Hi,
Is anybody using scopes? E.g., here is the use C grammar:
scope Symbols {
Set types; // only track types in order to get parser working
}
Every rule that declares its usage of Symbols pushes a new copy on the stack
effectively creating a new symbol scope.
translation_unit
scope Symbols; // entire file is a scope
@init {
$Symbols::types = new HashSet();
}
: external_declaration+
;
Then rule declaration declares a rule scope that lets any invoked rule see
isTypedef boolean. It's much easier than passing that info down as parameters:
declaration
scope {
boolean isTypedef;
}
@init {
$declaration::isTypedef = false;
}
: 'typedef' declaration_specifiers? {$declaration::isTypedef=true;}
init_declarator_list ';' // special case, looking for typedef
| declaration_specifiers init_declarator_list? ';'
;
Rule direct_declarator can then easily determine whether the IDENTIFIER
should be declared as a type name.
direct_declarator
: ( IDENTIFIER
{
if ($declaration.size()>0&&$declaration::isTypedef) {
$Symbols::types.add($IDENTIFIER.text);
System.out.println("define type "+$IDENTIFIER.text);
}
}
| '(' declarator ')'
)
declarator_suffix*
;
Trying to decide if it's worth reimplementing for v4.
Ter
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