From 9ce65c5a963b03ee97fe9cb6c5aa65a3c04a80a8 Mon Sep 17 00:00:00 2001
From: yzhou <yujiao.zhou@gmail.com>
Date: Tue, 21 Apr 2015 10:34:27 +0100
Subject: initial version

---
 .../karma2/model/cqparser/ConjunctiveQuery.g       | 140 +++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 src/org/semanticweb/karma2/model/cqparser/ConjunctiveQuery.g

(limited to 'src/org/semanticweb/karma2/model/cqparser/ConjunctiveQuery.g')

diff --git a/src/org/semanticweb/karma2/model/cqparser/ConjunctiveQuery.g b/src/org/semanticweb/karma2/model/cqparser/ConjunctiveQuery.g
new file mode 100644
index 0000000..621b0ce
--- /dev/null
+++ b/src/org/semanticweb/karma2/model/cqparser/ConjunctiveQuery.g
@@ -0,0 +1,140 @@
+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;} ;
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