[antlr-interest] Error nodes created upon syntax error
Johannes Luber
jaluber at gmx.de
Mon Dec 3 10:54:57 PST 2007
Terence Parr wrote:
>
> On Dec 3, 2007, at 5:05 AM, Johannes Luber wrote:
>> It makes sense, but what about single deletion/insertion in normal mode?
>
> Well, i've been thinking. I realize now that that mode is only of
> academic interest. How can you execute actions without putting in
> guards against all possible input syntax errors? That's what we call a
> parser. ;) So, upon error in a rule, you must execute no further
> actions and immediately report error, recover, and return.
I agree. Will you use then the Strategy pattern in your changed source code?
>> How do we deal with an ERROR node in the next grammar? Or is then there
>> a way to emit an error message during the construction of the AST?
>
> Well, presumably, you wouldn't pass the tree along to another
> grammar...it is malformed.
Better worded: How does this change affect the error recovery as
described in the book?
Johannes
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