Mercurial Hosting > luan
annotate src/goodjava/queryparser/SaneQueryParser.java @ 1441:83e2585104b9
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 24 Jan 2020 12:59:20 -0500 |
parents | e48290f3d9fb |
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1 package goodjava.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 goodjava.parser.Parser; |
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13 import goodjava.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 |
1422 | 22 public static String quote(String s) { |
23 s = s.replace("\\","\\\\"); | |
24 s = s.replace("\b","\\b"); | |
25 s = s.replace("\f","\\f"); | |
26 s = s.replace("\n","\\n"); | |
27 s = s.replace("\r","\\r"); | |
28 s = s.replace("\t","\\t"); | |
29 s = s.replace("\"","\\\""); | |
30 return "\""+s+"\""; | |
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31 } |
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32 |
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33 public static Sort parseSort(FieldParser fieldParser,String sort) throws ParseException { |
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34 return new SaneQueryParser(fieldParser,sort).parseSort(); |
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35 } |
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36 |
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37 |
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38 private static final String NOT_IN_RANGE = " \t\r\n\":[]{}^+()"; |
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39 private static final String NOT_IN_TERM = NOT_IN_RANGE + "-"; |
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40 private static final String NOT_IN_FIELD = NOT_IN_TERM + ","; |
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41 private final FieldParser fieldParser; |
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42 private final Parser parser; |
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43 |
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44 private SaneQueryParser(FieldParser fieldParser,String query) { |
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45 this.fieldParser = fieldParser; |
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46 this.parser = new Parser(query); |
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47 parser.begin(); |
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48 } |
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49 |
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50 ParseException exception(String msg) { |
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51 parser.failure(); |
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52 return new ParseException(parser,msg); |
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53 } |
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54 |
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55 ParseException exception(Exception cause) { |
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56 parser.failure(); |
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57 return new ParseException(parser,cause); |
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58 } |
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59 |
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60 private Query parseQuery() throws ParseException { |
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61 Spaces(); |
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62 BooleanQuery bq = new BooleanQuery(); |
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63 while( !parser.endOfInput() ) { |
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64 bq.add( Term(null) ); |
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65 } |
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66 BooleanClause[] clauses = bq.getClauses(); |
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67 switch( clauses.length ) { |
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68 case 0: |
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69 return new MatchAllDocsQuery(); |
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70 case 1: |
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71 { |
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72 BooleanClause bc = clauses[0]; |
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73 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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74 return bc.getQuery(); |
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75 } |
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76 default: |
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77 return bq; |
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78 } |
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79 } |
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80 |
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81 private BooleanClause Term(String defaultField) throws ParseException { |
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82 BooleanClause.Occur occur; |
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83 if( parser.match('+') ) { |
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84 occur = BooleanClause.Occur.MUST; |
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85 Spaces(); |
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86 } else if( parser.match('-') ) { |
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87 occur = BooleanClause.Occur.MUST_NOT; |
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88 Spaces(); |
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89 } else { |
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90 occur = BooleanClause.Occur.SHOULD; |
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91 } |
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92 String field = QueryField(); |
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93 if( field == null ) |
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94 field = defaultField; |
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95 Query query = NestedTerm(field); |
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96 if( query == null ) |
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97 query = RangeTerm(field); |
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98 if( query == null ) { |
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99 parser.begin(); |
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100 String match = SimpleTerm(NOT_IN_TERM); |
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101 query = fieldParser.getQuery(this,field,match); |
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102 parser.success(); |
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103 } |
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104 if( parser.match('^') ) { |
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105 Spaces(); |
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106 int start = parser.begin(); |
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107 try { |
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108 while( parser.anyOf("0123456789.") ); |
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109 String match = parser.textFrom(start); |
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110 float boost = Float.parseFloat(match); |
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111 query.setBoost(boost); |
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112 } catch(NumberFormatException e) { |
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113 throw exception(e); |
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114 } |
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115 parser.success(); |
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116 Spaces(); |
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117 } |
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118 BooleanClause bc = new BooleanClause(query,occur); |
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119 return bc; |
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120 } |
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121 |
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122 private Query NestedTerm(String field) throws ParseException { |
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123 parser.begin(); |
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124 if( !parser.match('(') ) |
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125 return parser.failure(null); |
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126 BooleanQuery bq = new BooleanQuery(); |
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127 while( !parser.match(')') ) { |
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128 if( parser.endOfInput() ) |
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129 throw exception("unclosed parentheses"); |
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130 bq.add( Term(field) ); |
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131 } |
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132 Spaces(); |
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133 BooleanClause[] clauses = bq.getClauses(); |
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134 switch( clauses.length ) { |
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135 case 0: |
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136 throw exception("empty parentheses"); |
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137 case 1: |
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138 { |
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139 BooleanClause bc = clauses[0]; |
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140 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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141 return parser.success(bc.getQuery()); |
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142 } |
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143 default: |
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144 return parser.success(bq); |
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145 } |
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146 } |
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147 |
