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
|
# ruff: noqa: S102
import types
import pytest
import tatsu
from tatsu.exceptions import FailedParse
INPUT = """
1d3
"""
OUTPUT = {'number_of_dice': '1', 'sides': '3'}
GRAMMAR = r"""
start = expression $;
int = /-?\d+/ ;
dice = number_of_dice:factor /d|D/ sides:factor;
expression = addition ;
addition
=
| left:dice_expr op:('+' | '-') ~ right:addition
| dice_expr
;
dice_expr
=
| dice
| factor
;
factor
=
| '(' ~ @:expression ')'
| int
;
"""
def generate_and_load_parser(name, grammar):
code = tatsu.to_python_sourcecode(grammar, name='Test')
print(code)
module = types.ModuleType(name)
module.__file__ = '<generated>'
exec(compile(code, module.__file__, 'exec'), module.__dict__)
return module.TestParser()
def test_model_parse():
model = tatsu.compile(name='Test', grammar=GRAMMAR)
assert model.parse(INPUT) == OUTPUT
def test_codegen_parse():
parser = generate_and_load_parser('test_codegen_parse', GRAMMAR)
output = parser.parse(INPUT, parseinfo=False)
assert output == OUTPUT
# @pytest.mark.skip('work in progress')
def test_error_messages():
grammar = """
@@grammar :: ORDER
alphabet = a b others $ ;
a = 'a' ;
b = 'b' ;
others = 'c' | 'd' | 'e' | 'f' |'g' | 'h' | 'i' | 'j' | 'k' | 'l' | 'm' | 'n' | 'o';
"""
input = 'a b'
e1 = None
model = tatsu.compile(grammar)
try:
model.parse(input)
except FailedParse as e:
e1 = str(e)
assert (
"expecting one of: 'c' 'd' 'e' 'f' 'g' 'h' 'i' 'j' 'k' 'l' 'm' 'n' 'o'"
in e1
)
# @pytest.mark.skip('work in progress')
def test_name_checked():
grammar = r"""
@@grammar :: Test
@@ignorecase :: True
@@keyword :: if
start = rule ;
rule = @:word if_exp $ ;
if_exp = 'if' digit ;
@name word = /\w+/ ;
digit = /\d/ ;
"""
def subtest(parser):
parser.parse('nonIF if 1', trace=False)
with pytest.raises(FailedParse):
parser.parse('if if 1', trace=False)
with pytest.raises(FailedParse):
parser.parse('IF if 1', trace=False)
parser = tatsu.compile(grammar, 'Test')
subtest(parser)
parser = generate_and_load_parser('test_name_checked', grammar)
subtest(parser)
def test_first_rule():
grammar = """
@@grammar :: Test
true = 'test' @: `True` $ ;
start = 'test' @: `False` $ ;
"""
parser = tatsu.compile(grammar, 'Test')
ast = parser.parse('test')
assert ast is True
parser = generate_and_load_parser('test_first_rule', grammar)
ast = parser.parse('test')
assert ast is True
def test_dynamic_compiled_ast():
grammar = r"""
test::Test = 'TEST' ['A' a:number] ['B' b:number] ;
number::int = /\d+/ ;
"""
parser = tatsu.compile(grammar)
code = tatsu.to_python_sourcecode(grammar, name='Test', filename='test.py')
module = types.ModuleType('test')
module.__file__ = 'test.py'
exec(
compile(code, module.__file__, 'exec'), module.__dict__,
) # pylint: disable=exec-used, no-member
dynamic_ast = parser.parse('TEST')
compiled_ast = module.TestParser().parse(
'TEST', start='test',
) # pylint: disable=no-member
assert dynamic_ast == compiled_ast
dynamic_ast = parser.parse('TEST A 1')
compiled_ast = module.TestParser().parse(
'TEST A 1', start='test',
) # pylint: disable=no-member
assert dynamic_ast == compiled_ast
def test_none_whitespace():
grammar = """
@@whitespace:: None
start = "This is a" test;
test = " test";
"""
input = 'This is a test'
parser = tatsu.compile(grammar)
output = parser.parse(input)
assert output == ('This is a', ' test')
parser = generate_and_load_parser('W', grammar)
output = parser.parse(input, parseinfo=False)
assert output == ('This is a', ' test')
def test_sep_join():
grammar = r"""
@@grammar::numbers
start
= expression $
;
expression
= ~ ( "," )%{ digit }+
;
digit = /\d+/ ;
"""
parser = generate_and_load_parser('W', grammar)
parser.parse('1,2,3,4', nameguard=False)
|
