Mercurial Hosting > luan
annotate src/luan/modules/lucene/queryparser/SaneQueryParser.java @ 1333:25746915a241
merge Luan and LuanState
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Tue, 12 Feb 2019 22:33:40 -0700 |
parents | 88b5b81cad4a |
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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 import luan.lib.parser.Parser; |
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13 import luan.lib.parser.ParseException; |
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14 |
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15 |
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16 public class SaneQueryParser { |
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17 |
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18 public static Query parseQuery(FieldParser fieldParser,String query) throws ParseException { |
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19 return new SaneQueryParser(fieldParser,query).parseQuery(); |
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20 } |
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21 |
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22 private static Pattern specialChar = Pattern.compile("[ \\t\\r\\n\":\\[\\]{}^+\\-(),?*\\\\]"); |
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23 |
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24 public static String literal(String s) { |
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25 return specialChar.matcher(s).replaceAll("\\\\$0"); |
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26 } |
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27 |
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28 public static Sort parseSort(FieldParser fieldParser,String sort) throws ParseException { |
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29 return new SaneQueryParser(fieldParser,sort).parseSort(); |
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30 } |
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31 |
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32 |
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33 private static final String NOT_IN_TERM = " \t\r\n\":[]{}^+-()"; |
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34 private static final String NOT_IN_FIELD = NOT_IN_TERM + ","; |
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35 private final FieldParser fieldParser; |
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36 private final Parser parser; |
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37 |
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38 private SaneQueryParser(FieldParser fieldParser,String query) { |
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39 this.fieldParser = fieldParser; |
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40 this.parser = new Parser(query); |
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41 parser.begin(); |
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42 } |
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43 |
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44 ParseException exception(String msg) { |
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45 parser.failure(); |
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46 return new ParseException(parser,msg); |
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47 } |
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48 |
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49 ParseException exception(Exception cause) { |
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50 parser.failure(); |
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51 return new ParseException(parser,cause); |
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52 } |
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53 |
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54 private Query parseQuery() throws ParseException { |
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55 Spaces(); |
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56 BooleanQuery bq = new BooleanQuery(); |
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57 while( !parser.endOfInput() ) { |
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58 bq.add( Term(null) ); |
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59 } |
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60 BooleanClause[] clauses = bq.getClauses(); |
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61 switch( clauses.length ) { |
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62 case 0: |
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63 return new MatchAllDocsQuery(); |
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64 case 1: |
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65 { |
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66 BooleanClause bc = clauses[0]; |
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67 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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68 return bc.getQuery(); |
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69 } |
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70 default: |
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71 return bq; |
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72 } |
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73 } |
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74 |
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75 private BooleanClause Term(String defaultField) throws ParseException { |
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76 BooleanClause.Occur occur; |
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77 if( parser.match('+') ) { |
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78 occur = BooleanClause.Occur.MUST; |
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79 Spaces(); |
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80 } else if( parser.match('-') ) { |
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81 occur = BooleanClause.Occur.MUST_NOT; |
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82 Spaces(); |
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83 } else { |
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84 occur = BooleanClause.Occur.SHOULD; |
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85 } |
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86 String field = QueryField(); |
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87 if( field == null ) |
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88 field = defaultField; |
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89 Query query = NestedTerm(field); |
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90 if( query == null ) |
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91 query = RangeTerm(field); |
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92 if( query == null ) { |
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93 parser.begin(); |
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94 String match = SimpleTerm(); |
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95 query = fieldParser.getQuery(this,field,match); |
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96 parser.success(); |
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97 } |
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98 if( parser.match('^') ) { |
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99 Spaces(); |
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100 int start = parser.begin(); |
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101 try { |
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102 while( parser.anyOf("0123456789.") ); |
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103 String match = parser.textFrom(start); |
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104 float boost = Float.parseFloat(match); |
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105 query.setBoost(boost); |
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106 } catch(NumberFormatException e) { |
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107 throw exception(e); |
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108 } |
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109 parser.success(); |
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110 Spaces(); |
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111 } |
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112 BooleanClause bc = new BooleanClause(query,occur); |
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113 return bc; |
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114 } |
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115 |
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116 private Query NestedTerm(String field) throws ParseException { |
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117 parser.begin(); |
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118 if( !parser.match('(') ) |
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119 return parser.failure(null); |
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120 BooleanQuery bq = new BooleanQuery(); |
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121 while( !parser.match(')') ) { |
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122 if( parser.endOfInput() ) |
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123 throw exception("unclosed parentheses"); |
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124 bq.add( Term(field) ); |
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125 } |
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126 Spaces(); |
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127 BooleanClause[] clauses = bq.getClauses(); |
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128 switch( clauses.length ) { |
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129 case 0: |
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130 throw exception("empty parentheses"); |
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131 case 1: |
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132 { |
