RL tutorial Advanced Searching

ROMLister is a search tool. The fun part is that you can search for an unlimited number of items, and group those items any way you'd like to.

You may have noticed when playing around with the checkboxes on the main page that the text on the bottom of the screen changed as you clicked various options.

ROMLister -find criteria

That text in the -find window is what gets sent into the search engine. Any ROM that meets all of the criteria supplied, gets put into the output list.
Let's examine a simple search query of "Any game that is 3 buttons or less, and uses an 8-way joystick"
The following text is what gets built by the quick-find wizard: (yeah, there's a little more text, but this is the core of it)

(numButtons=3 | numButtons=2 | numButtons=1 | numButtons=0) & joy8way

Here's the same query in slightly more human-readable format:

( numButtons=3 OR numButtons=2 OR numButtons=1 OR numButtons=0 ) AND joy8way

Remember back in math class with order of operations? You do stuff in the parenthesis first, then take the results of that "group" and continue working through the problem. Same deal here.
In this example, ROMLister will check each game and see if it is a 3,2,1 or 0 button game. If it is, then it checks to see if the game uses an 8-way joystick. If yes, then the game is added to the output list. If either the game is more than 3 buttons, or the game is not 8-way, then it doesn't get added. This search criteria is checked against every game, and only the ones that match are outputted.

So, with ROMLister, you can put as many of these search parameters as you want in, and you can build up some pretty unique searches. The checkboxes on the main window will do most of the work for you, but you can always go in and tweak things til your heart's content. Because the possible search items is nearly limitless, and the combinations of search items can be grouped in any way, there is no way all the possibilities can be represented with drop-down lists or checkboxes-if you want something complex, you need to do it by hand by tweaking the -find options yourself. Don't worry, it's not that hard to do.

• Note: Once you start changing the -find text by hand, if you click on any of the checkboxes on the main interface, it will overwrite (trash) anything you've typed in, so be careful!

Keep the following key in mind: & means AND. | means OR. ! means NOT For a grouping of text, you can use ' (single quotes) around the text, for example 'Flying Vertical' could limit down the shooters category.

Let's go back to our search from above for 3 buttons or less and an 8way joystick. Now let's put a filter on the results to remove all the vector based games.

To remove vector graphics monitors from showing up, all we need to do is add "& !vector" to the -find list.

Close the working list and start over again, this time add:

(numButtons=3 | numButtons=2 | numButtons=1 | numButtons=0) & joy8way & !vector

That should reduce the number of games by a few.

Let's also take out the games that don't support save states. The tag for that is 'savestate="unsupported"'

ROMLister ignores quote marks, so just add it like this:

(numButtons=3 | numButtons=2 | numButtons=1 | numButtons=0) & joy8way & !vector & !savestate=unsupported

So how do I know what things can be searched on?
The stuff that you can search on is specified by the input XML file. double clicking any ROM name in your working list will display that game's XML data. Here's the data for puckman:

<game name="puckmana" sourcefile="pacman.c" cloneof="puckman" romof="puckman">
	<description>PuckMan (Japan set 2)</description>
	<year>1980</year>
	<manufacturer>Namco</manufacturer>
	<category>Maze</category>
	<controls info>numPlayers="2" alternating="1" mirrored="1" usesService="0" tilt="0" cocktail="1"</controls info>
	<player number="1" numButtons="0">
		<controls>
			<control name="4-way Joystick">
				<constant name="joy4way"/>
			</control>
		</controls>
	<labels>
			<label name="P1_JOYSTICK_RIGHT" value="Right"/>
			<label name="P1_JOYSTICK_LEFT" value="Left"/>
			<label name="P1_JOYSTICK_DOWN" value="Down"/>
			<label name="P1_JOYSTICK_UP" value="Up"/>
		</labels>
	</player>
	<chip type="cpu" name="Z80" clock="3072000"/>
	<chip type="audio" name="Namco" clock="96000"/>
	<display type="raster" rotate="90" width="288" height="224" refresh="60.606061" />
	<sound channels="1"/>
	<input players="2" buttons="1" coins="2">
		<control type="joy4way"/>
	</input>
	<dipswitch name="Rack Test (Cheat)">
		<dipvalue name="Off" default="yes"/>
		<dipvalue name="On"/>
	</dipswitch>
	<dipswitch name="Service Mode">
		<dipvalue name="Off" default="yes"/>
		<dipvalue name="On"/>
	</dipswitch>
	<dipswitch name="Cabinet">
		<dipvalue name="Upright" default="yes"/>
		<dipvalue name="Cocktail"/>
	</dipswitch>
	<dipswitch name="Coinage">
		<dipvalue name="2 Coins/1 Credit"/>
		<dipvalue name="1 Coin/1 Credit" default="yes"/>
		<dipvalue name="1 Coin/2 Credits"/>
		<dipvalue name="Free Play"/>
	</dipswitch>
	<dipswitch name="Lives">
		<dipvalue name="1"/>
		<dipvalue name="2"/>
		<dipvalue name="3" default="yes"/>
		<dipvalue name="5"/>
	</dipswitch>
	<dipswitch name="Bonus Life">
		<dipvalue name="10000" default="yes"/>
		<dipvalue name="15000"/>
		<dipvalue name="20000"/>
		<dipvalue name="None"/>
	</dipswitch>
	<dipswitch name="Difficulty">
		<dipvalue name="Normal" default="yes"/>
		<dipvalue name="Hard"/>
	</dipswitch>
	<dipswitch name="Ghost Names">
		<dipvalue name="Normal" default="yes"/>
		<dipvalue name="Alternate"/>
	</dipswitch>
	<driver status="good" emulation="good" color="good" sound="good" graphic="good" savestate="supported" palettesize="512"/>
</game>

Anything in the above text can be a search parameter. You've got screen orientation, screen refresh rate, resolution, joystick/control types, emulation status, cocktail support, manufacturer, year of release, category, clone or parent, even actual ROM names. You can pick anything in there to search on, and combine multiple searches into a single query.

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