Possible to get actual token value?-CodePudding

In Antlr4, let's say I have the following rule:

// grammar
root: TRUE eof;

// lexer
TRUE:       T R U E;
fragment T: [tT];
fragment R: [rR];
fragment U: [uU];
fragment E: [eE];

If the user enters in true the parse tree that it shows looks something like this:

  root
  /  \
TRUE EOF

But this gives me the token TRUE --

Is there a way to get the actual string value entered in, in this case true, respecting casing?

CodePudding user response：

Each token comes with an index into the input stream. Use those to extract the original text. Note that token.end is inclusive , i.e. it points to the last character that belongs to that token.