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annotate core/src/luan/modules/parsers/Html.java @ 625:a3c1e11fb6aa

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rewrite much of Html to be more understandable; add Lucene html_highlighter();
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 12 Jan 2016 23:52:56 -0700
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625
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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
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9
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10 public final class Html {
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11
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12 public static LuanTable toList(String text,LuanTable containerTagsTbl) throws ParseException {
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13 return new Html(text,containerTagsTbl).parse();
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14 }
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15
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16 private final Parser parser;
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17 private final Set<String> containerTags = new HashSet<String>();
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18
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19 private Html(String text,LuanTable containerTagsTbl) {
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20 this.parser = new Parser(text);
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21 for( Object v : containerTagsTbl.asList() ) {
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22 containerTags.add((String)v);
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23 }
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24 }
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25
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26 private LuanTable parse() throws ParseException {
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27 List list = new ArrayList();
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28 StringBuilder sb = new StringBuilder();
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29 while( !parser.endOfInput() ) {
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30 if( parser.test('<') ) {
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31 LuanTable tbl = parseTag();
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32 if( tbl != null ) {
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33 String tagName = (String)tbl.rawGet("name");
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34 if( containerTags.contains(tagName) ) {
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35 LuanTable container = parseContainer(tbl);
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36 if( container != null )
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37 tbl = container;
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38 }
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39 if( tbl != null
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40 || (tbl = parseComment()) != null
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41 || (tbl = parseCdata()) != null
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42 ) {
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43 if( sb.length() > 0 ) {
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44 list.add(sb.toString());
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45 sb.setLength(0);
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46 }
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47 list.add(tbl);
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48 continue;
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49 }
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50 }
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51 }
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52 sb.append( parser.currentChar() );
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53 parser.anyChar();
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54 }
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55 if( sb.length() > 0 )
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56 list.add(sb.toString());
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57 return new LuanTable(list);
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58 }
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59
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60 private LuanTable parseComment() {
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61 parser.begin();
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62 if( !parser.match("<!--") )
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63 return parser.failure(null);
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64 int start = parser.currentIndex();
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65 while( !parser.test("-->") ) {
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66 if( !parser.anyChar() )
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67 return parser.failure(null);
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68 }
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69 String text = parser.textFrom(start);
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70 LuanTable tbl = new LuanTable();
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71 tbl.rawPut("type","comment");
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72 tbl.rawPut("text",text);
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73 return parser.success(tbl);
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74 }
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75
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76 private LuanTable parseCdata() {
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77 parser.begin();
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78 if( !parser.match("<![CDATA[") )
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79 return parser.failure(null);
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80 int start = parser.currentIndex();
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81 while( !parser.test("]]>") ) {
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82 if( !parser.anyChar() )
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83 return parser.failure(null);
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84 }
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85 String text = parser.textFrom(start);
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86 LuanTable tbl = new LuanTable();
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87 tbl.rawPut("type","cdata");
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88 tbl.rawPut("text",text);
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89 return parser.success(tbl);
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90 }
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91
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92 private LuanTable parseContainer(LuanTable tag) {
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93 String endTagName = '/' + (String)tag.rawGet("name");
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94 int start = parser.begin();
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95 int end;
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96 while(true) {
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97 if( parser.test('<') ) {
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98 end = parser.currentIndex();
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99 LuanTable tag2 = parseTag();
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100 String s = (String)tag2.rawGet("name");
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101 if( s.equals(endTagName) )
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102 break;
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103 }
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104 if( !parser.anyChar() )
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105 return parser.failure(null);
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106 }
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107 String text = parser.text.substring(start,end);
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108 LuanTable tbl = new LuanTable();
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109 tbl.rawPut("type","container");
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110 tbl.rawPut("tag",tag);
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111 tbl.rawPut("text",text);
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112 return parser.success(tbl);
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113 }
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114
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115 private LuanTable parseTag() {
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116 parser.begin();
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117 if( !parser.match('<') )
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118 return parser.failure(null);
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119 int start = parser.currentIndex();
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120 parser.match('/');
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121 if( !matchNameChar() )
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122 return parser.failure(null);
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123 while( matchNameChar() );
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124 String name = parser.textFrom(start).toLowerCase();
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125 LuanTable attributes = new LuanTable();
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126 String attrName;
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127 while( (attrName = parseAttrName()) != null ) {
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128 String attrValue = parseAttrValue();
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129 attributes.rawPut( attrName, attrValue!=null ? attrValue : true );
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130 }
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131 while( matchSpace() );
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132 boolean isEmpty = parser.match('/');
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133 if( !parser.match('>') )
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134 return parser.failure(null);
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135 LuanTable tbl = new LuanTable();
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136 tbl.rawPut("type","tag");
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137 tbl.rawPut("name",name);
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138 tbl.rawPut("attributes",attributes);
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139 tbl.rawPut("is_empty",isEmpty);
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140 return parser.success(tbl);
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141 }
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142
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143 private String parseAttrName() {
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144 parser.begin();
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145 if( !matchSpace() )
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146 return parser.failure(null);
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147 while( matchSpace() );
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148 int start = parser.currentIndex();
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149 if( !matchNameChar() )
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150 return parser.failure(null);
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151 while( matchNameChar() );
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152 String name = parser.textFrom(start);
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153 return parser.success(name);
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154 }
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155
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156 private String parseAttrValue() {
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157 parser.begin();
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158 while( matchSpace() );
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159 if( !parser.match('=') )
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160 return parser.failure(null);
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161 while( matchSpace() );
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162 if( parser.anyOf("\"'") ) {
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163 char quote = parser.lastChar();
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164 int start = parser.currentIndex();
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165 while( !parser.test(quote) ) {
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166 if( !parser.anyChar() )
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167 return parser.failure(null);
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168 }
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169 String value = parser.textFrom(start);
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170 parser.match(quote);
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171 return parser.success(value);
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172 }
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173 int start = parser.currentIndex();
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174 if( !matchValueChar() )
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175 return parser.failure(null);
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176 while( matchValueChar() );
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177 String value = parser.textFrom(start);
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178 return parser.success(value);
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179 }
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180
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181 private boolean matchNameChar() {
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182 return parser.inCharRange('a','z')
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183 || parser.inCharRange('A','Z')
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184 || parser.inCharRange('0','9')
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185 || parser.anyOf("_.-:")
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186 ;
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187 }
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188
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189 private boolean matchValueChar() {
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190 return parser.noneOf(" \t\r\n\"'>/=");
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191 }
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192
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193 private boolean matchSpace() {
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194 return parser.anyOf(" \t\r\n");
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195 }
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196
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197 }