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 12513 2010-03-02 22:35:36Z ehuelsmann $ |
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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 | import java.util.ArrayList; |
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40 | |
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41 | public class Closure extends Function |
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42 | { |
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43 | // Parameter types. |
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44 | public static final int REQUIRED = 0; |
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45 | public static final int OPTIONAL = 1; |
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46 | public static final int KEYWORD = 2; |
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47 | public static final int REST = 3; |
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48 | public static final int AUX = 4; |
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49 | |
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50 | // States. |
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51 | private static final int STATE_REQUIRED = 0; |
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52 | private static final int STATE_OPTIONAL = 1; |
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53 | private static final int STATE_KEYWORD = 2; |
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54 | private static final int STATE_REST = 3; |
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55 | private static final int STATE_AUX = 4; |
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56 | |
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57 | private Parameter[] requiredParameters = new Parameter[0]; |
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58 | private Parameter[] optionalParameters = requiredParameters; |
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59 | private Parameter[] keywordParameters = requiredParameters; |
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60 | private Parameter[] auxVars = requiredParameters; |
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61 | private final LispObject body; |
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62 | private final LispObject executionBody; |
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63 | private final Environment environment; |
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64 | private final boolean andKey; |
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65 | private final boolean allowOtherKeys; |
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66 | private Symbol restVar; |
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67 | private Symbol envVar; |
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68 | private int arity; |
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69 | |
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70 | private int minArgs; |
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71 | private int maxArgs; |
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72 | |
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73 | private Symbol[] variables = new Symbol[0]; |
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74 | private LispObject specials = NIL; |
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75 | |
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76 | private boolean bindInitForms; |
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77 | |
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78 | |
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79 | /** Construct a closure object with a lambda-list described |
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80 | * by these parameters. |
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81 | * |
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82 | * |
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83 | * @param required Required parameters or an empty array for none |
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84 | * @param optional Optional parameters or an empty array for none |
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85 | * @param keyword Keyword parameters or an empty array for none |
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86 | * @param keys NIL if the lambda-list doesn't contain &key, T otherwise |
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87 | * @param rest the &rest parameter, or NIL if none |
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88 | * @param moreKeys NIL if &allow-other-keys not present, T otherwise |
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89 | */ |
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90 | public Closure(Parameter[] required, |
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91 | Parameter[] optional, |
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92 | Parameter[] keyword, |
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93 | Symbol keys, Symbol rest, Symbol moreKeys) { |
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94 | minArgs = required.length; |
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95 | maxArgs = (rest == NIL && moreKeys == NIL) |
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96 | ? minArgs + optional.length + 2*keyword.length : -1; |
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97 | |
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98 | arity = (rest == NIL && moreKeys == NIL && keys == NIL |
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99 | && optional.length == 0) |
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100 | ? maxArgs : -1; |
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101 | |
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102 | requiredParameters = required; |
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103 | optionalParameters = optional; |
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104 | keywordParameters = keyword; |
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105 | |
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106 | if (rest != NIL) |
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107 | restVar = rest; |
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108 | |
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109 | andKey = keys != NIL; |
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110 | allowOtherKeys = moreKeys != NIL; |
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111 | variables = processVariables(); |
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112 | bindInitForms = false; |
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113 | |
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114 | // stuff we don't need: we're a compiled function |
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115 | body = null; |
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116 | executionBody = null; |
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117 | environment = null; |
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118 | } |
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119 | |
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120 | |
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121 | public Closure(LispObject lambdaExpression, Environment env) |
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122 | { |
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123 | this(null, lambdaExpression, env); |
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124 | } |
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125 | |
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126 | public Closure(final LispObject name, final LispObject lambdaExpression, |
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127 | final Environment env) |
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128 | |
