Mercurial > python-cmd2
diff cmd2.py @ 146:9ffb01d8876f
streamlining parsing
author | catherine@dellzilla |
---|---|
date | Thu, 20 Nov 2008 14:21:11 -0500 |
parents | 0e0fc729e1a2 |
children | cda32481187c |
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--- a/cmd2.py Wed Nov 19 16:36:45 2008 -0500 +++ b/cmd2.py Thu Nov 20 14:21:11 2008 -0500 @@ -191,6 +191,7 @@ def __init__(self, *args, **kwargs): cmd.Cmd.__init__(self, *args, **kwargs) self.history = History() + self.terminatorPattern = (pyparsing.oneOf(self.terminators) ^ (pyparsing.Literal('\nEOF') + pyparsing.lineEnd))('terminator') for p in (self.terminatorPattern, self.pipePattern, self.redirectInPattern, self.redirectOutPattern, self.punctuationPattern): p.ignore(pyparsing.sglQuotedString) p.ignore(pyparsing.dblQuotedString) @@ -206,10 +207,7 @@ commentGrammars = pyparsing.Or([pyparsing.pythonStyleComment, pyparsing.cStyleComment]) commentInProgress = pyparsing.Literal('/*') + pyparsing.SkipTo(pyparsing.stringEnd) - - specialTerminators = {'/*': pyparsing.Literal('*/')('terminator') } - terminatorPattern = ((pyparsing.Literal(';') ^ pyparsing.Literal('\n\n')) - ^ (pyparsing.Literal('\nEOF') + pyparsing.lineEnd))('terminator') + terminators = [';', '\n\n'] argSeparatorPattern = pyparsing.Word(pyparsing.printables)('command') \ + pyparsing.SkipTo(pyparsing.StringEnd())('args') filenamePattern = pyparsing.Word(pyparsing.alphanums + '#$-_~{},.!:\\/') @@ -221,7 +219,36 @@ + pyparsing.Optional(filenamePattern)('inputFrom') punctuationPattern = pipePattern ^ redirectInPattern ^ redirectOutPattern + def p2(self, s, assumeComplete=False): + ''' + >>> c = Cmd() + >>> print c.p2('barecommand').dump() + >>> print c.p2('command with args').dump() + >>> print c.p2('command with args and terminator; and suffix').dump() + >>> print c.p2('command with args, terminator;sufx | piped').dump() + >>> print c.p2('simple | piped').dump() + >>> print c.p2('output into > afile.txt').dump() + >>> print c.p2('output into;sufx | pipethrume plz > afile.txt').dump() + >>> print c.p2('output to paste buffer >> ').dump() + ''' + outputParser = pyparsing.oneOf(['>>','>'])('output') + terminatorParser = pyparsing.oneOf(self.terminators)('terminator') + (pyparsing.stringEnd ^ pyparsing.oneOf(self.terminators) ^ '\nEOF' ^ '|' ^ outputParser)('terminator') + statementParser = pyparsing.Combine(pyparsing.Word(pyparsing.printables)('command') + + pyparsing.SkipTo(terminatorParser ^ '\nEOF' ^ '|' ^ outputParser ^ pyparsing.stringEnd)('args') + + pyparsing.Optional(terminatorParser) + )('statement') + parser = statementParser + \ + pyparsing.SkipTo(outputParser ^ '|' ^ pyparsing.stringEnd)('suffix') + \ + pyparsing.Optional('|' + pyparsing.SkipTo(outputParser ^ pyparsing.stringEnd)('pipeDest')) + \ + pyparsing.Optional(outputParser + pyparsing.SkipTo(pyparsing.stringEnd)('outputDest')) + self.commentGrammars.ignore(pyparsing.sglQuotedString).ignore(pyparsing.dblQuotedString).setParseAction(lambda x: '') + self.commentInProgress.ignore(pyparsing.sglQuotedString).ignore(pyparsing.dblQuotedString).ignore(pyparsing.cStyleComment) + parser.ignore(pyparsing.sglQuotedString).ignore(pyparsing.dblQuotedString).ignore(self.commentGrammars).ignore(self.commentInProgress) + return parser.parseString(s) + def parsed(self, s, assumeComplete=False): + pass ''' >>> c = Cmd() >>> r = c.parsed('quotes "are > ignored" < inp.txt') @@ -267,8 +294,8 @@ # does not catch output marks if (not assumeComplete) and (command in self.multilineCommands): return result # don't bother with the rest, we're still collecting input - result['statement'] = result['unterminated'] = result.before result += parseSearchResults(self.punctuationPattern, s) + result['statement'] = result['unterminated'] = result.before result += parseSearchResults(self.pipePattern, result.parseable) result += parseSearchResults(self.redirectInPattern, result.parseable) result += parseSearchResults(self.redirectOutPattern, result.parseable)