[Favicon] Adding FallbackIconUrlParser.

chrome/common/favicon/fallback_icon_url_parser.h

+// Copyright 2015 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_COMMON_FAVICON_FALLBACK_ICON_URL_PARSER_H_
+#define CHROME_COMMON_FAVICON_FALLBACK_ICON_URL_PARSER_H_
+
+#include <string>
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "components/favicon_base/fallback_icon_style.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "url/gurl.h"
+
+namespace chrome {
+
+class ParsedFallbackIconPath {
+ public:
+  ParsedFallbackIconPath();
+  ~ParsedFallbackIconPath();
+
+  const GURL& url() const { return url_; }
+
+  int size_in_pixels() const { return size_in_pixels_; }
+
+  const favicon_base::FallbackIconStyle& style() const { return style_; }
+
+  // Parses |path|, which should be in the format described at the top of the
+  // file "chrome/browser/ui/webui/fallback_icon_source.h".
+  bool Parse(const std::string& path);
+
+ private:
+  // Parses |specs_str|, which should be the comma-separated value portion
+  // in the format described at the top of the file
+  // "chrome/browser/ui/webui/fallback_icon_source.h".
+  static bool ParseSpecs(const std::string& specs_str,
+                         int *size,
+                         favicon_base::FallbackIconStyle* style);
+
+  // Helper to parse color string (e.g., "red", "#f00", "#fF0000"). Returns true
+  // on success.
+  static bool ParseColor(const std::string& color_str, SkColor* color);
+
+  friend class FallbackIconUrlParserTest;
+  FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseColorSuccess);
+  FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseColorFailure);
+  FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsEmpty);
+  FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsPartial);
+  FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsFull);
+  FRIEND_TEST_ALL_PREFIXES(FallbackIconUrlParserTest, ParseSpecsFailure);
+
+  // The page URL the fallback icon is requested for.
+  GURL url_;
+
+  // The size of the requested fallback icon in pixels.
+  int size_in_pixels_;
+
+  // Styling specifications of fallback icon.
+  favicon_base::FallbackIconStyle style_;
+
+  DISALLOW_COPY_AND_ASSIGN(ParsedFallbackIconPath);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_COMMON_FAVICON_FALLBACK_ICON_URL_PARSER_H_