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1 package org.json;
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2
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3 /*
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4 Copyright (c) 2002 JSON.org
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5
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6 Permission is hereby granted, free of charge, to any person obtaining a copy
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7 of this software and associated documentation files (the "Software"), to deal
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8 in the Software without restriction, including without limitation the rights
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9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 copies of the Software, and to permit persons to whom the Software is
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11 furnished to do so, subject to the following conditions:
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12
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13 The above copyright notice and this permission notice shall be included in all
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14 copies or substantial portions of the Software.
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15
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16 The Software shall be used for Good, not Evil.
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17
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18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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21 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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22 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 SOFTWARE.
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25 */
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26
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27 /**
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28 * The XMLTokener extends the JSONTokener to provide additional methods
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29 * for the parsing of XML texts.
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30 * @author JSON.org
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31 * @version 2008-09-18
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32 */
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33 public class XMLTokener extends JSONTokener {
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34
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35
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36 /** The table of entity values. It initially contains Character values for
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37 * amp, apos, gt, lt, quot.
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38 */
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39 public static final java.util.HashMap entity;
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40
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41 static {
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42 entity = new java.util.HashMap(8);
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43 entity.put("amp", XML.AMP);
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44 entity.put("apos", XML.APOS);
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45 entity.put("gt", XML.GT);
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46 entity.put("lt", XML.LT);
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47 entity.put("quot", XML.QUOT);
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48 }
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49
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50 /**
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51 * Construct an XMLTokener from a string.
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52 * @param s A source string.
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53 */
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54 public XMLTokener(String s) {
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55 super(s);
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56 }
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57
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58 /**
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59 * Get the text in the CDATA block.
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60 * @return The string up to the <code>]]></code>.
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61 * @throws JSONException If the <code>]]></code> is not found.
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62 */
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63 public String nextCDATA() throws JSONException {
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64 char c;
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65 int i;
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66 StringBuffer sb = new StringBuffer();
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67 for (;;) {
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68 c = next();
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69 if (c == 0) {
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70 throw syntaxError("Unclosed CDATA");
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71 }
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72 sb.append(c);
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73 i = sb.length() - 3;
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74 if (i >= 0 && sb.charAt(i) == ']' &&
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75 sb.charAt(i + 1) == ']' && sb.charAt(i + 2) == '>') {
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76 sb.setLength(i);
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77 return sb.toString();
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78 }
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79 }
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80 }
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81
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82
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83 /**
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84 * Get the next XML outer token, trimming whitespace. There are two kinds
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85 * of tokens: the '<' character which begins a markup tag, and the content
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86 * text between markup tags.
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87 *
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88 * @return A string, or a '<' Character, or null if there is no more
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89 * source text.
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90 * @throws JSONException
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91 */
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92 public Object nextContent() throws JSONException {
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93 char c;
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94 StringBuffer sb;
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95 do {
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96 c = next();
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97 } while (Character.isWhitespace(c));
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98 if (c == 0) {
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99 return null;
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100 }
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101 if (c == '<') {
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102 return XML.LT;
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103 }
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104 sb = new StringBuffer();
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105 for (;;) {
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106 if (c == '<' || c == 0) {
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107 back();
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108 return sb.toString().trim();
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109 }
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110 if (c == '&') {
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111 sb.append(nextEntity(c));
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112 } else {
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113 sb.append(c);
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114 }
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115 c = next();
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116 }
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117 }
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118
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119
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120 /**
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121 * Return the next entity. These entities are translated to Characters:
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122 * <code>& ' > < "</code>.
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123 * @param a An ampersand character.
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124 * @return A Character or an entity String if the entity is not recognized.
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125 * @throws JSONException If missing ';' in XML entity.
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126 */
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127 public Object nextEntity(char a) throws JSONException {
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128 StringBuffer sb = new StringBuffer();
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129 for (;;) {
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130 char c = next();
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131 if (Character.isLetterOrDigit(c) || c == '#') {
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132 sb.append(Character.toLowerCase(c));
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133 } else if (c == ';') {
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134 break;
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135 } else {
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136 throw syntaxError("Missing ';' in XML entity: &" + sb);
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137 }
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138 }
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139 String s = sb.toString();
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140 Object e = entity.get(s);
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141 return e != null ? e : a + s + ";";
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142 }
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143
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144
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145 /**
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146 * Returns the next XML meta token. This is used for skipping over <!...>
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147 * and <?...?> structures.
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148 * @return Syntax characters (<code>< > / = ! ?</code>) are returned as
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149 * Character, and strings and names are returned as Boolean. We don't care
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150 * what the values actually are.
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151 * @throws JSONException If a string is not properly closed or if the XML
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152 * is badly structured.
