Re: [Beaver-devel] Syntax Highlighting

[Michael Terry]

Leslie Polzer wrote:
> Hello Michael,
>
> can you please explain the actions you take to refresh syhi on a change
> to me?

Ok.  So, let's take an insert.  Deletions are not very different.

First, I find the two boundary GtkTextIter's.  Then, I 'expand' them to 
push them out to whatever is interesting.  For example, if the text is 
going from "ifthen" to "if hello then", i want to be able to catch the 
if and the then.  So, I have a record of every ascii character's keyword 
status -- whether it appears in a keyword, whether it starts a keyword, 
or whether it ends a keyword.  I go backward from start iter to find 
first character that isn't in a keyword or the first delimiter.  The 
same for end iter, except I always go at least one forward, I think.

Then, I run the syhi engine on the text between the expanded iters. 
First, this removes any highlighting on the section.  Then, it basically 
examines each character in turn and deletes any syhi GtkTextMarks it 
finds.  If the character starts a 'special string' like a string or char 
marker, a line comment starter, or a block comment start or end, it 
creates a GtkTextMark and adds it to a list for the buffer.  If it finds 
a keyword, it colors it.

At the end, if it deleted or created any GtkTextMark's, it will refresh 
the 'special string' colors.  So, it will run through our list of 
GtkTextMark's and color each apropriately.  i.e., if it sees a Mark that 
represents a block comment start, it will continue scanning through the 
list for a block comment end and when it sees one, will stop and color 
all intermediate text.

That's the basic idea.  Want any more info?

-mt

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