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author | James LewisMoss <dres@debian.org> | 2001-07-27 23:45:29 -0400 |
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committer | Bryan Newbold <bnewbold@robocracy.org> | 2017-02-20 00:05:29 -0800 |
commit | f559c149c83da84d0b1c285f0298c84aec564af9 (patch) | |
tree | f1c91bcb9bb5e6dad87b643127c3f878d80d89ee /coerce.scm | |
parent | c394920caedf3dac1981bb6b10eeb47fd6e4bb21 (diff) | |
parent | 87b82b5822ca54228cfa6df29be3ad9d4bc47d16 (diff) | |
download | slib-f559c149c83da84d0b1c285f0298c84aec564af9.tar.gz slib-f559c149c83da84d0b1c285f0298c84aec564af9.zip |
Import Debian changes 2d2-1debian/2d2-1
slib (2d2-1) unstable; urgency=low
* New upstream version
* Revert back to free. Is now so.
slib (2d1-1) unstable; urgency=low
* New upstream version.
* Move to non-free. FSF pointed out license doesn't allow modified
versions to be distributed.
* Get a complete list of copyrights that apply to the source into
copyright file.
* Remove setup for guile 1.3.
* Remove postrm. Just calling install-info (lintian) Move install-info
call to prerm since doc-base doesn't do install-info.
slib (2c9-3) unstable; urgency=low
* Change info location to section "The Algorithmic Language Scheme" to
match up with where guile puts it's files.
* Postinst is running slibconfig now. (Closes: #75891)
slib (2c9-2) unstable; urgency=low
* Stop installing slibconfig (for guile).
* In postinst if /usr/sbin/slibconnfig exists call it (Close: #75843
#75891).
slib (2c9-1) unstable; urgency=low
* New upstream (Closes: #74760)
* replace string-index with strsrch:string-index in http-cgi.scm.
* Add doc-base support (Closes: #31163)
Diffstat (limited to 'coerce.scm')
-rw-r--r-- | coerce.scm | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/coerce.scm b/coerce.scm new file mode 100644 index 0000000..83023df --- /dev/null +++ b/coerce.scm @@ -0,0 +1,107 @@ +;;"coerce.scm" Scheme Implementation of COMMON-LISP COERCE and TYPE-OF. +; Copyright (C) 1995, 2001 Aubrey Jaffer +; +;Permission to copy this software, to modify it, to redistribute it, +;to distribute modified versions, and to use it for any purpose is +;granted, subject to the following restrictions and understandings. +; +;1. Any copy made of this software must include this copyright notice +;in full. +; +;2. I have made no warrantee or representation that the operation of +;this software will be error-free, and I am under no obligation to +;provide any services, by way of maintenance, update, or otherwise. +; +;3. In conjunction with products arising from the use of this +;material, there shall be no use of my name in any advertising, +;promotional, or sales literature without prior written consent in +;each case. + +;;@body +;;Returns a symbol name for the type of @1. +(define (type-of obj) + (cond + ;;((null? obj) 'null) + ((boolean? obj) 'boolean) + ((char? obj) 'char) + ((number? obj) 'number) + ((string? obj) 'string) + ((symbol? obj) 'symbol) + ((input-port? obj) 'port) + ((output-port? obj) 'port) + ((procedure? obj) 'procedure) + ((eof-object? obj) 'eof-object) + ((list? obj) 'list) + ((pair? obj) 'pair) + ((and (provided? 'array) (array? obj)) 'array) + ((and (provided? 'record) (record? obj)) 'record) + ((vector? obj) 'vector) + (else '?))) + +;;@body +;;Converts and returns @1 of type @code{char}, @code{number}, +;;@code{string}, @code{symbol}, @code{list}, or @code{vector} to +;;@2 (which must be one of these symbols). +(define (coerce obj result-type) + (define (err) (slib:error 'coerce 'not obj '-> result-type)) + (define obj-type (type-of obj)) + (cond + ((eq? obj-type result-type) obj) + (else + (case obj-type + ((char) (case result-type + ((number integer) (char->integer obj)) + ((string) (string obj)) + ((symbol) (string->symbol (string obj))) + ((list) (list obj)) + ((vector) (vector obj)) + (else (err)))) + ((number) (case result-type + ((char) (integer->char obj)) + ((atom) obj) + ((integer) obj) + ((string) (number->string obj)) + ((symbol) (string->symbol (number->string obj))) + ((list) (string->list (number->string obj))) + ((vector) (list->vector (string->list (number->string obj)))) + (else (err)))) + ((string) (case result-type + ((char) (if (= 1 (string-length obj)) (string-ref obj 0) + (err))) + ((atom) (or (string->number obj) (string->symbol obj))) + ((number integer) (or (string->number obj) (err))) + ((symbol) (string->symbol obj)) + ((list) (string->list obj)) + ((vector) (list->vector (string->list obj))) + (else (err)))) + ((symbol) (case result-type + ((char) (coerce (symbol->string obj) 'char)) + ((number integer) (coerce (symbol->string obj) 'number)) + ((string) (symbol->string obj)) + ((atom) obj) + ((list) (string->list (symbol->string obj))) + ((vector) (list->vector (string->list (symbol->string obj)))) + (else (err)))) + ((list) (case result-type + ((char) (if (and (= 1 (length obj)) + (char? (car obj))) + (car obj) + (err))) + ((number integer) + (or (string->number (list->string obj)) (err))) + ((string) (list->string obj)) + ((symbol) (string->symbol (list->string obj))) + ((vector) (list->vector obj)) + (else (err)))) + ((vector) (case result-type + ((char) (if (and (= 1 (vector-length obj)) + (char? (vector-ref obj 0))) + (vector-ref obj 0) + (err))) + ((number integer) + (or (string->number (coerce obj string)) (err))) + ((string) (list->string (vector->list obj))) + ((symbol) (string->symbol (coerce obj string))) + ((list) (list->vector obj)) + (else (err)))) + (else (err)))))) |