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8 | CHAPTER 13 | |
9 | ||
10 | ||
11 | The CMU User Toplevel and the File Package | |
12 | ||
13 | ||
14 | ||
15 | This documentation was written by Don Cohen, and the func- | |
16 | tions described below were imported from PDP-10 CMULisp. | |
17 | ||
18 | _\bN_\bo_\bn _\bC_\bM_\bU _\bu_\bs_\be_\br_\bs _\bn_\bo_\bt_\be: this is not the default top level for | |
19 | your Lisp system. In order to start up this top level, you | |
20 | should type (_\bl_\bo_\ba_\bd '_\bc_\bm_\bu_\be_\bn_\bv). | |
21 | ||
22 | ||
23 | ||
24 | ||
25 | 13.1. User Command Input Top Level | |
26 | ||
27 | The top-level is the function that reads what you | |
28 | type, evaluates it and prints the result. The _\bn_\be_\bw_\bl_\bi_\bs_\bp | |
29 | top-level was inspired by the CMULisp top-level (which | |
30 | was inspired by interlisp) but is much simpler. The | |
31 | top-level is a function (of zero arguments) that can | |
32 | be called by your program. If you prefer another | |
33 | top-level, just redefine the top-level function and | |
34 | type "(reset)" to start running it. The current top- | |
35 | level simply calls the functions tlread, tleval and | |
36 | tlprint to read, evaluate and print. These are sup- | |
37 | posed to be replaceable by the user. The only one | |
38 | that would make sense to replace is tlprint, which | |
39 | currently uses a function that refuses to go below a | |
40 | certain level and prints "...]" when it finds itself | |
41 | printing a circular list. One might want to pretty- | |
42 | print the results instead. The current top-level | |
43 | numbers the lines that you type to it, and remembers | |
44 | the last n "events" (where n can be set but is | |
45 | defaulted to 25). One can refer to these events in | |
46 | the following "top-level commands": | |
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59 | ||
60 | \e9 | |
61 | ||
62 | \e9The CMU User Toplevel and the File Package 13-1 | |
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64 | ||
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66 | ||
67 | ||
68 | ||
69 | ||
70 | The CMU User Toplevel and the File Package 13-2 | |
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72 | ||
73 | ||
74 | ____________________________________________________ | |
75 | ||
76 | _\bT_\bO_\bP_\bL_\bE_\bV_\bE_\bL _\bC_\bO_\bM_\bM_\bA_\bN_\bD _\bS_\bU_\bM_\bM_\bA_\bR_\bY | |
77 | ||
78 | ?? prints events - both the input and the result. If you just type | |
79 | "??" you will see all of the recorded events. "?? 3" will show | |
80 | only event 3, and "?? 3 6" will show events 3 through 6. | |
81 | ||
82 | redo pretends that you typed the same thing that was typed before. If | |
83 | you type "redo 3" event number 3 is redone. "redo -3" redoes the | |
84 | thing 3 events ago. "redo" is the same as "redo -1". | |
85 | ||
86 | ed calls the editor and then does whatever the editor returns. Thus | |
87 | if you want to do event 5 again except for some small change, you | |
88 | can type "ed 5", make the change and leave the editor. "ed -3" | |
89 | and "ed" are analogous to redo. | |
90 | ____________________________________________________ | |
91 | ||
92 | ||
93 | ||
94 | Finally, you can get the value of event 7 with the function | |
95 | (valueof 7). The other interesting feature of the top-level | |
96 | is that it makes outermost parentheses superfluous for the | |
97 | most part. This works the same way as in CMULisp, so you | |
98 | can use the help for an explanation. If you're not sure and | |
99 | don't want to risk it you can always just include the | |
100 | parentheses. | |
101 | ||
102 | ||
103 | (top-level) | |
