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Groan

Last updated: 08.05.2002

Notes

Grammar format

The grammars parsed by the present Groan system are context-free grammars. They consist of a set of rules that expand non-terminal nodes (categories) into sequences of non-terminal and terminal nodes (words). The first symbol in the grammar is always called 'top'. For example:

Grammar	Generates
`top --> s;` `s --> np vp np;` `np --> det n;` `vp --> v;` `v --> "kicks";` `v --> "strokes";` `det --> "the";` `n --> "cat";` `n --> "dog";` `n --> "boy";` `n --> "girl";`	The boy kicks the dog. The girl strokes the cat. The cat kicks the dog. The boy strokes the girl. etc.

Each rule in the grammar must be terminated by a semi-colon, and the head of the rule is separated from the body by '-->'. The body of the rule may contain preterminals (symbols consisting of the letters 'a..z', 'A..Z' and '_') or terminals (quoted strings, delimited by double quotes).

Groan performs no recursion checking so be careful not to create infinite loops in your grammars.

Files

Filename	Description	Java	Class
GroanPanelApplet	Implements an applet that generates and displays random texts.
RTNGrammar	Implements a class of objects to represent simple RTN grammars.
RTNParser	Implements a parser to read RTN grammars from a text file.
RTNGrammarNode	Basic element of the RTNGrammar, this represents the base class for grammar nodes.
RTNGrammarPreTerminal	A subclass of RTNGrammarNode, this class implements nodes which can be further expanded (i.e. syntactic categories).
RTNGrammarTerminal	A subclass of RTNGrammarNode, this class implements terminal nodes (i.e. lexical items).
ImageButton	Implements a simple button that displays an image and responds to mouse-clicks.
TextDisplayPane	Implements a pane that can display a block of text
ExtendedApplet	Implements parameter parsing and other frequently-required applet functionality.
Project Archive (StuffIt)	Sources and CodeWarrior project in StuffIt 5 format for Macintosh users.
Project Archive (ZIP)	Sources in ZIP format for PC users.
To download source or class files, click on the file icon with your right mouse button (Windows/UNIX) or click and hold (Macintosh) and choose "Save ..." or "Download ...". Archives containing the sources for this applet are provided in StuffIt 5 and Zip format.

Parameters

Parameter	Type	Values	Default	Notes
grammar	String	-	-	Partial URL to a grammar file to be used for text-generation.
button-image	String	-	-	Partial URL to an image file to be used to display a 'More' button. If no image is specified
button-label	String	-	Generate	Label to be used for the button which allows the user to generate more texts. This will be used only if no image button is provided.
show-generate-button	Boolean	yes, no	yes	If true
font	String	-	TimesRoman plain 12	Specification of the font to be used for display in format 'family face size'.
background-color	Color	#rrggbb	#FFFFFF	Color to be used for the background of the displayed text.
text-color	Color	#rrggbb	#000000	Color to be used for the text displayed.
shadow-color	Color	#rrggbb	#CCCCCC	Color used for text shadow if shown.
shadow-offset	int	-	0	Distance by which text shadow is offset from text. If the offset is 0

Groan

Notes

Files

Parameters

Test Applet