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// 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 "components/omnibox/browser/builtin_provider.h"
#include <stddef.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/browser/autocomplete_input.h"
#include "components/omnibox/browser/autocomplete_provider_client.h"
#include "components/omnibox/browser/history_provider.h"
#include "components/url_formatter/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::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;
const base::string16 text = input.text();
bool starting_about = base::StartsWith(embedderAbout, text,
base::CompareCase::INSENSITIVE_ASCII);
if (starting_about ||
base::StartsWith(kAbout, text, base::CompareCase::INSENSITIVE_ASCII)) {
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_formatter::FixupURL(base::UTF16ToUTF8(text), std::string());
const bool text_ends_with_slash =
base::EndsWith(text, base::ASCIIToUTF16("/"),
base::CompareCase::SENSITIVE);
// 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),
base::CompareCase::INSENSITIVE_ASCII) &&
base::StartsWith(blank_host, host,
base::CompareCase::INSENSITIVE_ASCII) &&
(url.path().length() <= 1) && !text_ends_with_slash) {
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,
base::CompareCase::INSENSITIVE_ASCII)) {
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));
// FixupURL() may have dropped a trailing slash on the user's input.
// Ensure that in that case, we don't inline autocomplete unless the
// autocompletion restores the slash. This prevents us from e.g.
// trying to add a 'y' to an input like "chrome://histor/".
base::string16 inline_autocompletion(
match_string.substr(match_length));
if (text_ends_with_slash && !base::StartsWith(
match_string.substr(match_length), base::ASCIIToUTF16("/"),
base::CompareCase::INSENSITIVE_ASCII))
inline_autocompletion = base::string16();
AddMatch(match_string, inline_autocompletion, 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) && !matches_[0].inline_autocompletion.empty()) {
// 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);
}
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