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annotate src/luan/modules/lucene/queryparser/SaneQueryParser.java @ 775:1a68fc55a80c

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simplify dir structure
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 26 Aug 2016 14:36:40 -0600
parents lucene/src/luan/modules/lucene/queryparser/SaneQueryParser.java@01e68da6983b
children 38a42f437fd2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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13
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14 public class SaneQueryParser {
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15
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16 public static Query parseQuery(FieldParser fieldParser,String query) throws ParseException {
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17 return new SaneQueryParser(fieldParser,query).parseQuery();
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18 }
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19
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20 private static Pattern specialChar = Pattern.compile("[ \\t\\r\\n\":\\[\\]{}^+\\-(),?*\\\\]");
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21
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22 public static String literal(String s) {
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23 return specialChar.matcher(s).replaceAll("\\\\$0");
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24 }
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25
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26 public static Sort parseSort(FieldParser fieldParser,String sort) throws ParseException {
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27 return new SaneQueryParser(fieldParser,sort).parseSort();
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28 }
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29
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30
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31 private static final String NOT_IN_TERM = " \t\r\n\":[]{}^+-()";
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32 private static final String NOT_IN_FIELD = NOT_IN_TERM + ",";
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33 private final FieldParser fieldParser;
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34 final Parser parser;
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35
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36 private SaneQueryParser(FieldParser fieldParser,String query) {
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37 this.fieldParser = fieldParser;
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38 this.parser = new Parser(query);
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39 }
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40
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41 private Query parseQuery() throws ParseException {
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42 Spaces();
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43 BooleanQuery bq = new BooleanQuery();
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44 while( !parser.endOfInput() ) {
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45 bq.add( Term(null) );
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46 }
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47 BooleanClause[] clauses = bq.getClauses();
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48 switch( clauses.length ) {
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49 case 0:
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50 return new MatchAllDocsQuery();
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51 case 1:
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52 {
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53 BooleanClause bc = clauses[0];
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54 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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55 return bc.getQuery();
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56 }
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57 default:
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58 return bq;
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59 }
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60 }
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61
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62 private BooleanClause Term(String defaultField) throws ParseException {
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63 BooleanClause.Occur occur;
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64 if( parser.match('+') ) {
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65 occur = BooleanClause.Occur.MUST;
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66 Spaces();
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67 } else if( parser.match('-') ) {
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68 occur = BooleanClause.Occur.MUST_NOT;
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69 Spaces();
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70 } else {
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71 occur = BooleanClause.Occur.SHOULD;
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72 }
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73 String field = QueryField();
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74 if( field == null )
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75 field = defaultField;
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76 Query query = NestedTerm(field);
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77 if( query == null )
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78 query = RangeTerm(field);
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79 if( query == null ) {
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80 parser.begin();
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81 String match = SimpleTerm();
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82 query = fieldParser.getQuery(this,field,match);
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83 parser.success();
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84 }
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85 if( parser.match('^') ) {
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86 Spaces();
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87 int start = parser.begin();
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88 try {
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89 while( parser.anyOf("0123456789.") );
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90 String match = parser.textFrom(start);
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91 float boost = Float.parseFloat(match);
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92 query.setBoost(boost);
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93 } catch(NumberFormatException e) {
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94 throw new ParseException(this,e);
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95 }
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96 parser.success();
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97 Spaces();
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98 }
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99 BooleanClause bc = new BooleanClause(query,occur);
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100 return bc;
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101 }
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102
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103 private Query NestedTerm(String field) throws ParseException {
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104 parser.begin();
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105 if( !parser.match('(') )
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106 return parser.failure(null);
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107 BooleanQuery bq = new BooleanQuery();
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108 while( !parser.match(')') ) {
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109 if( parser.endOfInput() )
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110 throw new ParseException(this,"unclosed parentheses");
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111 bq.add( Term(field) );
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112 }
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113 Spaces();
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114 BooleanClause[] clauses = bq.getClauses();
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115 switch( clauses.length ) {
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116 case 0:
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117 throw new ParseException(this,"empty parentheses");
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118 case 1:
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119 {
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120 BooleanClause bc = clauses[0];
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121 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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122 return parser.success(bc.getQuery());
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123 }
