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/************************************************
enumerator.c - provides Enumerator class
$Author$
Copyright (C) 2001-2003 Akinori MUSHA
$Idaemons: /home/cvs/rb/enumerator/enumerator.c,v 1.1.1.1 2001/07/15 10:12:48 knu Exp $
$RoughId: enumerator.c,v 1.6 2003/07/27 11:03:24 nobu Exp $
$Id$
************************************************/
#include "ruby.h"
#include "node.h"
static VALUE rb_cEnumerator;
static ID sym_each, sym_each_with_index, sym_each_slice, sym_each_cons;
static ID id_new, id_enum_obj, id_enum_method, id_enum_args;
static VALUE
obj_enum_for(obj, enum_args)
VALUE obj, enum_args;
{
rb_ary_unshift(enum_args, obj);
return rb_apply(rb_cEnumerator, id_new, enum_args);
}
static VALUE
enumerator_enum_with_index(obj)
VALUE obj;
{
return rb_funcall(rb_cEnumerator, id_new, 2, obj, sym_each_with_index);
}
static VALUE
each_slice_i(val, memo)
VALUE val;
NODE *memo;
{
VALUE ary = memo->u1.value;
long size = memo->u3.cnt;
rb_ary_push(ary, val);
if (RARRAY(ary)->len == size) {
rb_yield(ary);
memo->u1.value = rb_ary_new2(size);
}
return Qnil;
}
static VALUE
enum_each_slice(obj, n)
VALUE obj, n;
{
long size = NUM2LONG(n);
NODE *memo;
VALUE ary;
if (size <= 0) rb_raise(rb_eArgError, "invalid slice size");
memo = rb_node_newnode(NODE_MEMO, rb_ary_new2(size), 0, size);
rb_iterate(rb_each, obj, each_slice_i, (VALUE)memo);
ary = memo->u1.value;
if (RARRAY(ary)->len > 0) rb_yield(ary);
rb_gc_force_recycle((VALUE)memo);
return Qnil;
}
static VALUE
enumerator_enum_slice(obj, n)
VALUE obj, n;
{
return rb_funcall(rb_cEnumerator, id_new, 3, obj, sym_each_slice, n);
}
static VALUE
each_cons_i(val, memo)
VALUE val;
NODE *memo;
{
VALUE ary = memo->u1.value;
long size = memo->u3.cnt;
long len = RARRAY(ary)->len;
if (len == size) {
rb_ary_shift(ary);
rb_ary_push(ary, val);
rb_yield(ary);
} else {
rb_ary_push(ary, val);
if (len + 1 == size) rb_yield(ary);
}
return Qnil;
}
static VALUE
enum_each_cons(obj, n)
VALUE obj, n;
{
long size = NUM2LONG(n);
NODE *memo;
VALUE ary;
if (size <= 0) rb_raise(rb_eArgError, "invalid size");
memo = rb_node_newnode(NODE_MEMO, rb_ary_new2(size), 0, size);
rb_iterate(rb_each, obj, each_cons_i, (VALUE)memo);
rb_gc_force_recycle((VALUE)memo);
return Qnil;
}
static VALUE
enumerator_enum_cons(obj, n)
VALUE obj, n;
{
return rb_funcall(rb_cEnumerator, id_new, 3, obj, sym_each_cons, n);
}
static VALUE
enumerator_initialize(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE enum_obj, enum_method, enum_args;
rb_scan_args(argc, argv, "11*", &enum_obj, &enum_method, &enum_args);
if (enum_method == Qnil)
enum_method = sym_each;
rb_ivar_set(obj, id_enum_obj, enum_obj);
rb_ivar_set(obj, id_enum_method, enum_method);
rb_ivar_set(obj, id_enum_args, enum_args);
return Qnil;
}
static VALUE
enumerator_iter(memo)
NODE *memo;
{
return rb_apply(memo->u1.value, memo->u2.id, memo->u3.value);
}
static VALUE
enumerator_each(obj)
VALUE obj;
{
VALUE val;
obj = (VALUE)rb_node_newnode(NODE_MEMO,
rb_ivar_get(obj, id_enum_obj),
rb_to_id(rb_ivar_get(obj, id_enum_method)),
rb_ivar_get(obj, id_enum_args));
val = rb_iterate(enumerator_iter, obj, rb_yield, 0);
rb_gc_force_recycle(obj);
return val;
}
void
Init_enumerator()
{
VALUE rb_mEnumerable;
rb_define_method(rb_mKernel, "enum_for", obj_enum_for, -2);
rb_mEnumerable = rb_path2class("Enumerable");
rb_define_method(rb_mEnumerable, "enum_with_index", enumerator_enum_with_index, 0);
rb_define_method(rb_mEnumerable, "each_slice", enum_each_slice, 1);
rb_define_method(rb_mEnumerable, "enum_slice", enumerator_enum_slice, 1);
rb_define_method(rb_mEnumerable, "each_cons", enum_each_cons, 1);
rb_define_method(rb_mEnumerable, "enum_cons", enumerator_enum_cons, 1);
rb_cEnumerator = rb_define_class_under(rb_mEnumerable, "Enumerator", rb_cObject);
rb_include_module(rb_cEnumerator, rb_mEnumerable);
rb_define_method(rb_cEnumerator, "initialize", enumerator_initialize, -1);
rb_define_method(rb_cEnumerator, "each", enumerator_each, 0);
sym_each = ID2SYM(rb_intern("each"));
sym_each_with_index = ID2SYM(rb_intern("each_with_index"));
sym_each_slice = ID2SYM(rb_intern("each_slice"));
sym_each_cons = ID2SYM(rb_intern("each_cons"));
id_new = rb_intern("new");
id_enum_obj = rb_intern("enum_obj");
id_enum_method = rb_intern("enum_method");
id_enum_args = rb_intern("enum_args");
}
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