neovim/runtime/syntax/less.vim

" Vim syntax file
" Language:	less
" Maintainer:	Alessandro Vioni <jenoma@gmail.com>
" URL: https://github.com/genoma/vim-less
" Last Change:	2020 Sep 29

if exists("b:current_syntax")
  finish
endif

runtime! syntax/css.vim

syn case ignore

syn cluster lessCssProperties contains=cssFontProp,cssFontDescriptorProp,cssColorProp,cssTextProp,cssBoxProp,cssGeneratedContentProp,cssPagingProp,cssUIProp,cssRenderProp,cssAuralProp,cssTableProp
syn cluster lessCssAttributes contains=css.*Attr,lessEndOfLineComment,lessComment,cssValue.*,cssColor,cssURL,lessDefault,cssImportant,cssError,cssStringQ,cssStringQQ,cssFunction,cssUnicodeEscape,cssRenderProp

syn region lessDefinition matchgroup=cssBraces start="{" end="}" contains=TOP

syn match lessProperty "\%([{};]\s*\|^\)\@<=\%([[:alnum:]-]\|#{[^{}]*}\)\+\s*:" contains=css.*Prop skipwhite nextgroup=lessCssAttribute contained containedin=lessDefinition
syn match lessProperty "^\s*\zs\s\%(\%([[:alnum:]-]\|#{[^{}]*}\)\+\s*:\|:[[:alnum:]-]\+\)"hs=s+1 contains=css.*Prop skipwhite nextgroup=lessCssAttribute
syn match lessProperty "^\s*\zs\s\%(:\=[[:alnum:]-]\+\s*=\)"hs=s+1 contains=css.*Prop skipwhite nextgroup=lessCssAttribute
syn match lessCssAttribute +\%("\%([^"]\|\\"\)*"\|'\%([^']\|\\'\)*'\|#{[^{}]*}\|[^{};]\)*+ contained contains=@lessCssAttributes,lessVariable,lessFunction,lessInterpolation
syn match lessDefault "!default\>" contained

" less variables and media queries
syn match lessVariable "@[[:alnum:]_-]\+" nextgroup=lessCssAttribute skipwhite
syn match lessMedia "@media" nextgroup=lessCssAttribute skipwhite

" Less functions
syn match lessFunction "\<\%(escape\|e\|unit\)\>(\@=" contained
syn match lessFunction "\<\%(ceil\|floor\|percentage\|round\|sqrt\|abs\|sin\|asin\|cos\|acos\|tan\|atan\|pi\|pow\|min\|max\)\>(\@=" contained
syn match lessFunction "\<\%(rgb\|rgba\|argb\|argb\|hsl\|hsla\|hsv\|hsva\)\>(\@=" contained
syn match lessFunction "\<\%(hue\|saturation\|lightness\|red\|green\|blue\|alpha\|luma\)\>(\@=" contained
syn match lessFunction "\<\%(saturate\|desaturate\|lighten\|darken\|fadein\|fadeout\|fade\|spin\|mix\|greyscale\|contrast\)\>(\@=" contained
syn match lessFunction "\<\%(multiply\|screen\|overlay\|softlight\|hardlight\|difference\|exclusion\|average\|negation\)\>(\@=" contained

" Less id class visualization
syn match lessIdChar     "#[[:alnum:]_-]\@=" nextgroup=lessId,lessClassIdCall
syn match lessId         "[[:alnum:]_-]\+" contained
syn match lessClassIdCall  "[[:alnum:]_-]\+()" contained

syn match lessClassChar  "\.[[:alnum:]_-]\@=" nextgroup=lessClass,lessClassCall
syn match lessClass      "[[:alnum:]_-]\+" contained
syn match lessClassCall  "[[:alnum:]_-]\+()" contained

syn match lessAmpersand  "&" contains=lessIdChar,lessClassChar

syn region lessInclude start="@import" end=";\|$" contains=lessComment,cssURL,cssUnicodeEscape,cssMediaType,cssStringQ,cssStringQQ

syn keyword lessTodo        FIXME NOTE TODO OPTIMIZE XXX contained
syn region  lessComment     start="^\z(\s*\)//"  end="^\%(\z1 \)\@!" contains=lessTodo,@Spell
syn region  lessCssComment  start="^\z(\s*\)/\*" end="^\%(\z1 \)\@!" contains=lessTodo,@Spell
syn match   lessEndOfLineComment "//.*" contains=lessComment,lessTodo,@Spell

hi def link lessEndOfLineComment        lessComment
hi def link lessCssComment              lessComment
hi def link lessComment                 Comment
hi def link lessDefault                 cssImportant
hi def link lessVariable                Identifier
hi def link lessFunction                PreProc
hi def link lessTodo                    Todo
hi def link lessInclude                 Include
hi def link lessIdChar                  Special
hi def link lessClassChar               Special
hi def link lessAmpersand               Character
hi def link lessId                      Identifier
hi def link lessClass                   Type
hi def link lessCssAttribute            PreProc
hi def link lessClassCall               Type
hi def link lessClassIdCall             Type
hi def link lessTagName                 cssTagName
hi def link lessDeprecated              cssDeprecated
hi def link lessMedia                   cssMedia

let b:current_syntax = "less"

" vim:set sw=2: