[antlr-interest] Truely, a BASIC question
robgreene at gmail.com
Mon Nov 21 19:38:05 PST 2005
I am most definitely new to ANTLR. I'm working out a grammar file for
a BASICish language where line endings are important. Language
statements do not end with a colon uniformly - instead it is most
likely a newline that separates statements. I haven't discovered any
tutorials that covers this and haven't located any information in the
What I've tried:
* optionally allow the colon separator - but that allows stuff like
"goto this goto that" instead of requiring a colon/newline between
commands ("goto this : goto that").
* pulled newline out of the WS variable (?? terminology) in my grammar
file and added a separator rule of "( COLON | NEWLINE )+" to require
one or more separators and then attempt to use the rule appropriately.
This seems to work, but I get odd errors:
line 8:15: unexpected token:
line 9:9: unexpected token:
line 10:1: unexpected token:
line 11:1: unexpected token: gosub
Which appear (to the novice) to imply my separator are hosing up the
Are there any gotchas in the grammar rules I need to look out for?
I've included what I have at this point for the grammar file (with the
really clever name of rbasic).
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