Mercurial Hosting > luan
annotate src/goodjava/lucene/queryparser/GoodQueryParser.java @ 1732:8a6e48371c66
content type woff
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 12 Sep 2022 19:13:13 -0400 |
parents | b7f8418fb7ba |
children | d1e7564a9ce5 |
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1458 | 1 package goodjava.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 goodjava.parser.Parser; |
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13 import goodjava.parser.ParseException; |
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14 |
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15 |
1459 | 16 public class GoodQueryParser { |
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17 |
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18 public static Query parseQuery(FieldParser fieldParser,String query) throws ParseException { |
1459 | 19 return new GoodQueryParser(fieldParser,query).parseQuery(); |
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20 } |
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21 |
1622 | 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+'"'; | |
31 } | |
32 | |
1619 | 33 public static String escape(String s) { |
1458 | 34 s = s.replace("\\","\\\\"); |
35 s = s.replace("\b","\\b"); | |
36 s = s.replace("\f","\\f"); | |
37 s = s.replace("\n","\\n"); | |
38 s = s.replace("\r","\\r"); | |
39 s = s.replace("\t","\\t"); | |
40 s = s.replace("\"","\\\""); | |
1621 | 41 s = s.replace("-","\\-"); |
1619 | 42 return s; |
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43 } |
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44 |
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45 public static Sort parseSort(FieldParser fieldParser,String sort) throws ParseException { |
1459 | 46 return new GoodQueryParser(fieldParser,sort).parseSort(); |
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47 } |
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48 |
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49 |
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50 private static final String NOT_IN_RANGE = " \t\r\n\":[]{}^+()"; |
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51 private static final String NOT_IN_TERM = NOT_IN_RANGE + "-"; |
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52 private static final String NOT_IN_FIELD = NOT_IN_TERM + ","; |
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53 private final FieldParser fieldParser; |
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54 private final Parser parser; |
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55 |
1459 | 56 private GoodQueryParser(FieldParser fieldParser,String query) { |
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57 this.fieldParser = fieldParser; |
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58 this.parser = new Parser(query); |
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59 parser.begin(); |
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60 } |
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61 |
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62 ParseException exception(String msg) { |
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63 parser.failure(); |
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64 return new ParseException(parser,msg); |
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65 } |
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66 |
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67 ParseException exception(Exception cause) { |
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68 parser.failure(); |
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69 return new ParseException(parser,cause); |
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70 } |
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71 |
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72 private Query parseQuery() throws ParseException { |
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73 Spaces(); |
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74 BooleanQuery bq = new BooleanQuery(); |
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75 while( !parser.endOfInput() ) { |
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76 bq.add( Term(null) ); |
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77 } |
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78 BooleanClause[] clauses = bq.getClauses(); |
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79 switch( clauses.length ) { |
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80 case 0: |
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81 return new MatchAllDocsQuery(); |
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82 case 1: |
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83 { |
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84 BooleanClause bc = clauses[0]; |
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85 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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86 return bc.getQuery(); |
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87 } |
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88 default: |
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89 return bq; |
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90 } |
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91 } |
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92 |
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93 private BooleanClause Term(String defaultField) throws ParseException { |
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94 BooleanClause.Occur occur; |
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95 if( parser.match('+') ) { |
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96 occur = BooleanClause.Occur.MUST; |
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97 Spaces(); |
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98 } else if( parser.match('-') ) { |
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99 occur = BooleanClause.Occur.MUST_NOT; |
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100 Spaces(); |
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101 } else { |
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102 occur = BooleanClause.Occur.SHOULD; |
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103 } |
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104 String field = QueryField(); |
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105 if( field == null ) |
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106 field = defaultField; |
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107 Query query = NestedTerm(field); |
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108 if( query == null ) |
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109 query = RangeTerm(field); |
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110 if( query == null ) { |
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111 //parser.begin(); |
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112 String match = SimpleTerm(NOT_IN_TERM); |
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113 query = fieldParser.getQuery(this,field,match); |
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114 //parser.success(); |
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115 } |
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116 if( parser.match('^') ) { |
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117 Spaces(); |
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118 int start = parser.begin(); |
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119 try { |
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120 while( parser.anyOf("0123456789.") ); |
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121 String match = parser.textFrom(start); |
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122 float boost = Float.parseFloat(match); |
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123 query.setBoost(boost); |
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124 } catch(NumberFormatException e) { |
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125 throw exception(e); |
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126 } |
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127 parser.success(); |
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128 Spaces(); |
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129 } |
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130 BooleanClause bc = new BooleanClause(query,occur); |
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131 return bc; |
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132 } |
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133 |
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134 private Query NestedTerm(String field) throws ParseException { |
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135 parser.begin(); |
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136 if( !parser.match('(') ) |
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137 return parser.failure(null); |
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138 BooleanQuery bq = new BooleanQuery(); |
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139 while( !parser.match(')') ) { |
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140 if( parser.endOfInput() ) |
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141 throw exception("unclosed parentheses"); |
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142 bq.add( Term(field) ); |
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143 } |
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144 Spaces(); |
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145 BooleanClause[] clauses = bq.getClauses(); |
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146 switch( clauses.length ) { |
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147 case 0: |
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148 throw exception("empty parentheses"); |
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149 case 1: |
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150 { |
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151 BooleanClause bc = clauses[0]; |
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152 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT ) |
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153 return parser.success(bc.getQuery()); |
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154 } |
