fix: Cpp $rule.text fail if $rule is nullptr #4832
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With a grammar like this:
```antlr
rule: (VAL | VAR {
is_constant = false;
}) name=IDENTIFIER (COLON type {
type_name = $type.text; <-- we look this line
})? (EQ value=expression {
value = $value.tree;
})?
```
When generating for Cpp target we get this specific result:
```cpp
type_name = (antlrcpp::downCast<Variable_declarationContext *>(_localctx)->typeContext != nullptr ? _input->getText(antlrcpp::downCast<Variable_declarationContext *>(_localctx)->typeContext->start, antlrcpp::downCast<Variable_declarationContext *>(_localctx)->typeContext->stop) : nullptr);
```
If input doesn't match the `type` branch then we fallback on nullptr. As
of cpp23 standard this line doesn't compile as it waits for
`std::string`.
AS `Token::getText` returns `std::string`, then fallback value should be
empty string
Signed-off-by: Kevin Traini <[email protected]>
Gashmob
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With a grammar like this:
When generating for Cpp target we get this specific result:
If input doesn't match the
typebranch then we fallback on nullptr. As of cpp23 standard this line doesn't compile as it waits forstd::string.AS
Token::getTextreturnsstd::string, then fallback value should be empty string