/**
* translate an xpath path reference into a TreeReference
* TreeReferences only support a subset of true xpath paths; restrictions are:
* simple child name tests 'child::name', '.', and '..' allowed only
* no predicates
* all '..' steps must come before anything else
*/
public TreeReference getReference(Boolean allowPredicates)
{
TreeReference ref_ = new TreeReference();
Boolean parentsAllowed;
switch (init_context)
{
case XPathPathExpr.INIT_CONTEXT_ROOT:
ref_.setRefLevel(TreeReference.REF_ABSOLUTE);
parentsAllowed = false;
break;
case XPathPathExpr.INIT_CONTEXT_RELATIVE:
ref_.setRefLevel(0);
parentsAllowed = true;
break;
default: throw new XPathUnsupportedException("filter expression");
}
for (int i = 0; i < steps.Length; i++)
{
XPathStep step = steps[i];
if (!allowPredicates && step.predicates.Length > 0)
{
throw new XPathUnsupportedException("predicates");
}
if (step.axis == XPathStep.AXIS_SELF)
{
if (step.test != XPathStep.TEST_TYPE_NODE)
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
else if (step.axis == XPathStep.AXIS_PARENT)
{
if (!parentsAllowed || step.test != XPathStep.TEST_TYPE_NODE)
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
else
{
ref_.incrementRefLevel();
}
}
else if (step.axis == XPathStep.AXIS_ATTRIBUTE)
{
if (step.test == XPathStep.TEST_NAME)
{
ref_.add(step.name.ToString(), TreeReference.INDEX_ATTRIBUTE);
parentsAllowed = false;
//TODO: Can you step back from an attribute, or should this always be
//the last step?
}
else
{
throw new XPathUnsupportedException("attribute step other than 'attribute::name");
}
}
else if (step.axis == XPathStep.AXIS_CHILD)
{
if (step.test == XPathStep.TEST_NAME)
{
ref_.add(step.name.ToString(), TreeReference.INDEX_UNBOUND);
parentsAllowed = false;
}
else if (step.test == XPathStep.TEST_NAME_WILDCARD)
{
ref_.add(TreeReference.NAME_WILDCARD, TreeReference.INDEX_UNBOUND);
parentsAllowed = false;
}
else
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
else
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
return(ref_);
}
/// <summary> translate an xpath path reference into a TreeReference
/// TreeReferences only support a subset of true xpath paths; restrictions are:
/// simple child name tests 'child::name', '.', and '..' allowed only
/// no predicates
/// all '..' steps must come before anything else
/// </summary>
public virtual TreeReference getReference(bool allowPredicates)
{
TreeReference ref_Renamed = new TreeReference();
bool parentsAllowed;
switch (init_context)
{
case XPathPathExpr.INIT_CONTEXT_ROOT:
ref_Renamed.RefLevel = TreeReference.REF_ABSOLUTE;
parentsAllowed = false;
break;
case XPathPathExpr.INIT_CONTEXT_RELATIVE:
ref_Renamed.RefLevel = 0;
parentsAllowed = true;
break;
case XPathPathExpr.INIT_CONTEXT_EXPR:
if (this.filtExpr.x != null && this.filtExpr.x is XPathFuncExpr)
{
XPathFuncExpr func = (XPathFuncExpr)(this.filtExpr.x);
if (func.id.ToString().Equals("instance"))
{
ref_Renamed.RefLevel = TreeReference.REF_ABSOLUTE; //i assume when refering the non main instance you have to be absolute
parentsAllowed = false;
if (func.args.Length != 1)
{
throw new XPathUnsupportedException("instance() function used with " + func.args.Length + " arguements. Expecting 1 arguement");
