* ext/psych/lib/psych/parser.rb (Mark): Adding a class to wrap

marker information
* ext/psych/parser.c (mark): Add a method to return the mark object
  for the parser
* test/psych/test_parser.rb: tests for the Mark class.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30588 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,13 @@
+Tue Jan 18 04:42:44 2011  Aaron Patterson <aaron@tenderlovemaking.com>
+
+	* ext/psych/lib/psych/parser.rb (Mark): Adding a class to wrap
+	  marker information
+	
+	* ext/psych/parser.c (mark): Add a method to return the mark object
+	  for the parser
+	
+	* test/psych/test_parser.rb: tests for the Mark class.
+
 Tue Jan 18 02:46:55 2011  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/psych/lib/psych/visitors/json_tree.rb (visit_String): JSON

ext/psych/lib/psych/parser.rb

@@ -30,6 +30,9 @@ module Psych
   # construct an AST of the parsed YAML document.
 
   class Parser
+    class Mark < Struct.new(:index, :line, :column)
+    end
+
     # The handler on which events will be called
     attr_accessor :handler
 

ext/psych/parser.c

@@ -307,6 +307,28 @@ static VALUE set_external_encoding(VALUE self, VALUE encoding)
     return encoding;
 }
 
+/*
+ * call-seq:
+ *    parser.mark # => #<Psych::Parser::Mark>
+ *
+ * Returns a Psych::Parser::Mark object that contains line, column, and index
+ * information.
+ */
+static VALUE mark(VALUE self)
+{
+    VALUE mark_klass;
+    VALUE args[3];
+    yaml_parser_t * parser;
+
+    Data_Get_Struct(self, yaml_parser_t, parser);
+    mark_klass = rb_const_get_at(cPsychParser, rb_intern("Mark"));
+    args[0] = INT2NUM(parser->mark.index);
+    args[1] = INT2NUM(parser->mark.line);
+    args[2] = INT2NUM(parser->mark.column);
+
+    return rb_class_new_instance(3, args, mark_klass);
+}
+
 void Init_psych_parser()
 {
 #if 0
@@ -331,6 +353,7 @@ void Init_psych_parser()
     ePsychSyntaxError = rb_define_class_under(mPsych, "SyntaxError", rb_eSyntaxError);
 
     rb_define_method(cPsychParser, "parse", parse, 1);
+    rb_define_method(cPsychParser, "mark", mark, 0);
     rb_define_method(cPsychParser, "external_encoding=", set_external_encoding, 1);
 
     id_read           = rb_intern("read");

test/psych/test_parser.rb

@@ -5,9 +5,12 @@ require_relative 'helper'
 module Psych
   class TestParser < TestCase
     class EventCatcher < Handler
-      attr_reader :calls
+      attr_accessor :parser
+      attr_reader :calls, :marks
       def initialize
-        @calls = []
+        @parser = nil
+        @calls  = []
+        @marks  = []
       end
 
       (Handler.instance_methods(true) -
@@ -15,6 +18,7 @@ module Psych
         class_eval %{
           def #{m} *args
             super
+            @marks << @parser.mark if @parser
             @calls << [:#{m}, args]
           end
         }
@@ -23,7 +27,57 @@ module Psych
 
     def setup
       super
-      @parser = Psych::Parser.new EventCatcher.new
+      @handler        = EventCatcher.new
+      @parser         = Psych::Parser.new @handler
+      @handler.parser = @parser
+    end
+
+    def test_line_numbers
+      assert_equal 0, @parser.mark.line
+      @parser.parse "---\n- hello\n- world"
+      line_calls = @handler.marks.map(&:line).zip(@handler.calls.map(&:first))
+      assert_equal [[0, :start_stream],
+                    [0, :start_document],
+                    [1, :start_sequence],
+                    [2, :scalar],
+                    [3, :scalar],
+                    [3, :end_sequence],
+                    [3, :end_document],
+                    [3, :end_stream]], line_calls
+
+      assert_equal 3, @parser.mark.line
+    end
+
+    def test_column_numbers
+      assert_equal 0, @parser.mark.column
+      @parser.parse "---\n- hello\n- world"
+      col_calls = @handler.marks.map(&:column).zip(@handler.calls.map(&:first))
+      assert_equal [[0, :start_stream],
+                    [3, :start_document],
+                    [1, :start_sequence],
+                    [0, :scalar],
+                    [0, :scalar],
+                    [0, :end_sequence],
+                    [0, :end_document],
+                    [0, :end_stream]], col_calls
+
+      assert_equal 0, @parser.mark.column
+    end
+
+    def test_index_numbers
+      assert_equal 0, @parser.mark.index
+      @parser.parse "---\n- hello\n- world"
+      idx_calls = @handler.marks.map(&:index).zip(@handler.calls.map(&:first))
+      assert_equal [[0, :start_stream],
+                    [3, :start_document],
+                    [5, :start_sequence],
+                    [12, :scalar],
+                    [19, :scalar],
+                    [19, :end_sequence],
+                    [19, :end_document],
+                    [19, :end_stream]], idx_calls
+
+      assert_equal 19, @parser.mark.index
     end
 
     def test_set_encoding_twice