Before Text and After Text from Track Changes

[tejkamalleo]

Hi Aspose Team,

We have a requirement in Word Document where we need to Extract Before Text and After Text from Track Changes.

Example :

1. A word(eg: “Tiger”) Is Deleted in a word document.I should be able to build response as .
   Before Text : “Tiger”
   After Text: “”
   Operation : “Delete”

2. A word(eg: “Tiger”) Is updated to new Word(eg: Cub) in a word document.I should be able to build response as .

Before Text : “Tiger”
After Text: “Cub”
Operation : “Update”

3. A word(eg: “Cub”) Is Inserted in a word document.I should be able to build response as .

Before Text : “”
After Text: “Cub”
Operation : “Insert”

---

Second Point is little tricky as in revisions/Revision Groups we have only inserrt,delete,move,format change but not update.

Can you please help me with a possibility to achieve this.

Thanks & Regards,
Kamal

[Vadim.Saltykov]

@tejkamalleo We can offer the following code.

bool skipNext = false;
for (int i = doc.Revisions.Count - 1; i != -1; i-- )
{
    if (skipNext)
    {
        skipNext = false;
        continue;
    }

    Revision curRevision = doc.Revisions[i];
    string curText = (curRevision.ParentNode as Run).Text;
    if (i > 0)
    {
        Revision prevRevision = doc.Revisions[i - 1];
        string prevText = (prevRevision.ParentNode as Run).Text;

        if (curRevision.RevisionType == RevisionType.Insertion &&
            prevRevision.RevisionType == RevisionType.Deletion &&
            (curRevision.ParentNode.PreviousSibling == prevRevision.ParentNode))
        {
            Console.WriteLine("Before: {0}; After: {1}; Operation: {2}", prevText, curText, "Edit");
            skipNext = true;
        }
    }
    if (!skipNext)
        switch (curRevision.RevisionType)
        {
            case RevisionType.Insertion:
                Console.WriteLine("Before: __; After: {0}; Operation: Insert", curText);
                break;
            case RevisionType.Deletion:
                Console.WriteLine("Before: {0}; After: __; Operation: Delete", curText);
                break;
        }
}

Please note, the code is very naive, does not contain all the necessary checks, and it serves only for demonstrating the idea.
The point is that we shall look for a pair of Delete-Insert revisions where the adjacent runs are involved.