是否有可能获得一个默认令牌，该令牌不会覆盖ANTLR3中已存在的令牌？

Question

我有一个要求，其中我已将Lexer令牌写为：

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

但如果输入为：

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

在这种情况下，预期的行为是它应该使用令牌IF_LEXER_TOKEN作为第一行，ANY令牌作为第二行，而是考虑两行的ANY令牌。请帮助。注意：由于某些限制，我无法为上述场景创建解析器规则。

Answer 1

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