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/*
Language: Less
Description: It's CSS, with just a little more.
Author: Max Mikhailov <seven.phases.max@gmail.com>
Website: http://lesscss.org
Category: common, css
*/
function less(hljs) {
var IDENT_RE = '[\\w-]+'; // yes, Less identifiers may begin with a digit
var INTERP_IDENT_RE = '(' + IDENT_RE + '|@\\{' + IDENT_RE + '\\})';
/* Generic Modes */
var RULES = [], VALUE = []; // forward def. for recursive modes
var STRING_MODE = function(c) { return {
// Less strings are not multiline (also include '~' for more consistent coloring of "escaped" strings)
className: 'string', begin: '~?' + c + '.*?' + c
};};
var IDENT_MODE = function(name, begin, relevance) { return {
className: name, begin: begin, relevance: relevance
};};
var PARENS_MODE = {
// used only to properly balance nested parens inside mixin call, def. arg list
begin: '\\(', end: '\\)', contains: VALUE, relevance: 0
};
// generic Less highlighter (used almost everywhere except selectors):
VALUE.push(
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE,
STRING_MODE("'"),
STRING_MODE('"'),
hljs.CSS_NUMBER_MODE, // fixme: it does not include dot for numbers like .5em :(
{
begin: '(url|data-uri)\\(',
starts: {className: 'string', end: '[\\)\\n]', excludeEnd: true}
},
IDENT_MODE('number', '#[0-9A-Fa-f]+\\b'),
PARENS_MODE,
IDENT_MODE('variable', '@@?' + IDENT_RE, 10),
IDENT_MODE('variable', '@\\{' + IDENT_RE + '\\}'),
IDENT_MODE('built_in', '~?`[^`]*?`'), // inline javascript (or whatever host language) *multiline* string
{ // @media features (it’s here to not duplicate things in AT_RULE_MODE with extra PARENS_MODE overriding):
className: 'attribute', begin: IDENT_RE + '\\s*:', end: ':', returnBegin: true, excludeEnd: true
},
{
className: 'meta',
begin: '!important'
}
);
var VALUE_WITH_RULESETS = VALUE.concat({
begin: /\{/, end: /\}/, contains: RULES
});
var MIXIN_GUARD_MODE = {
beginKeywords: 'when', endsWithParent: true,
contains: [{beginKeywords: 'and not'}].concat(VALUE) // using this form to override VALUE’s 'function' match
};
/* Rule-Level Modes */
var RULE_MODE = {
begin: INTERP_IDENT_RE + '\\s*:', returnBegin: true, end: '[;}]',
relevance: 0,
contains: [
{
className: 'attribute',
begin: INTERP_IDENT_RE, end: ':', excludeEnd: true,
starts: {
endsWithParent: true, illegal: '[<=$]',
relevance: 0,
contains: VALUE
}
}
]
};
var AT_RULE_MODE = {
className: 'keyword',
begin: '@(import|media|charset|font-face|(-[a-z]+-)?keyframes|supports|document|namespace|page|viewport|host)\\b',
starts: {end: '[;{}]', returnEnd: true, contains: VALUE, relevance: 0}
};
// variable definitions and calls
var VAR_RULE_MODE = {
className: 'variable',
variants: [
// using more strict pattern for higher relevance to increase chances of Less detection.
// this is *the only* Less specific statement used in most of the sources, so...
// (we’ll still often loose to the css-parser unless there's '//' comment,
// simply because 1 variable just can't beat 99 properties :)
{begin: '@' + IDENT_RE + '\\s*:', relevance: 15},
{begin: '@' + IDENT_RE}
],
starts: {end: '[;}]', returnEnd: true, contains: VALUE_WITH_RULESETS}
};
var SELECTOR_MODE = {
// first parse unambiguous selectors (i.e. those not starting with tag)
// then fall into the scary lookahead-discriminator variant.
// this mode also handles mixin definitions and calls
variants: [{
begin: '[\\.#:&\\[>]', end: '[;{}]' // mixin calls end with ';'
}, {
begin: INTERP_IDENT_RE, end: /\{/
}],
returnBegin: true,
returnEnd: true,
illegal: '[<=\'$"]',
relevance: 0,
contains: [
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE,
MIXIN_GUARD_MODE,
IDENT_MODE('keyword', 'all\\b'),
IDENT_MODE('variable', '@\\{' + IDENT_RE + '\\}'), // otherwise it’s identified as tag
IDENT_MODE('selector-tag', INTERP_IDENT_RE + '%?', 0), // '%' for more consistent coloring of @keyframes "tags"
IDENT_MODE('selector-id', '#' + INTERP_IDENT_RE),
IDENT_MODE('selector-class', '\\.' + INTERP_IDENT_RE, 0),
IDENT_MODE('selector-tag', '&', 0),
{className: 'selector-attr', begin: '\\[', end: '\\]'},
{className: 'selector-pseudo', begin: /:(:)?[a-zA-Z0-9_\-+()"'.]+/},
{begin: '\\(', end: '\\)', contains: VALUE_WITH_RULESETS}, // argument list of parametric mixins
{begin: '!important'} // eat !important after mixin call or it will be colored as tag
]
};
RULES.push(
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE,
AT_RULE_MODE,
VAR_RULE_MODE,
RULE_MODE,
SELECTOR_MODE
);
return {
name: 'Less',
case_insensitive: true,
illegal: '[=>\'/<($"]',
contains: RULES
};
}
module.exports = less;