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148 private Query RangeTerm(String field) throws ParseException { |
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149 parser.begin(); |
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150 if( !parser.anyOf("[{") ) |
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151 return parser.failure(null); |
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152 boolean includeMin = parser.lastChar() == '['; |
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153 Spaces(); |
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154 String minQuery = SimpleTerm(NOT_IN_RANGE); |
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155 TO(); |
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156 String maxQuery = SimpleTerm(NOT_IN_RANGE); |
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157 if( !parser.anyOf("]}") ) |
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158 throw exception("unclosed range"); |
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159 boolean includeMax = parser.lastChar() == ']'; |
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160 Spaces(); |
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161 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax); |
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162 return parser.success(query); |
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163 } |
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164 |
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165 private void TO() throws ParseException { |
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166 parser.begin(); |
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167 if( !(parser.match("TO") && Space()) ) |
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168 throw exception("'TO' expected"); |
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169 Spaces(); |
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170 parser.success(); |
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171 } |
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172 |
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173 private String SimpleTerm(String exclude) throws ParseException { |
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174 parser.begin(); |
1422 | 175 String match = Quoted(); |
176 if( match==null ) | |
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177 match = Unquoted(exclude); |
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178 if( match.length() == 0 ) |
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179 throw exception("invalid input"); |
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180 return parser.success(match); |
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181 } |
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182 |
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183 private String QueryField() throws ParseException { |
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184 parser.begin(); |
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185 String match = Field(); |
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186 if( match==null || !parser.match(':') ) |
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187 return parser.failure((String)null); |
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188 Spaces(); |
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189 return parser.success(match); |
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190 } |
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191 |
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192 private String Field() throws ParseException { |
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193 parser.begin(); |
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194 String match = Unquoted(NOT_IN_FIELD); |
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195 if( match.length()==0 ) |
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196 return parser.failure((String)null); |
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197 match = StringFieldParser.escape(this,match); |
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198 return parser.success(match); |
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199 } |
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200 |
1422 | 201 private String Quoted() throws ParseException { |
202 parser.begin(); | |
203 if( !parser.match('"') ) | |
204 return parser.failure(null); | |
205 StringBuilder sb = new StringBuilder(); | |
206 while( parser.anyChar() ) { | |
207 char c = parser.lastChar(); | |
208 switch(c) { | |
209 case '"': | |
210 return parser.success(sb.toString()); | |
211 case '\\': | |
212 if( parser.anyChar() ) { | |
213 c = parser.lastChar(); | |
214 switch(c) { | |
215 case '"': | |
216 case '\\': | |
217 sb.append(c); | |
218 continue; | |
219 case 'b': | |
220 sb.append('\b'); | |
221 continue; | |
222 case 'f': | |
223 sb.append('\f'); | |
224 continue; | |
225 case 'n': | |
226 sb.append('\n'); | |
227 continue; | |
228 case 'r': | |
229 sb.append('\r'); | |
230 continue; | |
231 case 't': | |
232 sb.append('\t'); | |
233 continue; | |
234 case 'u': | |
235 int n = 0; | |
236 for( int i=0; i<4; i++ ) { | |
237 int d; | |
238 if( parser.inCharRange('0','9') ) { | |
239 d = parser.lastChar() - '0'; | |
240 } else if( parser.inCharRange('a','f') ) { | |
241 d = parser.lastChar() - 'a' + 10; | |
242 } else if( parser.inCharRange('A','F') ) { | |
243 d = parser.lastChar() - 'A' + 10; | |
244 } else { | |
245 throw exception("invalid hex digit"); | |
246 } | |
247 n = 16*n + d; | |
248 } | |
249 sb.append((char)n); | |
250 continue; | |
251 } | |
252 } | |
253 throw exception("invalid escape char"); | |
254 default: | |
255 sb.append(c); | |
256 } | |
257 } | |
258 parser.failure(); | |
259 throw exception("unclosed string"); | |
260 } | |
261 | |
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262 private String Unquoted(String exclude) throws ParseException { |
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263 int start = parser.begin(); |
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264 while( parser.noneOf(exclude) ) { |
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265 checkEscape(); |
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266 } |
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267 String match = parser.textFrom(start); |
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268 Spaces(); |
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269 return parser.success(match); |
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270 } |
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271 |
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272 private void checkEscape() { |
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273 if( parser.lastChar() == '\\' ) |
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274 parser.anyChar(); |
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275 } |
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276 |
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277 private void Spaces() { |
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278 while( Space() ); |
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279 } |
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280 |
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281 private boolean Space() { |
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282 return parser.anyOf(" \t\r\n"); |
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283 } |
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284 |
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285 |
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286 // sort |
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287 |
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288 private Sort parseSort() throws ParseException { |
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289 Spaces(); |
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290 if( parser.endOfInput() ) |
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291 return null; |
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292 List<SortField> list = new ArrayList<SortField>(); |
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293 list.add( SortField() ); |
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294 while( !parser.endOfInput() ) { |
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295 parser.begin(); |
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296 if( !parser.match(',') ) |
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297 throw exception("',' expected"); |
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298 Spaces(); |
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299 parser.success(); |
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300 list.add( SortField() ); |
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301 } |
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302 return new Sort(list.toArray(new SortField[0])); |
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303 } |
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304 |
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305 private SortField SortField() throws ParseException { |
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306 parser.begin(); |
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307 String field = Field(); |
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308 if( field==null ) |
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309 throw exception("invalid input"); |
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310 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc"); |
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311 Spaces(); |
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312 SortField sf = fieldParser.getSortField(this,field,reverse); |
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313 return parser.success(sf); |
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314 } |
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315 |
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316 } |