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LibJS: Implement While statements

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This commit is contained in:
howar6hill 2020-03-09 03:22:21 +08:00 • committed by Andreas Kling
parent 4dee1ec0be
commit 1c83c5ed08
2 changed files with 41 additions and 0 deletions
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20
Libraries/LibJS/AST.cpp
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@ -71,6 +71,16 @@ Value IfStatement::execute(Interpreter& interpreter) const
return interpreter.run(*m_alternate);
}
Value WhileStatement::execute(Interpreter& interpreter) const
{
Value last_value = js_undefined();
while (m_predicate->execute(interpreter).as_bool()) {
last_value = interpreter.run(*m_body);
}
return last_value;
}
Value add(Value lhs, Value rhs)
{
ASSERT(lhs.is_number());
@ -259,4 +269,14 @@ void IfStatement::dump(int indent) const
alternate().dump(indent + 1);
}
void WhileStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
printf("While\n");
predicate().dump(indent + 1);
body().dump(indent + 1);
}
}

21
Libraries/LibJS/AST.h
View file

@ -151,6 +151,27 @@ private:
NonnullOwnPtr<ScopeNode> m_alternate;
};
class WhileStatement : public ASTNode {
public:
WhileStatement(NonnullOwnPtr<Expression> predicate, NonnullOwnPtr<ScopeNode> body)
: m_predicate(move(predicate))
, m_body(move(body))
{
}
const Expression& predicate() const { return *m_predicate; }
const ScopeNode& body() const { return *m_body; }
virtual Value execute(Interpreter&) const override;
virtual void dump(int indent) const override;
private:
virtual const char* class_name() const override { return "WhileStatement"; }
NonnullOwnPtr<Expression> m_predicate;
NonnullOwnPtr<ScopeNode> m_body;
};
enum class BinaryOp {
Plus,
Minus,