Componentize AutocompleteController and its supporting cast

chrome/browser/autocomplete/builtin_provider.cc

-// Copyright (c) 2012 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 "chrome/browser/autocomplete/builtin_provider.h"
-
-#include <algorithm>
-
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "components/metrics/proto/omnibox_input_type.pb.h"
-#include "components/omnibox/autocomplete_input.h"
-#include "components/omnibox/autocomplete_provider_client.h"
-#include "components/omnibox/history_provider.h"
-#include "components/url_fixer/url_fixer.h"
-
-const int BuiltinProvider::kRelevance = 860;
-
-BuiltinProvider::BuiltinProvider(AutocompleteProviderClient* client)
-    : AutocompleteProvider(AutocompleteProvider::TYPE_BUILTIN),
-      client_(client) {
-  builtins_ = client_->GetBuiltinURLs();
-}
-
-void BuiltinProvider::Start(const AutocompleteInput& input,
-                            bool minimal_changes) {
-  matches_.clear();
-  if (input.from_omnibox_focus() ||
-      (input.type() == metrics::OmniboxInputType::INVALID) ||
-      (input.type() == metrics::OmniboxInputType::FORCED_QUERY) ||
-      (input.type() == metrics::OmniboxInputType::QUERY))
-    return;
-
-  const size_t kAboutSchemeLength = strlen(url::kAboutScheme);
-  const base::string16 kAbout =
-      base::ASCIIToUTF16(url::kAboutScheme) +
-      base::ASCIIToUTF16(url::kStandardSchemeSeparator);
-  const base::string16 embedderAbout =
-      base::UTF8ToUTF16(client_->GetEmbedderRepresentationOfAboutScheme()) +
-      base::ASCIIToUTF16(url::kStandardSchemeSeparator);
-
-  const int kUrl = ACMatchClassification::URL;
-  const int kMatch = kUrl | ACMatchClassification::MATCH;
-
-  base::string16 text = input.text();
-  bool starting_about = base::StartsWith(embedderAbout, text, false);
-  if (starting_about || base::StartsWith(kAbout, text, false)) {
-    ACMatchClassifications styles;
-    // Highlight the input portion matching |embedderAbout|; or if the user has
-    // input "about:" (with optional slashes), highlight the whole
-    // |embedderAbout|.
-    bool highlight = starting_about || text.length() > kAboutSchemeLength;
-    styles.push_back(ACMatchClassification(0, highlight ? kMatch : kUrl));
-    size_t offset = starting_about ? text.length() : embedderAbout.length();
-    if (highlight)
-      styles.push_back(ACMatchClassification(offset, kUrl));
-    // Include some common builtin URLs as the user types the scheme.
-    for (base::string16 url : client_->GetBuiltinsToProvideAsUserTypes())
-      AddMatch(url, base::string16(), styles);
-  } else {
-    // Match input about: or |embedderAbout| URL input against builtin URLs.
-    GURL url = url_fixer::FixupURL(base::UTF16ToUTF8(text), std::string());
-    // BuiltinProvider doesn't know how to suggest valid ?query or #fragment
-    // extensions to builtin URLs.
-    if (url.SchemeIs(
-            client_->GetEmbedderRepresentationOfAboutScheme().c_str()) &&
-        url.has_host() && !url.has_query() && !url.has_ref()) {
-      // Suggest about:blank for substrings, taking URL fixup into account.
-      // Chrome does not support trailing slashes or paths for about:blank.
-      const base::string16 blank_host = base::ASCIIToUTF16("blank");
-      const base::string16 host = base::UTF8ToUTF16(url.host());
-      if (base::StartsWith(text, base::ASCIIToUTF16(url::kAboutScheme),
-                           false) &&
-          base::StartsWith(blank_host, host, false) &&
-          (url.path().length() <= 1) &&
-          !base::EndsWith(text, base::ASCIIToUTF16("/"), false)) {
-        ACMatchClassifications styles;
-        styles.push_back(ACMatchClassification(0, kMatch));
-        base::string16 match = base::ASCIIToUTF16(url::kAboutBlankURL);
-        // Measure the length of the matching host after the "about:" scheme.
-        const size_t corrected_length = kAboutSchemeLength + 1 + host.length();
-        if (blank_host.length() > host.length())
-          styles.push_back(ACMatchClassification(corrected_length, kUrl));
-        AddMatch(match, match.substr(corrected_length), styles);
-      }
-
-      // Include the path for sub-pages (e.g. "chrome://settings/browser").
-      base::string16 host_and_path = base::UTF8ToUTF16(url.host() + url.path());
-      base::TrimString(host_and_path, base::ASCIIToUTF16("/"), &host_and_path);
-      size_t match_length = embedderAbout.length() + host_and_path.length();
-      for (Builtins::const_iterator i(builtins_.begin());
-          (i != builtins_.end()) && (matches_.size() < kMaxMatches); ++i) {
-        if (base::StartsWith(*i, host_and_path, false)) {
-          ACMatchClassifications styles;
-          // Highlight |embedderAbout|, even for input "about:foo".
-          styles.push_back(ACMatchClassification(0, kMatch));
-          base::string16 match_string = embedderAbout + *i;
-          if (match_string.length() > match_length)
-            styles.push_back(ACMatchClassification(match_length, kUrl));
-          AddMatch(match_string, match_string.substr(match_length), styles);
-        }
-      }
-    }
-  }
-
-  for (size_t i = 0; i < matches_.size(); ++i)
-    matches_[i].relevance = kRelevance + matches_.size() - (i + 1);
-  if (!HistoryProvider::PreventInlineAutocomplete(input) &&
-      (matches_.size() == 1)) {
-    // If there's only one possible completion of the user's input and
-    // allowing completions is okay, give the match a high enough score to
-    // allow it to beat url-what-you-typed and be inlined.
-    matches_[0].relevance = 1250;
-    matches_[0].allowed_to_be_default_match = true;
-  }
-}
-
-BuiltinProvider::~BuiltinProvider() {}
-
-void BuiltinProvider::AddMatch(const base::string16& match_string,
-                               const base::string16& inline_completion,
-                               const ACMatchClassifications& styles) {
-  AutocompleteMatch match(this, kRelevance, false,
-                          AutocompleteMatchType::NAVSUGGEST);
-  match.fill_into_edit = match_string;
-  match.inline_autocompletion = inline_completion;
-  match.destination_url = GURL(match_string);
-  match.contents = match_string;
-  match.contents_class = styles;
-  matches_.push_back(match);
-}