April 16, 2012; Stephen B. Wampler
This file is in the public domain.
This program is a simple interpreter for pure Lisp. It takes the
name of the Lisp program as a command-line argument.
The syntax and semantics are based on EV-LISP, as described in
Laurent Siklossy's "Let's Talk LISP" (Prentice-Hall, 1976, ISBN
0-13-532762-8). Functions that have been predefined match those
described in Chapters 1-4 of the book.
No attempt at improving efficiency has been made, this is
rather an example of how a simple LISP interpreter might be
implemented in Icon.
The language implemented is case-insensitive.
It only reads enough input lines at one time to produce at least
one LISP-expression, but continues to read input until a valid
LISP-expression is found.
It first reads in files listed on command line, switches
to reading standard input, and terminates with the first (exit)
instruction.
Errors:
Fails with error message if current input cannot be made into
a valid LISP-expression (i.e. more right than left parens).
See HELP function at end of file for syntax summary/examples.
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