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annotate lineend.py @ 60:682588392eaf

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experiments with parsing in lineend
author catherine@Elli.myhome.westell.com
date Fri, 20 Jun 2008 19:52:39 -0400
parents
children 82891de09dbf
rev   line source
60
682588392eaf experiments with parsing in lineend
catherine@Elli.myhome.westell.com
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1 import pyparsing, sys, doctest
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2
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3 pattern = pyparsing.Optional(pyparsing.CharsNotIn(';')) + ';'
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4 pattern.ignore(pyparsing.sglQuotedString)
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5 pattern.ignore(pyparsing.sglQuotedString)
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6
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7 redirect_pattern = pyparsing.Optional(pyparsing.CharsNotIn('<>')) + pyparsing.oneOf('< >') + pyparsing.Word(pyparsing.printables)
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8 redirect_pattern.ignore(pyparsing.sglQuotedString)
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9 redirect_pattern.ignore(pyparsing.sglQuotedString)
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10
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11 def parse(txt, mustBeTerminated=False):
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12 """
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13 >>> sorted(parse('select * from dual;', True).items())
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14 [('complete', True), ('inputFrom', None), ('outputTo', None), ('pipeTo', None)]
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15 >>> sorted(parse('select * from', True).items())
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16 [('complete', False), ('inputFrom', None), ('outputTo', None), ('pipeTo', None)]
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17 >>> sorted(parse('select * from dual; > result.txt', True).items())
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18 [('complete', True), ('inputFrom', None), ('outputTo', 'result.txt'), ('pipeTo', None)]
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19 """
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20 result = {'complete': not mustBeTerminated, 'inputFrom': None, 'outputTo': None, 'pipeTo': None}
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21 if mustBeTerminated:
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22 try:
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23 pattern.parseString(txt)
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24 result['complete'] = True
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25 except pyparsing.ParseException:
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26 pass
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27
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28 if result['complete']:
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29 try:
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30 parsed = redirect_pattern.parseString(txt)
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31 if parsed[1] == '>':
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32 result['outputTo'] = parsed[2]
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33 else:
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34 result['inputFrom'] = parsed[2]
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35 except pyparsing.ParseException:
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36 pass
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37 return result
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38
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39 if __name__ == '__main__':
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40 doctest.testmod()
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41