/// <summary>
/// Parses the root node of an XMP Path, checks if namespace and prefix fit together
/// and resolve the property to the base property if it is an alias.
/// </summary>
/// <param name="schemaNS">the root namespace</param>
/// <param name="pos">the parsing position helper</param>
/// <param name="expandedXPath">the path to contribute to</param>
/// <exception cref="Com.Adobe.Xmp.XMPException">If the path is not valid.</exception>
private static void ParseRootNode(string schemaNS, PathPosition pos, XMPPath expandedXPath)
{
while (pos.stepEnd < pos.path.Length && "/[*".IndexOf(pos.path[pos.stepEnd]) < 0)
{
pos.stepEnd++;
}
if (pos.stepEnd == pos.stepBegin)
{
throw new XMPException("Empty initial XMPPath step", XMPErrorConstants.Badxpath);
}
string rootProp = VerifyXPathRoot(schemaNS, Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd));
XMPAliasInfo aliasInfo = XMPMetaFactory.GetSchemaRegistry().FindAlias(rootProp);
if (aliasInfo == null)
{
// add schema xpath step
expandedXPath.Add(new XMPPathSegment(schemaNS, XMPPath.SchemaNode));
XMPPathSegment rootStep = new XMPPathSegment(rootProp, XMPPath.StructFieldStep);
expandedXPath.Add(rootStep);
}
else
{
// add schema xpath step and base step of alias
expandedXPath.Add(new XMPPathSegment(aliasInfo.GetNamespace(), XMPPath.SchemaNode));
XMPPathSegment rootStep = new XMPPathSegment(VerifyXPathRoot(aliasInfo.GetNamespace(), aliasInfo.GetPropName()), XMPPath.StructFieldStep);
rootStep.SetAlias(true);
rootStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(rootStep);
if (aliasInfo.GetAliasForm().IsArrayAltText())
{
XMPPathSegment qualSelectorStep = new XMPPathSegment("[?xml:lang='x-default']", XMPPath.QualSelectorStep);
qualSelectorStep.SetAlias(true);
qualSelectorStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(qualSelectorStep);
}
else
{
if (aliasInfo.GetAliasForm().IsArray())
{
XMPPathSegment indexStep = new XMPPathSegment("[1]", XMPPath.ArrayIndexStep);
indexStep.SetAlias(true);
indexStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(indexStep);
}
}
}
}
/// <summary>Parses a struct segment</summary>
/// <param name="pos">the current position in the path</param>
/// <returns>Retusn the segment or an errror</returns>
/// <exception cref="Com.Adobe.Xmp.XMPException">If the sement is empty</exception>
private static XMPPathSegment ParseStructSegment(PathPosition pos)
{
pos.nameStart = pos.stepBegin;
while (pos.stepEnd < pos.path.Length && "/[*".IndexOf(pos.path[pos.stepEnd]) < 0)
{
pos.stepEnd++;
}
pos.nameEnd = pos.stepEnd;
if (pos.stepEnd == pos.stepBegin)
{
throw new XMPException("Empty XMPPath segment", XMPErrorConstants.Badxpath);
}
// ! Touch up later, also changing '@' to '?'.
XMPPathSegment segment = new XMPPathSegment(Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd), XMPPath.StructFieldStep);
return(segment);
}
/// <summary>Parses an array index segment.</summary>
/// <param name="pos">the xmp path</param>
/// <returns>Returns the segment or an error</returns>
/// <exception cref="Com.Adobe.Xmp.XMPException">thrown on xmp path errors</exception>
private static XMPPathSegment ParseIndexSegment(PathPosition pos)
{
XMPPathSegment segment;
pos.stepEnd++;
// Look at the character after the leading '['.
if ('0' <= pos.path[pos.stepEnd] && pos.path[pos.stepEnd] <= '9')
{
// A numeric (decimal integer) array index.
