Hi,
my compiler is made of two grammars: one combined grammar parses the
language and constructs a tree while the second pass verifies the
tree. I would like to print error messages when there are semantic
errors in the second pass. For example, referencing a variable that is
not defined should result in:
line 12:9 No defined variable 'foo'
However, there is no easy way to get line and column numbers from a
CommonTreeNodeStream.
What I did was to subclass CommonTreeNodeStream and override consume()
as follows:
@Override
public void consume() {
sync(1);
Tree tree = (Tree) remove();
if (tree.getLine() > 0) {
line = tree.getLine();
charPositionInLine = tree.getCharPositionInLine();
}
}
(overriden implementation is
public void consume() {sync(1); remove();}
)
With line and charPositionInLine two fields of my subclass.
What do you think of that solution? Is there something simpler to
print semantic errors during a tree grammar parsing?
--
Damien Cassou
http://damiencassou.seasidehosting.st
"Lambdas are relegated to relative obscurity until Java makes them
popular by not having them." James Iry
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