commit (HEAD): document iterators

From: Tomas Frydrych (tomasfrydrych_at_yahoo.co.uk)
Date: Mon Nov 10 2003 - 15:39:37 EST

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    This is the gist:

        class UT_TextIterator: pure abstract class that defines generic
        iterator API so that we can pass references to iterators in and out
        of all kinds of functions

        derived classes
        PD_DocIterator
        PD_StruxIterator
        two slightly different iterators over the text of a document; the
        former can iterate over the entire document, the latter iterates from
        a given strux forward. They use slightly different mechanisms for
        moving around, making them suited to different things;
        PD_StruxIterator is functionally equivalent to the getSpanPtr()
        mechanism.

    I have now replaced first batch of getSpanPtr() calls in fp_TextRun
    with PD_StruxIterator, hope to do the remainder later this week.

    files: ut_TextIterator.h, pd_Iterator.h/cpp, fp_TextRun.h/cpp, ptbl
    makefiles

    Tomas

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