source: trip-planner-front/node_modules/@angular/compiler/esm2015/src/shadow_css.js@ 6a3a178

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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8/**
9 * This file is a port of shadowCSS from webcomponents.js to TypeScript.
10 *
11 * Please make sure to keep to edits in sync with the source file.
12 *
13 * Source:
14 * https://github.com/webcomponents/webcomponentsjs/blob/4efecd7e0e/src/ShadowCSS/ShadowCSS.js
15 *
16 * The original file level comment is reproduced below
17 */
18/*
19 This is a limited shim for ShadowDOM css styling.
20 https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles
21
22 The intention here is to support only the styling features which can be
23 relatively simply implemented. The goal is to allow users to avoid the
24 most obvious pitfalls and do so without compromising performance significantly.
25 For ShadowDOM styling that's not covered here, a set of best practices
26 can be provided that should allow users to accomplish more complex styling.
27
28 The following is a list of specific ShadowDOM styling features and a brief
29 discussion of the approach used to shim.
30
31 Shimmed features:
32
33 * :host, :host-context: ShadowDOM allows styling of the shadowRoot's host
34 element using the :host rule. To shim this feature, the :host styles are
35 reformatted and prefixed with a given scope name and promoted to a
36 document level stylesheet.
37 For example, given a scope name of .foo, a rule like this:
38
39 :host {
40 background: red;
41 }
42 }
43
44 becomes:
45
46 .foo {
47 background: red;
48 }
49
50 * encapsulation: Styles defined within ShadowDOM, apply only to
51 dom inside the ShadowDOM. Polymer uses one of two techniques to implement
52 this feature.
53
54 By default, rules are prefixed with the host element tag name
55 as a descendant selector. This ensures styling does not leak out of the 'top'
56 of the element's ShadowDOM. For example,
57
58 div {
59 font-weight: bold;
60 }
61
62 becomes:
63
64 x-foo div {
65 font-weight: bold;
66 }
67
68 becomes:
69
70
71 Alternatively, if WebComponents.ShadowCSS.strictStyling is set to true then
72 selectors are scoped by adding an attribute selector suffix to each
73 simple selector that contains the host element tag name. Each element
74 in the element's ShadowDOM template is also given the scope attribute.
75 Thus, these rules match only elements that have the scope attribute.
76 For example, given a scope name of x-foo, a rule like this:
77
78 div {
79 font-weight: bold;
80 }
81
82 becomes:
83
84 div[x-foo] {
85 font-weight: bold;
86 }
87
88 Note that elements that are dynamically added to a scope must have the scope
89 selector added to them manually.
90
91 * upper/lower bound encapsulation: Styles which are defined outside a
92 shadowRoot should not cross the ShadowDOM boundary and should not apply
93 inside a shadowRoot.
94
95 This styling behavior is not emulated. Some possible ways to do this that
96 were rejected due to complexity and/or performance concerns include: (1) reset
97 every possible property for every possible selector for a given scope name;
98 (2) re-implement css in javascript.
99
100 As an alternative, users should make sure to use selectors
101 specific to the scope in which they are working.
102
103 * ::distributed: This behavior is not emulated. It's often not necessary
104 to style the contents of a specific insertion point and instead, descendants
105 of the host element can be styled selectively. Users can also create an
106 extra node around an insertion point and style that node's contents
107 via descendent selectors. For example, with a shadowRoot like this:
108
109 <style>
110 ::content(div) {
111 background: red;
112 }
113 </style>
114 <content></content>
115
116 could become:
117
118 <style>
119 / *@polyfill .content-container div * /
120 ::content(div) {
121 background: red;
122 }
123 </style>
124 <div class="content-container">
125 <content></content>
126 </div>
127
128 Note the use of @polyfill in the comment above a ShadowDOM specific style
129 declaration. This is a directive to the styling shim to use the selector
130 in comments in lieu of the next selector when running under polyfill.
131*/
132export class ShadowCss {
133 constructor() {
134 this.strictStyling = true;
135 }
136 /*
137 * Shim some cssText with the given selector. Returns cssText that can
138 * be included in the document via WebComponents.ShadowCSS.addCssToDocument(css).
139 *
140 * When strictStyling is true:
141 * - selector is the attribute added to all elements inside the host,
142 * - hostSelector is the attribute added to the host itself.
