ParseTreeListener: Getting full text of line from where token came from

[henrik sorensen]

I am using the ParseTreeWalker and ParseTreeListeners to traverse the parse tree.

When a certain ParseRuleContext is met I have a requirement to get the full text of the line from where a token was parsed.

Beside doing the brute force of reading the file until the line number, is there a better way?

Many thanks

Henrik

[Terence Parr]

hi. make an index from line number to token list as you parse maybe?

Ter

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[henrik sorensen]

yes, make sense.

-Henrik

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[Norman Dunbar]

This is what I do...

In your listener, set up a member for linenumber and or charposition.

Redefine enterEveryRule.

Token startToken = ctx.getStart ();
...
Assuming startToken is not mull then startToken.getLine () and .getCharPositionInLine ()

will get you what you want.

Cheers,
Norm.

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