
cmp = rb_yield_values(2, i, memo->u1.value);
if (rb_cmpint(cmp, i, memo->u1.value) > 0) {
memo->u1.value = 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(obj)
VALUE obj;
{
VALUE result;
NODE *memo = rb_node_newnode(NODE_MEMO, Qnil, 0, 0);
rb_iterate(rb_each, obj, rb_block_given_p() ? max_ii : max_i, (VALUE)memo);
result = memo->u1.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
static VALUE
min_by_i(i, memo)
VALUE i;
NODE *memo;
{
VALUE v;
v = rb_yield(i);
if (NIL_P(memo->u1.value)) {
memo->u1.value = v;
memo->u2.value = i;
}
else if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo->u1.value), v, memo->u1.value) < 0) {
memo->u1.value = v;
memo->u2.value = 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(obj)
VALUE obj;
{
VALUE result;
NODE *memo = rb_node_newnode(NODE_MEMO, Qnil, 0, 0);
rb_iterate(rb_each, obj, min_by_i, (VALUE)memo);
result = memo->u2.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
static VALUE
max_by_i(i, memo)
VALUE i;
NODE *memo;
{
VALUE v;
v = rb_yield(i);
if (NIL_P(memo->u1.value)) {
memo->u1.value = v;
memo->u2.value = i;
}
else if (rb_cmpint(rb_funcall(v, id_cmp, 1, memo->u1.value), v, memo->u1.value) > 0) {
memo->u1.value = v;
memo->u2.value = 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(obj)
VALUE obj;
{
VALUE result;
NODE *memo = rb_node_newnode(NODE_MEMO, Qnil, 0, 0);
rb_iterate(rb_each, obj, max_by_i, (VALUE)memo);
result = memo->u2.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
static VALUE
member_i(item, memo)
VALUE item;
NODE *memo;
{
if (rb_equal(item, memo->u1.value)) {
memo->u2.value = 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(obj, val)
VALUE obj, val;
{
VALUE result;
NODE *memo = rb_node_newnode(NODE_MEMO, val, Qfalse, 0);
rb_iterate(rb_each, obj, member_i, (VALUE)memo);
result = memo->u2.value;
rb_gc_force_recycle((VALUE)memo);
return result;
}
static VALUE
each_with_index_i(val, memo)
VALUE val;
NODE *memo;
{
rb_yield_values(2, val, INT2FIX(memo->u3.cnt));
memo->u3.cnt++;
return Qnil;
}
/*
* 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>.
*
* hash = Hash.new
* %w(cat dog wombat).each_with_index {|item, index|
* hash[item] = index
* }
* hash #=> {"cat"=>0, "wombat"=>2, "dog"=>1}
*
*/
static VALUE
enum_each_with_index(obj)
VALUE obj;
{
NODE *memo = rb_node_newnode(NODE_MEMO, 0, 0, 0);
rb_iterate(rb_each, obj, each_with_index_i, (VALUE)memo);
rb_gc_force_recycle((VALUE)memo);
return obj;
}
static VALUE
zip_i(val, memo)
VALUE val;
NODE *memo;
{
VALUE result = memo->u1.value;
VALUE args = memo->u2.value;
int idx = memo->u3.cnt++;
VALUE tmp;
int i;
tmp = rb_ary_new2(RARRAY(args)->len + 1);
rb_ary_store(tmp, 0, val);
for (i=0; i<RARRAY(args)->len; i++) {
rb_ary_push(tmp, rb_ary_entry(RARRAY(args)->ptr[i], idx));
}
if (rb_block_given_p()) {
rb_yield(tmp);
}
else {
rb_ary_push(result, tmp);
}
return Qnil;
}
/*
* call-seq:
* enum.zip(arg, ...) => array
* enum.zip(arg, ...) {|arr| block } => nil
*
* Converts any arguments to arrays, then merges elements of
* <i>enum</i> with corresponding elements from each argument. This
* generates a sequence of <code>enum#size</code> <em>n</em>-element
* arrays, where <em>n</em> is one more that the count of arguments. If
* the size of any argument is less than <code>enum#size</code>,
* <code>nil</code> values are supplied. If a block given, it is
* invoked for each output array, otherwise an array of arrays is
* returned.
*
* a = [ 4, 5, 6 ]
* b = [ 7, 8, 9 ]
*
* (1..3).zip(a, b) #=> [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
* "cat\ndog".zip([1]) #=> [["cat\n", 1], ["dog", nil]]
* (1..3).zip #=> [[1], [2], [3]]
*
*/
static VALUE
enum_zip(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
int i;
VALUE result;
NODE *memo;
for (i=0; i<argc; i++) {
argv[i] = rb_convert_type(argv[i], T_ARRAY, "Array", "to_a");
}
result = rb_block_given_p() ? Qnil : rb_ary_new();
memo = rb_node_newnode(NODE_MEMO, result, rb_ary_new4(argc, argv), 0);
rb_iterate(rb_each, obj, zip_i, (VALUE)memo);
return result;
}
/*
* 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()
{
rb_mEnumerable = rb_define_module("Enumerable");
rb_define_method(rb_mEnumerable,"to_a", enum_to_a, 0);
rb_define_method(rb_mEnumerable,"entries", enum_to_a, 0);
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,"find", enum_find, -1);
rb_define_method(rb_mEnumerable,"detect", enum_find, -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,"partition", enum_partition, 0);
rb_define_method(rb_mEnumerable,"all?", enum_all, 0);
rb_define_method(rb_mEnumerable,"any?", enum_any, 0);
rb_define_method(rb_mEnumerable,"min", enum_min, 0);
rb_define_method(rb_mEnumerable,"max", enum_max, 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,"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, 0);
rb_define_method(rb_mEnumerable, "zip", enum_zip, -1);
id_eqq = rb_intern("===");
id_each = rb_intern("each");
id_cmp = rb_intern("<=>");
}
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