CODEWITHSUNDEEP
antlrantlr4
Angie
Angie

Reputation: 339

Switching Antlr lexer modes from parser

How to control switching Antlr lexer modes from parser actions? I extended the generated Parser and Lexer so I can call pushMode and popMode from parser witch in turn call suitable pushMode and popMode of lexer but with no effect. Is there any thing I can do to activate this functionality?

Upvotes: 7

Views: 1434

Answers (1)

Sam Harwell
Sam Harwell

Reputation: 99869

Your lexer should be written such that the input can be completely tokenized before the parser is even created. Even though the token stream is lazily filled, ANTLR 4 is not guaranteed to correctly parse the input if your lexer does not meet this requirement.

Upvotes: 8

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