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1 ;;; tl-seq.el --- sequence functions
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2
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3 ;; Copyright (C) 1995,1996 Free Software Foundation, Inc.
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Version:
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7 ;; $Id: tl-seq.el,v 1.1.1.1 1996/12/18 03:55:31 steve Exp $
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8 ;; Keywords: sequence
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9
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10 ;; This file is part of tl (Tiny Library).
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11
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12 ;; This program is free software; you can redistribute it and/or
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13 ;; modify it under the terms of the GNU General Public License as
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14 ;; published by the Free Software Foundation; either version 2, or (at
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15 ;; your option) any later version.
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16
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17 ;; This program is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with This program; see the file COPYING. If not, write to
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24 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Code:
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28
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29 (require 'file-detect)
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30
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31 (cond ((file-installed-p "cl-seq.elc")
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32 (require 'cl)
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33 )
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34 (t
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35 (defun find-if (pred seq)
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36 "Return the first element of sequence SEQ satisfying PRED.
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37 \[tl-seq.el]"
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38 (let ((i 0)(len (length seq)) element)
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39 (catch 'tag
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40 (while (< i len)
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41 (if (funcall pred (setq element (elt seq i)))
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42 (throw 'tag element)
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43 )
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44 (setq i (+ i 1))
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45 ))
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46 ))
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47
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48 (defun find (item seq)
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49 "Return the first element which is found in sequence SEQ as item.
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50 \[tl-seq.el]"
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51 (find-if (function
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52 (lambda (elt)
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53 (eq elt item)
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54 ))
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55 seq))
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56 ))
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57
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58 (defun foldr (func a seq)
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59 "Return (func (func (func (... (func a Sn) ...) S2) S1) S0)
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60 when func's argument is 2 and seq is a sequence whose
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61 elements = S0 S1 S2 ... Sn. [tl-seq.el]"
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62 (let ((i (length seq)))
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63 (while (> i 0)
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64 (setq i (1- i))
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65 (setq a (funcall func a (elt seq i)))
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66 )
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67 a))
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68
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69 (defun foldl (func a seq)
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70 "Return (... (func (func (func a S0) S1) S2) ...)
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71 when func's argument is 2 and seq is a sequence whose
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72 elements = S0 S1 S2 .... [tl-seq.el]"
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73 (let ((len (length seq))
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74 (i 0))
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75 (while (< i len)
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76 (setq a (funcall func a (elt seq i)))
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77 (setq i (1+ i))
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78 )
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79 a))
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80
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81 (defun pack-sequence (seq size)
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82 (let ((len (length seq)) (p 0) obj
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83 unit (i 0)
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84 dest)
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85 (while (< p len)
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86 (setq obj (elt seq p))
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87 (setq unit (cons obj unit))
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88 (setq i (1+ i))
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89 (if (= i size)
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90 (progn
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91 (setq dest (cons (reverse unit) dest))
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92 (setq unit nil)
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93 (setq i 0)
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94 ))
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95 (setq p (1+ p))
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96 )
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97 (if unit
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98 (setq dest (cons (reverse unit) dest))
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99 )
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100 (reverse dest)
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101 ))
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102
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103
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104 ;;; @ end
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105 ;;;
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106
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107 (provide 'tl-seq)
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108
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109 ;;; tl-seq.el ends here
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