1 | /* |
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2 | * Closure.java |
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3 | * |
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4 | * Copyright (C) 2002-2008 Peter Graves |
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5 | * Copyright (C) 2008 Ville Voutilainen |
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6 | * $Id: Closure.java 14465 2013-04-24 12:50:37Z rschlatte $ |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU General Public License |
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10 | * as published by the Free Software Foundation; either version 2 |
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11 | * of the License, or (at your option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with this program; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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21 | * |
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22 | * As a special exception, the copyright holders of this library give you |
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23 | * permission to link this library with independent modules to produce an |
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24 | * executable, regardless of the license terms of these independent |
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25 | * modules, and to copy and distribute the resulting executable under |
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26 | * terms of your choice, provided that you also meet, for each linked |
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27 | * independent module, the terms and conditions of the license of that |
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28 | * module. An independent module is a module which is not derived from |
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29 | * or based on this library. If you modify this library, you may extend |
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30 | * this exception to your version of the library, but you are not |
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31 | * obligated to do so. If you do not wish to do so, delete this |
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32 | * exception statement from your version. |
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33 | */ |
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34 | |
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35 | package org.armedbear.lisp; |
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36 | |
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37 | import static org.armedbear.lisp.Lisp.*; |
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38 | |
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39 | public class Closure extends Function |
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40 | { |
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41 | // Parameter types. |
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42 | public static final int REQUIRED = 0; |
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43 | public static final int OPTIONAL = 1; |
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44 | public static final int KEYWORD = 2; |
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45 | public static final int REST = 3; |
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46 | public static final int AUX = 4; |
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47 | |
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48 | private final LispObject body; |
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49 | private final LispObject executionBody; |
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50 | private final Environment environment; |
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51 | |
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52 | private final Symbol[] freeSpecials; |
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53 | private final ArgumentListProcessor arglist; |
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54 | |
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55 | /** Construct a closure object with a lambda-list described |
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56 | * by these parameters. |
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57 | * |
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58 | * |
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59 | * @param required Required parameters or an empty array for none |
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60 | * @param optional Optional parameters or an empty array for none |
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61 | * @param keyword Keyword parameters or an empty array for none |
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62 | * @param keys NIL if the lambda-list doesn't contain &key, T otherwise |
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63 | * @param rest the &rest parameter, or NIL if none |
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64 | * @param moreKeys NIL if &allow-other-keys not present, T otherwise |
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65 | */ |
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66 | public Closure(ArgumentListProcessor arglist) { |
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67 | // stuff we don't need: we're a compiled function |
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68 | body = null; |
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69 | executionBody = null; |
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70 | environment = null; |
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71 | this.arglist = arglist; |
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72 | freeSpecials = new Symbol[0]; |
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73 | } |
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74 | |
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75 | |
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76 | public Closure(LispObject lambdaExpression, Environment env) |
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77 | { |
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78 | this(null, lambdaExpression, env); |
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79 | } |
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80 | |
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81 | public Closure(final LispObject name, final LispObject lambdaExpression, |
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82 | final Environment env) |
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83 | |
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84 | { |
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85 | super(name, lambdaExpression.cadr()); |
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86 | final LispObject lambdaList = lambdaExpression.cadr(); |
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87 | setLambdaList(lambdaList); |
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88 | if (!(lambdaList == NIL || lambdaList instanceof Cons)) |
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89 | program_error("The lambda list " + lambdaList.princToString() |
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90 | + " is invalid."); |
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91 | this.body = lambdaExpression.cddr(); |
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92 | LispObject bodyAndDecls = parseBody(this.body, false); |
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93 | this.executionBody = bodyAndDecls.car(); |
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94 | LispObject specials = parseSpecials(bodyAndDecls.NTH(1)); |
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95 | |
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96 | this.environment = env; |
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97 | |
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98 | /* In the bootstrapping process, functions with MACRO LAMBDA LIST |
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99 | * lambda list types are being generated using the MACRO_FUNCTION instead |
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100 | * of the LAMBDA or NAMED_LAMBDA keys. |
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101 | * |
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102 | * Use that to perform argument list lambda list keyword checking. |
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103 | */ |
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104 | arglist = new ArgumentListProcessor(this, lambdaList, specials, |
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105 | (lambdaExpression.car() == Symbol.MACRO_FUNCTION) ? |
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106 | ArgumentListProcessor.LambdaListType.MACRO |
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107 | : ArgumentListProcessor.LambdaListType.ORDINARY); |
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108 | freeSpecials = arglist.freeSpecials(specials); |
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109 | } |
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110 | |
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111 | @Override |
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112 | public LispObject typep(LispObject typeSpecifier) |
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113 | { |
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114 | if (typeSpecifier == Symbol.COMPILED_FUNCTION) |
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115 | return NIL; |
