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Welcome
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Preface
Part I
Chap 1
Chap 2
Chap 3
XEmacs
Chap 4
Chap 5
Chap 6
Chap 7
Chap 8
Chap 9
Part II
Chap 10
Chap 11
Chap 12
Chap 13
Chap 14
Chap 15
Chap 16
Chap 17
Chap 18
Chap 19
Chap 20
Chap 21
Chap 22
Chap 23
Part III
Chap 24
Chap 25
Chap 26
Chap 27
Chap 28
Chap 29
Chap 30
Chap 31
Chap 32
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CHAPTER 12: SAVING FOR ANOTHER DAY
- Notes
-
- Read Chapter 12, along with these Notes.
- You have been using XEmacs since Chapter 4. You have mainly
been using the Inferior Common Lisp mode to interact with the
Lisp listener. You have also been using the Common Lisp mode to
prepare the
.cl files you have been submiting.
Starting now, you will also be using XEmacs to create and edit
files of Lisp source code. Lisp source files should also have the
extension of .cl, and you should edit them in the Common
Lisp mode, which XEmacs will set automatically whenever you edit a
file that has the .cl extension, whether or not that file
previously existed.
XEmacs will also recognize files with the .lisp
extension as Common Lisp source files, but let's be modern and use
.cl
Some useful commands available in Common Lisp mode are:
| Close all open parentheses or eliminate extra right
parentheses | C-c ] |
| Comment out region | C-c ; |
| Complete Lisp symbol | M-TAB |
| Re-indent current line | TAB |
| Re-indent S-expression | M-C-q |
| To previous first-column "(" | M-C-a |
| To beginning of enclosing list | M-C-u |
| Forward one S-expression | M-C-f |
| Backward one S-expression | M-C-b |
| Kill one S-expression | M-C-k |
| Evaluate enclosing defun | C-u M-C-x |
| Evaluate buffer | C-u C-c C-b |
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(Note that M-C-a means hold down both the meta and the
control keys while typing an "a", or first type the escape key and then
hold down the control key while typing an "a".)
Remember, you can see all the commands available in whatever mode you're in by
typing C-h m
- The text introduces the
load function on page
78. To load a file from the Lisp listener, you can evaluate
(load "filename")
or use the acl command
:ld filename
If you use the :ld command, you can type the filename
with upper- and/or lower-case characters, exactly as you created it,
without using quote marks or escape characters.
ACL compiled files have the extension .fasl
Unfortunately, if you try to load a file, and don't type its
extension, and there is both a .cl file and a
.fasl file, acl will load the .fasl file, even if
the .cl file is newer.
- Filenames can be complete paths. For example, you can do
(load "~/CSE202/ch12")
or use the acl command
:ld ~/CSE202/ch12
Of course, if you specified ~/CSE202 as the Process
directory when you executed M-x run-cl you don't need to
include that part of the path. You can see what "Lisp's current
working directory" is by typing the acl command
:pwd
and you can change that directory by typing the acl command
:cd directory path
- If you are editing a Lisp source file, an even easier way of
loading it into your Lisp environment is, with your cursor in the
source file buffer, type
C-u C-c C-b
- On pages 80-81, please remember that the Common Lisp we are
using abides by the new standard (ANSI Common Lisp), so use the
defpackage form rather than the forms shown on lines 4 -
26 of page 80.
You should include only the defpackage subforms you
need, or include them all and comment out the ones you don't need.
- The book has two sets of exercises, each of which forms a
"term project". Everyone is to do project p1 because students
in the past have had a lot of trouble with project p2.
The p1 project is a small rule-based system and a mini-version of Eliza.
In preparation, you should browse the overview and specification
of project p1, which is available as a dvi
document, and as a PostScript
document.
A version of Eliza that is much more complete than the one you
will write is available within XEmacs by typing M-x
doctor Try it. Pretend you are a patient talking to your
psycotherapist.
- Exercises
-
- Create a file named
match.cl containing the
following, with appropriate information replacing the question marks.
----------------------- cut here -----------------------
;;; The MATCH file
;;; by ???
;;; begun on: ???
;;; as answers to Project p1 in
;;; S. C. Shapiro, Common Lisp: An Interactive Approach,
;;; Computer Science Press, 1992
;;;
;;; This file satisfies the exercises through Exercise ???
;;;
(defpackage match)
(in-package match)
----------------------- cut here -----------------------
- Do Exercise 12.2.
- Compile your
match.cl file either according to the
directions given in Exercise 12.3, or simply by doing
:cf filename
If you get any warnings or error messages from the compiler, edit your
source file to correct the problem, and recompile it.
- Do Exercise 12.4 using the
:ld command. Test the
compiled version of the function you wrote.
- Submit the
.cl file you wrote for this Chapter.
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