104 | ||
105 | SIDE EFFECT: _\bt_\bo_\bp-_\bl_\be_\bv_\be_\bl is the LISP top level function. | |
106 | As well as being the top level function | |
107 | with which the user interacts, it can be | |
108 | called recursively by the user or any | |
109 | function. Thus, the top level can be | |
110 | invoked from inside the editor, break | |
111 | package, or a user function to make its | |
112 | commands available to the user. | |
113 | ||
114 | NOTE: The CMU FRANZ LISP top-level uses _\bl_\bi_\bn_\be_\br_\be_\ba_\bd | |
115 | rather than _\br_\be_\ba_\bd. The difference will not usu- | |
116 | ally be noticeable. The principal thing to be | |
117 | careful about is that input to the function or | |
118 | system being called cannot appear on the same | |
119 | line as the top-level call. For example, typing | |
120 | (_\be_\bd_\bi_\bt_\bf _\bf_\bo_\bo)_\bf_\bP _\bo_\bn _\bo_\bn_\be _\bl_\bi_\bn_\be _\bw_\bi_\bl_\bl _\be_\bd_\bi_\bt _\bf_\bo_\bo _\ba_\bn_\bd | |
121 | _\be_\bv_\ba_\bl_\bu_\ba_\bt_\be _\bP, _\bn_\bo_\bt _\be_\bd_\bi_\bt _\bf_\bo_\bo _\ba_\bn_\bd _\be_\bx_\be_\bc_\bu_\bt_\be _\bt_\bh_\be _\bp _\bc_\bo_\bm_\b- | |
122 | _\bm_\ba_\bn_\bd _\bi_\bn _\bt_\bh_\be _\be_\bd_\bi_\bt_\bo_\br. _\bt_\bo_\bp-_\bl_\be_\bv_\be_\bl _\bs_\bp_\be_\bc_\bi_\ba_\bl_\bl_\by _\br_\be_\bc_\bo_\bg_\b- | |
123 | _\bn_\bi_\bz_\be_\bs _\bt_\bh_\be _\bf_\bo_\bl_\bl_\bo_\bw_\bi_\bn_\bg _\bc_\bo_\bm_\bm_\ba_\bn_\bd_\bs: | |
124 | ||
125 | \e9 | |
126 | ||
127 | \e9 Printed: July 21, 1983 | |
128 | ||
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133 | ||
134 | ||
135 | The CMU User Toplevel and the File Package 13-3 | |
136 | ||
137 | ||
138 | (valueof '_\bg__\be_\bv_\be_\bn_\bt_\bs_\bp_\be_\bc) | |
139 | ||
140 | RETURNS: the value(s) of the event(s) specified by | |
141 | g_eventspec. If a single event is specified, | |
142 | its value will be returned. If more than one | |
143 | event is specified, or an event has more than | |
144 | one subevent (as for _\br_\be_\bd_\bo, etc), a list of | |
145 | vlaues will be returned. | |
146 | ||
147 | ||
148 | ||
149 | ||
150 | 13.2. The File Package | |
151 | ||
152 | Users typically define functions in lisp and then want | |
153 | to save them for the next session. If you do | |
154 | (_\bc_\bh_\ba_\bn_\bg_\be_\bs), a list of the functions that are newly | |
155 | defined or changed will be printed. When you type | |
156 | (_\bd_\bs_\bk_\bo_\bu_\bt_\bs), the functions associated with files will be | |
157 | saved in the new versions of those files. In order to | |
158 | associate functions with files you can either add them | |
159 | to the _\bf_\bi_\bl_\be_\bf_\bn_\bs list of an existing file or create a | |
160 | new file to hold them. This is done with the _\bf_\bi_\bl_\be | |
161 | function. If you type (_\bf_\bi_\bl_\be _\bn_\be_\bw) the system will | |
162 | create a variable called _\bn_\be_\bw_\bf_\bn_\bs. You may add the | |
163 | names of the functions to go into that file to _\bn_\be_\bw_\bf_\bn_\bs. | |
164 | After you do (_\bc_\bh_\ba_\bn_\bg_\be_\bs), the functions which are in no | |
165 | other file are stored in the value of the atom | |
166 | _\bc_\bh_\ba_\bn_\bg_\be_\bs. To put these all in the new file, (_\bs_\be_\bt_\bq | |
167 | _\bn_\be_\bw_\bf_\bn_\bs (_\ba_\bp_\bp_\be_\bn_\bd _\bn_\be_\bw_\bf_\bn_\bs _\bc_\bh_\ba_\bn_\bg_\be_\bs)). Now if you do | |
168 | (_\bc_\bh_\ba_\bn_\bg_\be_\bs), all of the changed functions should be | |
169 | associated with files. In order to save the changes | |
170 | on the files, do (_\bd_\bs_\bk_\bo_\bu_\bt_\bs). All of the changed files | |
171 | (such as NEW) will be written. To recover the new | |
172 | functions the next time you run FRANZ LISP, do (_\bd_\bs_\bk_\bi_\bn | |
