There are currently two types of fulltext searching: an SQL-based word index and a file scanner. They each have their advantages and drawbacks.
The word index is very fast to search and is currently used for the find-as-you-type quicksearch. However, indexing files takes some time, so we should probably offer a preference to turn it off ("Index attachment content for quicksearch" or something). There's also an issue with Chinese characters (which are indexed by character rather than word, since there are no spaces to go by, so a search for a word with common characters could produce erroneous results). The quicksearch doesn't use a left-bound index (since that would probably upset German speakers searching for "musik" in "nachtmusik," though I don't know for sure how they think of words) but still seems pretty fast.
* Note: There will be a potentially long delay when you start Firefox with this revision as it builds a fulltext word index of your existing items. We obviously need a notification/option for this. *
The file scanner, used in the Attachment Content condition of the search dialog, offers phrase searching as well as regex support (both case-sensitive and not, and defaulting to multiline). It doesn't require an index, though it should probably be optimized to use the word index, if available, for narrowing the results when not in regex mode. (It does only scan files that pass all the other search conditions, which speeds it up considerably for multi-condition searches, and skips non-text files unless instructed otherwise, but it's still relatively slow.)
Both convert HTML to text before searching (with the exception of the binary file scanning mode).
There are some issues with which files get indexed and which don't that we can't do much about and that will probably confuse users immensely. Dan C. suggested some sort of indicator (say, a green dot) to show which files are indexed.
Also added (very ugly) charset detection (anybody want to figure out getCharsetFromString(str)?), a setTimeout() replacement in the XPCOM service, an arrayToHash() method, and a new header to timedtextarea.xml, since it's really not copyright CHNM (it's really just a few lines off from the toolkit timed-textbox binding--I tried to change it to extend timed-textbox and just ignore Return keypress events so that we didn't need to duplicate the Mozilla code, but timed-textbox's reliance on html:input instead of html:textarea made things rather difficult).
To do:
- Pref/buttons to disable/clear/rebuild fulltext index
- Hidden prefs to set maximum file size to index/scan
- Don't index words of fewer than 3 non-Asian characters
- MRU cache for saved searches
- Use word index if available to narrow search scope of fulltext scanner
- Cache attachment info methods
- Show content excerpt in search results (at least in advanced search window, when it exists)
- Notification window (a la scraping) to show when indexing
- Indicator of indexed status
- Context menu option to index
- Indicator that a file scanning search is in progress, if possible
- Find other ways to make it index the NYT front page in under 10 seconds
- Probably fix lots of bugs, which you will likely start telling me about...now.
- select() new collections and saved searches on creation
- Show all collections in search dialog Collection condition drop-down, not just top-level ones -- eventually there should probably be some sort of level indication to show hierarchy
- Don't allow a search to define itself as a savedSearchID condition. Right.
- Fixed a couple bugs in Collection condition creation that would've made such searches often not work
- Added saved search 'add' support to collectionTreeView notify(), and send the right trigger from Scholar.Search
Implemented isBefore and isAfter operators and added to date conditions -- currently have to type dates in SQL format, but we'll have a chooser or something by Beta 2 (this should probably be a known issue)
Added isLessThan and isGreaterThan to 'pages', 'section', 'accessionNumber', 'seriesNumber', and 'issue' fields, though somebody should probably check me on that list
Removed JS strict warning on empty search results
Conditions can now offer drop-down menus rather than freeform text fields -- implemented for collections/saved searches and item types
Special handling to combine collections and saved searches into a single "Collection" menu (can we get away with calling them "Smart Collections"?) -- internally, values are stored as C1234 or S5678 in the interface and converted to/from regular collectionID and savedSearchID conditions for search.js
Use localized strings for conditions (tries searchConditions.* first, then itemFields.*)
Alphabetize condition list
Operator menu now fixed length for all conditions
Addresses #169, add OpenURL interface hooks
Addresses #170, Put "Link" option before "Import" in drop-down menu
Fixes some advanced search flaws (there are still bugs)
Closes#152, Saved Searches (interface layer)
For now, advanced search IS a saved search.
There are still bugs. The 'search' icon is ugly. I wanted to get it out there, however.
