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69 lines
2.8 KiB
VimL
69 lines
2.8 KiB
VimL
" Vim syntax file
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" Language: CWEB
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" Maintainer: Andreas Scherer <andreas.scherer@pobox.com>
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" Last Change: 2011 Dec 25 by Thilo Six
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" Details of the CWEB language can be found in the article by Donald E. Knuth
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" and Silvio Levy, "The CWEB System of Structured Documentation", included as
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" file "cwebman.tex" in the standard CWEB distribution, available for
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" anonymous ftp at ftp://labrea.stanford.edu/pub/cweb/.
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" TODO: Section names and C/C++ comments should be treated as TeX material.
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" TODO: The current version switches syntax highlighting off for section
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" TODO: names, and leaves C/C++ comments as such. (On the other hand,
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" TODO: switching to TeX mode in C/C++ comments might be colour overkill.)
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" quit when a syntax file was already loaded
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if exists("b:current_syntax")
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finish
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endif
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" For starters, read the TeX syntax; TeX syntax items are allowed at the top
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" level in the CWEB syntax, e.g., in the preamble. In general, a CWEB source
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" code can be seen as a normal TeX document with some C/C++ material
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" interspersed in certain defined regions.
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runtime! syntax/tex.vim
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unlet b:current_syntax
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" Read the C/C++ syntax too; C/C++ syntax items are treated as such in the
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" C/C++ section of a CWEB chunk or in inner C/C++ context in "|...|" groups.
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syntax include @webIncludedC <sfile>:p:h/cpp.vim
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let s:cpo_save = &cpo
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set cpo&vim
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" Inner C/C++ context (ICC) should be quite simple as it's comprised of
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" material in "|...|"; however the naive definition for this region would
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" hickup at the innocious "\|" TeX macro. Note: For the time being we expect
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" that an ICC begins either at the start of a line or after some white space.
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syntax region webInnerCcontext start="\(^\|[ \t\~`(]\)|" end="|" contains=@webIncludedC,webSectionName,webRestrictedTeX,webIgnoredStuff
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" Genuine C/C++ material. This syntactic region covers both the definition
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" part and the C/C++ part of a CWEB section; it is ended by the TeX part of
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" the next section.
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syntax region webCpart start="@[dfscp<(]" end="@[ \*]" contains=@webIncludedC,webSectionName,webRestrictedTeX,webIgnoredStuff
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" Section names contain C/C++ material only in inner context.
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syntax region webSectionName start="@[<(]" end="@>" contains=webInnerCcontext contained
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" The contents of "control texts" is not treated as TeX material, because in
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" non-trivial cases this completely clobbers the syntax recognition. Instead,
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" we highlight these elements as "strings".
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syntax region webRestrictedTeX start="@[\^\.:t=q]" end="@>" oneline
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" Double-@ means single-@, anywhere in the CWEB source. (This allows e-mail
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" address <someone@@fsf.org> without going into C/C++ mode.)
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syntax match webIgnoredStuff "@@"
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" Define the default highlighting.
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" Only when an item doesn't have highlighting yet
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hi def link webRestrictedTeX String
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let b:current_syntax = "cweb"
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let &cpo = s:cpo_save
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unlet s:cpo_save
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" vim: ts=8
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