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LibJS: Implement logical expressions

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Logical expressions are expressions which can return either true or
false according to a provided condition.
This commit is contained in:
0xtechnobabble 2020-03-08 07:55:44 +02:00 • committed by Andreas Kling
parent 4e62dcd6e6
commit a96bf2c22e
2 changed files with 68 additions and 0 deletions
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34
Libraries/LibJS/AST.h
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@ -27,6 +27,7 @@
#pragma once
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/String.h>
#include <LibJS/Forward.h>
#include <LibJS/Value.h>
@ -152,6 +153,39 @@ private:
NonnullOwnPtr<Expression> m_rhs;
};
enum class LogicalOp {
And,
Or,
Not
};
class LogicalExpression : public Expression {
public:
LogicalExpression(LogicalOp op, NonnullOwnPtr<Expression> lhs, NonnullOwnPtr<Expression> rhs)
: m_op(op)
, m_lhs(move(lhs))
, m_rhs(move(rhs))
{
}
LogicalExpression(LogicalOp op, NonnullOwnPtr<Expression> lhs)
: m_op(op)
, m_lhs(move(lhs))
{
ASSERT(op == LogicalOp::Not);
}
virtual Value execute(Interpreter&) const override;
virtual void dump(int indent) const override;
private:
virtual const char* class_name() const override { return "LogicalExpression"; }
LogicalOp m_op;
NonnullOwnPtr<Expression> m_lhs;
OwnPtr<Expression> m_rhs;
};
class Literal : public Expression {
public:
explicit Literal(Value value)