while (pos.stepEnd < pos.path.Length && '0' <= pos.path[pos.stepEnd] && pos.path[pos.stepEnd] <= '9')
{
pos.stepEnd++;
}
segment = new XMPPathSegment(null, XMPPath.ArrayIndexStep);
}
else
{
// Could be "[last()]" or one of the selector forms. Find the ']' or '='.
while (pos.stepEnd < pos.path.Length && pos.path[pos.stepEnd] != ']' && pos.path[pos.stepEnd] != '=')
{
pos.stepEnd++;
}
if (pos.stepEnd >= pos.path.Length)
{
throw new XMPException("Missing ']' or '=' for array index", XMPErrorConstants.Badxpath);
}
if (pos.path[pos.stepEnd] == ']')
{
if (!"[last()".Equals(Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd)))
{
throw new XMPException("Invalid non-numeric array index", XMPErrorConstants.Badxpath);
}
segment = new XMPPathSegment(null, XMPPath.ArrayLastStep);
}
else
{
pos.nameStart = pos.stepBegin + 1;
pos.nameEnd = pos.stepEnd;
pos.stepEnd++;
// Absorb the '=', remember the quote.
char quote = pos.path[pos.stepEnd];
if (quote != '\'' && quote != '"')
{
throw new XMPException("Invalid quote in array selector", XMPErrorConstants.Badxpath);
}
pos.stepEnd++;
// Absorb the leading quote.
while (pos.stepEnd < pos.path.Length)
{
if (pos.path[pos.stepEnd] == quote)
{
// check for escaped quote
if (pos.stepEnd + 1 >= pos.path.Length || pos.path[pos.stepEnd + 1] != quote)
{
break;
}
pos.stepEnd++;
}
pos.stepEnd++;
}
if (pos.stepEnd >= pos.path.Length)
{
throw new XMPException("No terminating quote for array selector", XMPErrorConstants.Badxpath);
}
pos.stepEnd++;
// Absorb the trailing quote.
// ! Touch up later, also changing '@' to '?'.
segment = new XMPPathSegment(null, XMPPath.FieldSelectorStep);
}
}
if (pos.stepEnd >= pos.path.Length || pos.path[pos.stepEnd] != ']')
{
throw new XMPException("Missing ']' for array index", XMPErrorConstants.Badxpath);
}
pos.stepEnd++;
segment.SetName(Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd));
return(segment);
}
/// <summary>
/// After processing by ExpandXPath, a step can be of these forms:
/// <ul>
/// <li>qualName - A top level property or struct field.
/// </summary>
/// <remarks>
/// After processing by ExpandXPath, a step can be of these forms:
/// <ul>
/// <li>qualName - A top level property or struct field.
/// <li>[index] - An element of an array.
/// <li>[last()] - The last element of an array.
/// <li>[qualName="value"] - An element in an array of structs, chosen by a field value.
/// <li>[?qualName="value"] - An element in an array, chosen by a qualifier value.
/// <li>?qualName - A general qualifier.
/// </ul>
/// Find the appropriate child node, resolving aliases, and optionally creating nodes.
/// </remarks>
/// <param name="parentNode">the node to start to start from</param>
/// <param name="nextStep">the xpath segment</param>
/// <param name="createNodes"></param>
/// <returns>returns the found or created XMPPath node</returns>
/// <exception cref="Com.Adobe.Xmp.XMPException"></exception>
private static XMPNode FollowXPathStep(XMPNode parentNode, XMPPathSegment nextStep, bool createNodes)
{
XMPNode nextNode = null;
int index = 0;
int stepKind = nextStep.GetKind();
if (stepKind == XMPPath.StructFieldStep)
{
nextNode = FindChildNode(parentNode, nextStep.GetName(), createNodes);
}
else
{
if (stepKind == XMPPath.QualifierStep)
{
nextNode = FindQualifierNode(parentNode, Sharpen.Runtime.Substring(nextStep.GetName(), 1), createNodes);
}
else
{
// This is an array indexing step. First get the index, then get the node.
