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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.cpp
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@@ -114,6 +114,22 @@ Value BinaryExpression::execute(Interpreter& interpreter) const
ASSERT_NOT_REACHED();
}
Value LogicalExpression::execute(Interpreter& interpreter) const
{
auto lhs_result = m_lhs->execute(interpreter).as_bool();
if (m_op == LogicalOp::Not)
return Value(!lhs_result);
auto rhs_result = m_rhs->execute(interpreter).as_bool();
switch (m_op) {
case LogicalOp::And:
return Value(lhs_result && rhs_result);
case LogicalOp::Or:
return Value(lhs_result || rhs_result);
case LogicalOp::Not:
ASSERT_NOT_REACHED();
}
ASSERT_NOT_REACHED();
@@ -161,6 +177,24 @@ void BinaryExpression::dump(int indent) const
m_rhs->dump(indent + 1);
}
void LogicalExpression::dump(int indent) const
{
const char* op_string = nullptr;
switch (m_op) {
case LogicalOp::And:
op_string = "&&";
break;
case LogicalOp::Or:
op_string = "||";
break;
case LogicalOp::Not:
op_string = "!";
print_indent(indent);
printf("%s\n", class_name());
print_indent(indent + 1);
printf("%s\n", op_string);
m_lhs->dump(indent + 1);
return;
}
print_indent(indent);

34
Libraries/LibJS/AST.h
View File

@@ -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)