Implement rb_enc_str_asciionly_p

Author: chrisseaton

spec/ruby/optional/capi/encoding_spec.rb

@@ -479,4 +479,14 @@
       length.should == 4
     end
   end
+
+  describe "rb_enc_str_asciionly_p" do
+    it "returns true for an ASCII string" do
+      @s.rb_enc_str_asciionly_p("hello").should be_true
+    end
+
+    it "returns true for a non-ASCII string" do
+      @s.rb_enc_str_asciionly_p("hüllo").should be_false
+    end
+  end
 end

spec/ruby/optional/capi/ext/encoding_spec.c

@@ -196,6 +196,14 @@ static VALUE encoding_spec_rb_enc_codepoint_len(VALUE self, VALUE str) {
   return rb_ary_new3(2, LONG2NUM(codepoint), LONG2NUM(len));
 }
 
+static VALUE encoding_spec_rb_enc_str_asciionly_p(VALUE self, VALUE str) {
+  if (rb_enc_str_asciionly_p(str)) {
+    return Qtrue;
+  } else {
+    return Qfalse;
+  }
+}
+
 void Init_encoding_spec(void) {
   VALUE cls = rb_define_class("CApiEncodingSpecs", rb_cObject);
   rb_define_method(cls, "ENC_CODERANGE_ASCIIONLY",
@@ -242,6 +250,7 @@ void Init_encoding_spec(void) {
   rb_define_method(cls, "rb_to_encoding_index", encoding_spec_rb_to_encoding_index, 1);
   rb_define_method(cls, "rb_enc_nth", encoding_spec_rb_enc_nth, 2);
   rb_define_method(cls, "rb_enc_codepoint_len", encoding_spec_rb_enc_codepoint_len, 1);
+  rb_define_method(cls, "rb_enc_str_asciionly_p", encoding_spec_rb_enc_str_asciionly_p, 1);
 }
 
 #ifdef __cplusplus

src/main/c/cext/ruby.c

@@ -3247,7 +3247,7 @@ long rb_str_coderange_scan_restartable(const char *s, const char *e, rb_encoding
 }
 
 int rb_enc_str_asciionly_p(VALUE str) {
-  rb_tr_error("rb_enc_str_asciionly_p not implemented");
+  return polyglot_as_boolean(RUBY_INVOKE_NO_WRAP(str, "ascii_only?"));
 }
 
 int rb_enc_unicode_p(rb_encoding *enc) {