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| author | Paul McGuire <ptmcg@austin.rr.com> | 2012-10-02 04:55:56 +0000 |
|---|---|---|
| committer | Paul McGuire <ptmcg@austin.rr.com> | 2012-10-02 04:55:56 +0000 |
| commit | a7f9dda0668bfce4fba51df1bf2976b4a93a8bd5 (patch) | |
| tree | 57ea8bcf2e66532a36c833a7bc57cff9d5d0e4dd /src/examples/parseListString.py | |
| parent | f5d2b716ffb57b65660a7ee0bbf04332dfb29620 (diff) | |
| download | pyparsing-git-a7f9dda0668bfce4fba51df1bf2976b4a93a8bd5.tar.gz | |
Add example files to SVN
Diffstat (limited to 'src/examples/parseListString.py')
| -rw-r--r-- | src/examples/parseListString.py | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/examples/parseListString.py b/src/examples/parseListString.py new file mode 100644 index 0000000..eb784c7 --- /dev/null +++ b/src/examples/parseListString.py @@ -0,0 +1,100 @@ +# 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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