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LibSQL: Implement evaluate() method of BinaryOperatorExpression

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Mostly just calls the appropriate methods on the Value objects.
Exception are the `Concatenate` (string concat), and the logical `and`
and `or` operators which are implemented directly in
`BinaryOperatorExpression::evaluate`
This commit is contained in:
Jan de Visser 2021-10-21 18:10:25 -04:00 • committed by Andreas Kling
parent 73fc023652
commit 9d1e27d8a8
2 changed files with 67 additions and 0 deletions
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66
Userland/Libraries/LibSQL/AST/Expression.cpp
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@ -49,6 +49,72 @@ Value ChainedExpression::evaluate(ExecutionContext& context) const
return ret;
}
Value BinaryOperatorExpression::evaluate(ExecutionContext& context) const
{
Value lhs_value = lhs()->evaluate(context);
Value rhs_value = rhs()->evaluate(context);
switch (type()) {
case BinaryOperator::Concatenate: {
if (lhs_value.type() != SQLType::Text) {
VERIFY_NOT_REACHED();
}
AK::StringBuilder builder;
builder.append(lhs_value.to_string());
builder.append(rhs_value.to_string());
return Value(builder.to_string());
}
case BinaryOperator::Multiplication:
return lhs_value.multiply(rhs_value);
case BinaryOperator::Division:
return lhs_value.divide(rhs_value);
case BinaryOperator::Modulo:
return lhs_value.modulo(rhs_value);
case BinaryOperator::Plus:
return lhs_value.add(rhs_value);
case BinaryOperator::Minus:
return lhs_value.subtract(rhs_value);
case BinaryOperator::ShiftLeft:
return lhs_value.shift_left(rhs_value);
case BinaryOperator::ShiftRight:
return lhs_value.shift_right(rhs_value);
case BinaryOperator::BitwiseAnd:
return lhs_value.bitwise_and(rhs_value);
case BinaryOperator::BitwiseOr:
return lhs_value.bitwise_or(rhs_value);
case BinaryOperator::LessThan:
return Value(lhs_value.compare(rhs_value) < 0);
case BinaryOperator::LessThanEquals:
return Value(lhs_value.compare(rhs_value) <= 0);
case BinaryOperator::GreaterThan:
return Value(lhs_value.compare(rhs_value) > 0);
case BinaryOperator::GreaterThanEquals:
return Value(lhs_value.compare(rhs_value) >= 0);
case BinaryOperator::Equals:
return Value(lhs_value.compare(rhs_value) == 0);
case BinaryOperator::NotEquals:
return Value(lhs_value.compare(rhs_value) != 0);
case BinaryOperator::And: {
auto lhs_bool_maybe = lhs_value.to_bool();
auto rhs_bool_maybe = rhs_value.to_bool();
if (!lhs_bool_maybe.has_value() || !rhs_bool_maybe.has_value()) {
// TODO Error handling
VERIFY_NOT_REACHED();
}
return Value(lhs_bool_maybe.value() && rhs_bool_maybe.value());
}
case BinaryOperator::Or: {
auto lhs_bool_maybe = lhs_value.to_bool();
auto rhs_bool_maybe = rhs_value.to_bool();
if (!lhs_bool_maybe.has_value() || !rhs_bool_maybe.has_value()) {
// TODO Error handling
VERIFY_NOT_REACHED();
}
return Value(lhs_bool_maybe.value() || rhs_bool_maybe.value());
}
}
VERIFY_NOT_REACHED();
}
Value UnaryOperatorExpression::evaluate(ExecutionContext& context) const
{
Value expression_value = NestedExpression::evaluate(context);