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annotate src/goodjava/lucene/queryparser/GoodQueryParser.java @ 1621:a9591906e608

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minor
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 25 Jul 2021 23:14:59 -0600
parents 83caee2ed4ad
children b7f8418fb7ba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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83caee2ed4ad Lucene.escape
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22 public static String escape(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 s = s.replace("-","\\-");
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31 return s;
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32 }
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33
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34 public static Sort parseSort(FieldParser fieldParser,String sort) throws ParseException {
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35 return new GoodQueryParser(fieldParser,sort).parseSort();
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36 }
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37
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38
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39 private static final String NOT_IN_RANGE = " \t\r\n\":[]{}^+()";
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40 private static final String NOT_IN_TERM = NOT_IN_RANGE + "-";
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41 private static final String NOT_IN_FIELD = NOT_IN_TERM + ",";
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42 private final FieldParser fieldParser;
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43 private final Parser parser;
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44
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45 private GoodQueryParser(FieldParser fieldParser,String query) {
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46 this.fieldParser = fieldParser;
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47 this.parser = new Parser(query);
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48 parser.begin();
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49 }
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50
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51 ParseException exception(String msg) {
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52 parser.failure();
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53 return new ParseException(parser,msg);
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54 }
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55
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56 ParseException exception(Exception cause) {
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57 parser.failure();
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58 return new ParseException(parser,cause);
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59 }
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60
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61 private Query parseQuery() throws ParseException {
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62 Spaces();
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63 BooleanQuery bq = new BooleanQuery();
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64 while( !parser.endOfInput() ) {
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65 bq.add( Term(null) );
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66 }
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67 BooleanClause[] clauses = bq.getClauses();
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68 switch( clauses.length ) {
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69 case 0:
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70 return new MatchAllDocsQuery();
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71 case 1:
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72 {
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73 BooleanClause bc = clauses[0];
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74 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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75 return bc.getQuery();
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76 }
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77 default:
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78 return bq;
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79 }
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80 }
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81
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82 private BooleanClause Term(String defaultField) throws ParseException {
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83 BooleanClause.Occur occur;
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84 if( parser.match('+') ) {
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85 occur = BooleanClause.Occur.MUST;
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86 Spaces();
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87 } else if( parser.match('-') ) {
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88 occur = BooleanClause.Occur.MUST_NOT;
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89 Spaces();
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90 } else {
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91 occur = BooleanClause.Occur.SHOULD;
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92 }
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93 String field = QueryField();
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94 if( field == null )
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95 field = defaultField;
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96 Query query = NestedTerm(field);
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97 if( query == null )
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98 query = RangeTerm(field);
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99 if( query == null ) {
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100 //parser.begin();
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101 String match = SimpleTerm(NOT_IN_TERM);
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102 query = fieldParser.getQuery(this,field,match);
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103 //parser.success();
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104 }
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105 if( parser.match('^') ) {
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106 Spaces();
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107 int start = parser.begin();
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108 try {
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109 while( parser.anyOf("0123456789.") );
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110 String match = parser.textFrom(start);
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111 float boost = Float.parseFloat(match);
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112 query.setBoost(boost);
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113 } catch(NumberFormatException e) {
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114 throw exception(e);
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115 }
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116 parser.success();
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117 Spaces();
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118 }
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119 BooleanClause bc = new BooleanClause(query,occur);
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120 return bc;
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121 }
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122
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123 private Query NestedTerm(String field) throws ParseException {
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124 parser.begin();
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125 if( !parser.match('(') )
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126 return parser.failure(null);
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127 BooleanQuery bq = new BooleanQuery();
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128 while( !parser.match(')') ) {
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129 if( parser.endOfInput() )
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130 throw exception("unclosed parentheses");
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131 bq.add( Term(field) );
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132 }
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133 Spaces();
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134 BooleanClause[] clauses = bq.getClauses();
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135 switch( clauses.length ) {
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136 case 0:
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137 throw exception("empty parentheses");
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138 case 1:
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139 {
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140 BooleanClause bc = clauses[0];
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141 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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142 return parser.success(bc.getQuery());
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143 }
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144 default:
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145 return parser.success(bq);
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146 }
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147 }
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149 private Query RangeTerm(String field) throws ParseException {
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150 parser.begin();
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151 if( !parser.anyOf("[{") )
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152 return parser.failure(null);
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153 boolean includeMin = parser.lastChar() == '[';
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154 Spaces();
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155 String minQuery = SimpleTerm(NOT_IN_RANGE);
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156 TO();
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157 String maxQuery = SimpleTerm(NOT_IN_RANGE);
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158 if( !parser.anyOf("]}") )
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159 throw exception("unclosed range");
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160 boolean includeMax = parser.lastChar() == ']';
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161 Spaces();
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162 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax);
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163 return parser.success(query);
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164 }
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165
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166 private void TO() throws ParseException {
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167 parser.begin();
