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Diffstat (limited to 'third_party/lisp/mime4cl/ex-sclf.lisp')
| -rw-r--r-- | third_party/lisp/mime4cl/ex-sclf.lisp | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/third_party/lisp/mime4cl/ex-sclf.lisp b/third_party/lisp/mime4cl/ex-sclf.lisp new file mode 100644 index 0000000000..1719732fb3 --- /dev/null +++ b/third_party/lisp/mime4cl/ex-sclf.lisp @@ -0,0 +1,329 @@ +;;; ex-sclf.lisp --- subset of sclf used by mime4cl + +;;; Copyright (C) 2005-2010 by Walter C. Pelissero +;;; Copyright (C) 2022-2023 The TVL Authors + +;;; Author: sternenseemann <sternenseemann@systemli.org> +;;; Project: mime4cl +;;; +;;; mime4cl uses sclf for miscellaneous utility functions. sclf's portability +;;; is quite limited. Since mime4cl is the only thing in TVL's depot depending +;;; on sclf, it made more sense to strip down sclf to the extent mime4cl needed +;;; in order to lessen the burden of porting it to other CL implementations +;;; later. +;;; +;;; Eventually it probably makes sense to drop the utilities we don't like and +;;; merge the ones we do like into depot's own utility package, klatre. + +#+cmu (ext:file-comment "$Module: ex-sclf.lisp $") + +;;; This library is free software; you can redistribute it and/or +;;; modify it under the terms of the GNU Lesser General Public License +;;; as published by the Free Software Foundation; either version 2.1 +;;; of the License, or (at your option) any later version. +;;; This library is distributed in the hope that it will be useful, +;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;; Lesser General Public License for more details. +;;; You should have received a copy of the GNU Lesser General Public +;;; License along with this library; if not, write to the Free +;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA +;;; 02111-1307 USA + +(defpackage :mime4cl-ex-sclf + (:use :common-lisp) + (:import-from :sb-posix :stat :stat-size) + + (:export + #:aif + #:awhen + #:aand + #:it + + #:gcase + + #:with-gensyms + + #:split-at + #:split-string-at-char + #:+whitespace+ + #:whitespace-p + #:string-concat + #:s+ + #:string-starts-with + #:string-trim-whitespace + #:string-left-trim-whitespace + #:string-right-trim-whitespace + + #:queue + #:make-queue + #:queue-append + #:queue-pop + #:queue-empty-p + + #:save-file-excursion + #:read-file + + #:file-size + + #:promise + #:make-promise + #:lazy + #:force + #:forced-p + #:deflazy + + #:f++ + + #:week-day->string + #:month->string)) + +(in-package :mime4cl-ex-sclf) + +;; MACRO UTILS + +(defmacro with-gensyms ((&rest symbols) &body body) + "Gensym all SYMBOLS and make them available in BODY. +See also LET-GENSYMS." + `(let ,(mapcar #'(lambda (s) + (list s '(gensym))) symbols) + ,@body)) + +;; CONTROL FLOW + +(defmacro aif (test then &optional else) + `(let ((it ,test)) + (if it + ,then + ,else))) + +(defmacro awhen (test &body then) + `(let ((it ,test)) + (when it + ,@then))) + +(defmacro aand (&rest args) + (cond ((null args) t) + ((null (cdr args)) (car args)) + (t `(aif ,(car args) (aand ,@(cdr args)))))) + +(defmacro gcase ((value &optional (test 'equalp)) &rest cases) + "Generic CASE macro. Match VALUE to CASES as if by the normal CASE +but use TEST as the comparison function, which defaults to EQUALP." + (with-gensyms (val) + `(let ((,val ,value)) + ,(cons 'cond + (mapcar #'(lambda (case-desc) + (destructuring-bind (vals &rest forms) case-desc + `(,(cond ((consp vals) + (cons 'or (mapcar #'(lambda (v) + (list test val v)) + vals))) + ((or (eq vals 'otherwise) + (eq vals t)) + t) + (t (list test val vals))) + ,@forms))) + cases))))) + +;; SEQUENCES + +(defun position-any (bag sequence &rest position-args) + "Find any element of bag in sequence and return its position. +Accept any argument accepted by the POSITION function." + (apply #'position-if #'(lambda (element) + (find element bag)) sequence position-args)) + +(defun split-at (bag sequence &key (start 0) key) + "Split SEQUENCE at occurence of any element from BAG. +Contiguous occurences of elements from BAG are considered atomic; +so no empty sequence is returned." + (let ((len (length sequence))) + (labels ((split-from (start) + (unless (>= start len) + (let ((sep (position-any bag sequence :start start :key key))) + (cond ((not sep) + (list (subseq sequence start))) + ((> sep start) + (cons (subseq sequence start sep) + (split-from (1+ sep)))) + (t + (split-from (1+ start)))))))) + (split-from start)))) + +;; STRINGS + +(defvar +whitespace+ '(#\return #\newline #\tab #\space #\page)) + +(defun whitespace-p (char) + (member char +whitespace+)) + +(defun string-trim-whitespace (string) + (string-trim +whitespace+ string)) + +(defun string-right-trim-whitespace (string) + (string-right-trim +whitespace+ string)) + +(defun string-left-trim-whitespace (string) + (string-left-trim +whitespace+ string)) + +(defun split-string-at-char (string separator &key escape skip-empty) + "Split STRING at SEPARATORs and return a list of the substrings. If +SKIP-EMPTY is true then filter out the empty substrings. If ESCAPE is +not nil then split at SEPARATOR only if it's not preceded by ESCAPE." + (declare (type string string) (type character separator)) + (labels ((next-separator (beg) + (let ((pos (position separator string :start beg))) + (if (and escape + pos + (plusp pos) + (char= escape (char string (1- pos)))) + (next-separator (1+ pos)) + pos))) + (parse (beg) + (cond ((< beg (length string)) + (let* ((end (next-separator beg)) + (substring (subseq string beg end))) + (cond ((and skip-empty (string= "" substring)) + (parse (1+ end))) + ((not end) + (list substring)) + (t + (cons substring (parse (1+ end))))))) + (skip-empty + '()) + (t + (list ""))))) + (parse 0))) + +(defun s+ (&rest strings) + "Return a string which is made of the concatenation of STRINGS." + (apply #'concatenate 'string strings)) + +(defun string-concat (list &optional (separator "")) + "Concatenate the strings in LIST interposing SEPARATOR (default +nothing) between them." + (reduce #'(lambda (&rest args) + (if args + (s+ (car args) separator (cadr args)) + "")) + list)) + +(defun string-starts-with (prefix string &optional (compare #'string=)) + (let ((prefix-length (length prefix))) + (and (>= (length string) prefix-length) + (funcall compare prefix string :end2 prefix-length)))) + +;; QUEUE + +(defstruct queue + first + last) + +(defgeneric queue-append (queue objects)) +(defgeneric queue-pop (queue)) +(defgeneric queue-empty-p (queue)) + +(defmethod queue-append ((queue queue) (objects list)) + (cond ((null (queue-first queue)) + (setf (queue-first queue) objects + (queue-last queue) (last objects))) + (t + (setf (cdr (queue-last queue)) objects + (queue-last queue) (last objects)))) + queue) + +(defmethod queue-append ((queue queue) object) + (queue-append queue (list object))) + +(defmethod queue-pop ((queue queue)) + (prog1 (car (queue-first queue)) + (setf (queue-first queue) (cdr (queue-first queue))))) + +(defmethod queue-empty-p ((queue queue)) + (null (queue-first queue))) + +;; STREAMS + +(defmacro save-file-excursion ((stream &optional position) &body forms) + "Execute FORMS returning, on exit, STREAM to the position it was +before FORMS. Optionally POSITION can be set to the starting offset." + (unless position + (setf position (gensym))) + `(let ((,position (file-position ,stream))) + (unwind-protect (progn ,@forms) + (file-position ,stream ,position)))) + +(defun read-file (pathname &key (element-type 'character) (if-does-not-exist :error) default) + "Read the whole content of file and return it as a sequence which +can be a string, a vector of bytes, or whatever you specify as +ELEMENT-TYPE." + (with-open-file (in pathname + :element-type element-type + :if-does-not-exist (unless (eq :value if-does-not-exist) + :error)) + (if in + (let ((seq (make-array (file-length in) :element-type element-type))) + (read-sequence seq in) + seq) + default))) + +;; FILES + +(defun native-namestring (pathname) + #+sbcl (sb-ext:native-namestring pathname) + #-sbcl (let (#+cmu (lisp::*ignore-wildcards* t)) + (namestring pathname))) + +;; FILE-LENGTH is a bit idiosyncratic in this respect. Besides, Unix +;; allows to get to know the file size without being able to open a +;; file; just ask politely. +(defun file-size (pathname) + #+sbcl (stat-size (unix-stat pathname)) + #-sbcl (error "nyi")) + +;; LAZY + +(defstruct promise + procedure + value) + +(defmacro lazy (form) + `(make-promise :procedure #'(lambda () ,form))) + +(defun forced-p (promise) + (null (promise-procedure promise))) + +(defun force (promise) + (if (forced-p promise) + (promise-value promise) + (prog1 (setf (promise-value promise) + (funcall (promise-procedure promise))) + (setf (promise-procedure promise) nil)))) + +(defmacro deflazy (name value &optional documentation) + `(defparameter ,name (lazy ,value) + ,@(when documentation + (list documentation)))) + +;; FIXNUMS + +(defmacro f++ (x &optional (delta 1)) + "Same as INCF but hopefully optimised for fixnums." + `(setf ,x (+ (the fixnum ,x) (the fixnum ,delta)))) + +;; TIME + +(defun week-day->string (day &optional sunday-first) + "Return the weekday string corresponding to DAY number." + (elt (if sunday-first + #("Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday") + #("Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday" "Sunday")) + day)) + +(defvar +month-names+ #("January" "February" "March" "April" "May" "June" "July" + "August" "September" "October" "November" "December")) + +(defun month->string (month) + "Return the month string corresponding to MONTH number." + (elt +month-names+ (1- month))) |