1 | /* |
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2 | * function_info.java |
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3 | * |
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4 | * Copyright (C) 2004-2005 Peter Graves |
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5 | * $Id: function_info.java 14466 2013-04-24 12:50:40Z rschlatte $ |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU General Public License |
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9 | * as published by the Free Software Foundation; either version 2 |
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10 | * of the License, or (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 | * |
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21 | * As a special exception, the copyright holders of this library give you |
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22 | * permission to link this library with independent modules to produce an |
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23 | * executable, regardless of the license terms of these independent |
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24 | * modules, and to copy and distribute the resulting executable under |
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25 | * terms of your choice, provided that you also meet, for each linked |
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26 | * independent module, the terms and conditions of the license of that |
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27 | * module. An independent module is a module which is not derived from |
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28 | * or based on this library. If you modify this library, you may extend |
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29 | * this exception to your version of the library, but you are not |
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30 | * obligated to do so. If you do not wish to do so, delete this |
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31 | * exception statement from your version. |
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32 | */ |
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33 | |
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34 | package org.armedbear.lisp; |
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35 | |
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36 | import java.util.Map; |
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37 | import java.util.Collections; |
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38 | import java.util.WeakHashMap; |
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39 | import static org.armedbear.lisp.Lisp.*; |
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40 | |
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41 | public final class function_info |
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42 | { |
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43 | // ### TODO: Replace by a concurrent hashmap, with weak keys, ofcourse. |
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44 | final static Map<LispObject,LispObject> symbolToFunctionMap = |
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45 | Collections.synchronizedMap(new WeakHashMap()); |
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46 | |
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47 | // ### function-info name |
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48 | private static final Primitive FUNCTION_INFO = |
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49 | new Primitive("function-info", PACKAGE_SYS, false) |
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50 | { |
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51 | @Override |
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52 | public LispObject execute(LispObject arg) |
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53 | { |
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54 | LispObject info = symbolToFunctionMap.get(arg); |
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55 | return info != null ? info : NIL; |
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56 | } |
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57 | }; |
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58 | |
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59 | // ### %set-function-info name info |
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60 | private static final Primitive _SET_FUNCTION_INFO = |
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61 | new Primitive("%set-function-info", PACKAGE_SYS, false) |
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62 | { |
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63 | @Override |
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64 | public LispObject execute(LispObject name, LispObject info) |
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65 | |
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66 | { |
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67 | if (info == NIL) |
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68 | symbolToFunctionMap.remove(name); |
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69 | else |
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70 | symbolToFunctionMap.put(name, info); |
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71 | return info; |
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72 | } |
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73 | }; |
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74 | |
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75 | // ### get-function-info-value name indicator => value |
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76 | private static final Primitive GET_FUNCTION_INFO_VALUE = |
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77 | new Primitive("get-function-info-value", PACKAGE_SYS, true, |
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78 | "name indicator") |
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79 | { |
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80 | @Override |
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81 | public LispObject execute(LispObject name, LispObject indicator) |
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82 | |
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83 | { |
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84 | // info is an alist |
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85 | LispObject info = symbolToFunctionMap.get(name); |
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86 | if (info != null) { |
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87 | while (info != NIL) { |
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88 | LispObject cons = info.car(); |
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89 | if (cons instanceof Cons) { |
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90 | if (cons.car().eql(indicator)) { |
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91 | // Found it. |
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92 | return LispThread.currentThread().setValues(cons.cdr(), T); |
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93 | } |
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94 | } else if (cons != NIL) |
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95 | type_error(cons, Symbol.LIST); |
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96 | info = info.cdr(); |
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97 | } |
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98 | } |
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99 | return LispThread.currentThread().setValues(NIL, NIL); |
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100 | } |
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101 | }; |
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102 | |
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103 | // ### set-function-info-value name indicator value => value |
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104 | private static final Primitive SET_FUNCTION_INFO_VALUE = |
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105 | new Primitive("set-function-info-value", PACKAGE_SYS, true, |
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106 | "name indicator value") |
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107 | { |
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108 | @Override |
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109 | public LispObject execute(LispObject name, LispObject indicator, |
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110 | LispObject value) |
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111 | |
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112 | { |
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113 | // info is an alist |
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114 | LispObject info = symbolToFunctionMap.get(name); |
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115 | if (info == null) |
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116 | info = NIL; |
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117 | LispObject alist = info; |
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118 | while (alist != NIL) { |
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119 | LispObject cons = alist.car(); |
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120 | if (cons instanceof Cons) { |
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121 | if (cons.car().eql(indicator)) { |
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122 | // Found it. |
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123 | cons.setCdr(value); |
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124 | return value; |
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125 | } |
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126 | } else if (cons != NIL) |
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127 | type_error(cons, Symbol.LIST); |
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128 | alist = alist.cdr(); |
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129 | } |
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130 | // Not found. |
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131 | symbolToFunctionMap.put(name, info.push(new Cons(indicator, value))); |
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132 | return value; |
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133 | } |
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134 | }; |
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135 | } |
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