1 | /* |
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2 | * Readtable.java |
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3 | * |
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4 | * Copyright (C) 2003-2007 Peter Graves |
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5 | * $Id: Readtable.java 12254 2009-11-06 20:07:54Z ehuelsmann $ |
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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 | import java.util.Iterator; |
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36 | |
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37 | public class Readtable extends LispObject |
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38 | { |
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39 | public static final byte SYNTAX_TYPE_CONSTITUENT = 0; |
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40 | public static final byte SYNTAX_TYPE_WHITESPACE = 1; |
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41 | public static final byte SYNTAX_TYPE_TERMINATING_MACRO = 2; |
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42 | public static final byte SYNTAX_TYPE_NON_TERMINATING_MACRO = 3; |
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43 | public static final byte SYNTAX_TYPE_SINGLE_ESCAPE = 4; |
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44 | public static final byte SYNTAX_TYPE_MULTIPLE_ESCAPE = 5; |
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45 | |
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46 | protected final CharHashMap<Byte> syntax = new CharHashMap<Byte>(Byte.class,SYNTAX_TYPE_CONSTITUENT); |
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47 | protected final CharHashMap<LispObject> readerMacroFunctions = new CharHashMap<LispObject>(LispObject.class,null); |
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48 | protected final CharHashMap<DispatchTable> dispatchTables = new CharHashMap<DispatchTable>(DispatchTable.class,null); |
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49 | |
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50 | protected LispObject readtableCase; |
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51 | |
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52 | public Readtable() |
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53 | { |
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54 | initialize(); |
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55 | } |
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56 | |
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57 | protected void initialize() |
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58 | { |
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59 | Byte[] syntax = this.syntax.constants; |
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60 | syntax[9] = SYNTAX_TYPE_WHITESPACE; // tab |
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61 | syntax[10] = SYNTAX_TYPE_WHITESPACE; // linefeed |
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62 | syntax[12] = SYNTAX_TYPE_WHITESPACE; // form feed |
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63 | syntax[13] = SYNTAX_TYPE_WHITESPACE; // return |
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64 | syntax[' '] = SYNTAX_TYPE_WHITESPACE; |
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65 | |
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66 | syntax['"'] = SYNTAX_TYPE_TERMINATING_MACRO; |
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67 | syntax['\''] = SYNTAX_TYPE_TERMINATING_MACRO; |
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68 | syntax['('] = SYNTAX_TYPE_TERMINATING_MACRO; |
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69 | syntax[')'] = SYNTAX_TYPE_TERMINATING_MACRO; |
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70 | syntax[','] = SYNTAX_TYPE_TERMINATING_MACRO; |
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71 | syntax[';'] = SYNTAX_TYPE_TERMINATING_MACRO; |
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72 | syntax['`'] = SYNTAX_TYPE_TERMINATING_MACRO; |
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73 | |
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74 | syntax['#'] = SYNTAX_TYPE_NON_TERMINATING_MACRO; |
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75 | |
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76 | syntax['\\'] = SYNTAX_TYPE_SINGLE_ESCAPE; |
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77 | syntax['|'] = SYNTAX_TYPE_MULTIPLE_ESCAPE; |
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78 | |
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79 | LispObject[] readerMacroFunctions = this.readerMacroFunctions.constants; |
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80 | readerMacroFunctions[';'] = LispReader.READ_COMMENT; |
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81 | readerMacroFunctions['"'] = LispReader.READ_STRING; |
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82 | readerMacroFunctions['('] = LispReader.READ_LIST; |
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83 | readerMacroFunctions[')'] = LispReader.READ_RIGHT_PAREN; |
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84 | readerMacroFunctions['\''] = LispReader.READ_QUOTE; |
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85 | readerMacroFunctions['#'] = LispReader.READ_DISPATCH_CHAR; |
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86 | |
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87 | // BACKQUOTE-MACRO and COMMA-MACRO are defined in backquote.lisp. |
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88 | readerMacroFunctions['`'] = Symbol.BACKQUOTE_MACRO; |
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89 | readerMacroFunctions[','] = Symbol.COMMA_MACRO; |
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90 | |
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91 | DispatchTable dt = new DispatchTable(); |
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92 | LispObject[] dtfunctions = dt.functions.constants; |
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93 | dtfunctions['('] = LispReader.SHARP_LEFT_PAREN; |
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94 | dtfunctions['*'] = LispReader.SHARP_STAR; |
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95 | dtfunctions['.'] = LispReader.SHARP_DOT; |
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96 | dtfunctions[':'] = LispReader.SHARP_COLON; |
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97 | dtfunctions['A'] = LispReader.SHARP_A; |
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98 | dtfunctions['B'] = LispReader.SHARP_B; |
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99 | dtfunctions['C'] = LispReader.SHARP_C; |
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100 | dtfunctions['O'] = LispReader.SHARP_O; |
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101 | dtfunctions['P'] = LispReader.SHARP_P; |
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102 | dtfunctions['R'] = LispReader.SHARP_R; |
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103 | dtfunctions['S'] = LispReader.SHARP_S; |
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104 | dtfunctions['X'] = LispReader.SHARP_X; |
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105 | dtfunctions['\''] = LispReader.SHARP_QUOTE; |
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106 | dtfunctions['\\'] = LispReader.SHARP_BACKSLASH; |
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107 | dtfunctions['|'] = LispReader.SHARP_VERTICAL_BAR; |
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108 | dtfunctions[')'] = LispReader.SHARP_ILLEGAL; |
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109 | dtfunctions['<'] = LispReader.SHARP_ILLEGAL; |
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110 | dtfunctions[' '] = LispReader.SHARP_ILLEGAL; |
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111 | dtfunctions[8] = LispReader.SHARP_ILLEGAL; // backspace |
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112 | dtfunctions[9] = LispReader.SHARP_ILLEGAL; // tab |
