Revert r7768

src/extensions/experimental/language-matcher.cc

Index: src/extensions/experimental/language-matcher.cc
===================================================================
--- src/extensions/experimental/language-matcher.cc	(revision 7774)
+++ src/extensions/experimental/language-matcher.cc	(working copy)
@@ -1,239 +0,0 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// TODO(cira): Remove LanguageMatcher from v8 when ICU implements
-// language matching API.
-
-#include "language-matcher.h"
-
-#include "platform.h"
-#include "unicode/datefmt.h"  // For getAvailableLocales
-#include "unicode/locid.h"
-#include "unicode/uloc.h"
-#include "utils.h"
-
-namespace v8 {
-namespace internal {
-
-const unsigned int LanguageMatcher::kLanguageWeight = 75;
-const unsigned int LanguageMatcher::kScriptWeight = 20;
-const unsigned int LanguageMatcher::kRegionWeight = 5;
-const unsigned int LanguageMatcher::kThreshold = 50;
-const unsigned int LanguageMatcher::kPositionBonus = 1;
-const char* const LanguageMatcher::kDefaultLocale = "root";
-
-static const char* GetLanguageException(const char*);
-static void BCP47ToICUFormat(v8::Handle<v8::String>, char*);
-static int CompareLocaleSubtags(const char*, const char*);
-static bool BuildLocaleName(const char*, const char*, LocaleIDMatch*);
-
-LocaleIDMatch::LocaleIDMatch()
-    : score(-1) {
-  OS::SNPrintF(Vector<char>(bcp47_id, ULOC_FULLNAME_CAPACITY),
-               "%s", LanguageMatcher::kDefaultLocale);
-  OS::SNPrintF(Vector<char>(icu_id, ULOC_FULLNAME_CAPACITY),
-               "%s", LanguageMatcher::kDefaultLocale);
-}
-
-LocaleIDMatch& LocaleIDMatch::operator=(const LocaleIDMatch& rhs) {
-  OS::SNPrintF(Vector<char>(this->bcp47_id, ULOC_FULLNAME_CAPACITY),
-               "%s", rhs.bcp47_id);
-  OS::SNPrintF(Vector<char>(this->icu_id, ULOC_FULLNAME_CAPACITY),
-               "%s", rhs.icu_id);
-  this->score = rhs.score;
-
-  return *this;
-}
-
-// static
-void LanguageMatcher::GetBestMatchForPriorityList(
-    v8::Handle<v8::Array> locales, LocaleIDMatch* result) {
-  v8::HandleScope handle_scope;
-
-  unsigned int position_bonus = locales->Length() * kPositionBonus;
-
-  int max_score = 0;
-  LocaleIDMatch match;
-  for (unsigned int i = 0; i < locales->Length(); ++i) {
-    position_bonus -= kPositionBonus;
-
-    v8::TryCatch try_catch;
-    v8::Local<v8::Value> locale_id = locales->Get(v8::Integer::New(i));
-
-    // Return default if exception is raised when reading parameter.
-    if (try_catch.HasCaught()) break;
-
-    // JavaScript arrays can be heterogenous so check each item
-    // if it's a string.
-    if (!locale_id->IsString()) continue;
-
-    if (!CompareToSupportedLocaleIDList(locale_id->ToString(), &match)) {
-      continue;
-    }
-
-    // Skip items under threshold.
-    if (match.score < kThreshold) continue;
-
-    match.score += position_bonus;
-    if (match.score > max_score) {
-      *result = match;
-
-      max_score = match.score;
-    }
-  }
-}
-
-// static
-void LanguageMatcher::GetBestMatchForString(
-    v8::Handle<v8::String> locale, LocaleIDMatch* result) {
-  LocaleIDMatch match;
-
-  if (CompareToSupportedLocaleIDList(locale, &match) &&
-      match.score >= kThreshold) {
-    *result = match;
-  }
-}
-
-// static
-bool LanguageMatcher::CompareToSupportedLocaleIDList(
-    v8::Handle<v8::String> locale_id, LocaleIDMatch* result) {
-  static int32_t available_count = 0;
-  // Depending on how ICU data is built, locales returned by
-  // Locale::getAvailableLocale() are not guaranteed to support DateFormat,
-  // Collation and other services.  We can call getAvailableLocale() of all the
-  // services we want to support and take the intersection of them all, but
-  // using DateFormat::getAvailableLocales() should suffice.
