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- #
- # This example demonstrates error handling using a parsing puppet in LALR
- #
- # When the parser encounters an UnexpectedToken exception, it creates a
- # parsing puppet with the current parse-state, and lets you control how
- # to proceed step-by-step. When you've achieved the correct parse-state,
- # you can resume the run by returning True.
- #
-
- from lark import UnexpectedToken, Token
-
- from .json_parser import json_parser
-
- def ignore_errors(e):
- if e.token.type == 'COMMA':
- # Skip comma
- return True
- elif e.token.type == 'SIGNED_NUMBER':
- # Try to feed a comma and retry the number
- e.puppet.feed_token(Token('COMMA', ','))
- e.puppet.feed_token(e.token)
- return True
-
- # Unhandled error. Will stop parse and raise exception
- return False
-
-
- def main():
- s = "[0 1, 2,, 3,,, 4, 5 6 ]"
- res = json_parser.parse(s, on_error=ignore_errors)
- print(res) # prints [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0]
-
- main()
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