1 files changed, 67 insertions, 0 deletions
diff --git a/src/examples/parsePythonValue.py b/src/examples/parsePythonValue.py
new file mode 100644
index 0000000..d9671fa
--- /dev/null
+++ b/src/examples/parsePythonValue.py
@@ -0,0 +1,67 @@
+# parsePythonValue.py
+#
+# Copyright, 2006, by Paul McGuire
+#
+
+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())
+
+# 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)
+
+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 dd.items()
+    except TypeError,te:
+        pass
+    print