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1 " Vim syntax file
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2 " Language: CWEB
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3 " Maintainer: Andreas Scherer <andreas.scherer@pobox.com>
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4 " Last Change: 2011 Dec 25 by Thilo Six
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5
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6 " Details of the CWEB language can be found in the article by Donald E. Knuth
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7 " and Silvio Levy, "The CWEB System of Structured Documentation", included as
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8 " file "cwebman.tex" in the standard CWEB distribution, available for
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9 " anonymous ftp at ftp://labrea.stanford.edu/pub/cweb/.
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10
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11 " TODO: Section names and C/C++ comments should be treated as TeX material.
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12 " TODO: The current version switches syntax highlighting off for section
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13 " TODO: names, and leaves C/C++ comments as such. (On the other hand,
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14 " TODO: switching to TeX mode in C/C++ comments might be colour overkill.)
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15
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16 " For version 5.x: Clear all syntax items
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17 " For version 6.x: Quit when a syntax file was already loaded
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18 if version < 600
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19 syntax clear
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20 elseif exists("b:current_syntax")
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21 finish
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22 endif
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23
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24 " For starters, read the TeX syntax; TeX syntax items are allowed at the top
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25 " level in the CWEB syntax, e.g., in the preamble. In general, a CWEB source
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26 " code can be seen as a normal TeX document with some C/C++ material
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27 " interspersed in certain defined regions.
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28 if version < 600
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29 source <sfile>:p:h/tex.vim
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30 else
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31 runtime! syntax/tex.vim
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32 unlet b:current_syntax
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33 endif
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34
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35 " Read the C/C++ syntax too; C/C++ syntax items are treated as such in the
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36 " C/C++ section of a CWEB chunk or in inner C/C++ context in "|...|" groups.
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37 syntax include @webIncludedC <sfile>:p:h/cpp.vim
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38
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39 let s:cpo_save = &cpo
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40 set cpo&vim
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41
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42 " Inner C/C++ context (ICC) should be quite simple as it's comprised of
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43 " material in "|...|"; however the naive definition for this region would
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44 " hickup at the innocious "\|" TeX macro. Note: For the time being we expect
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45 " that an ICC begins either at the start of a line or after some white space.
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46 syntax region webInnerCcontext start="\(^\|[ \t\~`(]\)|" end="|" contains=@webIncludedC,webSectionName,webRestrictedTeX,webIgnoredStuff
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47
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48 " Genuine C/C++ material. This syntactic region covers both the definition
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49 " part and the C/C++ part of a CWEB section; it is ended by the TeX part of
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50 " the next section.
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51 syntax region webCpart start="@[dfscp<(]" end="@[ \*]" contains=@webIncludedC,webSectionName,webRestrictedTeX,webIgnoredStuff
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52
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53 " Section names contain C/C++ material only in inner context.
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54 syntax region webSectionName start="@[<(]" end="@>" contains=webInnerCcontext contained
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55
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56 " The contents of "control texts" is not treated as TeX material, because in
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57 " non-trivial cases this completely clobbers the syntax recognition. Instead,
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58 " we highlight these elements as "strings".
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59 syntax region webRestrictedTeX start="@[\^\.:t=q]" end="@>" oneline
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60
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61 " Double-@ means single-@, anywhere in the CWEB source. (This allows e-mail
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62 " address <someone@@fsf.org> without going into C/C++ mode.)
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63 syntax match webIgnoredStuff "@@"
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64
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65 " Define the default highlighting.
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66 " For version 5.7 and earlier: only when not done already
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67 " For version 5.8 and later: only when an item doesn't have highlighting yet
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68 if version >= 508 || !exists("did_cweb_syntax_inits")
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69 if version < 508
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70 let did_cweb_syntax_inits = 1
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71 command -nargs=+ HiLink hi link <args>
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72 else
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73 command -nargs=+ HiLink hi def link <args>
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74 endif
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75
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76 HiLink webRestrictedTeX String
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77
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78 delcommand HiLink
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79 endif
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80
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81 let b:current_syntax = "cweb"
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82
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83 let &cpo = s:cpo_save
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84 unlet s:cpo_save
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85 " vim: ts=8
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