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116 | return super.typep(typeSpecifier); |
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117 | } |
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118 | |
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119 | public final LispObject getVariableList() |
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120 | { |
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121 | Symbol[] variables = arglist.getVariables(); |
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122 | LispObject result = NIL; |
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123 | for (int i = variables.length; i-- > 0;) |
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124 | result = new Cons(variables[i], result); |
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125 | return result; |
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126 | } |
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127 | |
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128 | // Returns body as a list. |
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129 | public final LispObject getBody() |
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130 | { |
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131 | return body; |
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132 | } |
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133 | |
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134 | public final Environment getEnvironment() |
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135 | { |
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136 | return environment; |
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137 | } |
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138 | |
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139 | @Override |
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140 | public LispObject execute() |
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141 | { |
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142 | return execute(new LispObject[0]); |
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143 | } |
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144 | |
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145 | @Override |
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146 | public LispObject execute(LispObject arg) |
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147 | { |
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148 | return execute(new LispObject[] {arg}); |
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149 | } |
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150 | |
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151 | @Override |
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152 | public LispObject execute(LispObject first, LispObject second) |
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153 | { |
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154 | return execute(new LispObject[] {first, second}); |
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155 | } |
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156 | |
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157 | @Override |
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158 | public LispObject execute(LispObject first, LispObject second, |
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159 | LispObject third) |
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160 | { |
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161 | return execute(new LispObject[] {first, second, third}); |
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162 | } |
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163 | |
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164 | @Override |
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165 | public LispObject execute(LispObject first, LispObject second, |
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166 | LispObject third, LispObject fourth) |
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167 | { |
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168 | return execute(new LispObject[] {first, second, third, fourth}); |
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169 | } |
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170 | |
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171 | @Override |
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172 | public LispObject execute(LispObject first, LispObject second, |
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173 | LispObject third, LispObject fourth, |
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174 | LispObject fifth) |
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175 | { |
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176 | return execute(new LispObject[] {first, second, third, fourth, fifth}); |
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177 | } |
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178 | |
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179 | @Override |
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180 | public LispObject execute(LispObject first, LispObject second, |
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181 | LispObject third, LispObject fourth, |
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182 | LispObject fifth, LispObject sixth) |
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183 | { |
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184 | return execute(new LispObject[] {first, second, third, fourth, fifth, |
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185 | sixth}); |
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186 | } |
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187 | |
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188 | @Override |
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189 | public LispObject execute(LispObject first, LispObject second, |
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190 | LispObject third, LispObject fourth, |
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191 | LispObject fifth, LispObject sixth, |
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192 | LispObject seventh) |
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193 | { |
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194 | return execute(new LispObject[] {first, second, third, fourth, fifth, |
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195 | sixth, seventh}); |
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196 | } |
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197 | |
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198 | @Override |
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199 | public LispObject execute(LispObject first, LispObject second, |
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200 | LispObject third, LispObject fourth, |
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201 | LispObject fifth, LispObject sixth, |
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202 | LispObject seventh, LispObject eighth) |
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203 | { |
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204 | return execute(new LispObject[] {first, second, third, fourth, fifth, |
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205 | sixth, seventh, eighth}); |
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206 | } |
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207 | |
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208 | @Override |
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209 | public LispObject execute(LispObject[] args) |
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210 | { |
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211 | final LispThread thread = LispThread.currentThread(); |
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212 | final SpecialBindingsMark mark = thread.markSpecialBindings(); |
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213 | Environment ext = new Environment(environment); |
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214 | args = arglist.match(args, environment, ext, thread); |
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215 | arglist.bindVars(args, ext, thread); |
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216 | for (Symbol special : freeSpecials) |
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217 | ext.declareSpecial(special); |
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218 | try |
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219 | { |
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220 | return progn(executionBody, ext, thread); |
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221 | } |
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222 | finally |
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223 | { |
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224 | thread.resetSpecialBindings(mark); |
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225 | } |
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226 | } |
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227 | |
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228 | protected final LispObject[] processArgs(LispObject[] args, LispThread thread) |
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229 | { |
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230 | return arglist.match(args, environment, environment, thread); |
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231 | } |
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232 | } |
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