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* enumerator.c (enumerator_initialize): Add an ability to generate
an enumerator from a block. [ruby-dev:35903] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@20631 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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knu
parent
8707c67dbf
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3 changed files with 317 additions and 13 deletions
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@ -1,3 +1,8 @@
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Thu Dec 11 19:33:10 2008 Akinori MUSHA <knu@iDaemons.org>
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* enumerator.c (enumerator_initialize): Add an ability to generate
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an enumerator from a block. [ruby-dev:35903]
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Thu Dec 11 19:08:38 2008 Akinori MUSHA <knu@iDaemons.org>
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* enumerator.c (enum_each_with_object): Add
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10
NEWS
10
NEWS
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@ -27,12 +27,14 @@ with all sufficient information, see the ChangeLog file.
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New method with which replaces #choice.
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* Enumerable#each_with_object
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New method.
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* Enumerator#with_object
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New method.
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New methods.
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* Enumerator.new { |y| ... }
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Now can generate an enumerator from a block that defines
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enumeration instead of an enumerable object.
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* Hash#default_proc=
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315
enumerator.c
315
enumerator.c
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@ -33,7 +33,25 @@ struct enumerator {
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rb_block_call_func *iter;
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};
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static VALUE rb_cGenerator, rb_cYielder;
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struct generator {
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VALUE proc;
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};
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struct yielder {
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VALUE proc;
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};
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static VALUE generator_allocate _((VALUE klass));
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static VALUE generator_init _((VALUE obj, VALUE proc));
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/*
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* Enumerator
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*/
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static void enumerator_mark _((void *));
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static void
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enumerator_mark(p)
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void *p;
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@ -292,12 +310,34 @@ enumerator_init(enum_obj, obj, meth, argc, argv)
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/*
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* call-seq:
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* Enumerator.new(obj, method = :each, *args)
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* Enumerator.new { |y| ... }
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*
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* Creates a new Enumerator object, which is to be used as an
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* Enumerable object using the given object's given method with the
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* given arguments.
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* Enumerable object iterating in a given way.
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*
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* Use of this method is discouraged. Use Kernel#enum_for() instead.
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* In the first form, a generated Enumerator iterates over the given
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* object using the given method with the given arguments passed.
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* Use of this form is discouraged. Use Kernel#enum_for(), alias
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* to_enum, instead.
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*
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* e = Enumerator.new(ObjectSpace, :each_object)
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* #-> ObjectSpace.enum_for(:each_object)
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*
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* e.select { |obj| obj.is_a?(Class) } #=> array of all classes
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*
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* In the second form, iteration is defined by the given block, in
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* which a "yielder" object given as block parameter can be used to
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* yield a value by calling the +yield+ method, alias +<<+.
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*
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* fib = Enumerator.new { |y|
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* a = b = 1
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* loop {
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* y << a
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* a, b = b, a + b
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* }
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* }
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*
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* p fib.take(10) #=> [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
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*/
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static VALUE
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enumerator_initialize(argc, argv, obj)
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@ -307,13 +347,19 @@ enumerator_initialize(argc, argv, obj)
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{
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VALUE recv, meth = sym_each;
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if (argc == 0)
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rb_raise(rb_eArgError, "wrong number of argument (0 for 1)");
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recv = *argv++;
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if (--argc) {
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meth = *argv++;
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--argc;
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if (argc == 0) {
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if (!rb_block_given_p())
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rb_raise(rb_eArgError, "wrong number of argument (0 for 1+)");
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recv = generator_init(generator_allocate(rb_cGenerator), rb_block_proc());
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} else {
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recv = *argv++;
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if (--argc) {
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meth = *argv++;
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--argc;
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}
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}
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return enumerator_init(obj, recv, meth, argc, argv);
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}
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@ -490,6 +536,242 @@ enumerator_rewind(obj)
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return rb_funcall(obj, rb_intern("rewind"), 0, 0);
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}
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/*
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* Yielder
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*/
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static void yielder_mark _((void *));
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static void
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yielder_mark(void *p)
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{
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struct yielder *ptr = p;
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rb_gc_mark(ptr->proc);
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}
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static struct yielder *
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yielder_ptr(VALUE obj)
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{
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struct yielder *ptr;
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Data_Get_Struct(obj, struct yielder, ptr);
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if (RDATA(obj)->dmark != yielder_mark) {
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rb_raise(rb_eTypeError,
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"wrong argument type %s (expected %s)",
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rb_obj_classname(obj), rb_class2name(rb_cYielder));
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}
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if (!ptr || ptr->proc == Qundef) {
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rb_raise(rb_eArgError, "uninitialized yielder");
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}
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return ptr;
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}
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static VALUE yielder_allocate _((VALUE));
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/* :nodoc: */
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static VALUE
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yielder_allocate(klass)
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VALUE klass;
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{
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struct yielder *ptr;
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VALUE obj;
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obj = Data_Make_Struct(klass, struct yielder, yielder_mark, -1, ptr);
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ptr->proc = Qundef;
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return obj;
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}
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static VALUE
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yielder_init(obj, proc)
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VALUE obj, proc;
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{
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struct yielder *ptr;
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Data_Get_Struct(obj, struct yielder, ptr);
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if (!ptr) {
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rb_raise(rb_eArgError, "unallocated yielder");
