/// <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="iText.Kernel.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", XMPError.BADXPATH);
}
String rootProp = VerifyXPathRoot(schemaNS, pos.path.JSubstring(pos.stepBegin, pos.stepEnd));
XMPAliasInfo aliasInfo = XMPMetaFactory.GetSchemaRegistry().FindAlias(rootProp);
if (aliasInfo == null)
{
// add schema xpath step
expandedXPath.Add(new XMPPathSegment(schemaNS, XMPPath.SCHEMA_NODE));
XMPPathSegment rootStep = new XMPPathSegment(rootProp, XMPPath.STRUCT_FIELD_STEP);
expandedXPath.Add(rootStep);
}
else
{
// add schema xpath step and base step of alias
expandedXPath.Add(new XMPPathSegment(aliasInfo.GetNamespace(), XMPPath.SCHEMA_NODE));
XMPPathSegment rootStep = new XMPPathSegment(VerifyXPathRoot(aliasInfo.GetNamespace(), aliasInfo.GetPropName
()), XMPPath.STRUCT_FIELD_STEP);
rootStep.SetAlias(true);
rootStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(rootStep);
if (aliasInfo.GetAliasForm().IsArrayAltText())
{
XMPPathSegment qualSelectorStep = new XMPPathSegment("[?xml:lang='x-default']", XMPPath.QUAL_SELECTOR_STEP
);
qualSelectorStep.SetAlias(true);
qualSelectorStep.SetAliasForm(aliasInfo.GetAliasForm().GetOptions());
expandedXPath.Add(qualSelectorStep);
}
else
{
if (aliasInfo.GetAliasForm().IsArray())
{
XMPPathSegment indexStep = new XMPPathSegment("[1]", XMPPath.ARRAY_INDEX_STEP);
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="iText.Kernel.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", XMPError.BADXPATH);
}
// ! Touch up later, also changing '@' to '?'.
XMPPathSegment segment = new XMPPathSegment(pos.path.JSubstring(pos.stepBegin, pos.stepEnd), XMPPath.STRUCT_FIELD_STEP
);
return(segment);
}
/// <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 an array index segment.</summary>
/// <param name="pos">the xmp path</param>
/// <returns>Returns the segment or an error</returns>
/// <exception cref="iText.Kernel.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.ARRAY_INDEX_STEP);
}
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", XMPError.BADXPATH);
}
if (pos.path[pos.stepEnd] == ']')
{
if (!"[last()".Equals(pos.path.JSubstring(pos.stepBegin, pos.stepEnd)))
{
throw new XMPException("Invalid non-numeric array index", XMPError.BADXPATH);
}
segment = new XMPPathSegment(null, XMPPath.ARRAY_LAST_STEP);
}
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", XMPError.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", XMPError.BADXPATH);
}
pos.stepEnd++;
// Absorb the trailing quote.
// ! Touch up later, also changing '@' to '?'.
segment = new XMPPathSegment(null, XMPPath.FIELD_SELECTOR_STEP);
}
}
if (pos.stepEnd >= pos.path.Length || pos.path[pos.stepEnd] != ']')
{
throw new XMPException("Missing ']' for array index", XMPError.BADXPATH);
}
pos.stepEnd++;
segment.SetName(pos.path.JSubstring(pos.stepBegin, pos.stepEnd));
return(segment);
}