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annotate lineend.py @ 61:82891de09dbf

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before splicing new terminator parsing in
author catherine@Elli.myhome.westell.com
date Fri, 20 Jun 2008 20:41:19 -0400
parents 682588392eaf
children 95e239c87010
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 terminators = (';', 'EOF')
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5 #pattern = pyparsing.Optional(pyparsing.CharsNotIn(terminators)) + pyparsing.oneOf(';')
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6 complete_pattern = pyparsing.SkipTo(pyparsing.oneOf(terminators))
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7 complete_pattern.ignore(pyparsing.sglQuotedString)
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8 complete_pattern.ignore(pyparsing.sglQuotedString)
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10 redirect_pattern = pyparsing.Optional(pyparsing.CharsNotIn('<>')) + pyparsing.oneOf('< >') + pyparsing.Word(pyparsing.printables)
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11 redirect_pattern.ignore(pyparsing.sglQuotedString)
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12 redirect_pattern.ignore(pyparsing.sglQuotedString)
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14 pipe_pattern = pyparsing.Optional(pyparsing.CharsNotIn('|')) + '|' + pyparsing.SkipTo(pyparsing.StringEnd())
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15 pipe_pattern.ignore(pyparsing.sglQuotedString)
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16 pipe_pattern.ignore(pyparsing.sglQuotedString)
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17
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18 def parse(txt, mustBeTerminated=False):
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19 """
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20 >>> sorted(parse('select * from dual;', True).items())
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21 [('complete', True), ('inputFrom', None), ('outputTo', None), ('pipeTo', None)]
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22 >>> sorted(parse('select * from dual E', True).items())
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23 [('complete', False), ('inputFrom', None), ('outputTo', None), ('pipeTo', None)]
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24 >>> sorted(parse('select * from', True).items())
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25 [('complete', False), ('inputFrom', None), ('outputTo', None), ('pipeTo', None)]
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26 >>> sorted(parse('select * from dual; > result.txt', True).items())
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27 [('complete', True), ('inputFrom', None), ('outputTo', 'result.txt'), ('pipeTo', None)]
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28 >>> sorted(parse("select * from dual where val = 'x > y'", True).items())
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29 [('complete', False), ('inputFrom', None), ('outputTo', None), ('pipeTo', None)]
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30 >>> sorted(parse('select * from dual; | wc -c', True).items())
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31 [('complete', True), ('inputFrom', None), ('outputTo', None), ('pipeTo', 'wc -c')]
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32 """
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33 result = {'complete': not mustBeTerminated, 'inputFrom': None, 'outputTo': None, 'pipeTo': None}
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34 if mustBeTerminated:
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35 try:
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36 complete_pattern.parseString(txt)
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37 result['complete'] = True
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38 except pyparsing.ParseException:
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39 pass
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40
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41 if result['complete']:
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42 try:
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43 parsed = redirect_pattern.parseString(txt)
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44 if parsed[1] == '>':
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45 result['outputTo'] = parsed[2]
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46 else:
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47 result['inputFrom'] = parsed[2]
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48 except pyparsing.ParseException:
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49 pass
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50 try:
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51 parsed = pipe_pattern.parseString(txt)
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52 result['pipeTo'] = parsed[2]
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53 except pyparsing.ParseException:
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54 pass
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55
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56 return result
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57
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58 if __name__ == '__main__':
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59 doctest.testmod()
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