[js/cs4] diff'ing texts

I would like to use Extendscript to compare two texts (e.g. from two text frames) and display the differences to the user in a sensible format. I don't care about the text formatting, whitespace and such changes.
My current approach is to:
1) Fetch the contents from the two text frames.
2) Compare the contents using a javascript I found on the Internet ("jsdiff.js")
3) Save the result into a local html work file along with a wee bit of html decoration.
4) Open the file using the execute method, thus displaying the result in a web browser.
It works decently, but I would still prefer a more elegant and integrated approach. Could be that someone in this forum has a better approach...
For instance, is there any of the inDesign UI or ScriptUI widgets that will render html properly (I couldn't spot it)?
Another approach would have been to generate pdfs with the texts and use BridgeTalk to open them in Acrobats "Compare documents" window. However, you seem to have very limited control over this function.
Any suggestions would be appreciated.
Thanks,
- Peder

Hi Oscar et al.
I got to look at it now, so, I'll fill you in...
Firstly, what I actually want to solve is the following problem:
A plain text that originates from a database gets inserted somewhere in a Story. After that, two types of changes to the text may occur: The designer may update the placed text (layout changes, formatting, but also actual text changes), or the original plain text may get updated in the database.
So, I want to allow the designer to compare the placed text with the current database value, and to be able to manually "merge" changes without loosing layout changes, formatting, white-spaces, etc.
The solution I have implemented (based on Jongware's proposal) is as follows:
1) The main script function is called with an inDesign text range (the placed text version) and a string (the DB text version).
2) The entire inDesign text range is highlighted with a yellow condtion, signalling that it is now in diff mode.
3) All diffs added locally (or removed from the db value) gets highlighted with a green condition.
4) All diffs removed locally (or added to the db value) gets highlighted with a red condition.
5) Whenever the designer right-clicks somewhere in the inDesign text range (yellow condition), two menu-items are added to the popup-menu:
5.1) "End diff mode": Will remove the yellow and green condition mark-up and purge text marked with red condition.
5.2) "Revert diffs": Will remove the yellow and red condition mark-up and purge text marked with green condition.
In between starting the diff mode and ending it using one of the two menu calls, the designer can update the marked-up text, and e.g preserve a red change by removing the red condition.
Overall, the solutions seems to work fine (being still at the development stage). I have a few reservations, though:
1) To use the diff alogrithm, I pretty much rely on Text.words being analogous to Text.contents.split(/\s+/). I'm not sure that this is a universal truth.
2) I'm not overly impressed with the speed of some of the operations (e.g. removing conditions from a text range). But alas, that may have more to do with me being pretty new to inDesign scripting...
3) The script needs to run in the "session" target engine, because I update the text popup menu. It seems to be the case that you then have to run the script from within inDesign rather than from the ExtendScript Toolkit. (Anyone?)
Anyway, if you are interested in the gory details, I can post the test script.
Best regards,
- Peder

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