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(c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nexport const nativeShadow = !(window['ShadyDOM'] && window['ShadyDOM']['inUse']);\nlet nativeCssVariables_;\n\n/**\n * @param {(ShadyCSSOptions | ShadyCSSInterface)=} settings\n */\nfunction calcCssVariables(settings) {\n if (settings && settings['shimcssproperties']) {\n nativeCssVariables_ = false;\n } else {\n // chrome 49 has semi-working css vars, check if box-shadow works\n // safari 9.1 has a recalc bug: https://bugs.webkit.org/show_bug.cgi?id=155782\n // However, shim css custom properties are only supported with ShadyDOM enabled,\n // so fall back on native if we do not detect ShadyDOM\n // Edge 15: custom properties used in ::before and ::after will also be used in the parent element\n // https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12414257/\n nativeCssVariables_ = nativeShadow || Boolean(!navigator.userAgent.match(/AppleWebKit\\/601|Edge\\/15/) &&\n window.CSS && CSS.supports && CSS.supports('box-shadow', '0 0 0 var(--foo)'));\n }\n}\n\n/** @type {string | undefined} */\nexport let cssBuild;\nif (window.ShadyCSS && window.ShadyCSS.cssBuild !== undefined) {\n cssBuild = window.ShadyCSS.cssBuild;\n}\n\nif (window.ShadyCSS && window.ShadyCSS.nativeCss !== undefined) {\n nativeCssVariables_ = window.ShadyCSS.nativeCss;\n} else if (window.ShadyCSS) {\n calcCssVariables(window.ShadyCSS);\n // reset window variable to let ShadyCSS API take its place\n window.ShadyCSS = undefined;\n} else {\n calcCssVariables(window['WebComponents'] && window['WebComponents']['flags']);\n}\n\n// Hack for type error under new type inference which doesn't like that\n// nativeCssVariables is updated in a function and assigns the type\n// `function(): ?` instead of `boolean`.\nexport const nativeCssVariables = /** @type {boolean} */(nativeCssVariables_);","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n/*\nExtremely simple css parser. Intended to be not more than what we need\nand definitely not necessarily correct =).\n*/\n\n'use strict';\n\n/** @unrestricted */\nclass StyleNode {\n constructor() {\n /** @type {number} */\n this['start'] = 0;\n /** @type {number} */\n this['end'] = 0;\n /** @type {StyleNode} */\n this['previous'] = null;\n /** @type {StyleNode} */\n this['parent'] = null;\n /** @type {Array<StyleNode>} */\n this['rules'] = null;\n /** @type {string} */\n this['parsedCssText'] = '';\n /** @type {string} */\n this['cssText'] = '';\n /** @type {boolean} */\n this['atRule'] = false;\n /** @type {number} */\n this['type'] = 0;\n /** @type {string} */\n this['keyframesName'] = '';\n /** @type {string} */\n this['selector'] = '';\n /** @type {string} */\n this['parsedSelector'] = '';\n }\n}\n\nexport {StyleNode}\n\n// given a string of css, return a simple rule tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nexport function parse(text) {\n text = clean(text);\n return parseCss(lex(text), text);\n}\n\n// remove stuff we don't care about that may hinder parsing\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction clean(cssText) {\n return cssText.replace(RX.comments, '').replace(RX.port, '');\n}\n\n// super simple {...} lexer that returns a node tree\n/**\n * @param {string} text\n * @return {StyleNode}\n */\nfunction lex(text) {\n let root = new StyleNode();\n root['start'] = 0;\n root['end'] = text.length\n let n = root;\n for (let i = 0, l = text.length; i < l; i++) {\n if (text[i] === OPEN_BRACE) {\n if (!n['rules']) {\n n['rules'] = [];\n }\n let p = n;\n let previous = p['rules'][p['rules'].length - 1] || null;\n n = new StyleNode();\n n['start'] = i + 1;\n n['parent'] = p;\n n['previous'] = previous;\n p['rules'].push(n);\n } else if (text[i] === CLOSE_BRACE) {\n n['end'] = i + 1;\n n = n['parent'] || root;\n }\n }\n return root;\n}\n\n// add selectors/cssText to node tree\n/**\n * @param {StyleNode} node\n * @param {string} text\n * @return {StyleNode}\n */\nfunction parseCss(node, text) {\n let t = text.substring(node['start'], node['end'] - 1);\n node['parsedCssText'] = node['cssText'] = t.trim();\n if (node['parent']) {\n let ss = node['previous'] ? node['previous']['end'] : node['parent']['start'];\n t = text.substring(ss, node['start'] - 1);\n t = _expandUnicodeEscapes(t);\n t = t.replace(RX.multipleSpaces, ' ');\n // TODO(sorvell): ad hoc; make selector include only after last ;\n // helps with mixin syntax\n t = t.substring(t.lastIndexOf(';') + 1);\n let s = node['parsedSelector'] = node['selector'] = t.trim();\n node['atRule'] = (s.indexOf(AT_START) === 0);\n // note, support a subset of rule types...\n if (node['atRule']) {\n if (s.indexOf(MEDIA_START) === 0) {\n node['type'] = types.MEDIA_RULE;\n } else if (s.match(RX.keyframesRule)) {\n node['type'] = types.KEYFRAMES_RULE;\n node['keyframesName'] =\n node['selector'].split(RX.multipleSpaces).pop();\n }\n } else {\n if (s.indexOf(VAR_START) === 0) {\n node['type'] = types.MIXIN_RULE;\n } else {\n node['type'] = types.STYLE_RULE;\n }\n }\n }\n let r$ = node['rules'];\n if (r$) {\n for (let i = 0, l = r$.length, r;\n (i < l) && (r = r$[i]); i++) {\n parseCss(r, text);\n }\n }\n return node;\n}\n\n/**\n * conversion of sort unicode escapes with spaces like `\\33 ` (and longer) into\n * expanded form that doesn't require trailing space `\\000033`\n * @param {string} s\n * @return {string}\n */\nfunction _expandUnicodeEscapes(s) {\n return s.replace(/\\\\([0-9a-f]{1,6})\\s/gi, function() {\n let code = arguments[1],\n repeat = 6 - code.length;\n while (repeat--) {\n code = '0' + code;\n }\n return '\\\\' + code;\n });\n}\n\n/**\n * stringify parsed css.\n * @param {StyleNode} node\n * @param {boolean=} preserveProperties\n * @param {string=} text\n * @return {string}\n */\nexport function stringify(node, preserveProperties, text = '') {\n // calc rule cssText\n let cssText = '';\n if (node['cssText'] || node['rules']) {\n let r$ = node['rules'];\n if (r$ && !