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annotate lucene/src/luan/modules/lucene/queryparser/SaneQueryParser.java @ 730:01e68da6983b
add sane-lucene-queryparser source to luan
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 10 Jun 2016 15:41:15 -0600 |
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1 package luan.modules.lucene.queryparser; |
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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.regex.Pattern; |
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6 import org.apache.lucene.search.Query; |
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7 import org.apache.lucene.search.MatchAllDocsQuery; |
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8 import org.apache.lucene.search.BooleanClause; |
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9 import org.apache.lucene.search.BooleanQuery; |
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10 import org.apache.lucene.search.Sort; |
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11 import org.apache.lucene.search.SortField; |
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12 |
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13 |
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14 public class SaneQueryParser { |
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15 |
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16 public static Query parseQuery(FieldParser fieldParser,String query) throws ParseException { |
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17 return new SaneQueryParser(fieldParser,query).parseQuery(); |
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18 } |
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19 |
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20 private static Pattern specialChar = Pattern.compile("[ \\t\\r\\n\":\\[\\]{}^+\\-(),?*\\\\]"); |
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21 |
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22 public static String literal(String s) { |
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23 return specialChar.matcher(s).replaceAll("\\\\$0"); |
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24 } |
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25 |
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26 public static Sort parseSort(FieldParser fieldParser,String sort) throws ParseException { |
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27 return new SaneQueryParser(fieldParser,sort).parseSort(); |
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28 } |
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29 |
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30 |
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31 private static final String NOT_IN_TERM = " \t\r\n\":[]{}^+-()"; |
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32 private static final String NOT_IN_FIELD = NOT_IN_TERM + ","; |
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33 private final FieldParser fieldParser; |
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34 final Parser parser; |
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35 |
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36 private SaneQueryParser(FieldParser fieldParser,String query) { |
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37 this.fieldParser = fieldParser; |
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38 this.parser = new Parser(query); |
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39 } |
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40 |
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41 private Query parseQuery() throws ParseException { |
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42 Spaces(); |
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43 BooleanQuery bq = new BooleanQuery(); |
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44 while( !parser.endOfInput() ) { |
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45 bq.add( Term(null) ); |
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46 } |
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47 BooleanClause[] clauses = bq.getClauses(); |
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48 switch( clauses.length ) { |
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49 case 0: |
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50 return new MatchAllDocsQuery(); |
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51 case 1: |
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52 { |
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53 BooleanClause bc = clauses[0]; |
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54 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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55 return bc.getQuery(); |
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56 } |
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57 default: |
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58 return bq; |
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59 } |
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60 } |
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61 |
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62 private BooleanClause Term(String defaultField) throws ParseException { |
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63 BooleanClause.Occur occur; |
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64 if( parser.match('+') ) { |
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65 occur = BooleanClause.Occur.MUST; |
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66 Spaces(); |
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67 } else if( parser.match('-') ) { |
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68 occur = BooleanClause.Occur.MUST_NOT; |
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69 Spaces(); |
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70 } else { |
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71 occur = BooleanClause.Occur.SHOULD; |
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72 } |
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73 String field = QueryField(); |
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74 if( field == null ) |
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75 field = defaultField; |
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76 Query query = NestedTerm(field); |
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77 if( query == null ) |
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78 query = RangeTerm(field); |
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79 if( query == null ) { |
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80 parser.begin(); |
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81 String match = SimpleTerm(); |
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82 query = fieldParser.getQuery(this,field,match); |
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83 parser.success(); |
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84 } |
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85 if( parser.match('^') ) { |
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86 Spaces(); |
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87 int start = parser.begin(); |
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88 try { |
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89 while( parser.anyOf("0123456789.") ); |
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90 String match = parser.textFrom(start); |
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91 float boost = Float.parseFloat(match); |
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92 query.setBoost(boost); |
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93 } catch(NumberFormatException e) { |
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94 throw new ParseException(this,e); |
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95 } |
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96 parser.success(); |
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97 Spaces(); |
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98 } |
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99 BooleanClause bc = new BooleanClause(query,occur); |
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100 return bc; |
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101 } |
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102 |
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103 private Query NestedTerm(String field) throws ParseException { |
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104 parser.begin(); |
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105 if( !parser.match('(') ) |
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106 return parser.failure(null); |
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107 BooleanQuery bq = new BooleanQuery(); |
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108 while( !parser.match(')') ) { |
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109 if( parser.endOfInput() ) |
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110 throw new ParseException(this,"unclosed parentheses"); |
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111 bq.add( Term(field) ); |
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112 } |
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113 Spaces(); |
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114 BooleanClause[] clauses = bq.getClauses(); |
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115 switch( clauses.length ) { |
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116 case 0: |
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117 throw new ParseException(this,"empty parentheses"); |
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118 case 1: |
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119 { |
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120 BooleanClause bc = clauses[0]; |
