1 | /* |
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2 | * LispReader.java |
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3 | * |
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4 | * Copyright (C) 2004-2007 Peter Graves |
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5 | * $Id: LispReader.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 | |
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36 | public final class LispReader extends Lisp |
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37 | { |
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38 | // ### read-comment |
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39 | public static final ReaderMacroFunction READ_COMMENT = |
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40 | new ReaderMacroFunction("read-comment", PACKAGE_SYS, false, |
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41 | "stream character") |
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42 | { |
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43 | @Override |
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44 | public LispObject execute(Stream stream, char ignored) |
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45 | |
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46 | { |
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47 | try |
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48 | { |
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49 | while (true) { |
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50 | int n = stream._readChar(); |
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51 | if (n < 0) |
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52 | return null; |
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53 | if (n == '\n') |
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54 | return null; |
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55 | } |
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56 | } |
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57 | catch (java.io.IOException e) |
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58 | { |
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59 | return null; |
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60 | } |
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61 | } |
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62 | }; |
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63 | |
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64 | // ### read-string |
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65 | public static final ReaderMacroFunction READ_STRING = |
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66 | new ReaderMacroFunction("read-string", PACKAGE_SYS, false, |
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67 | "stream character") |
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68 | { |
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69 | @Override |
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70 | public LispObject execute(Stream stream, char terminator) |
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71 | |
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72 | { |
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73 | final LispThread thread = LispThread.currentThread(); |
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74 | final Readtable rt = (Readtable) Symbol.CURRENT_READTABLE.symbolValue(thread); |
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75 | FastStringBuffer sb = new FastStringBuffer(); |
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76 | try |
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77 | { |
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78 | while (true) { |
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79 | int n = stream._readChar(); |
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80 | if (n < 0) { |
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81 | error(new EndOfFile(stream)); |
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82 | // Not reached. |
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83 | return null; |
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84 | } |
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85 | char c = (char) n; |
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86 | if (rt.getSyntaxType(c) == Readtable.SYNTAX_TYPE_SINGLE_ESCAPE) { |
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87 | // Single escape. |
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88 | n = stream._readChar(); |
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89 | if (n < 0) { |
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90 | error(new EndOfFile(stream)); |
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91 | // Not reached. |
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92 | return null; |
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93 | } |
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94 | sb.append((char)n); |
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95 | continue; |
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96 | } |
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97 | if (Utilities.isPlatformWindows) { |
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98 | if (c == '\r') { |
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99 | n = stream._readChar(); |
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100 | if (n < 0) { |
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101 | error(new EndOfFile(stream)); |
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102 | // Not reached. |
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103 | return null; |
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104 | } |
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105 | if (n == '\n') { |
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106 | sb.append('\n'); |
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107 | } else { |
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108 | // '\r' was not followed by '\n'. |
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109 | stream._unreadChar(n); |
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110 | sb.append('\r'); |
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111 | } |
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112 | continue; |
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113 | } |
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114 | } |
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115 | if (c == terminator) |
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116 | break; |
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117 | // Default. |
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118 | sb.append(c); |
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119 | } |
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120 | } |
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121 | catch (java.io.IOException e) |
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122 | { |
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123 | //error(new EndOfFile(stream)); |
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124 | return new SimpleString(sb); |
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125 | } |
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126 | return new SimpleString(sb); |
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127 | } |
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128 | }; |
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129 | |
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130 | // ### read-list |
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131 | public static final ReaderMacroFunction READ_LIST = |
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132 | new ReaderMacroFunction("read-list", PACKAGE_SYS, false, |
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133 | "stream character") |
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134 | { |
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135 | @Override |
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136 | public LispObject execute(Stream stream, char ignored) |
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137 | |
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138 | { |
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139 | return stream.readList(false, false); |
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140 | } |
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141 | }; |
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142 | |
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143 | // ### read-right-paren |
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144 | public static final ReaderMacroFunction READ_RIGHT_PAREN = |
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145 | new ReaderMacroFunction("read-right-paren", PACKAGE_SYS, false, |
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146 | "stream character") |
