[antlr-interest] forgiving parser for expressions without a terminal

[Manaloto-Raymond]

I am trying to work with the Java grammar that is in the examples from
the download.

 

I was wondering if anybody had any suggestions on having ANTLR be more
forgiving for the expression part in the statement rule. Below is the
block I am talking about:

 

statement

            // A list of statements in curly braces -- start a new
scope!

            :           compoundStatement

 

            // declarations are ambiguous with "ID DOT" relative to
expression

            // statements.  Must backtrack to be sure.  Could use a
semantic

            // predicate to test symbol table to see what the type was
coming

            // up, but that's pretty hard without a symbol table ;)

            |           (declaration)=> declaration SEMI!

 

            // An expression statement.  This could be a method call,

            // assignment statement, or any other expression evaluated
for

            // side-effects.

            |           expression SEMI!

 

I want the expression alternative to not need the 'SEMI' terminal as I
am trying to build a very user friendly pseudo language where user's can
be allowed to "forget" to type in the terminating 'SEMI' (Like in
Javascript). Right now, if I don't require the terminating 'SEMI' I get
nondeterminism errors.

 

Any hints or ideas?

 

Any help would be greatly appreciated.

 

Raymond Manaloto

NORC

55 East Monroe Street Suite 1840
Chicago, IL 60603

Software Engineer

Work: (312) 759.5061

Fax: (312) 759.4200

Mobile: (773) 814.9666

manaloto-raymond at norc.org

AIM: sortakool

 

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