lib/asciimath/parser.rb in asciimath-2.0.1 vs lib/asciimath/parser.rb in asciimath-2.0.2

@@ -439,10 +439,11 @@
       b.add('bfr', :bold_fraktur, :unary)
       b.add('sf', :sans_serif, :unary)
       b.add('bsf', :bold_sans_serif, :unary)
       b.add('sfi', :sans_serif_italic, :unary)
       b.add('sfbi', :sans_serif_bold_italic, :unary)
+      b.add('rm', :roman, :unary)
 
       # Greek letters
       b.add('alpha', :alpha, :symbol)
       b.add('Alpha', :Alpha, :symbol)
       b.add('beta', :beta, :symbol)
@@ -610,16 +611,20 @@
             nil
           else
             token_to_symbol(t1)
           end
         when :unary
-          s = unwrap_paren(parse_simple_expression(tok, depth))
+          parse_simple_expression = parse_simple_expression(tok, depth)
+          s = unwrap_paren(parse_simple_expression)
+          s = identifier('') if s.nil?
           s = convert_node(s, t1[:convert_operand])
           unary(token_to_symbol(t1), s)
         when :binary
           s1 = unwrap_paren(parse_simple_expression(tok, depth))
+          s1 = identifier('') if s1.nil?
           s2 = unwrap_paren(parse_simple_expression(tok, depth))
+          s2 = identifier('') if s2.nil?
 
           s1 = convert_node(s1, t1[:convert_operand1])
           s2 = convert_node(s2, t1[:convert_operand2])
 
           binary(token_to_symbol(t1), s1, s2)
@@ -702,10 +707,9 @@
     end
 
     def convert_to_color(color_expression)
       s = ""
       append_color_text(s, color_expression)
-      s
 
       case s
         when /#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})/i
           color_value = {:r => $1.to_i(16), :g => $2.to_i(16), :b => $3.to_i(16), }
         when /#([0-9a-f])([0-9a-f])([0-9a-f])/i