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annotate src/goodjava/lucene/queryparser/GoodQueryParser.java @ 1677:ea7075b7afe1

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author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 31 May 2022 14:36:16 -0600
parents b7f8418fb7ba
children d1e7564a9ce5
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6b6c11c9164e goodjava.lucene
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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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15
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16 public class GoodQueryParser {
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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 GoodQueryParser(fieldParser,query).parseQuery();
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20 }
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21
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22 public static String quote(String s) {
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23 s = s.replace("\\","\\\\");
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24 s = s.replace("\b","\\b");
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25 s = s.replace("\f","\\f");
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26 s = s.replace("\n","\\n");
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27 s = s.replace("\r","\\r");
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28 s = s.replace("\t","\\t");
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29 s = s.replace("\"","\\\"");
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30 return '"'+s+'"';
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31 }
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32
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33 public static String escape(String s) {
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34 s = s.replace("\\","\\\\");
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35 s = s.replace("\b","\\b");
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36 s = s.replace("\f","\\f");
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37 s = s.replace("\n","\\n");
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38 s = s.replace("\r","\\r");
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39 s = s.replace("\t","\\t");
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40 s = s.replace("\"","\\\"");
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41 s = s.replace("-","\\-");
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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 {
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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
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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();
1362
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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();
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187 String match = Quoted();
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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
83caee2ed4ad Lucene.escape
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209 match = StringFieldParser.unescape(this,match);
730
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210 return parser.success(match);
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211 }
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212
1422
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213 private String Quoted() throws ParseException {
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214 parser.begin();
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215 if( !parser.match('"') )
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216 return parser.failure(null);
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217 StringBuilder sb = new StringBuilder();
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218 while( parser.anyChar() ) {
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219 char c = parser.lastChar();
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220 switch(c) {
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221 case '"':
1564
b1195cfe8712 lucene/queryparser fix
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222 Spaces();
1422
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223 return parser.success(sb.toString());
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224 case '\\':
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225 if( parser.anyChar() ) {
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226 c = parser.lastChar();
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227 switch(c) {
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228 case '"':
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229 case '\\':
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230 sb.append(c);
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231 continue;
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232 case 'b':
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233 sb.append('\b');
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234 continue;
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235 case 'f':
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236 sb.append('\f');
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237 continue;
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238 case 'n':
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239 sb.append('\n');
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240 continue;
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241 case 'r':
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242 sb.append('\r');
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243 continue;
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244 case 't':
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245 sb.append('\t');
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246 continue;
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247 case 'u':
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248 int n = 0;
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diff changeset
249 for( int i=0; i<4; i++ ) {
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250 int d;
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251 if( parser.inCharRange('0','9') ) {
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252 d = parser.lastChar() - '0';
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diff changeset
253 } else if( parser.inCharRange('a','f') ) {
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254 d = parser.lastChar() - 'a' + 10;
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255 } else if( parser.inCharRange('A','F') ) {
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256 d = parser.lastChar() - 'A' + 10;
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257 } else {
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258 throw exception("invalid hex digit");
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diff changeset
259 }
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260 n = 16*n + d;
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261 }
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262 sb.append((char)n);
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263 continue;
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264 }
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265 }
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266 throw exception("invalid escape char");
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267 default:
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268 sb.append(c);
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269 }
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270 }
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271 parser.failure();
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272 throw exception("unclosed string");
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273 }
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274
730
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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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diff changeset
303 if( parser.endOfInput() )
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304 return null;
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diff changeset
305 List<SortField> list = new ArrayList<SortField>();
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diff changeset
306 list.add( SortField() );
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diff changeset
307 while( !parser.endOfInput() ) {
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308 parser.begin();
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diff changeset
309 if( !parser.match(',') )
1110
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diff changeset
310 throw exception("',' expected");
730
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diff changeset
311 Spaces();
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diff changeset
312 parser.success();
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diff changeset
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 }