Experimental parser: cleanup dfa.py

src/lexer/lexer_py.re

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 # Character classes and auxiliary regexps.
 
-line_terminator = [:line_terminator:];
+line_terminator = [:line_terminator:];  # TODO(dcarney): just include these
 identifier_start = [$_:letter:];
 identifier_char = [:identifier_start::identifier_part_not_letter:];
 digit = [0-9];
 hex_digit = [0-9a-fA-F];
 unicode_escape = /\\u[:hex_digit:]{4}/;
 single_escape_char = ['"\\bfnrtv];
 maybe_exponent = /([eE][\-+]?[:digit:]+)?/;
 octal_number = /0[0-7]+/;
 
 # Octal numbers are pretty complicated. For example, 01.0 is invalid, since it's
@@ skipping 191 matching lines @@
 catch_all        <||continue>
 eos              <skip_and_terminate>
 
 <<MultiLineComment>>
 /\*+\//          <|skip|>
 # TODO(dcarney): find a way to generate the below rule
 /\*+[^\/*]/      <||continue>
 line_terminator  <line_terminator_in_multiline_comment||continue>
 catch_all        <||continue>
 eos              <terminate_illegal>