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129 | { |
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130 | super(name, lambdaExpression.cadr()); |
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131 | final LispObject lambdaList = lambdaExpression.cadr(); |
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132 | setLambdaList(lambdaList); |
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133 | if (!(lambdaList == NIL || lambdaList instanceof Cons)) |
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134 | error(new ProgramError("The lambda list " + lambdaList.writeToString() + |
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135 | " is invalid.")); |
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136 | boolean _andKey = false; |
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137 | boolean _allowOtherKeys = false; |
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138 | if (lambdaList instanceof Cons) |
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139 | { |
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140 | final int length = lambdaList.length(); |
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141 | ArrayList<Parameter> required = null; |
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142 | ArrayList<Parameter> optional = null; |
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143 | ArrayList<Parameter> keywords = null; |
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144 | ArrayList<Parameter> aux = null; |
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145 | int state = STATE_REQUIRED; |
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146 | LispObject remaining = lambdaList; |
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147 | while (remaining != NIL) |
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148 | { |
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149 | LispObject obj = remaining.car(); |
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150 | if (obj instanceof Symbol) |
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151 | { |
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152 | if (state == STATE_AUX) |
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153 | { |
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154 | if (aux == null) |
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155 | aux = new ArrayList<Parameter>(); |
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156 | aux.add(new Parameter((Symbol)obj, NIL, AUX)); |
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157 | } |
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158 | else if (obj == Symbol.AND_OPTIONAL) |
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159 | { |
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160 | state = STATE_OPTIONAL; |
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161 | arity = -1; |
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162 | } |
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163 | else if (obj == Symbol.AND_REST || obj == Symbol.AND_BODY) |
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164 | { |
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165 | state = STATE_REST; |
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166 | arity = -1; |
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167 | maxArgs = -1; |
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168 | remaining = remaining.cdr(); |
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169 | if (remaining == NIL) |
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170 | { |
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171 | error(new ProgramError( |
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172 | "&REST/&BODY must be followed by a variable.")); |
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173 | } |
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174 | if (restVar != null) |
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175 | { |
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176 | error(new ProgramError( |
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177 | "&REST/&BODY may occur only once.")); |
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178 | } |
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179 | final LispObject remainingcar = remaining.car(); |
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180 | if (remainingcar instanceof Symbol) |
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181 | { |
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182 | restVar = (Symbol) remainingcar; |
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183 | } |
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184 | else |
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185 | { |
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186 | error(new ProgramError( |
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187 | "&REST/&BODY must be followed by a variable.")); |
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188 | } |
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189 | } |
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190 | else if (obj == Symbol.AND_ENVIRONMENT) |
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191 | { |
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192 | remaining = remaining.cdr(); |
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193 | envVar = (Symbol) remaining.car(); |
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194 | arity = -1; // FIXME |
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195 | } |
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196 | else if (obj == Symbol.AND_KEY) |
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197 | { |
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198 | state = STATE_KEYWORD; |
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199 | _andKey = true; |
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200 | arity = -1; |
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201 | } |
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202 | else if (obj == Symbol.AND_ALLOW_OTHER_KEYS) |
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203 | { |
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204 | _allowOtherKeys = true; |
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205 | maxArgs = -1; |
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206 | } |
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207 | else if (obj == Symbol.AND_AUX) |
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208 | { |
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209 | // All remaining specifiers are aux variable specifiers. |
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210 | state = STATE_AUX; |
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211 | arity = -1; // FIXME |
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212 | } |
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213 | else |
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214 | { |
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215 | if (state == STATE_OPTIONAL) |
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216 | { |
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217 | if (optional == null) |
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218 | optional = new ArrayList<Parameter>(); |
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219 | optional.add(new Parameter((Symbol)obj, NIL, OPTIONAL)); |
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220 | if (maxArgs >= 0) |
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221 | ++maxArgs; |
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222 | } |
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223 | else if (state == STATE_KEYWORD) |
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224 | { |
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225 | if (keywords == null) |