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}
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ptr->proc = proc;
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return obj;
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}
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/* :nodoc: */
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static VALUE
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yielder_initialize(obj)
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VALUE obj;
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{
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rb_need_block();
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return yielder_init(obj, rb_block_proc());
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}
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/* :nodoc: */
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static VALUE
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yielder_yield(obj, args)
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VALUE obj, args;
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{
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struct yielder *ptr = yielder_ptr(obj);
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rb_proc_call(ptr->proc, args);
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return obj;
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}
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static VALUE
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yielder_new_i(dummy)
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VALUE dummy;
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{
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return yielder_init(yielder_allocate(rb_cYielder), rb_block_proc());
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}
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static VALUE
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yielder_yield_i(obj, memo)
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VALUE obj, memo;
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{
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return rb_yield(obj);
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}
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static VALUE
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yielder_new()
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{
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return rb_iterate(yielder_new_i, (VALUE)0, yielder_yield_i, (VALUE)0);
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}
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/*
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* Generator
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*/
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static void generator_mark _((void *));
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static void
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generator_mark(p)
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void *p;
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{
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struct generator *ptr = p;
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rb_gc_mark(ptr->proc);
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}
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static struct generator *
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generator_ptr(obj)
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VALUE obj;
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{
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struct generator *ptr;
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Data_Get_Struct(obj, struct generator, ptr);
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if (RDATA(obj)->dmark != generator_mark) {
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rb_raise(rb_eTypeError,
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"wrong argument type %s (expected %s)",
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rb_obj_classname(obj), rb_class2name(rb_cGenerator));
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}
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if (!ptr || ptr->proc == Qundef) {
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rb_raise(rb_eArgError, "uninitialized generator");
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}
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return ptr;
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}
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static VALUE generator_allocate _((VALUE));
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/* :nodoc: */
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static VALUE
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generator_allocate(klass)
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VALUE klass;
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{
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struct generator *ptr;
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VALUE obj;
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obj = Data_Make_Struct(klass, struct generator, generator_mark, -1, ptr);
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ptr->proc = Qundef;
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return obj;
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}
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static VALUE
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generator_init(obj, proc)
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VALUE obj, proc;
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{
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struct generator *ptr;
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Data_Get_Struct(obj, struct generator, ptr);
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if (!ptr) {
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rb_raise(rb_eArgError, "unallocated generator");
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}
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ptr->proc = proc;
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return obj;
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}
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VALUE rb_obj_is_proc _((VALUE));
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/* :nodoc: */
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static VALUE
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generator_initialize(argc, argv, obj)
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int argc;
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VALUE *argv;
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VALUE obj;
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{
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VALUE proc;
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if (argc == 0) {
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rb_need_block();
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proc = rb_block_proc();
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} else {
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rb_scan_args(argc, argv, "1", &proc);
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if (!rb_obj_is_proc(proc))
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rb_raise(rb_eTypeError,
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"wrong argument type %s (expected Proc)",
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rb_obj_classname(proc));
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if (rb_block_given_p()) {
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rb_warn("given block not used");
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}
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}
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return generator_init(obj, proc);
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}
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/* :nodoc: */
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static VALUE
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generator_init_copy(obj, orig)
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VALUE obj, orig;
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{
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struct generator *ptr0, *ptr1;
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ptr0 = generator_ptr(orig);
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Data_Get_Struct(obj, struct generator, ptr1);
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if (!ptr1) {
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rb_raise(rb_eArgError, "unallocated generator");
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}
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ptr1->proc = ptr0->proc;
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return obj;
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}
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/* :nodoc: */
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static VALUE
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generator_each(obj)
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VALUE obj;
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{
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struct generator *ptr = generator_ptr(obj);
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VALUE yielder;
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yielder = yielder_new();
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rb_proc_call(ptr->proc, rb_ary_new3(1, yielder));
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return obj;
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}
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void
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Init_Enumerator()
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{
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@ -518,6 +800,21 @@ Init_Enumerator()
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rb_eStopIteration = rb_define_class("StopIteration", rb_eIndexError);
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/* Generator */
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rb_cGenerator = rb_define_class_under(rb_cEnumerator, "Generator", rb_cObject);
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rb_include_module(rb_cGenerator, rb_mEnumerable);
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rb_define_alloc_func(rb_cGenerator, generator_allocate);
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rb_define_method(rb_cGenerator, "initialize", generator_initialize, -1);
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rb_define_method(rb_cGenerator, "initialize_copy", generator_init_copy, 1);
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rb_define_method(rb_cGenerator, "each", generator_each, 0);
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/* Yielder */
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rb_cYielder = rb_define_class_under(rb_cEnumerator, "Yielder", rb_cObject);
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rb_define_alloc_func(rb_cYielder, yielder_allocate);
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rb_define_method(rb_cYielder, "initialize", yielder_initialize, 0);
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rb_define_method(rb_cYielder, "yield", yielder_yield, -2);
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rb_define_method(rb_cYielder, "<<", yielder_yield, -2);
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sym_each = ID2SYM(rb_intern("each"));
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/* backward compatibility */
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