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LibJS: Implement const variable declarations

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This also tightens the means of redeclaration of a variable by proxy,
since we now have a way of knowing how a variable was initially
declared, we can check if it was declared using `let` or `const` and
not tolerate redeclaration like we did previously.
This commit is contained in:
0xtechnobabble 2020-03-12 14:24:34 +02:00 • committed by Andreas Kling
parent 8557bc56f7
commit ee5a49e2fe
5 changed files with 46 additions and 13 deletions
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12
Libraries/LibJS/AST.cpp
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@ -456,6 +456,7 @@ Value UpdateExpression::execute(Interpreter& interpreter) const
break;
case UpdateOp::Decrement:
interpreter.set_variable(name, Value(previous_value.as_double() - 1));
break;
}
return previous_value;
@ -520,19 +521,22 @@ Value VariableDeclaration::execute(Interpreter& interpreter) const
void VariableDeclaration::dump(int indent) const
{
const char* op_string = nullptr;
const char* declaration_type_string = nullptr;
switch (m_declaration_type) {
case DeclarationType::Let:
op_string = "Let";
declaration_type_string = "Let";
break;
case DeclarationType::Var:
op_string = "Var";
declaration_type_string = "Var";
break;
case DeclarationType::Const:
declaration_type_string = "Const";
break;
}
ASTNode::dump(indent);
print_indent(indent + 1);
printf("%s\n", op_string);
printf("%s\n", declaration_type_string);
m_name->dump(indent + 1);
if (m_initializer)
m_initializer->dump(indent + 1);