_hasMixinRules(r$)) {\n for (let i = 0, l = r$.length, r;\n (i < l) && (r = r$[i]); i++) {\n cssText = stringify(r, preserveProperties, cssText);\n }\n } else {\n cssText = preserveProperties ? node['cssText'] :\n removeCustomProps(node['cssText']);\n cssText = cssText.trim();\n if (cssText) {\n cssText = ' ' + cssText + '\\n';\n }\n }\n }\n // emit rule if there is cssText\n if (cssText) {\n if (node['selector']) {\n text += node['selector'] + ' ' + OPEN_BRACE + '\\n';\n }\n text += cssText;\n if (node['selector']) {\n text += CLOSE_BRACE + '\\n\\n';\n }\n }\n return text;\n}\n\n/**\n * @param {Array<StyleNode>} rules\n * @return {boolean}\n */\nfunction _hasMixinRules(rules) {\n let r = rules[0];\n return Boolean(r) && Boolean(r['selector']) && r['selector'].indexOf(VAR_START) === 0;\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomProps(cssText) {\n cssText = removeCustomPropAssignment(cssText);\n return removeCustomPropApply(cssText);\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nexport function removeCustomPropAssignment(cssText) {\n return cssText\n .replace(RX.customProp, '')\n .replace(RX.mixinProp, '');\n}\n\n/**\n * @param {string} cssText\n * @return {string}\n */\nfunction removeCustomPropApply(cssText) {\n return cssText\n .replace(RX.mixinApply, '')\n .replace(RX.varApply, '');\n}\n\n/** @enum {number} */\nexport const types = {\n STYLE_RULE: 1,\n KEYFRAMES_RULE: 7,\n MEDIA_RULE: 4,\n MIXIN_RULE: 1000\n}\n\nconst OPEN_BRACE = '{';\nconst CLOSE_BRACE = '}';\n\n// helper regexp's\nconst RX = {\n comments: /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//gim,\n port: /@import[^;]*;/gim,\n customProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?(?:[;\\n]|$)/gim,\n mixinProp: /(?:^[^;\\-\\s}]+)?--[^;{}]*?:[^{};]*?{[^}]*?}(?:[;\\n]|$)?/gim,\n mixinApply: /@apply\\s*\\(?[^);]*\\)?\\s*(?:[;\\n]|$)?/gim,\n varApply: /[^;:]*?:[^;]*?var\\([^;]*\\)(?:[;\\n]|$)?/gim,\n keyframesRule: /^@[^\\s]*keyframes/,\n multipleSpaces: /\\s+/g\n}\n\nconst VAR_START = '--';\nconst MEDIA_START = '@media';\nconst AT_START = '@';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\nexport const VAR_ASSIGN = /(?:^|[;\\s{]\\s*)(--[\\w-]*?)\\s*:\\s*(?:((?:'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\([^)]*?\\)|[^};{])+)|\\{([^}]*)\\}(?:(?=[;\\s}])|$))/gi;\nexport const MIXIN_MATCH = /(?:^|\\W+)@apply\\s*\\(?([^);\\n]*)\\)?/gi;\nexport const VAR_CONSUMED = /(--[\\w-]+)\\s*([:,;)]|$)/gi;\nexport const ANIMATION_MATCH = /(animation\\s*:)|(animation-name\\s*:)/;\nexport const MEDIA_MATCH = /@media\\s(.*)/;\nexport const IS_VAR = /^--/;\nexport const BRACKETED = /\\{[^}]*\\}/g;\nexport const HOST_PREFIX = '(?:^|[^.#[:])';\nexport const HOST_SUFFIX = '($|[.:[\\\\s>+~])';\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/** @type {!Set<string>} */\nconst styleTextSet = new Set();\n\nexport const scopingAttribute = 'shady-unscoped';\n\n/**\n * Add a specifically-marked style to the document directly, and only one copy of that style.\n *\n * @param {!HTMLStyleElement} style\n * @return {undefined}\n */\nexport function processUnscopedStyle(style) {\n const text = style.textContent;\n if (!styleTextSet.has(text)) {\n styleTextSet.add(text);\n const newStyle = style.cloneNode(true);\n document.head.appendChild(newStyle);\n }\n}\n\n/**\n * Check if a style is supposed to be unscoped\n * @param {!HTMLStyleElement} style\n * @return {boolean} true if the style has the unscoping attribute\n */\nexport function isUnscopedStyle(style) {\n return style.hasAttribute(scopingAttribute);\n}","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport {nativeShadow, nativeCssVariables, cssBuild} from './style-settings.js';\nimport {parse, stringify, types, StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\nimport {MEDIA_MATCH} from './common-regex.js';\nimport {processUnscopedStyle, isUnscopedStyle} from './unscoped-style-handler.js';\n\n/**\n * @param {string|StyleNode} rules\n * @param {function(StyleNode)=} callback\n * @return {string}\n */\nexport function toCssText (rules, callback) {\n if (!rules) {\n return '';\n }\n if (typeof rules === 'string') {\n rules = parse(rules);\n }\n if (callback) {\n forEachRule(rules, callback);\n }\n return stringify(rules, nativeCssVariables);\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @return {StyleNode}\n */\nexport function rulesForStyle(style) {\n if (!style['__cssRules'] && style.textContent) {\n style['__cssRules'] = parse(style.textContent);\n }\n return style['__cssRules'] || null;\n}\n\n// Tests if a rule is a keyframes selector, which looks almost exactly\n// like a normal selector but is not (it has nothing to do with scoping\n// for example).\n/**\n * @param {StyleNode} rule\n * @return {boolean}\n */\nexport function isKeyframesSelector(rule) {\n return Boolean(rule['parent']) &&\n rule['parent']['type'] === types.KEYFRAMES_RULE;\n}\n\n/**\n * @param {StyleNode} node\n * @param {Function=} styleRuleCallback\n * @param {Function=} keyframesRuleCallback\n * @param {boolean=} onlyActiveRules\n */\nexport function forEachRule(node, styleRuleCallback, keyframesRuleCallback, onlyActiveRules) {\n if (!node) {\n return;\n }\n let skipRules = false;\n let type = node['type'];\n if (onlyActiveRules) {\n if (type === types.MEDIA_RULE) {\n let matchMedia = node['selector'].match(MEDIA_MATCH);\n if (matchMedia) {\n // if rule is a non matching @media rule, skip subrules\n if (!window.matchMedia(matchMedia[1]).matches) {\n skipRules = true;\n }\n }\n }\n }\n if (type === types.STYLE_RULE) {\n styleRuleCallback(node);\n } else if (keyframesRuleCallback &&\n type === types.KEYFRAMES_RULE) {\n keyframesRuleCallback(node);\n } else if (type === types.MIXIN_RULE) {\n skipRules = true;\n }\n let r$ = node['rules'];\n if (r$ && !skipRules) {\n for (let i=0, l=r$.length, r; (i<l) && (r=r$[i]); i++) {\n forEachRule(r, styleRuleCallback, keyframesRuleCallback, onlyActiveRules);\n }\n }\n}\n\n// add a string of cssText to the document.