Here are a couple of simple rules extracted from a combined grammar I have:
RETURNS : ('R'|'r')'eturns' { $text
= "RETURNS"; } ;
returnsStatement
: RETURNS ':' type ';' ->
^(RETURNS type)
;
(type's definition is, I think, irrelevant. It matches the typical things -
int, double, etc.).
Note that the rule uses the rewrite syntax and omits the ':' and ';' tokens in
the AST.
I am observing that my parser accepts inputs even when these tokens are missing.
For example, the line: "returns double" is accepted (note, no ':' or ';').
In stepping through the parse, the Match() method calls that should match the
':' and ';' return '<missing ':'>' and '<missing ';'>', respectively, yet do
not fail. I understand that a feature of ANTLR is that missing tokens are
sometimes automatically inserted to allow the parse to proceed, but shouldn't
the erroneous line(s) be reported?
Is this behavior correct and/or expected? If not, does anyone have any clues
as to what might be going wrong?
Thanks,
Kevin Carroll
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