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|
grammar ConjunctiveQuery;
options {
language = Java;
output = AST;
}
tokens {
VARIABLE;
CONSTANT;
SCONSTANT;
ATOM;
HEADATOM;
PREDICATE;
ATOM_LIST;
TERM_LIST;
RULE;
EXPRESSION;
PREFIX_LIST;
ID;
PREFIX;
PREDICATE;
}
@header {
package org.semanticweb.karma2.model.cqparser;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Set;
import org.semanticweb.karma2.model.ConjunctiveQuery;
import org.semanticweb.karma2.model.cqparser.ConjunctiveQueryWalker;
import org.semanticweb.karma2.exception.IllegalInputQueryException;
}
@members{
public ConjunctiveQueryParser(String string)
throws FileNotFoundException, IOException {
this(new CommonTokenStream(new ConjunctiveQueryLexer(new ANTLRStringStream(string))));
}
public ConjunctiveQueryParser(InputStream istream) throws FileNotFoundException, IOException {
this(new CommonTokenStream(new ConjunctiveQueryLexer(new ANTLRInputStream(istream))));
}
public ConjunctiveQueryParser(File file) throws FileNotFoundException, IOException {
this(new CommonTokenStream(new ConjunctiveQueryLexer(new ANTLRInputStream(new FileInputStream(file)))));
}
public ConjunctiveQuery parse() throws IllegalInputQueryException {
cq_return r = null;
try {
r = cq();
} catch (RecognitionException e) {
e.printStackTrace();
}
CommonTree t = (CommonTree) r.getTree();
//System.out.println(t.toStringTree());
CommonTreeNodeStream nodes = new CommonTreeNodeStream(t);
// AST nodes have payloads that point into token stream
nodes.setTokenStream(input);
ConjunctiveQueryWalker walker = new ConjunctiveQueryWalker();
ConjunctiveQuery cq = walker.walkExpressionNode(t);
return cq;
}
public ConjunctiveQuery parseCQ() throws IllegalInputQueryException {
return parse();
}
}
@lexer::header{
package org.semanticweb.karma2.model.cqparser;
}
cq :
prefixlist rulebody -> ^(EXPRESSION prefixlist rulebody );
prefixlist:
prefix (',' prefix)* -> ^(PREFIX_LIST prefix*);
prefix:
'prefix' id ':' '<' url '>' -> ^(PREFIX id url);
rulebody:
headatom ('<-'|':') body '.'? -> ^(RULE headatom body);
body:
atom (',' atom)* -> ^(ATOM_LIST atom*);
headatom:
id '(' term (',' term)* ')' -> ^(HEADATOM term*);
atom:
compositeid '(' term (',' term)* ')' -> ^(ATOM compositeid term*);
compositeid:
(id) ':' (id) -> ^(ID id id);
term:
variable -> ^(VARIABLE variable)
| simpleid -> ^(SCONSTANT simpleid)
| compositeid -> ^(CONSTANT compositeid);
id : (STRING);
simpleid : '<' URLSTRING '>' | '<' STRING '>';
// TODO: FIXIT X1 can be parsed as variable
variable:
('?') id -> ^(id);
url : (URLSTRING);
URLSTRING : ('http://'|'file:/') ('a'..'z'|'A'..'Z'|'0'..'9'|'/'|'#'|'.'|'-'|'~'|'_')+;
STRING : ('a'..'z'|'A'..'Z'|'0'..'9'|'/'|'#'|'.'|'-'|'_')+;
WS : (' '|'\n'|'\r')+ {$channel=HIDDEN;} ;
|