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153 */
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154 public Object nextMeta() throws JSONException {
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155 char c;
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156 char q;
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157 do {
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158 c = next();
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159 } while (Character.isWhitespace(c));
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160 switch (c) {
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161 case 0:
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162 throw syntaxError("Misshaped meta tag");
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163 case '<':
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164 return XML.LT;
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165 case '>':
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166 return XML.GT;
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167 case '/':
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168 return XML.SLASH;
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169 case '=':
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170 return XML.EQ;
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171 case '!':
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172 return XML.BANG;
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173 case '?':
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174 return XML.QUEST;
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175 case '"':
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176 case '\'':
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177 q = c;
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178 for (;;) {
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179 c = next();
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180 if (c == 0) {
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181 throw syntaxError("Unterminated string");
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182 }
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183 if (c == q) {
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184 return Boolean.TRUE;
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185 }
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186 }
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187 default:
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188 for (;;) {
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189 c = next();
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190 if (Character.isWhitespace(c)) {
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191 return Boolean.TRUE;
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192 }
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193 switch (c) {
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194 case 0:
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195 case '<':
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196 case '>':
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197 case '/':
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198 case '=':
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199 case '!':
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200 case '?':
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201 case '"':
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202 case '\'':
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203 back();
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204 return Boolean.TRUE;
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205 }
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206 }
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207 }
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208 }
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209
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210
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211 /**
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212 * Get the next XML Token. These tokens are found inside of angle
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213 * brackets. It may be one of these characters: <code>/ > = ! ?</code> or it
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214 * may be a string wrapped in single quotes or double quotes, or it may be a
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215 * name.
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216 * @return a String or a Character.
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217 * @throws JSONException If the XML is not well formed.
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218 */
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219 public Object nextToken() throws JSONException {
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220 char c;
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221 char q;
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222 StringBuffer sb;
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223 do {
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224 c = next();
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225 } while (Character.isWhitespace(c));
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226 switch (c) {
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227 case 0:
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228 throw syntaxError("Misshaped element");
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229 case '<':
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230 throw syntaxError("Misplaced '<'");
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231 case '>':
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232 return XML.GT;
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233 case '/':
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234 return XML.SLASH;
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235 case '=':
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236 return XML.EQ;
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237 case '!':
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238 return XML.BANG;
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239 case '?':
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240 return XML.QUEST;
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241
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242 // Quoted string
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243
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244 case '"':
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245 case '\'':
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246 q = c;
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247 sb = new StringBuffer();
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248 for (;;) {
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249 c = next();
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250 if (c == 0) {
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251 throw syntaxError("Unterminated string");
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252 }
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253 if (c == q) {
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254 return sb.toString();
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255 }
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256 if (c == '&') {
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257 sb.append(nextEntity(c));
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258 } else {
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259 sb.append(c);
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260 }
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261 }
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262 default:
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263
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264 // Name
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265
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266 sb = new StringBuffer();
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267 for (;;) {
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268 sb.append(c);
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269 c = next();
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270 if (Character.isWhitespace(c)) {
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271 return sb.toString();
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272 }
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273 switch (c) {
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274 case 0:
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275 return sb.toString();
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276 case '>':
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277 case '/':
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278 case '=':
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279 case '!':
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280 case '?':
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281 case '[':
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282 case ']':
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283 back();
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284 return sb.toString();
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285 case '<':
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286 case '"':
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287 case '\'':
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288 throw syntaxError("Bad character in a name");
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289 }
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290 }
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291 }
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292 }
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293
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294
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295 /**
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296 * Skip characters until past the requested string.
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297 * If it is not found, we are left at the end of the source with a result of false.
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298 * @param to A string to skip past.
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299 * @throws JSONException
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300 */
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301 public boolean skipPast(String to) throws JSONException {
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302 boolean b;
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303 char c;
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304 int i;
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305 int j;
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306 int offset = 0;
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307 int n = to.length();
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308 char[] circle = new char[n];
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309
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310 /*
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311 * First fill the circle buffer with as many characters as are in the
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312 * to string. If we reach an early end, bail.
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313 */
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314
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315 for (i = 0; i < n; i += 1) {
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316 c = next();
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317 if (c == 0) {
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318 return false;
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319 }
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320 circle[i] = c;
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321 }
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322 /*
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323 * We will loop, possibly for all of the remaining characters.
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324 */
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325 for (;;) {
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326 j = offset;
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327 b = true;
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328 /*
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329 * Compare the circle buffer with the to string.
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330 */
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331 for (i = 0; i < n; i += 1) {
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332 if (circle[j] != to.charAt(i)) {
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333 b = false;
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334 break;
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335 }
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336 j += 1;
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337 if (j >= n) {
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338 j -= n;
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339 }
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340 }
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341 /*
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342 * If we exit the loop with b intact, then victory is ours.
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343 */
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344 if (b) {
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345 return true;
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346 }
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347 /*
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348 * Get the next character. If there isn't one, then defeat is ours.
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349 */
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350 c = next();
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351 if (c == 0) {
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352 return false;
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353 }
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354 /*
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355 * Shove the character in the circle buffer and advance the
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356 * circle offset. The offset is mod n.
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357 */
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358 circle[offset] = c;
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359 offset += 1;
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360 if (offset >= n) {
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361 offset -= n;
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362 }
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363 }
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364 }
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365 }
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