}
if (!(func.args[0] is XPathStringLiteral))
{
throw new XPathUnsupportedException("instance() function expecting 1 string literal arguement arguement");
}
XPathStringLiteral strLit = (XPathStringLiteral)(func.args[0]);
//we've got a non-standard instance in play, watch out
if (strLit.s == null)
{
// absolute reference to the main instance
ref_Renamed.Context = TreeReference.CONTEXT_ABSOLUTE;
ref_Renamed.InstanceName = null;
}
else
{
ref_Renamed.Context = TreeReference.CONTEXT_INSTANCE;
ref_Renamed.InstanceName = strLit.s;
}
}
else
{
if (func.id.ToString().Equals("current"))
{
parentsAllowed = true;
ref_Renamed.Context = TreeReference.CONTEXT_ORIGINAL;
}
else
{
//We only support expression root contexts for instance refs, everything else is an illegal filter
throw new XPathUnsupportedException("filter expression");
}
}
}
else
{
//We only support expression root contexts for instance refs, everything else is an illegal filter
throw new XPathUnsupportedException("filter expression");
}
break;
default: throw new XPathUnsupportedException("filter expression");
}
for (int i = 0; i < steps.Length; i++)
{
XPathStep step = steps[i];
if (step.axis == XPathStep.AXIS_SELF)
{
if (step.test != XPathStep.TEST_TYPE_NODE)
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
else if (step.axis == XPathStep.AXIS_PARENT)
{
if (!parentsAllowed || step.test != XPathStep.TEST_TYPE_NODE)
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
else
{
ref_Renamed.incrementRefLevel();
}
}
else if (step.axis == XPathStep.AXIS_ATTRIBUTE)
{
if (step.test == XPathStep.TEST_NAME)
{
ref_Renamed.add(step.name.ToString(), TreeReference.INDEX_ATTRIBUTE);
parentsAllowed = false;
//TODO: Can you step back from an attribute, or should this always be
//the last step?
}
else
{
throw new XPathUnsupportedException("attribute step other than 'attribute::name");
}
}
else if (step.axis == XPathStep.AXIS_CHILD)
{
if (step.test == XPathStep.TEST_NAME)
{
ref_Renamed.add(step.name.ToString(), TreeReference.INDEX_UNBOUND);
parentsAllowed = true;
}
else if (step.test == XPathStep.TEST_NAME_WILDCARD)
{
ref_Renamed.add(TreeReference.NAME_WILDCARD, TreeReference.INDEX_UNBOUND);
parentsAllowed = true;
}
else
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
}
else
{
throw new XPathUnsupportedException("step other than 'child::name', '.', '..'");
}
if (step.predicates.Length > 0)
{
int refLevel = ref_Renamed.RefLevel;
List <XPathExpression> v = new List <XPathExpression>();
for (int j = 0; j < step.predicates.Length; j++)
{
v.addElement(step.predicates[j]);
}
ref_Renamed.addPredicate(i, v);
}
}
return(ref_Renamed);
}
public void print(Object o)
{
indent += 1;
if (o is XPathStringLiteral)
{
XPathStringLiteral x = (XPathStringLiteral)o;
printStr("strlit {" + x.s + "}");
}
else if (o is XPathNumericLiteral)
{
XPathNumericLiteral x = (XPathNumericLiteral)o;
printStr("numlit {" + x.d + "}");
}
else if (o is XPathVariableReference)
{
XPathVariableReference x = (XPathVariableReference)o;
printStr("var {" + x.id.ToString() + "}");
}
else if (o is XPathArithExpr)
{
XPathArithExpr x = (XPathArithExpr)o;
String op = null;
switch (x.op)
{
case XPathArithExpr.ADD: op = "add"; break;
case XPathArithExpr.SUBTRACT: op = "subtr"; break;
