diff options
Diffstat (limited to 'ext/enumerator/enumerator.c')
| -rw-r--r-- | ext/enumerator/enumerator.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/ext/enumerator/enumerator.c b/ext/enumerator/enumerator.c new file mode 100644 index 0000000000..65a1ea3fa2 --- /dev/null +++ b/ext/enumerator/enumerator.c @@ -0,0 +1,200 @@ +/************************************************ + + 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"); +} |