Templates

This example shows how to use Lark’s templates to achieve cleaner grammars

from lark import Lark

grammar = r"""
start: list | dict

list: "[" _seperated{atom, ","} "]"
dict: "{" _seperated{key_value, ","} "}"
key_value: atom ":" atom

_seperated{x, sep}: x (sep x)*  // Define a sequence of 'x sep x sep x ...'

atom: NUMBER | ESCAPED_STRING

%import common (NUMBER, ESCAPED_STRING, WS)
%ignore WS
"""


parser = Lark(grammar)

print(parser.parse('[1, "a", 2]'))
print(parser.parse('{"a": 2, "b": 6}'))