1 | ; Author: Juergen Lorenz ; ju (at) jugilo (dot) de |
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2 | ; |
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3 | ; Copyright (c) 2016-2018, Juergen Lorenz |
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4 | ; All rights reserved. |
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5 | ; |
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6 | ; Redistribution and use in source and binary forms, with or without |
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7 | ; modification, are permitted provided that the following conditions are |
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8 | ; met: |
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9 | ; |
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10 | ; Redistributions of source code must retain the above copyright |
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11 | ; notice, this list of conditions and the following dispasser. |
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12 | ; |
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13 | ; Redistributions in binary form must reproduce the above copyright |
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14 | ; notice, this list of conditions and the following dispasser in the |
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15 | ; documentation and/or other materials provided with the distribution. |
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16 | ; |
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17 | ; Neither the name of the author nor the names of its contributors may be |
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18 | ; used to endorse or promote products derived from this software without |
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19 | ; specific prior written permission. |
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20 | ; |
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21 | ; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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22 | ; IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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23 | ; TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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24 | ; PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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25 | ; HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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26 | ; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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27 | ; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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28 | ; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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29 | ; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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30 | ; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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31 | ; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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32 | |
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33 | |
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34 | #|[ |
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35 | Besides the documentation procedure, this module exports two curry |
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36 | procedure, @> and @<, one macro, @@, and a sharp-read-macro, ##, which |
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37 | abbreviates the call of that latter macro. |
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38 | |
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39 | The macro transforms expressions with zero or more holes into a |
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40 | procedure. Insofar, it's a bit like cut or cute. But while in cut or |
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41 | cute a hole is the special identifier <>, in this module it's a pair of |
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42 | bangs, possibly enclosing a sequence of digits, for examples !! or !1!. |
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43 | In this way, holes needn't name different variables like in cut or cute. |
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44 | |
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45 | Another difference to cut or cute is, that the holes may appear in |
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46 | nested expressions at different levels. This gives great flexibility. |
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47 | And the sharp-read-syntax ## adds ease of use. |
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48 | ]|# |
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49 | |
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50 | (module holes (holes @@ @> @<) |
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51 | (import scheme |
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52 | (only (chicken base) error case-lambda print make-parameter) |
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53 | (only (chicken syntax) define-for-syntax) |
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54 | (only (chicken read-syntax) |
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55 | set-sharp-read-syntax! |
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56 | set-read-syntax!)) |
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57 | (import-for-syntax (only (chicken base) receive) |
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58 | (only (chicken fixnum) fx- fx+ fx=)) |
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59 | |
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60 | (define-for-syntax hole-delimiters |
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61 | (make-parameter "<>" |
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62 | (lambda (arg) |
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63 | (if (and (string? arg) |
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64 | (or (string=? arg "!!") |
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65 | (string=? arg "<>"))) |
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66 | arg |
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67 | "<>")) |
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68 | )) |
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69 | ;;; (@@ code) |
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70 | ;;; --------- |
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71 | ;;; returns a procedure with arguments the holes in code |
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72 | (define-syntax @@ |
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73 | (er-macro-transformer |
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74 | (lambda (form rename compare?) |
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75 | (let ( |
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76 | (code (cadr form)) |
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77 | (%lambda (rename 'lambda)) |
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78 | (flatten* |
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79 | ; imported flatten doesn't work with pseudo-lists |
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80 | (lambda (tree) |
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81 | (let loop ((tree tree) (result '())) |
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82 | (cond |
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83 | ((pair? tree) |
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84 | (loop (car tree) (loop (cdr tree) result))) |
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85 | ((null? tree) result) |
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86 | (else |
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87 | (cons tree result)))))) |
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88 | (hole? |
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89 | (lambda (sym) |
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90 | (and (symbol? sym) |
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91 | (let* ((lst (string->list (symbol->string sym))) |
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92 | (len (length lst)) |
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93 | (target (string->list "0123456789"))) |
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94 | (and (char=? (car lst) |
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95 | (string-ref (hole-delimiters) 0)) |
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96 | (char=? (list-ref lst (fx- len 1)) |
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97 | (string-ref (hole-delimiters) 1)) |
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98 | (let loop ((k 1) (result #t)) |
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99 | (call/cc |
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100 | (lambda (out) |
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101 | (if (fx= k (fx- len 1)) |
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102 | result |
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103 | (loop (fx+ k 1) |
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104 | (if (memq (list-ref lst k) |
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105 | target) |
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106 | result |
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107 | (out #f)))))))))))) |
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108 | (filter |
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109 | (lambda (ok? lst) |
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110 | (compress (map ok? lst) lst))) |
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111 | (ninsert |
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112 | (lambda (n lon) |
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113 | (let loop ((lon lon)) |
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114 | (cond |
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115 | ((null? lon) (list n)) |
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116 | ((= n (car lon)) lon) |
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117 | ((< n (car lon)) (cons n lon)) |
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118 | ((> n (car lon)) |
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119 | (cons (car lon) (loop (cdr lon)))))))) |
