gecko/toolkit/components/places/src/SQLFunctions.h

/* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Places code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Shawn Wilsher <me@shawnwilsher.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef mozilla_places_SQLFunctions_h_
#define mozilla_places_SQLFunctions_h_

/**
 * This file contains functions that Places adds to the database handle that can
 * be accessed by SQL queries.
 */

#include "mozIStorageFunction.h"

class mozIStorageConnection;

namespace mozilla {
namespace places {

////////////////////////////////////////////////////////////////////////////////
//// AutoComplete Matching Function

/**
 * This function is used to determine if a given set of data should match an
 * AutoComplete query.
 *
 * In SQL, you'd use it in the WHERE clause like so:
 * WHERE AUTOCOMPLETE_MATCH(aSearchString, aURL, aTitle, aTags, aVisitCount,
 *                          aTyped)
 *
 * @param aSearchString
 *        The string to compare against.
 * @param aURL
 *        The URL to test for an AutoComplete match.
 * @param aTitle
 *        The title to test for an AutoComplete match.
 * @param aTags
 *        The tags to test for an AutoComplete match.
 * @param aVisitCount
 *        The number of visits aURL has.
 * @param aTyped
 *        Indicates if aURL is a typed URL or not.  Treated as a boolean.
 * @param aBookmark
 *        Indicates if aURL is a bookmark or not.  Treated as a boolean.
 * @param aMatchBehavior
 *        The match behavior to use for this search.
 * @param aSearchBehavior
 *        A bitfield dictating the search behavior.
 */
class MatchAutoCompleteFunction : public mozIStorageFunction
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_MOZISTORAGEFUNCTION

  /**
   * Registers the function with the specified database connection.
   *
   * @param aDBConn
   *        The database connection to register with.
   */
  static nsresult create(mozIStorageConnection *aDBConn);

private:
  /**
   * Argument Indexes
   */
  static const PRUint32 kArgSearchString = 0;
  static const PRUint32 kArgIndexURL = 1;
  static const PRUint32 kArgIndexTitle = 2;
  static const PRUint32 kArgIndexTags = 3;
  static const PRUint32 kArgIndexVisitCount = 4;
  static const PRUint32 kArgIndexTyped = 5;
  static const PRUint32 kArgIndexBookmark = 6;
  static const PRUint32 kArgIndexMatchBehavior = 7;
  static const PRUint32 kArgIndexSearchBehavior = 8;
  static const PRUint32 kArgIndexLength = 9;

  /**
   * Typedefs
   */
  typedef bool (*searchFunctionPtr)(const nsDependentSubstring &aToken,
                                    const nsAString &aSourceString);

  typedef nsAString::const_char_iterator const_wchar_iterator;

  /**
   * Obtains the search function to match on.
   *
   * @param aBehavior
   *        The matching behavior to use defined by one of the
   *        mozIPlacesAutoComplete::MATCH_* values.
   * @return a pointer to the function that will perform the proper search.
   */
  static searchFunctionPtr getSearchFunction(PRInt32 aBehavior);

  /**
   * Searches aSourceString for aToken anywhere in the string in a case-
   * insensitive way.
   *
   * @param aToken
   *        The string to search for.
   * @param aSourceString
   *        The string to search.
   * @return true if found, false otherwise.
   */
  static bool findAnywhere(const nsDependentSubstring &aToken,
                           const nsAString &aSourceString);

  /**
   * Tests if aSourceString starts with aToken.
   *
   * @param aToken
   *        The string to search for.
   * @param aSourceString
   *        The string to search.
   * @return true if found, false otherwise.
   */
  static bool findBeginning(const nsDependentSubstring &aToken,
                            const nsAString &aSourceString);

  /**
   * Tests if aToken is found on a word boundary in aSourceString.
   *
   * @param aToken
   *        The string to search for.
   * @param aSourceString
   *        The string to search.
   * @return true if found, false otherwise.
   */
  static bool findOnBoundary(const nsDependentSubstring &aToken,
                             const nsAString &aSourceString);

  /**
   * Obtains an iterator to the next word boundary as defined by isWordBoundary.
   *
   * @param aStart
   *        An iterator pointing to the start of the string.
   * @param aEnd
   *        An iterator pointing to the end of the string.
   * @return an iterator pointing to the next word boundary.
   */
  static const_wchar_iterator nextWordBoundary(const_wchar_iterator aStart,
                                               const_wchar_iterator aEnd);
  /**
   * Determines if aChar is a word boundary.  A 'word boundary' is anything that
   * is not used to build up a word from a string of characters.  We are very
   * conservative here because anything that we do not list will be treated as a
   * word boundary.  This means searching for that not-actually-a-word-boundary
   * character can still be matched in the middle of a word.
   *
   * @param aChar
   *        The Unicode character to check against.
   * @return true if the character is considered a word boundary, false
   *          otherwise.
   */
  static inline bool isWordBoundary(const PRUnichar &aChar);

  /**
   * Fixes a URI's spec such that it is ready to be searched.  This includes
   * unescaping escaped characters and removing certain specs that we do not
   * care to search for.
   *
   * @param aURISpec
   *        The spec of the URI to prepare for searching.
   * @return the new string to use for the URI spec.
   */
  static nsString fixupURISpec(const nsDependentCString &aURISpec);
};

} // namespace places
} // namespace storage

#endif // mozilla_places_SQLFunctions_h_