-// $Id: CQLParser.java,v 1.39 2007-08-06 15:54:48 mike Exp $
package org.z3950.zing.cql;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
+import java.io.Reader;
+import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
/**
* Compiles CQL strings into parse trees of CQLNode subtypes.
*
- * @version $Id: CQLParser.java,v 1.39 2007-08-06 15:54:48 mike Exp $
* @see <A href="http://zing.z3950.org/cql/index.html"
* >http://zing.z3950.org/cql/index.html</A>
*/
public class CQLParser {
private CQLLexer lexer;
+ private PositionAwareReader par; //active reader with position
private int compat; // When false, implement CQL 1.2
public static final int V1POINT1 = 12368;
public static final int V1POINT2 = 12369;
if (DEBUG)
System.err.println("PARSEDEBUG: " + str);
}
+
+ /**
+ * Compiles a CQL query.
+ * <P>
+ * The resulting parse tree may be further processed by hand (see
+ * the individual node-types' documentation for details on the
+ * data structure) or, more often, simply rendered out in the
+ * desired form using one of the back-ends. <TT>toCQL()</TT>
+ * returns a decompiled CQL query equivalent to the one that was
+ * compiled in the first place; <TT>toXCQL()</TT> returns an
+ * XML snippet representing the query; and <TT>toPQF()</TT>
+ * returns the query rendered in Index Data's Prefix Query
+ * Format.
+ *
+ * @param cql The query
+ * @return A CQLNode object which is the root of a parse
+ * tree representing the query. */
+ public CQLNode parse(String cql) throws CQLParseException, IOException {
+ return parse(new StringReader(cql));
+ }
/**
* Compiles a CQL query.
* @param cql The query
* @return A CQLNode object which is the root of a parse
* tree representing the query. */
- public CQLNode parse(String cql)
+ public CQLNode parse(Reader cql)
throws CQLParseException, IOException {
- lexer = new CQLLexer(cql, LEXDEBUG);
+ par = new PositionAwareReader(cql);
+ lexer = new CQLLexer(par, LEXDEBUG);
lexer.nextToken();
debug("about to parseQuery()");
CQLNode root = parseTopLevelPrefixes("cql.serverChoice",
new CQLRelation(compat == V1POINT2 ? "=" : "scr"));
if (lexer.ttype != CQLLexer.TT_EOF)
- throw new CQLParseException("junk after end: " + lexer.render());
+ throw new CQLParseException("junk after end: " + lexer.render(),
+ par.getPosition());
return root;
}
}
if (sortnode.keys.size() == 0) {
- throw new CQLParseException("no sort keys");
+ throw new CQLParseException("no sort keys", par.getPosition());
}
node = sortnode;
new CQLProxNode(term, term2, ms));
} else {
throw new CQLParseException("expected boolean, got " +
- lexer.render());
+ lexer.render(), par.getPosition());
}
}
match('/');
if (lexer.ttype != CQLLexer.TT_WORD)
throw new CQLParseException("expected modifier, "
- + "got " + lexer.render());
+ + "got " + lexer.render(),
+ par.getPosition());
String type = lexer.sval.toLowerCase();
match(lexer.ttype);
if (!isSymbolicRelation()) {
lexer.sval.equals("all") ||
lexer.sval.equals("within") ||
lexer.sval.equals("encloses") ||
- lexer.sval.equals("exact") ||
+ (lexer.sval.equals("exact") && compat != V1POINT2) ||
(lexer.sval.equals("scr") && compat != V1POINT2) ||
(lexer.sval.equals("adj") && compat == V1POINT2)))
return true;
if (lexer.ttype != token)
throw new CQLParseException("expected " +
lexer.render(token, true) +
- ", " + "got " + lexer.render());
+ ", " + "got " + lexer.render(),
+ par.getPosition());
int tmp = lexer.nextToken();
debug("match() got token=" + lexer.ttype + ", " +
"nval=" + lexer.nval + ", sval='" + lexer.sval + "'" +
}
throw new CQLParseException("expected " + expected + ", " +
- "got " + lexer.render());
+ "got " + lexer.render(), par.getPosition());
}
f.close();
System.out.println(root.toPQF(config));
} else {
- System.out.print(root.toXCQL(0));
+ System.out.print(root.toXCQL());
}
} catch (IOException ex) {
System.err.println("Can't render query: " + ex.getMessage());