if (!parentNode.GetOptions().IsArray())
{
throw new XMPException("Indexing applied to non-array", XMPErrorConstants.Badxpath);
}
if (stepKind == XMPPath.ArrayIndexStep)
{
index = FindIndexedItem(parentNode, nextStep.GetName(), createNodes);
}
else
{
if (stepKind == XMPPath.ArrayLastStep)
{
index = parentNode.GetChildrenLength();
}
else
{
if (stepKind == XMPPath.FieldSelectorStep)
{
string[] result = Utils.SplitNameAndValue(nextStep.GetName());
string fieldName = result[0];
string fieldValue = result[1];
index = LookupFieldSelector(parentNode, fieldName, fieldValue);
}
else
{
if (stepKind == XMPPath.QualSelectorStep)
{
string[] result = Utils.SplitNameAndValue(nextStep.GetName());
string qualName = result[0];
string qualValue = result[1];
index = LookupQualSelector(parentNode, qualName, qualValue, nextStep.GetAliasForm());
}
else
{
throw new XMPException("Unknown array indexing step in FollowXPathStep", XMPErrorConstants.Internalfailure);
}
}
}
}
if (1 <= index && index <= parentNode.GetChildrenLength())
{
nextNode = parentNode.GetChild(index);
}
}
}
return nextNode;
}
// Bits for XPathStepInfo options.
//
/// <summary>Append a path segment</summary>
/// <param name="segment">the segment to add</param>
public virtual void Add(XMPPathSegment segment)
{
segments.Add(segment);
}
// Bits for XPathStepInfo options.
//
/// <summary>Append a path segment</summary>
/// <param name="segment">the segment to add</param>
public virtual void Add(XMPPathSegment segment)
{
segments.Add(segment);
}
/// <summary>
/// Parses the root node of an XMP Path, checks if namespace and prefix fit together
/// and resolve the property to the base property if it is an alias.
/// </summary>
/// <param name="schemaNS">the root namespace</param>
/// <param name="pos">the parsing position helper</param>
/// <param name="expandedXPath">the path to contribute to</param>
/// <exception cref="Com.Adobe.Xmp.XMPException">If the path is not valid.</exception>
private static void ParseRootNode(string schemaNS, PathPosition pos, XMPPath expandedXPath)
{
while (pos.stepEnd < pos.path.Length && "/[*".IndexOf(pos.path[pos.stepEnd]) < 0)
{
pos.stepEnd++;
}
if (pos.stepEnd == pos.stepBegin)
{
throw new XMPException("Empty initial XMPPath step", XMPErrorConstants.Badxpath);
}
string rootProp = VerifyXPathRoot(schemaNS, Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd));
XMPAliasInfo aliasInfo = XMPMetaFactory.GetSchemaRegistry().FindAlias(rootProp);
if (aliasInfo == null)
{
// add schema xpath step
expandedXPath.Add(new XMPPathSegment(schemaNS, XMPPath.SchemaNode));
XMPPathSegment rootStep = new XMPPathSegment(rootProp, XMPPath.StructFieldStep);
expandedXPath.Add(rootStep);
}
else
{
// add schema xpath step and base step of alias
expandedXPath.Add(new XMPPathSegment(aliasInfo.GetNamespace(), XMPPath.SchemaNode));
XMPPathSegment rootStep = new XMPPathSegment(VerifyXPathRoot(aliasInfo.GetNamespace(), aliasInfo.GetPropName()), XMPPath.StructFieldStep);
rootStep.SetAlias(true);
rootStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(rootStep);
if (aliasInfo.GetAliasForm().IsArrayAltText())
{
XMPPathSegment qualSelectorStep = new XMPPathSegment("[?xml:lang='x-default']", XMPPath.QualSelectorStep);
qualSelectorStep.SetAlias(true);
qualSelectorStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(qualSelectorStep);
}
else
{
if (aliasInfo.GetAliasForm().IsArray())
{
XMPPathSegment indexStep = new XMPPathSegment("[1]", XMPPath.ArrayIndexStep);
indexStep.SetAlias(true);
indexStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(indexStep);
}
}
}
}
/// <summary>Parses an array index segment.</summary>
/// <param name="pos">the xmp path</param>
/// <returns>Returns the segment or an error</returns>
/// <exception cref="Com.Adobe.Xmp.XMPException">thrown on xmp path errors</exception>
private static XMPPathSegment ParseIndexSegment(PathPosition pos)
{
XMPPathSegment segment;
pos.stepEnd++;
// Look at the character after the leading '['.