173 | _\bn_\be_\bw). | |
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190 | \e9 | |
191 | ||
192 | \e9 Printed: July 21, 1983 | |
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198 | ||
199 | ||
200 | The CMU User Toplevel and the File Package 13-4 | |
201 | ||
202 | ||
203 | ||
204 | ____________________________________________________ | |
205 | ||
206 | Script started on Sat Mar 14 11:50:32 1981 | |
207 | $ newlisp | |
208 | Welcome to newlisp... | |
209 | 1.(defun square (x) (* x x)) ; define a new function | |
210 | square | |
211 | 2.(changes) ; See, this function is associated | |
212 | ; with no file. | |
213 | <no-file> (square)nil | |
214 | 3.(file 'new) ; So let's declare file NEW. | |
215 | new | |
216 | 4.newfns ; It doesn't have anything on it yet. | |
217 | nil | |
218 | 5.(setq newfns '(square)) ; Add the function associated | |
219 | (square) ; with no file to file NEW. | |
220 | 6.(changes) ; CHANGES magically notices this fact. | |
221 | ||
222 | new (square)nil | |
223 | 7.(dskouts) ; We write the file. | |
224 | creating new | |
225 | (new) | |
226 | 8.(dskin new) ; We read it in! | |
227 | (new) | |
228 | 14.Bye | |
229 | $ | |
230 | script done on Sat Mar 14 11:51:48 1981 | |
231 | ||
232 | ____________________________________________________ | |
233 | ||
234 | ||
235 | ||
236 | ||
237 | ||
238 | (changes s_flag) | |
239 | ||
240 | RETURNS: Changes computes a list containing an entry | |
241 | for each file which defines atoms that have | |
242 | been marked changed. The entry contains the | |
243 | file name and the changed atoms defined | |
244 | therein. There is also a special entry for | |
245 | changes to atoms which are not defined in any | |
246 | known file. The global variable _\bf_\bi_\bl_\be_\bl_\bs_\bt con- | |
247 | tains the list of "known" files. If no flag | |
248 | is passed this result is printed in human | |
249 | readable form and the value returned is t if | |
250 | there were any changes and nil if not. Other- | |
251 | wise nothing is printed and the computer list | |
252 | is returned. The global variable _\bc_\bh_\ba_\bn_\bg_\be_\bs con- | |
253 | tains the atoms which are marked changed but | |
254 | not yet associated with any file. The _\bc_\bh_\ba_\bn_\bg_\be_\bs | |
255 | function attempts to associate these names | |
256 | ||
257 | ||
258 | Printed: July 21, 1983 | |
259 | ||
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263 | ||
264 | ||
265 | ||
266 | The CMU User Toplevel and the File Package 13-5 | |
267 | ||
268 | ||
269 | with files, and any that are not found are | |
270 | considered to belong to no file. The _\bc_\bh_\ba_\bn_\bg_\be_\bs | |
271 | property is the means by which changed func- | |
272 | tions are associated with files. When a file | |
273 | is read in or written out its _\bc_\bh_\ba_\bn_\bg_\be_\bs property | |
274 | is removed. | |
275 | ||
276 | (dc s_word s_id [ g_descriptor1 ... ] <text> <esc>) | |
277 | ||
278 | RETURNS: _\bd_\bc defines comments. It is exceptional in | |
279 | that its behavior is very context dependent. | |
280 | When _\bd_\bc is executed from _\bd_\bs_\bk_\bi_\bn it simply | |
281 | records the fact that the comment exists. It | |
282 | is expected that in interactive mode comments | |
283 | will be found via _\bg_\be_\bt_\bd_\be_\bf - this allows large | |
284 | comments which do not take up space in your | |
285 | core image. When _\bd_\bc is executed from the ter- | |
286 | minal it expects you to type a comment. _\bd_\bs_\bk_\bo_\bu_\bt | |
287 | will write out the comments that you define | |
288 | and also copy the comments on the old version | |
289 | of the file, so that the new version will keep | |