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226 | keywords = new ArrayList<Parameter>(); |
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227 | keywords.add(new Parameter((Symbol)obj, NIL, KEYWORD)); |
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228 | if (maxArgs >= 0) |
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229 | maxArgs += 2; |
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230 | } |
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231 | else |
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232 | { |
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233 | if (state != STATE_REQUIRED) |
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234 | { |
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235 | error(new ProgramError( |
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236 | "required parameters cannot appear after &REST/&BODY.")); |
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237 | } |
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238 | if (required == null) |
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239 | required = new ArrayList<Parameter>(); |
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240 | required.add(new Parameter((Symbol)obj)); |
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241 | if (maxArgs >= 0) |
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242 | ++maxArgs; |
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243 | } |
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244 | } |
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245 | } |
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246 | else if (obj instanceof Cons) |
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247 | { |
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248 | if (state == STATE_AUX) |
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249 | { |
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250 | Symbol sym = checkSymbol(obj.car()); |
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251 | LispObject initForm = obj.cadr(); |
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252 | Debug.assertTrue(initForm != null); |
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253 | if (aux == null) |
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254 | aux = new ArrayList<Parameter>(); |
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255 | aux.add(new Parameter(sym, initForm, AUX)); |
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256 | } |
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257 | else if (state == STATE_OPTIONAL) |
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258 | { |
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259 | Symbol sym = checkSymbol(obj.car()); |
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260 | LispObject initForm = obj.cadr(); |
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261 | LispObject svar = obj.cdr().cdr().car(); |
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262 | if (optional == null) |
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263 | optional = new ArrayList<Parameter>(); |
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264 | optional.add(new Parameter(sym, initForm, svar, OPTIONAL)); |
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265 | if (maxArgs >= 0) |
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266 | ++maxArgs; |
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267 | } |
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268 | else if (state == STATE_KEYWORD) |
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269 | { |
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270 | Symbol keyword; |
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271 | Symbol var; |
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272 | LispObject initForm = NIL; |
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273 | LispObject svar = NIL; |
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274 | LispObject first = obj.car(); |
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275 | if (first instanceof Cons) |
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276 | { |
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277 | keyword = checkSymbol(first.car()); |
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278 | var = checkSymbol(first.cadr()); |
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279 | } |
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280 | else |
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281 | { |
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282 | var = checkSymbol(first); |
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283 | keyword = |
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284 | PACKAGE_KEYWORD.intern(var.name); |
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285 | } |
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286 | obj = obj.cdr(); |
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287 | if (obj != NIL) |
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288 | { |
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289 | initForm = obj.car(); |
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290 | obj = obj.cdr(); |
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291 | if (obj != NIL) |
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292 | svar = obj.car(); |
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293 | } |
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294 | if (keywords == null) |
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295 | keywords = new ArrayList<Parameter>(); |
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296 | keywords.add(new Parameter(keyword, var, initForm, svar)); |
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297 | if (maxArgs >= 0) |
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298 | maxArgs += 2; |
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299 | } |
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300 | else |
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301 | invalidParameter(obj); |
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302 | } |
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303 | else |
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304 | invalidParameter(obj); |
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305 | remaining = remaining.cdr(); |
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306 | } |
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307 | if (arity == 0) |
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308 | arity = length; |
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309 | if (required != null) |
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310 | { |
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311 | requiredParameters = new Parameter[required.size()]; |
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312 | required.toArray(requiredParameters); |
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313 | } |
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314 | if (optional != null) |
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315 | { |
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316 | optionalParameters = new Parameter[optional.size()]; |
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317 | optional.toArray(optionalParameters); |
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318 | } |
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319 | if (keywords != null) |
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320 | { |
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321 | keywordParameters = new Parameter[keywords.size()]; |
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322 | keywords.toArray(keywordParameters); |
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323 | } |
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324 | if (aux != null) |
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325 | { |
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326 | auxVars = new Parameter[aux.size()]; |
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327 | aux.toArray(auxVars); |
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328 | } |
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329 | } |
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330 | else |
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331 | { |
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332 | // Lambda list is empty. |
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333 | Debug.assertTrue(lambdaList == NIL); |
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334 | arity = 0; |
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335 | maxArgs = 0; |
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336 | } |
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337 | this.body = lambdaExpression.cddr(); |
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338 | LispObject bodyAndDecls = parseBody(this.body, false); |
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339 | this.executionBody = bodyAndDecls.car(); |
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340 | this.specials = parseSpecials(bodyAndDecls.NTH(1)); |
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341 | |
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342 | this.environment = env; |
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343 | this.andKey = _andKey; |
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344 | this.allowOtherKeys = _allowOtherKeys; |
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345 | minArgs = requiredParameters.length; |
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346 | if (arity >= 0) |
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347 | Debug.assertTrue(arity == minArgs); |
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348 | variables = processVariables(); |
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349 | } |
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350 | |
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351 | private final void processParameters(ArrayList<Symbol> vars, |
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352 | final Parameter[] parameters) |
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353 | { |
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354 | for (Parameter parameter : parameters) |
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355 | { |
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356 | vars.add(parameter.var); |
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357 | if (parameter.svar != NIL) |
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358 | vars.add((Symbol)parameter.svar); |
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359 | if (!bindInitForms) |
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360 | if (!parameter.initForm.constantp()) |
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361 | bindInitForms = true; |
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362 | } |
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363 | } |
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364 | |
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365 | // Also sets bindInitForms. |
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366 | private final Symbol[] processVariables() |
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367 | { |
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368 | ArrayList<Symbol> vars = new ArrayList<Symbol>(); |
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369 | for (Parameter parameter : requiredParameters) |
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370 | vars.add(parameter.var); |
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371 | processParameters(vars, optionalParameters); |
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372 | if (restVar != null) |
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373 | { |
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374 | vars.add(restVar); |
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375 | } |
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376 | processParameters(vars, keywordParameters); |
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377 | Symbol[] array = new Symbol[vars.size()]; |
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378 | vars.toArray(array); |
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379 | return array; |
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380 | } |
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381 | |
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382 | private static final void invalidParameter(LispObject obj) |
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383 | |
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384 | { |
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385 | error(new ProgramError(obj.writeToString() + |
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386 | " may not be used as a variable in a lambda list.")); |
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387 | } |
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388 | |
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389 | @Override |
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390 | public LispObject typep(LispObject typeSpecifier) |
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391 | { |
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392 | if (typeSpecifier == Symbol.COMPILED_FUNCTION) |
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393 | return NIL; |
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394 | return super.typep(typeSpecifier); |
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395 | } |
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396 | |
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397 | public final LispObject getVariableList() |
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398 | { |
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399 | LispObject result = NIL; |
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400 | for (int i = variables.length; i-- > 0;) |
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401 | result = new Cons(variables[i], result); |
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402 | return result; |
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403 | } |
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404 | |
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405 | // Returns body as a list. |
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406 | public final LispObject getBody() |
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407 | { |
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408 | return body; |
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409 | } |
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410 | |
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411 | public final Environment getEnvironment() |
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412 | { |
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413 | return environment; |
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414 | } |
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415 | |
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416 | @Override |
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417 | public LispObject execute() |
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418 | { |
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419 | if (arity == 0) |
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420 | { |
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421 | return progn(executionBody, environment, |
