/usr/share/doc/python-pyparsing-doc/examples/parseListString.py is in python-pyparsing-doc 2.0.3+dfsg1-1.
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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 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | # parseListString.py
#
# Copyright, 2006, by Paul McGuire
#
from pyparsing import *
# first pass
lbrack = Literal("[")
rbrack = Literal("]")
integer = Word(nums).setName("integer")
real = Combine(Optional(oneOf("+ -")) + Word(nums) + "." +
Optional(Word(nums))).setName("real")
listItem = real | integer | quotedString
listStr = lbrack + delimitedList(listItem) + rbrack
test = "['a', 100, 3.14]"
print(listStr.parseString(test))
# second pass, cleanup and add converters
lbrack = Literal("[").suppress()
rbrack = Literal("]").suppress()
cvtInt = lambda s,l,toks: int(toks[0])
integer = Word(nums).setName("integer").setParseAction( cvtInt )
cvtReal = lambda s,l,toks: float(toks[0])
real = Combine(Optional(oneOf("+ -")) + Word(nums) + "." +
Optional(Word(nums))).setName("real").setParseAction( cvtReal )
listItem = real | integer | quotedString.setParseAction( removeQuotes )
listStr = lbrack + delimitedList(listItem) + rbrack
test = "['a', 100, 3.14]"
print(listStr.parseString(test))
# third pass, add nested list support, and tuples, too!
cvtInt = lambda s,l,toks: int(toks[0])
cvtReal = lambda s,l,toks: float(toks[0])
lbrack = Literal("[").suppress()
rbrack = Literal("]").suppress()
integer = Word(nums).setName("integer").setParseAction( cvtInt )
real = Combine(Optional(oneOf("+ -")) + Word(nums) + "." +
Optional(Word(nums))).setName("real").setParseAction( cvtReal )
tupleStr = Forward()
listStr = Forward()
listItem = real | integer | quotedString.setParseAction(removeQuotes) | Group(listStr) | tupleStr
tupleStr << ( Suppress("(") + delimitedList(listItem) + Optional(Suppress(",")) + Suppress(")") )
tupleStr.setParseAction( lambda t:tuple(t.asList()) )
listStr << lbrack + delimitedList(listItem) + Optional(Suppress(",")) + rbrack
test = "['a', 100, ('A', [101,102]), 3.14, [ +2.718, 'xyzzy', -1.414] ]"
print(listStr.parseString(test))
# fourth pass, just parsing tuples of numbers
#~ from pyparsing import *
#~ integer = (Word(nums)|Word('-+',nums)).setName("integer")
#~ real = Combine(integer + "." + Optional(Word(nums))).setName("real")
#~ tupleStr = Forward().setName("tuple")
#~ tupleItem = real | integer | tupleStr
#~ tupleStr << ( Suppress("(") + delimitedList(tupleItem) +
#~ Optional(Suppress(",")) + Suppress(")") )
#~ # add parse actions to do conversion during parsing
#~ integer.setParseAction( lambda toks: int(toks[0]) )
#~ real.setParseAction( lambda toks: float(toks[0]) )
#~ tupleStr.setParseAction( lambda toks: tuple(toks) )
#~ s = '((1,2), (3,4), (-5,9.2),)'
#~ print tupleStr.parseString(s)[0]
cvtInt = lambda s,l,toks: int(toks[0])
cvtReal = lambda s,l,toks: float(toks[0])
cvtDict = lambda s,l,toks: dict(toks[0])
lbrack = Literal("[").suppress()
rbrack = Literal("]").suppress()
lbrace = Literal("{").suppress()
rbrace = Literal("}").suppress()
colon = Literal(":").suppress()
integer = Word(nums).setName("integer").setParseAction( cvtInt )
real = Combine(Optional(oneOf("+ -")) + Word(nums) + "." +
Optional(Word(nums))).setName("real").setParseAction( cvtReal )
tupleStr = Forward()
listStr = Forward()
dictStr = Forward()
listItem = real | integer | quotedString.setParseAction(removeQuotes) | Group(listStr) | tupleStr | dictStr
tupleStr << ( Suppress("(") + delimitedList(listItem) + Optional(Suppress(",")) + Suppress(")") )
tupleStr.setParseAction( lambda t:tuple(t.asList()) )
listStr << lbrack + delimitedList(listItem) + Optional(Suppress(",")) + rbrack
dictStr << rbrace + delimitedList( Group( listItem + colon + listItem ) ) + rbrace
test = "['a', 100, ('A', [101,102]), 3.14, [ +2.718, 'xyzzy', -1.414] ]"
test = '[{0: [2], 1: []}, {0: [], 1: [], 2: []}, {0: [1, 2]}]'
print(listStr.parseString(test))
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