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398
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1 ;; Copyright (C) 1999 Free Software Foundation, Inc.
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2
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3 ;; Author: Hrvoje Niksic <hniksic@xemacs.org>
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4 ;; Maintainer: Hrvoje Niksic <hniksic@xemacs.org>
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5 ;; Created: 1999
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6 ;; Keywords: tests
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: Not in FSF.
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26
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27 ;;; Commentary:
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28
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29 ;; Test symbols operations.
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30 ;; See test-harness.el for instructions on how to run these tests.
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31
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32 (eval-when-compile
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33 (condition-case nil
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34 (require 'test-harness)
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35 (file-error
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36 (push "." load-path)
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37 (when (and (boundp 'load-file-name) (stringp load-file-name))
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38 (push (file-name-directory load-file-name) load-path))
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39 (require 'test-harness))))
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40
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41
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42 (defun ts-fresh-symbol-name (name)
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43 "Return a variant of NAME (a string) that is not interned."
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44 (when (intern-soft name)
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45 (let ((count 1)
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46 (orig name))
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47 (while (progn
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48 (setq name (format "%s-%d" orig count))
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49 (intern-soft name))
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50 (incf count))))
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51 name)
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52
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53 ;;-----------------------------------------------------
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54 ;; Creating, reading, and printing symbols
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55 ;;-----------------------------------------------------
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56
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57 (dolist (name '("foo" "bar" ""
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58 "something with space in it"
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59 "a string with \0 in the middle."
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60 "100" "10.0" "#<>[]]]];'\\';"
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61 "!@#$%^^&*(()__"))
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62 (let ((interned (intern name))
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63 (uninterned (make-symbol name)))
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64 (Assert (symbolp interned))
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65 (Assert (symbolp uninterned))
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66 (Assert (equal (symbol-name interned) name))
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67 (Assert (equal (symbol-name uninterned) name))
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68 (Assert (not (eq interned uninterned)))
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69 (Assert (not (equal interned uninterned)))))
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70
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71 (flet ((check-weak-list-unique (weak-list &optional reversep)
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72 "Check that elements of WEAK-LIST are referenced only there."
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73 (let ((len (length (weak-list-list weak-list))))
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74 (Assert (not (zerop len)))
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75 (garbage-collect)
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76 (Assert (eq (length (weak-list-list weak-list))
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77 (if (not reversep) 0 len))))))
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78 (let ((weak-list (make-weak-list))
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79 (gc-cons-threshold most-positive-fixnum))
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80 ;; Symbols created with `make-symbol' and `gensym' should be fresh
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81 ;; and not referenced anywhere else. We check that no other
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82 ;; references are available using a weak list.
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83 (eval
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84 ;; This statement must not be run byte-compiled, or the values
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85 ;; remain referenced on the bytecode interpreter stack.
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86 '(set-weak-list-list weak-list (list (make-symbol "foo") (gensym "foo"))))
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87 (check-weak-list-unique weak-list)
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88
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89 ;; Equivalent test for `intern' and `gentemp'.
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90 (eval
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91 '(set-weak-list-list weak-list
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92 (list (intern (ts-fresh-symbol-name "foo"))
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93 (gentemp (ts-fresh-symbol-name "bar")))))
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94 (check-weak-list-unique weak-list 'not)))
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95
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96 (Assert (not (intern-soft (make-symbol "foo"))))
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97 (Assert (not (intern-soft (gensym "foo"))))
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98 (Assert (intern-soft (intern (ts-fresh-symbol-name "foo"))))
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99 (Assert (intern-soft (gentemp (ts-fresh-symbol-name "bar"))))
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100
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101 ;; Reading a symbol should intern it automatically, unless the symbol
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102 ;; is marked specially.
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103 (dolist (string (mapcar #'ts-fresh-symbol-name '("foo" "bar" "\\\0\\\1")))
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104 (setq symbol (read string)
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105 string (read (concat "\"" string "\"")))
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106 (Assert (intern-soft string))
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107 (Assert (intern-soft symbol))
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108 (Assert (eq (intern-soft string) (intern-soft symbol))))
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109
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110 (let ((fresh (read (concat "#:" (ts-fresh-symbol-name "foo")))))
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111 (Assert (not (intern-soft fresh))))
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112
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113 ;; Check #N=OBJECT and #N# read syntax.
