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LibJS: Function.length respects default and rest parameters

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"[Function.length is] the number of formal parameters. This number
excludes the rest parameter and only includes parameters before
the first one with a default value." - MDN
This commit is contained in:
Matthew Olsson 2020-05-05 20:02:14 -07:00 • committed by Andreas Kling
parent 2c14714ee0
commit 838390171c
6 changed files with 43 additions and 15 deletions
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13
Libraries/LibJS/AST.h
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@ -166,23 +166,26 @@ public:
const Vector<Parameter>& parameters() const { return m_parameters; };
protected:
FunctionNode(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
FunctionNode(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, i32 function_length, NonnullRefPtrVector<VariableDeclaration> variables)
: m_name(name)
, m_body(move(body))
, m_parameters(move(parameters))
, m_variables(move(variables))
, m_function_length(function_length)
{
}
void dump(int indent, const char* class_name) const;
const NonnullRefPtrVector<VariableDeclaration>& variables() const { return m_variables; }
i32 function_length() const { return m_function_length; }
private:
FlyString m_name;
NonnullRefPtr<Statement> m_body;
const Vector<Parameter> m_parameters;
NonnullRefPtrVector<VariableDeclaration> m_variables;
const i32 m_function_length;
};
class FunctionDeclaration final
@ -191,8 +194,8 @@ class FunctionDeclaration final
public:
static bool must_have_name() { return true; }
FunctionDeclaration(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
: FunctionNode(name, move(body), move(parameters), move(variables))
FunctionDeclaration(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, i32 function_length, NonnullRefPtrVector<VariableDeclaration> variables)
: FunctionNode(name, move(body), move(parameters), function_length, move(variables))
{
}
@ -208,8 +211,8 @@ class FunctionExpression final : public Expression
public:
static bool must_have_name() { return false; }
FunctionExpression(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
: FunctionNode(name, move(body), move(parameters), move(variables))
FunctionExpression(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, i32 function_length, NonnullRefPtrVector<VariableDeclaration> variables)
: FunctionNode(name, move(body), move(parameters), function_length, move(variables))
{
}