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168 if( !(parser.match("TO") && Space()) )
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169 throw exception("'TO' expected");
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170 Spaces();
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171 parser.success();
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172 }
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173
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174 private String SimpleTerm(String exclude) throws ParseException {
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175 parser.begin();
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176 String match = Quoted();
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177 if( match==null )
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178 match = Unquoted(exclude);
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179 if( match.length() == 0 )
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180 throw exception("invalid input");
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181 return parser.success(match);
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182 }
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183
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184 private String QueryField() throws ParseException {
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185 parser.begin();
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186 String match = Field();
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187 if( match==null || !parser.match(':') )
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188 return parser.failure((String)null);
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189 Spaces();
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190 return parser.success(match);
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191 }
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192
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193 private String Field() throws ParseException {
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194 parser.begin();
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195 String match = Unquoted(NOT_IN_FIELD);
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196 if( match.length()==0 )
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197 return parser.failure((String)null);
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198 match = StringFieldParser.unescape(this,match);
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199 return parser.success(match);
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200 }
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201
1422
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202 private String Quoted() throws ParseException {
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203 parser.begin();
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204 if( !parser.match('"') )
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205 return parser.failure(null);
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206 StringBuilder sb = new StringBuilder();
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207 while( parser.anyChar() ) {
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208 char c = parser.lastChar();
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209 switch(c) {
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210 case '"':
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211 Spaces();
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212 return parser.success(sb.toString());
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213 case '\\':
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214 if( parser.anyChar() ) {
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215 c = parser.lastChar();
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216 switch(c) {
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217 case '"':
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218 case '\\':
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219 sb.append(c);
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220 continue;
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221 case 'b':
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222 sb.append('\b');
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223 continue;
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224 case 'f':
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225 sb.append('\f');
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226 continue;
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227 case 'n':
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228 sb.append('\n');
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229 continue;
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230 case 'r':
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231 sb.append('\r');
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232 continue;
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233 case 't':
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234 sb.append('\t');
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235 continue;
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236 case 'u':
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237 int n = 0;
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238 for( int i=0; i<4; i++ ) {
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239 int d;
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240 if( parser.inCharRange('0','9') ) {
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241 d = parser.lastChar() - '0';
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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 if( parser.inCharRange('A','F') ) {
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245 d = parser.lastChar() - 'A' + 10;
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246 } else {
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247 throw exception("invalid hex digit");
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248 }
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249 n = 16*n + d;
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250 }
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251 sb.append((char)n);
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252 continue;
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253 }
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254 }
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255 throw exception("invalid escape char");
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256 default:
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257 sb.append(c);
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258 }
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259 }
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260 parser.failure();
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261 throw exception("unclosed string");
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262 }
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263
730
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264 private String Unquoted(String exclude) throws ParseException {
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265 int start = parser.begin();
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266 while( parser.noneOf(exclude) ) {
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267 checkEscape();
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268 }
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269 String match = parser.textFrom(start);
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270 Spaces();
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271 return parser.success(match);
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272 }
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273
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274 private void checkEscape() {
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275 if( parser.lastChar() == '\\' )
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276 parser.anyChar();
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277 }
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278
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279 private void Spaces() {
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280 while( Space() );
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281 }
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282
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283 private boolean Space() {
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284 return parser.anyOf(" \t\r\n");
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285 }
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286
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287
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288 // sort
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289
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290 private Sort parseSort() throws ParseException {
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291 Spaces();
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292 if( parser.endOfInput() )
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293 return null;
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294 List<SortField> list = new ArrayList<SortField>();
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295 list.add( SortField() );
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296 while( !parser.endOfInput() ) {
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297 parser.begin();
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298 if( !parser.match(',') )
1110
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299 throw exception("',' expected");
730
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300 Spaces();
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301 parser.success();
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302 list.add( SortField() );
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303 }
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304 return new Sort(list.toArray(new SortField[0]));
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305 }
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306
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307 private SortField SortField() throws ParseException {
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308 parser.begin();
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diff changeset
309 String field = Field();
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310 if( field==null )
1110
38a42f437fd2 queryparser now uses parsers.Parser
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311 throw exception("invalid input");
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312 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc");
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313 Spaces();
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314 SortField sf = fieldParser.getSortField(this,field,reverse);
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315 return parser.success(sf);
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316 }
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317
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318 }