\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @param {Node} target\n * @param {Node} contextNode\n * @return {HTMLStyleElement}\n */\nexport function applyCss(cssText, moniker, target, contextNode) {\n let style = createScopeStyle(cssText, moniker);\n applyStyle(style, target, contextNode);\n return style;\n}\n\n/**\n * @param {string} cssText\n * @param {string} moniker\n * @return {HTMLStyleElement}\n */\nexport function createScopeStyle(cssText, moniker) {\n let style = /** @type {HTMLStyleElement} */(document.createElement('style'));\n if (moniker) {\n style.setAttribute('scope', moniker);\n }\n style.textContent = cssText;\n return style;\n}\n\n/**\n * Track the position of the last added style for placing placeholders\n * @type {Node}\n */\nlet lastHeadApplyNode = null;\n\n// insert a comment node as a styling position placeholder.\n/**\n * @param {string} moniker\n * @return {!Comment}\n */\nexport function applyStylePlaceHolder(moniker) {\n let placeHolder = document.createComment(' Shady DOM styles for ' +\n moniker + ' ');\n let after = lastHeadApplyNode ?\n lastHeadApplyNode['nextSibling'] : null;\n let scope = document.head;\n scope.insertBefore(placeHolder, after || scope.firstChild);\n lastHeadApplyNode = placeHolder;\n return placeHolder;\n}\n\n/**\n * @param {HTMLStyleElement} style\n * @param {?Node} target\n * @param {?Node} contextNode\n */\nexport function applyStyle(style, target, contextNode) {\n target = target || document.head;\n let after = (contextNode && contextNode.nextSibling) ||\n target.firstChild;\n target.insertBefore(style, after);\n if (!lastHeadApplyNode) {\n lastHeadApplyNode = style;\n } else {\n // only update lastHeadApplyNode if the new style is inserted after the old lastHeadApplyNode\n let position = style.compareDocumentPosition(lastHeadApplyNode);\n if (position === Node.DOCUMENT_POSITION_PRECEDING) {\n lastHeadApplyNode = style;\n }\n }\n}\n\n/**\n * @param {string} buildType\n * @return {boolean}\n */\nexport function isTargetedBuild(buildType) {\n return nativeShadow ? buildType === 'shadow' : buildType === 'shady';\n}\n\n/**\n * Walk from text[start] matching parens and\n * returns position of the outer end paren\n * @param {string} text\n * @param {number} start\n * @return {number}\n */\nexport function findMatchingParen(text, start) {\n let level = 0;\n for (let i=start, l=text.length; i < l; i++) {\n if (text[i] === '(') {\n level++;\n } else if (text[i] === ')') {\n if (--level === 0) {\n return i;\n }\n }\n }\n return -1;\n}\n\n/**\n * @param {string} str\n * @param {function(string, string, string, string)} callback\n */\nexport function processVariableAndFallback(str, callback) {\n // find 'var('\n let start = str.indexOf('var(');\n if (start === -1) {\n // no var?, everything is prefix\n return callback(str, '', '', '');\n }\n //${prefix}var(${inner})${suffix}\n let end = findMatchingParen(str, start + 3);\n let inner = str.substring(start + 4, end);\n let prefix = str.substring(0, start);\n // suffix may have other variables\n let suffix = processVariableAndFallback(str.substring(end + 1), callback);\n let comma = inner.indexOf(',');\n // value and fallback args should be trimmed to match in property lookup\n if (comma === -1) {\n // variable, no fallback\n return callback(prefix, inner.trim(), '', suffix);\n }\n // var(${value},${fallback})\n let value = inner.substring(0, comma).trim();\n let fallback = inner.substring(comma + 1).trim();\n return callback(prefix, value, fallback, suffix);\n}\n\n/**\n * @param {Element} element\n * @param {string} value\n */\nexport function setElementClassRaw(element, value) {\n // use native setAttribute provided by ShadyDOM when setAttribute is patched\n if (nativeShadow) {\n element.setAttribute('class', value);\n } else {\n window['ShadyDOM']['nativeMethods']['setAttribute'].call(element, 'class', value);\n }\n}\n\nexport const wrap = window['ShadyDOM'] && window['ShadyDOM']['wrap'] || ((node) => node);\n\n/**\n * @param {Element | {is: string, extends: string}} element\n * @return {{is: string, typeExtension: string}}\n */\nexport function getIsExtends(element) {\n let localName = element['localName'];\n let is = '', typeExtension = '';\n /*\n NOTE: technically, this can be wrong for certain svg elements\n with `-` in the name like `<font-face>`\n */\n if (localName) {\n if (localName.indexOf('-') > -1) {\n is = localName;\n } else {\n typeExtension = localName;\n is = (element.getAttribute && element.getAttribute('is')) || '';\n }\n } else {\n is = /** @type {?} */(element).is;\n typeExtension = /** @type {?} */(element).extends;\n }\n return {is, typeExtension};\n}\n\n/**\n * @param {Element|DocumentFragment} element\n * @return {string}\n */\nexport function gatherStyleText(element) {\n /** @type {!Array<string>} */\n const styleTextParts = [];\n const styles = /** @type {!NodeList<!HTMLStyleElement>} */(element.querySelectorAll('style'));\n for (let i = 0; i < styles.length; i++) {\n const style = styles[i];\n if (isUnscopedStyle(style)) {\n if (!nativeShadow) {\n processUnscopedStyle(style);\n style.parentNode.removeChild(style);\n }\n } else {\n styleTextParts.push(style.textContent);\n style.parentNode.removeChild(style);\n }\n }\n return styleTextParts.join('').trim();\n}\n\n/**\n * Split a selector separated by commas into an array in a smart way\n * @param {string} selector\n * @return {!Array<string>}\n */\nexport function splitSelectorList(selector) {\n const parts = [];\n let part = '';\n for (let i = 0; i >= 0 && i < selector.length; i++) {\n // A selector with parentheses will be one complete part\n if (selector[i] === '(') {\n // find the matching paren\n const end = findMatchingParen(selector, i);\n // push the paren block into the part\n part += selector.slice(i, end + 1);\n // move the index to after the paren block\n i = end;\n } else if (selector[i] === ',') {\n parts.push(part);\n part = '';\n } else {\n part += selector[i];\n }\n }\n // catch any pieces after the last comma\n if (part) {\n parts.push(part);\n }\n return parts;\n}\n\nconst CSS_BUILD_ATTR = 'css-build';\n\n/**\n * Return the polymer-css-build \"build type\" applied to this element\n *\n * @param {!HTMLElement} element\n * @return {string} Can be \"\", \"shady\", or \"shadow\"\n */\nexport function getCssBuild(element) {\n if (cssBuild !