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isStandardSyntaxDeclaration.js
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isStandardSyntaxDeclaration.js
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/* @flow */
"use strict";
function isStandardSyntaxLang(lang) {
return (
lang &&
(lang === "css" ||
lang === "custom-template" ||
lang === "template-literal")
);
}
/**
* Check whether a declaration is standard
*/
module.exports = function(decl /*: Object*/) /*: boolean*/ {
const prop = decl.prop;
const parent = decl.parent;
// Declarations belong in a declaration block or standard CSS source
if (parent.type === "root" && !isStandardSyntaxLang(parent.source.lang)) {
return false;
}
// Sass var (e.g. $var: x), nested list (e.g. $list: (x)) or nested map (e.g. $map: (key:value))
if (prop[0] === "$") {
return false;
}
// Less var (e.g. @var: x), but exclude variable interpolation (e.g. @{var})
if (prop[0] === "@" && prop[1] !== "{") {
return false;
}
// Sass nested properties (e.g. border: { style: solid; color: red; })
if (
parent.selector &&
parent.selector[parent.selector.length - 1] === ":" &&
parent.selector.substring(0, 2) !== "--"
) {
return false;
}
// Less &:extend
if (decl.extend) {
return false;
}
return true;
};