mame	2018-12-06 15:40:54 +0900 (Thu, 06 Dec 2018)

  New Revision: 66237

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66237

  Log:
    load.c (RubyVM.resolve_feature_path): New method.  [Feature #15230]

  Modified files:
    trunk/NEWS
    trunk/load.c
    trunk/vm.c
Index: NEWS
===================================================================
--- NEWS	(revision 66236)
+++ NEWS	(revision 66237)
@@ -266,6 +266,13 @@ sufficient information, see the ChangeLo https://github.com/ruby/ruby/blob/trunk/NEWS#L266
     * Range#step now returns an instance of Enumerator::ArithmeticSequence
       class rather than one of Enumerator class.
 
+[RubyVM]
+
+  [New methods]
+
+    * RubyVM.resolve_feature_path identifies the file that will be loaded by
+      "require(feature)". [experimental] [Feature #15230]
+
 [RubyVM::AbstractSyntaxTree]
 
   [New methods]
Index: vm.c
===================================================================
--- vm.c	(revision 66236)
+++ vm.c	(revision 66237)
@@ -2869,6 +2869,8 @@ static VALUE usage_analysis_operand_stop https://github.com/ruby/ruby/blob/trunk/vm.c#L2869
 static VALUE usage_analysis_register_stop(VALUE self);
 #endif
 
+VALUE rb_resolve_feature_path(VALUE klass, VALUE fname);
+
 void
 Init_VM(void)
 {
@@ -3171,6 +3173,8 @@ Init_VM(void) https://github.com/ruby/ruby/blob/trunk/vm.c#L3173
 
     /* vm_backtrace.c */
     Init_vm_backtrace();
+
+    rb_define_singleton_method(rb_cRubyVM, "resolve_feature_path", rb_resolve_feature_path, 1);
 }
 
 void
Index: load.c
===================================================================
--- load.c	(revision 66236)
+++ load.c	(revision 66237)
@@ -943,6 +943,42 @@ load_ext(VALUE path) https://github.com/ruby/ruby/blob/trunk/load.c#L943
 }
 
 /*
+ *  call-seq:
+ *     RubyVM.resolve_feature_path(feature) -> [:rb or :so, path]
+ *
+ *  Identifies the file that will be loaded by "require(feature)".
+ *  This API is experimental and just for internal.
+ *
+ *     RubyVM.resolve_feature_path("set")
+ *       #=> [:rb, "/path/to/feature.rb"]
+ */
+
+VALUE
+rb_resolve_feature_path(VALUE klass, VALUE fname)
+{
+    VALUE path;
+    int found;
+    VALUE sym;
+
+    fname = rb_get_path_check(fname, 0);
+    path = rb_str_encode_ospath(fname);
+    found = search_required(path, &path, 0);
+
+    switch (found) {
+      case 'r':
+        sym = ID2SYM(rb_intern("rb"));
+        break;
+      case 's':
+        sym = ID2SYM(rb_intern("so"));
+        break;
+      default:
+        load_failed(fname);
+    }
+
+    return rb_ary_new_from_args(2, sym, path);
+}
+
+/*
  * returns
  *  0: if already loaded (false)
  *  1: successfully loaded (true)

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