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dee9fba | 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 | import json
import unittest
from unittest import TestCase
from lark import Lark
from lark.reconstruct import Reconstructor
common = """
%import common (WS_INLINE, NUMBER, WORD)
%ignore WS_INLINE
"""
def _remove_ws(s):
return s.replace(' ', '').replace('\n','')
class TestReconstructor(TestCase):
def assert_reconstruct(self, grammar, code):
parser = Lark(grammar, parser='lalr', maybe_placeholders=False)
tree = parser.parse(code)
new = Reconstructor(parser).reconstruct(tree)
self.assertEqual(_remove_ws(code), _remove_ws(new))
def test_starred_rule(self):
g = """
start: item*
item: NL
| rule
rule: WORD ":" NUMBER
NL: /(\\r?\\n)+\\s*/
""" + common
code = """
Elephants: 12
"""
self.assert_reconstruct(g, code)
def test_starred_group(self):
g = """
start: (rule | NL)*
rule: WORD ":" NUMBER
NL: /(\\r?\\n)+\\s*/
""" + common
code = """
Elephants: 12
"""
self.assert_reconstruct(g, code)
def test_alias(self):
g = """
start: line*
line: NL
| rule
| "hello" -> hi
rule: WORD ":" NUMBER
NL: /(\\r?\\n)+\\s*/
""" + common
code = """
Elephants: 12
hello
"""
self.assert_reconstruct(g, code)
def test_keep_tokens(self):
g = """
start: (NL | stmt)*
stmt: var op var
!op: ("+" | "-" | "*" | "/")
var: WORD
NL: /(\\r?\\n)+\s*/
""" + common
code = """
a+b
"""
self.assert_reconstruct(g, code)
def test_expand_rule(self):
g = """
?start: (NL | mult_stmt)*
?mult_stmt: sum_stmt ["*" sum_stmt]
?sum_stmt: var ["+" var]
var: WORD
NL: /(\\r?\\n)+\s*/
""" + common
code = ['a', 'a*b', 'a+b', 'a*b+c', 'a+b*c', 'a+b*c+d']
for c in code:
self.assert_reconstruct(g, c)
def test_json_example(self):
test_json = '''
{
"empty_object" : {},
"empty_array" : [],
"booleans" : { "YES" : true, "NO" : false },
"numbers" : [ 0, 1, -2, 3.3, 4.4e5, 6.6e-7 ],
"strings" : [ "This", [ "And" , "That", "And a \\"b" ] ],
"nothing" : null
}
'''
json_grammar = r"""
?start: value
?value: object
| array
| string
| SIGNED_NUMBER -> number
| "true" -> true
| "false" -> false
| "null" -> null
array : "[" [value ("," value)*] "]"
object : "{" [pair ("," pair)*] "}"
pair : string ":" value
string : ESCAPED_STRING
%import common.ESCAPED_STRING
%import common.SIGNED_NUMBER
%import common.WS
%ignore WS
"""
json_parser = Lark(json_grammar, parser='lalr', maybe_placeholders=False)
tree = json_parser.parse(test_json)
new_json = Reconstructor(json_parser).reconstruct(tree)
self.assertEqual(json.loads(new_json), json.loads(test_json))
if __name__ == '__main__':
unittest.main()
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