143 */
144 shimCssText(cssText, selector, hostSelector = '') {
145 const commentsWithHash = extractCommentsWithHash(cssText);
146 cssText = stripComments(cssText);
147 cssText = this._insertDirectives(cssText);
148 const scopedCssText = this._scopeCssText(cssText, selector, hostSelector);
149 return [scopedCssText, ...commentsWithHash].join('\n');
150 }
151 _insertDirectives(cssText) {
152 cssText = this._insertPolyfillDirectivesInCssText(cssText);
153 return this._insertPolyfillRulesInCssText(cssText);
154 }
155 /*
156 * Process styles to convert native ShadowDOM rules that will trip
157 * up the css parser; we rely on decorating the stylesheet with inert rules.
158 *
159 * For example, we convert this rule:
160 *
161 * polyfill-next-selector { content: ':host menu-item'; }
162 * ::content menu-item {
163 *
164 * to this:
165 *
166 * scopeName menu-item {
167 *
168 **/
169 _insertPolyfillDirectivesInCssText(cssText) {
170 // Difference with webcomponents.js: does not handle comments
171 return cssText.replace(_cssContentNextSelectorRe, function (...m) {
172 return m[2] + '{';
173 });
174 }
175 /*
176 * Process styles to add rules which will only apply under the polyfill
177 *
178 * For example, we convert this rule:
179 *
180 * polyfill-rule {
181 * content: ':host menu-item';
182 * ...
183 * }
184 *
185 * to this:
186 *
187 * scopeName menu-item {...}
188 *
189 **/
190 _insertPolyfillRulesInCssText(cssText) {
191 // Difference with webcomponents.js: does not handle comments
192 return cssText.replace(_cssContentRuleRe, (...m) => {
193 const rule = m[0].replace(m[1], '').replace(m[2], '');
194 return m[4] + rule;
195 });
196 }
197 /* Ensure styles are scoped. Pseudo-scoping takes a rule like:
198 *
199 * .foo {... }
200 *
201 * and converts this to
202 *
203 * scopeName .foo { ... }
204 */
205 _scopeCssText(cssText, scopeSelector, hostSelector) {
206 const unscopedRules = this._extractUnscopedRulesFromCssText(cssText);
207 // replace :host and :host-context -shadowcsshost and -shadowcsshost respectively
208 cssText = this._insertPolyfillHostInCssText(cssText);
209 cssText = this._convertColonHost(cssText);
210 cssText = this._convertColonHostContext(cssText);
211 cssText = this._convertShadowDOMSelectors(cssText);
212 if (scopeSelector) {
213 cssText = this._scopeSelectors(cssText, scopeSelector, hostSelector);
214 }
215 cssText = cssText + '\n' + unscopedRules;
216 return cssText.trim();
217 }
218 /*
219 * Process styles to add rules which will only apply under the polyfill
220 * and do not process via CSSOM. (CSSOM is destructive to rules on rare
221 * occasions, e.g. -webkit-calc on Safari.)
222 * For example, we convert this rule:
223 *
224 * @polyfill-unscoped-rule {
225 * content: 'menu-item';
226 * ... }
227 *
228 * to this:
229 *
230 * menu-item {...}
231 *
232 **/
233 _extractUnscopedRulesFromCssText(cssText) {
234 // Difference with webcomponents.js: does not handle comments
235 let r = '';
236 let m;
237 _cssContentUnscopedRuleRe.lastIndex = 0;
238 while ((m = _cssContentUnscopedRuleRe.exec(cssText)) !== null) {
239 const rule = m[0].replace(m[2], '').replace(m[1], m[4]);
240 r += rule + '\n\n';
241 }
242 return r;
243 }
244 /*
245 * convert a rule like :host(.foo) > .bar { }
246 *
247 * to
248 *
249 * .foo<scopeName> > .bar
250 */
251 _convertColonHost(cssText) {
252 return cssText.replace(_cssColonHostRe, (_, hostSelectors, otherSelectors) => {
253 if (hostSelectors) {
254 const convertedSelectors = [];
255 const hostSelectorArray = hostSelectors.split(',').map(p => p.trim());
256 for (const hostSelector of hostSelectorArray) {
257 if (!hostSelector)
258 break;
259 const convertedSelector = _polyfillHostNoCombinator + hostSelector.replace(_polyfillHost, '') + otherSelectors;
260 convertedSelectors.push(convertedSelector);
261 }
262 return convertedSelectors.join(',');
263 }
264 else {
265 return _polyfillHostNoCombinator + otherSelectors;
266 }
267 });
268 }
269 /*
270 * convert a rule like :host-context(.foo) > .bar { }
271 *
272 * to
273 *
274 * .foo<scopeName> > .bar, .foo <scopeName> > .bar { }
275 *
276 * and
277 *
278 * :host-context(.foo:host) .bar { ... }
279 *
280 * to
281 *
282 * .foo<scopeName> .bar { ... }
283 */
284 _convertColonHostContext(cssText) {
285 return cssText.replace(_cssColonHostContextReGlobal, selectorText => {
286 // We have captured a selector that contains a `:host-context` rule.