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147 | { |
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148 | @Override |
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149 | public LispObject execute(Stream stream, char ignored) |
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150 | |
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151 | { |
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152 | return error(new ReaderError("Unmatched right parenthesis.", stream)); |
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153 | } |
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154 | }; |
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155 | |
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156 | // ### read-quote |
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157 | public static final ReaderMacroFunction READ_QUOTE = |
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158 | new ReaderMacroFunction("read-quote", PACKAGE_SYS, false, |
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159 | "stream character") |
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160 | { |
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161 | @Override |
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162 | public LispObject execute(Stream stream, char ignored) |
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163 | |
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164 | { |
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165 | return new Cons(Symbol.QUOTE, |
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166 | new Cons(stream.read(true, NIL, true, |
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167 | LispThread.currentThread()))); |
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168 | } |
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169 | }; |
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170 | |
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171 | // ### read-dispatch-char |
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172 | public static final ReaderMacroFunction READ_DISPATCH_CHAR = |
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173 | new ReaderMacroFunction("read-dispatch-char", PACKAGE_SYS, false, |
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174 | "stream character") |
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175 | { |
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176 | @Override |
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177 | public LispObject execute(Stream stream, char c) |
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178 | |
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179 | { |
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180 | return stream.readDispatchChar(c, false); |
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181 | } |
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182 | }; |
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183 | |
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184 | // ### sharp-left-paren |
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185 | public static final DispatchMacroFunction SHARP_LEFT_PAREN = |
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186 | new DispatchMacroFunction("sharp-left-paren", PACKAGE_SYS, false, |
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187 | "stream sub-char numarg") |
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188 | { |
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189 | @Override |
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190 | public LispObject execute(Stream stream, char c, int n) |
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191 | |
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192 | { |
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193 | final LispThread thread = LispThread.currentThread(); |
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194 | LispObject list = stream.readList(true, false); |
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195 | if (_BACKQUOTE_COUNT_.symbolValue(thread).zerop()) { |
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196 | if (n >= 0) { |
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197 | LispObject[] array = new LispObject[n]; |
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198 | for (int i = 0; i < n; i++) { |
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199 | array[i] = list.car(); |
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200 | if (list.cdr() != NIL) |
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201 | list = list.cdr(); |
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202 | } |
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203 | return new SimpleVector(array); |
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204 | } else |
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205 | return new SimpleVector(list); |
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206 | } |
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207 | return new Cons(_BQ_VECTOR_FLAG_.symbolValue(thread), list); |
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208 | } |
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209 | }; |
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210 | |
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211 | // ### sharp-star |
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212 | public static final DispatchMacroFunction SHARP_STAR = |
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213 | new DispatchMacroFunction("sharp-star", PACKAGE_SYS, false, |
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214 | "stream sub-char numarg") |
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215 | { |
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216 | @Override |
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217 | public LispObject execute(Stream stream, char ignored, int n) |
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218 | |
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219 | { |
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220 | final LispThread thread = LispThread.currentThread(); |
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221 | final Readtable rt = (Readtable) Symbol.CURRENT_READTABLE.symbolValue(thread); |
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222 | final boolean suppress = Symbol.READ_SUPPRESS.symbolValue(thread) != NIL; |
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223 | FastStringBuffer sb = new FastStringBuffer(); |
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224 | try |
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225 | { |
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226 | while (true) { |
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227 | int ch = stream._readChar(); |
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228 | if (ch < 0) |
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229 | break; |
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230 | char c = (char) ch; |
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231 | if (c == '0' || c == '1') |
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232 | sb.append(c); |
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233 | else { |
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234 | int syntaxType = rt.getSyntaxType(c); |
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235 | if (syntaxType == Readtable.SYNTAX_TYPE_WHITESPACE || |
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236 | syntaxType == Readtable.SYNTAX_TYPE_TERMINATING_MACRO) { |
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237 | stream._unreadChar(c); |
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238 | break; |
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239 | } else if (!suppress) { |
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240 | String name = LispCharacter.charToName(c); |
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241 | if (name == null) |
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242 | name = "#\\" + c; |
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243 | error(new ReaderError("Illegal element for bit-vector: " + name, |
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244 | stream)); |
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245 | } |
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246 | } |
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247 | } |
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248 | } |
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249 | catch (java.io.IOException e) |
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250 | { |
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251 | error(new ReaderError("IO error-vector: ", |
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252 | stream)); |
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253 | } |
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254 | if (suppress) |
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255 | return NIL; |
