lib/d-mark/parser.rb in d-mark-1.0.0a4 vs lib/d-mark/parser.rb in d-mark-1.0.0b1

@@ -2,22 +2,37 @@
   class Parser
     class ParserError < StandardError
       attr_reader :line_nr
       attr_reader :col_nr
 
-      def initialize(line_nr, col_nr, msg)
+      def initialize(line_nr, col_nr, msg, content)
         @line_nr = line_nr
         @col_nr = col_nr
         @msg = msg
+        @content = content
 
         super("parse error at line #{@line_nr + 1}, col #{@col_nr + 1}: #{@msg}")
       end
+
+      def fancy_message
+        line = @content.lines[line_nr]
+
+        lines = [
+          message,
+          '',
+          line.rstrip,
+          "\e[31m" + ' ' * [col_nr, 0].max + '↑' + "\e[0m"
+        ]
+
+        lines.join("\n")
+      end
     end
 
     attr_reader :pos
 
     def initialize(input)
+      @input = input
       @input_chars = input.chars
       @length = @input_chars.size
 
       @pos = 0
       @col_nr = 0
@@ -366,9 +381,9 @@
 
       ElementNode.new(name, attributes, contents)
     end
 
     def raise_parse_error(msg)
-      raise ParserError.new(@line_nr, @col_nr, msg)
+      raise ParserError.new(@line_nr, @col_nr, msg, @input)
     end
   end
 end