parser_utils.rb in net-imap-0.4.4

- old
+ new

@@ -13,10 +13,11 @@
           LOOKAHEAD = "(@token ||= next_token)"
           SHIFT_TOKEN = "(@token = nil)"
 
           # we can skip lexer for single character matches, as a shortcut
           def def_char_matchers(name, char, token)
+            byte = char.ord
             match_name = name.match(/\A[A-Z]/) ? "#{name}!" : name
             char = char.dump
             class_eval <<~RUBY, __FILE__, __LINE__ + 1
               # frozen_string_literal: true
 
@@ -25,30 +26,30 @@
                 #{LOOKAHEAD}&.symbol == #{token}
               end
 
               # use token or string peek
               def peek_#{name}?
-                @token ? @token.symbol == #{token} : @str[@pos] == #{char}
+                @token ? @token.symbol == #{token} : @str.getbyte(@pos) == #{byte}
               end
 
               # like accept(token_symbols); returns token or nil
               def #{name}?
                 if @token&.symbol == #{token}
                   #{SHIFT_TOKEN}
                   #{char}
-                elsif !@token && @str[@pos] == #{char}
+                elsif !@token && @str.getbyte(@pos) == #{byte}
                   @pos += 1
                   #{char}
                 end
               end
 
               # like match(token_symbols); returns token or raises parse_error
               def #{match_name}
                 if @token&.symbol == #{token}
                   #{SHIFT_TOKEN}
                   #{char}
-                elsif !@token && @str[@pos] == #{char}
+                elsif !@token && @str.getbyte(@pos) == #{byte}
                   @pos += 1
                   #{char}
                 else
                   parse_error("unexpected %s (expected %p)",
                               @token&.symbol || @str[@pos].inspect, #{char})
@@ -107,10 +108,9 @@
                 else
                   #{raise_parse_error}
                 end
               end
             RUBY
-
           end
 
         end
 
         private