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4.0 4.0 1.0 15.07 MB

License: MIT License

Java 100.00%

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chartygui's Issues

Documentation

A README file (preferably MarkDown) should suffice.

While ambiguous grammars are unavoidable in natural language parsing, non-terminating ones are unacceptable. The parser should detect and warn about all recursive loops that consume no input, like this one:

A -> B C
B -> A

Distinguish Terminals and Non-Terminals

Terminals in the grammar (like N -> cat) should be easily distinguishable from non-terminals like VP -> V NP. This could be achieved by enclosing literal strings in double-quotes: N -> "cat".

"New file" action

Creating an empty grammar with a "New File" action in the menu.
Maybe defaulting to load the example grammar as unspecified file.

Better CFG Syntax

The syntax for specifying the context-free grammar isn't very expressive, some enhancements would be:

allow grouping, optional parts (?) repetition (* and +) in right-hand sides (RHS) of rules:

A -> (B C?)+ D*
more than one RHS, separated by e.g. |:
```
Lit -> NumLit
     | StrLit
```

Displaying large images causes exception

Parsing a large sentence like Mary killed the man with the tie with the tie with the tie with the tie with the tie with the tie with the tie with the tie with the tie with the tie with the tie with the tie with the tie with the tie causes following exception:

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
    at java.awt.image.DataBufferInt.<init>(DataBufferInt.java:41)
    at java.awt.image.Raster.createPackedRaster(Raster.java:458)
    at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:1015)
    at java.awt.image.BufferedImage.<init>(BufferedImage.java:324)
    at de.woerteler.tree.ImageDisplay.getImage(ImageDisplay.java:38)
    at de.woerteler.charty.ParseTree.getImage(ParseTree.java:42)
    at de.woerteler.gui.Controller.navigate(Controller.java:102)
    at de.woerteler.gui.ParseTreeViewer$3.actionPerformed(ParseTreeViewer.java:102)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
    at java.awt.Component.processMouseEvent(Component.java:6373)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
    at java.awt.Component.processEvent(Component.java:6138)
    at java.awt.Container.processEvent(Container.java:2085)
    at java.awt.Component.dispatchEventImpl(Component.java:4735)
    at java.awt.Container.dispatchEventImpl(Container.java:2143)
    at java.awt.Component.dispatchEvent(Component.java:4565)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4621)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4282)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212)
    at java.awt.Container.dispatchEventImpl(Container.java:2129)
    at java.awt.Window.dispatchEventImpl(Window.java:2478)
    at java.awt.Component.dispatchEvent(Component.java:4565)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:679)
    at java.awt.EventQueue.access$000(EventQueue.java:85)
    at java.awt.EventQueue$1.run(EventQueue.java:638)
    at java.awt.EventQueue$1.run(EventQueue.java:636)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)

And a picture:

Custom display types

Allow the use of custom display types. Realized with the help of the ini file introduced in #11.
A display type field where the class name of the display type can be set and the specified class is
constructed at start up (default constructor). This allows to use own display types (must be included in
the class path though).

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