== undefined) {\n return /** @type {string} */(cssBuild);\n }\n if (element.__cssBuild === undefined) {\n // try attribute first, as it is the common case\n const attrValue = element.getAttribute(CSS_BUILD_ATTR);\n if (attrValue) {\n element.__cssBuild = attrValue;\n } else {\n const buildComment = getBuildComment(element);\n if (buildComment !== '') {\n // remove build comment so it is not needlessly copied into every element instance\n removeBuildComment(element);\n }\n element.__cssBuild = buildComment;\n }\n }\n return element.__cssBuild || '';\n}\n\n/**\n * Check if the given element, either a <template> or <style>, has been processed\n * by polymer-css-build.\n *\n * If so, then we can make a number of optimizations:\n * - polymer-css-build will decompose mixins into individual CSS Custom Properties,\n * so the ApplyShim can be skipped entirely.\n * - Under native ShadowDOM, the style text can just be copied into each instance\n * without modification\n * - If the build is \"shady\" and ShadyDOM is in use, the styling does not need\n * scoping beyond the shimming of CSS Custom Properties\n *\n * @param {!HTMLElement} element\n * @return {boolean}\n */\nexport function elementHasBuiltCss(element) {\n return getCssBuild(element) !== '';\n}\n\n/**\n * For templates made with tagged template literals, polymer-css-build will\n * insert a comment of the form `<!--css-build:shadow-->`\n *\n * @param {!HTMLElement} element\n * @return {string}\n */\nexport function getBuildComment(element) {\n const buildComment = element.localName === 'template' ?\n /** @type {!HTMLTemplateElement} */ (element).content.firstChild :\n element.firstChild;\n if (buildComment instanceof Comment) {\n const commentParts = buildComment.textContent.trim().split(':');\n if (commentParts[0] === CSS_BUILD_ATTR) {\n return commentParts[1];\n }\n }\n return '';\n}\n\n/**\n * Check if the css build status is optimal, and do no unneeded work.\n *\n * @param {string=} cssBuild CSS build status\n * @return {boolean} css build is optimal or not\n */\nexport function isOptimalCssBuild(cssBuild = '') {\n // CSS custom property shim always requires work\n if (cssBuild === '' || !nativeCssVariables) {\n return false;\n }\n return nativeShadow ? cssBuild === 'shadow' : cssBuild === 'shady';\n}\n\n/**\n * @param {!HTMLElement} element\n */\nfunction removeBuildComment(element) {\n const buildComment = element.localName === 'template' ?\n /** @type {!HTMLTemplateElement} */ (element).content.firstChild :\n element.firstChild;\n buildComment.parentNode.removeChild(buildComment);\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n/*\n * The apply shim simulates the behavior of `@apply` proposed at\n * https://tabatkins.github.io/specs/css-apply-rule/.\n * The approach is to convert a property like this:\n *\n * --foo: {color: red; background: blue;}\n *\n * to this:\n *\n * --foo_-_color: red;\n * --foo_-_background: blue;\n *\n * Then where `@apply --foo` is used, that is converted to:\n *\n * color: var(--foo_-_color);\n * background: var(--foo_-_background);\n *\n * This approach generally works but there are some issues and limitations.\n * Consider, for example, that somewhere *between* where `--foo` is set and used,\n * another element sets it to:\n *\n * --foo: { border: 2px solid red; }\n *\n * We must now ensure that the color and background from the previous setting\n * do not apply. This is accomplished by changing the property set to this:\n *\n * --foo_-_border: 2px solid red;\n * --foo_-_color: initial;\n * --foo_-_background: initial;\n *\n * This works but introduces one new issue.\n * Consider this setup at the point where the `@apply` is used:\n *\n * background: orange;\n * `@apply` --foo;\n *\n * In this case the background will be unset (initial) rather than the desired\n * `orange`. We address this by altering the property set to use a fallback\n * value like this:\n *\n * color: var(--foo_-_color);\n * background: var(--foo_-_background, orange);\n * border: var(--foo_-_border);\n *\n * Note that the default is retained in the property set and the `background` is\n * the desired `orange`. This leads us to a limitation.\n *\n * Limitation 1:\n\n * Only properties in the rule where the `@apply`\n * is used are considered as default values.\n * If another rule matches the element and sets `background` with\n * less specificity than the rule in which `@apply` appears,\n * the `background` will not be set.\n *\n * Limitation 2:\n *\n * When using Polymer's `updateStyles` api, new properties may not be set for\n * `@apply` properties.\n\n*/\n\n'use strict';\n\nimport {forEachRule, processVariableAndFallback, rulesForStyle, toCssText, gatherStyleText} from './style-util.js';\nimport {MIXIN_MATCH, VAR_ASSIGN} from './common-regex.js';\nimport {detectMixin} from './common-utils.js';\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\n\nconst APPLY_NAME_CLEAN = /;\\s*/m;\nconst INITIAL_INHERIT = /^\\s*(initial)|(inherit)\\s*$/;\nconst IMPORTANT = /\\s*!important/;\n\n// separator used between mixin-name and mixin-property-name when producing properties\n// NOTE: plain '-' may cause collisions in user styles\nconst MIXIN_VAR_SEP = '_-_';\n\n/**\n * @typedef {!Object<string, string>}\n */\nlet PropertyEntry; // eslint-disable-line no-unused-vars\n\n/**\n * @typedef {!Object<string, boolean>}\n */\nlet DependantsEntry; // eslint-disable-line no-unused-vars\n\n/** @typedef {{\n * properties: PropertyEntry,\n * dependants: DependantsEntry\n * }}\n */\nlet MixinMapEntry; // eslint-disable-line no-unused-vars\n\n// map of mixin to property names\n// --foo: {border: 2px} -> {properties: {(--foo, ['border'])}, dependants: {'element-name': proto}}\nclass MixinMap {\n constructor() {\n /** @type {!Object<string, !MixinMapEntry>} */\n this._map = {};\n }\n /**\n * @param {string} name\n * @param {!PropertyEntry} props\n */\n