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 12749 2010-06-09 11:27:42Z mevenson $ |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU General Public License |
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9 | * as published by the Free Software Foundation; either version 2 |
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10 | * of the License, or (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 | * |
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21 | * As a special exception, the copyright holders of this library give you |
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22 | * permission to link this library with independent modules to produce an |
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23 | * executable, regardless of the license terms of these independent |
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24 | * modules, and to copy and distribute the resulting executable under |
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25 | * terms of your choice, provided that you also meet, for each linked |
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26 | * independent module, the terms and conditions of the license of that |
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27 | * module. An independent module is a module which is not derived from |
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28 | * or based on this library. If you modify this library, you may extend |
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29 | * this exception to your version of the library, but you are not |
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30 | * obligated to do so. If you do not wish to do so, delete this |
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31 | * exception statement from your version. |
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32 | */ |
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33 | |
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34 | package org.armedbear.lisp; |
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35 | |
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36 | import static org.armedbear.lisp.Lisp.*; |
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37 | import java.util.Iterator; |
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38 | |
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39 | public class Readtable extends LispObject |
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40 | { |
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41 | public static final byte SYNTAX_TYPE_CONSTITUENT = 0; |
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42 | public static final byte SYNTAX_TYPE_WHITESPACE = 1; |
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43 | public static final byte SYNTAX_TYPE_TERMINATING_MACRO = 2; |
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44 | public static final byte SYNTAX_TYPE_NON_TERMINATING_MACRO = 3; |
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45 | public static final byte SYNTAX_TYPE_SINGLE_ESCAPE = 4; |
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46 | public static final byte SYNTAX_TYPE_MULTIPLE_ESCAPE = 5; |
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47 | |
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48 | protected final CharHashMap<Byte> syntax = new CharHashMap<Byte>(Byte.class,SYNTAX_TYPE_CONSTITUENT); |
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49 | protected final CharHashMap<LispObject> readerMacroFunctions = new CharHashMap<LispObject>(LispObject.class,null); |
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50 | protected final CharHashMap<DispatchTable> dispatchTables = new CharHashMap<DispatchTable>(DispatchTable.class,null); |
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51 | |
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52 | protected LispObject readtableCase; |
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53 | |
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54 | public Readtable() |
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55 | { |
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56 | initialize(); |
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57 | } |
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58 | |
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59 | protected void initialize() |
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60 | { |
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61 | Byte[] syntax = this.syntax.constants; |
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62 | syntax[9] = SYNTAX_TYPE_WHITESPACE; // tab |
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63 | syntax[10] = SYNTAX_TYPE_WHITESPACE; // linefeed |
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64 | syntax[12] = SYNTAX_TYPE_WHITESPACE; // form feed |
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65 | syntax[13] = SYNTAX_TYPE_WHITESPACE; // return |
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66 | syntax[' '] = SYNTAX_TYPE_WHITESPACE; |
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67 | |
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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 | syntax[';'] = SYNTAX_TYPE_TERMINATING_MACRO; |
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74 | syntax['`'] = SYNTAX_TYPE_TERMINATING_MACRO; |
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75 | |
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76 | syntax['#'] = SYNTAX_TYPE_NON_TERMINATING_MACRO; |
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77 | |
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78 | syntax['\\'] = SYNTAX_TYPE_SINGLE_ESCAPE; |
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79 | syntax['|'] = SYNTAX_TYPE_MULTIPLE_ESCAPE; |
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80 | |
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81 | LispObject[] readerMacroFunctions = this.readerMacroFunctions.constants; |
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82 | readerMacroFunctions[';'] = LispReader.READ_COMMENT; |
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83 | readerMacroFunctions['"'] = LispReader.READ_STRING; |
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84 | readerMacroFunctions['('] = LispReader.READ_LIST; |
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85 | readerMacroFunctions[')'] = LispReader.READ_RIGHT_PAREN; |
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86 | readerMacroFunctions['\''] = LispReader.READ_QUOTE; |
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87 | readerMacroFunctions['#'] = LispReader.READ_DISPATCH_CHAR; |
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88 | |
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89 | // BACKQUOTE-MACRO and COMMA-MACRO are defined in backquote.lisp. |
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90 | readerMacroFunctions['`'] = Symbol.BACKQUOTE_MACRO; |
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91 | readerMacroFunctions[','] = Symbol.COMMA_MACRO; |
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92 | |
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93 | DispatchTable dt = new DispatchTable(); |
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94 | LispObject[] dtfunctions = dt.functions.constants; |
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95 | dtfunctions['('] = LispReader.SHARP_LEFT_PAREN; |
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96 | dtfunctions['*'] = LispReader.SHARP_STAR; |
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97 | dtfunctions['.'] = LispReader.SHARP_DOT; |
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98 | dtfunctions[':'] = LispReader.SHARP_COLON; |
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99 | dtfunctions['A'] = LispReader.SHARP_A; |
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100 | dtfunctions['B'] = LispReader.SHARP_B; |
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101 | dtfunctions['C'] = LispReader.SHARP_C; |
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102 | dtfunctions['O'] = LispReader.SHARP_O; |
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103 | dtfunctions['P'] = LispReader.SHARP_P; |