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113 | dtfunctions[10] = LispReader.SHARP_ILLEGAL; // newline, linefeed |
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114 | dtfunctions[12] = LispReader.SHARP_ILLEGAL; // page |
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115 | dtfunctions[13] = LispReader.SHARP_ILLEGAL; // return |
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116 | |
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117 | dispatchTables.constants['#'] = dt; |
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118 | |
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119 | readtableCase = Keyword.UPCASE; |
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120 | } |
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121 | |
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122 | public Readtable(LispObject obj) |
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123 | { |
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124 | Readtable rt; |
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125 | if (obj == NIL) |
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126 | rt = checkReadtable(STANDARD_READTABLE.symbolValue()); |
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127 | else |
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128 | rt = checkReadtable(obj); |
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129 | synchronized (rt) |
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130 | { |
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131 | copyReadtable(rt, this); |
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132 | } |
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133 | } |
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134 | |
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135 | // FIXME synchronization |
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136 | private static void copyReadtable(Readtable from, Readtable to) |
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137 | { |
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138 | Iterator<Character> charIterator = from.syntax.getCharIterator(); |
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139 | while (charIterator.hasNext()) { |
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140 | char c = charIterator.next(); |
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141 | Byte dt = from.syntax.get(c); |
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142 | if (dt!=null) { |
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143 | to.syntax.put(c, dt); |
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144 | } else { |
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145 | to.syntax.put(c, null); |
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146 | } |
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147 | } |
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148 | charIterator = from.readerMacroFunctions.getCharIterator(); |
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149 | while (charIterator.hasNext()) { |
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150 | char c = charIterator.next(); |
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151 | LispObject dt = from.readerMacroFunctions.get(c); |
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152 | if (dt!=null) { |
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153 | to.readerMacroFunctions.put(c, dt); |
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154 | } else { |
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155 | to.readerMacroFunctions.put(c, null); |
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156 | } |
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157 | } |
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158 | charIterator = from.dispatchTables.getCharIterator(); |
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159 | while (charIterator.hasNext()) { |
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160 | char c = charIterator.next(); |
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161 | DispatchTable dt = from.dispatchTables.get(c); |
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162 | if (dt!=null) { |
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163 | to.dispatchTables.put(c, new DispatchTable(dt)); |
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164 | } else { |
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165 | to.dispatchTables.put(c, null); |
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166 | } |
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167 | } |
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168 | to.readtableCase = from.readtableCase; |
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169 | } |
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170 | |
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171 | @Override |
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172 | public LispObject typeOf() |
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173 | { |
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174 | return Symbol.READTABLE; |
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175 | } |
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176 | |
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177 | @Override |
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178 | public LispObject classOf() |
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179 | { |
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180 | return BuiltInClass.READTABLE; |
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181 | } |
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182 | |
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183 | @Override |
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184 | public LispObject typep(LispObject type) |
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185 | { |
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186 | if (type == Symbol.READTABLE) |
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187 | return T; |
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188 | if (type == BuiltInClass.READTABLE) |
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189 | return T; |
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190 | return super.typep(type); |
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191 | } |
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192 | |
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193 | @Override |
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194 | public String toString() |
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195 | { |
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196 | return unreadableString("READTABLE"); |
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197 | } |
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198 | |
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199 | public LispObject getReadtableCase() |
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200 | { |
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201 | return readtableCase; |
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202 | } |
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203 | |
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204 | public boolean isWhitespace(char c) |
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205 | { |
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206 | return getSyntaxType(c) == SYNTAX_TYPE_WHITESPACE; |
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207 | } |
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208 | |
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209 | public byte getSyntaxType(char c) |
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210 | { |
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211 | return syntax.get(c); |
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212 | } |
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213 | |
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214 | public boolean isInvalid(char c) |
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215 | { |
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216 | switch (c) |
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217 | { |
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218 | case 8: |
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219 | case 9: |
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220 | case 10: |
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221 | case 12: |
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222 | case 13: |
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223 | case 32: |
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224 | case 127: |
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225 | return true; |
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226 | default: |
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227 | return false; |
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228 | } |
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229 | } |
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230 | |
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231 | public void checkInvalid(char c, Stream stream) |
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232 | { |
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233 | // "... no mechanism is provided for changing the constituent trait of a |
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234 | // character." (2.1.4.2) |
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235 | if (isInvalid(c)) |
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236 | { |
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237 | String name = LispCharacter.charToName(c); |
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238 | FastStringBuffer sb = new FastStringBuffer("Invalid character"); |
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239 | if (name != null) |
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240 | { |
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241 | sb.append(" #\\"); |
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242 | sb.append(name); |
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243 | } |
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244 | error(new ReaderError(sb.toString(), stream)); |
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245 | } |
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246 | } |
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247 | |
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248 | public LispObject getReaderMacroFunction(char c) |
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249 | { |
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250 | return readerMacroFunctions.get(c); |
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251 | } |
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252 | |
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253 | private LispObject getMacroCharacter(char c) |
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254 | { |
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255 | LispObject function = getReaderMacroFunction(c); |
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256 | LispObject non_terminating_p; |
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257 | if (function != null) |
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258 | { |
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259 | if (syntax.get(c) == SYNTAX_TYPE_NON_TERMINATING_MACRO) |
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260 | non_terminating_p = T; |
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261 | else |
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262 | non_terminating_p = NIL; |
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263 | } |
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264 | else |
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265 | { |
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266 | function = NIL; |
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267 | non_terminating_p = NIL; |
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268 | } |
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269 | return LispThread.currentThread().setValues(function, non_terminating_p); |
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270 | } |
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271 | |
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272 | private void makeDispatchMacroCharacter(char dispChar, LispObject non_terminating_p) |
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273 | { |
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274 | byte syntaxType; |
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275 | if (non_terminating_p != NIL) |
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276 | syntaxType = SYNTAX_TYPE_NON_TERMINATING_MACRO; |
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277 | else |
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278 | syntaxType = SYNTAX_TYPE_TERMINATING_MACRO; |
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279 | // FIXME synchronization |
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280 | syntax.put(dispChar,syntaxType); |
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281 | readerMacroFunctions.put(dispChar, LispReader.READ_DISPATCH_CHAR); |
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282 | dispatchTables.put(dispChar, new DispatchTable()); |
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283 | } |
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284 | |
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285 | public LispObject getDispatchMacroCharacter(char dispChar, char subChar) |
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286 | |
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287 | { |
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288 | DispatchTable dispatchTable = dispatchTables.get(dispChar); |
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289 | if (dispatchTable == null) |
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290 | { |
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291 | LispCharacter c = LispCharacter.getInstance(dispChar); |
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292 | return error(new LispError(c.writeToString() + |
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293 | " is not a dispatch character.")); |
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294 | } |
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295 | LispObject function = |
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296 | dispatchTable.functions.get(LispCharacter.toUpperCase(subChar)); |
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297 | return (function != null) ? function : NIL; |
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298 | } |
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299 | |
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300 | public void setDispatchMacroCharacter(char dispChar, char subChar, |
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301 | LispObject function) |
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302 | |
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303 | { |
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304 | DispatchTable dispatchTable = dispatchTables.get(dispChar); |
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305 | if (dispatchTable == null) |
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306 | { |
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307 | LispCharacter c = LispCharacter.getInstance(dispChar); |
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308 | error(new LispError(c.writeToString() + |
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309 | " is not a dispatch character.")); |
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310 | } |
