doc_colour.pl -- Source colouring support

Provide hierarchical colouring information on top of the library(prolog_colour). We need ordered hierarchical information to create HTML fragments.

 colour_fragments(+In, -Fragments:list) is det

Create a list of colour fragments from In.

Arguments:

Fragments

- List of fragment(Start, End, Class, Subs)

 include_fullstops(+FragmentsIn, -FragmentsOut) is det[private]

Include fullstops into the term that preceeds them.

 fragment_hierarchy(+Fragments, -Hierarchy) is det[private]

Translate list of fragment(Start, End, Class) into fragment(Start, End, Class, SubFragments).

To be done

- Detect improper nesting. How to handle?