// castExpr ::= 'int' '(' expr ')'
// | 'string' '(' expr ')'
// | 'bool' '(' expr ')'
std::unique_ptr<Expr> FlowParser::castExpr()
{
FNTRACE();
FlowLocation sloc(location());
FlowToken targetTypeToken = token();
nextToken();
if (!consume(FlowToken::RndOpen))
return nullptr;
std::unique_ptr<Expr> e(expr());
if (!consume(FlowToken::RndClose))
return nullptr;
if (!e)
return nullptr;
Opcode targetType = makeOperator(targetTypeToken, e.get());
if (targetType == Opcode::EXIT) {
reportError("Type cast error. No cast implementation found for requested cast from %s to %s.",
tos(e->getType()).c_str(), targetTypeToken.c_str());
return nullptr;
}
if (targetType == Opcode::NOP) {
return e;
}
printf("Type cast from %s to %s: %s\n", tos(e->getType()).c_str(), targetTypeToken.c_str(), mnemonic(targetType));
return std::make_unique<UnaryExpr>(targetType, std::move(e), sloc.update(end()));
}
bool FlowParser::consume(FlowToken value)
{
if (token() != value) {
reportError("Unexpected token '%s' (expected: '%s')", token().c_str(), value.c_str());
return false;
}
nextToken();
return true;
}
std::string FlowLexer::tokenToString(FlowToken value) const
{
return value.c_str();
}
