CS 394P: Introduction to GLISP

Due: April 6, 2005.

The goals of this exercise are to begin using GLISP and to try it on some examples.

/p/bin/xgcl (Gnu Common Lisp with X interface) should be used for the GLISP exercises. Use (load "/u/novak/gll") on a Linux workstation, or (load "/u/novak/gl") on a Sun workstation, to load the GLISP files. Use (bye) to exit Lisp.

1. Examine the code in the file glexample.lsp and compile and run the examples and write additions as shown in the file. Hand in a copy of your Lisp output showing the examples and your code. A GLISP function is compiled automatically the first time it is called, so it is not necessary to compile functions explicitly; you can use (glp) after running a function to see the compiled code.

   Some useful functions are:

   • (GLC fn) GLISP Compile the function fn
   • (GLP fn) Print compiled form of the function fn
   • (GLP) Print compiled form of the last function compiled
   • (GLCP fn) Compile and Print the function fn
   • (PP fn) Pretty-print source form of the function fn
   • (PPL sym) Pretty-print the property list of symbol sym
   • (STR type) Print the data structure of the type
   • (FB fn) True if fn has a Function Binding (definition)
   • (LD file) Load file.lsp from the GLISP directory, e.g. (ld glexample)

2. Write a glispobjects description for a data structure that has circle as a superclass. Test it to verify that circle properties are available by inheritance.

3. Write a glispobjects description for a data structure that could be viewed as a vector. Write a glispobjects description for the vector view and verify that vector properties, such as magnitude, are available through the view. The file /u/novak/glisp/vector.lsp contains definitions for vectors.

4. Run GEV (GLISP Edit Value) on the HPP data, using (gev hpp), and on examples of your data to understand how GEV works.
   • (GEV data 'type) Run GEV. type is not necessary for object data.
   • left button On a field name, prints the type of the field. On data, zooms in on that data.
   • right button Causes a pop-up command menu to appear. QUIT is part of this menu.
   • PROGRAM Write a looping program over current data. Write programs for:
     • Total budget labor over all contracts
     • Total executives salary
     • Average zip code of the sponsors of contracts