postcss-export-custom-variables
Version:
Export custom media queries, custom properties, custom property sets, and custom selectors from CSS as JavaScript variables
150 lines (116 loc) • 18.4 kB
JavaScript
;
var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
// native tooling
var fs = require('fs');
// external tooling
var postcss = require('postcss');
// custom variable matches
var customPropertyMatch = /^--([_a-zA-Z]+[_a-zA-Z0-9-]*)$/;
var customPropertySetMatch = /^--([_a-zA-Z]+[_a-zA-Z0-9-]*):$/;
var customMediaQueryMatch = /^--([_a-zA-Z]+[_a-zA-Z0-9-]*)\s+(.+)$/;
var customSelectorMatch = /^:--([_a-zA-Z]+[_a-zA-Z0-9-]*)\s+(.+)$/;
// plugin
module.exports = postcss.plugin('postcss-export-custom-variables', function () {
var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
var _options$customMediaQ = options.customMediaQueryAssigner,
customMediaQueryAssigner = _options$customMediaQ === undefined ? defaultAssigner : _options$customMediaQ,
_options$customProper = options.customPropertyAssigner,
customPropertyAssigner = _options$customProper === undefined ? defaultAssigner : _options$customProper,
_options$customProper2 = options.customPropertySetAssigner,
customPropertySetAssigner = _options$customProper2 === undefined ? defaultPropertySetAssigner : _options$customProper2,
_options$customSelect = options.customSelectorAssigner,
customSelectorAssigner = _options$customSelect === undefined ? defaultAssigner : _options$customSelect,
_options$exporter = options.exporter,
exporter = _options$exporter === undefined ? defaultJsExporter : _options$exporter,
_options$variables = options.variables,
variables = _options$variables === undefined ? {} : _options$variables;
return function (root) {
root.walk(function (node) {
if (isCustomMediaQuery(node)) {
var _node$params$match = node.params.match(customMediaQueryMatch),
_node$params$match2 = _slicedToArray(_node$params$match, 3),
name = _node$params$match2[1],
queries = _node$params$match2[2];
Object.assign(variables, customMediaQueryAssigner(name, queries, node));
} else if (isCustomProperty(node)) {
var _node$prop$match = node.prop.match(customPropertyMatch),
_node$prop$match2 = _slicedToArray(_node$prop$match, 2),
property = _node$prop$match2[1];
Object.assign(variables, customPropertyAssigner(property, node.value, node));
} else if (isCustomPropertySet(node)) {
var _node$selector$match = node.selector.match(customPropertySetMatch),
_node$selector$match2 = _slicedToArray(_node$selector$match, 2),
_property = _node$selector$match2[1];
Object.assign(variables, customPropertySetAssigner(_property, node.nodes, node));
} else if (isCustomSelector(node)) {
var _node$params$match3 = node.params.match(customSelectorMatch),
_node$params$match4 = _slicedToArray(_node$params$match3, 3),
_property2 = _node$params$match4[1],
selectors = _node$params$match4[2];
Object.assign(variables, customSelectorAssigner(_property2, selectors, node));
}
});
return exporter === 'js' ? defaultJsExporter(variables, options, root) : exporter === 'json' ? defaultJsonExporter(variables, options, root) : exporter(variables, options, root);
};
});
// Extensions for default Assigners and default exports
module.exports.defaultAssigner = defaultAssigner;
module.exports.defaultPropertySetAssigner = defaultPropertySetAssigner;
module.exports.defaultJsExporter = defaultJsExporter;
module.exports.defaultJsonExporter = defaultJsonExporter;
// Variable detection functions
