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(VALUE obj)
{
    return rb_funcall(obj, id_each, 0, 0);
}

static VALUE
grep_i(VALUE i, VALUE *arg)
{
    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 *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(VALUE obj, VALUE 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
count_i(VALUE i, VALUE *arg)
{
    if (rb_equal(i, arg[0])) {
	arg[1]++;
    }
    return Qnil;
}

static VALUE
count_iter_i(VALUE i, long *n)
{
    if (RTEST(rb_yield(i))) {
	(*n)++;
    }
    return Qnil;
}

/*
 *  call-seq:
 *     enum.count(item)             => int
 *     enum.count {| obj | block }  => int
 *  
 *  Returns 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(2)          # => 2
 *     ary.count{|x|x%2==0}  # => 3
 *     
 */

static VALUE
enum_count(int argc, VALUE *argv, VALUE obj)
{
    if (argc == 1) {
	VALUE item, args[2];

	if (rb_block_given_p()) {
	    rb_warn("given block not used");
	}
	rb_scan_args(argc, argv, "1", &item);
	args[0] = item;
	args[1] = 0;
	rb_iterate(rb_each, obj, count_i, (VALUE)&args);
	return INT2NUM(args[1]);
    }
    else {
	long n = 0;

	rb_iterate(rb_each, obj, count_iter_i, (VALUE)&n);
	return INT2NUM(n);
    }
}

static VALUE
find_i(VALUE i, VALUE *memo)
{
    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);