Here is what I ended up using, thanks to "A.J.Mechelynck" and "A.
S. Budden" on the Vim list and Doug Kearns (what he called "a bit of
a '2 AM solution'" -- and it works fine!) on the Vim-Ruby list. The
first function highlights the %Q{....} quotes in Ruby as C code, the
second does it for here documents of the form
<<-CSTRING
...
CSTRING
Here they are:
" To MetaProgram C using Ruby
function RubyMetaC1()
:unlet! b:current_syntax
:syntax include @CSTUFF ~/.vimrc_include_c_syn
:syntax region rubyC1 matchgroup=String start=+%Q{+ end=+}+ keepend [EMAIL
PROTECTED]
:syntax region rubyC2 matchgroup=String start=+%Q(+ end=+)+ keepend [EMAIL
PROTECTED]
:syntax region rubyC3 matchgroup=String start=+%Q<+ end=+>+ keepend [EMAIL
PROTECTED]
" :syntax on
endfunction
function RubyMetaC2()
unlet b:current_syntax
syn include @cTop syntax/c.vim
let b:current_syntax = "ruby"
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<CSTRING\ze+hs=s+2
matchgroup=rubyStringDelimiter end=+^CSTRING$+
contains=rubyHeredocStart,@rubyStringSpecial,@cTop fold keepend
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<"CSTRING"\ze+hs=s+2
matchgroup=rubyStringDelimiter end=+^CSTRING$+
contains=rubyHeredocStart,@rubyStringSpecial,@cTop fold keepend
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<'CSTRING'\ze+hs=s+2
matchgroup=rubyStringDelimiter end=+^CSTRING$+ contains=rubyHeredocStart,@cTop
fold keepend
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<`CSTRING`\ze+hs=s+2
matchgroup=rubyStringDelimiter end=+^CSTRING$+
contains=rubyHeredocStart,@rubyStringSpecial,@cTop fold keepend
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<-CSTRING\ze+hs=s+3
matchgroup=rubyStringDelimiter end=+^\s*\zsCSTRING$+
contains=rubyHeredocStart,@rubyStringSpecial,@cTop fold keepend
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<-"CSTRING"\ze+hs=s+3
matchgroup=rubyStringDelimiter end=+^\s*\zsCSTRING$+
contains=rubyHeredocStart,@rubyStringSpecial,@cTop fold keepend
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<-'CSTRING'\ze+hs=s+3
matchgroup=rubyStringDelimiter end=+^\s*\zsCSTRING$+
contains=rubyHeredocStart,@cTop fold keepend
syn region rubyCString
start=+\%(\%(class\s*\|\%(\.\|::\)\)\_s*\)\@<!<<-`CSTRING`\ze+hs=s+3
matchgroup=rubyStringDelimiter end=+^\s*\zsCSTRING$+
contains=rubyHeredocStart,@rubyStringSpecial,@cTop fold keepend
syn cluster cCommentGroup contains=cTodo,rubyInterpolation
endfunction
and ~/.vimrc_include_c_syn is just:
runtime! syntax/c.vim
These seem to do much the same thing, i.e, they seem to handle C
equally well, so I may be able to recombine them, but it works for
me at the moment so I am content. And there may be subtleties in
behaviour I have so far not encountered.
I have them as functions so I can :call them as needed.
I suspect the first may be easy to parameterize for other languages,
but for now I'll leave that for those who enjoy exploring such matters.
Thank you all again, this was way above my present skill level.
Hugh