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114 (let* ((list (read "(#1=#:foo #1# #2=#:bar #2# #1# #2#)"))
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115 (foo (nth 0 list))
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116 (foo2 (nth 1 list))
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117 (bar (nth 2 list))
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118 (bar2 (nth 3 list))
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119 (foo3 (nth 4 list))
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120 (bar3 (nth 5 list)))
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121 (Assert (symbolp foo))
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122 (Assert (not (intern-soft foo)))
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123 (Assert (equal (symbol-name foo) "foo"))
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124 (Assert (symbolp bar))
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125 (Assert (not (intern-soft bar)))
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126 (Assert (equal (symbol-name bar) "bar"))
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127
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128 (Assert (eq foo foo2))
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129 (Assert (eq foo2 foo3))
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130 (Assert (eq bar bar2))
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131 (Assert (eq bar2 bar3)))
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132
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133 ;; Check #N=OBJECT and #N# print syntax.
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134 (let* ((foo (make-symbol "foo"))
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135 (bar (make-symbol "bar"))
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136 (list (list foo foo bar bar foo bar)))
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137 (let* ((print-gensym nil)
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138 (printed-list (prin1-to-string list)))
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139 (Assert (equal printed-list "(foo foo bar bar foo bar)")))
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140 (let* ((print-gensym t)
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141 (printed-list (prin1-to-string list)))
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142 (Assert (equal printed-list "(#1=#:foo #1# #2=#:bar #2# #1# #2#)"))))
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143
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144 ;;-----------------------------------------------------
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145 ;; Read-only symbols
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146 ;;-----------------------------------------------------
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147
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148 (Check-Error setting-constant
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149 (set nil nil))
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150 (Check-Error setting-constant
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151 (set t nil))
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152
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153 ;;-----------------------------------------------------
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154 ;; Variable indirections
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155 ;;-----------------------------------------------------
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156
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157 (let ((foo 0)
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158 (bar 1))
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159 (defvaralias 'foo 'bar)
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160 (Assert (eq foo bar))
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161 (Assert (eq foo 1))
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162 (Assert (eq (variable-alias 'foo) 'bar))
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163 (defvaralias 'bar 'foo)
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164 (Check-Error cyclic-variable-indirection
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165 (symbol-value 'foo))
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166 (Check-Error cyclic-variable-indirection
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167 (symbol-value 'bar))
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168 (defvaralias 'foo nil)
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169 (Assert (eq foo 0))
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170 (defvaralias 'bar nil)
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171 (Assert (eq bar 1)))
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172
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173 ;;-----------------------------------------------------
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174 ;; Keywords
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175 ;;-----------------------------------------------------
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176
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177 ;;; Reading keywords
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178
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179 ;; In Elisp, a keyword is by definition a symbol beginning with `:'
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180 ;; that is interned in the global obarray.
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181
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182 ;; In Elisp, a keyword is interned as any other symbol.
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183 (Assert (eq (read ":foo") (intern ":foo")))
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184
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185 ;; A keyword is self-quoting and evaluates to itself.
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186 (Assert (eq (eval (intern ":foo")) :foo))
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187
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188 ;; Keywords are recognized as such only if interned in the global
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189 ;; obarray, and `keywordp' is aware of that.
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190 (Assert (keywordp :foo))
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191 (Assert (not (keywordp (intern ":foo" [0]))))
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192
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193 ;; Keywords used to be initialized at read-time, which resulted in
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194 ;; (symbol-value (intern ":some-new-keyword")) signaling an error.
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195 ;; Now we handle keywords at the time when the symbol is interned, so
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196 ;; that (intern ":something) and (read ":something) will be
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197 ;; equivalent. These tests check various operations on symbols that
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198 ;; are guaranteed to be freshly interned.
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199
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200 ;; Interning a fresh keyword string should produce a regular
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201 ;; keyword.
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202 (let* ((fresh-keyword-name (ts-fresh-symbol-name ":foo"))
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203 (fresh-keyword (intern fresh-keyword-name)))
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204 (Assert (eq (symbol-value fresh-keyword) fresh-keyword))
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205 (Assert (keywordp fresh-keyword)))
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206
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207 ;; Likewise, reading a fresh keyword string should produce a regular
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208 ;; keyword.
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209 (let* ((fresh-keyword-name (ts-fresh-symbol-name ":foo"))
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210 (fresh-keyword (read fresh-keyword-name)))
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211 (Assert (eq (symbol-value fresh-keyword) fresh-keyword))
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212 (Assert (keywordp fresh-keyword)))
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213
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214 ;;; Assigning to keywords
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215
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216 ;; You shouldn't be able to set its value to something bogus.
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217 (Check-Error setting-constant
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218 (set :foo 5))
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219
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220 ;; But, for backward compatibility, setting to the same value is OK.
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221 (Assert
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222 (eq (set :foo :foo) :foo))
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223
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224 ;; Playing games with `intern' shouldn't fool us.
