Revert of Embed address normalization rewriting rules.

components/autofill/core/browser/address_rewriter.cc

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "components/autofill/core/browser/address_rewriter.h"
-
-#include <memory>
-#include <unordered_map>
-
-#include "base/i18n/case_conversion.h"
-#include "base/memory/singleton.h"
-#include "base/strings/utf_string_conversions.h"
-#include "third_party/re2/src/re2/re2.h"
-
-namespace autofill {
-namespace {
-
-// Import in the internal rule table symbols. The data is defined in
-// components/autofill/core/browser/address_rewriter_rules.cc
-using internal::Rule;
-using internal::RegionInfo;
-using internal::kRuleTable;
-using internal::kRuleTableSize;
-
-// Aliases for the types used by the compiled rules cache.
-using CompiledRule = std::pair<std::unique_ptr<re2::RE2>, re2::StringPiece>;
-using CompiledRuleVector = std::vector<CompiledRule>;
-using CompiledRuleCache = std::unordered_map<std::string, CompiledRuleVector>;
-
-// Helper function to find the rules associated with |region|. Note that this
-// requires that kRuleTable be sorted by region.
-static const RegionInfo* GetRegionInfo(const base::StringPiece& region) {
-  const RegionInfo* begin = kRuleTable;
-  const RegionInfo* end = kRuleTable + kRuleTableSize;
-  const RegionInfo* iter = std::lower_bound(begin, end, region);
-  if (iter != end && region == iter->region)
-    return iter;
-  return nullptr;
-}
-
-// The cache of compiled string replacement rules, keyed by region. This class
-// is a singleton that compiles the rules for a given region the first time
-// they are requested.
-class Cache {
- public:
-  // Return the singleton instance of the cache.
-  static Cache* GetInstance() { return base::Singleton<Cache>::get(); }
-
-  // If the rules for |region| have already been compiled and cached, return a
-  // pointer to them. Otherwise, find the rules for |region| (returning nullptr
-  // if there are no such rules exist), compile them, cache them, and return a
-  // pointer to the cached rules.
-  const CompiledRuleVector* GetRulesForRegion(const std::string& region) {
-    // Take the lock so that we don't update the data cache concurrently. Note
-    // that the returned data is const and can be concurrently accessed, just
-    // not the data cache.
-    base::AutoLock auto_lock(lock_);
-
-    // If we find a cached set of rules, return a pointer to the data.
-    CompiledRuleCache::iterator cache_iter = data_.find(region);
-    if (cache_iter != data_.end())
-      return &cache_iter->second;
-
-    // Cache miss. Look for the raw rules. If none, then return nullptr.
-    const RegionInfo* region_info = GetRegionInfo(region);
-    if (region_info == nullptr)
-      return nullptr;
-
-    // Add a new rule vector the the cache and populate it with compiled rules.
-    re2::RE2::Options options;
-    options.set_utf8(true);
-    options.set_word_boundary(true);
-    CompiledRuleVector& compiled_rules = data_[region];
-    compiled_rules.reserve(region_info->num_rules);
-    for (size_t i = 0; i < region_info->num_rules; ++i) {
-      const Rule& rule = region_info->rules[i];
-      std::unique_ptr<re2::RE2> pattern(new re2::RE2(rule.pattern, options));
-      re2::StringPiece rewrite(rule.rewrite);
-      compiled_rules.emplace_back(std::move(pattern), std::move(rewrite));
-    }
-
-    // Return a pointer to the data.
-    return &compiled_rules;
-  }
-
- private:
-  Cache() {}
-
-  // Synchronizes access to |data_|, ensuring that a given set of rules is
-  // only compiled once.
-  base::Lock lock_;
-
-  // The cache of compiled rules, keyed by region.
-  CompiledRuleCache data_;
-
-  friend struct base::DefaultSingletonTraits<Cache>;
-  DISALLOW_COPY_AND_ASSIGN(Cache);
-};
-
-}  // namespace
-
-AddressRewriter AddressRewriter::ForCountryCode(
-    const base::string16& country_code) {
-  const std::string region =
-      base::UTF16ToUTF8(base::i18n::ToUpper(country_code));
-  const CompiledRuleVector* rules =
-      Cache::GetInstance()->GetRulesForRegion(region);
-  AddressRewriter rewriter;
-  rewriter.impl_ = rules;
-  return rewriter;
-}
-
-base::string16 AddressRewriter::Rewrite(const base::string16& text) const {
-  if (impl_ == nullptr)
-    return base::CollapseWhitespace(text, true);
-
-  // Apply all of the string replacement rules. We don't have to worry about
-  // whitespace during these passes because the patterns are all whitespace
-  // tolerant regular expressions.
-  std::string utf8_text = base::UTF16ToUTF8(text);
-  for (const auto& rule : *static_cast<const CompiledRuleVector*>(impl_)) {
-    RE2::GlobalReplace(&utf8_text, *rule.first, rule.second);
-  }
-
-  // Collapse whitespace before returning the final value.
-  return base::UTF8ToUTF16(base::CollapseWhitespaceASCII(utf8_text, true));
-}
-
-}  // namespace autofill