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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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5
Libraries/LibJS/Parser.cpp
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@ -66,6 +66,7 @@ NonnullOwnPtr<Statement> Parser::parse_statement()
return parse_return_statement();
case TokenType::Var:
case TokenType::Let:
case TokenType::Const:
return parse_variable_declaration();
case TokenType::For:
return parse_for_statement();
@ -261,6 +262,10 @@ NonnullOwnPtr<VariableDeclaration> Parser::parse_variable_declaration()
declaration_type = DeclarationType::Let;
consume(TokenType::Let);
break;
case TokenType::Const:
declaration_type = DeclarationType::Const;
consume(TokenType::Const);
break;
default:
ASSERT_NOT_REACHED();
}