[antlr-interest] "error reporting + paraphrase mechanism + cdfa.predict" problem

Amr Muhammad amr.muhammad.w at gmail.com
Sun Nov 28 01:38:21 PST 2010


Hello,

I am trying to implement the paraphrase mechanism explained in the textbook
ch.10 p.240. However, an exception is raised before the rule gets a chance
to be called.

I have a rule like this:

rule1: (rule2 (a+ b* | b* a+) )* (rule2 a*)*

rule2 calls other rules which deep down implement the paraphrase mechanism

when i looked at the generated code, it seems that the rule1 function would
call sth like : cdfa9.predict(....)
This predict method is what makes the parser go to exception state and would
not execute the function for rule2

i am not sure what i am doing wrong here.. Appreciate your guidance.

Thank you for your time :)

Amr Muhammad
Cairo Univ. Computer Eng. Grad.
twitter:@amrmuhammad <http://twitter.com/amrmuhammad>


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