Experimental parser: split out NfaBuilder

tools/lexer_generator/rule_parser.py

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 # modification, are permitted provided that the following conditions are
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@@ skipping 10 matching lines @@
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 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 import ply.yacc as yacc
 from rule_lexer import RuleLexer
 from regex_parser import RegexParser
-from nfa import NfaBuilder
+from nfa_builder import NfaBuilder
 from transition_keys import TransitionKey
 
 class RuleParserState:
 
   def __init__(self):
     self.aliases = {
       'eof' : RegexParser.parse("[\\0]"),
     }
     self.character_classes = {}
     self.current_state = None
@@ skipping 163 matching lines @@
       parser.build()
       RuleParser.__static_instance = parser
     parser.__state = parser_state
     try:
       parser.parser.parse(data, lexer=parser.lexer.lexer)
     except Exception:
       RuleParser.__static_instance = None
       raise
     parser.__state = None
     assert parser_state.transitions <= set(parser_state.rules.keys())