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annotate src/goodjava/lucene/queryparser/GoodQueryParser.java @ 1531:fa39e3c356ae

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 02 Aug 2020 16:44:38 -0600
parents b04b8fc5f4f4
children b1195cfe8712
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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 Sort parseSort(FieldParser fieldParser,String sort) throws ParseException {
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34 return new GoodQueryParser(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 GoodQueryParser(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();
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175 String match = Quoted();
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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
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201 private String Quoted() throws ParseException {
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202 parser.begin();
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203 if( !parser.match('"') )
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204 return parser.failure(null);
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205 StringBuilder sb = new StringBuilder();
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206 while( parser.anyChar() ) {
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207 char c = parser.lastChar();
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208 switch(c) {
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209 case '"':
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210 return parser.success(sb.toString());
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211 case '\\':
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212 if( parser.anyChar() ) {
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213 c = parser.lastChar();
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214 switch(c) {
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215 case '"':
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216 case '\\':
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217 sb.append(c);
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218 continue;
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219 case 'b':
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220 sb.append('\b');
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221 continue;
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222 case 'f':
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223 sb.append('\f');
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224 continue;
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225 case 'n':
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226 sb.append('\n');
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227 continue;
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228 case 'r':
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229 sb.append('\r');
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230 continue;
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231 case 't':
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232 sb.append('\t');
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233 continue;
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234 case 'u':
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235 int n = 0;
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236 for( int i=0; i<4; i++ ) {
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237 int d;
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238 if( parser.inCharRange('0','9') ) {
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239 d = parser.lastChar() - '0';
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240 } else if( parser.inCharRange('a','f') ) {
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241 d = parser.lastChar() - 'a' + 10;
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242 } else if( parser.inCharRange('A','F') ) {
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243 d = parser.lastChar() - 'A' + 10;
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244 } else {
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245 throw exception("invalid hex digit");
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246 }
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247 n = 16*n + d;
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248 }
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249 sb.append((char)n);
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250 continue;
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251 }
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252 }
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253 throw exception("invalid escape char");
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254 default:
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255 sb.append(c);
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256 }
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257 }
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258 parser.failure();
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259 throw exception("unclosed string");
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260 }
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261
730
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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(',') )
1110
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297 throw exception("',' expected");
730
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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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diff changeset
307 String field = Field();
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308 if( field==null )
1110
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309 throw exception("invalid input");
730
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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 }