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LibJS: Allow invalid string in tagged template literals

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Since tagged template literals can inspect the raw string it is not a
syntax error to have invalid escapes. However the cooked value should be
`undefined`.
We accomplish this by tracking whether parse_string_literal
fails and then using a NullLiteral (since UndefinedLiteral is not a
thing) and finally converting null in tagged template execution to
undefined.
This commit is contained in:
davidot 2022-08-17 02:04:27 +02:00 • committed by Linus Groh
parent 0f9434a02c
commit e5adc51e27
5 changed files with 67 additions and 8 deletions
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9
Userland/Libraries/LibJS/Parser.h
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@ -142,7 +142,14 @@ public:
NonnullRefPtr<RegExpLiteral> parse_regexp_literal();
NonnullRefPtr<ObjectExpression> parse_object_expression();
NonnullRefPtr<ArrayExpression> parse_array_expression();
NonnullRefPtr<StringLiteral> parse_string_literal(Token const& token, bool in_template_literal = false);
enum class StringLiteralType {
Normal,
NonTaggedTemplate,
TaggedTemplate
};
NonnullRefPtr<StringLiteral> parse_string_literal(Token const& token, StringLiteralType string_literal_type = StringLiteralType::Normal, bool* contains_invalid_escape = nullptr);
NonnullRefPtr<TemplateLiteral> parse_template_literal(bool is_tagged);
ExpressionResult parse_secondary_expression(NonnullRefPtr<Expression>, int min_precedence, Associativity associate = Associativity::Right, ForbiddenTokens forbidden = {});
NonnullRefPtr<Expression> parse_call_expression(NonnullRefPtr<Expression>);