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104 | dtfunctions['R'] = LispReader.SHARP_R; |
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105 | dtfunctions['S'] = LispReader.SHARP_S; |
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106 | dtfunctions['X'] = LispReader.SHARP_X; |
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107 | dtfunctions['\''] = LispReader.SHARP_QUOTE; |
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108 | dtfunctions['\\'] = LispReader.SHARP_BACKSLASH; |
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109 | dtfunctions['|'] = LispReader.SHARP_VERTICAL_BAR; |
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110 | dtfunctions[')'] = LispReader.SHARP_ILLEGAL; |
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111 | dtfunctions['<'] = LispReader.SHARP_ILLEGAL; |
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112 | dtfunctions[' '] = LispReader.SHARP_ILLEGAL; |
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113 | dtfunctions[8] = LispReader.SHARP_ILLEGAL; // backspace |
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114 | dtfunctions[9] = LispReader.SHARP_ILLEGAL; // tab |
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115 | dtfunctions[10] = LispReader.SHARP_ILLEGAL; // newline, linefeed |
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116 | dtfunctions[12] = LispReader.SHARP_ILLEGAL; // page |
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117 | dtfunctions[13] = LispReader.SHARP_ILLEGAL; // return |
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118 | |
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119 | dispatchTables.constants['#'] = dt; |
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120 | |
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121 | readtableCase = Keyword.UPCASE; |
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122 | } |
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123 | |
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124 | public Readtable(LispObject obj) |
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125 | { |
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126 | Readtable rt; |
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127 | if (obj == NIL) |
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128 | rt = checkReadtable(STANDARD_READTABLE.symbolValue()); |
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129 | else |
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130 | rt = checkReadtable(obj); |
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131 | synchronized (rt) |
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132 | { |
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133 | copyReadtable(rt, this); |
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134 | } |
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135 | } |
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136 | |
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137 | // FIXME synchronization |
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138 | static void copyReadtable(Readtable from, Readtable to) |
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139 | { |
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140 | Iterator<Character> charIterator = from.syntax.getCharIterator(); |
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141 | while (charIterator.hasNext()) { |
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142 | char c = charIterator.next(); |
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143 | Byte dt = from.syntax.get(c); |
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144 | if (dt!=null) { |
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145 | to.syntax.put(c, dt); |
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146 | } else { |
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147 | to.syntax.put(c, null); |
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148 | } |
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149 | } |
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150 | charIterator = from.readerMacroFunctions.getCharIterator(); |
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151 | while (charIterator.hasNext()) { |
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152 | char c = charIterator.next(); |
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153 | LispObject dt = from.readerMacroFunctions.get(c); |
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154 | if (dt!=null) { |
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155 | to.readerMacroFunctions.put(c, dt); |
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156 | } else { |
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157 | to.readerMacroFunctions.put(c, null); |
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158 | } |
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159 | } |
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160 | charIterator = from.dispatchTables.getCharIterator(); |
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161 | while (charIterator.hasNext()) { |
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162 | char c = charIterator.next(); |
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163 | DispatchTable dt = from.dispatchTables.get(c); |
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164 | if (dt!=null) { |
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165 | to.dispatchTables.put(c, new DispatchTable(dt)); |
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166 | } else { |
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167 | to.dispatchTables.put(c, null); |
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168 | } |
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169 | } |
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170 | to.readtableCase = from.readtableCase; |
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171 | } |
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172 | |
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173 | @Override |
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174 | public final LispObject typeOf() |
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175 | { |
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176 | return Symbol.READTABLE; |
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177 | } |
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178 | |
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179 | @Override |
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180 | public final LispObject classOf() |
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181 | { |
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182 | return BuiltInClass.READTABLE; |
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183 | } |
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184 | |
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185 | @Override |
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186 | public final LispObject typep(LispObject type) |
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187 | { |
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188 | if (type == Symbol.READTABLE) |
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189 | return T; |
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190 | if (type == BuiltInClass.READTABLE) |
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191 | return T; |
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192 | return super.typep(type); |
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193 | } |
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194 | |
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195 | @Override |
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196 | public final String toString() |
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197 | { |
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198 | return unreadableString("READTABLE"); |
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199 | } |
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200 | |
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201 | public final LispObject getReadtableCase() |
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202 | { |
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203 | return readtableCase; |
