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annotate src/luan/modules/lucene/queryparser/SaneQueryParser.java @ 1110:38a42f437fd2

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queryparser now uses parsers.Parser
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 02 Aug 2017 13:45:06 -0600
parents 1a68fc55a80c
children 88b5b81cad4a
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1 package luan.modules.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 luan.modules.parsers.Parser;
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13 import luan.modules.parsers.ParseException;
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14
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15
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16 public class SaneQueryParser {
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17
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18 public static Query parseQuery(FieldParser fieldParser,String query) throws ParseException {
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19 return new SaneQueryParser(fieldParser,query).parseQuery();
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20 }
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21
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22 private static Pattern specialChar = Pattern.compile("[ \\t\\r\\n\":\\[\\]{}^+\\-(),?*\\\\]");
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23
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24 public static String literal(String s) {
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25 return specialChar.matcher(s).replaceAll("\\\\$0");
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26 }
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27
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28 public static Sort parseSort(FieldParser fieldParser,String sort) throws ParseException {
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29 return new SaneQueryParser(fieldParser,sort).parseSort();
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30 }
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31
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32
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33 private static final String NOT_IN_TERM = " \t\r\n\":[]{}^+-()";
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34 private static final String NOT_IN_FIELD = NOT_IN_TERM + ",";
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35 private final FieldParser fieldParser;
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36 private final Parser parser;
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37
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38 private SaneQueryParser(FieldParser fieldParser,String query) {
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39 this.fieldParser = fieldParser;
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40 this.parser = new Parser(query);
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41 parser.begin();
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42 }
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43
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44 ParseException exception(String msg) {
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45 parser.failure();
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46 return new ParseException(parser,msg);
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47 }
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48
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49 ParseException exception(Exception cause) {
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50 parser.failure();
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51 return new ParseException(parser,cause);
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52 }
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53
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54 private Query parseQuery() throws ParseException {
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55 Spaces();
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56 BooleanQuery bq = new BooleanQuery();
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57 while( !parser.endOfInput() ) {
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58 bq.add( Term(null) );
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59 }
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60 BooleanClause[] clauses = bq.getClauses();
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61 switch( clauses.length ) {
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62 case 0:
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63 return new MatchAllDocsQuery();
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64 case 1:
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65 {
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66 BooleanClause bc = clauses[0];
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67 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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68 return bc.getQuery();
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69 }
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70 default:
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71 return bq;
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72 }
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73 }
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74
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75 private BooleanClause Term(String defaultField) throws ParseException {
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76 BooleanClause.Occur occur;
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77 if( parser.match('+') ) {
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78 occur = BooleanClause.Occur.MUST;
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79 Spaces();
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80 } else if( parser.match('-') ) {
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81 occur = BooleanClause.Occur.MUST_NOT;
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82 Spaces();
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83 } else {
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84 occur = BooleanClause.Occur.SHOULD;
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85 }
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86 String field = QueryField();
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87 if( field == null )
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88 field = defaultField;
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89 Query query = NestedTerm(field);
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90 if( query == null )
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91 query = RangeTerm(field);
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92 if( query == null ) {
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93 parser.begin();
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94 String match = SimpleTerm();
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95 query = fieldParser.getQuery(this,field,match);
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96 parser.success();
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97 }
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98 if( parser.match('^') ) {
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99 Spaces();
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100 int start = parser.begin();
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101 try {
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102 while( parser.anyOf("0123456789.") );
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103 String match = parser.textFrom(start);
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104 float boost = Float.parseFloat(match);
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105 query.setBoost(boost);
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106 } catch(NumberFormatException e) {
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107 throw exception(e);
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108 }
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109 parser.success();
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110 Spaces();
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111 }
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112 BooleanClause bc = new BooleanClause(query,occur);
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113 return bc;
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114 }
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115
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116 private Query NestedTerm(String field) throws ParseException {
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117 parser.begin();
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118 if( !parser.match('(') )
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119 return parser.failure(null);
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120 BooleanQuery bq = new BooleanQuery();
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121 while( !parser.match(')') ) {
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122 if( parser.endOfInput() )
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123 throw exception("unclosed parentheses");
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124 bq.add( Term(field) );
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125 }
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126 Spaces();
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127 BooleanClause[] clauses = bq.getClauses();
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128 switch( clauses.length ) {
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129 case 0:
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130 throw exception("empty parentheses");
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131 case 1:
