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annotate src/luan/modules/parsers/Html.java @ 1289:8d54bcc0b6d3

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add css style parser
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 31 Dec 2018 20:59:08 -0700
parents 323743a7f317
children f41919741100
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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.LuanState;
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8 import luan.LuanTable;
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9 import luan.lib.parser.Parser;
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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(LuanState luan,String text,LuanTable containerTagsTbl) {
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15 return new Html(luan,text,containerTagsTbl).parse();
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16 }
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17
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18 private final LuanState luan;
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19 private final Parser parser;
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20 private final Set<String> containerTags = new HashSet<String>();
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21
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22 private Html(LuanState luan,String text,LuanTable containerTagsTbl) {
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23 this.luan = luan;
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24 this.parser = new Parser(text);
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25 for( Object v : containerTagsTbl.asList() ) {
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26 containerTags.add((String)v);
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27 }
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28 }
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29
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30 private LuanTable parse() {
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31 List list = new ArrayList();
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32 StringBuilder sb = new StringBuilder();
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33 while( !parser.endOfInput() ) {
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34 if( parser.test('<') ) {
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35 LuanTable tbl = parseTag();
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36 if( tbl != null ) {
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37 String tagName = (String)tbl.rawGet("name");
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38 if( containerTags.contains(tagName) ) {
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39 LuanTable container = parseContainer(tbl);
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40 if( container != null )
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41 tbl = container;
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42 }
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43 if( tbl != null
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44 || (tbl = parseComment()) != null
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45 || (tbl = parseCdata()) != null
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46 ) {
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47 if( sb.length() > 0 ) {
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48 list.add(sb.toString());
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49 sb.setLength(0);
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50 }
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51 list.add(tbl);
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52 continue;
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53 }
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54 }
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55 }
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56 sb.append( parser.currentChar() );
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57 parser.anyChar();
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58 }
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59 if( sb.length() > 0 )
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60 list.add(sb.toString());
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61 return new LuanTable(luan,list);
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62 }
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63
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64 private LuanTable parseComment() {
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65 parser.begin();
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66 if( !parser.match("<!--") )
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67 return parser.failure(null);
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68 int start = parser.currentIndex();
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69 while( !parser.test("-->") ) {
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70 if( !parser.anyChar() )
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71 return parser.failure(null);
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72 }
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73 String text = parser.textFrom(start);
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74 LuanTable tbl = new LuanTable(luan);
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75 tbl.rawPut("type","comment");
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76 tbl.rawPut("text",text);
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77 return parser.success(tbl);
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78 }
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79
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80 private LuanTable parseCdata() {
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81 parser.begin();
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82 if( !parser.match("<![CDATA[") )
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83 return parser.failure(null);
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84 int start = parser.currentIndex();
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85 while( !parser.test("]]>") ) {
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86 if( !parser.anyChar() )
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87 return parser.failure(null);
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88 }
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89 String text = parser.textFrom(start);
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90 LuanTable tbl = new LuanTable(luan);
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91 tbl.rawPut("type","cdata");
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92 tbl.rawPut("text",text);
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93 return parser.success(tbl);
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94 }
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95
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96 private LuanTable parseContainer(LuanTable tag) {
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97 String endTagName = '/' + (String)tag.rawGet("name");
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98 int start = parser.begin();
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99 int end;
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100 while(true) {
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101 if( parser.test('<') ) {
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102 end = parser.currentIndex();
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103 LuanTable tag2 = parseTag();
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104 String s = (String)tag2.rawGet("name");
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105 if( s.equals(endTagName) )
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106 break;
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107 }
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108 if( !parser.anyChar() )
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109 return parser.failure(null);
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110 }
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111 String text = parser.text.substring(start,end);
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112 LuanTable tbl = new LuanTable(luan);
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113 tbl.rawPut("type","container");
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114 tbl.rawPut("tag",tag);
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115 tbl.rawPut("text",text);
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116 return parser.success(tbl);
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117 }
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118
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119 private LuanTable parseTag() {
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120 LuanTable tbl = new LuanTable(luan);
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121 tbl.rawPut("type","tag");
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122 int tagStart = parser.begin();
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123 if( !parser.match('<') )
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124 return parser.failure(null);
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125 int start = parser.currentIndex();
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126 parser.match('/');
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127 if( !matchNameChar() )
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128 return parser.failure(null);
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129 while( matchNameChar() );
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130 String name = parser.textFrom(start).toLowerCase();
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131 tbl.rawPut("name",name);
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132 LuanTable attributes = new LuanTable(luan);
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133 tbl.rawPut("attributes",attributes);
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134 String attrName;
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135 while( (attrName = parseAttrName()) != null ) {
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136 String attrValue = parseAttrValue();
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137 attributes.rawPut( attrName, attrValue!=null ? attrValue : true );
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138 if( attrName.equals("style") && attrValue!=null ) {
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139 LuanTable style = Css.style(luan,attrValue);
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140 if( style!=null )
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141 tbl.rawPut("style",style);
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142 }
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143 }
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144 while( matchSpace() );
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145 boolean isEmpty = parser.match('/');
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146 tbl.rawPut("is_empty",isEmpty);
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147 if( !parser.match('>') )
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148 return parser.failure(null);
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149 String raw = parser.textFrom(tagStart);
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150 tbl.rawPut("raw",raw);
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151 return parser.success(tbl);
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152 }
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153
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154 private String parseAttrName() {
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155 parser.begin();
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156 if( !matchSpace() )
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157 return parser.failure(null);
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158 while( matchSpace() );
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159 int start = parser.currentIndex();
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160 if( !matchNameChar() )
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161 return parser.failure(null);
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162 while( matchNameChar() );
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163 String name = parser.textFrom(start).toLowerCase();
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164 return parser.success(name);
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165 }
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166
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167 private String parseAttrValue() {
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168 parser.begin();
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169 while( matchSpace() );
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170 if( !parser.match('=') )
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171 return parser.failure(null);
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172 while( matchSpace() );
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173 if( parser.anyOf("\"'") ) {
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174 char quote = parser.lastChar();
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175 int start = parser.currentIndex();
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176 while( !parser.test(quote) ) {
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177 if( !parser.anyChar() )
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178 return parser.failure(null);
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179 }
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180 String value = parser.textFrom(start);
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181 parser.match(quote);
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182 return parser.success(value);
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183 }
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184 int start = parser.currentIndex();
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185 if( !matchValueChar() )
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186 return parser.failure(null);
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187 while( matchValueChar() );
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188 String value = parser.textFrom(start);
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189 return parser.success(value);
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190 }
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191
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192 private boolean matchNameChar() {
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193 return parser.inCharRange('a','z')
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194 || parser.inCharRange('A','Z')
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195 || parser.inCharRange('0','9')
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196 || parser.anyOf("_.-:")
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197 ;
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198 }
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199
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200 private boolean matchValueChar() {
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201 return parser.noneOf(" \t\r\n\"'>/=");
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202 }
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203
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204 private boolean matchSpace() {
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205 return parser.anyOf(" \t\r\n");
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206 }
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207
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208 }