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Within the loop, each word is extracted in turn using the preg_match() function with a three-part regular expression: 1 [^\w]* This looks for zero or more non-word characters, followed by 2 ([\w]+) one or more word characters (a-z, A-z, or 0-9), followed by 3 [^\w]+ one or more non-word characters In part 2, above, the regular expression segment is surrounded by brackets, which means that particular value will be saved in the array element $matches[1][0], and its length in $matches[1][1] The whole matched string, comprising all three parts, is saved in the array element $matches[0][1], and the length of this value is saved in $matches[0][1] Provided with these values, the string variable $word is assigned just the part 2 match, which is the word to be spell checked Then $offset, the pointer to the next word to be checked, is incremented by the length of the full matched string, so as to jump over any non-word characters The code is then ready to process the following word the next time round the loop In the meantime, the newly extracted word is passed to the function PIPHP_ SpellCheckWord(), along with the dictionary array to use, in $dictionary The return value from this function is either TRUE if the word is found or FALSE if it isn t Depending on the value returned, the word is added to $newtext either with or without highlighting tags Once execution exits from the loop, the text has been fully checked and so $newtext is returned, after passing it through the rtrim() function to remove the final space that was added at the function start The function PIPHP_SpellCheckLoadDictionary() is next It simply loads in the specified text file, explodes it into an array by splitting it at all the \r\n pairs, and then returns the new array Finally, there s the function PIPHP_SpellCheckWord() This takes the arguments $word and $dictionary and then returns either TRUE or FALSE depending on whether or not the word is in the dictionary This is done by means of a binary search in which the $dictionary array is continually bisected until a word is found, or is found to be missing In a dictionary of 80,000 words or so, it will take no more than about 17 iterations maximum to drill down to where a word is (or should be), which is an order of magnitude faster than checking every word in the dictionary By the way, this search relies on having a fully sorted list of words, so if you use your own word list, make sure you sort it alphabetically first The way the plug-in performs the binary search is to say Is the word I m looking for in the top half or bottom half of this section of words Then, the loop goes around again splitting whichever half it determines the word to be in, asking the same question This continues until the word is either found or determined not to be in the dictionary The variables that control this divide-and-conquer method are $bot and $top, which represent the start and end positions to search between within the $dictionary array Initially they are set to the first and last elements Then, $bot is moved up or $top is moved down by taking the midway point between the two values and assigning that to a pivotal numeric variable called $p, right in the middle If the word is greater than the one at position $p, then $bot is moved up past that word If the word is lower than the one at position $p, then $top is dropped below that position.

case WIDGETS: queryBuilder.setTables(WidgetProvider.DB_TABLE); queryBuilder.setProjectionMap(WidgetProvider.PROJECTION_MAP); break; case WIDGET: queryBuilder.setTables(WidgetProvider.DB_TABLE); queryBuilder.appendWhere("_id=" + uri.getPathSegments().get(1)); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } if (TextUtils.isEmpty(sortOrder)) { orderBy = Widget.DEFAULT_SORT_ORDER; } else { orderBy = sortOrder; } Cursor c = queryBuilder.query(db, projection, selection, selectionArgs, null, null, Perform query to get Cursor orderBy); c.setNotificationUri( getContext().getContentResolver(), uri); Set notification return c; Uri on Cursor

LISTING 9-1 ' ============================== LCDparallelbas =============================== ' Program runs on a PICAXE-20X2; sends serial data to an HD44780 16x2 LCD

} @Override public Uri insert(Uri uri, ContentValues initialValues) { long rowId = 0L; ContentValues values = null; Use ContentValues if (initialValues != null) { in insert method values = new ContentValues(initialValues); } else { values = new ContentValues(); } if (WidgetProvider.URI_MATCHER.match(uri) != WidgetProvider.WIDGETS) { throw new IllegalArgumentException("Unknown URI " + uri); } Long now = System.currentTimeMillis(); . . . omit defaulting of values for brevity Call rowId = db.insert(WidgetProvider.DB_TABLE, "widget_hack", database insert values); if (rowId > 0) { Uri result = ContentUris.withAppendedId(Widget.CONTENT_URI, rowId); getContext().getContentResolver(). Get Uri to return notifyChange(result, null); Notify listeners return result; data was inserted } throw new SQLException("Failed to insert row into " + uri); } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { Provide int count = 0; update switch (WidgetProvider.URI_MATCHER.match(uri)) { method

10:

' ' ' '

case WIDGETS: count = db.update(WidgetProvider.DB_TABLE, values, selection, selectionArgs); break; case WIDGET: String segment = uri.getPathSegments().get(1); String where = ""; if (!TextUtils.isEmpty(selection)) { where = " AND (" + selection + ")"; } count = db.update(WidgetProvider.DB_TABLE, values, "_id=" + segment + where, selectionArgs); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } @Override public int delete( Uri uri, String selection, String[] selectionArgs) { int count; switch (WidgetProvider.URI_MATCHER.match(uri)) { case WIDGETS: count = db.delete(WidgetProvider.DB_TABLE, selection, selectionArgs); break; case WIDGET: String segment = uri.getPathSegments().get(1); String where = ""; if (!TextUtils.isEmpty(selection)) { where = " AND (" + selection + ")"; } count = db.delete(WidgetProvider.DB_TABLE, "_id=" + segment + where, selectionArgs); break; default: throw new IllegalArgumentException("Unknown URI " + uri); } getContext().getContentResolver().notifyChange(uri, null); return count; } }

On failure it returns a single-element array with the value FALSE It requires these arguments: $search A search string $start The first result to return $count The maximum number of results to return

The last part of our WidgetProvider class shows how to implement the ContentProvider methods. First, we use a SQLQueryBuilder inside the query method to append the projection map passed in B and any SQL clauses, along with the correct URI based on our matcher C, before we make the actual query and get a handle on a Cursor to return D. At the end of the query method, we use the setNotificationUri method to watch the returned Uri for changes E. This event-based mechanism keeps track of when Cursor data items change, regardless of who changes them.

$id $url $xml $sxml $data $result $t $a $d $c String containing a Yahoo! Search API key String containing the API URL with $id and $search appended String containing the contents of $url SimpleXML object created from $xml Array containing the results returned SimpleXML object extracted from $sxml->resultset_web->result String containing the current title String containing the current abstract String containing the current display URL String containing the current click-through URL

' === Table ===================== Table 0, ("The Evil Genius ") Table 16, ("PICAXE-20X2 LCD ")