/// <summary>Locate or create the item node and set the value.</summary>
/// <remarks>
/// Locate or create the item node and set the value. Note the index
/// parameter is one-based! The index can be in the range [1..size + 1] or
/// "last()", normalize it and check the insert flags. The order of the
/// normalization checks is important. If the array is empty we end up with
/// an index and location to set item size + 1.
/// </remarks>
/// <param name="arrayNode">an array node</param>
/// <param name="itemIndex">the index where to insert the item</param>
/// <param name="itemValue">the item value</param>
/// <param name="itemOptions">the options for the new item</param>
/// <param name="insert">insert oder overwrite at index position?</param>
/// <exception cref="XmpException"/>
private void DoSetArrayItem(XmpNode arrayNode, int itemIndex, string itemValue, PropertyOptions itemOptions, bool insert)
{
var itemNode = new XmpNode(XmpConstants.ArrayItemName, null);
itemOptions = XmpNodeUtils.VerifySetOptions(itemOptions, itemValue);
// in insert mode the index after the last is allowed,
// even ARRAY_LAST_ITEM points to the index *after* the last.
var maxIndex = insert ? arrayNode.GetChildrenLength() + 1 : arrayNode.GetChildrenLength();
if (itemIndex == XmpConstants.ArrayLastItem)
{
itemIndex = maxIndex;
}
if (1 <= itemIndex && itemIndex <= maxIndex)
{
if (!insert)
{
arrayNode.RemoveChild(itemIndex);
}
arrayNode.AddChild(itemIndex, itemNode);
SetNode(itemNode, itemValue, itemOptions, false);
}
else
{
throw new XmpException("Array index out of bounds", XmpErrorCode.BadIndex);
}
}
/// <summary>
/// After processing by ExpandXPath, a step can be of these forms:
/// </summary>
/// <remarks>
/// After processing by ExpandXPath, a step can be of these forms:
/// <list type="bullet">
/// <item>qualName - A top level property or struct field.</item>
/// <item>[index] - An element of an array.</item>
/// <item>[last()] - The last element of an array.</item>
/// <item>[qualName="value"] - An element in an array of structs, chosen by a field value.</item>
/// <item>[?qualName="value"] - An element in an array, chosen by a qualifier value.</item>
/// <item>?qualName - A general qualifier.</item>
/// </list>
/// 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="XmpException"></exception>
private static XmpNode FollowXPathStep(XmpNode parentNode, XmpPathSegment nextStep, bool createNodes)
{
XmpNode nextNode = null;
var stepKind = nextStep.Kind;
switch (stepKind)
{
case XmpPathStepType.StructFieldStep:
nextNode = FindChildNode(parentNode, nextStep.Name, createNodes);
break;
case XmpPathStepType.QualifierStep:
nextNode = FindQualifierNode(parentNode, nextStep.Name.Substring(1), createNodes);
break;
default:
// This is an array indexing step. First get the index, then get the node.
if (!parentNode.Options.IsArray)
{
throw new XmpException("Indexing applied to non-array", XmpErrorCode.BadXPath);
}
int index;
switch (stepKind)
{
case XmpPathStepType.ArrayIndexStep:
index = FindIndexedItem(parentNode, nextStep.Name, createNodes);
break;
case XmpPathStepType.ArrayLastStep:
index = parentNode.GetChildrenLength();
break;
case XmpPathStepType.FieldSelectorStep:
Utils.SplitNameAndValue(nextStep.Name, out string fieldName, out string fieldValue);
index = LookupFieldSelector(parentNode, fieldName, fieldValue);
break;
case XmpPathStepType.QualSelectorStep:
Utils.SplitNameAndValue(nextStep.Name, out string qualName, out string qualValue);
index = LookupQualSelector(parentNode, qualName, qualValue, nextStep.AliasForm);
break;
default:
throw new XmpException("Unknown array indexing step in FollowXPathStep", XmpErrorCode.InternalFailure);
}
if (1 <= index && index <= parentNode.GetChildrenLength())
{
nextNode = parentNode.GetChild(index);
}
break;
}
return(nextNode);
}
/// <summary>The outermost call is special.</summary>
/// <remarks>
/// The outermost call is special. The names almost certainly differ. The
/// qualifiers (and hence options) will differ for an alias to the x-default
/// item of a langAlt array.