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204 | } |
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205 | |
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206 | public final boolean isWhitespace(char c) |
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207 | { |
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208 | return getSyntaxType(c) == SYNTAX_TYPE_WHITESPACE; |
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209 | } |
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210 | |
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211 | public final byte getSyntaxType(char c) |
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212 | { |
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213 | return syntax.get(c); |
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214 | } |
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215 | |
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216 | public final boolean isInvalid(char c) |
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217 | { |
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218 | switch (c) |
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219 | { |
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220 | case 8: |
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221 | case 9: |
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222 | case 10: |
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223 | case 12: |
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224 | case 13: |
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225 | case 32: |
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226 | case 127: |
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227 | return true; |
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228 | default: |
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229 | return false; |
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230 | } |
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231 | } |
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232 | |
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233 | public final void checkInvalid(char c, Stream stream) |
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234 | { |
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235 | // "... no mechanism is provided for changing the constituent trait of a |
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236 | // character." (2.1.4.2) |
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237 | if (isInvalid(c)) |
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238 | { |
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239 | String name = LispCharacter.charToName(c); |
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240 | StringBuilder sb = new StringBuilder("Invalid character"); |
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241 | if (name != null) |
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242 | { |
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243 | sb.append(" #\\"); |
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244 | sb.append(name); |
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245 | } |
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246 | error(new ReaderError(sb.toString(), stream)); |
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247 | } |
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248 | } |
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249 | |
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250 | public final LispObject getReaderMacroFunction(char c) |
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251 | { |
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252 | return readerMacroFunctions.get(c); |
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253 | } |
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254 | |
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255 | final LispObject getMacroCharacter(char c) |
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256 | { |
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257 | LispObject function = getReaderMacroFunction(c); |
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258 | LispObject non_terminating_p; |
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259 | if (function != null) |
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260 | { |
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261 | if (syntax.get(c) == SYNTAX_TYPE_NON_TERMINATING_MACRO) |
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262 | non_terminating_p = T; |
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263 | else |
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264 | non_terminating_p = NIL; |
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265 | } |
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266 | else |
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267 | { |
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268 | function = NIL; |
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269 | non_terminating_p = NIL; |
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270 | } |
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271 | return LispThread.currentThread().setValues(function, non_terminating_p); |
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272 | } |
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273 | |
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274 | final void makeDispatchMacroCharacter(char dispChar, LispObject non_terminating_p) |
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275 | { |
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276 | byte syntaxType; |
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277 | if (non_terminating_p != NIL) |
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278 | syntaxType = SYNTAX_TYPE_NON_TERMINATING_MACRO; |
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279 | else |
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280 | syntaxType = SYNTAX_TYPE_TERMINATING_MACRO; |
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281 | // FIXME synchronization |
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282 | syntax.put(dispChar,syntaxType); |
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283 | readerMacroFunctions.put(dispChar, LispReader.READ_DISPATCH_CHAR); |
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284 | dispatchTables.put(dispChar, new DispatchTable()); |
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285 | } |
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286 | |
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287 | public final LispObject getDispatchMacroCharacter(char dispChar, char subChar) |
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288 | |
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289 | { |
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290 | DispatchTable dispatchTable = dispatchTables.get(dispChar); |
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291 | if (dispatchTable == null) |
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292 | { |
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293 | LispCharacter c = LispCharacter.getInstance(dispChar); |
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294 | return error(new LispError(c.writeToString() + |
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295 | " is not a dispatch character.")); |
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296 | } |
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297 | LispObject function = |
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298 | dispatchTable.functions.get(LispCharacter.toUpperCase(subChar)); |
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299 | return (function != null) ? function : NIL; |
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300 | } |
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301 | |
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302 | public final void setDispatchMacroCharacter(char dispChar, char subChar, |
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303 | LispObject function) |
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304 | |
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305 | { |