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422 | LispThread.currentThread()); |
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423 | } |
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424 | else |
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425 | return execute(new LispObject[0]); |
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426 | } |
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427 | |
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428 | private final LispObject bindParametersAndExecute(LispObject... objects) |
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429 | |
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430 | { |
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431 | final LispThread thread = LispThread.currentThread(); |
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432 | final SpecialBindingsMark mark = thread.markSpecialBindings(); |
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433 | Environment ext = new Environment(environment); |
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434 | bindRequiredParameters(ext, thread, objects); |
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435 | if (arity != minArgs) |
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436 | { |
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437 | bindParameterDefaults(optionalParameters, ext, thread); |
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438 | if (restVar != null) |
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439 | bindArg(specials, restVar, NIL, ext, thread); |
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440 | bindParameterDefaults(keywordParameters, ext, thread); |
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441 | } |
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442 | bindAuxVars(ext, thread); |
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443 | declareFreeSpecials(ext); |
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444 | try |
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445 | { |
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446 | return progn(executionBody, ext, thread); |
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447 | } |
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448 | finally |
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449 | { |
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450 | thread.resetSpecialBindings(mark); |
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451 | } |
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452 | } |
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453 | |
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454 | private final void bindRequiredParameters(Environment ext, |
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455 | LispThread thread, |
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456 | LispObject[] objects) |
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457 | |
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458 | { |
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459 | // &whole and &environment before anything |
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460 | if (envVar != null) |
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461 | bindArg(specials, envVar, environment, ext, thread); |
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462 | for (int i = 0; i < objects.length; ++i) |
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463 | { |
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464 | bindArg(specials, requiredParameters[i].var, objects[i], ext, thread); |
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465 | } |
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466 | } |
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467 | |
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468 | public final LispObject invokeArrayExecute(LispObject... objects) |
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469 | |
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470 | { |
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471 | return execute(objects); |
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472 | } |
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473 | |
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474 | @Override |
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475 | public LispObject execute(LispObject arg) |
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476 | { |
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477 | if (minArgs == 1) |
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478 | { |
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479 | return bindParametersAndExecute(arg); |
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480 | } |
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481 | else |
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482 | { |
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483 | return invokeArrayExecute(arg); |
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484 | } |
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485 | } |
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486 | |
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487 | @Override |
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488 | public LispObject execute(LispObject first, LispObject second) |
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489 | |
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490 | { |
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491 | if (minArgs == 2) |
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492 | { |
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493 | return bindParametersAndExecute(first, second); |
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494 | } |
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495 | else |
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496 | { |
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497 | return invokeArrayExecute(first, second); |
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498 | } |
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499 | } |
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500 | |
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501 | @Override |
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502 | public LispObject execute(LispObject first, LispObject second, |
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503 | LispObject third) |
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504 | |
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505 | { |
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506 | if (minArgs == 3) |
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507 | { |
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508 | return bindParametersAndExecute(first, second, third); |
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509 | } |
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510 | else |
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511 | { |
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512 | return invokeArrayExecute(first, second, third); |
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513 | } |
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514 | } |
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515 | |
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516 | @Override |
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517 | public LispObject execute(LispObject first, LispObject second, |
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518 | LispObject third, LispObject fourth) |
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519 | |
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520 | { |
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521 | if (minArgs == 4) |
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522 | { |
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523 | return bindParametersAndExecute(first, second, third, fourth); |
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524 | } |
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525 | else |
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526 | { |
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527 | return invokeArrayExecute(first, second, third, fourth); |
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528 | } |
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529 | } |
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530 | |
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531 | @Override |
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532 | public LispObject execute(LispObject first, LispObject second, |
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533 | LispObject third, LispObject fourth, |
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534 | LispObject fifth) |
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535 | |
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536 | { |
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537 | if (minArgs == 5) |
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538 | { |
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539 | return bindParametersAndExecute(first, second, third, fourth, |
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540 | fifth); |
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541 | } |
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542 | else |
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543 | { |
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544 | return invokeArrayExecute(first, second, third, fourth, fifth); |
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545 | } |
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546 | } |
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547 | |
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548 | @Override |
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549 | public LispObject execute(LispObject first, LispObject second, |
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550 | LispObject third, LispObject fourth, |
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551 | LispObject fifth, LispObject sixth) |
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552 | |
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553 | { |
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554 | if (minArgs == 6) |
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555 | { |
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556 | return bindParametersAndExecute(first, second, third, fourth, |
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557 | fifth, sixth); |
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558 | } |
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559 | else |
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560 | { |
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561 | return invokeArrayExecute(first, second, third, fourth, fifth, |
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562 | sixth); |
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563 | } |
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564 | } |
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565 | |
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566 | @Override |
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567 | public LispObject execute(LispObject first, LispObject second, |
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568 | LispObject third, LispObject fourth, |
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569 | LispObject fifth, LispObject sixth, |
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570 | LispObject seventh) |
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571 | |
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572 | { |
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573 | if (minArgs == 7) |
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574 | { |
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575 | return bindParametersAndExecute(first, second, third, fourth, |
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576 | fifth, sixth, seventh); |
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577 | } |
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578 | else |
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579 | { |
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580 | return invokeArrayExecute(first, second, third, fourth, fifth, |
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581 | sixth, seventh); |
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582 | } |
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583 | } |
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584 | |
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585 | @Override |
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586 | public LispObject execute(LispObject first, LispObject second, |
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587 | LispObject third, LispObject fourth, |
---|
588 | LispObject fifth, LispObject sixth, |
---|
589 | LispObject seventh, LispObject eighth) |
---|
590 | |
---|
591 | { |
---|
592 | if (minArgs == 8) |
---|
593 | { |
---|
594 | return bindParametersAndExecute(first, second, third, fourth, |
---|
595 | fifth, sixth, seventh, eighth); |
---|
596 | } |
---|
597 | else |
---|
598 | { |
---|
599 | return invokeArrayExecute(first, second, third, fourth, fifth, |
---|
600 | sixth, seventh, eighth); |
---|
601 | } |
---|
602 | } |
---|
603 | |
---|
604 | private final void declareFreeSpecials(Environment ext) |
---|
605 | |
---|
606 | { |
---|
607 | LispObject s = specials; |
---|
608 | special: |
---|
609 | while (s != NIL) { |
---|
610 | Symbol special = (Symbol)s.car(); |
---|
611 | s = s.cdr(); |
---|
612 | for (Symbol var : variables) |
---|
613 | if (special == var) |
---|
614 | continue special; |
---|
615 | for (Parameter parameter : auxVars) |
---|
616 | if (special == parameter.var) |
---|
617 | continue special; |
---|
618 | ext.declareSpecial(special); |
---|
619 | } |
---|
620 | } |
---|
621 | |
---|
622 | @Override |
---|
623 | public LispObject execute(LispObject[] args) |
---|
624 | { |
---|
625 | final LispThread thread = LispThread.currentThread(); |
---|
626 | final SpecialBindingsMark mark = thread.markSpecialBindings(); |
---|
627 | Environment ext = new Environment(environment); |
---|
628 | if (optionalParameters.length == 0 && keywordParameters.length == 0) |
---|
629 | args = fastProcessArgs(args); |
---|
630 | else |
---|
631 | args = processArgs(args, thread); |
---|
632 | Debug.assertTrue(args.length == variables.length); |
---|
633 | if (envVar != null) |
---|
634 | { |
---|
635 | bindArg(specials, envVar, environment, ext, thread); |
---|
636 | } |
---|
637 | for (int i = 0; i < variables.length; i++) |
---|
638 | { |
---|
639 | Symbol sym = variables[i]; |
---|
640 | bindArg(specials, sym, args[i], ext, thread); |
---|
641 | } |
---|
642 | bindAuxVars(ext, thread); |
---|
643 | declareFreeSpecials(ext); |
---|
644 | try |
---|
645 | { |
---|
646 | return progn(executionBody, ext, thread); |
---|
647 | } |
---|
648 | finally |
---|
649 | { |
---|
650 | thread.resetSpecialBindings(mark); |
---|
651 | } |
---|
652 | } |
---|
653 | |
---|
654 | protected final LispObject[] processArgs(LispObject[] args, LispThread thread) |
---|
655 | |
---|
656 | { |
---|
657 | if (optionalParameters.length == 0 && keywordParameters.length == 0) |
---|
658 | return fastProcessArgs(args); |
---|
659 | final int argsLength = args.length; |
---|
660 | if (arity >= 0) |
---|
661 | { |
---|
662 | // Fixed arity. |
---|
663 | if (argsLength != arity) |
---|
664 | error(new WrongNumberOfArgumentsException(this)); |
---|
665 | return args; |
---|
666 | } |
---|
667 | // Not fixed arity. |
---|
668 | if (argsLength < minArgs) |
---|