set(name, props) {\n name = name.trim();\n this._map[name] = {\n properties: props,\n dependants: {}\n }\n }\n /**\n * @param {string} name\n * @return {MixinMapEntry}\n */\n get(name) {\n name = name.trim();\n return this._map[name] || null;\n }\n}\n\n/**\n * Callback for when an element is marked invalid\n * @type {?function(string)}\n */\nlet invalidCallback = null;\n\n/** @unrestricted */\nclass ApplyShim {\n constructor() {\n /** @type {?string} */\n this._currentElement = null;\n /** @type {HTMLMetaElement} */\n this._measureElement = null;\n this._map = new MixinMap();\n }\n /**\n * return true if `cssText` contains a mixin definition or consumption\n * @param {string} cssText\n * @return {boolean}\n */\n detectMixin(cssText) {\n return detectMixin(cssText);\n }\n\n /**\n * Gather styles into one style for easier processing\n * @param {!HTMLTemplateElement} template\n * @return {HTMLStyleElement}\n */\n gatherStyles(template) {\n const styleText = gatherStyleText(template.content);\n if (styleText) {\n const style = /** @type {!HTMLStyleElement} */(document.createElement('style'));\n style.textContent = styleText;\n template.content.insertBefore(style, template.content.firstChild);\n return style;\n }\n return null;\n }\n /**\n * @param {!HTMLTemplateElement} template\n * @param {string} elementName\n * @return {StyleNode}\n */\n transformTemplate(template, elementName) {\n if (template._gatheredStyle === undefined) {\n template._gatheredStyle = this.gatherStyles(template);\n }\n /** @type {HTMLStyleElement} */\n const style = template._gatheredStyle;\n return style ? this.transformStyle(style, elementName) : null;\n }\n /**\n * @param {!HTMLStyleElement} style\n * @param {string} elementName\n * @return {StyleNode}\n */\n transformStyle(style, elementName = '') {\n let ast = rulesForStyle(style);\n this.transformRules(ast, elementName);\n style.textContent = toCssText(ast);\n return ast;\n }\n /**\n * @param {!HTMLStyleElement} style\n * @return {StyleNode}\n */\n transformCustomStyle(style) {\n let ast = rulesForStyle(style);\n forEachRule(ast, (rule) => {\n if (rule['selector'] === ':root') {\n rule['selector'] = 'html';\n }\n this.transformRule(rule);\n })\n style.textContent = toCssText(ast);\n return ast;\n }\n /**\n * @param {StyleNode} rules\n * @param {string} elementName\n */\n transformRules(rules, elementName) {\n this._currentElement = elementName;\n forEachRule(rules, (r) => {\n this.transformRule(r);\n });\n this._currentElement = null;\n }\n /**\n * @param {!StyleNode} rule\n */\n transformRule(rule) {\n rule['cssText'] = this.transformCssText(rule['parsedCssText'], rule);\n // :root was only used for variable assignment in property shim,\n // but generates invalid selectors with real properties.\n // replace with `:host > *`, which serves the same effect\n if (rule['selector'] === ':root') {\n rule['selector'] = ':host > *';\n }\n }\n /**\n * @param {string} cssText\n * @param {!StyleNode} rule\n * @return {string}\n */\n transformCssText(cssText, rule) {\n // produce variables\n cssText = cssText.replace(VAR_ASSIGN, (matchText, propertyName, valueProperty, valueMixin) =>\n this._produceCssProperties(matchText, propertyName, valueProperty, valueMixin, rule));\n // consume mixins\n return this._consumeCssProperties(cssText, rule);\n }\n /**\n * @param {string} property\n * @return {string}\n */\n _getInitialValueForProperty(property) {\n if (!this._measureElement) {\n this._measureElement = /** @type {HTMLMetaElement} */(document.createElement('meta'));\n this._measureElement.setAttribute('apply-shim-measure', '');\n this._measureElement.style.all = 'initial';\n document.head.appendChild(this._measureElement);\n }\n return window.getComputedStyle(this._measureElement).getPropertyValue(property);\n }\n /**\n * Walk over all rules before this rule to find fallbacks for mixins\n *\n * @param {!StyleNode} startRule\n * @return {!Object}\n */\n _fallbacksFromPreviousRules(startRule) {\n // find the \"top\" rule\n let topRule = startRule;\n while (topRule['parent']) {\n topRule = topRule['parent'];\n }\n const fallbacks = {};\n let seenStartRule = false;\n forEachRule(topRule, (r) => {\n // stop when we hit the input rule\n seenStartRule = seenStartRule || r === startRule;\n if (seenStartRule) {\n return;\n }\n // NOTE: Only matching selectors are \"safe\" for this fallback processing\n // It would be prohibitive to run `matchesSelector()` on each selector,\n // so we cheat and only check if the same selector string is used, which\n // guarantees things like specificity matching\n if (r['selector'] === startRule['selector']) {\n Object.assign(fallbacks, this._cssTextToMap(r['parsedCssText']));\n }\n });\n return fallbacks;\n }\n /**\n * replace mixin consumption with variable consumption\n * @param {string} text\n * @param {!StyleNode=} rule\n * @return {string}\n */\n _consumeCssProperties(text, rule) {\n /** @type {Array} */\n let m = null;\n // loop over text until all mixins with defintions have been applied\n while((m = MIXIN_MATCH.exec(text))) {\n let matchText = m[0];\n let mixinName = m[1];\n let idx = m.index;\n // collect properties before apply to be \"defaults\" if mixin might override them\n // match includes a \"prefix\", so find the start and end positions of @apply\n let applyPos = idx + matchText.indexOf('@apply');\n let afterApplyPos = idx + matchText.length;\n // find props defined before this @apply\n let textBeforeApply = text.slice(0, applyPos);\n let textAfterApply = text.slice(afterApplyPos);\n let defaults = rule ? this._fallbacksFromPreviousRules(rule) : {};\n Object.assign(defaults, this._cssTextToMap(textBeforeApply));\n let replacement = this._atApplyToCssProperties(mixinName, defaults);\n // use regex match position to replace mixin, keep linear processing time\n text = `${textBeforeApply}${replacement}${textAfterApply}`;\n // move regex search to _after_ replacement\n MIXIN_MATCH.lastIndex = idx + replacement.length;\n }\n return text;\n }\n /**\n * produce variable consumption at the site of mixin consumption\n * `@apply` --foo; -> for all props (${propname}: var(--foo_-_${propname}, ${fallback[propname]}}))\n * Example:\n * border: var(--foo_-_border); padding: var(--foo_-_padding, 2px)\n *\n * @param {string} mixinName\n * @param {Object} fallbacks\n * @return {string}\n */\n _atApplyToCssProperties(mixinName, fallbacks) {\n mixinName = mixinName.replace(APPLY_NAME_CLEAN, '');\n let vars = [];\n let mixinEntry = this._map.get(mixinName);\n // if we depend on a mixin before it is created\n // make a sentinel entry in the map to add this element as a dependency for when it is defined.