1 | ;;; subtypep.lisp |
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2 | ;;; |
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3 | ;;; Copyright (C) 2003 Peter Graves |
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4 | ;;; $Id: subtypep.lisp,v 1.9 2003-09-19 15:14:56 piso Exp $ |
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5 | ;;; |
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6 | ;;; This program is free software; you can redistribute it and/or |
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7 | ;;; modify it under the terms of the GNU General Public License |
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8 | ;;; as published by the Free Software Foundation; either version 2 |
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9 | ;;; of the License, or (at your option) any later version. |
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10 | ;;; |
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11 | ;;; This program is distributed in the hope that it will be useful, |
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12 | ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | ;;; GNU General Public License for more details. |
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15 | ;;; |
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16 | ;;; You should have received a copy of the GNU General Public License |
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17 | ;;; along with this program; if not, write to the Free Software |
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18 | ;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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19 | |
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20 | ;;; Adapted from GCL. |
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21 | |
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22 | (in-package "SYSTEM") |
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23 | |
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24 | (defparameter *known-types* (make-hash-table)) |
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25 | |
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26 | (dolist (i '((ARITHMETIC-ERROR ERROR) |
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27 | (ARRAY) |
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28 | (BASE-STRING SIMPLE-STRING) |
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29 | (BIGNUM INTEGER) |
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30 | (BIT INTEGER) |
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31 | (BIT-VECTOR VECTOR) |
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32 | (BOOLEAN SYMBOL) |
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33 | (BUILT-IN-CLASS STANDARD-CLASS) |
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34 | (CELL-ERROR ERROR) |
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35 | (CHARACTER) |
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36 | (CLASS STANDARD-OBJECT) |
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37 | (COMPILED-FUNCTION FUNCTION) |
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38 | (COMPLEX NUMBER) |
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39 | (CONDITION) |
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40 | (CONS LIST) |
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41 | (CONTROL-ERROR ERROR) |
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42 | (DIVISION-BY-ZERO ARITHMETIC-ERROR) |
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43 | (END-OF-FILE STREAM-ERROR) |
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44 | (ERROR SERIOUS-CONDITION) |
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45 | (EXTENDED-CHAR CHARACTER NIL) |
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46 | (FILE-ERROR ERROR) |
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47 | (FIXNUM INTEGER) |
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48 | (FLOAT REAL) |
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49 | (FLOATING-POINT-INEXACT ARITHMETIC-ERROR) |
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50 | (FLOATING-POINT-INVALID-OPERATION ARITHMETIC-ERROR) |
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51 | (FLOATING-POINT-OVERFLOW ARITHMETIC-ERROR) |
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52 | (FLOATING-POINT-UNDERFLOW ARITHMETIC-ERROR) |
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53 | (FUNCTION) |
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54 | (GENERIC-FUNCTION FUNCTION) |
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55 | (HASH-TABLE) |
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56 | (INTEGER RATIONAL) |
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57 | (KEYWORD SYMBOL) |
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58 | (LIST SEQUENCE) |
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59 | (NULL SYMBOL LIST) |
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60 | (NUMBER) |
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61 | (PACKAGE) |
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62 | (PACKAGE-ERROR ERROR) |
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63 | (PARSE-ERROR ERROR) |
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64 | (PATHNAME) |
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65 | (PRINT-NOT-READABLE ERROR) |
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66 | (PROGRAM-ERROR ERROR) |
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67 | (RANDOM-STATE) |
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68 | (RATIO RATIONAL) |
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69 | (RATIONAL REAL) |
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70 | (READER-ERROR PARSE-ERROR STREAM-ERROR) |
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71 | (READTABLE) |
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72 | (REAL NUMBER) |
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73 | (RESTART) |
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74 | (SERIOUS-CONDITION CONDITION) |
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75 | (SIMPLE-ARRAY ARRAY) |
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76 | (SIMPLE-BASE-STRING SIMPLE-STRING BASE-STRING) |
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77 | (SIMPLE-BIT-VECTOR BIT-VECTOR SIMPLE-ARRAY) |
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78 | (SIMPLE-CONDITION CONDITION) |
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79 | (SIMPLE-ERROR SIMPLE-CONDITION ERROR) |
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80 | (SIMPLE-STRING STRING SIMPLE-ARRAY) |
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81 | (SIMPLE-TYPE-ERROR SIMPLE-CONDITION TYPE-ERROR) |
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82 | (SIMPLE-VECTOR VECTOR SIMPLE-ARRAY) |
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83 | (SIMPLE-WARNING SIMPLE-CONDITION WARNING) |
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84 | (STANDARD-CHAR CHARACTER) |
