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- " Vim syntax file
- " Language: CWEB
- " Maintainer: Andreas Scherer <andreas.scherer@pobox.com>
- " Last Change: April 30, 2001
-
- " Details of the CWEB language can be found in the article by Donald E. Knuth
- " and Silvio Levy, "The CWEB System of Structured Documentation", included as
- " file "cwebman.tex" in the standard CWEB distribution, available for
- " anonymous ftp at ftp://labrea.stanford.edu/pub/cweb/.
-
- " TODO: Section names and C/C++ comments should be treated as TeX material.
- " TODO: The current version switches syntax highlighting off for section
- " TODO: names, and leaves C/C++ comments as such. (On the other hand,
- " TODO: switching to TeX mode in C/C++ comments might be colour overkill.)
-
- " For version 5.x: Clear all syntax items
- " For version 6.x: Quit when a syntax file was already loaded
- if version < 600
- syntax clear
- elseif exists("b:current_syntax")
- finish
- endif
-
- " For starters, read the TeX syntax; TeX syntax items are allowed at the top
- " level in the CWEB syntax, e.g., in the preamble. In general, a CWEB source
- " code can be seen as a normal TeX document with some C/C++ material
- " interspersed in certain defined regions.
- if version < 600
- source <sfile>:p:h/tex.vim
- else
- runtime! syntax/tex.vim
- unlet b:current_syntax
- endif
-
- " Read the C/C++ syntax too; C/C++ syntax items are treated as such in the
- " C/C++ section of a CWEB chunk or in inner C/C++ context in "|...|" groups.
- syntax include @webIncludedC <sfile>:p:h/cpp.vim
-
- " Inner C/C++ context (ICC) should be quite simple as it's comprised of
- " material in "|...|"; however the naive definition for this region would
- " hickup at the innocious "\|" TeX macro. Note: For the time being we expect
- " that an ICC begins either at the start of a line or after some white space.
- syntax region webInnerCcontext start="\(^\|[ \t\~`(]\)|" end="|" contains=@webIncludedC,webSectionName,webRestrictedTeX,webIgnoredStuff
-
- " Genuine C/C++ material. This syntactic region covers both the definition
- " part and the C/C++ part of a CWEB section; it is ended by the TeX part of
- " the next section.
- syntax region webCpart start="@[dfscp<(]" end="@[ \*]" contains=@webIncludedC,webSectionName,webRestrictedTeX,webIgnoredStuff
-
- " Section names contain C/C++ material only in inner context.
- syntax region webSectionName start="@[<(]" end="@>" contains=webInnerCcontext contained
-
- " The contents of "control texts" is not treated as TeX material, because in
- " non-trivial cases this completely clobbers the syntax recognition. Instead,
- " we highlight these elements as "strings".
- syntax region webRestrictedTeX start="@[\^\.:t=q]" end="@>" oneline
-
- " Double-@ means single-@, anywhere in the CWEB source. (This allows e-mail
- " address <someone@@fsf.org> without going into C/C++ mode.)
- syntax match webIgnoredStuff "@@"
-
- " Define the default highlighting.
- " For version 5.7 and earlier: only when not done already
- " For version 5.8 and later: only when an item doesn't have highlighting yet
- if version >= 508 || !exists("did_cweb_syntax_inits")
- if version < 508
- let did_cweb_syntax_inits = 1
- command -nargs=+ HiLink hi link <args>
- else
- command -nargs=+ HiLink hi def link <args>
- endif
-
- HiLink webRestrictedTeX String
-
- delcommand HiLink
- endif
-
- let b:current_syntax = "cweb"
-
- " vim: ts=8
-