if ('0' <= pos.path[pos.stepEnd] && pos.path[pos.stepEnd] <= '9')
{
// A numeric (decimal integer) array index.
while (pos.stepEnd < pos.path.Length && '0' <= pos.path[pos.stepEnd] && pos.path[pos.stepEnd] <= '9')
{
pos.stepEnd++;
}
segment = new XMPPathSegment(null, XMPPath.ArrayIndexStep);
}
else
{
// Could be "[last()]" or one of the selector forms. Find the ']' or '='.
while (pos.stepEnd < pos.path.Length && pos.path[pos.stepEnd] != ']' && pos.path[pos.stepEnd] != '=')
{
pos.stepEnd++;
}
if (pos.stepEnd >= pos.path.Length)
{
throw new XMPException("Missing ']' or '=' for array index", XMPErrorConstants.Badxpath);
}
if (pos.path[pos.stepEnd] == ']')
{
if (!"[last()".Equals(Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd)))
{
throw new XMPException("Invalid non-numeric array index", XMPErrorConstants.Badxpath);
}
segment = new XMPPathSegment(null, XMPPath.ArrayLastStep);
}
else
{
pos.nameStart = pos.stepBegin + 1;
pos.nameEnd = pos.stepEnd;
pos.stepEnd++;
// Absorb the '=', remember the quote.
char quote = pos.path[pos.stepEnd];
if (quote != '\'' && quote != '"')
{
throw new XMPException("Invalid quote in array selector", XMPErrorConstants.Badxpath);
}
pos.stepEnd++;
// Absorb the leading quote.
while (pos.stepEnd < pos.path.Length)
{
if (pos.path[pos.stepEnd] == quote)
{
// check for escaped quote
if (pos.stepEnd + 1 >= pos.path.Length || pos.path[pos.stepEnd + 1] != quote)
{
break;
}
pos.stepEnd++;
}
pos.stepEnd++;
}
if (pos.stepEnd >= pos.path.Length)
{
throw new XMPException("No terminating quote for array selector", XMPErrorConstants.Badxpath);
}
pos.stepEnd++;
// Absorb the trailing quote.
// ! Touch up later, also changing '@' to '?'.
segment = new XMPPathSegment(null, XMPPath.FieldSelectorStep);
}
}
if (pos.stepEnd >= pos.path.Length || pos.path[pos.stepEnd] != ']')
{
throw new XMPException("Missing ']' for array index", XMPErrorConstants.Badxpath);
}
pos.stepEnd++;
segment.SetName(Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd));
return segment;
}
/// <summary>Parses a struct segment</summary>
/// <param name="pos">the current position in the path</param>
/// <returns>Retusn the segment or an errror</returns>
/// <exception cref="Com.Adobe.Xmp.XMPException">If the sement is empty</exception>
private static XMPPathSegment ParseStructSegment(PathPosition pos)
{
pos.nameStart = pos.stepBegin;
while (pos.stepEnd < pos.path.Length && "/[*".IndexOf(pos.path[pos.stepEnd]) < 0)
{
pos.stepEnd++;
}
pos.nameEnd = pos.stepEnd;
if (pos.stepEnd == pos.stepBegin)
{
throw new XMPException("Empty XMPPath segment", XMPErrorConstants.Badxpath);
}
// ! Touch up later, also changing '@' to '?'.
XMPPathSegment segment = new XMPPathSegment(Sharpen.Runtime.Substring(pos.path, pos.stepBegin, pos.stepEnd), XMPPath.StructFieldStep);
return segment;
}
