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From "Peter Kelly (JIRA)" <>
Subject [jira] [Commented] (COR-11) Make interface between docformat and webkit (prepare for e.g. Qt).
Date Tue, 10 Feb 2015 18:57:12 GMT


Peter Kelly commented on COR-11:

The workflow you've described is pretty close. Here's the steps taken when editing a .docx
file in UX Write:

1. DocFormats converts d1.docx to d1.html
2. User edits the HTML file (in the JS editor), and saves to d2.html
3. DocFormats creates a new file d2.docx, based on the content of d1.docx and d2.html

Step 3 is really the hard part. Conceptually what it does is re-create d1.html, and recurse
through the DOM tree figuring out what has changed, and then translating those changes to
equivalent transformations to the .docx XML files.

In practice it isn't so clean; the change detection and application of those translations
in a docx-specific manner are intertwined extremely closely right now. The ODF filter, if
implemented according to the same technique, would have to repeat the same work. Additionally,
change detection depends heavily on the presence of id attributes in the d1.html and d2.html
to infer "alignment" - that is, which elements correspond to each other in the two files.

What I'd embarked on a few weeks ago was an attempt to separate the change detection out of
the docx filter, so that we could have a "list of changes" data structure (basically a diff).
Each filter would then take the list of changes as a parameter, rahter than an update a document.
So then the instructions it would get would be things like "delete paragraph 4", and "make
the third word of the last paragraph bold". Once presented with these changes, a given filter
would work out how to do those things in a suitable manner for the file format in question.

The change detection problem however is quite tricky. This is kind of getting off-topic for
this thread so I'll write more about this separately shortly.

> Make interface between docformat and webkit (prepare for e.g. Qt).
> ------------------------------------------------------------------
>                 Key: COR-11
>                 URL:
>             Project: Corinthia
>          Issue Type: New Feature
>          Components: DocFormats - API
>         Environment: source
>            Reporter: jan iversen
>            Priority: Blocker
>             Fix For: 0.5
> We need a API to the library

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