/// </remarks>
/// <param name="aliasNode">the alias node</param>
/// <param name="baseNode">the base node of the alias</param>
/// <param name="outerCall">marks the outer call of the recursion</param>
/// <exception cref="XmpException">Forwards XMP errors</exception>
private static void CompareAliasedSubtrees(XmpNode aliasNode, XmpNode baseNode, bool outerCall)
{
if (baseNode.Value != aliasNode.Value || aliasNode.GetChildrenLength() != baseNode.GetChildrenLength())
{
throw new XmpException("Mismatch between alias and base nodes", XmpErrorCode.BadXmp);
}
if (!outerCall && (baseNode.Name != aliasNode.Name || !aliasNode.Options.Equals(baseNode.Options) || aliasNode.GetQualifierLength() != baseNode.GetQualifierLength()))
{
throw new XmpException("Mismatch between alias and base nodes", XmpErrorCode.BadXmp);
}
for (IIterator an = aliasNode.IterateChildren(), bn = baseNode.IterateChildren(); an.HasNext() && bn.HasNext();)
{
var aliasChild = (XmpNode)an.Next();
var baseChild = (XmpNode)bn.Next();
CompareAliasedSubtrees(aliasChild, baseChild, false);
}
for (IIterator an = aliasNode.IterateQualifier(), bn1 = baseNode.IterateQualifier(); an.HasNext() && bn1.HasNext();)
{
var aliasQual = (XmpNode)an.Next();
var baseQual = (XmpNode)bn1.Next();
CompareAliasedSubtrees(aliasQual, baseQual, false);
}
}
/// <summary>
/// Searches for a field selector in a node:
/// [fieldName="value] - an element in an array of structs, chosen by a field value.
/// </summary>
/// <remarks>
/// Searches for a field selector in a node:
/// [fieldName="value] - an element in an array of structs, chosen by a field value.
/// No implicit nodes are created by field selectors.
/// </remarks>
/// <param name="arrayNode"/>
/// <param name="fieldName"/>
/// <param name="fieldValue"/>
/// <returns>Returns the index of the field if found, otherwise -1.</returns>
/// <exception cref="XmpException"></exception>
private static int LookupFieldSelector(XmpNode arrayNode, string fieldName, string fieldValue)
{
var result = -1;
for (var index = 1; index <= arrayNode.GetChildrenLength() && result < 0; index++)
{
var currItem = arrayNode.GetChild(index);
if (!currItem.Options.IsStruct)
{
throw new XmpException("Field selector must be used on array of struct", XmpErrorCode.BadXPath);
}
for (var f = 1; f <= currItem.GetChildrenLength(); f++)
{
var currField = currItem.GetChild(f);
if (currField.Name != fieldName ||
currField.Value != fieldValue)
{
continue;
}
result = index;
break;
}
}
return(result);
}
/// <summary>Make sure the x-default item is first.</summary>
/// <remarks>
/// Make sure the x-default item is first. Touch up "single value"
/// arrays that have a default plus one real language. This case should have
/// the same value for both items. Older Adobe apps were hardwired to only
/// use the "x-default" item, so we copy that value to the other
/// item.