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132 {
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133 BooleanClause bc = clauses[0];
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134 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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135 return parser.success(bc.getQuery());
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136 }
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137 default:
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138 return parser.success(bq);
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139 }
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140 }
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141
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142 private Query RangeTerm(String field) throws ParseException {
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143 parser.begin();
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144 if( !parser.anyOf("[{") )
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145 return parser.failure(null);
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146 boolean includeMin = parser.lastChar() == '[';
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147 Spaces();
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148 String minQuery = SimpleTerm();
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149 TO();
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150 String maxQuery = SimpleTerm();
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151 if( !parser.anyOf("]}") )
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152 throw exception("unclosed range");
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153 boolean includeMax = parser.lastChar() == ']';
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154 Spaces();
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155 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax);
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156 return parser.success(query);
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157 }
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158
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159 private void TO() throws ParseException {
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160 parser.begin();
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161 if( !(parser.match("TO") && Space()) )
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162 throw exception("'TO' expected");
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163 Spaces();
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164 parser.success();
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165 }
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166
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167 private String SimpleTerm() throws ParseException {
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168 parser.begin();
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169 String match;
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170 if( parser.match('"') ) {
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171 int start = parser.currentIndex() - 1;
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172 while( !parser.match('"') ) {
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173 if( parser.endOfInput() )
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174 throw exception("unclosed quotes");
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175 parser.anyChar();
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176 checkEscape();
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177 }
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178 match = parser.textFrom(start);
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179 Spaces();
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180 } else {
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181 match = Unquoted(NOT_IN_TERM);
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182 }
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183 if( match.length() == 0 )
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184 throw exception("invalid input");
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185 return parser.success(match);
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186 }
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187
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188 private String QueryField() throws ParseException {
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189 parser.begin();
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190 String match = Field();
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191 if( match==null || !parser.match(':') )
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192 return parser.failure((String)null);
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193 Spaces();
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194 return parser.success(match);
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195 }
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196
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197 private String Field() throws ParseException {
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198 parser.begin();
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199 String match = Unquoted(NOT_IN_FIELD);
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200 if( match.length()==0 )
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201 return parser.failure((String)null);
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202 match = StringFieldParser.escape(this,match);
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203 return parser.success(match);
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204 }
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205
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206 private String Unquoted(String exclude) throws ParseException {
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207 int start = parser.begin();
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208 while( parser.noneOf(exclude) ) {
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209 checkEscape();
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210 }
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211 String match = parser.textFrom(start);
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212 Spaces();
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213 return parser.success(match);
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214 }
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215
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216 private void checkEscape() {
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217 if( parser.lastChar() == '\\' )
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218 parser.anyChar();
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219 }
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220
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221 private void Spaces() {
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222 while( Space() );
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223 }
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224
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225 private boolean Space() {
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226 return parser.anyOf(" \t\r\n");
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227 }
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228
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229
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230 // sort
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231
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232 private Sort parseSort() throws ParseException {
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233 Spaces();
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234 if( parser.endOfInput() )
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235 return null;
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236 List<SortField> list = new ArrayList<SortField>();
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237 list.add( SortField() );
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238 while( !parser.endOfInput() ) {
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239 parser.begin();
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240 if( !parser.match(',') )
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241 throw exception("',' expected");
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242 Spaces();
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243 parser.success();
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244 list.add( SortField() );
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245 }
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246 return new Sort(list.toArray(new SortField[0]));
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247 }
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248
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249 private SortField SortField() throws ParseException {
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250 parser.begin();
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251 String field = Field();
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252 if( field==null )
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253 throw exception("invalid input");
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254 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc");
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255 Spaces();
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256 SortField sf = fieldParser.getSortField(this,field,reverse);
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257 return parser.success(sf);
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258 }
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259
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260 }