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311 | dispatchTable.functions.put(LispCharacter.toUpperCase(subChar), function); |
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312 | } |
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313 | |
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314 | protected static class DispatchTable |
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315 | { |
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316 | protected final CharHashMap<LispObject> functions; |
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317 | |
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318 | public DispatchTable() |
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319 | { |
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320 | functions = new CharHashMap<LispObject>(LispObject.class,null); |
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321 | } |
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322 | |
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323 | @SuppressWarnings("unchecked") |
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324 | public DispatchTable(DispatchTable dt) |
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325 | { |
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326 | functions = (CharHashMap<LispObject>) dt.functions.clone(); |
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327 | } |
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328 | } |
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329 | |
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330 | // ### readtablep |
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331 | private static final Primitive READTABLEP = |
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332 | new Primitive("readtablep", "object") |
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333 | { |
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334 | @Override |
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335 | public LispObject execute(LispObject arg) |
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336 | { |
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337 | return arg instanceof Readtable ? T : NIL; |
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338 | } |
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339 | }; |
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340 | |
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341 | // ### copy-readtable |
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342 | private static final Primitive COPY_READTABLE = |
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343 | new Primitive("copy-readtable", "&optional from-readtable to-readtable") |
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344 | { |
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345 | @Override |
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346 | public LispObject execute() |
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347 | { |
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348 | return new Readtable(currentReadtable()); |
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349 | } |
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350 | |
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351 | @Override |
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352 | public LispObject execute(LispObject arg) |
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353 | { |
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354 | return new Readtable(arg); |
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355 | } |
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356 | |
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357 | @Override |
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358 | public LispObject execute(LispObject first, LispObject second) |
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359 | |
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360 | { |
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361 | Readtable from = designator_readtable(first); |
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362 | if (second == NIL) |
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363 | return new Readtable(from); |
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364 | Readtable to = checkReadtable(second); |
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365 | copyReadtable(from, to); |
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366 | return to; |
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367 | } |
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368 | }; |
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369 | |
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370 | // ### get-macro-character char &optional readtable |
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371 | // => function, non-terminating-p |
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372 | private static final Primitive GET_MACRO_CHARACTER = |
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373 | new Primitive("get-macro-character", "char &optional readtable") |
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374 | { |
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375 | @Override |
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376 | public LispObject execute(LispObject arg) |
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377 | { |
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378 | char c = LispCharacter.getValue(arg); |
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379 | Readtable rt = currentReadtable(); |
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380 | return rt.getMacroCharacter(c); |
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381 | } |
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382 | |
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383 | @Override |
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384 | public LispObject execute(LispObject first, LispObject second) |
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385 | |
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386 | { |
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387 | char c = LispCharacter.getValue(first); |
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388 | Readtable rt = designator_readtable(second); |
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389 | return rt.getMacroCharacter(c); |
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390 | } |
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391 | }; |
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392 | |
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393 | // ### set-macro-character char new-function &optional non-terminating-p readtable |
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394 | // => t |
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395 | private static final Primitive SET_MACRO_CHARACTER = |
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396 | new Primitive("set-macro-character", |
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397 | "char new-function &optional non-terminating-p readtable") |
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398 | { |
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399 | @Override |
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400 | public LispObject execute(LispObject first, LispObject second) |
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401 | |
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402 | { |
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403 | return execute(first, second, NIL, currentReadtable()); |
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404 | } |
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405 | |
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406 | @Override |
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407 | public LispObject execute(LispObject first, LispObject second, |
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408 | LispObject third) |
