Experimental parser: split classes into latin1 and non latin1

src/lexer/lexer_py.re

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-whitespace_char = [ \t\v\f\r:whitespace:\240];
+whitespace_char = [:whitespace:];
 whitespace = whitespace_char+;
-identifier_start = [$_a-zA-Z:letter:];
-identifier_char = [0-9:identifier_part_not_letter::identifier_start:];
-line_terminator = [\n\r];
+identifier_start = [$_:letter:];
+identifier_char = [:identifier_start::identifier_part_not_letter:];
+line_terminator = [:line_terminator:];
 digit = [0-9];
 hex_digit = [0-9a-fA-F];
 single_escape_char = ['"\\bfnrtv];
 maybe_exponent = /([eE][\-+]?[:digit:]+)?/;
 number =
   /0[xX][:hex_digit:]+/ | (
   /\.[:digit:]+/ maybe_exponent |
   /[:digit:]+(\.[:digit:]*)?/ maybe_exponent );
-# TODO this is incomplete/incorrect
-line_terminator_sequence = (/\n\r?/)|(/\r\n?/);
+line_terminator_sequence = /[:line_terminator:]|\r\n/;
 eos = [:eos:];
 
 # grammar is
 #   regex <action_on_state_entry|action_on_match|transition>
 #
 # actions can be c code enclosed in {} or identifiers to be passed to codegen
 # transition must be in continue or the name of a subgraph
 
 <<default>>
 "|="          <|push_token(ASSIGN_BIT_OR)|>
@@ skipping 177 matching lines @@
 eos <|skip_and_terminate|>
 catch_all <||continue>
 
 <<MultiLineComment>>
 /\*+\//             <|skip|>
 # TODO find a way to generate the below rule
 /\*+[^\/*]/       <||continue>
 line_terminator  <push_line_terminator||continue>
 eos <|terminate_illegal|>
 catch_all        <||continue>