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133 BooleanClause bc = clauses[0]; |
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134 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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135 return parser.success(bc.getQuery()); |
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136 } |
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137 default: |
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138 return parser.success(bq); |
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139 } |
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140 } |
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141 |
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142 private Query RangeTerm(String field) throws ParseException { |
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143 parser.begin(); |
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144 if( !parser.anyOf("[{") ) |
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145 return parser.failure(null); |
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146 boolean includeMin = parser.lastChar() == '['; |
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147 Spaces(); |
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148 String minQuery = SimpleTerm(); |
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149 TO(); |
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150 String maxQuery = SimpleTerm(); |
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151 if( !parser.anyOf("]}") ) |
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152 throw exception("unclosed range"); |
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153 boolean includeMax = parser.lastChar() == ']'; |
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154 Spaces(); |
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155 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax); |
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156 return parser.success(query); |
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157 } |
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158 |
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159 private void TO() throws ParseException { |
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160 parser.begin(); |
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161 if( !(parser.match("TO") && Space()) ) |
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162 throw exception("'TO' expected"); |
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163 Spaces(); |
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164 parser.success(); |
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165 } |
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166 |
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167 private String SimpleTerm() throws ParseException { |
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168 parser.begin(); |
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169 String match; |
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170 if( parser.match('"') ) { |
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171 int start = parser.currentIndex() - 1; |
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172 while( !parser.match('"') ) { |
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173 if( parser.endOfInput() ) |
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174 throw exception("unclosed quotes"); |
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175 parser.anyChar(); |
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176 checkEscape(); |
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177 } |
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178 match = parser.textFrom(start); |
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179 Spaces(); |
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180 } else { |
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181 match = Unquoted(NOT_IN_TERM); |
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182 } |
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183 if( match.length() == 0 ) |
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184 throw exception("invalid input"); |
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185 return parser.success(match); |
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186 } |
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187 |
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188 private String QueryField() throws ParseException { |
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189 parser.begin(); |
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190 String match = Field(); |
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191 if( match==null || !parser.match(':') ) |
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192 return parser.failure((String)null); |
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193 Spaces(); |
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194 return parser.success(match); |
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195 } |
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196 |
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197 private String Field() throws ParseException { |
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198 parser.begin(); |
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199 String match = Unquoted(NOT_IN_FIELD); |
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200 if( match.length()==0 ) |
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201 return parser.failure((String)null); |
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202 match = StringFieldParser.escape(this,match); |
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203 return parser.success(match); |
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204 } |
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205 |
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206 private String Unquoted(String exclude) throws ParseException { |
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207 int start = parser.begin(); |
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208 while( parser.noneOf(exclude) ) { |
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209 checkEscape(); |
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210 } |
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211 String match = parser.textFrom(start); |
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212 Spaces(); |
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213 return parser.success(match); |
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214 } |
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215 |
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216 private void checkEscape() { |
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217 if( parser.lastChar() == '\\' ) |
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218 parser.anyChar(); |
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219 } |
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220 |
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221 private void Spaces() { |
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222 while( Space() ); |
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223 } |
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224 |
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225 private boolean Space() { |
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226 return parser.anyOf(" \t\r\n"); |
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227 } |
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228 |
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229 |
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230 // sort |
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231 |
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232 private Sort parseSort() throws ParseException { |
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233 Spaces(); |
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234 if( parser.endOfInput() ) |
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235 return null; |
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236 List<SortField> list = new ArrayList<SortField>(); |
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237 list.add( SortField() ); |
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238 while( !parser.endOfInput() ) { |
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239 parser.begin(); |
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240 if( !parser.match(',') ) |
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241 throw exception("',' expected"); |
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242 Spaces(); |
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243 parser.success(); |
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244 list.add( SortField() ); |
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245 } |
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246 return new Sort(list.toArray(new SortField[0])); |
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247 } |
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248 |
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249 private SortField SortField() throws ParseException { |
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250 parser.begin(); |
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251 String field = Field(); |
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252 if( field==null ) |
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253 throw exception("invalid input"); |
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254 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc"); |
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255 Spaces(); |
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256 SortField sf = fieldParser.getSortField(this,field,reverse); |
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257 return parser.success(sf); |
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258 } |
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259 |
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260 } |