/// <summary>
/// Destructively Copies the whole MarkupString Structure into the given MarkupString Object.
/// </summary>
/// <param name="newMarkupString">The MarkupString object to copy into.</param>
/// <returns>The newMarkupString, now filled with this MarkupString's information.</returns>
public MarkupString CopyInto(MarkupString newMarkupString)
{
if (this.IsString())
{
newMarkupString.beneathList = null;
newMarkupString.stringWeight = null;
newMarkupString.MyMarkup = null;
newMarkupString.bareString = new StringBuilder();
newMarkupString.bareString.Append(this.bareString);
return(newMarkupString);
}
// Implied else.
newMarkupString.beneathList = new List <MarkupString>();
newMarkupString.stringWeight = new List <int>();
newMarkupString.MyMarkup = new Markup(this.MyMarkup);
foreach (MarkupString mySubMarkupString in this.beneathList)
{
newMarkupString.bareString = null;
var thisOne = new MarkupString();
newMarkupString.beneathList.Add(mySubMarkupString.CopyInto(thisOne));
newMarkupString.stringWeight.Add(thisOne.Weight());
}
return(newMarkupString);
}
/// <summary>
/// An edit function that replaces the position->range with a copy of the new MarkupString.
/// </summary>
/// <param name="newMarkupString">The new MarkupString to copy and insert into this structure.</param>
/// <param name="position">The position where the edit begins, based on an insert position.</param>
/// <param name="length">The length of string to 'replace' with this edit.</param>
/// <returns>The MarkupString itself.</returns>
public MarkupString Replace(MarkupString newMarkupString, int position, int length)
{
var replacement = new MarkupString(newMarkupString);
Insert(replacement, position);
Remove(position + replacement.Weight(), length);
return(this);
}
/// <summary>
/// This function returns the position of the MarkupString after concatenating two existing ones.
/// <remarks>It is up to another function to link this result in properly.</remarks>
/// </summary>
/// <param name="left">MarkupString on the left.</param>
/// <param name="right">MarkupString on the right.</param>
/// <returns>A MarkupString that simply has concatenated the two MarkupStrings.</returns>
public MarkupString Concat(MarkupString left, MarkupString right)
{
var newMarkupString = new MarkupString();
newMarkupString.beneathList.Add(left);
newMarkupString.stringWeight.Add(left.Weight());
newMarkupString.beneathList.Add(right);
newMarkupString.stringWeight.Add(right.Weight());
return(newMarkupString);
}
/// <summary>
/// The work-horse for destructively copying a substring set of a MarkupString into the given MarkupString object.
/// </summary>
/// <param name="newMarkupString">The MarkupString object to copy into.</param>
/// <param name="position">The zero-based starting character position in this instance.</param>
/// <param name="length">The number of characters in the substring.</param>
private void CopySubstringInto(MarkupString newMarkupString, int position, int length)
{
if (this.IsString())
{
newMarkupString.MyMarkup = null;
newMarkupString.beneathList = null;
newMarkupString.stringWeight = null;
newMarkupString.bareString = new StringBuilder(this.bareString.ToString().Substring(position, length));
}
else
{
newMarkupString.MyMarkup = new Markup(this.MyMarkup);
newMarkupString.beneathList = new List <MarkupString>();
newMarkupString.stringWeight = new List <int>();
newMarkupString.bareString = null;
// We can't do this in parallel. Must be done in-order.
foreach (MarkupString markupStringItem in this.beneathList)
{
// We're done if we have nothing else to add to the substring node.
if (length <= 0)
{
break;
}
// If the weight is less than the position, or equal to, this is not where we want to copy from.
// So reduce the relative-position and try again.
if (markupStringItem.Weight() <= position)
{
position -= markupStringItem.Weight();
continue;
}
int maxCut = markupStringItem.Weight() - position;
int curCut = maxCut < length ? maxCut : length;
var thisOne = new MarkupString();
markupStringItem.CopySubstringInto(thisOne, position, curCut);
newMarkupString.beneathList.Add(thisOne);
newMarkupString.stringWeight.Add(thisOne.Weight());
length -= curCut;
position = 0;
}
}
}
/// <summary>
/// Appends a MarkupString to the end of this instance of MarkupString.
/// </summary>
/// <param name="markupStringArg">The MarkupString being added to this instance.</param>
/// <returns>The MarkupString itself.</returns>
public MarkupString Append(MarkupString markupStringArg)
{
beneathList.Add(markupStringArg);
stringWeight.Add(markupStringArg.Weight());
return(this);
}
/// <summary>
/// The InsertString will put markupStringArg into the position in the MarkupString structure.
/// To do this, it may split up a string beneath it. After all, the node is expected to be Marked Up.
/// </summary>
/// <param name="markupStringArg">The MarkupString to insert. Please make sure to give it a Copy!</param>
/// <param name="position">The position into which to insert. See remarks for insertion logic.</param>
/// <returns>The MarkupString itself.</returns>
public MarkupString Insert(MarkupString markupStringArg, int position)
{
if (IsString())
{
beneathList = new List <MarkupString>();
stringWeight = new List <int>();
MyMarkup = new Markup(); // Blank Markup Transition
var rightside = bareString.ToString().Substring(position);
var leftside = bareString.ToString().Substring(0, bareString.Length - rightside.Length);
beneathList.Add(new MarkupString(leftside));
beneathList.Add(new MarkupString(markupStringArg));
beneathList.Add(new MarkupString(rightside));
bareString = null;
stringWeight.Add(beneathList[0].Weight());
stringWeight.Add(beneathList[1].Weight());
stringWeight.Add(beneathList[2].Weight());
}
else
{
var targetPosition = position;
// We need to find the way this string is now 'split', and leave the 'remainder' up to another call of InsertString.
var passedWeights = stringWeight.TakeWhile(val => (targetPosition -= val) >= 0).Count();
/* Warning: here, a position of 3 generates a targetPosition of -5 after noticing a weight 8. The position it needs to
* go into is 3. But had it passed over a weight of 2, the targetposition would be '1' for the /next/ unit. Which is correct.
*
* But if that had a weight of 4, it'd end up being 1-4 = -3. We need to re-add the last step, on which the evaluation failed.
*/
if (targetPosition == 0)
{
// We must place it 'between', at the beginning, or at the 'end' of a beneathList.
// We know how many elements in we should be... so:
// If count is at 0, it's an insert.
// If count is equal to stringWeight.Count, append at end.
// Otherwise, pass the new targetPosition to insert into the String.
beneathList.Insert(passedWeights, markupStringArg);
stringWeight.Insert(passedWeights, markupStringArg.Weight());
}
else
{
// This is the adjustment for the 'last step reduction' error.
targetPosition += stringWeight[passedWeights];
beneathList[passedWeights].Insert(markupStringArg, targetPosition);
stringWeight[passedWeights] += markupStringArg.Weight();
if (!beneathList[passedWeights].MyMarkup.IsOnlyInherit())
{
return(this);
}
// If the below is now an empty (OnlyInherit) Markup, we can 'pull it up'.
// That is to say, we can put its individual beneathLists in the position where we had our old one.
// If the item below is not an empty (OnlyInherit) Markup, then it wasn't the item below that we did
// the final insert into.
var reference = beneathList[passedWeights];
beneathList.RemoveAt(passedWeights);
stringWeight.RemoveAt(passedWeights);
beneathList.InsertRange(passedWeights, reference.beneathList);
stringWeight.InsertRange(passedWeights, reference.stringWeight);
}
}
return(this);
}