287 var _a;
288 // For backward compatibility `:host-context` may contain a comma separated list of selectors.
289 // Each context selector group will contain a list of host-context selectors that must match
290 // an ancestor of the host.
291 // (Normally `contextSelectorGroups` will only contain a single array of context selectors.)
292 const contextSelectorGroups = [[]];
293 // There may be more than `:host-context` in this selector so `selectorText` could look like:
294 // `:host-context(.one):host-context(.two)`.
295 // Execute `_cssColonHostContextRe` over and over until we have extracted all the
296 // `:host-context` selectors from this selector.
297 let match;
298 while (match = _cssColonHostContextRe.exec(selectorText)) {
299 // `match` = [':host-context(<selectors>)<rest>', <selectors>, <rest>]
300 // The `<selectors>` could actually be a comma separated list: `:host-context(.one, .two)`.
301 const newContextSelectors = ((_a = match[1]) !== null && _a !== void 0 ? _a : '').trim().split(',').map(m => m.trim()).filter(m => m !== '');
302 // We must duplicate the current selector group for each of these new selectors.
303 // For example if the current groups are:
304 // ```
305 // [
306 // ['a', 'b', 'c'],
307 // ['x', 'y', 'z'],
308 // ]
309 // ```
310 // And we have a new set of comma separated selectors: `:host-context(m,n)` then the new
311 // groups are:
312 // ```
313 // [
314 // ['a', 'b', 'c', 'm'],
315 // ['x', 'y', 'z', 'm'],
316 // ['a', 'b', 'c', 'n'],
317 // ['x', 'y', 'z', 'n'],
318 // ]
319 // ```
320 const contextSelectorGroupsLength = contextSelectorGroups.length;
321 repeatGroups(contextSelectorGroups, newContextSelectors.length);
322 for (let i = 0; i < newContextSelectors.length; i++) {
323 for (let j = 0; j < contextSelectorGroupsLength; j++) {
324 contextSelectorGroups[j + (i * contextSelectorGroupsLength)].push(newContextSelectors[i]);
325 }
326 }
327 // Update the `selectorText` and see repeat to see if there are more `:host-context`s.
328 selectorText = match[2];
329 }
330 // The context selectors now must be combined with each other to capture all the possible
331 // selectors that `:host-context` can match. See `combineHostContextSelectors()` for more
332 // info about how this is done.
333 return contextSelectorGroups
334 .map(contextSelectors => combineHostContextSelectors(contextSelectors, selectorText))
335 .join(', ');
336 });
337 }
338 /*
339 * Convert combinators like ::shadow and pseudo-elements like ::content
340 * by replacing with space.
341 */
342 _convertShadowDOMSelectors(cssText) {
343 return _shadowDOMSelectorsRe.reduce((result, pattern) => result.replace(pattern, ' '), cssText);
344 }
345 // change a selector like 'div' to 'name div'
346 _scopeSelectors(cssText, scopeSelector, hostSelector) {
347 return processRules(cssText, (rule) => {
348 let selector = rule.selector;
349 let content = rule.content;
350 if (rule.selector[0] !== '@') {
351 selector =
352 this._scopeSelector(rule.selector, scopeSelector, hostSelector, this.strictStyling);
353 }
354 else if (rule.selector.startsWith('@media') || rule.selector.startsWith('@supports') ||
355 rule.selector.startsWith('@document')) {
356 content = this._scopeSelectors(rule.content, scopeSelector, hostSelector);
357 }
358 else if (rule.selector.startsWith('@font-face') || rule.selector.startsWith('@page')) {
359 content = this._stripScopingSelectors(rule.content);
360 }
361 return new CssRule(selector, content);
362 });
363 }
364 /**
365 * Handle a css text that is within a rule that should not contain scope selectors by simply
366 * removing them! An example of such a rule is `@font-face`.
367 *
368 * `@font-face` rules cannot contain nested selectors. Nor can they be nested under a selector.
369 * Normally this would be a syntax error by the author of the styles. But in some rare cases, such
370 * as importing styles from a library, and applying `:host ::ng-deep` to the imported styles, we
371 * can end up with broken css if the imported styles happen to contain @font-face rules.
