1 | /* |
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2 | * dotimes.java |
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3 | * |
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4 | * Copyright (C) 2003-2006 Peter Graves |
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5 | * $Id: dotimes.java 15569 2022-03-19 12:50:18Z mevenson $ |
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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 static org.armedbear.lisp.Lisp.*; |
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37 | |
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38 | public final class dotimes extends SpecialOperator |
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39 | { |
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40 | private dotimes() |
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41 | { |
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42 | super(Symbol.DOTIMES); |
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43 | } |
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44 | |
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45 | @Override |
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46 | public LispObject execute(LispObject args, Environment env) |
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47 | |
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48 | { |
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49 | LispObject bodyForm = args.cdr(); |
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50 | args = args.car(); |
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51 | Symbol var = checkSymbol(args.car()); |
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52 | LispObject countForm = args.cadr(); |
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53 | final LispThread thread = LispThread.currentThread(); |
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54 | LispObject resultForm = args.cdr().cdr().car(); |
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55 | final SpecialBindingsMark mark = thread.markSpecialBindings(); |
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56 | |
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57 | LispObject bodyAndDecls = parseBody(bodyForm, false); |
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58 | LispObject specials = parseSpecials(bodyAndDecls.NTH(1)); |
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59 | bodyForm = bodyAndDecls.car(); |
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60 | |
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61 | LispObject blockId = new LispObject(); |
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62 | final Environment ext = new Environment(env); |
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63 | thread.envStack.push(ext); |
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64 | try |
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65 | { |
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66 | ext.addBlock(NIL, blockId); |
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67 | |
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68 | LispObject limit = eval(countForm, ext, thread); |
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69 | LispObject localTags = preprocessTagBody(bodyForm, ext); |
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70 | |
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71 | LispObject result; |
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72 | // Establish a reusable binding. |
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73 | final Object binding; |
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74 | if (specials != NIL && memq(var, specials)) |
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75 | { |
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76 | thread.bindSpecial(var, null); |
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77 | binding = thread.getSpecialBinding(var); |
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78 | ext.declareSpecial(var); |
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79 | } |
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80 | else if (var.isSpecialVariable()) |
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81 | { |
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82 | thread.bindSpecial(var, null); |
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83 | binding = thread.getSpecialBinding(var); |
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84 | } |
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85 | else |
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86 | { |
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87 | ext.bind(var, null); |
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88 | binding = ext.getBinding(var); |
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89 | } |
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90 | while (specials != NIL) |
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91 | { |
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92 | ext.declareSpecial(checkSymbol(specials.car())); |
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93 | specials = specials.cdr(); |
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94 | } |
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95 | if (limit instanceof Fixnum) |
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96 | { |
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97 | int count = ((Fixnum)limit).value; |
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98 | int i; |
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99 | for (i = 0; i < count; i++) |
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100 | { |
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101 | if (binding instanceof SpecialBinding) |
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102 | ((SpecialBinding)binding).value = Fixnum.getInstance(i); |
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103 | else |
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104 | ((Binding)binding).value = Fixnum.getInstance(i); |
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105 | |
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106 | processTagBody(bodyForm, localTags, ext); |
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107 | |
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108 | if (interrupted) |
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109 | handleInterrupt(); |
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110 | } |
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111 | if (binding instanceof SpecialBinding) |
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112 | ((SpecialBinding)binding).value = Fixnum.getInstance(i); |
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113 | else |
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114 | ((Binding)binding).value = Fixnum.getInstance(i); |
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115 | result = eval(resultForm, ext, thread); |
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116 | } |
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117 | else if (limit instanceof Bignum) |
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118 | { |
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119 | LispObject i = Fixnum.ZERO; |
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120 | while (i.isLessThan(limit)) |
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121 | { |
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122 | if (binding instanceof SpecialBinding) |
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123 | ((SpecialBinding)binding).value = i; |
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124 | else |
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125 | ((Binding)binding).value = i; |
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126 | |
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127 | processTagBody(bodyForm, localTags, ext); |
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128 | |
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129 | i = i.incr(); |
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130 | if (interrupted) |
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131 | handleInterrupt(); |
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132 | } |
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133 | if (binding instanceof SpecialBinding) |
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134 | ((SpecialBinding)binding).value = i; |
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135 | else |
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136 | ((Binding)binding).value = i; |
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137 | result = eval(resultForm, ext, thread); |
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138 | } |
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139 | else |
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140 | return type_error(limit, Symbol.INTEGER); |
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141 | return result; |
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142 | } |
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143 | catch (Return ret) |
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144 | { |
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145 | if (ret.getBlock() == blockId) |
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146 | { |
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147 | return ret.getResult(); |
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148 | } |
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149 | throw ret; |
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150 | } |
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151 | finally |
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152 | { |
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153 | thread.resetSpecialBindings(mark); |
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154 | ext.inactive = true; |
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155 | while (thread.envStack.pop() != ext) {}; |
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156 | } |
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157 | } |
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158 | |
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159 | private static final dotimes DOTIMES = new dotimes(); |
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160 | } |
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