Extensions to Svetovid students

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Extensions to Svetovidstudents submission
environment

• Doni Pracner, Ivan Pribela,Mirjana Ivanovic,
  Zoran Budimac

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Presentation contents

• Introduction
• Overview of Svetovid
• Motivation
• Goals of the extension
• New textual component
• Overview of some of the new features
• Conclusions

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Svetovid

• Special Submission Environment for Students
  Assessment
• Developed at the Department of Mathematics and
  Informatics, Faculty of Science, Novi Sad
• Written in Java cross platform
• Successfully used in several courses

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Svetovid architecture

• Server
• running on one computer
• Any number of clients
• running on other computers
• Both server and clients are written in Java 5
• Recommended server platform
• Windows XP
• Windows NT
• any UNIX platform

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Control (instructor) client

• Prompts a login dialog
• Set of configuration dialogs
• Setting up courses
• Managing students
• Full control over the conduction of practical
  exercises
• Groups, order, timing

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Student client

• Prompts a login dialog
• IDE allowing the student comfortable work
• The files owned by a student are contained in a
  virtual directory

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Student client
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Motivation

• The text component should accommodate the needs
  of programming
• A third party component was built in
• Syntax highlight, parenthesis matching,
• Main problems
• No keyboard shortcuts while editing text
• No automatic indention

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Goals of the extension

• Create a new text component
• Usage of the Java Swing text package
• Keep all of the previous features and add new ones

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CodeEditorPane

• New textual component
• Extends JEditorPane
• Main features
• Syntax highlighting
• Marking bracket pairs
• Line numbering
• Indent preservation
• Measures against cheating
• Convenience methods for applications

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Syntax Highlight (1/2)

• Done in a separate object representing the
  language
• Interface ProgramLang
• Language properties
• Methods for syntax highlighting
• Whole document
• Segment
• Expanded segment

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Syntax Highlighting (2/2)

• Class DefaultLang default implementation
• an empty language
• Flexible scanner, easy to extend into new
  languages
• Currently supported languages Java, Scheme,
  Modula2 and TeX
• PlainTextLang for simple textual files
• Automatic detection of languages (extensions)

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Parenthesis matching

• Pairs of parenthesis usually have a meaning in
  program code
• Usage of the Highlighter interface

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Line numbering

• Made as a separate text pane with line numbers
• Should be built in a JScrollPane as a row header

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Code indention

• Helps to make more readable code
• On line breaks, the indent from the previous line
  is copied

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Measures against cheating

• Usage of the system clipboard is forbidden
• Overriding cut, copy and paste methods
• Using a local static clipboard

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Convenience methods for visual implementation

• Status bar
• Row and column of the caret
• Currently active language for highlighting
• Toolbar
• Programming language selection
• Manual syntax highlight refresh
• Line numbering component
• Fully set up JPanel with the component

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Conclusion

• CodeEditorPane
• Support for all existing features, adding new
  ones
• Flexible syntax highlight system
• Simple to build in into existing applications
• Does not break existing Swing text mechanisms
• Unfortunately the new component has not yet been
  implemented into Svetovid

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Thank you for your attention