History provider: style cleanup

BUG=none
TEST=it compiles

Review URL: http://codereview.chromium.org/3177020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@56939 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 80 insertions, 0 deletions

diff --git a/chrome/browser/autocomplete/history_provider_util.h b/chrome/browser/autocomplete/history_provider_util.h
new file mode 100644
index 0000000..5f72983
--- /dev/null
+++ b/chrome/browser/autocomplete/history_provider_util.h
@@ -0,0 +1,80 @@
+// Copyright (c) 2010 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.
+
+#ifndef CHROME_BROWSER_AUTOCOMPLETE_HISTORY_PROVIDER_UTIL_H_
+#define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_PROVIDER_UTIL_H_
+#pragma once
+
+#include <deque>
+#include <vector>
+
+#include "chrome/browser/history/history_types.h"
+
+namespace history {
+
+// Constants which specify, when considered altogether, 'significant'
+// history items. These are used to filter out insignificant items
+// for consideration as autocomplete candidates.
+extern const int kLowQualityMatchTypedLimit;
+extern const int kLowQualityMatchVisitLimit;
+extern const int kLowQualityMatchAgeLimitInDays;
+
+// Used for intermediate history result operations.
+struct HistoryMatch {
+  // Required for STL, we don't use this directly.
+  HistoryMatch();
+
+  HistoryMatch(const URLRow& url_info,
+               size_t input_location,
+               bool match_in_scheme,
+               bool innermost_match);
+
+  bool operator==(const GURL& url) const;
+
+  URLRow url_info;
+
+  // The offset of the user's input within the URL.
+  size_t input_location;
+
+  // Whether this is a match in the scheme.  This determines whether we'll go
+  // ahead and show a scheme on the URL even if the user didn't type one.
+  // If our best match was in the scheme, not showing the scheme is both
+  // confusing and, for inline autocomplete of the fill_into_edit, dangerous.
+  // (If the user types "h" and we match "http://foo/", we need to inline
+  // autocomplete that, not "foo/", which won't show anything at all, and
+  // will mislead the user into thinking the What You Typed match is what's
+  // selected.)
+  bool match_in_scheme;
+
+  // A match after any scheme/"www.", if the user input could match at both
+  // locations.  If the user types "w", an innermost match ("website.com") is
+  // better than a non-innermost match ("www.google.com").  If the user types
+  // "x", no scheme in our prefix list (or "www.") begins with x, so all
+  // matches are, vacuously, "innermost matches".
+  bool innermost_match;
+};
+typedef std::deque<HistoryMatch> HistoryMatches;
+
+struct Prefix {
+  Prefix(const std::wstring& prefix, int num_components)
+      : prefix(prefix),
+        num_components(num_components) {}
+
+  std::wstring prefix;
+
+  // The number of "components" in the prefix.  The scheme is a component,
+  // and the initial "www." or "ftp." is a component.  So "http://foo.com"
+  // and "www.bar.com" each have one component, "ftp://ftp.ftp.com" has two,
+  // and "mysite.com" has none.  This is used to tell whether the user's
+  // input is an innermost match or not.  See comments in HistoryMatch.
+  int num_components;
+};
+typedef std::vector<Prefix> Prefixes;
+
+// Returns the date threshold for considering an history item as significant.
+base::Time AutocompleteAgeThreshold();
+
+}
+
+#endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_PROVIDER_UTIL_H_