/// </remarks>
/// <param name="arrayNode">an alt text array node</param>
internal static void NormalizeLangArray(XmpNode arrayNode)
{
if (!arrayNode.Options.IsArrayAltText)
{
return;
}
// check if node with x-default qual is first place
for (var i = 2; i <= arrayNode.GetChildrenLength(); i++)
{
var child = arrayNode.GetChild(i);
if (child.HasQualifier && XmpConstants.XDefault.Equals(child.GetQualifier(1).Value))
{
// move node to first place
try
{
arrayNode.RemoveChild(i);
arrayNode.AddChild(1, child);
}
catch (XmpException)
{
// cannot occur, because same child is removed before
Debug.Assert(false);
}
if (i == 2)
{
arrayNode.GetChild(2).Value = child.Value;
}
break;
}
}
}
/// <summary>
/// Searches for a qualifier selector in a node:
/// [?qualName="value"] - an element in an array, chosen by a qualifier value.
/// </summary>
/// <remarks>
/// Searches for a qualifier selector in a node:
/// [?qualName="value"] - an element in an array, chosen by a qualifier value.
/// No implicit nodes are created for qualifier selectors,
/// except for an alias to an x-default item.
/// </remarks>
/// <param name="arrayNode">an array node</param>
/// <param name="qualName">the qualifier name</param>
/// <param name="qualValue">the qualifier value</param>
/// <param name="aliasForm">
/// in case the qual selector results from an alias,
/// an x-default node is created if there has not been one.
/// </param>
/// <returns>Returns the index of th</returns>
/// <exception cref="XmpException"></exception>
private static int LookupQualSelector(XmpNode arrayNode, string qualName, string qualValue, int aliasForm)
{
if (XmpConstants.XmlLang.Equals(qualName))
{
qualValue = Utils.NormalizeLangValue(qualValue);
var index = LookupLanguageItem(arrayNode, qualValue);
if (index < 0 && (aliasForm & AliasOptions.PropArrayAltText) > 0)
{
var langNode = new XmpNode(XmpConstants.ArrayItemName, null);
var xdefault = new XmpNode(XmpConstants.XmlLang, XmpConstants.XDefault, null);
langNode.AddQualifier(xdefault);
arrayNode.AddChild(1, langNode);
return(1);
}
return(index);
}
for (var index = 1; index < arrayNode.GetChildrenLength(); index++)
{
var currItem = arrayNode.GetChild(index);
for (var it = currItem.IterateQualifier(); it.HasNext();)
{
var qualifier = (XmpNode)it.Next();
if (qualName.Equals(qualifier.Name) && qualValue.Equals(qualifier.Value))
{
return(index);
}
}
}
return(-1);
}
/// <param name="arrayNode">an array node</param>
/// <param name="segment">the segment containing the array index</param>
/// <param name="createNodes">flag if new nodes are allowed to be created.</param>
/// <returns>Returns the index or index = -1 if not found</returns>
/// <exception cref="XmpException">Throws Exceptions</exception>
private static int FindIndexedItem(XmpNode arrayNode, string segment, bool createNodes)
{
var index = 0;
try
{
segment = segment.Substring(1, segment.Length - 1 - 1);
index = Convert.ToInt32(segment);
if (index < 1)
{
throw new XmpException("Array index must be larger than zero", XmpErrorCode.BadXPath);
}
}
catch (FormatException)
{
throw new XmpException("Array index not digits.", XmpErrorCode.BadXPath);
}
if (createNodes && index == arrayNode.GetChildrenLength() + 1)
{
// Append a new last + 1 node.
var newItem = new XmpNode(XmpConstants.ArrayItemName, null)
{
IsImplicit = true
};
arrayNode.AddChild(newItem);
}
return(index);
}
/// <param name="arrayNode">an array node</param>
/// <param name="segment">the segment containing the array index</param>
/// <param name="createNodes">flag if new nodes are allowed to be created.</param>
/// <returns>Returns the index or index = -1 if not found</returns>
/// <exception cref="XmpException">Throws Exceptions</exception>
private static int FindIndexedItem(XmpNode arrayNode, string segment, bool createNodes)
{
if (!int.TryParse(segment.Substring(1, segment.Length - 1 - 1), out int index))
{
throw new XmpException("Array index not digits.", XmpErrorCode.BadXPath);
}
if (createNodes && index == arrayNode.GetChildrenLength() + 1)
{
// Append a new last + 1 node.
