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- #
- # linenoExample.py
- #
- # an example of using the location value returned by pyparsing to
- # extract the line and column number of the location of the matched text,
- # or to extract the entire line of text.
- #
- # Copyright (c) 2006, Paul McGuire
- #
- from pyparsing import *
- data = """Now is the time
- for all good men
- to come to the aid
- of their country."""
- # demonstrate use of lineno, line, and col in a parse action
- def reportLongWords(st,locn,toks):
- word = toks[0]
- if len(word) > 3:
- print("Found '%s' on line %d at column %d" % (word, lineno(locn,st), col(locn,st)))
- print("The full line of text was:")
- print("'%s'" % line(locn,st))
- print((" "*col(locn,st))+" ^")
- print()
- wd = Word(alphas).setParseAction( reportLongWords )
- OneOrMore(wd).parseString(data)
- # demonstrate returning an object from a parse action, containing more information
- # than just the matching token text
- class Token(object):
- def __init__(self, st, locn, tokString):
- self.tokenString = tokString
- self.locn = locn
- self.sourceLine = line(locn,st)
- self.lineNo = lineno(locn,st)
- self.col = col(locn,st)
- def __str__(self):
- return "%(tokenString)s (line: %(lineNo)d, col: %(col)d)" % self.__dict__
- def createTokenObject(st,locn,toks):
- return Token(st,locn, toks[0])
- wd = Word(alphas).setParseAction( createTokenObject )
- for tokenObj in OneOrMore(wd).parseString(data):
- print(tokenObj)
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