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LibJS: Convert GlobalObject's Encode and Decode AOs to ThrowCompletionOr

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This commit is contained in:
Timothy Flynn 2021-10-29 17:02:06 -04:00 • committed by Idan Horowitz
parent 2a967fd107
commit 875b563664
1 changed files with 24 additions and 34 deletions
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58
Userland/Libraries/LibJS/Runtime/GlobalObject.cpp
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@ -429,7 +429,7 @@ JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::eval)
}
// 19.2.6.1.1 Encode ( string, unescapedSet ), https://tc39.es/ecma262/#sec-encode
static String encode([[maybe_unused]] JS::GlobalObject& global_object, const String& string, StringView unescaped_set)
static ThrowCompletionOr<String> encode([[maybe_unused]] JS::GlobalObject& global_object, const String& string, StringView unescaped_set)
{
StringBuilder encoded_builder;
for (unsigned char code_unit : string) {
@ -444,34 +444,31 @@ static String encode([[maybe_unused]] JS::GlobalObject& global_object, const Str
}
// 19.2.6.1.2 Decode ( string, reservedSet ), https://tc39.es/ecma262/#sec-decode
static String decode(JS::GlobalObject& global_object, const String& string, StringView reserved_set)
static ThrowCompletionOr<String> decode(JS::GlobalObject& global_object, const String& string, StringView reserved_set)
{
StringBuilder decoded_builder;
auto expected_continuation_bytes = 0;
for (size_t k = 0; k < string.length(); k++) {
auto code_unit = string[k];
if (code_unit != '%') {
if (expected_continuation_bytes > 0) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
if (expected_continuation_bytes > 0)
return global_object.vm().throw_completion<URIError>(global_object, ErrorType::URIMalformed);
decoded_builder.append(code_unit);
continue;
}
if (k + 2 >= string.length()) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
if (k + 2 >= string.length())
return global_object.vm().throw_completion<URIError>(global_object, ErrorType::URIMalformed);
auto first_digit = decode_hex_digit(string[k + 1]);
if (first_digit >= 16) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
if (first_digit >= 16)
return global_object.vm().throw_completion<URIError>(global_object, ErrorType::URIMalformed);
auto second_digit = decode_hex_digit(string[k + 2]);
if (second_digit >= 16) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
if (second_digit >= 16)
return global_object.vm().throw_completion<URIError>(global_object, ErrorType::URIMalformed);
char decoded_code_unit = (first_digit << 4) | second_digit;
k += 2;
if (expected_continuation_bytes > 0) {
@ -479,6 +476,7 @@ static String decode(JS::GlobalObject& global_object, const String& string, Stri
expected_continuation_bytes--;
continue;
}
if ((decoded_code_unit & 0x80) == 0) {
if (reserved_set.contains(decoded_code_unit))
decoded_builder.append(string.substring_view(k - 2, 3));
@ -486,11 +484,11 @@ static String decode(JS::GlobalObject& global_object, const String& string, Stri
decoded_builder.append(decoded_code_unit);
continue;
}
auto leading_ones = count_trailing_zeroes_32_safe(~decoded_code_unit) - 24;
if (leading_ones == 1 || leading_ones > 4) {
global_object.vm().throw_exception<URIError>(global_object, ErrorType::URIMalformed);
return {};
}
if (leading_ones == 1 || leading_ones > 4)
return global_object.vm().throw_completion<URIError>(global_object, ErrorType::URIMalformed);
decoded_builder.append(decoded_code_unit);
expected_continuation_bytes = leading_ones - 1;
}
@ -501,9 +499,7 @@ static String decode(JS::GlobalObject& global_object, const String& string, Stri
JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::encode_uri)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto encoded = encode(global_object, uri_string, ";/?:@&=+$,abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()#"sv);
if (vm.exception())
return {};
auto encoded = TRY_OR_DISCARD(encode(global_object, uri_string, ";/?:@&=+$,abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()#"sv));
return js_string(vm, move(encoded));
}
@ -511,9 +507,7 @@ JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::encode_uri)
JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::decode_uri)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto decoded = decode(global_object, uri_string, ";/?:@&=+$,#"sv);
if (vm.exception())
return {};
auto decoded = TRY_OR_DISCARD(decode(global_object, uri_string, ";/?:@&=+$,#"sv));
return js_string(vm, move(decoded));
}
@ -521,9 +515,7 @@ JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::decode_uri)
JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::encode_uri_component)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto encoded = encode(global_object, uri_string, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()"sv);
if (vm.exception())
return {};
auto encoded = TRY_OR_DISCARD(encode(global_object, uri_string, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.!~*'()"sv));
return js_string(vm, move(encoded));
}
@ -531,9 +523,7 @@ JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::encode_uri_component)
JS_DEFINE_OLD_NATIVE_FUNCTION(GlobalObject::decode_uri_component)
{
auto uri_string = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
auto decoded = decode(global_object, uri_string, ""sv);
if (vm.exception())
return {};
auto decoded = TRY_OR_DISCARD(decode(global_object, uri_string, ""sv));
return js_string(vm, move(decoded));
}