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306 | DispatchTable dispatchTable = dispatchTables.get(dispChar); |
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307 | if (dispatchTable == null) |
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308 | { |
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309 | LispCharacter c = LispCharacter.getInstance(dispChar); |
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310 | error(new LispError(c.writeToString() + |
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311 | " is not a dispatch character.")); |
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312 | } |
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313 | dispatchTable.functions.put(LispCharacter.toUpperCase(subChar), function); |
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314 | } |
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315 | |
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316 | protected static class DispatchTable |
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317 | { |
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318 | protected final CharHashMap<LispObject> functions; |
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319 | |
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320 | public DispatchTable() |
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321 | { |
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322 | functions = new CharHashMap<LispObject>(LispObject.class,null); |
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323 | } |
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324 | |
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325 | @SuppressWarnings("unchecked") |
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326 | public DispatchTable(DispatchTable dt) |
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327 | { |
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328 | functions = (CharHashMap<LispObject>) dt.functions.clone(); |
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329 | } |
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330 | } |
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331 | |
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332 | // ### readtablep |
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333 | private static final Primitive READTABLEP = |
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334 | new Primitive("readtablep", "object") |
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335 | { |
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336 | @Override |
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337 | public LispObject execute(LispObject arg) |
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338 | { |
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339 | return arg instanceof Readtable ? T : NIL; |
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340 | } |
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341 | }; |
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342 | |
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343 | // ### copy-readtable |
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344 | private static final Primitive COPY_READTABLE = |
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345 | new Primitive("copy-readtable", "&optional from-readtable to-readtable") |
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346 | { |
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347 | @Override |
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348 | public LispObject execute() |
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349 | { |
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350 | return new Readtable(currentReadtable()); |
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351 | } |
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352 | |
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353 | @Override |
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354 | public LispObject execute(LispObject arg) |
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355 | { |
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356 | return new Readtable(arg); |
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357 | } |
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358 | |
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359 | @Override |
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360 | public LispObject execute(LispObject first, LispObject second) |
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361 | |
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362 | { |
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363 | Readtable from = designator_readtable(first); |
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364 | if (second == NIL) |
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365 | return new Readtable(from); |
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366 | Readtable to = checkReadtable(second); |
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367 | copyReadtable(from, to); |
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368 | return to; |
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369 | } |
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370 | }; |
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371 | |
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372 | // ### get-macro-character char &optional readtable |
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373 | // => function, non-terminating-p |
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374 | private static final Primitive GET_MACRO_CHARACTER = |
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375 | new Primitive("get-macro-character", "char &optional readtable") |
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376 | { |
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377 | @Override |
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378 | public LispObject execute(LispObject arg) |
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379 | { |
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380 | char c = LispCharacter.getValue(arg); |
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381 | Readtable rt = currentReadtable(); |
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382 | return rt.getMacroCharacter(c); |
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383 | } |
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384 | |
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385 | @Override |
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386 | public LispObject execute(LispObject first, LispObject second) |
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387 | |
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388 | { |
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389 | char c = LispCharacter.getValue(first); |
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390 | Readtable rt = designator_readtable(second); |
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391 | return rt.getMacroCharacter(c); |
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392 | } |
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393 | }; |
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394 | |
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395 | // ### set-macro-character char new-function &optional non-terminating-p readtable |
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396 | // => t |
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397 | private static final Primitive SET_MACRO_CHARACTER = |
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398 | new Primitive("set-macro-character", |
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399 | "char new-function &optional non-terminating-p readtable") |
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400 | { |
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401 | @Override |
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402 | public LispObject execute(LispObject first, LispObject second) |
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403 | |
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404 | { |
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405 | return execute(first, second, NIL, currentReadtable()); |
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406 | } |
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407 | |
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408 | @Override |
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409 | public LispObject execute(LispObject first, LispObject second, |
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410 | LispObject third) |
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411 | |
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412 | { |
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413 | return execute(first, second, third, currentReadtable()); |
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414 | } |
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415 | |
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416 | @Override |
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417 | public LispObject execute(LispObject first, LispObject second, |
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418 | LispObject third, LispObject fourth) |
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419 | |
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420 | { |
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421 | char c = LispCharacter.getValue(first); |
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422 | final LispObject designator; |
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423 | if (second instanceof Function |
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424 | || second instanceof StandardGenericFunction) |
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425 | designator = second; |
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426 | else if (second instanceof Symbol) |
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427 | designator = second; |
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428 | else |
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429 | return error(new LispError(second.writeToString() + |
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430 | " does not designate a function.")); |
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431 | byte syntaxType; |
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432 | if (third != NIL) |
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433 | syntaxType = SYNTAX_TYPE_NON_TERMINATING_MACRO; |
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434 | else |
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435 | syntaxType = SYNTAX_TYPE_TERMINATING_MACRO; |
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436 | Readtable rt = designator_readtable(fourth); |
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437 | // REVIEW synchronization |
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438 | rt.syntax.put(c, syntaxType); |
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439 | rt.readerMacroFunctions.put(c, designator); |
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440 | return T; |
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441 | } |
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442 | }; |
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443 | |
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444 | // ### make-dispatch-macro-character char &optional non-terminating-p readtable |
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445 | // => t |
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446 | private static final Primitive MAKE_DISPATCH_MACRO_CHARACTER = |
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447 | new Primitive("make-dispatch-macro-character", |
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448 | "char &optional non-terminating-p readtable") |
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449 | { |
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450 | @Override |
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451 | public LispObject execute(LispObject[] args) |
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452 | { |
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453 | if (args.length < 1 || args.length > 3) |
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454 | return error(new WrongNumberOfArgumentsException(this)); |
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455 | char dispChar = LispCharacter.getValue(args[0]); |
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456 | LispObject non_terminating_p; |
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457 | if (args.length > 1) |
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458 | non_terminating_p = args[1]; |
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459 | else |
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460 | non_terminating_p = NIL; |
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461 | Readtable readtable; |
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462 | if (args.length == 3) |
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463 | readtable = checkReadtable(args[2]); |
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464 | else |
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465 | readtable = currentReadtable(); |
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466 | readtable.makeDispatchMacroCharacter(dispChar, non_terminating_p); |
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467 | return T; |
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468 | } |
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469 | }; |
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470 | |
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471 | // ### get-dispatch-macro-character disp-char sub-char &optional readtable |
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472 | // => function |
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473 | private static final Primitive GET_DISPATCH_MACRO_CHARACTER = |
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474 | new Primitive("get-dispatch-macro-character", |
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475 | "disp-char sub-char &optional readtable") |
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476 | { |
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477 | @Override |
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478 | public LispObject execute(LispObject[] args) |
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479 | { |
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480 | if (args.length < 2 || args.length > 3) |
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481 | return error(new WrongNumberOfArgumentsException(this)); |
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482 | char dispChar = LispCharacter.getValue(args[0]); |
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483 | char subChar = LispCharacter.getValue(args[1]); |
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484 | Readtable readtable; |
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485 | if (args.length == 3) |
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486 | readtable = designator_readtable(args[2]); |
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487 | else |
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488 | readtable = currentReadtable(); |
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489 | return readtable.getDispatchMacroCharacter(dispChar, subChar); |
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490 | } |
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491 | }; |
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492 | |
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493 | // ### set-dispatch-macro-character disp-char sub-char new-function &optional readtable |
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494 | // => t |
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495 | private static final Primitive SET_DISPATCH_MACRO_CHARACTER = |
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496 | new Primitive("set-dispatch-macro-character", |
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497 | "disp-char sub-char new-function &optional readtable") |
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498 | { |
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499 | @Override |
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500 | public LispObject execute(LispObject[] args) |
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501 | { |
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502 | if (args.length < 3 || args.length > 4) |
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503 | return error(new WrongNumberOfArgumentsException(this)); |
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504 | char dispChar = LispCharacter.getValue(args[0]); |
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505 | char subChar = LispCharacter.getValue(args[1]); |
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506 | LispObject function = coerceToFunction(args[2]); |
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507 | Readtable readtable; |
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508 | if (args.length == 4) |
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509 | readtable = designator_readtable(args[3]); |
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510 | else |
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511 | readtable = currentReadtable(); |
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512 | readtable.setDispatchMacroCharacter(dispChar, subChar, function); |
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513 | return T; |
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514 | } |
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515 | }; |
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516 | |
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517 | // ### set-syntax-from-char to-char from-char &optional to-readtable from-readtable |
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518 | // => t |
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519 | private static final Primitive SET_SYNTAX_FROM_CHAR = |
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520 | new Primitive("set-syntax-from-char", |
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521 | "to-char from-char &optional to-readtable from-readtable") |
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522 | { |
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523 | @Override |
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524 | public LispObject execute(LispObject[] args) |
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525 | { |
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526 | if (args.length < 2 || args.length > 4) |
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527 | return error(new WrongNumberOfArgumentsException(this)); |
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528 | char toChar = LispCharacter.getValue(args[0]); |
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529 | char fromChar = LispCharacter.getValue(args[1]); |
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530 | Readtable toReadtable; |
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531 | if (args.length > 2) |
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532 | toReadtable = checkReadtable(args[2]); |
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533 | else |
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534 | toReadtable = currentReadtable(); |
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535 | Readtable fromReadtable; |
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536 | if (args.length > 3) |
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537 | fromReadtable = designator_readtable(args[3]); |
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538 | else |
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539 | fromReadtable = checkReadtable(STANDARD_READTABLE.symbolValue()); |
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540 | // REVIEW synchronization |
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541 | toReadtable.syntax.put(toChar, fromReadtable.syntax.get(fromChar)); |
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542 | toReadtable.readerMacroFunctions.put(toChar, |
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543 | fromReadtable.readerMacroFunctions.get(fromChar)); |
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544 | // "If the character is a dispatching macro character, its entire |
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545 | // dispatch table of reader macro functions is copied." |
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546 | DispatchTable found = fromReadtable.dispatchTables.get(fromChar); |
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547 | if (found!=null) |
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548 | toReadtable.dispatchTables.put(toChar, new DispatchTable(found)); |
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549 | else |
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550 | // Don't leave behind dispatch tables when fromChar |
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551 | // doesn't have one |
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552 | toReadtable.dispatchTables.put(toChar, null); |
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553 | return T; |
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554 | } |
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555 | }; |
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556 | |
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557 | // ### readtable-case readtable => mode |
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558 | private static final Primitive READTABLE_CASE = |
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559 | new Primitive("readtable-case", "readtable") |
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560 | { |
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561 | @Override |
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562 | public LispObject execute(LispObject arg) |
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563 | { |
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564 | return checkReadtable(arg).readtableCase; |
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565 | } |
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566 | }; |
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567 | |
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568 | // ### %set-readtable-case readtable new-mode => new-mode |
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569 | private static final Primitive _SET_READTABLE_CASE = |
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570 | new Primitive("%set-readtable-case", PACKAGE_SYS, false, |
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571 | "readtable new-mode") |
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572 | { |
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573 | @Override |
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574 | public LispObject execute(LispObject first, LispObject second) |
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575 | |
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576 | { |
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577 | final Readtable readtable = checkReadtable(first); |
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578 | if (second == Keyword.UPCASE || second == Keyword.DOWNCASE || |
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579 | second == Keyword.INVERT || second == Keyword.PRESERVE) |
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580 | { |
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581 | readtable.readtableCase = second; |
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582 | return second; |
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583 | } |
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584 | return type_error(second, list(Symbol.MEMBER, |
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585 | Keyword.INVERT, |
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586 | Keyword.PRESERVE, |
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587 | Keyword.DOWNCASE, |
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588 | Keyword.UPCASE)); |
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589 | } |
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590 | }; |
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591 | } |
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