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-rw-r--r--runtime/syntax/less.vim78
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diff --git a/runtime/syntax/less.vim b/runtime/syntax/less.vim
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+++ b/runtime/syntax/less.vim
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+" 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: