xpathparser.java

java1.6众多例子参考

		nodeType = (name.toString().equals("*")) ? -1
				: _xsltc.registerNamespacePrefix(name);;
            }
	    else {
		final String uri = name.getNamespace();
		final String local = name.getLocalPart();
		final QName namespace_uri = 
		    _parser.getQNameIgnoreDefaultNs("namespace-uri");

		// Expand {uri}:* to *[namespace-uri() = 'uri'] - same for @*
		if (uri != null && (local.equals("*") || local.equals("@*"))) {
		    if (predicates == null) {
			predicates = new Vector(2);
		    }

		    // Priority is set by hand if no other predicates exist
		    setPriority = (predicates.size() == 0);

		    predicates.add(
			new Predicate(
			    new EqualityExpr(Operators.EQ, 
				new NamespaceUriCall(namespace_uri), 
				new LiteralExpr(uri))));
		}

		if (local.equals("*")) {
		    nodeType = (axis == Axis.ATTRIBUTE) ? NodeTest.ATTRIBUTE
			: NodeTest.ELEMENT;
		}
		else if (local.equals("@*")) {
		    nodeType = NodeTest.ATTRIBUTE;
		}
		else {
		    nodeType = (axis == Axis.ATTRIBUTE) ? _xsltc.registerAttribute(name)
			: _xsltc.registerElement(name); 
		}
	    }

	    final StepPattern result = new StepPattern(axis, nodeType, predicates); 

	    // Set priority for case prefix:* and prefix:@* (no predicates)
	    if (setPriority) {
		result.setPriority(-0.25);
	    }

	    return result;
	}
    }

    public int findNodeType(int axis, Object test) {
	if (test == null) {  // *
	    return (axis == Axis.ATTRIBUTE) ? 
		NodeTest.ATTRIBUTE :
		(axis == Axis.NAMESPACE) ? -1 : NodeTest.ELEMENT;
        }
        else if (test instanceof Integer) {
            return ((Integer)test).intValue();
        }
        else {
	    QName name = (QName)test;

	    if (axis == Axis.NAMESPACE) {
		return (name.toString().equals("*")) ? -1
		    : _xsltc.registerNamespacePrefix(name);
            }

	    if (name.getNamespace() == null) {
		final String local = name.getLocalPart();

		if (local.equals("*")) {
		    return (axis == Axis.ATTRIBUTE) ? NodeTest.ATTRIBUTE
			: NodeTest.ELEMENT;
		}
		else if (local.equals("@*")) {
		    return NodeTest.ATTRIBUTE;
		}
	    }

	    return (axis == Axis.ATTRIBUTE) ? _xsltc.registerAttribute(name)
		: _xsltc.registerElement(name); 
        }
    }

    /**
     * Parse the expression passed to the current scanner. If this
     * expression contains references to local variables and it will be 
     * compiled in an external module (not in the main class) request 
     * the current template to create a new variable stack frame.
     *
     * @param lineNumber Line where the current expression is defined.
     * @param external   Set to <tt>true</tt> if this expression is
     *                   compiled in a separate module.
     * 
     */
    public Symbol parse(String expression, int lineNumber) throws Exception {
        try {
	    _expression = expression;
	    _lineNumber = lineNumber;
	    return super.parse();
        }
        catch (IllegalCharException e) {
            ErrorMsg err = new ErrorMsg(ErrorMsg.ILLEGAL_CHAR_ERR,
                                        lineNumber, e.getMessage());
            _parser.reportError(Constants.FATAL, err);
        }
        return null;
    }

