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LibJS: Add function default arguments

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Adds the ability for function arguments to have default values. This
works for standard functions as well as arrow functions. Default values
are not printed in a <function>.toString() call, as nodes cannot print
their source string representation.
This commit is contained in:
Matthew Olsson 2020-05-02 11:46:39 -07:00 • committed by Andreas Kling
parent 751f813f6a
commit 5e66f1900b
8 changed files with 184 additions and 35 deletions
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15
Libraries/LibJS/AST.h
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@ -149,12 +149,17 @@ class Declaration : public Statement {
class FunctionNode {
public:
struct Parameter {
FlyString name;
RefPtr<Expression> default_value;
};
const FlyString& name() const { return m_name; }
const Statement& body() const { return *m_body; }
const Vector<FlyString>& parameters() const { return m_parameters; };
const Vector<Parameter>& parameters() const { return m_parameters; };
protected:
FunctionNode(const FlyString& name, NonnullRefPtr<Statement> body, Vector<FlyString> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
FunctionNode(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
: m_name(name)
, m_body(move(body))
, m_parameters(move(parameters))
@ -169,7 +174,7 @@ protected:
private:
FlyString m_name;
NonnullRefPtr<Statement> m_body;
const Vector<FlyString> m_parameters;
const Vector<Parameter> m_parameters;
NonnullRefPtrVector<VariableDeclaration> m_variables;
};
@ -179,7 +184,7 @@ class FunctionDeclaration final
public:
static bool must_have_name() { return true; }
FunctionDeclaration(const FlyString& name, NonnullRefPtr<Statement> body, Vector<FlyString> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
FunctionDeclaration(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
: FunctionNode(name, move(body), move(parameters), move(variables))
{
}
@ -196,7 +201,7 @@ class FunctionExpression final : public Expression
public:
static bool must_have_name() { return false; }
FunctionExpression(const FlyString& name, NonnullRefPtr<Statement> body, Vector<FlyString> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
FunctionExpression(const FlyString& name, NonnullRefPtr<Statement> body, Vector<Parameter> parameters, NonnullRefPtrVector<VariableDeclaration> variables)
: FunctionNode(name, move(body), move(parameters), move(variables))
{
}