public object visitExprTernaryExpr(ExprTernary expr)
{
resolve(expr.top);
resolve(expr.left);
resolve(expr.right);
return(null);
}
private Expr ternaryConditionalExpr()
{
if (match(TokenType.QMARK))
{
Token operatorExpr = previous();
Expr right = assignmentExpr();
if (match(TokenType.COLON))
{
right = assignmentExpr();
}
throw error(operatorExpr, "Expected expression before '" + operatorExpr.lexeme + "'.");
}
Expr expr = assignmentExpr();
if (match(TokenType.QMARK))
{
Token operatorExpr1 = previous();
Expr leftExpr = assignmentExpr();
if (match(TokenType.COLON))
{
Token operatorExpr2 = previous();
Expr rightExpr = assignmentExpr();
expr = new ExprTernary(expr, operatorExpr1, leftExpr, operatorExpr2, rightExpr);
}
else
{
expr = new ExprLogical(expr, operatorExpr1, leftExpr);
}
}
return(expr);
}
public object visitExprTernaryExpr(ExprTernary expr)
{
object top = evaluate(expr.top);
switch (expr.topOperator.type)
{
case TokenType.QMARK:
if (isTruthy(top))
{
return(evaluate(expr.left));
}
else
{
return(evaluate(expr.right));
}
default:
return(null);
}
}
public object visitExprTernaryExpr(ExprTernary expr)
{
return(parenthesize(expr.eOperator.lexeme + ' ' + expr.eOperator.lexeme, expr.top, expr.left, expr.right));
}