    /**
     * Lookup a variable or parameter in the symbol table given its name. 
     *
     * @param name Name of the symbol being looked up.
     */
    final SyntaxTreeNode lookupName(QName name) {
        // Is it a local var or param ?
        final SyntaxTreeNode result = _parser.lookupVariable(name);
	if (result != null)
            return(result);
        else
	    return(_symbolTable.lookupName(name));
    }

    public final void addError(ErrorMsg error) {
	_parser.reportError(Constants.ERROR, error);
    } 
           
    public void report_error(String message, Object info) {
	final ErrorMsg err = new ErrorMsg(ErrorMsg.SYNTAX_ERR, _lineNumber, 
	    _expression);
	_parser.reportError(Constants.FATAL, err);
    }

    public void report_fatal_error(String message, Object info) {
        // empty
    }
    
    public RelativeLocationPath insertStep(Step step, RelativeLocationPath rlp) {
	if (rlp instanceof Step) {
	    return new ParentLocationPath(step, (Step) rlp);
	}
	else if (rlp instanceof ParentLocationPath) {
	    final ParentLocationPath plp = (ParentLocationPath) rlp;
	    final RelativeLocationPath newrlp = insertStep(step, plp.getPath());
	    return new ParentLocationPath(newrlp, plp.getStep());
	}
	else {
	    addError(new ErrorMsg(ErrorMsg.INTERNAL_ERR, "XPathParser.insertStep"));
	    return rlp;
	}
    }

    /**
     * Returns true if the axis applies to elements only. The axes
     * child, attribute, namespace, descendant result in non-empty
     * nodesets only if the context node is of type element.
     */
    public boolean isElementAxis(int axis) {
	return (axis == Axis.CHILD || axis == Axis.ATTRIBUTE ||
		axis == Axis.NAMESPACE || axis == Axis.DESCENDANT);
    }

}

/** Cup generated class to encapsulate user supplied action code.*/
class CUP$XPathParser$actions {
  private final XPathParser parser;

  /** Constructor */
  CUP$XPathParser$actions(XPathParser parser) {
    this.parser = parser;
  }

  /** Method with the actual generated action code. */
  public final com.sun.java_cup.internal.runtime.Symbol CUP$XPathParser$do_action(
    int                        CUP$XPathParser$act_num,
    com.sun.java_cup.internal.runtime.lr_parser CUP$XPathParser$parser,
    java.util.Stack            CUP$XPathParser$stack,
    int                        CUP$XPathParser$top)
    throws java.lang.Exception
    {
      /* Symbol object for return from actions */
      com.sun.java_cup.internal.runtime.Symbol CUP$XPathParser$result;

      /* select the action based on the action number */
      switch (CUP$XPathParser$act_num)
        {
          /*. . . . . . . . . . . . . . . . . . . .*/
          case 140: // QName ::= ID 
            {
              QName RESULT = null;
		 RESULT = parser.getQNameIgnoreDefaultNs("id"); 
              CUP$XPathParser$result = new com.sun.java_cup.internal.runtime.Symbol(37/*QName*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).right, RESULT);
            }
          return CUP$XPathParser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 139: // QName ::= SELF 
            {
              QName RESULT = null;
		 RESULT = parser.getQNameIgnoreDefaultNs("self"); 
              CUP$XPathParser$result = new com.sun.java_cup.internal.runtime.Symbol(37/*QName*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).right, RESULT);
            }
          return CUP$XPathParser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 138: // QName ::= PRECEDINGSIBLING 
            {
              QName RESULT = null;
		 RESULT = parser.getQNameIgnoreDefaultNs("preceding-sibling"); 
              CUP$XPathParser$result = new com.sun.java_cup.internal.runtime.Symbol(37/*QName*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).right, RESULT);
            }
          return CUP$XPathParser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 137: // QName ::= PRECEDING 
            {
              QName RESULT = null;
		 RESULT = parser.getQNameIgnoreDefaultNs("preceding"); 
              CUP$XPathParser$result = new com.sun.java_cup.internal.runtime.Symbol(37/*QName*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).right, RESULT);
            }
          return CUP$XPathParser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 136: // QName ::= PARENT 
            {
              QName RESULT = null;
		 RESULT = parser.getQNameIgnoreDefaultNs("parent"); 
              CUP$XPathParser$result = new com.sun.java_cup.internal.runtime.Symbol(37/*QName*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$XPathParser$stack.elementAt(CUP$XPathParser$top-0)).right, RESULT);
            }
          return CUP$XPathParser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 135: // QName ::= NAMESPACE 
            {
              QName RESULT = null;
		 RESULT = parser.getQNameIgnoreDefaultNs("namesp