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"""
Error handling using an interactive parser
==========================================
This example demonstrates error handling using an interactive parser in LALR
When the parser encounters an UnexpectedToken exception, it creates a
an interactive parser 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 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.interactive_parser.feed_token(Token('COMMA', ','))
e.interactive_parser.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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