var newItem = new XmpNode(XmpConstants.ArrayItemName, null)
{
IsImplicit = true
};
arrayNode.AddChild(newItem);
}
return(index);
}
/// <summary>Looks for the appropriate language item in a text alternative array.item</summary>
/// <param name="arrayNode">an array node</param>
/// <param name="language">the requested language</param>
/// <returns>Returns the index if the language has been found, -1 otherwise.</returns>
/// <exception cref="XmpException"/>
internal static int LookupLanguageItem(XmpNode arrayNode, string language)
{
if (!arrayNode.Options.IsArray)
{
throw new XmpException("Language item must be used on array", XmpErrorCode.BadXPath);
}
for (var index = 1; index <= arrayNode.GetChildrenLength(); index++)
{
var child = arrayNode.GetChild(index);
if (!child.HasQualifier || !XmpConstants.XmlLang.Equals(child.GetQualifier(1).Name))
{
continue;
}
if (language.Equals(child.GetQualifier(1).Value))
{
return(index);
}
}
return(-1);
}
/// <summary>
/// Undo the denormalization performed by the XMP used in Acrobat 5.<br />
/// If a Dublin Core array had only one item, it was serialized as a simple
/// property.
/// </summary>
/// <remarks>
/// Undo the denormalization performed by the XMP used in Acrobat 5.<br />
/// If a Dublin Core array had only one item, it was serialized as a simple
/// property. <br />
/// The <c>xml:lang</c> attribute was dropped from an
/// <c>alt-text</c> item if the language was <c>x-default</c>.
/// </remarks>
/// <param name="dcSchema">the DC schema node</param>
/// <exception cref="XmpException">Thrown if normalization fails</exception>
private static void NormalizeDcArrays(XmpNode dcSchema)
{
for (var i = 1; i <= dcSchema.GetChildrenLength(); i++)
{
var currProp = dcSchema.GetChild(i);
var arrayForm = (PropertyOptions)_dcArrayForms[currProp.Name];
if (arrayForm == null)
{
continue;
}
if (currProp.Options.IsSimple)
{
// create a new array and add the current property as child,
// if it was formerly simple
var newArray = new XmpNode(currProp.Name, arrayForm);
currProp.Name = XmpConstants.ArrayItemName;
newArray.AddChild(currProp);
dcSchema.ReplaceChild(i, newArray);
// fix language alternatives
if (arrayForm.IsArrayAltText && !currProp.Options.HasLanguage)
{
var newLang = new XmpNode(XmpConstants.XmlLang, XmpConstants.XDefault, null);
currProp.AddQualifier(newLang);
}
}
else
{
// clear array options and add corrected array form if it has been an array before
currProp.Options.SetOption(PropertyOptions.ArrayFlag | PropertyOptions.ArrayOrderedFlag | PropertyOptions.ArrayAlternateFlag | PropertyOptions.ArrayAltTextFlag, false);
currProp.Options.MergeWith(arrayForm);
if (arrayForm.IsArrayAltText)
{
// applying for "dc:description", "dc:rights", "dc:title"
RepairAltText(currProp);
}
}
}
}
/// <summary>Compares two nodes including its children and qualifier.</summary>
/// <param name="leftNode">an <c>XMPNode</c></param>
/// <param name="rightNode">an <c>XMPNode</c></param>
/// <returns>Returns true if the nodes are equal, false otherwise.</returns>
/// <exception cref="XmpException">Forwards exceptions to the calling method.</exception>
private static bool ItemValuesMatch(XmpNode leftNode, XmpNode rightNode)
{
var leftForm = leftNode.Options;
var rightForm = rightNode.Options;
if (leftForm.Equals(rightForm))
{
return(false);
}
if (leftForm.GetOptions() == 0)
{
// Simple nodes, check the values and xml:lang qualifiers.