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256 | if (n >= 0) { |
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257 | // n was supplied. |
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258 | final int length = sb.length(); |
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259 | if (length == 0) { |
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260 | if (n > 0) |
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261 | return error(new ReaderError("No element specified for bit vector of length " + |
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262 | n + '.', |
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263 | stream)); |
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264 | } |
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265 | if (n > length) { |
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266 | final char c = sb.charAt(length - 1); |
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267 | for (int i = length; i < n; i++) |
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268 | sb.append(c); |
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269 | } else if (n < length) { |
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270 | return error(new ReaderError("Bit vector is longer than specified length: #" + |
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271 | n + '*' + sb.toString(), |
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272 | stream)); |
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273 | } |
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274 | } |
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275 | return new SimpleBitVector(sb.toString()); |
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276 | } |
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277 | }; |
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278 | |
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279 | // ### sharp-dot |
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280 | public static final DispatchMacroFunction SHARP_DOT = |
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281 | new DispatchMacroFunction("sharp-dot", PACKAGE_SYS, false, |
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282 | "stream sub-char numarg") |
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283 | { |
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284 | @Override |
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285 | public LispObject execute(Stream stream, char c, int n) |
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286 | |
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287 | { |
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288 | final LispThread thread = LispThread.currentThread(); |
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289 | if (Symbol.READ_EVAL.symbolValue(thread) == NIL) |
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290 | return error(new ReaderError("Can't read #. when *READ-EVAL* is NIL.", |
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291 | stream)); |
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292 | else |
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293 | return eval(stream.read(true, NIL, true, thread), |
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294 | new Environment(), thread); |
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295 | } |
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296 | }; |
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297 | |
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298 | // ### sharp-colon |
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299 | public static final DispatchMacroFunction SHARP_COLON = |
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300 | new DispatchMacroFunction("sharp-colon", PACKAGE_SYS, false, |
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301 | "stream sub-char numarg") |
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302 | { |
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303 | @Override |
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304 | public LispObject execute(Stream stream, char c, int n) |
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305 | |
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306 | { |
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307 | return stream.readSymbol(); |
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308 | } |
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309 | }; |
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310 | |
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311 | // ### sharp-a |
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312 | public static final DispatchMacroFunction SHARP_A = |
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313 | new DispatchMacroFunction("sharp-a", PACKAGE_SYS, false, |
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314 | "stream sub-char numarg") |
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315 | { |
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316 | @Override |
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317 | public LispObject execute(Stream stream, char c, int n) |
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318 | |
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319 | { |
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320 | return stream.readArray(n); |
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321 | } |
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322 | }; |
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323 | |
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324 | // ### sharp-b |
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325 | public static final DispatchMacroFunction SHARP_B = |
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326 | new DispatchMacroFunction("sharp-b", PACKAGE_SYS, false, |
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327 | "stream sub-char numarg") |
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328 | { |
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329 | @Override |
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330 | public LispObject execute(Stream stream, char c, int n) |
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331 | |
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332 | { |
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333 | return stream.readRadix(2); |
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334 | } |
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335 | }; |
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336 | |
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337 | // ### sharp-c |
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338 | public static final DispatchMacroFunction SHARP_C = |
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339 | new DispatchMacroFunction("sharp-c", PACKAGE_SYS, false, |
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340 | "stream sub-char numarg") |
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341 | { |
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342 | @Override |
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343 | public LispObject execute(Stream stream, char c, int n) |
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344 | |
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345 | { |
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346 | return stream.readComplex(); |
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347 | } |
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348 | }; |
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349 | |
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350 | // ### sharp-o |
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351 | public static final DispatchMacroFunction SHARP_O = |
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352 | new DispatchMacroFunction("sharp-o", PACKAGE_SYS, false, |
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353 | "stream sub-char numarg") |
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354 | { |
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355 | @Override |
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356 | public LispObject execute(Stream stream, char c, int n) |
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357 | |
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358 | { |
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359 | return stream.readRadix(8); |
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360 | } |
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361 | }; |
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362 | |
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363 | // ### sharp-p |
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364 | public static final DispatchMacroFunction SHARP_P = |
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365 | new DispatchMacroFunction("sharp-p", PACKAGE_SYS, false, |
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366 | "stream sub-char numarg") |
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367 | { |