290 | the old comments even though they were never | |
291 | actually brought into core. The optional id | |
292 | is a mechanism for distinguishing among | |
293 | several comments associated with the same | |
294 | word. It defaults to nil. However if you | |
295 | define two comments with the same id, the | |
296 | second is considered to be a replacement for | |
297 | the first. The behavior of _\bd_\bc is determined by | |
298 | the value of the global variable _\bd_\be_\bf-_\bc_\bo_\bm_\bm_\be_\bn_\bt. | |
299 | _\bd_\be_\bf-_\bc_\bo_\bm_\bm_\be_\bn_\bt contains the name of a function | |
300 | that is run. Its arguments are the word, id | |
301 | and attribute list. _\bd_\be_\bf-_\bc_\bo_\bm_\bm_\be_\bn_\bt is initially | |
302 | _\bd_\bc-_\bd_\be_\bf_\bi_\bn_\be. Other functions rebind it to _\bd_\bc- | |
303 | _\bh_\be_\bl_\bp, _\bd_\bc-_\bu_\bs_\be_\br_\bh_\be_\bl_\bp, and the value of _\bd_\bs_\bk_\bi_\bn- | |
304 | _\bc_\bo_\bm_\bm_\be_\bn_\bt. The comment property of an atom is a | |
305 | list of entries, each representing one com- | |
306 | ment. Atomic entries are assumed to be iden- | |
307 | tifiers of comments on a file but not in core. | |
308 | In-core comments are represented by a list of | |
309 | the id, the attribute list and the comment | |
310 | text. The comment text is an uninterned atom. | |
311 | Comments may be deleted or reordered by edit- | |
312 | ing the comment property. | |
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320 | ||
321 | \e9 | |
322 | ||
323 | \e9 Printed: July 21, 1983 | |
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326 | ||
327 | ||
328 | ||
329 | ||
330 | ||
331 | The CMU User Toplevel and the File Package 13-6 | |
332 | ||
333 | ||
334 | (dskin l_filenames) | |
335 | ||
336 | SIDE EFFECT: READ-EVAL-PRINTs the contents of the | |
337 | given files. This is the function to use | |
338 | to read files created by _\bd_\bs_\bk_\bo_\bu_\bt. _\bd_\bs_\bk_\bi_\bn | |
339 | also declares the files that it reads (if | |
340 | a _\bf_\bi_\bl_\be-_\bf_\bn_\bs list is defined and the file is | |
341 | otherwise declarable by _\bf_\bi_\bl_\be ), so that | |
342 | changes to it can be recorded. | |
343 | ||
344 | ||
345 | (dskout s_file1 ...) | |
346 | ||
347 | SIDE EFFECT: For each file specified, _\bd_\bs_\bk_\bo_\bu_\bt assumes | |
348 | the list named filenameFNS (i.e., the | |
349 | file name, excluding extension, con- | |
350 | catenated with _\bf_\bn_\bs ) contains a list | |
351 | of function names, etc., to be loaded Any | |
352 | previous version of the file will be | |
353 | renamed to have extension ".back". | |
354 | ||
355 | (dskouts s_file1 ...) | |
356 | ||
357 | SIDE EFFECT: applies _\bd_\bs_\bk_\bo_\bu_\bt to and prints the name of | |
358 | each s_filei (with no additional | |
359 | arguments, assuming filenameFNS to be a | |
360 | list to be loaded) for which s_file_\bi is | |
361 | either not in _\bf_\bi_\bl_\be_\bl_\bs_\bt (meaning it is a | |
362 | new file not previously declared by _\bf_\bi_\bl_\be | |
363 | or given as an argument to _\bd_\bs_\bk_\bi_\bn, | |
364 | _\bd_\bs_\bk_\bo_\bu_\bt_\bs, or _\bd_\bs_\bk_\bo_\bu_\bt_\bs) or is in _\bf_\bi_\bl_\be_\bl_\bs_\bt and | |
365 | has some recorded changes to definitions | |
366 | of atoms in filenameFNS, as recorded by | |
367 | _\bm_\ba_\br_\bk!_\bc_\bh_\ba_\bn_\bg_\be_\bd and noted by changes. If | |
368 | _\bf_\bi_\bl_\bei is not specified, _\bf_\bi_\bl_\be_\bl_\bs_\bt will be | |
369 | used. This is the most common way of | |
370 | using dskouts. Typing (_\bd_\bs_\bk_\bo_\bu_\bt_\bs) will | |
371 | save every file reported by (_\bc_\bh_\ba_\bn_\bg_\be_\bs) | |
372 | to have changed definitions. | |