-  // TODO(cira): Maybe make this thread-safe?
-  static const icu::Locale* available_locales =
-      icu::DateFormat::getAvailableLocales(available_count);
-
-  // Skip this locale_id if it's not in ASCII.
-  static LocaleIDMatch default_match;
-  v8::String::AsciiValue is_ascii(locale_id);
-  if (*is_ascii == NULL) {
-    *result = default_match;
-    return true;
-  }
-
-  char locale[ULOC_FULLNAME_CAPACITY];
-  BCP47ToICUFormat(locale_id, locale);
-  icu::Locale input_locale(locale);
-
-  // Position of the best match locale in list of available locales.
-  int position = -1;
-  result->score = 0;
-  const char* language = GetLanguageException(input_locale.getLanguage());
-  const char* script = input_locale.getScript();
-  const char* region = input_locale.getCountry();
-  for (int32_t i = 0; i < available_count; ++i) {
-    int current_score = 0;
-    int sign =
-        CompareLocaleSubtags(language, available_locales[i].getLanguage());
-    current_score += sign * kLanguageWeight;
-
-    sign = CompareLocaleSubtags(script, available_locales[i].getScript());
-    current_score += sign * kScriptWeight;
-
-    sign = CompareLocaleSubtags(region, available_locales[i].getCountry());
-    current_score += sign * kRegionWeight;
-
-    if (current_score > result->score) {
-      result->score = current_score;
-      position = i;
-    }
-  }
-
-  if (result->score < kThreshold || position == -1) {
-    *result = default_match;
-    return true;
-  }
-
-  return BuildLocaleName(available_locales[position].getBaseName(),
-                         input_locale.getName(), result);
-}
-
-// For some unsupported language subtags it is better to fallback to related
-// language that is supported than to default.
-static const char* GetLanguageException(const char* language) {
-  // Serbo-croatian to Serbian.
-  if (!strcmp(language, "sh")) return "sr";
-
-  // Norweigan to Norweiaan to Norwegian Bokmal.
-  if (!strcmp(language, "no")) return "nb";
-
-  // Moldavian to Romanian.
-  if (!strcmp(language, "mo")) return "ro";
-
-  // Tagalog to Filipino.
-  if (!strcmp(language, "tl")) return "fil";
-
-  return language;
-}
-
-// Converts user input from BCP47 locale id format to ICU compatible format.
-static void BCP47ToICUFormat(v8::Handle<v8::String> locale_id, char* locale) {
-  UErrorCode status = U_ZERO_ERROR;
-  int32_t locale_size = 0;
-  uloc_forLanguageTag(*v8::String::Utf8Value(locale_id), locale,
-                      ULOC_FULLNAME_CAPACITY, &locale_size, &status);
-}
-
-// Compares locale id subtags.
-// Returns 1 for match or -1 for mismatch.
-static int CompareLocaleSubtags(const char* lsubtag, const char* rsubtag) {
-  return strcmp(lsubtag, rsubtag) == 0 ? 1 : -1;
-}
-
-// Builds a BCP47 compliant locale id from base name of matched locale and
-// full user specified locale.
-// Returns false if uloc_toLanguageTag failed to convert locale id.
-// Example:
-//   base_name of matched locale (ICU ID): de_DE
-//   input_locale_name (ICU ID): de_AT@collation=phonebk
-//   result (ICU ID): de_DE@collation=phonebk
-//   result (BCP47 ID): de-DE-u-co-phonebk
-static bool BuildLocaleName(const char* base_name,
-                            const char* input_locale_name,
-                            LocaleIDMatch* result) {
-  // Get extensions (if any) from the original locale.
-  const char* extension = strchr(input_locale_name, ULOC_KEYWORD_SEPARATOR);
-  if (extension != NULL) {
-    OS::SNPrintF(Vector<char>(result->icu_id, ULOC_FULLNAME_CAPACITY),
-                 "%s%s", base_name, extension);
-  } else {
-    OS::SNPrintF(Vector<char>(result->icu_id, ULOC_FULLNAME_CAPACITY),
-                 "%s", base_name);
-  }
-
-  // Convert ICU locale name into BCP47 format.
-  UErrorCode status = U_ZERO_ERROR;
-  uloc_toLanguageTag(result->icu_id, result->bcp47_id,
-                     ULOC_FULLNAME_CAPACITY, false, &status);
-  return !U_FAILURE(status);
-}
-
-} }  // namespace v8::internal