case XPathArithExpr.MULTIPLY: op = "mult"; break;
case XPathArithExpr.DIVIDE: op = "div"; break;
case XPathArithExpr.MODULO: op = "mod"; break;
}
printStr(op + " {{");
print(x.a);
printStr(" } {");
print(x.b);
printStr("}}");
}
else if (o is XPathBoolExpr)
{
XPathBoolExpr x = (XPathBoolExpr)o;
String op = null;
switch (x.op)
{
case XPathBoolExpr.AND: op = "and"; break;
case XPathBoolExpr.OR: op = "or"; break;
}
printStr(op + " {{");
print(x.a);
printStr(" } {");
print(x.b);
printStr("}}");
}
else if (o is XPathCmpExpr)
{
XPathCmpExpr x = (XPathCmpExpr)o;
String op = null;
switch (x.op)
{
case XPathCmpExpr.LT: op = "lt"; break;
case XPathCmpExpr.LTE: op = "lte"; break;
case XPathCmpExpr.GT: op = "gt"; break;
case XPathCmpExpr.GTE: op = "gte"; break;
}
printStr(op + " {{");
print(x.a);
printStr(" } {");
print(x.b);
printStr("}}");
}
else if (o is XPathEqExpr)
{
XPathEqExpr x = (XPathEqExpr)o;
String op = x.equal ? "eq" : "neq";
printStr(op + " {{");
print(x.a);
printStr(" } {");
print(x.b);
printStr("}}");
}
else if (o is XPathUnionExpr)
{
XPathUnionExpr x = (XPathUnionExpr)o;
printStr("union {{");
print(x.a);
printStr(" } {");
print(x.b);
printStr("}}");
}
else if (o is XPathNumNegExpr)
{
XPathNumNegExpr x = (XPathNumNegExpr)o;
printStr("neg {");
print(x.a);
printStr("}");
}
else if (o is XPathFuncExpr)
{
XPathFuncExpr x = (XPathFuncExpr)o;
if (x.args.Length == 0)
{
printStr("func {" + x.id.ToString() + ", args {none}}");
}
else
{
printStr("func {" + x.id.ToString() + ", args {{");
for (int i = 0; i < x.args.Length; i++)
{
print(x.args[i]);
if (i < x.args.Length - 1)
{
printStr(" } {");
}
}
printStr("}}}");
}
}
else if (o is XPathPathExpr)
{
XPathPathExpr x = (XPathPathExpr)o;
String init = null;
switch (x.init_context)
{
case XPathPathExpr.INIT_CONTEXT_ROOT: init = "root"; break;
case XPathPathExpr.INIT_CONTEXT_RELATIVE: init = "relative"; break;
case XPathPathExpr.INIT_CONTEXT_EXPR: init = "expr"; break;
}
printStr("path {init-context:" + init + ",");
if (x.init_context == XPathPathExpr.INIT_CONTEXT_EXPR)
{
printStr(" init-expr:{");
print(x.filtExpr);
printStr(" }");
}
if (x.steps.Length == 0)
{
printStr(" steps {none}");
printStr("}");
}
else
{
printStr(" steps {{");
for (int i = 0; i < x.steps.Length; i++)
{
print(x.steps[i]);
if (i < x.steps.Length - 1)
{
printStr(" } {");
}
}
printStr("}}}");
}
}
else if (o is XPathFilterExpr)
{
XPathFilterExpr x = (XPathFilterExpr)o;
printStr("filter-expr:{{");
print(x.x);
if (x.predicates.Length == 0)
{
printStr(" } predicates {none}}");
}
else
{
printStr(" } predicates {{");
for (int i = 0; i < x.predicates.Length; i++)
{
print(x.predicates[i]);
if (i < x.predicates.Length - 1)
{
printStr(" } {");
}
}
printStr(" }}}");
}
}
else if (o is XPathStep)
{
XPathStep x = (XPathStep)o;
String axis = null;
String test = null;
axis = XPathStep.axisStr(x.axis);
test = x.testStr();
if (x.predicates.Length == 0)
{
printStr("step {axis:" + axis + " test:" + test + " predicates {none}}");
}
else
{
printStr("step {axis:" + axis + " test:" + test + " predicates {{");
for (int i = 0; i < x.predicates.Length; i++)
{
print(x.predicates[i]);
if (i < x.predicates.Length - 1)
{
printStr(" } {");
}
}
printStr("}}}");
}
}
indent -= 1;
}