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1 /*
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2 * Copyright 1999 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 import java.io.*;
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26 import java.util.*;
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27
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28 public class MacroDefinitions {
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29 private Vector macros;
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30
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31 public MacroDefinitions() {
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32 macros = new Vector();
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33 }
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34
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35 private String lookup(String name) throws NoSuchElementException {
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36 for (Iterator iter = macros.iterator(); iter.hasNext(); ) {
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37 Macro macro = (Macro) iter.next();
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38 if (macro.name.equals(name)) {
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39 return macro.contents;
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40 }
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41 }
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42 throw new NoSuchElementException(name);
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43 }
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44
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45 public void addMacro(String name, String contents) {
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46 Macro macro = new Macro();
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47 macro.name = name;
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48 macro.contents = contents;
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49 macros.add(macro);
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50 }
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51
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52 private boolean lineIsEmpty(String s) {
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53 for (int i = 0; i < s.length(); i++) {
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54 if (!Character.isWhitespace(s.charAt(i))) {
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55 return false;
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56 }
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57 }
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58 return true;
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59 }
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60
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61 public void readFrom(String fileName, boolean missingOk)
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62 throws FileNotFoundException, FileFormatException, IOException {
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63 BufferedReader reader = null;
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64 try {
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65 reader = new BufferedReader(new FileReader(fileName));
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66 } catch (FileNotFoundException e) {
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67 if (missingOk) {
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68 return;
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69 } else {
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70 throw(e);
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71 }
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72 }
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73 String line;
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74 do {
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75 line = reader.readLine();
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76 if (line != null) {
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77 // This had to be rewritten (compare to Database.java)
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78 // because the Solaris platform file has been
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79 // repurposed and now contains "macros" with spaces in
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80 // them.
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81
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82 if ((!line.startsWith("//")) &&
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83 (!lineIsEmpty(line))) {
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84 int nameBegin = -1;
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85 int nameEnd = -1;
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86 boolean gotEquals = false;
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87 int contentsBegin = -1;
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88 int contentsEnd = -1;
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89
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90 int i = 0;
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91 // Scan forward for beginning of name
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92 while (i < line.length()) {
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93 if (!Character.isWhitespace(line.charAt(i))) {
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94 break;
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95 }
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96 i++;
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97 }
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98 nameBegin = i;
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99
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100 // Scan forward for end of name
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101 while (i < line.length()) {
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102 if (Character.isWhitespace(line.charAt(i))) {
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103 break;
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104 }
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105 i++;
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106 }
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107 nameEnd = i;
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108
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109 // Scan forward for equals sign
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110 while (i < line.length()) {
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111 if (line.charAt(i) == '=') {
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112 gotEquals = true;
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113 break;
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114 }
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115 i++;
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116 }
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117
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118 // Scan forward for start of contents
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119 i++;
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120 while (i < line.length()) {
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121 if (!Character.isWhitespace(line.charAt(i))) {
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122 break;
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123 }
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124 i++;
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125 }
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126 contentsBegin = i;
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127
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128 // Scan *backward* for end of contents
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129 i = line.length() - 1;
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130 while (i >= 0) {
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131 if (!Character.isWhitespace(line.charAt(i))) {
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132 break;
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133 }
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134 }
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135 contentsEnd = i+1;
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136
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137 // Now do consistency check
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138 if (!((nameBegin < nameEnd) &&
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139 (nameEnd < contentsBegin) &&
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140 (contentsBegin < contentsEnd) &&
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141 (gotEquals == true))) {
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142 throw new FileFormatException(
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143 "Expected \"macroname = value\", " +
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144 "but found: " + line
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145 );
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146 }
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147
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148 String name = line.substring(nameBegin, nameEnd);
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149 String contents = line.substring(contentsBegin,
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150 contentsEnd);
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151 addMacro(name, contents);
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152 }
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153 }
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154 } while (line != null);
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155 reader.close();
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156 }
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157
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158 /** Throws IllegalArgumentException if passed token is illegally
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159 formatted */
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160 public String expand(String token)
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161 throws IllegalArgumentException {
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162 // the token may contain one or more <macroName>'s
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163
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164 String out = "";
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165
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166 // emacs lingo
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167 int mark = 0;
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168 int point = 0;
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169
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170 int len = token.length();
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171
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172 if (len == 0)
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173 return out;
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174
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175 do {
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176 // Scan "point" forward until hitting either the end of
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177 // the string or the beginning of a macro
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178 if (token.charAt(point) == '<') {
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179 // Append (point - mark) to out
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180 if ((point - mark) != 0) {
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181 out += token.substring(mark, point);
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182 }
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183 mark = point + 1;
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184 // Scan forward from point for right bracket
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185 point++;
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186 while ((point < len) &&
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187 (token.charAt(point) != '>')) {
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188 point++;
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189 }
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190 if (point == len) {
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191 throw new IllegalArgumentException(
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192 "Could not find right angle-bracket in token " + token
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193 );
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194 }
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195 String name = token.substring(mark, point);
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196 if (name == null) {
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197 throw new IllegalArgumentException(
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198 "Empty macro in token " + token
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199 );
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200 }
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201 try {
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202 String contents = lookup(name);
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203 out += contents;
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204 point++;
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205 mark = point;
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206 } catch (NoSuchElementException e) {
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207 throw new IllegalArgumentException(
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208 "Unknown macro " + name + " in token " + token
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209 );
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210 }
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211 } else {
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212 point++;
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213 }
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214 } while (point != len);
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215
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216 if (mark != point) {
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217 out += token.substring(mark, point);
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218 }
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219
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220 return out;
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221 }
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222
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223 public MacroDefinitions copy() {
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224 MacroDefinitions ret = new MacroDefinitions();
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225 for (Iterator iter = macros.iterator();
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226 iter.hasNext(); ) {
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227 Macro orig = (Macro) iter.next();
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228 Macro macro = new Macro();
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229 macro.name = orig.name;
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230 macro.contents = orig.contents;
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231 ret.macros.add(macro);
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232 }
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233 return ret;
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234 }
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235
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236 public void setAllMacroBodiesTo(String s) {
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237 for (Iterator iter = macros.iterator();
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238 iter.hasNext(); ) {
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239 Macro macro = (Macro) iter.next();
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240 macro.contents = s;
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241 }
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242 }
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243
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244 /** This returns an Iterator of Macros. You should not mutate the
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245 returned Macro objects or use the Iterator to remove
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246 macros. */
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247 public Iterator getMacros() {
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248 return macros.iterator();
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249 }
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250
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251 private void error(String text) throws FileFormatException {
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252 throw new FileFormatException(
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253 "Expected \"macroname = value\", but found: " + text
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254 );
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255 }
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256 }
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