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annotate src/luan/lib/queryparser/SaneQueryParser.java @ 1362:77f2d091f17f

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minor - SaneQueryParser
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 26 May 2019 12:42:08 -0600
parents dc2af9d5463b
children
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1 package luan.lib.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.lib.parser.Parser;
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13 import luan.lib.parser.ParseException;
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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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32
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33 private static final String NOT_IN_RANGE = " \t\r\n\":[]{}^+()";
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34 private static final String NOT_IN_TERM = NOT_IN_RANGE + "-";
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35 private static final String NOT_IN_FIELD = NOT_IN_TERM + ",";
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36 private final FieldParser fieldParser;
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37 private final Parser parser;
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38
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39 private SaneQueryParser(FieldParser fieldParser,String query) {
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40 this.fieldParser = fieldParser;
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41 this.parser = new Parser(query);
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42 parser.begin();
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43 }
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44
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45 ParseException exception(String msg) {
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46 parser.failure();
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47 return new ParseException(parser,msg);
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48 }
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49
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50 ParseException exception(Exception cause) {
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51 parser.failure();
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52 return new ParseException(parser,cause);
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53 }
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54
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55 private Query parseQuery() throws ParseException {
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56 Spaces();
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57 BooleanQuery bq = new BooleanQuery();
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58 while( !parser.endOfInput() ) {
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59 bq.add( Term(null) );
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60 }
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61 BooleanClause[] clauses = bq.getClauses();
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62 switch( clauses.length ) {
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63 case 0:
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64 return new MatchAllDocsQuery();
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65 case 1:
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66 {
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67 BooleanClause bc = clauses[0];
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68 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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69 return bc.getQuery();
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70 }
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71 default:
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72 return bq;
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73 }
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74 }
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75
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76 private BooleanClause Term(String defaultField) throws ParseException {
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77 BooleanClause.Occur occur;
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78 if( parser.match('+') ) {
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79 occur = BooleanClause.Occur.MUST;
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80 Spaces();
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81 } else if( parser.match('-') ) {
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82 occur = BooleanClause.Occur.MUST_NOT;
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83 Spaces();
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84 } else {
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85 occur = BooleanClause.Occur.SHOULD;
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86 }
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87 String field = QueryField();
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88 if( field == null )
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89 field = defaultField;
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90 Query query = NestedTerm(field);
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91 if( query == null )
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92 query = RangeTerm(field);
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93 if( query == null ) {
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94 parser.begin();
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95 String match = SimpleTerm(NOT_IN_TERM);
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96 query = fieldParser.getQuery(this,field,match);
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97 parser.success();
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98 }
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99 if( parser.match('^') ) {
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100 Spaces();
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101 int start = parser.begin();
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102 try {
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103 while( parser.anyOf("0123456789.") );
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104 String match = parser.textFrom(start);
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105 float boost = Float.parseFloat(match);
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106 query.setBoost(boost);
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107 } catch(NumberFormatException e) {
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108 throw exception(e);
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109 }
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110 parser.success();
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111 Spaces();
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112 }
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113 BooleanClause bc = new BooleanClause(query,occur);
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114 return bc;
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115 }
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116
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117 private Query NestedTerm(String field) throws ParseException {
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118 parser.begin();
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119 if( !parser.match('(') )
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120 return parser.failure(null);
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121 BooleanQuery bq = new BooleanQuery();
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122 while( !parser.match(')') ) {
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123 if( parser.endOfInput() )
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124 throw exception("unclosed parentheses");
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125 bq.add( Term(field) );
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126 }
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127 Spaces();
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128 BooleanClause[] clauses = bq.getClauses();
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129 switch( clauses.length ) {
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130 case 0:
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131 throw exception("empty parentheses");
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132 case 1:
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133 {
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134 BooleanClause bc = clauses[0];
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135 if( bc.getOccur() != BooleanClause.Occur.MUST_NOT )
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136 return parser.success(bc.getQuery());
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137 }
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138 default:
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139 return parser.success(bq);
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140 }
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141 }
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142
