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LibJS: Make invalid RegExp flags a SyntaxError at parse time

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This patch changes the validation of RegExp flags (checking for
invalid and duplicate values) from a SyntaxError at runtime to a
SyntaxError at parse time - it's not something that's supposed to be
catchable.
As a nice side effect, this simplifies the RegExpObject constructor a
bit, as it can no longer throw an exception and doesn't have to validate
the flags itself.
This commit is contained in:
Linus Groh
2021-05-10 12:01:38 +01:00
parent c93c2dc72c
commit 60064e2049
Notes: sideshowbarker 2024-07-18 18:22:34 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/60064e20498
4 changed files with 22 additions and 33 deletions
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16
Userland/Libraries/LibJS/Parser.cpp
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@@ -6,6 +6,7 @@
*/
#include "Parser.h"
#include <AK/HashTable.h>
#include <AK/ScopeGuard.h>
#include <AK/StdLibExtras.h>
#include <AK/TemporaryChange.h>
@@ -686,7 +687,20 @@ NonnullRefPtr<RegExpLiteral> Parser::parse_regexp_literal()
auto pattern = consume().value();
// Remove leading and trailing slash.
pattern = pattern.substring_view(1, pattern.length() - 2);
auto flags = match(TokenType::RegexFlags) ? consume().value() : "";
auto flags = String::empty();
if (match(TokenType::RegexFlags)) {
auto flags_start = position();
flags = consume().value();
HashTable<char> seen_flags;
for (size_t i = 0; i < flags.length(); ++i) {
auto flag = flags.substring_view(i, 1);
if (!flag.is_one_of("g", "i", "m", "s", "u", "y"))
syntax_error(String::formatted("Invalid RegExp flag '{}'", flag), Position { flags_start.line, flags_start.column + i });
if (seen_flags.contains(*flag.characters_without_null_termination()))
syntax_error(String::formatted("Repeated RegExp flag '{}'", flag), Position { flags_start.line, flags_start.column + i });
seen_flags.set(*flag.characters_without_null_termination());
}
}
return create_ast_node<RegExpLiteral>({ m_parser_state.m_current_token.filename(), rule_start.position(), position() }, pattern, flags);
}