// Six possible causes of exceptions in the builder:
// 1. Undefined prefix in a node test.
// 2. Undefined prefix in a variable reference, or unknown variable.
// 3. Undefined prefix in a function call, or unknown function, or wrong number/types of arguments.
// 4. Argument of Union operator is not a node-set.
// 5. First argument of Predicate is not a node-set.
// 6. Argument of Axis is not a node-set.
public Node Parse(string xpathExpr, IXPathBuilder <Node> builder)
{
Debug.Assert(this.scanner == null && this.builder == null);
Debug.Assert(builder != null);
Node result = default(Node);
this.scanner = new XPathScanner(xpathExpr);
this.builder = builder;
this.posInfo.Clear();
try {
builder.StartBuild();
result = ParseExpr();
scanner.CheckToken(LexKind.Eof);
}
catch (XPathParserException e) {
if (e.queryString == null)
{
e.queryString = scanner.Source;
PopPosInfo(out e.startChar, out e.endChar);
}
throw;
}
finally {
result = builder.EndBuild(result);
#if DEBUG
this.builder = null;
this.scanner = null;
#endif
}
Debug.Assert(posInfo.Count == 0, "PushPosInfo() and PopPosInfo() calls have been unbalanced");
return(result);
}
public Node Parse(XPathScanner scanner, IXPathBuilder <Node> builder, LexKind endLex)
{
Debug.Assert(_scanner == null && _builder == null);
Debug.Assert(scanner != null && builder != null);
Node result = default(Node);
_scanner = scanner;
_builder = builder;
_posInfo.Clear();
try
{
builder.StartBuild();
result = ParseExpr();
scanner.CheckToken(endLex);
}
catch (XPathCompileException e)
{
if (e.queryString == null)
{
e.queryString = scanner.Source;
PopPosInfo(out e.startChar, out e.endChar);
}
throw;
}
finally
{
result = builder.EndBuild(result);
#if DEBUG
_builder = null;
_scanner = null;
#endif
}
Debug.Assert(_posInfo.Count == 0, "PushPosInfo() and PopPosInfo() calls have been unbalanced");
return(result !);
}