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| author | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
|---|---|---|
| committer | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
| commit | 27e183a78c8062ed7c2bbb91655a5e56cd697bba (patch) | |
| tree | 88fd355a0cc6da4c130582e092d702836596cbb2 /examples/parsePythonValue.py | |
| parent | 4ba589cf13588e90992e23deb5a9784340efd2cc (diff) | |
| download | pyparsing-git-27e183a78c8062ed7c2bbb91655a5e56cd697bba.tar.gz | |
Move src to root
Diffstat (limited to 'examples/parsePythonValue.py')
| -rw-r--r-- | examples/parsePythonValue.py | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/examples/parsePythonValue.py b/examples/parsePythonValue.py new file mode 100644 index 0000000..53c61fc --- /dev/null +++ b/examples/parsePythonValue.py @@ -0,0 +1,70 @@ +# parsePythonValue.py
+#
+# Copyright, 2006, by Paul McGuire
+#
+from __future__ import print_function
+from pyparsing import *
+
+
+cvtBool = lambda t:t[0]=='True'
+cvtInt = lambda toks: int(toks[0])
+cvtReal = lambda toks: float(toks[0])
+cvtTuple = lambda toks : tuple(toks.asList())
+cvtDict = lambda toks: dict(toks.asList())
+cvtList = lambda toks: [toks.asList()]
+
+# define punctuation as suppressed literals
+lparen,rparen,lbrack,rbrack,lbrace,rbrace,colon = \
+ map(Suppress,"()[]{}:")
+
+integer = Regex(r"[+-]?\d+")\
+ .setName("integer")\
+ .setParseAction( cvtInt )
+real = Regex(r"[+-]?\d+\.\d*([Ee][+-]?\d+)?")\
+ .setName("real")\
+ .setParseAction( cvtReal )
+tupleStr = Forward()
+listStr = Forward()
+dictStr = Forward()
+
+unicodeString.setParseAction(lambda t:t[0][2:-1].decode('unicode-escape'))
+quotedString.setParseAction(lambda t:t[0][1:-1].decode('string-escape'))
+boolLiteral = oneOf("True False").setParseAction(cvtBool)
+noneLiteral = Literal("None").setParseAction(replaceWith(None))
+
+listItem = real|integer|quotedString|unicodeString|boolLiteral|noneLiteral| \
+ Group(listStr) | tupleStr | dictStr
+
+tupleStr << ( Suppress("(") + Optional(delimitedList(listItem)) +
+ Optional(Suppress(",")) + Suppress(")") )
+tupleStr.setParseAction( cvtTuple )
+
+listStr << (lbrack + Optional(delimitedList(listItem) +
+ Optional(Suppress(","))) + rbrack)
+listStr.setParseAction(cvtList, lambda t: t[0])
+
+dictEntry = Group( listItem + colon + listItem )
+dictStr << (lbrace + Optional(delimitedList(dictEntry) + \
+ Optional(Suppress(","))) + rbrace)
+dictStr.setParseAction( cvtDict )
+
+tests = """['a', 100, ('A', [101,102]), 3.14, [ +2.718, 'xyzzy', -1.414] ]
+ [{0: [2], 1: []}, {0: [], 1: [], 2: []}, {0: [1, 2]}]
+ { 'A':1, 'B':2, 'C': {'a': 1.2, 'b': 3.4} }
+ 3.14159
+ 42
+ 6.02E23
+ 6.02e+023
+ 1.0e-7
+ 'a quoted string'""".split("\n")
+
+for test in tests:
+ print("Test:", test.strip())
+ result = listItem.parseString(test)[0]
+ print("Result:", result)
+ try:
+ for dd in result:
+ if isinstance(dd,dict): print(list(dd.items()))
+ except TypeError as te:
+ pass
+ print()
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