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annotate src/luan/modules/parsers/Html.java @ 1111:88b5b81cad4a

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move Parser to luan.lib.parser
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 02 Aug 2017 15:19:47 -0600
parents 1a68fc55a80c
children 9fa8b8389578
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1 package luan.modules.parsers;
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2
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Set;
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6 import java.util.HashSet;
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7 import luan.LuanTable;
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8 import luan.lib.parser.Parser;
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9 import luan.lib.parser.ParseException;
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10
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11
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12 public final class Html {
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13
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14 public static LuanTable toList(String text,LuanTable containerTagsTbl) throws ParseException {
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15 return new Html(text,containerTagsTbl).parse();
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16 }
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17
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18 private final Parser parser;
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19 private final Set<String> containerTags = new HashSet<String>();
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20
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21 private Html(String text,LuanTable containerTagsTbl) {
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22 this.parser = new Parser(text);
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23 for( Object v : containerTagsTbl.asList() ) {
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24 containerTags.add((String)v);
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25 }
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26 }
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27
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28 private LuanTable parse() throws ParseException {
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29 List list = new ArrayList();
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30 StringBuilder sb = new StringBuilder();
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31 while( !parser.endOfInput() ) {
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32 if( parser.test('<') ) {
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33 LuanTable tbl = parseTag();
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34 if( tbl != null ) {
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35 String tagName = (String)tbl.rawGet("name");
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36 if( containerTags.contains(tagName) ) {
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37 LuanTable container = parseContainer(tbl);
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38 if( container != null )
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39 tbl = container;
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40 }
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41 if( tbl != null
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42 || (tbl = parseComment()) != null
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43 || (tbl = parseCdata()) != null
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44 ) {
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45 if( sb.length() > 0 ) {
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46 list.add(sb.toString());
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47 sb.setLength(0);
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48 }
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49 list.add(tbl);
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50 continue;
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51 }
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52 }
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53 }
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54 sb.append( parser.currentChar() );
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55 parser.anyChar();
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56 }
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57 if( sb.length() > 0 )
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58 list.add(sb.toString());
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59 return new LuanTable(list);
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60 }
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61
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62 private LuanTable parseComment() {
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63 parser.begin();
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64 if( !parser.match("<!--") )
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65 return parser.failure(null);
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66 int start = parser.currentIndex();
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67 while( !parser.test("-->") ) {
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68 if( !parser.anyChar() )
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69 return parser.failure(null);
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70 }
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71 String text = parser.textFrom(start);
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72 LuanTable tbl = new LuanTable();
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73 tbl.rawPut("type","comment");
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74 tbl.rawPut("text",text);
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75 return parser.success(tbl);
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76 }
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77
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78 private LuanTable parseCdata() {
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79 parser.begin();
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80 if( !parser.match("<![CDATA[") )
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81 return parser.failure(null);
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82 int start = parser.currentIndex();
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83 while( !parser.test("]]>") ) {
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84 if( !parser.anyChar() )
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85 return parser.failure(null);
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86 }
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87 String text = parser.textFrom(start);
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88 LuanTable tbl = new LuanTable();
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89 tbl.rawPut("type","cdata");
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90 tbl.rawPut("text",text);
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91 return parser.success(tbl);
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92 }
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93
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94 private LuanTable parseContainer(LuanTable tag) {
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95 String endTagName = '/' + (String)tag.rawGet("name");
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96 int start = parser.begin();
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97 int end;
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98 while(true) {
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99 if( parser.test('<') ) {
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100 end = parser.currentIndex();
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101 LuanTable tag2 = parseTag();
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102 String s = (String)tag2.rawGet("name");
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103 if( s.equals(endTagName) )
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104 break;
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105 }
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106 if( !parser.anyChar() )
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107 return parser.failure(null);
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108 }
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109 String text = parser.text.substring(start,end);
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110 LuanTable tbl = new LuanTable();
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111 tbl.rawPut("type","container");
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112 tbl.rawPut("tag",tag);
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113 tbl.rawPut("text",text);
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114 return parser.success(tbl);
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115 }
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116
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117 private LuanTable parseTag() {
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118 parser.begin();
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119 if( !parser.match('<') )
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120 return parser.failure(null);
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121 int start = parser.currentIndex();
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122 parser.match('/');
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123 if( !matchNameChar() )
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124 return parser.failure(null);
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125 while( matchNameChar() );
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126 String name = parser.textFrom(start).toLowerCase();
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127 LuanTable attributes = new LuanTable();
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128 String attrName;
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129 while( (attrName = parseAttrName()) != null ) {
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130 String attrValue = parseAttrValue();
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131 attributes.rawPut( attrName, attrValue!=null ? attrValue : true );
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132 }
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133 while( matchSpace() );
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134 boolean isEmpty = parser.match('/');
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135 if( !parser.match('>') )
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136 return parser.failure(null);
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137 LuanTable tbl = new LuanTable();
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138 tbl.rawPut("type","tag");
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139 tbl.rawPut("name",name);
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140 tbl.rawPut("attributes",attributes);
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141 tbl.rawPut("is_empty",isEmpty);
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142 return parser.success(tbl);
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143 }
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144
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145 private String parseAttrName() {
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146 parser.begin();
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147 if( !matchSpace() )
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148 return parser.failure(null);
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149 while( matchSpace() );
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150 int start = parser.currentIndex();
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151 if( !matchNameChar() )
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152 return parser.failure(null);
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153 while( matchNameChar() );
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154 String name = parser.textFrom(start);
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155 return parser.success(name);
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156 }
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157
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158 private String parseAttrValue() {
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159 parser.begin();
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160 while( matchSpace() );
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161 if( !parser.match('=') )
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162 return parser.failure(null);
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163 while( matchSpace() );
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164 if( parser.anyOf("\"'") ) {
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165 char quote = parser.lastChar();
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166 int start = parser.currentIndex();
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167 while( !parser.test(quote) ) {
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168 if( !parser.anyChar() )
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169 return parser.failure(null);
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170 }
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171 String value = parser.textFrom(start);
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172 parser.match(quote);
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173 return parser.success(value);
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174 }
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175 int start = parser.currentIndex();
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176 if( !matchValueChar() )
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177 return parser.failure(null);
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178 while( matchValueChar() );
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179 String value = parser.textFrom(start);
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180 return parser.success(value);
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181 }
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182
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183 private boolean matchNameChar() {
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184 return parser.inCharRange('a','z')
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185 || parser.inCharRange('A','Z')
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186 || parser.inCharRange('0','9')
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187 || parser.anyOf("_.-:")
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188 ;
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189 }
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190
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191 private boolean matchValueChar() {
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192 return parser.noneOf(" \t\r\n\"'>/=");
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193 }
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194
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195 private boolean matchSpace() {
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196 return parser.anyOf(" \t\r\n");
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197 }
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198
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199 }