669 | error(new WrongNumberOfArgumentsException(this)); |
---|
670 | final LispObject[] array = new LispObject[variables.length]; |
---|
671 | int index = 0; |
---|
672 | // The bindings established here (if any) are lost when this function |
---|
673 | // returns. They are used only in the evaluation of initforms for |
---|
674 | // optional and keyword arguments. |
---|
675 | final SpecialBindingsMark mark = thread.markSpecialBindings(); |
---|
676 | Environment ext = new Environment(environment); |
---|
677 | // Section 3.4.4: "...the &environment parameter is bound along with |
---|
678 | // &whole before any other variables in the lambda list..." |
---|
679 | try { |
---|
680 | if (bindInitForms) |
---|
681 | if (envVar != null) |
---|
682 | bindArg(specials, envVar, environment, ext, thread); |
---|
683 | // Required parameters. |
---|
684 | for (int i = 0; i < minArgs; i++) |
---|
685 | { |
---|
686 | if (bindInitForms) |
---|
687 | bindArg(specials, requiredParameters[i].var, args[i], ext, thread); |
---|
688 | array[index++] = args[i]; |
---|
689 | } |
---|
690 | int i = minArgs; |
---|
691 | int argsUsed = minArgs; |
---|
692 | // Optional parameters. |
---|
693 | for (Parameter parameter : optionalParameters) |
---|
694 | { |
---|
695 | if (i < argsLength) |
---|
696 | { |
---|
697 | if (bindInitForms) |
---|
698 | bindArg(specials, parameter.var, args[i], ext, thread); |
---|
699 | array[index++] = args[i]; |
---|
700 | ++argsUsed; |
---|
701 | if (parameter.svar != NIL) |
---|
702 | { |
---|
703 | if (bindInitForms) |
---|
704 | bindArg(specials, (Symbol)parameter.svar, T, ext, thread); |
---|
705 | array[index++] = T; |
---|
706 | } |
---|
707 | } |
---|
708 | else |
---|
709 | { |
---|
710 | // We've run out of arguments. |
---|
711 | LispObject value; |
---|
712 | if (parameter.initVal != null) |
---|
713 | value = parameter.initVal; |
---|
714 | else |
---|
715 | value = eval(parameter.initForm, ext, thread); |
---|
716 | if (bindInitForms) |
---|
717 | bindArg(specials, parameter.var, value, ext, thread); |
---|
718 | array[index++] = value; |
---|
719 | if (parameter.svar != NIL) |
---|
720 | { |
---|
721 | if (bindInitForms) |
---|
722 | bindArg(specials, (Symbol)parameter.svar, NIL, ext, thread); |
---|
723 | array[index++] = NIL; |
---|
724 | } |
---|
725 | } |
---|
726 | ++i; |
---|
727 | } |
---|
728 | // &rest parameter. |
---|
729 | if (restVar != null) |
---|
730 | { |
---|
731 | LispObject rest = NIL; |
---|
732 | for (int j = argsLength; j-- > argsUsed;) |
---|
733 | rest = new Cons(args[j], rest); |
---|
734 | if (bindInitForms) |
---|
735 | bindArg(specials, restVar, rest, ext, thread); |
---|
736 | array[index++] = rest; |
---|
737 | } |
---|
738 | // Keyword parameters. |
---|
739 | if (keywordParameters.length > 0) |
---|
740 | { |
---|
741 | int argsLeft = argsLength - argsUsed; |
---|
742 | if (argsLeft == 0) |
---|
743 | { |
---|
744 | // No keyword arguments were supplied. |
---|
745 | // Bind all keyword parameters to their defaults. |
---|
746 | for (int k = 0; k < keywordParameters.length; k++) |
---|
747 | { |
---|
748 | Parameter parameter = keywordParameters[k]; |
---|
749 | LispObject value; |
---|
750 | if (parameter.initVal != null) |
---|
751 | value = parameter.initVal; |
---|
752 | else |
---|
753 | value = eval(parameter.initForm, ext, thread); |
---|
754 | if (bindInitForms) |
---|
755 | bindArg(specials, parameter.var, value, ext, thread); |
---|
756 | array[index++] = value; |
---|
757 | if (parameter.svar != NIL) |
---|
758 | { |
---|
759 | if (bindInitForms) |
---|
760 | bindArg(specials, (Symbol)parameter.svar, NIL, ext, thread); |
---|
761 | array[index++] = NIL; |
---|
762 | } |
---|
763 | } |
---|
764 | } |
---|
765 | else |
---|
766 | { |
---|
767 | if ((argsLeft % 2) != 0) |
---|
768 | error(new ProgramError("Odd number of keyword arguments.")); |
---|
769 | LispObject allowOtherKeysValue = null; |
---|
770 | for (Parameter parameter : keywordParameters) |
---|
771 | { |
---|
772 | Symbol keyword = parameter.keyword; |
---|
773 | LispObject value = null; |
---|
774 | boolean unbound = true; |
---|
775 | for (int j = argsUsed; j < argsLength; j += 2) |
---|
776 | { |
---|
777 | if (args[j] == keyword) |
---|
778 | { |
---|
779 | if (bindInitForms) |
---|
780 | bindArg(specials, parameter.var, args[j+1], ext, thread); |
---|
781 | value = array[index++] = args[j+1]; |
---|
782 | if (parameter.svar != NIL) |
---|
783 | { |
---|
784 | if (bindInitForms) |
---|
785 | bindArg(specials,(Symbol)parameter.svar, T, ext, thread); |
---|
786 | array[index++] = T; |
---|
787 | } |
---|
788 | args[j] = null; |
---|
789 | args[j+1] = null; |
---|
790 | unbound = false; |
---|
791 | break; |
---|
792 | } |
---|
793 | } |
---|
794 | if (unbound) |
---|
795 | { |
---|
796 | if (parameter.initVal != null) |
---|
797 | value = parameter.initVal; |
---|
798 | else |
---|
799 | value = eval(parameter.initForm, ext, thread); |
---|
800 | if (bindInitForms) |
---|
801 | bindArg(specials, parameter.var, value, ext, thread); |
---|
802 | array[index++] = value; |
---|
803 | if (parameter.svar != NIL) |
---|
804 | { |
---|
805 | if (bindInitForms) |
---|
806 | bindArg(specials, (Symbol)parameter.svar, NIL, ext, thread); |
---|
807 | array[index++] = NIL; |
---|
808 | } |
---|
809 | } |
---|
810 | if (keyword == Keyword.ALLOW_OTHER_KEYS) |
---|
811 | { |
---|
812 | if (allowOtherKeysValue == null) |
---|
813 | allowOtherKeysValue = value; |
---|
814 | } |
---|
815 | } |
---|
816 | if (!allowOtherKeys) |
---|
817 | { |
---|
818 | if (allowOtherKeysValue == null || allowOtherKeysValue == NIL) |
---|
819 | { |
---|
820 | LispObject unrecognizedKeyword = null; |
---|
821 | for (int j = argsUsed; j < argsLength; j += 2) |
---|
822 | { |
---|
823 | LispObject keyword = args[j]; |
---|
824 | if (keyword == null) |
---|
825 | continue; |
---|
826 | if (keyword == Keyword.ALLOW_OTHER_KEYS) |
---|
827 | { |
---|
828 | if (allowOtherKeysValue == null) |
---|
829 | { |
---|
830 | allowOtherKeysValue = args[j+1]; |
---|
831 | if (allowOtherKeysValue != NIL) |
---|
832 | break; |
---|
833 | } |
---|
834 | continue; |
---|
835 | } |
---|
836 | // Unused keyword argument. |
---|
837 | boolean ok = false; |
---|
838 | for (Parameter parameter : keywordParameters) |
---|
839 | { |
---|
840 | if (parameter.keyword == keyword) |
---|
841 | { |
---|
842 | // Found it! |
---|
843 | ok = true; |
---|
844 | break; |
---|
845 | } |
---|
846 | } |
---|
847 | if (ok) |
---|
848 | continue; |
---|
849 | // Unrecognized keyword argument. |
---|
850 | if (unrecognizedKeyword == null) |
---|
851 | unrecognizedKeyword = keyword; |
---|
852 | } |
---|
853 | if (unrecognizedKeyword != null) |
---|
854 | { |
---|
855 | if (!allowOtherKeys && |
---|
856 | (allowOtherKeysValue == null || allowOtherKeysValue == NIL)) |
---|
857 | error(new ProgramError("Unrecognized keyword argument " + |
---|
858 | unrecognizedKeyword.writeToString())); |
---|
859 | } |
---|
860 | } |
---|
861 | } |
---|
862 | } |
---|
863 | } |
---|
864 | else if (argsUsed < argsLength) |
---|
865 | { |
---|
866 | // No keyword parameters. |
---|
867 | if (argsUsed + 2 <= argsLength) |
---|
868 | { |
---|
869 | // Check for :ALLOW-OTHER-KEYS. |
---|
870 | LispObject allowOtherKeysValue = NIL; |
---|
871 | int n = argsUsed; |
---|
872 | while (n < argsLength) |
---|
873 | { |
---|
874 | LispObject keyword = args[n]; |
---|
875 | if (keyword == Keyword.ALLOW_OTHER_KEYS) |
---|
876 | { |
---|
877 | allowOtherKeysValue = args[n+1]; |
---|
878 | break; |
---|
879 | } |
---|
880 | n += 2; |
---|
881 | } |
---|
882 | if (allowOtherKeys || allowOtherKeysValue != NIL) |
---|
883 | { |
---|
884 | // Skip keyword/value pairs. |
---|
885 | while (argsUsed + 2 <= argsLength) |
---|
886 | argsUsed += 2; |
---|
887 | } |
---|
888 | else if (andKey) |
---|
889 | { |
---|
890 | LispObject keyword = args[argsUsed]; |
---|
891 | if (keyword == Keyword.ALLOW_OTHER_KEYS) |
---|
892 | { |
---|
893 | // Section 3.4.1.4: "Note that if &KEY is present, a |