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85 | (STANDARD-CLASS CLASS) |
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86 | (STANDARD-GENERIC-FUNCTION GENERIC-FUNCTION) |
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87 | (STANDARD-OBJECT) |
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88 | (STORAGE-CONDITION SERIOUS-CONDITION) |
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89 | (STREAM) |
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90 | (STREAM-ERROR ERROR) |
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91 | (STRING VECTOR) |
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92 | (STRUCTURE-CLASS CLASS STANDARD-OBJECT) |
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93 | (STYLE-WARNING WARNING) |
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94 | (SYMBOL) |
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95 | (TWO-WAY-STREAM STREAM) |
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96 | (TYPE-ERROR ERROR) |
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97 | (UNBOUND-SLOT CELL-ERROR) |
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98 | (UNBOUND-VARIABLE CELL-ERROR) |
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99 | (UNDEFINED-FUNCTION CELL-ERROR) |
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100 | (VECTOR ARRAY SEQUENCE) |
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101 | (WARNING CONDITION) |
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102 | )) |
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103 | (setf (gethash (car i) *known-types*) (cdr i))) |
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104 | |
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105 | (defun supertypes (type) |
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106 | (values (gethash type *known-types*))) |
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107 | |
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108 | (defun known-type-p (type) |
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109 | (multiple-value-bind (value present-p) (gethash type *known-types*) |
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110 | present-p)) |
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111 | |
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112 | (defun normalize-type (type) |
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113 | (let (tp i) |
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114 | (if (consp type) |
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115 | (setq tp (car type) i (cdr type)) |
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116 | (setq tp type i nil)) |
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117 | (case tp |
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118 | ((ARRAY SIMPLE-ARRAY) |
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119 | (when (and i (eq (car i) nil)) |
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120 | (if (eq tp 'simple-array) |
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121 | (setq tp 'simple-string) |
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122 | (setq tp 'string)) |
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123 | (when (cadr i) |
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124 | (if (consp (cadr i)) |
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125 | (setq i (cadr i)) |
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126 | (setq i (list (cadr i))))))) |
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127 | (BASE-CHAR |
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128 | (setq tp 'character)) |
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129 | (FIXNUM |
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130 | (setq tp 'integer i '(#.most-negative-fixnum #.most-positive-fixnum))) |
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131 | ((SHORT-FLOAT SINGLE-FLOAT DOUBLE-FLOAT LONG-FLOAT) |
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132 | (setq tp 'float))) |
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133 | (cons tp i))) |
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134 | |
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135 | (defun simple-subtypep (type1 type2) |
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136 | (assert (symbolp type1)) |
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137 | (assert (symbolp type2)) |
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138 | (if (memq type2 (supertypes type1)) |
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139 | t |
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140 | (dolist (supertype (supertypes type1)) |
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141 | (when (simple-subtypep supertype type2) |
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142 | (return t))))) |
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143 | |
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144 | (defun sub-interval-p (i1 i2) |
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145 | (let (low1 high1 low2 high2) |
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146 | (if (null i1) |
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147 | (setq low1 '* high1 '*) |
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148 | (if (null (cdr i1)) |
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149 | (setq low1 (car i1) high1 '*) |
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150 | (setq low1 (car i1) high1 (cadr i1)))) |
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151 | (if (null i2) |
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152 | (setq low2 '* high2 '*) |
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153 | (if (null (cdr i2)) |
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154 | (setq low2 (car i2) high2 '*) |
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155 | (setq low2 (car i2) high2 (cadr i2)))) |
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156 | (when (and (consp low1) (integerp (car low1))) |
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157 | (setq low1 (1+ (car low1)))) |
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158 | (when (and (consp low2) (integerp (car low2))) |
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159 | (setq low2 (1+ (car low2)))) |
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160 | (when (and (consp high1) (integerp (car high1))) |
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161 | (setq high1 (1- (car high1)))) |
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162 | (when (and (consp high2) (integerp (car high2))) |
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163 | (setq high2 (1- (car high2)))) |
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164 | (cond ((eq low1 '*) |
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165 | (unless (eq low2 '*) |
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166 | (return-from sub-interval-p nil))) |
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167 | ((eq low2 '*)) |