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409 | |
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410 | { |
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411 | return execute(first, second, third, currentReadtable()); |
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412 | } |
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413 | |
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414 | @Override |
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415 | public LispObject execute(LispObject first, LispObject second, |
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416 | LispObject third, LispObject fourth) |
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417 | |
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418 | { |
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419 | char c = LispCharacter.getValue(first); |
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420 | final LispObject designator; |
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421 | if (second instanceof Function |
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422 | || second instanceof StandardGenericFunction) |
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423 | designator = second; |
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424 | else if (second instanceof Symbol) |
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425 | designator = second; |
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426 | else |
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427 | return error(new LispError(second.writeToString() + |
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428 | " does not designate a function.")); |
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429 | byte syntaxType; |
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430 | if (third != NIL) |
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431 | syntaxType = SYNTAX_TYPE_NON_TERMINATING_MACRO; |
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432 | else |
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433 | syntaxType = SYNTAX_TYPE_TERMINATING_MACRO; |
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434 | Readtable rt = designator_readtable(fourth); |
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435 | // REVIEW synchronization |
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436 | rt.syntax.put(c, syntaxType); |
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437 | rt.readerMacroFunctions.put(c, designator); |
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438 | return T; |
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439 | } |
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440 | }; |
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441 | |
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442 | // ### make-dispatch-macro-character char &optional non-terminating-p readtable |
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443 | // => t |
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444 | private static final Primitive MAKE_DISPATCH_MACRO_CHARACTER = |
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445 | new Primitive("make-dispatch-macro-character", |
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446 | "char &optional non-terminating-p readtable") |
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447 | { |
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448 | @Override |
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449 | public LispObject execute(LispObject[] args) |
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450 | { |
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451 | if (args.length < 1 || args.length > 3) |
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452 | return error(new WrongNumberOfArgumentsException(this)); |
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453 | char dispChar = LispCharacter.getValue(args[0]); |
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454 | LispObject non_terminating_p; |
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455 | if (args.length > 1) |
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456 | non_terminating_p = args[1]; |
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457 | else |
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458 | non_terminating_p = NIL; |
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459 | Readtable readtable; |
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460 | if (args.length == 3) |
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461 | readtable = checkReadtable(args[2]); |
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462 | else |
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463 | readtable = currentReadtable(); |
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464 | readtable.makeDispatchMacroCharacter(dispChar, non_terminating_p); |
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465 | return T; |
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466 | } |
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467 | }; |
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468 | |
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469 | // ### get-dispatch-macro-character disp-char sub-char &optional readtable |
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470 | // => function |
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471 | private static final Primitive GET_DISPATCH_MACRO_CHARACTER = |
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472 | new Primitive("get-dispatch-macro-character", |
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473 | "disp-char sub-char &optional readtable") |
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474 | { |
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475 | @Override |
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476 | public LispObject execute(LispObject[] args) |
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477 | { |
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478 | if (args.length < 2 || args.length > 3) |
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479 | return error(new WrongNumberOfArgumentsException(this)); |
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480 | char dispChar = LispCharacter.getValue(args[0]); |
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481 | char subChar = LispCharacter.getValue(args[1]); |
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482 | Readtable readtable; |
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483 | if (args.length == 3) |
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484 | readtable = designator_readtable(args[2]); |
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485 | else |
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486 | readtable = currentReadtable(); |
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487 | return readtable.getDispatchMacroCharacter(dispChar, subChar); |
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488 | } |
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489 | }; |
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490 | |
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491 | // ### set-dispatch-macro-character disp-char sub-char new-function &optional readtable |
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492 | // => t |
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493 | private static final Primitive SET_DISPATCH_MACRO_CHARACTER = |
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494 | new Primitive("set-dispatch-macro-character", |
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495 | "disp-char sub-char new-function &optional readtable") |
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496 | { |
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497 | @Override |
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498 | public LispObject execute(LispObject[] args) |
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499 | { |
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500 | if (args.length < 3 || args.length > 4) |