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225 (Check-Error setting-constant
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226 (set (intern ":foo" obarray) 5))
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227 (Assert
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228 (eq (set (intern ":foo" obarray) :foo) :foo))
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229
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230 ;; But symbols not interned in the global obarray are not real
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231 ;; keywords (in elisp):
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232 (Assert (eq (set (intern ":foo" [0]) 5) 5))
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233
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234 ;;; Printing keywords
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235
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236 (let ((print-gensym t))
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237 (Assert (equal (prin1-to-string :foo) ":foo"))
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238 (Assert (equal (prin1-to-string (intern ":foo")) ":foo"))
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239 (Assert (equal (prin1-to-string (intern ":foo" [0])) "#::foo")))
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240
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241 (let ((print-gensym nil))
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242 (Assert (equal (prin1-to-string :foo) ":foo"))
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243 (Assert (equal (prin1-to-string (intern ":foo")) ":foo"))
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244 (Assert (equal (prin1-to-string (intern ":foo" [0])) ":foo")))
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245
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246 ;; #### Add many more tests for printing and reading symbols, as well
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247 ;; as print-gensym and print-gensym-alist!
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248
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249 ;;-----------------------------------------------------
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250 ;; Magic symbols
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251 ;;-----------------------------------------------------
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252
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253 ;; Magic symbols are only half implemented. However, a subset of the
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254 ;; functionality is being used to implement backward compatibility or
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255 ;; clearer error messages for new features such as specifiers and
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256 ;; glyphs. These tests try to test that working subset.
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257
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258 (let ((mysym (make-symbol "test-symbol"))
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259 save)
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260 (dontusethis-set-symbol-value-handler
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261 mysym
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262 'set-value
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263 (lambda (&rest args)
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264 (throw 'test-tag args)))
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265 (Assert (not (boundp mysym)))
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266 (Assert (equal (catch 'test-tag
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267 (set mysym 'foo))
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268 `(,mysym (foo) set nil nil)))
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269 (Assert (not (boundp mysym)))
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270 (dontusethis-set-symbol-value-handler
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271 mysym
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272 'set-value
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273 (lambda (&rest args) (setq save (nth 1 args))))
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274 (set mysym 'foo)
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275 (Assert (equal save '(foo)))
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276 (Assert (eq (symbol-value mysym) 'foo))
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277 )
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278
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279 (let ((mysym (make-symbol "test-symbol"))
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280 save)
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281 (dontusethis-set-symbol-value-handler
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282 mysym
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283 'make-unbound
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284 (lambda (&rest args)
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285 (throw 'test-tag args)))
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286 (Assert (equal (catch 'test-tag
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287 (makunbound mysym))
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288 `(,mysym nil makunbound nil nil)))
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289 (dontusethis-set-symbol-value-handler
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290 mysym
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291 'make-unbound
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292 (lambda (&rest args) (setq save (nth 2 args))))
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293 (Assert (not (boundp mysym)))
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294 (set mysym 'bar)
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295 (Assert (null save))
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296 (Assert (eq (symbol-value mysym) 'bar))
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297 (makunbound mysym)
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298 (Assert (not (boundp mysym)))
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299 (Assert (eq save 'makunbound))
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300 )
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301
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302 (when (featurep 'file-coding)
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303 (Assert (eq pathname-coding-system file-name-coding-system))
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304 (let ((val1 file-name-coding-system)
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305 (val2 pathname-coding-system))
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306 (Assert (eq val1 val2))
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307 (let ((file-name-coding-system 'no-conversion-dos))
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308 (Assert (eq file-name-coding-system 'no-conversion-dos))
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309 (Assert (eq pathname-coding-system file-name-coding-system)))
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310 (let ((pathname-coding-system 'no-conversion-mac))
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311 (Assert (eq file-name-coding-system 'no-conversion-mac))
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312 (Assert (eq pathname-coding-system file-name-coding-system)))
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313 (Assert (eq file-name-coding-system pathname-coding-system))
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314 (Assert (eq val1 file-name-coding-system)))
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315 (Assert (eq pathname-coding-system file-name-coding-system)))
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316
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317
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318 ;(let ((mysym (make-symbol "test-symbol")))
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319 ; (dontusethis-set-symbol-value-handler
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320 ; mysym
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321 ; 'make-local
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322 ; (lambda (&rest args)
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323 ; (throw 'test-tag args)))
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324 ; (Assert (equal (catch 'test-tag
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325 ; (set mysym 'foo))
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326 ; `(,mysym (foo) make-local nil nil))))
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