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120 | (split-with |
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121 | (lambda (where? lst) |
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122 | (let loop ((tail lst) (head '())) |
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123 | (if (or (null? tail) (where? (car tail))) |
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124 | (values (reverse head) tail) |
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125 | (loop (cdr tail) (cons (car tail) head)))))) |
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126 | (no-dups? |
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127 | (lambda (lst) |
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128 | (let loop ((lst lst) (result '())) |
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129 | (cond |
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130 | ((null? lst) #t) |
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131 | ((memq (car lst) result) #f) |
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132 | (else (loop (cdr lst) |
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133 | (cons (car lst) result))))))) |
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134 | ) |
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135 | (let* ( |
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136 | (nsort |
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137 | (lambda (lon) |
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138 | (let loop ((lon lon) (result '())) |
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139 | (if (null? lon) |
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140 | result |
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141 | (loop (cdr lon) (ninsert (car lon) result)))))) |
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142 | (hsort |
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143 | (lambda (holes) |
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144 | (let* ( |
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145 | (strings (map symbol->string holes)) |
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146 | (substrings |
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147 | (map (lambda (s) |
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148 | (substring s 1 (fx- (string-length s) 1))) |
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149 | strings)) |
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150 | (nums (map string->number |
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151 | (filter (lambda (s) |
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152 | (not (string=? s ""))) |
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153 | substrings))) |
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154 | (snums (nsort nums)) |
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155 | (sstrings |
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156 | (map (lambda (s) |
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157 | (string-append (substring (hole-delimiters) 0 1) |
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158 | s |
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159 | (substring (hole-delimiters) 1))) |
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160 | (map number->string snums))) |
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161 | (sholes (map string->symbol sstrings)) |
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162 | ) |
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163 | (if (memq (string->symbol (hole-delimiters)) holes) |
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164 | (cons (string->symbol (hole-delimiters)) sholes) |
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165 | sholes)))) |
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166 | ) |
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167 | `(,%lambda |
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168 | ,(hsort (filter hole? (flatten* code))) |
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169 | ,code)))))) |
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170 | |
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171 | (set-sharp-read-syntax! #\# |
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172 | (lambda (port) `(@@ ,(read port)))) |
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173 | (set-read-syntax! #\^ |
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174 | (lambda (port) `(@@ ,(read port)))) |
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175 | |
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176 | ;;; (@> proc . head) |
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177 | ;;; ---------------- |
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178 | ;;; returns a curried procedure with arguments tail, which applies proc to |
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179 | ;;; (append head tail) |
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180 | (define (@> proc . head) |
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181 | (lambda tail |
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182 | (apply proc (append head tail)))) |
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183 | |
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184 | |
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185 | ;;; (@< proc . tail) |
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186 | ;;; ---------------- |
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187 | ;;; returns a curried procedure with arguments head, which applies proc to |
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188 | ;;; (append head tail) |
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189 | (define (@< proc . tail) |
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190 | (lambda head |
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191 | (apply proc (append head tail)))) |
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192 | |
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193 | ;;; (holes [sym]) |
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194 | ;;; ------------- |
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195 | ;;; documentation procderue |
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196 | (define holes |
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197 | (let ((als '( |
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198 | (holes |
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199 | procedure: |
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200 | (holes sym ..) |
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201 | "documentation procedure") |
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202 | (hole-delimiters |
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203 | parameter: |
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204 | (hole-delimiters str ..) |
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205 | "returns or sets the delimiters" |
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206 | "accepted strings are \"<>\" and \"!!\"" |
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207 | "\"<>\" is the default") |
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208 | (@@ |
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209 | macro: |
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210 | (@@ code) |
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211 | "extracts holes, i.e. a pair of bangs" |
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212 | "or the pair <> depending on the parameter" |
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213 | "hole-delimiters" |
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214 | "possible enclosing a seqence of digits" |
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215 | "from code, sorts them numerically while" |
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216 | "removing duplicates, and uses" |
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217 | "the resulting list as argument list of" |
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218 | "a procedure with body code." |
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219 | "" |
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220 | "Can be called with sharp-read-syntax ##" |
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221 | "or read-syntax ^" |
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222 | "Note, that (@@ code), and hence ##code," |
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223 | "or ^code is always a procedure!") |
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224 | (@> |
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225 | procedure: |
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226 | (@> proc . head) |
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227 | "returns a curried procedure with arguments tail" |
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228 | "which applies proc to (append head tail)") |
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229 | (@< |
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230 | procedure: |
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231 | (@< proc . tail) |
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232 | "returns a curried procedure with arguments head" |
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233 | "which applies proc to (append head tail)") |
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234 | ))) |
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235 | (case-lambda |
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236 | (() |
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237 | (map car als)) |
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238 | ((sym) |
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239 | (let ((pair (assq sym als))) |
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240 | (if pair |
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241 | (for-each print (cdr pair)) |
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242 | (error "Not in list" |
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243 | sym |
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244 | (map car als)))))))) |
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245 | |
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246 | ) ; module holes |
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247 | |
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