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143 private Query RangeTerm(String field) throws ParseException {
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144 parser.begin();
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145 if( !parser.anyOf("[{") )
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146 return parser.failure(null);
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147 boolean includeMin = parser.lastChar() == '[';
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148 Spaces();
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149 String minQuery = SimpleTerm(NOT_IN_RANGE);
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150 TO();
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151 String maxQuery = SimpleTerm(NOT_IN_RANGE);
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152 if( !parser.anyOf("]}") )
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153 throw exception("unclosed range");
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154 boolean includeMax = parser.lastChar() == ']';
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155 Spaces();
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156 Query query = fieldParser.getRangeQuery(this,field,minQuery,maxQuery,includeMin,includeMax);
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157 return parser.success(query);
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158 }
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159
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160 private void TO() throws ParseException {
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161 parser.begin();
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162 if( !(parser.match("TO") && Space()) )
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163 throw exception("'TO' expected");
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164 Spaces();
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165 parser.success();
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166 }
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167
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168 private String SimpleTerm(String exclude) throws ParseException {
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169 parser.begin();
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170 String match;
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171 if( parser.match('"') ) {
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172 int start = parser.currentIndex() - 1;
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173 while( !parser.match('"') ) {
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174 if( parser.endOfInput() )
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175 throw exception("unclosed quotes");
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176 parser.anyChar();
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177 checkEscape();
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178 }
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179 match = parser.textFrom(start);
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180 Spaces();
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181 } else {
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182 match = Unquoted(exclude);
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183 }
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184 if( match.length() == 0 )
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185 throw exception("invalid input");
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186 return parser.success(match);
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187 }
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188
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189 private String QueryField() throws ParseException {
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190 parser.begin();
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191 String match = Field();
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192 if( match==null || !parser.match(':') )
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193 return parser.failure((String)null);
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194 Spaces();
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195 return parser.success(match);
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196 }
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197
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198 private String Field() throws ParseException {
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199 parser.begin();
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200 String match = Unquoted(NOT_IN_FIELD);
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201 if( match.length()==0 )
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202 return parser.failure((String)null);
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203 match = StringFieldParser.escape(this,match);
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204 return parser.success(match);
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205 }
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206
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207 private String Unquoted(String exclude) throws ParseException {
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208 int start = parser.begin();
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209 while( parser.noneOf(exclude) ) {
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210 checkEscape();
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211 }
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212 String match = parser.textFrom(start);
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213 Spaces();
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214 return parser.success(match);
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215 }
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216
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217 private void checkEscape() {
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218 if( parser.lastChar() == '\\' )
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219 parser.anyChar();
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220 }
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221
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222 private void Spaces() {
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223 while( Space() );
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224 }
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225
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226 private boolean Space() {
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227 return parser.anyOf(" \t\r\n");
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228 }
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229
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230
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231 // sort
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232
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233 private Sort parseSort() throws ParseException {
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234 Spaces();
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235 if( parser.endOfInput() )
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236 return null;
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237 List<SortField> list = new ArrayList<SortField>();
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238 list.add( SortField() );
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239 while( !parser.endOfInput() ) {
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240 parser.begin();
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241 if( !parser.match(',') )
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242 throw exception("',' expected");
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243 Spaces();
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244 parser.success();
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245 list.add( SortField() );
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246 }
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247 return new Sort(list.toArray(new SortField[0]));
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248 }
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249
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250 private SortField SortField() throws ParseException {
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251 parser.begin();
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252 String field = Field();
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253 if( field==null )
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254 throw exception("invalid input");
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255 boolean reverse = !parser.matchIgnoreCase("asc") && parser.matchIgnoreCase("desc");
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256 Spaces();
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257 SortField sf = fieldParser.getSortField(this,field,reverse);
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258 return parser.success(sf);
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259 }
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260
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261 }