[antlr-interest] Beginner Question: What are the steps to get a rules's corresponding text in the parser ?

[Anthony Brenelière]

I did not see how does tree parsers mecanism work.
 
I made a lexer and a parser, it compiles well and it seems to work.
 
I know to have a token’s corresponding text in the lexer we use the
.getText() method.
 
What are the steps to get a rules’s corresponding text in the parser ?
Is “buildAST = true” option needed ?
 
Cordially,
Anthony
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