---|
894 | // keyword argument of :ALLOW-OTHER-KEYS is always |
---|
895 | // permitted---regardless of whether the associated |
---|
896 | // value is true or false." |
---|
897 | argsUsed += 2; |
---|
898 | } |
---|
899 | } |
---|
900 | } |
---|
901 | if (argsUsed < argsLength) |
---|
902 | { |
---|
903 | if (restVar == null) |
---|
904 | error(new WrongNumberOfArgumentsException(this)); |
---|
905 | } |
---|
906 | } |
---|
907 | } |
---|
908 | finally { |
---|
909 | thread.resetSpecialBindings(mark); |
---|
910 | } |
---|
911 | return array; |
---|
912 | } |
---|
913 | |
---|
914 | // No optional or keyword parameters. |
---|
915 | protected final LispObject[] fastProcessArgs(LispObject[] args) |
---|
916 | |
---|
917 | { |
---|
918 | final int argsLength = args.length; |
---|
919 | if (arity >= 0) |
---|
920 | { |
---|
921 | // Fixed arity. |
---|
922 | if (argsLength != arity) |
---|
923 | error(new WrongNumberOfArgumentsException(this)); |
---|
924 | return args; |
---|
925 | } |
---|
926 | // Not fixed arity. |
---|
927 | if (argsLength < minArgs) |
---|
928 | error(new WrongNumberOfArgumentsException(this)); |
---|
929 | final LispObject[] array = new LispObject[variables.length]; |
---|
930 | int index = 0; |
---|
931 | // Required parameters. |
---|
932 | for (int i = 0; i < minArgs; i++) |
---|
933 | { |
---|
934 | array[index++] = args[i]; |
---|
935 | } |
---|
936 | int argsUsed = minArgs; |
---|
937 | // &rest parameter. |
---|
938 | if (restVar != null) |
---|
939 | { |
---|
940 | LispObject rest = NIL; |
---|
941 | for (int j = argsLength; j-- > argsUsed;) |
---|
942 | rest = new Cons(args[j], rest); |
---|
943 | array[index++] = rest; |
---|
944 | } |
---|
945 | else if (argsUsed < argsLength) |
---|
946 | { |
---|
947 | // No keyword parameters. |
---|
948 | if (argsUsed + 2 <= argsLength) |
---|
949 | { |
---|
950 | // Check for :ALLOW-OTHER-KEYS. |
---|
951 | LispObject allowOtherKeysValue = NIL; |
---|
952 | int n = argsUsed; |
---|
953 | while (n < argsLength) |
---|
954 | { |
---|
955 | LispObject keyword = args[n]; |
---|
956 | if (keyword == Keyword.ALLOW_OTHER_KEYS) |
---|
957 | { |
---|
958 | allowOtherKeysValue = args[n+1]; |
---|
959 | break; |
---|
960 | } |
---|
961 | n += 2; |
---|
962 | } |
---|
963 | if (allowOtherKeys || allowOtherKeysValue != NIL) |
---|
964 | { |
---|
965 | // Skip keyword/value pairs. |
---|
966 | while (argsUsed + 2 <= argsLength) |
---|
967 | argsUsed += 2; |
---|
968 | } |
---|
969 | else if (andKey) |
---|
970 | { |
---|
971 | LispObject keyword = args[argsUsed]; |
---|
972 | if (keyword == Keyword.ALLOW_OTHER_KEYS) |
---|
973 | { |
---|
974 | // Section 3.4.1.4: "Note that if &key is present, a |
---|
975 | // keyword argument of :allow-other-keys is always |
---|
976 | // permitted---regardless of whether the associated |
---|
977 | // value is true or false." |
---|
978 | argsUsed += 2; |
---|
979 | } |
---|
980 | } |
---|
981 | } |
---|
982 | if (argsUsed < argsLength) |
---|
983 | { |
---|
984 | if (restVar == null) |
---|
985 | error(new WrongNumberOfArgumentsException(this)); |
---|
986 | } |
---|
987 | } |
---|
988 | return array; |
---|
989 | } |
---|
990 | |
---|
991 | private final void bindParameterDefaults(Parameter[] parameters, |
---|
992 | Environment env, |
---|
993 | LispThread thread) |
---|
994 | |
---|
995 | { |
---|
996 | for (Parameter parameter : parameters) |
---|
997 | { |
---|
998 | LispObject value; |
---|
999 | if (parameter.initVal != null) |
---|
1000 | value = parameter.initVal; |
---|
1001 | else |
---|
1002 | value = eval(parameter.initForm, env, thread); |
---|
1003 | bindArg(specials, parameter.var, value, env, thread); |
---|
1004 | if (parameter.svar != NIL) |
---|
1005 | bindArg(specials, (Symbol)parameter.svar, NIL, env, thread); |
---|
1006 | } |
---|
1007 | } |
---|
1008 | |
---|
1009 | private final void bindAuxVars(Environment env, LispThread thread) |
---|
1010 | |
---|
1011 | { |
---|
1012 | // Aux variable processing is analogous to LET* processing. |
---|
1013 | for (Parameter parameter : auxVars) |
---|
1014 | { |
---|
1015 | Symbol sym = parameter.var; |
---|
1016 | LispObject value; |
---|
1017 | |
---|
1018 | if (parameter.initVal != null) |
---|
1019 | value = parameter.initVal; |
---|
1020 | else |
---|
1021 | value = eval(parameter.initForm, env, thread); |
---|
1022 | |
---|
1023 | bindArg(specials, sym, value, env, thread); |
---|
1024 | } |
---|
1025 | } |
---|
1026 | |
---|
1027 | public static class Parameter |
---|
1028 | { |
---|
1029 | final Symbol var; |
---|
1030 | final LispObject initForm; |
---|
1031 | final LispObject initVal; |
---|
1032 | final LispObject svar; |
---|
1033 | private final int type; |
---|
1034 | final Symbol keyword; |
---|
1035 | |
---|
1036 | public Parameter(Symbol var) |
---|
1037 | { |
---|
1038 | this.var = var; |
---|
1039 | this.initForm = null; |
---|
1040 | this.initVal = null; |
---|
1041 | this.svar = NIL; |
---|
1042 | this.type = REQUIRED; |
---|
1043 | this.keyword = null; |
---|
1044 | } |
---|
1045 | |
---|
1046 | public Parameter(Symbol var, LispObject initForm, int type) |
---|
1047 | |
---|
1048 | { |
---|
1049 | this.var = var; |
---|
1050 | this.initForm = initForm; |
---|
1051 | this.initVal = processInitForm(initForm); |
---|
1052 | this.svar = NIL; |
---|
1053 | this.type = type; |
---|
1054 | keyword = |
---|
1055 | type == KEYWORD ? PACKAGE_KEYWORD.intern(var.name) : null; |
---|
1056 | } |
---|
1057 | |
---|
1058 | public Parameter(Symbol var, LispObject initForm, LispObject svar, |
---|
1059 | int type) |
---|
1060 | |
---|
1061 | { |
---|
1062 | this.var = var; |
---|
1063 | this.initForm = initForm; |
---|
1064 | this.initVal = processInitForm(initForm); |
---|
1065 | this.svar = (svar != NIL) ? checkSymbol(svar) : NIL; |
---|
1066 | this.type = type; |
---|
1067 | keyword = |
---|
1068 | type == KEYWORD ? PACKAGE_KEYWORD.intern(var.name) : null; |
---|
1069 | } |
---|
1070 | |
---|
1071 | public Parameter(Symbol keyword, Symbol var, LispObject initForm, |
---|
1072 | LispObject svar) |
---|
1073 | |
---|
1074 | { |
---|
1075 | this.var = var; |
---|
1076 | this.initForm = initForm; |
---|
1077 | this.initVal = processInitForm(initForm); |
---|
1078 | this.svar = (svar != NIL) ? checkSymbol(svar) : NIL; |
---|
1079 | type = KEYWORD; |
---|
1080 | this.keyword = keyword; |
---|
1081 | } |
---|
1082 | |
---|
1083 | @Override |
---|
1084 | public String toString() |
---|
1085 | { |
---|
1086 | if (type == REQUIRED) |
---|
1087 | return var.toString(); |
---|
1088 | StringBuffer sb = new StringBuffer(); |
---|
1089 | if (keyword != null) |
---|
1090 | { |
---|
1091 | sb.append(keyword); |
---|
1092 | sb.append(' '); |
---|
1093 | } |
---|
1094 | sb.append(var.toString()); |
---|
1095 | sb.append(' '); |
---|
1096 | sb.append(initForm); |
---|
1097 | sb.append(' '); |
---|
1098 | sb.append(type); |
---|
1099 | return sb.toString(); |
---|
1100 | } |
---|
1101 | |
---|
1102 | private static final LispObject processInitForm(LispObject initForm) |
---|
1103 | |
---|
1104 | { |
---|
1105 | if (initForm.constantp()) |
---|
1106 | { |
---|
1107 | if (initForm instanceof Symbol) |
---|
1108 | return initForm.getSymbolValue(); |
---|
1109 | if (initForm instanceof Cons) |
---|
1110 | { |
---|
1111 | Debug.assertTrue(initForm.car() == Symbol.QUOTE); |
---|
1112 | return initForm.cadr(); |
---|
1113 | } |
---|
1114 | return initForm; |
---|
1115 | } |
---|
1116 | return null; |
---|
1117 | } |
---|
1118 | } |
---|
1119 | |
---|
1120 | // ### lambda-list-names |
---|
1121 | private static final Primitive LAMBDA_LIST_NAMES = |
---|
1122 | new Primitive("lambda-list-names", PACKAGE_SYS, true) |
---|
1123 | { |
---|
1124 | @Override |
---|
1125 | public LispObject execute(LispObject arg) |
---|
1126 | { |
---|
1127 | Closure closure = new Closure(list(Symbol.LAMBDA, arg, NIL), new Environment()); |
---|
1128 | return closure.getVariableList(); |
---|
1129 | } |
---|
1130 | }; |
---|
1131 | } |
---|