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
|
# parsePythonValue.py
#
# Copyright, 2006, by Paul McGuire
#
import pyparsing as pp
cvtBool = lambda t: t[0] == "True"
cvtInt = lambda toks: int(toks[0])
cvtReal = lambda toks: float(toks[0])
cvtTuple = lambda toks: tuple(toks.as_list())
cvtDict = lambda toks: dict(toks.as_list())
cvtList = lambda toks: [toks.as_list()]
# define punctuation as suppressed literals
lparen, rparen, lbrack, rbrack, lbrace, rbrace, colon, comma = pp.Suppress.using_each("()[]{}:,")
integer = pp.Regex(r"[+-]?\d+").set_name("integer").add_parse_action(cvtInt)
real = pp.Regex(r"[+-]?\d+\.\d*([Ee][+-]?\d+)?").set_name("real").add_parse_action(cvtReal)
tupleStr = pp.Forward().set_name("tuple_expr")
listStr = pp.Forward().set_name("list_expr")
dictStr = pp.Forward().set_name("dict_expr")
unistr = pp.unicodeString().add_parse_action(lambda t: t[0][2:-1])
quoted_str = pp.quotedString().add_parse_action(lambda t: t[0][1:-1])
boolLiteral = pp.oneOf("True False", as_keyword=True).add_parse_action(cvtBool)
noneLiteral = pp.Keyword("None").add_parse_action(pp.replace_with(None))
listItem = (
real
| integer
| quoted_str
| unistr
| boolLiteral
| noneLiteral
| pp.Group(listStr)
| tupleStr
| dictStr
).set_name("list_item")
tupleStr <<= (
lparen + pp.Opt(pp.DelimitedList(listItem, allow_trailing_delim=True)) + rparen
)
tupleStr.add_parse_action(cvtTuple)
listStr <<= (
lbrack + pp.Opt(pp.DelimitedList(listItem, allow_trailing_delim=True)) + rbrack
)
listStr.add_parse_action(cvtList, lambda t: t[0])
dictEntry = pp.Group(listItem + colon + listItem).set_name("dict_entry")
dictStr <<= (
lbrace + pp.Opt(pp.DelimitedList(dictEntry, allow_trailing_delim=True)) + rbrace
)
dictStr.add_parse_action(cvtDict)
if __name__ == "__main__":
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'"""
listItem.runTests(tests)
|
