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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
|
# -*- coding: utf-8 -*-
import unittest
from typing import Optional, Tuple
from funcparserlib.lexer import TokenSpec, make_tokenizer, LexerError, Token
from funcparserlib.parser import (
a,
many,
NoParseError,
oneplus,
Parser,
maybe,
_Ignored, # noqa
tok,
finished,
forward_decl,
some,
)
class ParsingTest(unittest.TestCase):
def test_oneplus(self) -> None:
x = a("x")
y = a("y")
expr = oneplus(x + y)
# noinspection SpellCheckingInspection
self.assertEqual(expr.parse("xyxyxy"), ([("x", "y"), ("x", "y"), ("x", "y")]))
# Issue 31
def test_many_backtracking(self) -> None:
x = a("x")
y = a("y")
expr = many(x + y) + x + x
# noinspection SpellCheckingInspection
self.assertEqual(expr.parse("xyxyxx"), ([("x", "y"), ("x", "y")], "x", "x"))
# Issue 14
def test_error_info(self) -> None:
tokenize = make_tokenizer(
[
TokenSpec("keyword", r"\b(is|end)\b"),
TokenSpec("id", r"[a-z_]+"),
("space", (r"[ \t]+",)), # Legacy token spec
TokenSpec("nl", r"[\n\r]+"),
]
)
with self.assertRaises(LexerError) as ctx:
list(tokenize("f is ф"))
self.assertEqual(str(ctx.exception), 'cannot tokenize data: 1,6: "f is \u0444"')
def make_equality(values: Tuple[str, str]) -> Tuple[str, str]:
v1, v2 = values
return v1, v2
tok_id = tok("id")
equality = tok_id + -tok("keyword", "is") + tok_id >> make_equality
expr = equality + -tok("nl")
file = many(expr) + tok("keyword", "end")
msg = """\
spam is eggs
foo is_not bar
end"""
tokens = [x for x in tokenize(msg) if x.type != "space"]
with self.assertRaises(NoParseError) as ctx2:
file.parse(tokens)
self.assertEqual(ctx2.exception.state.pos, 4)
self.assertEqual(ctx2.exception.state.max, 5)
# May raise KeyError
t = tokens[ctx2.exception.state.max]
self.assertEqual(t, Token("id", "is_not"))
self.assertEqual((t.start, t.end), ((2, 5), (2, 10)))
self.assertEqual(
ctx2.exception.msg,
"2,5-2,10: got unexpected token: 'is_not', expected: 'is'",
)
def test_ok_ignored(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, str] = -x + y
self.assertEqual(expr.parse("xy"), "y")
def test_ignored_ok(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, str] = x + -y
self.assertEqual(expr.parse("xy"), "x")
def test_ignored_ok_ok(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, Tuple[str, str]] = -x + y + x
self.assertEqual(expr.parse("xyx"), ("y", "x"))
def test_ok_ignored_ok(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, Tuple[str, str]] = x + -y + x
self.assertEqual(expr.parse("xyx"), ("x", "x"))
def test_ok_ok_ok(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, Tuple[str, str]] = x + y + x
self.assertEqual(expr.parse("xyx"), ("x", "y", "x"))
def test_ok_ok_ignored(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, Tuple[str, str]] = x + y + -x
self.assertEqual(expr.parse("xyx"), ("x", "y"))
def test_ignored_ignored_ok(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, str] = -x + -x + y
self.assertEqual(expr.parse("xxy"), "y")
def test_ok_ignored_ignored(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, str] = x + -y + -y
self.assertEqual(expr.parse("xyy"), "x")
def test_ignored_ignored(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, _Ignored] = -x + -y
self.assertEqual(expr.parse("xy"), _Ignored("y"))
def test_ignored_ignored_ignored(self) -> None:
x = a("x")
y = a("y")
z = a("z")
expr: Parser[str, _Ignored] = -x + -y + -z
self.assertEqual(expr.parse("xyz"), _Ignored("z"))
def test_ignored_maybe(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, str] = -maybe(x) + y
self.assertEqual(expr.parse("xy"), "y")
self.assertEqual(expr.parse("y"), "y")
def test_maybe_ignored(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, Tuple[Optional[_Ignored], str]] = maybe(-x) + y
self.assertEqual(expr.parse("xy"), (_Ignored("x"), "y"))
self.assertEqual(expr.parse("y"), (None, "y"))
def test_ignored_maybe_ignored(self) -> None:
x = a("x")
y = a("y")
expr: Parser[str, Optional[str]] = -x + maybe(y) + -x
self.assertEqual(expr.parse("xyx"), "y")
self.assertEqual(expr.parse("xx"), None)
def test_compare_token_with_none(self) -> None:
# https://github.com/vlasovskikh/funcparserlib/pull/58
specs = [
("id", (r"\w+",)),
]
tokenize = make_tokenizer(specs)
tokens = list(tokenize("foo"))
expr = maybe(a(None))
self.assertEqual(expr.parse(tokens), None) # type: ignore
def test_seq_parse_error(self) -> None:
expr = a("x") + a("y")
with self.assertRaises(NoParseError) as ctx:
expr.parse("xz")