if (!leftNode.Value.Equals(rightNode.Value))
{
return(false);
}
if (leftNode.Options.HasLanguage != rightNode.Options.HasLanguage)
{
return(false);
}
if (leftNode.Options.HasLanguage && !leftNode.GetQualifier(1).Value.Equals(rightNode.GetQualifier(1).Value))
{
return(false);
}
}
else
{
if (leftForm.IsStruct)
{
// Struct nodes, see if all fields match, ignoring order.
if (leftNode.GetChildrenLength() != rightNode.GetChildrenLength())
{
return(false);
}
for (var it = leftNode.IterateChildren(); it.HasNext();)
{
var leftField = (XmpNode)it.Next();
var rightField = XmpNodeUtils.FindChildNode(rightNode, leftField.Name, false);
if (rightField == null || !ItemValuesMatch(leftField, rightField))
{
return(false);
}
}
}
else
{
// Array nodes, see if the "leftNode" values are present in the
// "rightNode", ignoring order, duplicates,
// and extra values in the rightNode-> The rightNode is the
// destination for AppendProperties.
Debug.Assert(leftForm.IsArray);
for (var il = leftNode.IterateChildren(); il.HasNext();)
{
var leftItem = (XmpNode)il.Next();
var match = false;
for (var ir = rightNode.IterateChildren(); ir.HasNext();)
{
var rightItem = (XmpNode)ir.Next();
if (ItemValuesMatch(leftItem, rightItem))
{
match = true;
break;
}
}
if (!match)
{
return(false);
}
}
}
}
return(true);
}
/// <summary>
/// After processing by ExpandXPath, a step can be of these forms:
/// </summary>
/// <remarks>
/// After processing by ExpandXPath, a step can be of these forms:
/// <list type="bullet">
/// <item>qualName - A top level property or struct field.</item>
/// <item>[index] - An element of an array.</item>
/// <item>[last()] - The last element of an array.</item>
/// <item>[qualName="value"] - An element in an array of structs, chosen by a field value.</item>
/// <item>[?qualName="value"] - An element in an array, chosen by a qualifier value.</item>
/// <item>?qualName - A general qualifier.</item>
/// </list>
/// 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="XmpException"></exception>
private static XmpNode FollowXPathStep(XmpNode parentNode, XmpPathSegment nextStep, bool createNodes)
{
XmpNode nextNode = null;
var stepKind = nextStep.Kind;
if (stepKind == XmpPath.StructFieldStep)
{
nextNode = FindChildNode(parentNode, nextStep.Name, createNodes);
}
else
{
if (stepKind == XmpPath.QualifierStep)
{
nextNode = FindQualifierNode(parentNode, nextStep.Name.Substring(1), createNodes);
}
else
{
// This is an array indexing step. First get the index, then get the node.
if (!parentNode.Options.IsArray)
{
throw new XmpException("Indexing applied to non-array", XmpErrorCode.BadXPath);
}
var index = 0;
if (stepKind == XmpPath.ArrayIndexStep)
{
index = FindIndexedItem(parentNode, nextStep.Name, createNodes);
}
else
{
if (stepKind == XmpPath.ArrayLastStep)
{
index = parentNode.GetChildrenLength();
}
else
{
if (stepKind == XmpPath.FieldSelectorStep)
{
var result = Utils.SplitNameAndValue(nextStep.Name);
var fieldName = result[0];
var fieldValue = result[1];
index = LookupFieldSelector(parentNode, fieldName, fieldValue);
}
else
{
if (stepKind == XmpPath.QualSelectorStep)
{
var result = Utils.SplitNameAndValue(nextStep.Name);
var qualName = result[0];
var qualValue = result[1];
index = LookupQualSelector(parentNode, qualName, qualValue, nextStep.AliasForm);
}
else
{
throw new XmpException("Unknown array indexing step in FollowXPathStep", XmpErrorCode.InternalFailure);
}
}
}
}
if (1 <= index && index <= parentNode.GetChildrenLength())
{
nextNode = parentNode.GetChild(index);
}
}
}
return(nextNode);
}