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168 | ((consp low1) |
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169 | (if (consp low2) |
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170 | (when (< (car low1) (car low2)) |
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171 | (return-from sub-interval-p nil)) |
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172 | (when (< (car low1) low2) |
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173 | (return-from sub-interval-p nil)))) |
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174 | ((if (consp low2) |
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175 | (when (<= low1 (car low2)) |
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176 | (return-from sub-interval-p nil)) |
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177 | (when (< low1 low2) |
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178 | (return-from sub-interval-p nil))))) |
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179 | (cond ((eq high1 '*) |
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180 | (unless (eq high2 '*) |
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181 | (return-from sub-interval-p nil))) |
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182 | ((eq high2 '*)) |
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183 | ((consp high1) |
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184 | (if (consp high2) |
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185 | (when (> (car high1) (car high2)) |
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186 | (return-from sub-interval-p nil)) |
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187 | (when (> (car high1) high2) |
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188 | (return-from sub-interval-p nil)))) |
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189 | ((if (consp high2) |
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190 | (when (>= high1 (car high2)) |
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191 | (return-from sub-interval-p nil)) |
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192 | (when (> high1 high2) |
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193 | (return-from sub-interval-p nil))))) |
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194 | (return-from sub-interval-p t))) |
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195 | |
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196 | (defun subtypep (type1 type2) |
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197 | (when (or (null type1) (eq type2 t)) |
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198 | (return-from subtypep (values t t))) |
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199 | (setq type1 (normalize-type type1) |
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200 | type2 (normalize-type type2)) |
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201 | (when (equal type1 type2) |
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202 | (return-from subtypep (values t t))) |
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203 | (let ((t1 (car type1)) |
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204 | (t2 (car type2)) |
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205 | (i1 (cdr type1)) |
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206 | (i2 (cdr type2))) |
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207 | (when (eq t2 'atom) |
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208 | (return-from subtypep (cond ((memq t1 '(cons list)) (values nil t)) |
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209 | ((known-type-p t1) (values t t)) |
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210 | (t (values nil nil))))) |
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211 | (unless (or i1 i2) |
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212 | (return-from subtypep (values (simple-subtypep t1 t2) t))) |
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213 | (cond ((eq t2 'sequence) |
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214 | (values (simple-subtypep t2 t2) t)) |
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215 | ((eq t2 'simple-string) |
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216 | (if (memq t1 '(simple-string simple-base-string)) |
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217 | (if (or (null i2) (eq (car i2) '*)) |
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218 | (values t t) |
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219 | (values nil t)) |
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220 | (values nil (known-type-p t2)))) |
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221 | (t |
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222 | (cond ((eq t1 'float) |
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223 | (if (memq t2 '(float real number)) |
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224 | (values (sub-interval-p i1 i2) t) |
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225 | (values nil (known-type-p t2)))) |
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226 | ((eq t1 'integer) |
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227 | (if (memq t2 '(integer rational real number)) |
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228 | (values (sub-interval-p i1 i2) t) |
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229 | (values nil (known-type-p t2)))) |
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230 | ((eq t1 'rational) |
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231 | (if (memq t2 '(rational real number)) |
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232 | (values (sub-interval-p i1 i2) t) |
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233 | (values nil (known-type-p t2)))) |
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234 | ((eq t1 'real) |
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235 | (if (memq t2 '(real number)) |
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236 | (values (sub-interval-p i1 i2) t) |
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237 | (values nil (known-type-p t2)))) |
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238 | ((memq t1 '(string simple-string base-string |
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239 | simple-base-string)) |
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240 | (cond ((eq t2 'string) |
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241 | (if (or (null i2) (eq (car i2) '*)) |
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242 | (values t t) |
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243 | (values nil t))) |
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244 | (t |
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245 | (values nil (known-type-p t2))))) |
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246 | (t |
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247 | (values nil nil))))))) |
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