\n if (!mixinEntry) {\n this._map.set(mixinName, {});\n mixinEntry = this._map.get(mixinName);\n }\n if (mixinEntry) {\n if (this._currentElement) {\n mixinEntry.dependants[this._currentElement] = true;\n }\n let p, parts, f;\n const properties = mixinEntry.properties;\n for (p in properties) {\n f = fallbacks && fallbacks[p];\n parts = [p, ': var(', mixinName, MIXIN_VAR_SEP, p];\n if (f) {\n parts.push(',', f.replace(IMPORTANT, ''));\n }\n parts.push(')');\n if (IMPORTANT.test(properties[p])) {\n parts.push(' !important');\n }\n vars.push(parts.join(''));\n }\n }\n return vars.join('; ');\n }\n\n /**\n * @param {string} property\n * @param {string} value\n * @return {string}\n */\n _replaceInitialOrInherit(property, value) {\n let match = INITIAL_INHERIT.exec(value);\n if (match) {\n if (match[1]) {\n // initial\n // replace `initial` with the concrete initial value for this property\n value = this._getInitialValueForProperty(property);\n } else {\n // inherit\n // with this purposfully illegal value, the variable will be invalid at\n // compute time (https://www.w3.org/TR/css-variables/#invalid-at-computed-value-time)\n // and for inheriting values, will behave similarly\n // we cannot support the same behavior for non inheriting values like 'border'\n value = 'apply-shim-inherit';\n }\n }\n return value;\n }\n\n /**\n * \"parse\" a mixin definition into a map of properties and values\n * cssTextToMap('border: 2px solid black') -> ('border', '2px solid black')\n * @param {string} text\n * @param {boolean=} replaceInitialOrInherit\n * @return {!Object<string, string>}\n */\n _cssTextToMap(text, replaceInitialOrInherit = false) {\n let props = text.split(';');\n let property, value;\n let out = {};\n for (let i = 0, p, sp; i < props.length; i++) {\n p = props[i];\n if (p) {\n sp = p.split(':');\n // ignore lines that aren't definitions like @media\n if (sp.length > 1) {\n property = sp[0].trim();\n // some properties may have ':' in the value, like data urls\n value = sp.slice(1).join(':');\n if (replaceInitialOrInherit) {\n value = this._replaceInitialOrInherit(property, value);\n }\n out[property] = value;\n }\n }\n }\n return out;\n }\n\n /**\n * @param {MixinMapEntry} mixinEntry\n */\n _invalidateMixinEntry(mixinEntry) {\n if (!invalidCallback) {\n return;\n }\n for (let elementName in mixinEntry.dependants) {\n if (elementName !== this._currentElement) {\n invalidCallback(elementName);\n }\n }\n }\n\n /**\n * @param {string} matchText\n * @param {string} propertyName\n * @param {?string} valueProperty\n * @param {?string} valueMixin\n * @param {!StyleNode} rule\n * @return {string}\n */\n _produceCssProperties(matchText, propertyName, valueProperty, valueMixin, rule) {\n // handle case where property value is a mixin\n if (valueProperty) {\n // form: --mixin2: var(--mixin1), where --mixin1 is in the map\n processVariableAndFallback(valueProperty, (prefix, value) => {\n if (value && this._map.get(value)) {\n valueMixin = `@apply ${value};`\n }\n });\n }\n if (!valueMixin) {\n return matchText;\n }\n let mixinAsProperties = this._consumeCssProperties('' + valueMixin, rule);\n let prefix = matchText.slice(0, matchText.indexOf('--'));\n // `initial` and `inherit` as properties in a map should be replaced because\n // these keywords are eagerly evaluated when the mixin becomes CSS Custom Properties,\n // and would set the variable value, rather than carry the keyword to the `var()` usage.\n let mixinValues = this._cssTextToMap(mixinAsProperties, true);\n let combinedProps = mixinValues;\n let mixinEntry = this._map.get(propertyName);\n let oldProps = mixinEntry && mixinEntry.properties;\n if (oldProps) {\n // NOTE: since we use mixin, the map of properties is updated here\n // and this is what we want.\n combinedProps = Object.assign(Object.create(oldProps), mixinValues);\n } else {\n this._map.set(propertyName, combinedProps);\n }\n let out = [];\n let p, v;\n // set variables defined by current mixin\n let needToInvalidate = false;\n for (p in combinedProps) {\n v = mixinValues[p];\n // if property not defined by current mixin, set initial\n if (v === undefined) {\n v = 'initial';\n }\n if (oldProps && !(p in oldProps)) {\n needToInvalidate = true;\n }\n out.push(`${propertyName}${MIXIN_VAR_SEP}${p}: ${v}`);\n }\n if (needToInvalidate) {\n this._invalidateMixinEntry(mixinEntry);\n }\n if (mixinEntry) {\n mixinEntry.properties = combinedProps;\n }\n // because the mixinMap is global, the mixin might conflict with\n // a different scope's simple variable definition:\n // Example:\n // some style somewhere:\n // --mixin1:{ ... }\n // --mixin2: var(--mixin1);\n // some other element:\n // --mixin1: 10px solid red;\n // --foo: var(--mixin1);\n // In this case, we leave the original variable definition in place.