382:, when a macro-like mechanism was provided to allow people to define their own rules for combining methods. Prior to that the rules governing combination of before/after methods and so-called whoppers methods (around) was fixed, and the compiler just generated the code for that. There were things called wrappers, which had macro-like behavior, but I forget when they came around. Traipsing through the various versions of MacLisp and Lispm manual to get this part of the history exactly right could be interesting. Or it could be that Howard Cannon or David Moon or someone could actually remember it all exactly.
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or the advice may change essential variables and continue with the computation so that the original procedure is executed, but with modified variables. Finally, the advice may not alter the execution or affect the original procedure at all, e.g., it may merely perform some additional computation such as printing a message or recording history. Since advice can be conditional, the decision as to what is to be done can depend on the results of the computation up to that point.
62:-addon makes extensive use of advice: it must modify thousands of existing Emacs modules and functions such that it can produce audio output for the blind corresponding to the visual presentation, but it would be infeasible to copy all of them and redefine them to produce audio output in addition to their normal outputs; so, the Emacspeak programmers define advice functions which run before and after.
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Since each piece of advice is itself a procedure, it has its own entries and exits. In particular, this means that the execution of advice can cause the procedure that it modifies to be bypassed completely, e.g., by specifying as an exit from the advice one of the exits from the original procedure;
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Advising is the basic innovation in the model, and in the PILOT system. Advising consists of inserting new procedures at any or all of the entry or exit points to a particular procedure (or class of procedures). The procedures inserted are called "advice procedures" or simply
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developers and maintainers of Lisp packages and modules never use advice, since there is no advantage to be gained by advising functions when their original source definitions can be freely rewritten to include the desired features. Advice is only useful in that it enables
128:, lies in the fact that not only do the advised functions / methods not need to be designed to accept advice, but also the advice themselves need not be designed to be usable as advice - they're just normal functions. The availability of
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Advice has the potential to introduce confusion, as a piece of advice applied to a function is not apparent to a user who tracks down the function's source definition to learn about it. In such cases, advice acts almost like a
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The principal advantage of advising is that the user need not be concerned about the details of the actual changes in his program, nor the internal representation of advice. He can treat the procedure to be advised
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85:(the user's version is now out of sync with the core Emacs implementation, if it even works without further refactoring). What the user wants is quite simple — just to run another command any time
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Common Lisp implementations provide advice functionality (in addition to the standard method combination for CLOS) as extensions. LispWorks supports advising functions, macros and CLOS methods.
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Since method combination and macros are closely related, it's also interesting to note that the first macro system was described in 1963, three years before Warren
Teitelman's PhD thesis.
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automatically into any other code in a variety of ways. Any piece of code can be advised to carry out any other computation before, after, around, or instead of its original definition.
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The practical use of advice functions is generally to modify or otherwise extend the behavior of functions which cannot or should not be readily modified or extended. For instance, the
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users to subsequently modify default behaviour in a way that does not require propagation of such modifications into the core implementation's source definition.
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which modify other functions when the latter are run; it is a certain function, method or procedure that is to be applied at a given
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defined in a class, which were called before (respectively, after) member functions of the class. However, these were dropped from
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While this example is obviously trivial, the strength of advice, especially when compared to similar facilities such as
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https://web.archive.org/web/20060913001624/http://www.ai.mit.edu/research/publications/browse/0000browse.shtml
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https://web.archive.org/web/20060913001624/http://www.ai.mit.edu/research/publications/browse/0600browse.shtml
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offers no such functionality, even if the corrected word appears frequently in the buffer. The user
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Method combination and macros were only marginally related until much later, in New
Flavors and
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For a simple Emacs example: suppose after a user corrected a mis-spelled word using the Emacs
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methods, which are combined with the primary method under "standard method combination".
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in his PhD thesis in 1966. Here is a quote from
Chapter 3 of his thesis:
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Teitelman's PhD thesis, PILOT: A Step Toward Man-Computer
Symbiosis
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LispWorks 7 User Guide and
Reference Manual, The Advice Facility
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165:. In practice, however, such issues rarely present themselves.
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The following is taken from a discussion at the mailing list
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in the late 1970s and early 1980s, namely functions called
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module, they wanted to re-spellcheck the entire buffer.
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runs. Using advice, it can be done as simply as this:
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333:Aspect-oriented software development#Advice bodies
132:throughout the lifetime of a piece of code (cf.
223:EmacsLisp added advice-related code in version
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246:The term "advice" goes back to the term
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18:Advice in aspect-oriented programming
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161:attendant to the extensive use of
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403:The Design and Evolution of C++,
357:Advice appeared separately from
346:comments the above as follows:
182:A form of advices were part of
279:"Advising" found its way into
136:) in Lisp allows advice to be
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450:See, for example, AIM-602 at
77:track down the definition of
632:Lisp (programming language)
627:Aspect-oriented programming
551:Aspect-oriented programming
527:Aspect-oriented programming
243:contributed the following:
153:, a joke facility added to
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485:Interlisp reference manual
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294:It also found its way to
203:Common Lisp Object System
201:Advices are part of the
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416:"A Brief Guide to CLOS"
637:Programming constructs
561:Cross-cutting concerns
33:functional programming
39:describes a class of
491:"Origin of Advice"
323:Function decorator
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250:as introduced by
159:spaghettification
122:Python decorators
16:(Redirected from
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418:. Archived from
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424:. Retrieved
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205:(CLOS), as
144:Readability
103:ispell-word
87:ispell-word
79:ispell-word
71:ispell-word
621:Categories
566:Join point
481:(AITR-221)
426:2015-04-27
390:References
285:Xerox PARC
172:downstream
130:evaluation
97:advice-add
45:join point
596:AspectC++
589:Languages
487:from 1974
289:Interlisp
273:as a unit
259:"advice".
57:Emacspeak
41:functions
571:Pointcut
534:Concepts
365:and the
325:(w.r.t.
317:See also
281:BBN Lisp
248:advising
227:, 1994.
167:Upstream
155:INTERCAL
151:COMEFROM
601:AspectJ
363:Maclisp
359:Flavors
296:Flavors
231:History
215::around
207::before
138:inlined
83:brittle
546:Aspect
541:Advice
327:Python
213:, and
211::after
192:return
109:#'
106::after
100:#'
67:ispell
37:advice
29:aspect
405:p. 57
339:Notes
225:19.28
163:GOTOs
75:could
60:Emacs
380:CLOS
304:Lisp
190:and
188:call
124:and
31:and
361:in
308:MIT
287:'s
196:C++
51:Use
35:,
27:In
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512:t
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