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501 | return error(new WrongNumberOfArgumentsException(this)); |
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502 | char dispChar = LispCharacter.getValue(args[0]); |
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503 | char subChar = LispCharacter.getValue(args[1]); |
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504 | LispObject function = coerceToFunction(args[2]); |
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505 | Readtable readtable; |
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506 | if (args.length == 4) |
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507 | readtable = designator_readtable(args[3]); |
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508 | else |
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509 | readtable = currentReadtable(); |
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510 | readtable.setDispatchMacroCharacter(dispChar, subChar, function); |
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511 | return T; |
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512 | } |
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513 | }; |
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514 | |
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515 | // ### set-syntax-from-char to-char from-char &optional to-readtable from-readtable |
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516 | // => t |
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517 | private static final Primitive SET_SYNTAX_FROM_CHAR = |
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518 | new Primitive("set-syntax-from-char", |
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519 | "to-char from-char &optional to-readtable from-readtable") |
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520 | { |
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521 | @Override |
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522 | public LispObject execute(LispObject[] args) |
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523 | { |
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524 | if (args.length < 2 || args.length > 4) |
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525 | return error(new WrongNumberOfArgumentsException(this)); |
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526 | char toChar = LispCharacter.getValue(args[0]); |
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527 | char fromChar = LispCharacter.getValue(args[1]); |
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528 | Readtable toReadtable; |
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529 | if (args.length > 2) |
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530 | toReadtable = checkReadtable(args[2]); |
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531 | else |
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532 | toReadtable = currentReadtable(); |
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533 | Readtable fromReadtable; |
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534 | if (args.length > 3) |
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535 | fromReadtable = designator_readtable(args[3]); |
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536 | else |
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537 | fromReadtable = checkReadtable(STANDARD_READTABLE.symbolValue()); |
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538 | // REVIEW synchronization |
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539 | toReadtable.syntax.put(toChar, fromReadtable.syntax.get(fromChar)); |
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540 | toReadtable.readerMacroFunctions.put(toChar, |
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541 | fromReadtable.readerMacroFunctions.get(fromChar)); |
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542 | // "If the character is a dispatching macro character, its entire |
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543 | // dispatch table of reader macro functions is copied." |
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544 | DispatchTable found = fromReadtable.dispatchTables.get(fromChar); |
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545 | if (found!=null) |
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546 | toReadtable.dispatchTables.put(toChar, new DispatchTable(found)); |
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547 | else |
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548 | // Don't leave behind dispatch tables when fromChar |
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549 | // doesn't have one |
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550 | toReadtable.dispatchTables.put(toChar, null); |
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551 | return T; |
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552 | } |
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553 | }; |
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554 | |
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555 | // ### readtable-case readtable => mode |
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556 | private static final Primitive READTABLE_CASE = |
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557 | new Primitive("readtable-case", "readtable") |
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558 | { |
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559 | @Override |
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560 | public LispObject execute(LispObject arg) |
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561 | { |
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562 | return checkReadtable(arg).readtableCase; |
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563 | } |
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564 | }; |
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565 | |
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566 | // ### %set-readtable-case readtable new-mode => new-mode |
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567 | private static final Primitive _SET_READTABLE_CASE = |
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568 | new Primitive("%set-readtable-case", PACKAGE_SYS, false, |
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569 | "readtable new-mode") |
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570 | { |
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571 | @Override |
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572 | public LispObject execute(LispObject first, LispObject second) |
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573 | |
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574 | { |
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575 | final Readtable readtable = checkReadtable(first); |
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576 | if (second == Keyword.UPCASE || second == Keyword.DOWNCASE || |
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577 | second == Keyword.INVERT || second == Keyword.PRESERVE) |
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578 | { |
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579 | readtable.readtableCase = second; |
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580 | return second; |
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581 | } |
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582 | return type_error(second, list(Symbol.MEMBER, |
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583 | Keyword.INVERT, |
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584 | Keyword.PRESERVE, |
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585 | Keyword.DOWNCASE, |
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586 | Keyword.UPCASE)); |
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587 | } |
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588 | }; |
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589 | } |
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