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155 default: |
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156 return parser.success(bq); |
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157 } |
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158 } |
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159 |
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160 private Query RangeTerm(String field) throws ParseException { |
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161 parser.begin(); |
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162 if( !parser.anyOf("[{") ) |
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163 return parser.failure(null); |
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164 boolean includeMin = parser.lastChar() == '['; |
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165 Spaces(); |
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166 String minQuery = SimpleTerm(NOT_IN_RANGE); |
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167 TO(); |
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168 String maxQuery = SimpleTerm(NOT_IN_RANGE); |
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169 if( !parser.anyOf("]}") ) |
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170 throw exception("unclosed range"); |
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171 boolean includeMax = parser.lastChar() == ']'; |
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172 Spaces(); |
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173 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax); |
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174 return parser.success(query); |
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175 } |
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176 |
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177 private void TO() throws ParseException { |
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178 parser.begin(); |
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179 if( !(parser.match("TO") && Space()) ) |
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180 throw exception("'TO' expected"); |
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181 Spaces(); |
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182 parser.success(); |
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183 } |
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184 |
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185 private String SimpleTerm(String exclude) throws ParseException { |
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186 parser.begin(); |
1422 | 187 String match = Quoted(); |
188 if( match==null ) | |
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189 match = Unquoted(exclude); |
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190 if( match.length() == 0 ) |
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191 throw exception("invalid input"); |
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192 return parser.success(match); |
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193 } |
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194 |
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195 private String QueryField() throws ParseException { |
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196 parser.begin(); |
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197 String match = Field(); |
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198 if( match==null || !parser.match(':') ) |
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199 return parser.failure((String)null); |
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200 Spaces(); |
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201 return parser.success(match); |
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202 } |
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203 |
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204 private String Field() throws ParseException { |
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205 parser.begin(); |
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206 String match = Unquoted(NOT_IN_FIELD); |
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207 if( match.length()==0 ) |
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208 return parser.failure((String)null); |
1619 | 209 match = StringFieldParser.unescape(this,match); |
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210 return parser.success(match); |
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211 } |
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212 |
1422 | 213 private String Quoted() throws ParseException { |
214 parser.begin(); | |
215 if( !parser.match('"') ) | |
216 return parser.failure(null); | |
217 StringBuilder sb = new StringBuilder(); | |
218 while( parser.anyChar() ) { | |
219 char c = parser.lastChar(); | |
220 switch(c) { | |
221 case '"': | |
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222 Spaces(); |
1422 | 223 return parser.success(sb.toString()); |
224 case '\\': | |
225 if( parser.anyChar() ) { | |
226 c = parser.lastChar(); | |
227 switch(c) { | |
228 case '"': | |
229 case '\\': | |
230 sb.append(c); | |
231 continue; | |
232 case 'b': | |
233 sb.append('\b'); | |
234 continue; | |
235 case 'f': | |
236 sb.append('\f'); | |
237 continue; | |
238 case 'n': | |
239 sb.append('\n'); | |
240 continue; | |
241 case 'r': | |
242 sb.append('\r'); | |
243 continue; | |
244 case 't': | |
245 sb.append('\t'); | |
246 continue; | |
247 case 'u': | |
248 int n = 0; | |
249 for( int i=0; i<4; i++ ) { | |
250 int d; | |
251 if( parser.inCharRange('0','9') ) { | |
252 d = parser.lastChar() - '0'; | |
253 } else if( parser.inCharRange('a','f') ) { | |
254 d = parser.lastChar() - 'a' + 10; | |
255 } else if( parser.inCharRange('A','F') ) { | |
256 d = parser.lastChar() - 'A' + 10; | |
257 } else { | |
258 throw exception("invalid hex digit"); | |
259 } | |
260 n = 16*n + d; | |
261 } | |
262 sb.append((char)n); | |
263 continue; | |
264 } | |
265 } | |
266 throw exception("invalid escape char"); | |
267 default: | |
268 sb.append(c); | |
269 } | |
270 } | |
271 parser.failure(); | |
272 throw exception("unclosed string"); | |
273 } | |
274 | |
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275 private String Unquoted(String exclude) throws ParseException { |
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276 int start = parser.begin(); |
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277 while( parser.noneOf(exclude) ) { |
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278 checkEscape(); |
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279 } |
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280 String match = parser.textFrom(start); |
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281 Spaces(); |
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282 return parser.success(match); |
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283 } |
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284 |
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285 private void checkEscape() { |
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286 if( parser.lastChar() == '\\' ) |
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287 parser.anyChar(); |
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288 } |
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289 |
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290 private void Spaces() { |
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291 while( Space() ); |
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292 } |
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293 |
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294 private boolean Space() { |
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295 return parser.anyOf(" \t\r\n"); |
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296 } |
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297 |
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298 |
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299 // sort |
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300 |
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301 private Sort parseSort() throws ParseException { |
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302 Spaces(); |
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303 if( parser.endOfInput() ) |
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304 return null; |
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305 List<SortField> list = new ArrayList<SortField>(); |
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306 list.add( SortField() ); |
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307 while( !parser.endOfInput() ) { |
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308 parser.begin(); |
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309 if( !parser.match(',') ) |
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310 throw exception("',' expected"); |
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311 Spaces(); |
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312 parser.success(); |
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313 list.add( SortField() ); |
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314 } |
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315 return new Sort(list.toArray(new SortField[0])); |
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316 } |
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317 |
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318 private SortField SortField() throws ParseException { |
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319 parser.begin(); |
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320 String field = Field(); |
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321 if( field==null ) |
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322 throw exception("invalid input"); |
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323 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc"); |
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324 Spaces(); |
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325 SortField sf = fieldParser.getSortField(this,field,reverse); |
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326 return parser.success(sf); |
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327 } |
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328 |
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329 } |