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annotate lineend.py @ 74:4e290d75e92e

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ugh, big new refactoring: split out UserCommand
author catherine@Elli.myhome.westell.com
date Wed, 25 Jun 2008 17:16:07 -0400
parents 4e028e9ec4c2
children
rev   line source
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682588392eaf experiments with parsing in lineend
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1 import pyparsing, sys, doctest
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3 integer_pattern = pyparsing.Optional(pyparsing.Word(pyparsing.nums))
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4 terminators = [pyparsing.Literal(';') + integer_pattern,
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5 pyparsing.Literal('\\t') + integer_pattern]
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6 complete_pattern = reduce(lambda x, y: x ^ y, terminators)
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7 redirect_pattern = pyparsing.oneOf('< >') + pyparsing.restOfLine
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8 pipe_pattern = pyparsing.Literal('|') + pyparsing.restOfLine
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10 for pattern in (complete_pattern, redirect_pattern, pipe_pattern):
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11 pattern.ignore(pyparsing.sglQuotedString)
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12 pattern.ignore(pyparsing.dblQuotedString)
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13
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14 def parse(txt):
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15 """
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16 >>> sorted(parse('select * from dual;').items())
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17 [('inputFrom', None), ('outputTo', None), ('pipeTo', None), ('terminator', [';'])]
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18 >>> sorted(parse('select * from dual E').items())
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19 [('inputFrom', None), ('outputTo', None), ('pipeTo', None), ('terminator', None)]
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20 >>> sorted(parse('select * from').items())
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21 [('inputFrom', None), ('outputTo', None), ('pipeTo', None), ('terminator', None)]
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22 >>> sorted(parse('select * from dual; > result.txt').items())
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23 [('inputFrom', None), ('outputTo', 'result.txt'), ('pipeTo', None), ('terminator', [';'])]
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24 >>> sorted(parse("select * from dual where val = 'x > y'").items())
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25 [('inputFrom', None), ('outputTo', None), ('pipeTo', None), ('terminator', None)]
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26 >>> sorted(parse('select * from dual; | wc -c').items())
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27 [('inputFrom', None), ('outputTo', None), ('pipeTo', 'wc -c'), ('terminator', [';'])]
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28 >>> sorted(parse('select * from dual; | sort > sorted.txt').items())
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29 [('inputFrom', None), ('outputTo', None), ('pipeTo', 'sort > sorted.txt'), ('terminator', [';'])]
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30 """
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31 result = {'inputFrom': None, 'outputTo': None, 'pipeTo': None, 'terminator': None}
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32 found = complete_pattern.searchString(txt)
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33 if found:
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34 result['terminator'] = found[0][:]
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35 found = pipe_pattern.searchString(txt)
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36 if found:
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37 result['pipeTo'] = found[0][1].strip()
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38 else: # pipe overrides redirects
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39 found = redirect_pattern.searchString(txt)
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40 if found:
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41 if found[0][0] == '>':
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42 result['outputTo'] = found[0][1].strip()
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43 else:
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44 result['inputFrom'] = found[0][1].strip()
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46 return result
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48 if __name__ == '__main__':
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49 doctest.testmod()
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