\n if (valueProperty) {\n prefix = `${matchText};${prefix}`;\n }\n return `${prefix}${out.join('; ')};`;\n }\n}\n\n/* exports */\n/* eslint-disable no-self-assign */\nApplyShim.prototype['detectMixin'] = ApplyShim.prototype.detectMixin;\nApplyShim.prototype['transformStyle'] = ApplyShim.prototype.transformStyle;\nApplyShim.prototype['transformCustomStyle'] = ApplyShim.prototype.transformCustomStyle;\nApplyShim.prototype['transformRules'] = ApplyShim.prototype.transformRules;\nApplyShim.prototype['transformRule'] = ApplyShim.prototype.transformRule;\nApplyShim.prototype['transformTemplate'] = ApplyShim.prototype.transformTemplate;\nApplyShim.prototype['_separator'] = MIXIN_VAR_SEP;\n/* eslint-enable no-self-assign */\nObject.defineProperty(ApplyShim.prototype, 'invalidCallback', {\n /** @return {?function(string)} */\n get() {\n return invalidCallback;\n },\n /** @param {?function(string)} cb */\n set(cb) {\n invalidCallback = cb;\n }\n});\n\nexport default ApplyShim;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport { MIXIN_MATCH, VAR_ASSIGN } from './common-regex.js';\n\n/**\n * @param {Element} element\n * @param {Object=} properties\n */\nexport function updateNativeProperties(element, properties) {\n // remove previous properties\n for (let p in properties) {\n // NOTE: for bc with shim, don't apply null values.\n if (p === null) {\n element.style.removeProperty(p);\n } else {\n element.style.setProperty(p, properties[p]);\n }\n }\n}\n\n/**\n * @param {Element} element\n * @param {string} property\n * @return {string}\n */\nexport function getComputedStyleValue(element, property) {\n /**\n * @const {string}\n */\n const value = window.getComputedStyle(element).getPropertyValue(property);\n if (!value) {\n return '';\n } else {\n return value.trim();\n }\n}\n\n/**\n * return true if `cssText` contains a mixin definition or consumption\n * @param {string} cssText\n * @return {boolean}\n */\nexport function detectMixin(cssText) {\n const has = MIXIN_MATCH.test(cssText) || VAR_ASSIGN.test(cssText);\n // reset state of the regexes\n MIXIN_MATCH.lastIndex = 0;\n VAR_ASSIGN.lastIndex = 0;\n return has;\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\n/**\n * @const {!Object<string, !HTMLTemplateElement>}\n */\nconst templateMap = {};\nexport default templateMap;\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\nimport templateMap from './template-map.js';\nimport {StyleNode} from './css-parse.js'; // eslint-disable-line no-unused-vars\n\n/*\n * Utilities for handling invalidating apply-shim mixins for a given template.\n *\n * The invalidation strategy involves keeping track of the \"current\" version of a template's mixins, and updating that count when a mixin is invalidated.\n * The template\n */\n\n/** @const {string} */\nconst CURRENT_VERSION = '_applyShimCurrentVersion';\n\n/** @const {string} */\nconst NEXT_VERSION = '_applyShimNextVersion';\n\n/** @const {string} */\nconst VALIDATING_VERSION = '_applyShimValidatingVersion';\n\n/**\n * @const {Promise<void>}\n */\nconst promise = Promise.resolve();\n\n/**\n * @param {string} elementName\n */\nexport function invalidate(elementName){\n let template = templateMap[elementName];\n if (template) {\n invalidateTemplate(template);\n }\n}\n\n/**\n * This function can be called multiple times to mark a template invalid\n * and signal that the style inside must be regenerated.\n *\n * Use `startValidatingTemplate` to begin an asynchronous validation cycle.\n * During that cycle, call `templateIsValidating` to see if the template must\n * be revalidated\n * @param {HTMLTemplateElement} template\n */\nexport function invalidateTemplate(template) {\n // default the current version to 0\n template[CURRENT_VERSION] = template[CURRENT_VERSION] || 0;\n // ensure the \"validating for\" flag exists\n template[VALIDATING_VERSION] = template[VALIDATING_VERSION] || 0;\n // increment the next version\n template[NEXT_VERSION] = (template[NEXT_VERSION] || 0) + 1;\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValid(elementName) {\n let template = templateMap[elementName];\n if (template) {\n return templateIsValid(template);\n }\n return true;\n}\n\n/**\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValid(template) {\n return template[CURRENT_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * @param {string} elementName\n * @return {boolean}\n */\nexport function isValidating(elementName) {\n let template = templateMap[elementName];\n if (template) {\n return templateIsValidating(template);\n }\n return false;\n}\n\n/**\n * Returns true if the template is currently invalid and `startValidating` has been called since the last invalidation.\n * If false, the template must be validated.\n * @param {HTMLTemplateElement} template\n * @return {boolean}\n */\nexport function templateIsValidating(template) {\n return !templateIsValid(template) && template[VALIDATING_VERSION] === template[NEXT_VERSION];\n}\n\n/**\n * the template is marked as `validating` for one microtask so that all instances\n * found in the tree crawl of `applyStyle` will update themselves,\n * but the template will only be updated once.\n * @param {string} elementName\n*/\nexport function startValidating(elementName) {\n let template = templateMap[elementName];\n startValidatingTemplate(template);\n}\n\n/**\n * Begin an asynchronous invalidation cycle.\n * This should be called after every validation of a template\n *\n * After one microtask, the template will be marked as valid until the next call to `invalidateTemplate`\n * @param {HTMLTemplateElement} template\n */\nexport function startValidatingTemplate(template) {\n // remember that the current \"next version\" is the reason for this validation cycle\n template[VALIDATING_VERSION] = template[NEXT_VERSION];\n // however, there only needs to be one async task to clear the counters\n if (!template._validating) {\n template._validating = true;\n promise.then(function() {\n // sync the current version to let future invalidations cause a refresh cycle\n template[CURRENT_VERSION] = template[NEXT_VERSION];\n template._validating = false;\n });\n }\n}\n\n/**\n * @return {boolean}\n */\nexport function elementsAreInvalid() {\n for (let elementName in templateMap) {\n let template = templateMap[elementName];\n if (!templateIsValid(template)) {\n return true;\n }\n }\n return false;\n}\n","/**\n@license\nCopyright (c) 2017 The Polymer Project Authors. All rights reserved.