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124 default:
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125 return parser.success(bq);
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126 }
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127 }
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128
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129 private Query RangeTerm(String field) throws ParseException {
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130 parser.begin();
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131 if( !parser.anyOf("[{") )
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132 return parser.failure(null);
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133 boolean includeMin = parser.lastChar() == '[';
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134 Spaces();
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135 String minQuery = SimpleTerm();
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136 TO();
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137 String maxQuery = SimpleTerm();
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138 if( !parser.anyOf("]}") )
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139 throw new ParseException(this,"unclosed range");
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140 boolean includeMax = parser.lastChar() == ']';
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141 Spaces();
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142 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax);
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143 return parser.success(query);
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144 }
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145
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146 private void TO() throws ParseException {
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147 parser.begin();
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148 if( !(parser.match("TO") && Space()) )
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149 throw new ParseException(this,"'TO' expected");
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150 Spaces();
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151 parser.success();
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152 }
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153
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154 private String SimpleTerm() throws ParseException {
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155 parser.begin();
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156 String match;
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157 if( parser.match('"') ) {
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158 int start = parser.currentIndex() - 1;
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159 while( !parser.match('"') ) {
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160 if( parser.endOfInput() )
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161 throw new ParseException(this,"unclosed quotes");
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162 parser.anyChar();
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163 checkEscape();
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164 }
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165 match = parser.textFrom(start);
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166 Spaces();
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167 } else {
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168 match = Unquoted(NOT_IN_TERM);
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169 }
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170 if( match.length() == 0 )
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171 throw new ParseException(this);
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172 return parser.success(match);
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173 }
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174
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175 private String QueryField() throws ParseException {
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176 parser.begin();
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177 String match = Field();
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178 if( match==null || !parser.match(':') )
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179 return parser.failure((String)null);
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180 Spaces();
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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 Field() throws ParseException {
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185 parser.begin();
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186 String match = Unquoted(NOT_IN_FIELD);
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187 if( match.length()==0 )
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188 return parser.failure((String)null);
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189 match = StringFieldParser.escape(this,match);
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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 Unquoted(String exclude) throws ParseException {
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194 int start = parser.begin();
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195 while( parser.noneOf(exclude) ) {
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196 checkEscape();
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197 }
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198 String match = parser.textFrom(start);
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199 Spaces();
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200 return parser.success(match);
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201 }
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202
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203 private void checkEscape() {
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204 if( parser.lastChar() == '\\' )
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205 parser.anyChar();
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206 }
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207
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208 private void Spaces() {
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209 while( Space() );
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210 }
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211
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212 private boolean Space() {
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213 return parser.anyOf(" \t\r\n");
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214 }
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215
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216
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217 // sort
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218
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219 private Sort parseSort() throws ParseException {
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220 Spaces();
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221 if( parser.endOfInput() )
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222 return null;
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223 List<SortField> list = new ArrayList<SortField>();
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224 list.add( SortField() );
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225 while( !parser.endOfInput() ) {
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226 parser.begin();
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227 if( !parser.match(',') )
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228 throw new ParseException(this,"',' expected");
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229 Spaces();
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230 parser.success();
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231 list.add( SortField() );
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232 }
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233 return new Sort(list.toArray(new SortField[0]));
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234 }
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235
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236 private SortField SortField() throws ParseException {
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237 parser.begin();
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238 String field = Field();
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239 if( field==null )
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240 throw new ParseException(this);
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241 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc");
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242 Spaces();
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243 SortField sf = fieldParser.getSortField(this,field,reverse);
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244 return parser.success(sf);
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245 }
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246
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247 }