373 | ||
374 | ||
375 | (dv s_atom g_value) | |
376 | ||
377 | EQUIVALENT TO: (_\bs_\be_\bt_\bq _\ba_\bt_\bo_\bm '_\bv_\ba_\bl_\bu_\be). _\bd_\bv calls | |
378 | _\bm_\ba_\br_\bk!_\bc_\bh_\ba_\bn_\bg_\be_\bd. | |
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385 | ||
386 | \e9 | |
387 | ||
388 | \e9 Printed: July 21, 1983 | |
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395 | ||
396 | The CMU User Toplevel and the File Package 13-7 | |
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398 | ||
399 | (file 's_file) | |
400 | ||
401 | SIDE EFFECT: declares its argument to be a file to be | |
402 | used for reporting and saving changes to | |
403 | functions by adding the file name to a | |
404 | list of files, _\bf_\bi_\bl_\be_\bl_\bs_\bt. _\bf_\bi_\bl_\be is called | |
405 | for each file argument of _\bd_\bs_\bk_\bi_\bn, _\bd_\bs_\bk_\bo_\bu_\bt, | |
406 | and _\bd_\bs_\bk_\bo_\bu_\bt_\bs. | |
407 | ||
408 | (file-fns 's_file) | |
409 | ||
410 | RETURNS: the name of the fileFNS list for its file | |
411 | argument s_file. | |
412 | ||
413 | (getdef 's_file ['s_i1 ...]) | |
414 | ||
415 | SIDE EFFECT: selectively executes definitions for atoms | |
416 | s_i1 ... from the specified file. Any of | |
417 | the words to be defined which end with "@" | |
418 | will be treated as patterns in which the @ | |
419 | matchs any suffix (just like the editor). | |
420 | _\bg_\be_\bt_\bd_\be_\bf is driven by _\bg_\be_\bt_\bd_\be_\bf_\bt_\ba_\bb_\bl_\be (and thus | |
421 | may be programmed). It looks for lines in | |
422 | the file that start with a word in the | |
423 | table. The first character must be a "(" | |
424 | or "[" followed by the word, followed by a | |
425 | space, return or something else that will | |
426 | not be considered as part of the identif- | |
427 | ier by _\br_\be_\ba_\bd, e.g., "(" is unacceptable. | |
428 | When one is found the next word is read. | |
429 | If it matches one of the identifiers in | |
430 | the call to _\bg_\be_\bt_\bd_\be_\bf then the table entry is | |
431 | executed. The table entry is a function | |
432 | of the expression starting in this line. | |
433 | Output from _\bd_\bs_\bk_\bo_\bu_\bt is in acceptable format | |
434 | for _\bg_\be_\bt_\bd_\be_\bf. _\bg_\be_\bt_\bd_\be_\bf | |
435 | ||
436 | RETURNS: a list of the words which match the ones it | |
437 | looked for, for which it found (but, depending | |
438 | on the table, perhaps did not execute) in the | |
439 | file. | |
440 | ||
441 | NOTE: _\bg_\be_\bt_\bd_\be_\bf_\bt_\ba_\bb_\bl_\be is the table that drives _\bg_\be_\bt_\bd_\be_\bf. It | |
442 | is in the form of an association list. Each ele- | |
443 | ment is a dotted pair consisting of the name of a | |
444 | function for which _\bg_\be_\bt_\bd_\be_\bf searches and a function | |
445 | of one argument to be executed when it is found. | |
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449 | ||
450 | ||
451 | \e9 | |
452 | ||
453 | \e9 Printed: July 21, 1983 | |
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459 | ||
460 | ||
461 | The CMU User Toplevel and the File Package 13-8 | |
462 | ||
463 | ||
464 | (mark!changed 's_f) | |
465 | ||
466 | SIDE EFFECT: records the fact that the definition of | |
467 | s_f has been changed. It is automatically | |
468 | called by _\bd_\be_\bf, _\bd_\be_\bf_\bu_\bn, _\bd_\be, _\bd_\bf, _\bd_\be_\bf_\bp_\br_\bo_\bp, _\bd_\bm, | |
469 | _\bd_\bv, and the editor when a definition is | |
470 | altered. | |
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516 | \e9 | |
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518 | \e9 Printed: July 21, 1983 | |
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521 |