| package org.apache.xpath.parser; |
| |
| import java.util.Vector; |
| |
| import org.apache.xpath.functions.Function; |
| import org.apache.xpath.operations.Variable; |
| |
| public class PathExpr extends NonExecutableExpression |
| { |
| public PathExpr(XPath parser) |
| { |
| super(parser); |
| } |
| |
| /** |
| * Tell if this node is part of a PathExpr chain. For instance: |
| * <pre> |
| * |UnaryExpr |
| * | PathExpr |
| * | StepExpr |
| * | AxisChild child:: |
| * | NodeTest |
| * | NameTest |
| * | QName foo |
| * | Predicates * |
| * </pre><br/> |
| * In this example, UnaryExpr, PathExpr, and StepExpr should all return true. |
| */ |
| public boolean isPathExpr() |
| { |
| return true; |
| } |
| |
| |
| // public void jjtAddChild(Node n, int i) |
| // { |
| // n = fixupPrimarys(n); |
| // if(null == m_exprs) |
| // m_exprs = new Vector(); |
| // if(i >= m_exprs.size()) |
| // { |
| // m_exprs.setSize(i+1); |
| // } |
| // m_exprs.setElementAt(n, i); |
| // } |
| |
| public void jjtClose() |
| { |
| int size = m_exprs.size(); |
| for(int i = size-1; i >= 0; i--) |
| { |
| SimpleNode node = (SimpleNode)m_exprs.elementAt(i); |
| if(node instanceof SlashOrSlashSlash) |
| { |
| boolean isSlashSlash = ((SlashOrSlashSlash)node).getisSlashSlash(); |
| if(isSlashSlash) |
| { |
| node = new StepExpr(m_parser); |
| PatternAxis patAxis = new PatternAxis(org.apache.xml.dtm.Axis.DESCENDANTORSELF, m_parser); |
| patAxis.m_value = "descendant-or-self::"; // for diagnostics |
| NodeTest nt = new NodeTest(org.apache.xml.dtm.DTMFilter.SHOW_ALL, m_parser); |
| Predicates preds = new Predicates(m_parser); |
| node.jjtAddChild(patAxis, 0); |
| node.jjtAddChild(nt, 1); |
| node.jjtAddChild(preds, 2); |
| m_exprs.setElementAt(node, i); |
| } |
| else |
| m_exprs.removeElementAt(i); |
| // i--; |
| } |
| |
| } |
| Node child; |
| if((jjtGetNumChildren() == 1) |
| && (child = jjtGetChild(0)) instanceof StepExpr) |
| { |
| if(child.jjtGetNumChildren() == 2) |
| { |
| StepExpr stepExpr = (StepExpr)child; |
| if(stepExpr.getPredicates().jjtGetNumChildren() == 0) |
| { |
| Node varOrFunc = stepExpr.jjtGetChild(0); |
| if(varOrFunc instanceof Variable |
| || varOrFunc instanceof Function |
| || varOrFunc instanceof org.apache.xpath.patterns.FunctionPattern) |
| { |
| m_exprs.setElementAt(varOrFunc, 0); |
| varOrFunc.jjtSetParent(this); // parent will continue to reduce. |
| } |
| } |
| } |
| } |
| } |
| |
| |
| /** |
| * @see org.apache.xpath.parser.Node#jjtAddChild(Node, int) |
| */ |
| public void jjtAddChild(Node n, int i) |
| { |
| if (n instanceof StepExpr && n.jjtGetChild(0) instanceof Variable) |
| { |
| if (null == m_exprs) |
| m_exprs = new Vector(); |
| if (i >= m_exprs.size()) |
| { |
| m_exprs.setSize(i + 1); |
| } |
| m_exprs.setElementAt(n, i); |
| } |
| else |
| super.jjtAddChild(n, i); |
| } |
| |
| } |
| |