function isCustomMediaQuery(node) {
return node.type === 'atrule' && node.name === 'custom-media' && customMediaQueryMatch.test(node.params);
}
function isCustomProperty(node) {
return node.type === 'decl' && customPropertyMatch.test(node.prop);
}
function isCustomPropertySet(node) {
return node.type === 'rule' && customPropertySetMatch.test(node.selector);
}
function isCustomSelector(node) {
return node.type === 'atrule' && node.name === 'custom-selector' && customSelectorMatch.test(node.params);
}
// Default Assigner functions
function defaultAssigner(rawproperty, rawvalue) {
var property = rawproperty.replace(/-+(.|$)/g, function (_ref) {
var _ref2 = _slicedToArray(_ref, 2),
letter = _ref2[1];
return letter.toUpperCase();
});
return _defineProperty({}, property, rawvalue);
}
function defaultPropertySetAssigner(rawproperty, nodes) {
return defaultAssigner(rawproperty, Object.assign.apply(Object, _toConsumableArray(nodes.map(function (node) {
var property = node.prop.replace(/-+(.|$)/g, function (_ref4) {
var _ref5 = _slicedToArray(_ref4, 2),
letter = _ref5[1];
return letter.toUpperCase();
});
return _defineProperty({}, property, node.value);
}))));
}
// Default export functions
function defaultJsExporter(variables, options, root) {
var pathname = options.destination || root.source && root.source.input && root.source.input.file && root.source.input.file + '.js' || 'custom-variables.js';
var contents = Object.keys(variables).reduce(function (buffer, key) {
return buffer + 'export const ' + key + ' = ' + JSON.stringify(variables[key]).replace(/(^|{|,)"(.+?)":/g, '$1$2:') + ';\n';
}, '');
return new Promise(function (resolve, reject) {
fs.writeFile(pathname, contents, function (error) {
return error ? reject(error) : resolve();
});
});
}
function defaultJsonExporter(variables, options, root) {
var pathname = options.destination || root.source && root.source.input && root.source.input.file && root.source.input.file + '.json' || 'custom-variables.json';
var contents = JSON.stringify(variables, null, ' ');
return new Promise(function (resolve, reject) {
fs.writeFile(pathname, contents, function (error) {
return error ? reject(error) : resolve();
});
});
}
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native tooling\nconst fs = require('fs');\n\n// external tooling\nconst postcss = require('postcss');\n\n// custom variable matches\nconst customPropertyMatch    = /^--([_a-zA-Z]+[_a-zA-Z0-9-]*)$/;\nconst customPropertySetMatch = /^--([_a-zA-Z]+[_a-zA-Z0-9-]*):$/;\nconst customMediaQueryMatch  = /^--([_a-zA-Z]+[_a-zA-Z0-9-]*)\\s+(.+)$/;\nconst customSelectorMatch    = /^:--([_a-zA-Z]+[_a-zA-Z0-9-]*)\\s+(.+)$/;\n\n// plugin\nmodule.exports = postcss.plugin('postcss-export-custom-variables', (options = {}) => {\n\tconst {\n\t\tcustomMediaQueryAssigner  = defaultAssigner,\n\t\tcustomPropertyAssigner    = defaultAssigner,\n\t\tcustomPropertySetAssigner = defaultPropertySetAssigner,\n\t\tcustomSelectorAssigner    = defaultAssigner,\n\t\texporter                  = defaultJsExporter,\n\t\tvariables                 = {}\n\t} = options;\n\n\treturn (root) => {\n\t\troot.walk(\n\t\t\t(node) => {\n\t\t\t\tif (isCustomMediaQuery(node)) {\n\t\t\t\t\tconst [ , name, queries ] = node.params.match(customMediaQueryMatch);\n\n\t\t\t\t\tObject.assign(variables, customMediaQueryAssigner(name, queries, node));\n\t\t\t\t} else if (isCustomProperty(node)) {\n\t\t\t\t\tconst [ , property ] = node.prop.match(customPropertyMatch);\n\n\t\t\t\t\tObject.assign(variables, customPropertyAssigner(property, node.value, node));\n\t\t\t\t} else if (isCustomPropertySet(node)) {\n\t\t\t\t\tconst [ , property ] = node.selector.match(customPropertySetMatch);\n\n\t\t\t\t\tObject.assign(variables, customPropertySetAssigner(property, node.nodes, node));\n\t\t\t\t} else if (isCustomSelector(node)) {\n\t\t\t\t\tconst [ , property, selectors ] = node.params.match(customSelectorMatch);\n\n\t\t\t\t\tObject.assign(variables, customSelectorAssigner(property, selectors, node));\n\t\t\t\t}\n\t\t\t}\n\t\t);\n\n\t\treturn exporter === 'js'\n\t\t\t? defaultJsExporter(variables, options, root)\n\t\t\t: exporter === 'json'\n\t\t\t\t? defaultJsonExporter(variables, options, root)\n\t\t\t\t: exporter(variables, options, root);\n\t};\n});\n\n// Extensions for default Assigners and default exports\n\nmodule.exports.defaultAssigner            = defaultAssigner;\nmodule.exports.defaultPropertySetAssigner = defaultPropertySetAssigner;\nmodule.exports.defaultJsExporter          = defaultJsExporter;\nmodule.exports.defaultJsonExporter        = defaultJsonExporter;\n\n// Variable detection functions\n\nfunction isCustomMediaQuery(node) {\n\treturn node.type === 'atrule' && node.name === 'custom-media' && customMediaQueryMatch.test(node.params);\n}\n\nfunction isCustomProperty(node) {\n\treturn node.type === 'decl'   && customPropertyMatch.test(node.prop);\n}\n\nfunction isCustomPropertySet(node) {\n\treturn node.type === 'rule'   && customPropertySetMatch.test(node.selector);\n}\n\nfunction isCustomSelector(node) {\n\treturn node.type === 'atrule' && node.name === 'custom-selector' && customSelectorMatch.test(node.params);\n}\n\n// Default Assigner functions\n\nfunction defaultAssigner(rawproperty, rawvalue) {\n\tconst property = rawproperty.replace(/-+(.|$)/g, ([ , letter]) => letter.toUpperCase());\n\n\treturn {\n\t\t[property]: rawvalue\n\t};\n}\n\nfunction defaultPropertySetAssigner(rawproperty, nodes) {\n\treturn defaultAssigner(\n\t\trawproperty,\n\t\tObject.assign(\n\t\t\t...nodes.map(\n\t\t\t\t(node) => {\n\t\t\t\t\tconst property = node.prop.replace(/-+(.|$)/g, ([ , letter]) => letter.toUpperCase());\n\n\t\t\t\t\treturn {\n\t\t\t\t\t\t[property]: node.value\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t)\n\t\t)\n\t);\n}\n\n// Default export functions\n\nfunction defaultJsExporter(variables, options, root) {\n\tconst pathname = options.destination || root.source && root.source.input && root.source.input.file && root.source.input.file + '.js' || 'custom-variables.js';\n\tconst contents = Object.keys(variables).reduce(\n\t\t(buffer, key) => `${ buffer }export const ${ key } = ${ JSON.stringify(variables[key]).replace(/(^|{|,)\"(.+?)\":/g, '$1$2:') };\\n`,\n\t\t''\n\t);\n\n\treturn new Promise((resolve, reject) => {\n\t\tfs.writeFile(\n\t\t\tpathname,\n\t\t\tcontents,\n\t\t\t(error) => error ? reject(error) : resolve()\n\t\t);\n\t});\n}\n\nfunction defaultJsonExporter(variables, options, root) {\n\tconst pathname = options.destination || root.source && root.source.input && root.source.input.file && root.source.input.file + '.json' || 'custom-variables.json';\n\tconst contents = JSON.stringify(variables, null, '  ');\n\n\treturn new Promise((resolve, reject) => {\n\t\tfs.writeFile(\n\t\t\tpathname,\n\t\t\tcontents,\n\t\t\t(error) => error ? reject(error) : resolve()\n\t\t);\n\t});\n}\n"]}