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368 | @Override |
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369 | public LispObject execute(Stream stream, char c, int n) |
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370 | |
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371 | { |
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372 | return stream.readPathname(); |
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373 | } |
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374 | }; |
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375 | |
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376 | // ### sharp-r |
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377 | public static final DispatchMacroFunction SHARP_R = |
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378 | new DispatchMacroFunction("sharp-r", PACKAGE_SYS, false, |
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379 | "stream sub-char numarg") |
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380 | { |
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381 | @Override |
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382 | public LispObject execute(Stream stream, char c, int n) |
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383 | |
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384 | { |
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385 | return stream.readRadix(n); |
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386 | } |
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387 | }; |
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388 | |
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389 | // ### sharp-s |
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390 | public static final DispatchMacroFunction SHARP_S = |
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391 | new DispatchMacroFunction("sharp-s", PACKAGE_SYS, false, |
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392 | "stream sub-char numarg") |
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393 | { |
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394 | @Override |
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395 | public LispObject execute(Stream stream, char c, int n) |
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396 | |
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397 | { |
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398 | return stream.readStructure(); |
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399 | } |
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400 | }; |
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401 | |
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402 | // ### sharp-x |
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403 | public static final DispatchMacroFunction SHARP_X = |
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404 | new DispatchMacroFunction("sharp-x", PACKAGE_SYS, false, |
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405 | "stream sub-char numarg") |
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406 | { |
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407 | @Override |
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408 | public LispObject execute(Stream stream, char c, int n) |
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409 | |
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410 | { |
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411 | return stream.readRadix(16); |
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412 | } |
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413 | }; |
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414 | |
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415 | // ### sharp-quote |
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416 | public static final DispatchMacroFunction SHARP_QUOTE = |
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417 | new DispatchMacroFunction("sharp-quote", PACKAGE_SYS, false, |
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418 | "stream sub-char numarg") |
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419 | { |
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420 | @Override |
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421 | public LispObject execute(Stream stream, char c, int n) |
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422 | |
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423 | { |
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424 | return new Cons(Symbol.FUNCTION, |
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425 | new Cons(stream.read(true, NIL, true, |
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426 | LispThread.currentThread()))); |
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427 | } |
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428 | }; |
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429 | |
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430 | // ### sharp-backslash |
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431 | public static final DispatchMacroFunction SHARP_BACKSLASH = |
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432 | new DispatchMacroFunction("sharp-backslash", PACKAGE_SYS, false, |
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433 | "stream sub-char numarg") |
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434 | { |
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435 | @Override |
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436 | public LispObject execute(Stream stream, char c, int n) |
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437 | |
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438 | { |
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439 | final LispThread thread = LispThread.currentThread(); |
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440 | final Readtable rt = (Readtable) Symbol.CURRENT_READTABLE.symbolValue(thread); |
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441 | return stream.readCharacterLiteral(rt, thread); |
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442 | } |
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443 | }; |
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444 | |
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445 | // ### sharp-vertical-bar |
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446 | public static final DispatchMacroFunction SHARP_VERTICAL_BAR = |
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447 | new DispatchMacroFunction("sharp-vertical-bar", PACKAGE_SYS, false, |
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448 | "stream sub-char numarg") |
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449 | { |
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450 | @Override |
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451 | public LispObject execute(Stream stream, char c, int n) |
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452 | |
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453 | { |
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454 | stream.skipBalancedComment(); |
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455 | return null; |
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456 | } |
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457 | }; |
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458 | |
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459 | // ### sharp-illegal |
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460 | public static final DispatchMacroFunction SHARP_ILLEGAL = |
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461 | new DispatchMacroFunction("sharp-illegal", PACKAGE_SYS, false, |
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462 | "stream sub-char numarg") |
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463 | { |
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464 | @Override |
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465 | public LispObject execute(Stream stream, char c, int n) |
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466 | |
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467 | { |
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468 | FastStringBuffer sb = new FastStringBuffer("Illegal # macro character: #\\"); |
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469 | String s = LispCharacter.charToName(c); |
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470 | if (s != null) |
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471 | sb.append(s); |
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472 | else |
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473 | sb.append(c); |
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474 | return error(new ReaderError(sb.toString(), stream)); |
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475 | } |
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476 | }; |
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477 | } |
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