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121 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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122 return parser.success(bc.getQuery()); |
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123 } |
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124 default: |
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125 return parser.success(bq); |
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126 } |
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127 } |
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128 |
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129 private Query RangeTerm(String field) throws ParseException { |
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130 parser.begin(); |
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131 if( !parser.anyOf("[{") ) |
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132 return parser.failure(null); |
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133 boolean includeMin = parser.lastChar() == '['; |
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134 Spaces(); |
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135 String minQuery = SimpleTerm(); |
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136 TO(); |
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137 String maxQuery = SimpleTerm(); |
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138 if( !parser.anyOf("]}") ) |
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139 throw new ParseException(this,"unclosed range"); |
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140 boolean includeMax = parser.lastChar() == ']'; |
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141 Spaces(); |
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142 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax); |
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143 return parser.success(query); |
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144 } |
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145 |
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146 private void TO() throws ParseException { |
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147 parser.begin(); |
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148 if( !(parser.match("TO") && Space()) ) |
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149 throw new ParseException(this,"'TO' expected"); |
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150 Spaces(); |
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151 parser.success(); |
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152 } |
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153 |
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154 private String SimpleTerm() throws ParseException { |
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155 parser.begin(); |
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156 String match; |
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157 if( parser.match('"') ) { |
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158 int start = parser.currentIndex() - 1; |
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159 while( !parser.match('"') ) { |
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160 if( parser.endOfInput() ) |
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161 throw new ParseException(this,"unclosed quotes"); |
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162 parser.anyChar(); |
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163 checkEscape(); |
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164 } |
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165 match = parser.textFrom(start); |
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166 Spaces(); |
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167 } else { |
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168 match = Unquoted(NOT_IN_TERM); |
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169 } |
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170 if( match.length() == 0 ) |
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171 throw new ParseException(this); |
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172 return parser.success(match); |
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173 } |
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174 |
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175 private String QueryField() throws ParseException { |
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176 parser.begin(); |
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177 String match = Field(); |
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178 if( match==null || !parser.match(':') ) |
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179 return parser.failure((String)null); |
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180 Spaces(); |
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181 return parser.success(match); |
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182 } |
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183 |
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184 private String Field() throws ParseException { |
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185 parser.begin(); |
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186 String match = Unquoted(NOT_IN_FIELD); |
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187 if( match.length()==0 ) |
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188 return parser.failure((String)null); |
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189 match = StringFieldParser.escape(this,match); |
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190 return parser.success(match); |
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191 } |
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192 |
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193 private String Unquoted(String exclude) throws ParseException { |
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194 int start = parser.begin(); |
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195 while( parser.noneOf(exclude) ) { |
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196 checkEscape(); |
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197 } |
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198 String match = parser.textFrom(start); |
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199 Spaces(); |
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200 return parser.success(match); |
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201 } |
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202 |
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203 private void checkEscape() { |
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204 if( parser.lastChar() == '\\' ) |
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205 parser.anyChar(); |
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206 } |
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207 |
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208 private void Spaces() { |
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209 while( Space() ); |
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210 } |
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211 |
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212 private boolean Space() { |
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213 return parser.anyOf(" \t\r\n"); |
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214 } |
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215 |
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216 |
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217 // sort |
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218 |
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219 private Sort parseSort() throws ParseException { |
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220 Spaces(); |
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221 if( parser.endOfInput() ) |
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222 return null; |
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223 List<SortField> list = new ArrayList<SortField>(); |
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224 list.add( SortField() ); |
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225 while( !parser.endOfInput() ) { |
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226 parser.begin(); |
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227 if( !parser.match(',') ) |
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228 throw new ParseException(this,"',' expected"); |
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229 Spaces(); |
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230 parser.success(); |
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231 list.add( SortField() ); |
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232 } |
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233 return new Sort(list.toArray(new SortField[0])); |
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234 } |
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235 |
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236 private SortField SortField() throws ParseException { |
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237 parser.begin(); |
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238 String field = Field(); |
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239 if( field==null ) |
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240 throw new ParseException(this); |
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241 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc"); |
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242 Spaces(); |
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243 SortField sf = fieldParser.getSortField(this,field,reverse); |
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244 return parser.success(sf); |
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245 } |
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246 |
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247 } |