self.assertEqual(ctx.exception.msg, "got unexpected token: 'z', expected: 'y'")
def test_alt_2_parse_error(self) -> None:
expr = a("x") + (a("x") | a("y"))
with self.assertRaises(NoParseError) as ctx:
expr.parse("xz")
self.assertEqual(
ctx.exception.msg, "got unexpected token: 'z', expected: 'x' or 'y'"
)
def test_alt_3_parse_error(self) -> None:
expr = a("x") + (a("x") | a("y") | a("z"))
with self.assertRaises(NoParseError) as ctx:
expr.parse("xa")
self.assertEqual(
ctx.exception.msg,
"got unexpected token: 'a', expected: 'x' or 'y' or 'z'",
)
def test_alt_3_two_steps_parse_error(self) -> None:
expr = a("x") + (a("x") | (a("y") + a("a")))
with self.assertRaises(NoParseError) as ctx:
expr.parse("xyz")
self.assertEqual(ctx.exception.msg, "got unexpected token: 'z', expected: 'a'")
def test_expected_eof_error(self) -> None:
expr = a("x") + finished
with self.assertRaises(NoParseError) as ctx:
expr.parse("xy")
self.assertEqual(
ctx.exception.msg,
"got unexpected token: 'y', expected: end of input",
)
def test_expected_second_in_sequence_error(self) -> None:
expr = a("x") + a("y")
with self.assertRaises(NoParseError) as ctx:
expr.parse("xz")
self.assertEqual(ctx.exception.msg, "got unexpected token: 'z', expected: 'y'")
def test_forward_decl_nested_matching_error(self) -> None:
expr = forward_decl()
expr.define(a("x") + maybe(expr) + a("y"))
with self.assertRaises(NoParseError) as ctx:
expr.parse("xxy")
self.assertEqual(
ctx.exception.msg, "got unexpected end of input, expected: 'y'"
)
def test_expected_token_type_error(self) -> None:
expr = tok("number")
with self.assertRaises(NoParseError) as ctx:
expr.parse([Token("id", "x")])
self.assertEqual(
ctx.exception.msg, "got unexpected token: 'x', expected: number"
)
def test_expected_exact_token_error(self) -> None:
expr = tok("operator", "=")
with self.assertRaises(NoParseError) as ctx:
expr.parse([Token("operator", "+")])
self.assertEqual(ctx.exception.msg, "got unexpected token: '+', expected: '='")
def test_unexpected_eof(self) -> None:
expr = (a("x") + a("y")) | a("z")
with self.assertRaises(NoParseError) as ctx:
expr.parse("x")
self.assertEqual(
ctx.exception.msg, "got unexpected end of input, expected: 'y'"
)
def test_expected_transform_parsing_results_error(self) -> None:
expr = (a("1") >> int) | a("2")
with self.assertRaises(NoParseError) as ctx:
expr.parse("x")
self.assertEqual(
ctx.exception.msg, "got unexpected token: 'x', expected: '1' or '2'"
)
def test_expected_sequence_with_skipped_parts(self) -> None:
expr = (-a("x") + a("y")) | a("z")
with self.assertRaises(NoParseError) as ctx:
expr.parse("b")
self.assertEqual(
ctx.exception.msg,
"got unexpected token: 'b', expected: ('x', 'y') or 'z'",
)
def test_expected_some_without_name(self) -> None:
def lowercase(t: str) -> bool:
return t.islower()
expr = some(lowercase)
with self.assertRaises(NoParseError) as ctx:
expr.parse("A")
self.assertEqual(
ctx.exception.msg, "got unexpected token: 'A', expected: some(...)"
)
def test_expected_forward_decl_without_name(self) -> None:
nested = forward_decl()
nested.define(-a("a") + maybe(nested) + -a("z"))
expr = nested | a("x")
with self.assertRaises(NoParseError) as ctx:
expr.parse("y")
self.assertEqual(
ctx.exception.msg,
"got unexpected token: 'y', "
"expected: (('a', [ forward_decl() ]), 'z') or 'x'",
)
def test_expected_forward_decl_with_name(self) -> None:
nested = forward_decl().named("nested")
nested.define(-a("a") + maybe(nested) + -a("z"))
expr = nested | a("x")
with self.assertRaises(NoParseError) as ctx:
expr.parse("y")
self.assertEqual(
ctx.exception.msg,
"got unexpected token: 'y', expected: (('a', [ nested ]), 'z') or 'x'",
)
def test_end_of_input_after_many_alternatives(self) -> None:
brackets = a("[") + a("]")
expr = many(a("x") | brackets) + finished
with self.assertRaises(NoParseError) as ctx:
expr.parse("[")
self.assertEqual(
ctx.exception.msg, "got unexpected end of input, expected: ']'"
)
def test_parse_one_more_then_rollback_to_single(self) -> None:
mul = a("x") + many(a("*") + a("y"))
add = mul + many(a("+") + mul)
expr = add + finished
with self.assertRaises(NoParseError) as ctx:
expr.parse("x*")
self.assertEqual(
ctx.exception.msg, "got unexpected end of input, expected: 'y'"
)
def test_parse_one_more_then_rollback_to_alternative(self) -> None:
mul = a("x") + many(a("*") + a("y"))
addsub = mul + many((a("+") | a("-")) + mul)
expr = addsub + finished
with self.assertRaises(NoParseError) as ctx:
expr.parse("x*")
self.assertEqual(
ctx.exception.msg, "got unexpected end of input, expected: 'y'"
)
|
