1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
#
# 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:
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)
|
