IE11 css vars compatibility

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

4 files changed, 38 insertions, 0 deletions

diff --git a/core/vendor/.gitignore b/core/vendor/.gitignore
index 2c04d2e3177..a74b7f89a39 100644
--- a/core/vendor/.gitignore
+++ b/core/vendor/.gitignore
@@ -176,3 +176,10 @@ DOMPurify/**
 # strengthify
 strengthify/examples.html
 strengthify/examples.png
+
+# underscore
+css-vars-ponyfill/**
+!css-vars-ponyfill/dist
+!css-vars-ponyfill/dist/css-vars-ponyfill.min.js
+!css-vars-ponyfill/dist/css-vars-ponyfill.min.js.map
+!css-vars-ponyfill/LICENSE
\ No newline at end of file
diff --git a/core/vendor/css-vars-ponyfill/LICENSE b/core/vendor/css-vars-ponyfill/LICENSE
new file mode 100644
index 00000000000..51e689fe047
--- /dev/null
+++ b/core/vendor/css-vars-ponyfill/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 John Hildenbiddle
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/core/vendor/css-vars-ponyfill/dist/css-vars-ponyfill.min.js b/core/vendor/css-vars-ponyfill/dist/css-vars-ponyfill.min.js
new file mode 100644
index 00000000000..f68b2e18b81
--- /dev/null
+++ b/core/vendor/css-vars-ponyfill/dist/css-vars-ponyfill.min.js
@@ -0,0 +1,9 @@
+/*!
+ * css-vars-ponyfill
+ * v1.7.2
+ * https://github.com/jhildenbiddle/css-vars-ponyfill
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */
+!function(e,n){"object"==typeof exports&&"undefined"!=typeof module?module.exports=n():"function"==typeof define&&define.amd?define(n):e.cssVars=n()}(this,function(){"use strict";function e(e){var n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},r={mimeType:n.mimeType||null,onBeforeSend:n.onBeforeSend||Function.prototype,onSuccess:n.onSuccess||Function.prototype,onError:n.onError||Function.prototype,onComplete:n.onComplete||Function.prototype},t=Array.isArray(e)?e:[e],o=Array.apply(null,Array(t.length)).map(function(e){return null});function s(e,n){r.onError(e,t[n],n)}function a(e,n){var s=r.onSuccess(e,t[n],n);e=!1===s?"":s||e,o[n]=e,-1===o.indexOf(null)&&r.onComplete(o)}t.forEach(function(e,n){var t=document.createElement("a");t.setAttribute("href",e),t.href=t.href;var o=t.host!==location.host,i=t.protocol===location.protocol;if(o&&"undefined"!=typeof XDomainRequest)if(i){var u=new 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diff --git a/core/vendor/css-vars-ponyfill/dist/css-vars-ponyfill.min.js.map b/core/vendor/css-vars-ponyfill/dist/css-vars-ponyfill.min.js.map
new file mode 100644
index 00000000000..a14eaaf0ab7
--- /dev/null
+++ b/core/vendor/css-vars-ponyfill/dist/css-vars-ponyfill.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"css-vars-ponyfill.min.js","sources":["../node_modules/get-css-data/dist/get-css-data.esm.js","../src/merge-deep.js","../node_modules/balanced-match/index.js","../src/parse-css.js","../src/transform-css.js","../src/walk-css.js","../src/stringify-css.js","../src/index.js"],"sourcesContent":["/*!\n * get-css-data\n * v1.3.2\n * https://github.com/jhildenbiddle/get-css-data\n * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>\n * MIT license\n */\nfunction getUrls(urls) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n    var settings = {\n        mimeType: options.mimeType || null,\n        onBeforeSend: options.onBeforeSend || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onComplete: options.onComplete || Function.prototype\n    };\n    var urlArray = Array.isArray(urls) ? urls : [ urls ];\n    var urlQueue = Array.apply(null, Array(urlArray.length)).map(function(x) {\n        return null;\n    });\n    function onError(xhr, urlIndex) {\n        settings.onError(xhr, urlArray[urlIndex], urlIndex);\n    }\n    function onSuccess(responseText, urlIndex) {\n        var returnVal = settings.onSuccess(responseText, urlArray[urlIndex], urlIndex);\n        responseText = returnVal === false ? \"\" : returnVal || responseText;\n        urlQueue[urlIndex] = responseText;\n        if (urlQueue.indexOf(null) === -1) {\n            settings.onComplete(urlQueue);\n        }\n    }\n    urlArray.forEach(function(url, i) {\n        var parser = document.createElement(\"a\");\n        parser.setAttribute(\"href\", url);\n        parser.href = parser.href;\n        var isCrossDomain = parser.host !== location.host;\n        var isSameProtocol = parser.protocol === location.protocol;\n        if (isCrossDomain && typeof XDomainRequest !== \"undefined\") {\n            if (isSameProtocol) {\n                var xdr = new XDomainRequest();\n                xdr.open(\"GET\", url);\n                xdr.timeout = 0;\n                xdr.onprogress = Function.prototype;\n                xdr.ontimeout = Function.prototype;\n                xdr.onload = function() {\n                    onSuccess(xdr.responseText, i);\n                };\n                xdr.onerror = function(err) {\n                    onError(xdr, i);\n                };\n                setTimeout(function() {\n                    xdr.send();\n                }, 0);\n            } else {\n                console.log(\"Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol\");\n                onError(null, i);\n            }\n        } else {\n            var xhr = new XMLHttpRequest();\n            xhr.open(\"GET\", url);\n            if (settings.mimeType && xhr.overrideMimeType) {\n                xhr.overrideMimeType(settings.mimeType);\n            }\n            settings.onBeforeSend(xhr, url, i);\n            xhr.onreadystatechange = function() {\n                if (xhr.readyState === 4) {\n                    if (xhr.status === 200) {\n                        onSuccess(xhr.responseText, i);\n                    } else {\n                        onError(xhr, i);\n                    }\n                }\n            };\n            xhr.send();\n        }\n    });\n}\n\n/**\n * Gets CSS data from <style> and <link> nodes (including @imports), then\n * returns data in order processed by DOM. Allows specifying nodes to\n * include/exclude and filtering CSS data using RegEx.\n *\n * @preserve\n * @param {object}   [options] The options object\n * @param {string}   [options.include] CSS selector matching <link> and <style>\n *                   nodes to include\n * @param {string}   [options.exclude] CSS selector matching <link> and <style>\n *                   nodes to exclude\n * @param {object}   [options.filter] Regular expression used to filter node CSS\n *                   data. Each block of CSS data is tested against the filter,\n *                   and only matching data is included.\n * @param {function} [options.onBeforeSend] Callback before XHR is sent. Passes\n *                   1) the XHR object, 2) source node reference, and 3) the\n *                   source URL as arguments.\n * @param {function} [options.onSuccess] Callback on each CSS node read. Passes\n *                   1) CSS text, 2) source node reference, and 3) the source\n *                   URL as arguments.\n * @param {function} [options.onError] Callback on each error. Passes 1) the XHR\n *                   object for inspection, 2) soure node reference, and 3) the\n *                   source URL that failed (either a <link> href or an @import)\n *                   as arguments\n * @param {function} [options.onComplete] Callback after all nodes have been\n *                   processed. Passes 1) concatenated CSS text, 2) an array of\n *                   CSS text in DOM order, and 3) an array of nodes in DOM\n *                   order as arguments.\n *\n * @example\n *\n *   getCssData({\n *     include: 'style,link[rel=\"stylesheet\"]', // default\n *     exclude: '[href=\"skip.css\"]',\n *     filter : /red/,\n *     onBeforeSend(xhr, node, url) {\n *       // ...\n *     }\n *     onSuccess(cssText, node, url) {\n *       // ...\n *     }\n *     onError(xhr, node, url) {\n *       // ...\n *     },\n *     onComplete(cssText, cssArray) {\n *       // ...\n *     },\n *   });\n */ function getCssData(options) {\n    var regex = {\n        cssComments: /\\/\\*[\\s\\S]+?\\*\\//g,\n        cssImports: /(?:@import\\s*)(?:url\\(\\s*)?(?:['\"])([^'\"]*)(?:['\"])(?:\\s*\\))?(?:[^;]*;)/g\n    };\n    var settings = {\n        include: options.include || 'style,link[rel=\"stylesheet\"]',\n        exclude: options.exclude || null,\n        filter: options.filter || null,\n        onBeforeSend: options.onBeforeSend || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onComplete: options.onComplete || Function.prototype\n    };\n    var sourceNodes = Array.apply(null, document.querySelectorAll(settings.include)).filter(function(node) {\n        return !matchesSelector(node, settings.exclude);\n    });\n    var cssArray = Array.apply(null, Array(sourceNodes.length)).map(function(x) {\n        return null;\n    });\n    function handleComplete() {\n        var isComplete = cssArray.indexOf(null) === -1;\n        if (isComplete) {\n            var cssText = cssArray.join(\"\");\n            settings.onComplete(cssText, cssArray, sourceNodes);\n        }\n    }\n    function handleSuccess(cssText, cssIndex, node, sourceUrl) {\n        var returnVal = settings.onSuccess(cssText, node, sourceUrl);\n        cssText = returnVal === false ? \"\" : returnVal || cssText;\n        resolveImports(cssText, node, sourceUrl, function(resolvedCssText, errorData) {\n            if (cssArray[cssIndex] === null) {\n                errorData.forEach(function(data) {\n                    return settings.onError(data.xhr, node, data.url);\n                });\n                if (!settings.filter || settings.filter.test(resolvedCssText)) {\n                    cssArray[cssIndex] = resolvedCssText;\n                } else {\n                    cssArray[cssIndex] = \"\";\n                }\n                handleComplete();\n            }\n        });\n    }\n    function parseImportData(cssText, baseUrl) {\n        var ignoreRules = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : [];\n        var importData = {};\n        importData.rules = (cssText.replace(regex.cssComments, \"\").match(regex.cssImports) || []).filter(function(rule) {\n            return ignoreRules.indexOf(rule) === -1;\n        });\n        importData.urls = importData.rules.map(function(rule) {\n            return rule.replace(regex.cssImports, \"$1\");\n        });\n        importData.absoluteUrls = importData.urls.map(function(url) {\n            return getFullUrl(url, baseUrl);\n        });\n        importData.absoluteRules = importData.rules.map(function(rule, i) {\n            var oldUrl = importData.urls[i];\n            var newUrl = getFullUrl(importData.absoluteUrls[i], baseUrl);\n            return rule.replace(oldUrl, newUrl);\n        });\n        return importData;\n    }\n    function resolveImports(cssText, node, baseUrl, callbackFn) {\n        var __errorData = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : [];\n        var __errorRules = arguments.length > 5 && arguments[5] !== undefined ? arguments[5] : [];\n        var importData = parseImportData(cssText, baseUrl, __errorRules);\n        if (importData.rules.length) {\n            getUrls(importData.absoluteUrls, {\n                onBeforeSend: function onBeforeSend(xhr, url, urlIndex) {\n                    settings.onBeforeSend(xhr, node, url);\n                },\n                onSuccess: function onSuccess(cssText, url, urlIndex) {\n                    var returnVal = settings.onSuccess(cssText, node, url);\n                    cssText = returnVal === false ? \"\" : returnVal || cssText;\n                    var responseImportData = parseImportData(cssText, url, __errorRules);\n                    responseImportData.rules.forEach(function(rule, i) {\n                        cssText = cssText.replace(rule, responseImportData.absoluteRules[i]);\n                    });\n                    return cssText;\n                },\n                onError: function onError(xhr, url, urlIndex) {\n                    __errorData.push({\n                        xhr: xhr,\n                        url: url\n                    });\n                    __errorRules.push(importData.rules[urlIndex]);\n                    resolveImports(cssText, node, baseUrl, callbackFn, __errorData, __errorRules);\n                },\n                onComplete: function onComplete(responseArray) {\n                    responseArray.forEach(function(importText, i) {\n                        cssText = cssText.replace(importData.rules[i], importText);\n                    });\n                    resolveImports(cssText, node, baseUrl, callbackFn, __errorData, __errorRules);\n                }\n            });\n        } else {\n            callbackFn(cssText, __errorData);\n        }\n    }\n    if (sourceNodes.length) {\n        sourceNodes.forEach(function(node, i) {\n            var linkHref = node.getAttribute(\"href\");\n            var linkRel = node.getAttribute(\"rel\");\n            var isLink = node.nodeName === \"LINK\" && linkHref && linkRel && linkRel.toLowerCase() === \"stylesheet\";\n            var isStyle = node.nodeName === \"STYLE\";\n            if (isLink) {\n                getUrls(linkHref, {\n                    mimeType: \"text/css\",\n                    onBeforeSend: function onBeforeSend(xhr, url, urlIndex) {\n                        settings.onBeforeSend(xhr, node, url);\n                    },\n                    onSuccess: function onSuccess(cssText, url, urlIndex) {\n                        var sourceUrl = getFullUrl(linkHref, location.href);\n                        handleSuccess(cssText, i, node, sourceUrl);\n                    },\n                    onError: function onError(xhr, url, urlIndex) {\n                        cssArray[i] = \"\";\n                        settings.onError(xhr, node, url);\n                        handleComplete();\n                    }\n                });\n            } else if (isStyle) {\n                handleSuccess(node.textContent, i, node, location.href);\n            } else {\n                cssArray[i] = \"\";\n                handleComplete();\n            }\n        });\n    } else {\n        settings.onComplete(\"\", []);\n    }\n}\n\nfunction getFullUrl(url) {\n    var base = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : location.href;\n    var d = document.implementation.createHTMLDocument(\"\");\n    var b = d.createElement(\"base\");\n    var a = d.createElement(\"a\");\n    d.head.appendChild(b);\n    d.body.appendChild(a);\n    b.href = base;\n    a.href = url;\n    return a.href;\n}\n\nfunction matchesSelector(elm, selector) {\n    var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;\n    return matches.call(elm, selector);\n}\n\nexport default getCssData;\n//# sourceMappingURL=get-css-data.esm.js.map\n","// Functions\n// =============================================================================\n/**\n * Performs a deep merge of objects and returns new object. Does not modify\n * objects (immutable) and merges arrays via concatenation.\n *\n * @param {...object} objects - Objects to merge\n * @returns {object} New object with merged key/values\n */\nfunction mergeDeep(...objects) {\n    const isObject = obj => obj instanceof Object && obj.constructor === Object;\n\n    return objects.reduce((prev, obj) => {\n        Object.keys(obj).forEach(key => {\n            const pVal = prev[key];\n            const oVal = obj[key];\n\n            // if (Array.isArray(pVal) && Array.isArray(oVal)) {\n            //     prev[key] = pVal.concat(...oVal);\n            // }\n            if (isObject(pVal) && isObject(oVal)) {\n                prev[key] = mergeDeep(pVal, oVal);\n            }\n            else {\n                prev[key] = oVal;\n            }\n        });\n\n        return prev;\n    }, {});\n}\n\n\n// Export\n// =============================================================================\nexport default mergeDeep;\n","'use strict';\nmodule.exports = balanced;\nfunction balanced(a, b, str) {\n  if (a instanceof RegExp) a = maybeMatch(a, str);\n  if (b instanceof RegExp) b = maybeMatch(b, str);\n\n  var r = range(a, b, str);\n\n  return r && {\n    start: r[0],\n    end: r[1],\n    pre: str.slice(0, r[0]),\n    body: str.slice(r[0] + a.length, r[1]),\n    post: str.slice(r[1] + b.length)\n  };\n}\n\nfunction maybeMatch(reg, str) {\n  var m = str.match(reg);\n  return m ? m[0] : null;\n}\n\nbalanced.range = range;\nfunction range(a, b, str) {\n  var begs, beg, left, right, result;\n  var ai = str.indexOf(a);\n  var bi = str.indexOf(b, ai + 1);\n  var i = ai;\n\n  if (ai >= 0 && bi > 0) {\n    begs = [];\n    left = str.length;\n\n    while (i >= 0 && !result) {\n      if (i == ai) {\n        begs.push(i);\n        ai = str.indexOf(a, i + 1);\n      } else if (begs.length == 1) {\n        result = [ begs.pop(), bi ];\n      } else {\n        beg = begs.pop();\n        if (beg < left) {\n          left = beg;\n          right = bi;\n        }\n\n        bi = str.indexOf(b, i + 1);\n      }\n\n      i = ai < bi && ai >= 0 ? ai : bi;\n    }\n\n    if (begs.length) {\n      result = [ left, right ];\n    }\n  }\n\n  return result;\n}\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Parses CSS string and generates AST object\n *\n * @param {string} css The CSS stringt to be converted to an AST\n * @returns {object}\n */\nfunction cssParse(css) {\n    const errors = [];\n\n    // Errors\n    // -------------------------------------------------------------------------\n    function error(msg) {\n        throw new Error(`CSS parse error: ${msg}`);\n    }\n\n    // RegEx\n    // -------------------------------------------------------------------------\n    // Match regexp and return captures\n    function match(re) {\n        const m = re.exec(css);\n\n        if (m) {\n            css = css.slice(m[0].length);\n\n            return m;\n        }\n    }\n\n    function whitespace() {\n        match(/^\\s*/);\n    }\n    function open() {\n        return match(/^{\\s*/);\n    }\n    function close() {\n        return match(/^}/);\n    }\n\n    // Comments\n    // -------------------------------------------------------------------------\n    function comment() {\n        whitespace();\n\n        if (css[0] !== '/' || css[1] !== '*') { return; }\n\n        let i = 2;\n        while (css[i] && (css[i] !== '*' || css[i + 1] !== '/')) { i++; }\n\n        // FIXED\n        if (!css[i]) { return error('end of comment is missing'); }\n\n        const str = css.slice(2, i);\n        css = css.slice(i + 2);\n\n        return { type: 'comment', comment: str };\n    }\n    function comments() {\n        const cmnts = [];\n\n        let c;\n\n        while ((c = comment())) {\n            cmnts.push(c);\n        }\n        return cmnts;\n    }\n\n    // Selector\n    // -------------------------------------------------------------------------\n    function selector() {\n        whitespace();\n        while (css[0] === '}') {\n            error('extra closing bracket');\n        }\n\n        const m = match(/^((\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'|[^{])+)/);\n\n        if (m)\n        { return m[0]\n            .trim() // remove all comments from selectors\n            .replace(/\\/\\*([^*]|[\\r\\n]|(\\*+([^*/]|[\\r\\n])))*\\*\\/+/g, '')\n            .replace(/\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'/g, function(m) {\n                return m.replace(/,/g, '\\u200C');\n            })\n            .split(/\\s*(?![^(]*\\)),\\s*/)\n            .map(function(s) {\n                return s.replace(/\\u200C/g, ',');\n            }); }\n    }\n\n    // Declarations\n    // -------------------------------------------------------------------------\n    function declaration() {\n        match(/^([;\\s]*)+/); // ignore empty declarations + whitespace\n\n        const comment_regexp = /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//g;\n\n        let prop = match(/^(\\*?[-#/*\\\\\\w]+(\\[[0-9a-z_-]+\\])?)\\s*/);\n        if (!prop) { return; }\n\n        prop = prop[0].trim();\n\n        if (!match(/^:\\s*/)) { return error('property missing \\':\\''); }\n\n        // Quotes regex repeats verbatim inside and outside parentheses\n        const val = match(/^((?:\\/\\*.*?\\*\\/|'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\((\\s*'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|[^)]*?)\\s*\\)|[^};])+)/);\n\n        const ret = { type: 'declaration', property: prop.replace(comment_regexp, ''), value: val ? val[0].replace(comment_regexp, '').trim() : '' };\n\n        match(/^[;\\s]*/);\n\n        return ret;\n    }\n    function declarations() {\n        if (!open()) { return error('missing \\'{\\''); }\n\n        let d,\n            decls = comments();\n\n        while ((d = declaration())) {\n            decls.push(d);\n            decls = decls.concat(comments());\n        }\n\n        if (!close()) { return error('missing \\'}\\''); }\n\n        return decls;\n    }\n\n    // Keyframes\n    // -------------------------------------------------------------------------\n    function keyframe() {\n        whitespace();\n\n        const vals = [];\n\n        let m;\n\n        while ((m = match(/^((\\d+\\.\\d+|\\.\\d+|\\d+)%?|[a-z]+)\\s*/))) {\n            vals.push(m[1]);\n            match(/^,\\s*/);\n        }\n\n        if (vals.length) { return { type: 'keyframe', values: vals, declarations: declarations() }; }\n    }\n    function at_keyframes() {\n        let m = match(/^@([-\\w]+)?keyframes\\s*/);\n\n        if (!m) { return; }\n\n        const vendor = m[1];\n\n        m = match(/^([-\\w]+)\\s*/);\n        if (!m) { return error('@keyframes missing name'); } // identifier\n\n        const name = m[1];\n\n        if (!open()) { return error('@keyframes missing \\'{\\''); }\n\n        let frame,\n            frames = comments();\n        while ((frame = keyframe())) {\n            frames.push(frame);\n            frames = frames.concat(comments());\n        }\n\n        if (!close()) { return error('@keyframes missing \\'}\\''); }\n\n        return { type: 'keyframes', name: name, vendor: vendor, keyframes: frames };\n    }\n\n    // @ Rules\n    // -------------------------------------------------------------------------\n    function at_page() {\n        const m = match(/^@page */);\n        if (m) {\n            const sel = selector() || [];\n            return { type: 'page', selectors: sel, declarations: declarations() };\n        }\n    }\n    function at_fontface() {\n        const m = match(/^@font-face\\s*/);\n        if (m) { return { type: 'font-face', declarations: declarations() }; }\n    }\n    function at_supports() {\n        const m = match(/^@supports *([^{]+)/);\n        if (m) { return { type: 'supports', supports: m[1].trim(), rules: rules() }; }\n    }\n    function at_host() {\n        const m = match(/^@host\\s*/);\n        if (m) { return { type: 'host', rules: rules() }; }\n    }\n    function at_media() {\n        const m = match(/^@media *([^{]+)/);\n        if (m) { return { type: 'media', media: m[1].trim(), rules: rules() }; }\n    }\n    function at_custom_m() {\n        const m = match(/^@custom-media\\s+(--[^\\s]+)\\s*([^{;]+);/);\n        if (m) { return { type: 'custom-media', name: m[1].trim(), media: m[2].trim() }; }\n    }\n    function at_document() {\n        const m = match(/^@([-\\w]+)?document *([^{]+)/);\n        // FIXED\n        if (m) { return { type: 'document', document: m[2].trim(), vendor: m[1] ? m[1].trim() : null, rules: rules() }; }\n    }\n    function at_x() {\n        const m = match(/^@(import|charset|namespace)\\s*([^;]+);/);\n        if (m) { return { type: m[1], name: m[2].trim() }; }\n    }\n    function at_rule() {\n        whitespace();\n        if (css[0] === '@') { return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x(); }\n    }\n\n    // Rules\n    // -------------------------------------------------------------------------\n    function rule() {\n        const sel = selector() || [];\n        if (!sel.length) { error('selector missing'); }\n\n        const decls = declarations();\n\n        return { type: 'rule', selectors: sel, declarations: decls };\n    }\n    function rules(core) {\n        if (!core && !open()) { return error('missing \\'{\\''); }\n\n        let node,\n            rules = comments();\n\n        while (css.length && (core || css[0] !== '}') && (node = at_rule() || rule())) {\n            rules.push(node);\n            rules = rules.concat(comments());\n        }\n\n        if (!core && !close()) { return error('missing \\'}\\''); }\n\n        return rules;\n    }\n\n    return { type: 'stylesheet', stylesheet: { rules: rules(true), errors: errors } };\n}\n\n\n// Exports\n// =============================================================================\nexport default cssParse;\n","/**\n * Based on rework-vars by reworkcss\n * https://github.com/reworkcss/rework-vars\n */\n\n\n// Dependencies\n// =============================================================================\nimport balanced     from 'balanced-match';\nimport mergeDeep    from './merge-deep';\nimport parseCss     from './parse-css';\nimport stringifyCss from './stringify-css';\nimport walkCss      from './walk-css';\n\n\n// Constants & Variables\n// =============================================================================\nconst persistStore        = {};\nconst VAR_PROP_IDENTIFIER = '--';\nconst VAR_FUNC_IDENTIFIER = 'var';\n\n\n// Functions\n// =============================================================================\n/**\n * Transforms W3C-style CSS variables to static values and returns an updated\n * CSS string.\n *\n * @param {object}   cssText CSS containing variable definitions and functions\n * @param {object}   [options] Options object\n * @param {boolean}  [options.fixNestedCalc=true] Removes nested 'calc' keywords\n *                   for legacy browser compatibility.\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   @font-face and @keyframe rules require all declarations to\n *                   be returned if a CSS variable is used.\n * @param {boolean}  [options.persist=false] Persists options.variables,\n *                   allowing variables set in previous calls to be applied in\n *                   subsequent calls.\n * @param {boolean}  [options.preserve=false] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onWarning] Callback on each transformation\n *                   warning. Passes 1) warningMessage as an argument.\n * @returns {string}\n */\nfunction transformVars(cssText, options = {}) {\n    const defaults = {\n        fixNestedCalc: true,\n        onlyVars     : true,\n        persist      : false,\n        preserve     : false,\n        variables    : {},\n        onWarning() {}\n    };\n    const map       = {};\n    const settings  = mergeDeep(defaults, options);\n    const varSource = settings.persist ? persistStore : settings.variables;\n\n    // Convert cssText to AST (this could throw errors)\n    const cssTree = parseCss(cssText);\n\n    // Remove non-vars\n    if (settings.onlyVars) {\n        cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);\n    }\n\n    // Define variables\n    cssTree.stylesheet.rules.forEach(function(rule) {\n        const varNameIndices = [];\n\n        if (rule.type !== 'rule') {\n            return;\n        }\n\n        // only variables declared for `:root` are supported\n        if (rule.selectors.length !== 1 || rule.selectors[0] !== ':root') {\n            return;\n        }\n\n        rule.declarations.forEach(function(decl, i) {\n            const prop = decl.property;\n            const value = decl.value;\n\n            if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {\n                map[prop] = value;\n                varNameIndices.push(i);\n            }\n        });\n\n        // optionally remove `--*` properties from the rule\n        if (!settings.preserve) {\n            for (let i = varNameIndices.length - 1; i >= 0; i--) {\n                rule.declarations.splice(varNameIndices[i], 1);\n            }\n        }\n    });\n\n    // Handle variables defined in settings.variables\n    Object.keys(settings.variables).forEach(key => {\n        // Convert all property names to leading '--' style\n        const prop  = `--${key.replace(/^-+/, '')}`;\n        const value = settings.variables[key];\n\n        // Update settings.variables\n        if (key !== prop) {\n            settings.variables[prop] = value;\n            delete settings.variables[key];\n        }\n\n        // Store variables so they can be reapplied on subsequent call. For\n        // example, if '--myvar' is set on the first call it should continue to\n        // be set on each call thereafter (otherwise each call removes the\n        // previously set variables).\n        if (settings.persist) {\n            persistStore[prop] = value;\n        }\n    });\n\n    if (Object.keys(varSource).length) {\n        const newRule = {\n            declarations: [],\n            selectors   : [':root'],\n            type        : 'rule'\n        };\n\n        Object.keys(varSource).forEach(function(key) {\n            // Update internal map value with varSource value\n            map[key] = varSource[key];\n\n            // Add new declaration to newRule\n            newRule.declarations.push({\n                type    : 'declaration',\n                property: key,\n                value   : varSource[key]\n            });\n\n            // Add to persistent storage\n            if (settings.persist) {\n                persistStore[key] = varSource[key];\n            }\n        });\n\n        // Append new :root ruleset\n        if (settings.preserve) {\n            cssTree.stylesheet.rules.push(newRule);\n        }\n    }\n\n    // Resolve variables\n    walkCss(cssTree.stylesheet, function(declarations, node) {\n        let decl;\n        let resolvedValue;\n        let value;\n\n        for (let i = 0; i < declarations.length; i++) {\n            decl = declarations[i];\n            value = decl.value;\n\n            // skip comments\n            if (decl.type !== 'declaration') {\n                continue;\n            }\n\n            // skip values that don't contain variable functions\n            if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + '(') === -1) {\n                continue;\n            }\n\n            resolvedValue = resolveValue(value, map, settings);\n\n            if (resolvedValue !== 'undefined') {\n                if (!settings.preserve) {\n                    decl.value = resolvedValue;\n                }\n                else {\n                    declarations.splice(i, 0, {\n                        type    : decl.type,\n                        property: decl.property,\n                        value   : resolvedValue\n                    });\n\n                    // skip ahead of preserved declaration\n                    i++;\n                }\n            }\n        }\n    });\n\n    // Fix nested calc() values\n    if (settings.fixNestedCalc) {\n        fixNestedCalc(cssTree.stylesheet.rules);\n    }\n\n    // Return CSS string\n    return stringifyCss(cssTree);\n}\n\n\n// Functions (Private)\n// =============================================================================\n/**\n * Filters rules recursively, retaining only declarations that contain either a\n * CSS variable definition (property) or function (value). Maintains all\n * declarations for @font-face and @keyframes rules that contain a CSS\n * definition or function.\n *\n * @param {array} rules\n * @returns {array}\n */\nfunction filterVars(rules) {\n    return rules.filter(rule => {\n        // Rule, @font-face, @host, @page\n        if (rule.declarations) {\n            const declArray = rule.declarations.filter(d => {\n                const hasVarProp = d.property && d.property.indexOf(VAR_PROP_IDENTIFIER) === 0;\n                const hasVarVal  = d.value && d.value.indexOf(VAR_FUNC_IDENTIFIER + '(') > -1;\n\n                return hasVarProp || hasVarVal;\n            });\n\n            // For most rule types the filtered declarations should be applied.\n            // @font-face declaratons are unique and require all declarations to\n            // be retained if any declaration contains a CSS variable definition\n            // or value.\n            if (rule.type !== 'font-face') {\n                rule.declarations = declArray;\n            }\n\n            return Boolean(declArray.length);\n        }\n        // @keyframes\n        else if (rule.keyframes) {\n            // @keyframe rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            return Boolean(rule.keyframes.filter(k =>\n                Boolean(k.declarations.filter(d => {\n                    const hasVarProp = d.property && d.property.indexOf(VAR_PROP_IDENTIFIER) === 0;\n                    const hasVarVal  = d.value && d.value.indexOf(VAR_FUNC_IDENTIFIER + '(') > -1;\n\n                    return hasVarProp || hasVarVal;\n                }).length)\n            ).length);\n        }\n        // @document, @media, @supports\n        else if (rule.rules) {\n            rule.rules = filterVars(rule.rules).filter(r => r.declarations && r.declarations.length);\n\n            return Boolean(rule.rules.length);\n        }\n\n        return true;\n    });\n}\n\n/**\n * Removes nested calc keywords for legacy browser compatibility.\n * Example: calc(1 + calc(2 + calc(3 + 3))) => calc(1 + (2 + (3 + 3)))\n *\n * @param {array} rules\n */\nfunction fixNestedCalc(rules) {\n    const reCalcExp = /(-[a-z]+-)?calc\\(/; // Match \"calc(\" or \"-vendor-calc(\"\n\n    rules.forEach(rule => {\n        if (rule.declarations) {\n            rule.declarations.forEach(decl => {\n                let oldValue = decl.value;\n                let newValue = '';\n\n                while (reCalcExp.test(oldValue)) {\n                    const rootCalc = balanced('calc(', ')', oldValue || '');\n\n                    oldValue = oldValue.slice(rootCalc.end);\n\n                    while (reCalcExp.test(rootCalc.body)) {\n                        const nestedCalc = balanced(reCalcExp, ')', rootCalc.body);\n\n                        rootCalc.body = `${nestedCalc.pre}(${nestedCalc.body})${nestedCalc.post}`;\n                    }\n\n                    newValue += `${rootCalc.pre}calc(${rootCalc.body}`;\n                    newValue += !reCalcExp.test(oldValue) ? `)${rootCalc.post}` : '';\n                }\n\n                decl.value = newValue || decl.value;\n            });\n        }\n    });\n}\n\n/**\n * Resolve CSS variables in a value\n *\n * The second argument to a CSS variable function, if provided, is a fallback\n * value, which is used as the substitution value when the referenced variable\n * is invalid.\n *\n * var(name[, fallback])\n *\n * @param {string} value A property value containing a CSS variable function\n * @param {object} map A map of variable names and values\n * @param {object} settings Settings object passed from transformVars()\n * @return {string} A new value with CSS variables substituted or using fallback\n */\nfunction resolveValue(value, map, settings) {\n    // matches `name[, fallback]`, captures 'name' and 'fallback'\n    const RE_VAR = /([\\w-]+)(?:\\s*,\\s*)?(.*)?/;\n    const balancedParens = balanced('(', ')', value);\n    const varStartIndex  = value.indexOf('var(');\n    const varRef         = balanced('(', ')', value.substring(varStartIndex)).body;\n    const warningIntro   = 'CSS transform warning:';\n\n    /* istanbul ignore next */\n    if (!balancedParens) {\n        settings.onWarning(`${warningIntro} missing closing \")\" in the value \"${value}\"`);\n    }\n\n    /* istanbul ignore next */\n    if (varRef === '') {\n        settings.onWarning(`${warningIntro} var() must contain a non-whitespace string`);\n    }\n\n    const varFunc = VAR_FUNC_IDENTIFIER + '(' + varRef + ')';\n\n    const varResult = varRef.replace(RE_VAR, function(_, name, fallback) {\n        const replacement = map[name];\n\n        if (!replacement && !fallback) {\n            settings.onWarning(`${warningIntro} variable \"${name}\" is undefined`);\n        }\n\n        if (!replacement && fallback) {\n            return fallback;\n        }\n\n        return replacement;\n    });\n\n    // resolve the variable\n    value = value.split(varFunc).join(varResult);\n\n    // recursively resolve any remaining variables in the value\n    if (value.indexOf(VAR_FUNC_IDENTIFIER + '(') !== -1) {\n        value = resolveValue(value, map, settings);\n    }\n\n    return value;\n}\n\n\n// Exports\n// =============================================================================\nexport default transformVars;\n","/**\n * Based on rework-visit by reworkcss\n * https://github.com/reworkcss/rework-visit\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Visit `node` declarations recursively and invoke `fn(declarations, node)`.\n *\n * @param {object} node\n * @param {function} fn\n */\nfunction walkCss(node, fn){\n    node.rules.forEach(function(rule){\n        // @media etc\n        if (rule.rules) {\n            walkCss(rule, fn);\n\n            return;\n        }\n\n        // keyframes\n        if (rule.keyframes) {\n            rule.keyframes.forEach(function(keyframe){\n                if (keyframe.type === 'keyframe') {\n                    fn(keyframe.declarations, rule);\n                }\n            });\n\n            return;\n        }\n\n        // @charset, @import etc\n        if (!rule.declarations) {\n            return;\n        }\n\n        fn(rule.declarations, node);\n    });\n}\n\n\n// Exports\n// =============================================================================\nexport default walkCss;\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Compiles CSS AST to string\n *\n * @param {object}   tree CSS AST object\n * @param {string}   [delim=''] CSS rule delimiter\n * @param {function} cb Function to be called before each node is processed\n * @returns {string}\n */\nfunction stringifyCss(tree, delim = '', cb) {\n    const renderMethods = {\n        charset(node) {\n            return '@charset ' + node.name + ';';\n        },\n        comment(node) {\n            // Preserve ponyfill marker comments\n            return node.comment.indexOf('__CSSVARSPONYFILL') === 0 ? '/*' + node.comment + '*/' : '';\n        },\n        'custom-media'(node) {\n            return '@custom-media ' + node.name + ' ' + node.media + ';';\n        },\n        declaration(node) {\n            return node.property + ':' + node.value + ';';\n        },\n        document(node) {\n            return '@' + (node.vendor || '') + 'document ' + node.document + '{' + visit(node.rules) + '}';\n        },\n        'font-face'(node) {\n            return '@font-face' + '{' + visit(node.declarations) + '}';\n        },\n        host(node) {\n            return '@host' + '{' + visit(node.rules) + '}';\n        },\n        import(node) {\n            // FIXED\n            return '@import ' + node.name + ';';\n        },\n        keyframe(node) {\n            return node.values.join(',') + '{' + visit(node.declarations) + '}';\n        },\n        keyframes(node) {\n            return '@' + (node.vendor || '') + 'keyframes ' + node.name + '{' + visit(node.keyframes) + '}';\n        },\n        media(node) {\n            return '@media ' + node.media + '{' + visit(node.rules) + '}';\n        },\n        namespace(node) {\n            return '@namespace ' + node.name + ';';\n        },\n        page(node) {\n            return '@page ' + (node.selectors.length ? node.selectors.join(', ') : '') + '{' + visit(node.declarations) + '}';\n        },\n        rule(node) {\n            const decls = node.declarations;\n\n            if (decls.length) {\n                return node.selectors.join(',') + '{' + visit(decls) + '}';\n            }\n        },\n        supports(node) {\n            // FIXED\n            return '@supports ' + node.supports + '{' + visit(node.rules) + '}';\n        }\n    };\n\n    function visit(nodes) {\n        let buf = '';\n\n        for (let i = 0; i < nodes.length; i++) {\n            const n = nodes[i];\n\n            if (cb) {\n                cb(n);\n            }\n\n            const txt = renderMethods[n.type](n);\n\n            if (txt) {\n                buf += txt;\n\n                if (txt.length && n.selectors) {\n                    buf += delim;\n                }\n            }\n        }\n\n        return buf;\n    }\n\n    return visit(tree.stylesheet.rules);\n}\n\n\n// Exports\n// =============================================================================\nexport default stringifyCss;\n","// Dependencies\n// =============================================================================\nimport getCssData          from 'get-css-data';\nimport mergeDeep           from './merge-deep';\nimport transformCss        from './transform-css';\nimport { name as pkgName } from '../package.json';\n\n\n// Constants & Variables\n// =============================================================================\nconst defaults = {\n    // Sources\n    include      : 'style,link[rel=stylesheet]',\n    exclude      : '',\n    // Options\n    fixNestedCalc: true,  // transformCss\n    onlyLegacy   : true,  // cssVars\n    onlyVars     : false, // cssVars, transformCss\n    preserve     : false, // transformCss\n    silent       : false, // cssVars\n    updateDOM    : true,  // cssVars\n    updateURLs   : true,  // cssVars\n    variables    : {},    // transformCss\n    // Callbacks\n    onBeforeSend() {},    // cssVars\n    onSuccess() {},       // cssVars\n    onWarning() {},       // transformCss\n    onError() {},         // cssVars\n    onComplete() {}       // cssVars\n};\nconst regex = {\n    // CSS comments\n    cssComments: /\\/\\*[\\s\\S]+?\\*\\//g,\n    // CSS url(...) values\n    cssUrls: /url\\((?!['\"]?(?:data|http|\\/\\/):)['\"]?([^'\")]*)['\"]?\\)/g,\n    // CSS variable :root declarations and var() function values\n    cssVars: /(?:(?::root\\s*{\\s*[^;]*;*\\s*)|(?:var\\(\\s*))(--[^:)]+)(?:\\s*[:)])/\n};\n\n\n// Functions\n// =============================================================================\n/**\n * Fetches, parses, and transforms CSS custom properties from specified\n * <style> and <link> elements into static values, then appends a new <style>\n * element with static values to the DOM to provide CSS custom property\n * compatibility for legacy browsers. Also provides a single interface for\n * live updates of runtime values in both modern and legacy browsers.\n *\n * @preserve\n * @param {object}   [options] Options object\n * @param {string}   [options.include=\"style,link[rel=stylesheet]\"] CSS selector\n *                   matching <link re=\"stylesheet\"> and <style> nodes to\n *                   process\n * @param {string}   [options.exclude] CSS selector matching <link\n *                   rel=\"stylehseet\"> and <style> nodes to exclude from those\n *                   matches by options.include\n * @param {boolean}  [options.fixNestedCalc=true] Removes nested 'calc' keywords\n *                   for legacy browser compatibility.\n * @param {boolean}  [options.onlyLegacy=true] Determines if the ponyfill will\n *                   only generate legacy-compatible CSS in browsers that lack\n *                   native support (i.e., legacy browsers)\n * @param {boolean}  [options.onlyVars=false] Determines if CSS rulesets and\n *                   declarations without a custom property value should be\n *                   removed from the ponyfill-generated CSS\n * @param {boolean}  [options.preserve=false] Determines if the original CSS\n *                   custom property declaration will be retained in the\n *                   ponyfill-generated CSS.\n * @param {boolean}  [options.silent=false] Determines if warning and error\n *                   messages will be displayed on the console\n * @param {boolean}  [options.updateDOM=true] Determines if the ponyfill will\n *                   update the DOM after processing CSS custom properties\n * @param {boolean}  [options.updateURLs=true] Determines if the ponyfill will\n *                   convert relative url() paths to absolute urls.\n * @param {object}   [options.variables] A map of custom property name/value\n *                   pairs. Property names can omit or include the leading\n *                   double-hyphen (—), and values specified will override\n *                   previous values.\n * @param {function} [options.onBeforeSend] Callback before XHR is sent. Passes\n *                   1) the XHR object, 2) source node reference, and 3) the\n *                   source URL as arguments.\n * @param {function} [options.onSuccess] Callback after CSS data has been\n *                   collected from each node and before CSS custom properties\n *                   have been transformed. Allows modifying the CSS data before\n *                   it is transformed by returning any string value (or false\n *                   to skip). Passes 1) CSS text, 2) source node reference, and\n *                   3) the source URL as arguments.\n * @param {function} [options.onWarning] Callback after each CSS parsing warning\n *                   has occurred. Passes 1) a warning message as an argument.\n * @param {function} [options.onError] Callback after a CSS parsing error has\n *                   occurred or an XHR request has failed. Passes 1) an error\n *                   message, and 2) source node reference, 3) xhr, and 4 url as\n *                   arguments.\n * @param {function} [options.onComplete] Callback after all CSS has been\n *                   processed, legacy-compatible CSS has been generated, and\n *                   (optionally) the DOM has been updated. Passes 1) a CSS\n *                   string with CSS variable values resolved, and 2) a\n *                   reference to the appended <style> node.\n *\n * @example\n *\n *   cssVars({\n *     include      : 'style,link[rel=\"stylesheet\"]', // default\n *     exclude      : '',\n *     fixNestedCalc: true,  // default\n *     onlyLegacy   : true,  // default\n *     onlyVars     : false, // default\n *     preserve     : false, // default\n *     silent       : false, // default\n *     updateDOM    : true,  // default\n *     updateURLs   : true,  // default\n *     variables    : {\n *       // ...\n *     },\n *     onBeforeSend(xhr, node, url) {\n *       // ...\n *     }\n *     onSuccess(cssText, node, url) {\n *       // ...\n *     },\n *     onWarning(message) {\n *       // ...\n *     },\n *     onError(message, node) {\n *       // ...\n *     },\n *     onComplete(cssText, styleNode) {\n *       // ...\n *     }\n *   });\n */\nfunction cssVars(options = {}) {\n    const settings = mergeDeep(defaults, options);\n\n    function handleError(message, sourceNode, xhr, url) {\n        /* istanbul ignore next */\n        if (!settings.silent) {\n            // eslint-disable-next-line\n            console.error(`${message}\\n`, sourceNode);\n        }\n\n        settings.onError(message, sourceNode, xhr, url);\n    }\n\n    function handleWarning(message) {\n        /* istanbul ignore next */\n        if (!settings.silent) {\n            // eslint-disable-next-line\n            console.warn(message);\n        }\n\n        settings.onWarning(message);\n    }\n\n    // Verify readyState to ensure all <link> and <style> nodes are available\n    if (document.readyState !== 'loading') {\n        const hasNativeSupport = window.CSS && window.CSS.supports && window.CSS.supports('(--a: 0)');\n\n        // Lacks native support or onlyLegacy 'false'\n        if (!hasNativeSupport || !settings.onlyLegacy) {\n            const styleNodeId = pkgName;\n\n            getCssData({\n                include: settings.include,\n                // Always exclude styleNodeId element, which is the generated\n                // <style> node containing previously transformed CSS.\n                exclude: `#${styleNodeId}` + (settings.exclude ? `,${settings.exclude}` : ''),\n                // This filter does a test on each block of CSS. An additional\n                // filter is used in the parser to remove individual\n                // declarations.\n                filter : settings.onlyVars ? regex.cssVars : null,\n                onBeforeSend: settings.onBeforeSend,\n                onSuccess(cssText, node, url) {\n                    const returnVal = settings.onSuccess(cssText, node, url);\n\n                    cssText = returnVal === false ? '' : returnVal || cssText;\n\n                    // Convert relative url(...) values to absolute\n                    if (settings.updateURLs) {\n                        const cssUrls = cssText\n                            // Remove comments to avoid processing @import in comments\n                            .replace(regex.cssComments, '')\n                            // Match url(...) values\n                            .match(regex.cssUrls) || [];\n\n                        cssUrls.forEach(cssUrl => {\n                            const oldUrl = cssUrl.replace(regex.cssUrls, '$1');\n                            const newUrl = getFullUrl(oldUrl, url);\n\n                            cssText = cssText.replace(cssUrl, cssUrl.replace(oldUrl, newUrl));\n                        });\n                    }\n\n                    return cssText;\n                },\n                onError(xhr, node, url) {\n                    const responseUrl = xhr.responseURL || getFullUrl(url, location.href);\n                    const statusText  = xhr.statusText ? `(${xhr.statusText})` : 'Unspecified Error' + (xhr.status === 0 ? ' (possibly CORS related)' : '');\n                    const errorMsg    = `CSS XHR Error: ${responseUrl} ${xhr.status} ${statusText}`;\n\n                    handleError(errorMsg, node, xhr, responseUrl);\n                },\n                onComplete(cssText, cssArray, nodeArray) {\n                    const cssMarker = /\\/\\*__CSSVARSPONYFILL-(\\d+)__\\*\\//g;\n                    let   styleNode = null;\n\n                    // Concatenate cssArray items, replacing those that do not\n                    // contain a CSS custom property declaraion or function with\n                    // a temporary marker . After the CSS is transformed, the\n                    // markers will be replaced with the matching cssArray item.\n                    // This optimization is done to avoid processing CSS that\n                    // will not change as a results of the ponyfill.\n                    cssText = cssArray.map((css, i) => regex.cssVars.test(css) ? css : `/*__CSSVARSPONYFILL-${i}__*/`).join('');\n\n                    try {\n                        cssText = transformCss(cssText, {\n                            fixNestedCalc: settings.fixNestedCalc,\n                            onlyVars     : settings.onlyVars,\n                            persist      : settings.updateDOM,\n                            preserve     : settings.preserve,\n                            variables    : settings.variables,\n                            onWarning    : handleWarning\n                        });\n\n                        let cssMarkerMatch = cssMarker.exec(cssText);\n\n                        // Replace markers with appropriate cssArray item\n                        while (cssMarkerMatch !== null) {\n                            const matchedText   = cssMarkerMatch[0];\n                            const cssArrayIndex = cssMarkerMatch[1];\n\n                            cssText = cssText.replace(matchedText, cssArray[cssArrayIndex]);\n                            cssMarkerMatch = cssMarker.exec(cssText);\n                        }\n\n                        if (settings.updateDOM && nodeArray && nodeArray.length) {\n                            const lastNode = nodeArray[nodeArray.length - 1];\n\n                            styleNode = document.querySelector(`#${styleNodeId}`) || document.createElement('style');\n                            styleNode.setAttribute('id', styleNodeId);\n\n                            if (styleNode.textContent !== cssText) {\n                                styleNode.textContent = cssText;\n                            }\n\n                            // Insert <style> element after last nodeArray item\n                            if (lastNode.nextSibling !== styleNode) {\n                                lastNode.parentNode.insertBefore(styleNode, lastNode.nextSibling);\n                            }\n                        }\n                    }\n                    catch(err) {\n                        let errorThrown = false;\n\n                        // Iterate cssArray to detect CSS text and node(s)\n                        // responsibile for error.\n                        cssArray.forEach((cssText, i) => {\n                            try {\n                                cssText = transformCss(cssText, settings);\n                            }\n                            catch(err) {\n                                const errorNode = nodeArray[i - 0];\n\n                                errorThrown = true;\n                                handleError(err.message, errorNode);\n                            }\n                        });\n\n                        // In the event the error thrown was not due to\n                        // transformCss, handle the original error.\n                        /* istanbul ignore next */\n                        if (!errorThrown) {\n                            handleError(err.message || err);\n                        }\n                    }\n\n                    settings.onComplete(cssText, styleNode);\n                }\n            });\n        }\n        // Has native support\n        else if (hasNativeSupport && settings.updateDOM) {\n            // Set variables using native methods\n            Object.keys(settings.variables).forEach(key => {\n                // Convert all property names to leading '--' style\n                const prop  = `--${key.replace(/^-+/, '')}`;\n                const value = settings.variables[key];\n\n                document.documentElement.style.setProperty(prop, value);\n            });\n        }\n    }\n    // Delay function until DOMContentLoaded event is fired\n    /* istanbul ignore next */\n    else {\n        document.addEventListener('DOMContentLoaded', function init(evt) {\n            cssVars(options);\n\n            document.removeEventListener('DOMContentLoaded', init);\n        });\n    }\n}\n\n\n// Functions (Private)\n// =============================================================================\n/**\n * Returns fully qualified URL from relative URL and (optional) base URL\n *\n * @param {any} url\n * @param {any} [base=location.href]\n * @returns\n */\nfunction getFullUrl(url, base = location.href) {\n    const d = document.implementation.createHTMLDocument('');\n    const b = d.createElement('base');\n    const a = d.createElement('a');\n\n    d.head.appendChild(b);\n    d.body.appendChild(a);\n    b.href = base;\n    a.href = url;\n\n    return a.href;\n}\n\n\n// Export\n// =============================================================================\nexport default 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