\nThis code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt\nThe complete set of authors may be found at http://polymer.github.io/AUTHORS.txt\nThe complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt\nCode distributed by Google as part of the polymer project is also\nsubject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt\n*/\n\n'use strict';\n\nimport ApplyShim from '../src/apply-shim.js';\nimport templateMap from '../src/template-map.js';\nimport {getIsExtends, toCssText, elementHasBuiltCss} from '../src/style-util.js';\nimport * as ApplyShimUtils from '../src/apply-shim-utils.js';\nimport {getComputedStyleValue, updateNativeProperties} from '../src/common-utils.js';\nimport {CustomStyleInterfaceInterface} from '../src/custom-style-interface.js'; // eslint-disable-line no-unused-vars\nimport {nativeCssVariables, nativeShadow, cssBuild} from '../src/style-settings.js';\n\n/** @const {ApplyShim} */\nconst applyShim = new ApplyShim();\n\nclass ApplyShimInterface {\n constructor() {\n /** @type {?CustomStyleInterfaceInterface} */\n this.customStyleInterface = null;\n applyShim['invalidCallback'] = ApplyShimUtils.invalidate;\n }\n ensure() {\n if (this.customStyleInterface) {\n return;\n }\n if (window.ShadyCSS.CustomStyleInterface) {\n this.customStyleInterface =\n /** @type {!CustomStyleInterfaceInterface} */ (\n window.ShadyCSS.CustomStyleInterface);\n this.customStyleInterface['transformCallback'] = (style) => {\n applyShim.transformCustomStyle(style);\n };\n this.customStyleInterface['validateCallback'] = () => {\n requestAnimationFrame(() => {\n if (this.customStyleInterface['enqueued']) {\n this.flushCustomStyles();\n }\n });\n }\n }\n }\n /**\n * @param {!HTMLTemplateElement} template\n * @param {string} elementName\n */\n prepareTemplate(template, elementName) {\n this.ensure();\n if (elementHasBuiltCss(template)) {\n return;\n }\n templateMap[elementName] = template;\n let ast = applyShim.transformTemplate(template, elementName);\n // save original style ast to use for revalidating instances\n template['_styleAst'] = ast;\n }\n flushCustomStyles() {\n this.ensure();\n if (!this.customStyleInterface) {\n return;\n }\n let styles = this.customStyleInterface['processStyles']();\n if (!this.customStyleInterface['enqueued']) {\n return;\n }\n for (let i = 0; i < styles.length; i++ ) {\n let cs = styles[i];\n let style = this.customStyleInterface['getStyleForCustomStyle'](cs);\n if (style) {\n applyShim.transformCustomStyle(style);\n }\n }\n this.customStyleInterface['enqueued'] = false;\n }\n /**\n * @param {HTMLElement} element\n * @param {Object=} properties\n */\n styleSubtree(element, properties) {\n this.ensure();\n if (properties) {\n updateNativeProperties(element, properties);\n }\n if (element.shadowRoot) {\n this.styleElement(element);\n let shadowChildren =\n /** @type {!ParentNode} */ (element.shadowRoot).children ||\n element.shadowRoot.childNodes;\n for (let i = 0; i < shadowChildren.length; i++) {\n this.styleSubtree(/** @type {HTMLElement} */(shadowChildren[i]));\n }\n } else {\n let children = element.children || element.childNodes;\n for (let i = 0; i < children.length; i++) {\n this.styleSubtree(/** @type {HTMLElement} */(children[i]));\n }\n }\n }\n /**\n * @param {HTMLElement} element\n */\n styleElement(element) {\n this.ensure();\n let {is} = getIsExtends(element);\n let template = templateMap[is];\n if (template && elementHasBuiltCss(template)) {\n return;\n }\n if (template && !ApplyShimUtils.templateIsValid(template)) {\n // only revalidate template once\n if (!ApplyShimUtils.templateIsValidating(template)) {\n this.prepareTemplate(template, is);\n ApplyShimUtils.startValidatingTemplate(template);\n }\n // update this element instance\n let root = element.shadowRoot;\n if (root) {\n let style = /** @type {HTMLStyleElement} */(root.querySelector('style'));\n if (style) {\n // reuse the template's style ast, it has all the original css text\n style['__cssRules'] = template['_styleAst'];\n style.textContent = toCssText(template['_styleAst'])\n }\n }\n }\n }\n /**\n * @param {Object=} properties\n */\n styleDocument(properties) {\n this.ensure();\n this.styleSubtree(document.body, properties);\n }\n}\n\nif (!window.ShadyCSS || !window.ShadyCSS.ScopingShim) {\n const applyShimInterface = new ApplyShimInterface();\n let CustomStyleInterface = window.ShadyCSS && window.ShadyCSS.CustomStyleInterface;\n\n /** @suppress {duplicate} */\n window.ShadyCSS = {\n /**\n * @param {!HTMLTemplateElement} template\n * @param {string} elementName\n * @param {string=} elementExtends\n */\n prepareTemplate(template, elementName, elementExtends) { // eslint-disable-line no-unused-vars\n applyShimInterface.flushCustomStyles();\n applyShimInterface.prepareTemplate(template, elementName);\n },\n\n /**\n * @param {!HTMLTemplateElement} template\n * @param {string} elementName\n * @param {string=} elementExtends\n */\n prepareTemplateStyles(template, elementName, elementExtends) {\n window.ShadyCSS.prepareTemplate(template, elementName, elementExtends);\n },\n\n /**\n * @param {!HTMLTemplateElement} template\n * @param {string} elementName\n */\n prepareTemplateDom(template, elementName) {}, // eslint-disable-line no-unused-vars\n\n /**\n * @param {!HTMLElement} element\n * @param {Object=} properties\n */\n styleSubtree(element, properties) {\n applyShimInterface.flushCustomStyles();\n applyShimInterface.styleSubtree(element, properties);\n },\n\n /**\n * @param {!HTMLElement} element\n */\n styleElement(element) {\n applyShimInterface.flushCustomStyles();\n applyShimInterface.styleElement(element);\n },\n\n /**\n * @param {Object=} properties\n */\n styleDocument(properties) {\n applyShimInterface.flushCustomStyles();\n applyShimInterface.styleDocument(properties);\n },\n\n /**\n * @param {Element} element\n * @param {string} property\n * @return {string}\n */\n getComputedStyleValue(element, property) {\n return getComputedStyleValue(element, property);\n },\n\n flushCustomStyles() {\n applyShimInterface.flushCustomStyles();\n },\n\n nativeCss: nativeCssVariables,\n nativeShadow: nativeShadow,\n cssBuild: cssBuild\n };\n\n if (CustomStyleInterface) {\n window.ShadyCSS.CustomStyleInterface = CustomStyleInterface;\n }\n}\n\nwindow.ShadyCSS.ApplyShim = applyShim;\n"]}