CODEWITHSUNDEEP
c#antlr3
shruti
shruti

Reputation: 13

Is it possible to get a default token which doesn't overrides the already present tokens in ANTLR3?

I have a requirement wherein I have written the Lexer token as:

IF_LEXER_TOKEN: 'IF' (.)* 'END_IF'
ANY :(options {greedy=true;}: .)* ;

But if the input is given as:

IF a>b then a=b END_IF
IF c>d then c=d

In this case the expected behavior is that it should use the token IF_LEXER_TOKEN for first line and ANY token for second line, but instead its considering the ANY token for both lines. Kindly help. Note:Due to some constraints I can't create a parser rule for the above scenario.

Upvotes: 1

Views: 39

Answers (1)

Bart Kiers
Bart Kiers

Reputation: 170227

My answer would be: don't do what you're trying to do. Never use .* or .+ at the end of a lexer rule: it consumes everything until EOF.

I don't know exactly what you're trying to do, but it seems to me you're trying to get an answer to problem Y1, while you ought to be explaining problem X1.

1 https://meta.stackexchange.com/questions/66377/what-is-the-xy-problem

Upvotes: 0

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