浏览代码

Renamed json_example to json_parser

tags/gm/2021-09-23T00Z/github.com--lark-parser-lark/0.5.1
Erez Shinan 7 年前
父节点
当前提交
c2dbad1335
共有 1 个文件被更改,包括 0 次插入64 次删除
  1. +0
    -64
      examples/json_example.py

+ 0
- 64
examples/json_example.py 查看文件

@@ -1,64 +0,0 @@
import sys
from lark.lark import Lark, inline_args
from lark.tree import Transformer

json_grammar = r"""
?start: value

?value: object
| array
| string
| number
| "true" -> true
| "false" -> false
| "null" -> null

array : "[" [value ("," value)*] "]"
object : "{" [pair ("," pair)*] "}"
pair : string ":" value

number : /-?\d+(\.\d+)?([eE][+-]?\d+)?/
string : /".*?(?<!\\)"/

WS.ignore.newline: /[ \t\n]+/
"""

class TreeToJson(Transformer):
@inline_args
def string(self, s):
return s[1:-1]

array = list
pair = tuple
object = dict
number = inline_args(float)

null = lambda self, _: None
true = lambda self, _: True
false = lambda self, _: False

json_parser = Lark(json_grammar, parser='lalr', transformer=TreeToJson())
parse = json_parser.parse

def test():
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" ] ],
"nothing" : null
}
'''

j = parse(test_json)
print j
import json
assert j == json.loads(test_json)

if __name__ == '__main__':
test()
with open(sys.argv[1]) as f:
print parse(f.read())


正在加载...
取消
保存