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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_INTL_SUPPORT
#error Internationalization is expected to be enabled.
#endif // V8_INTL_SUPPORT
#include "src/builtins/builtins-utils.h"
#include "src/builtins/builtins.h"
#include "src/intl.h"
#include "src/objects-inl.h"
#include "unicode/normalizer2.h"
namespace v8 {
namespace internal {
BUILTIN(StringPrototypeToUpperCaseIntl) {
HandleScope scope(isolate);
TO_THIS_STRING(string, "String.prototype.toUpperCase");
string = String::Flatten(string);
return ConvertCase(string, true, isolate);
}
BUILTIN(StringPrototypeNormalizeIntl) {
HandleScope handle_scope(isolate);
TO_THIS_STRING(string, "String.prototype.normalize");
Handle<Object> form_input = args.atOrUndefined(isolate, 1);
const char* form_name;
UNormalization2Mode form_mode;
if (form_input->IsUndefined(isolate)) {
// default is FNC
form_name = "nfc";
form_mode = UNORM2_COMPOSE;
} else {
Handle<String> form;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, form,
Object::ToString(isolate, form_input));
if (String::Equals(form, isolate->factory()->NFC_string())) {
form_name = "nfc";
form_mode = UNORM2_COMPOSE;
} else if (String::Equals(form, isolate->factory()->NFD_string())) {
form_name = "nfc";
form_mode = UNORM2_DECOMPOSE;
} else if (String::Equals(form, isolate->factory()->NFKC_string())) {
form_name = "nfkc";
form_mode = UNORM2_COMPOSE;
} else if (String::Equals(form, isolate->factory()->NFKD_string())) {
form_name = "nfkc";
form_mode = UNORM2_DECOMPOSE;
} else {
Handle<String> valid_forms =
isolate->factory()->NewStringFromStaticChars("NFC, NFD, NFKC, NFKD");
THROW_NEW_ERROR_RETURN_FAILURE(
isolate,
NewRangeError(MessageTemplate::kNormalizationForm, valid_forms));
}
}
int length = string->length();
string = String::Flatten(string);
icu::UnicodeString result;
std::unique_ptr<uc16[]> sap;
UErrorCode status = U_ZERO_ERROR;
{
DisallowHeapAllocation no_gc;
String::FlatContent flat = string->GetFlatContent();
const UChar* src = GetUCharBufferFromFlat(flat, &sap, length);
icu::UnicodeString input(false, src, length);
// Getting a singleton. Should not free it.
const icu::Normalizer2* normalizer =
icu::Normalizer2::getInstance(nullptr, form_name, form_mode, status);
DCHECK(U_SUCCESS(status));
CHECK(normalizer != nullptr);
int32_t normalized_prefix_length =
normalizer->spanQuickCheckYes(input, status);
// Quick return if the input is already normalized.
if (length == normalized_prefix_length) return *string;
icu::UnicodeString unnormalized =
input.tempSubString(normalized_prefix_length);
// Read-only alias of the normalized prefix.
result.setTo(false, input.getBuffer(), normalized_prefix_length);
// copy-on-write; normalize the suffix and append to |result|.
normalizer->normalizeSecondAndAppend(result, unnormalized, status);
}
if (U_FAILURE(status)) {
return isolate->heap()->undefined_value();
}
RETURN_RESULT_OR_FAILURE(
isolate, isolate->factory()->NewStringFromTwoByte(Vector<const uint16_t>(
reinterpret_cast<const uint16_t*>(result.getBuffer()),
result.length())));
}
} // namespace internal
} // namespace v8
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