372 *
373 * For example:
374 *
375 * ```
376 * :host ::ng-deep {
377 * import 'some/lib/containing/font-face';
378 * }
379 *
380 * Similar logic applies to `@page` rules which can contain a particular set of properties,
381 * as well as some specific at-rules. Since they can't be encapsulated, we have to strip
382 * any scoping selectors from them. For more information: https://www.w3.org/TR/css-page-3
383 * ```
384 */
385 _stripScopingSelectors(cssText) {
386 return processRules(cssText, rule => {
387 const selector = rule.selector.replace(_shadowDeepSelectors, ' ')
388 .replace(_polyfillHostNoCombinatorRe, ' ');
389 return new CssRule(selector, rule.content);
390 });
391 }
392 _scopeSelector(selector, scopeSelector, hostSelector, strict) {
393 return selector.split(',')
394 .map(part => part.trim().split(_shadowDeepSelectors))
395 .map((deepParts) => {
396 const [shallowPart, ...otherParts] = deepParts;
397 const applyScope = (shallowPart) => {
398 if (this._selectorNeedsScoping(shallowPart, scopeSelector)) {
399 return strict ?
400 this._applyStrictSelectorScope(shallowPart, scopeSelector, hostSelector) :
401 this._applySelectorScope(shallowPart, scopeSelector, hostSelector);
402 }
403 else {
404 return shallowPart;
405 }
406 };
407 return [applyScope(shallowPart), ...otherParts].join(' ');
408 })
409 .join(', ');
410 }
411 _selectorNeedsScoping(selector, scopeSelector) {
412 const re = this._makeScopeMatcher(scopeSelector);
413 return !re.test(selector);
414 }
415 _makeScopeMatcher(scopeSelector) {
416 const lre = /\[/g;
417 const rre = /\]/g;
418 scopeSelector = scopeSelector.replace(lre, '\\[').replace(rre, '\\]');
419 return new RegExp('^(' + scopeSelector + ')' + _selectorReSuffix, 'm');
420 }
421 _applySelectorScope(selector, scopeSelector, hostSelector) {
422 // Difference from webcomponents.js: scopeSelector could not be an array
423 return this._applySimpleSelectorScope(selector, scopeSelector, hostSelector);
424 }
425 // scope via name and [is=name]
426 _applySimpleSelectorScope(selector, scopeSelector, hostSelector) {
427 // In Android browser, the lastIndex is not reset when the regex is used in String.replace()
428 _polyfillHostRe.lastIndex = 0;
429 if (_polyfillHostRe.test(selector)) {
430 const replaceBy = this.strictStyling ? `[${hostSelector}]` : scopeSelector;
431 return selector
432 .replace(_polyfillHostNoCombinatorRe, (hnc, selector) => {
433 return selector.replace(/([^:]*)(:*)(.*)/, (_, before, colon, after) => {
434 return before + replaceBy + colon + after;
435 });
436 })
437 .replace(_polyfillHostRe, replaceBy + ' ');
438 }
439 return scopeSelector + ' ' + selector;
440 }
441 // return a selector with [name] suffix on each simple selector
442 // e.g. .foo.bar > .zot becomes .foo[name].bar[name] > .zot[name] /** @internal */
443 _applyStrictSelectorScope(selector, scopeSelector, hostSelector) {
444 const isRe = /\[is=([^\]]*)\]/g;
445 scopeSelector = scopeSelector.replace(isRe, (_, ...parts) => parts[0]);
446 const attrName = '[' + scopeSelector + ']';
447 const _scopeSelectorPart = (p) => {
448 let scopedP = p.trim();
449 if (!scopedP) {
450 return '';
451 }
452 if (p.indexOf(_polyfillHostNoCombinator) > -1) {
453 scopedP = this._applySimpleSelectorScope(p, scopeSelector, hostSelector);
454 }
455 else {
456 // remove :host since it should be unnecessary
457 const t = p.replace(_polyfillHostRe, '');
458 if (t.length > 0) {
459 const matches = t.match(/([^:]*)(:*)(.*)/);
460 if (matches) {
461 scopedP = matches[1] + attrName + matches[2] + matches[3];
462 }
463 }
464 }
465 return scopedP;
466 };
467 const safeContent = new SafeSelector(selector);
468 selector = safeContent.content();
469 let scopedSelector = '';
470 let startIndex = 0;
471 let res;
472 const sep = /( |>|\+|~(?!=))\s*/g;
473 // If a selector appears before :host it should not be shimmed as it
474 // matches on ancestor elements and not on elements in the host's shadow
475 // `:host-context(div)` is transformed to
476 // `-shadowcsshost-no-combinatordiv, div -shadowcsshost-no-combinator`
477 // the `div` is not part of the component in the 2nd selectors and should not be scoped.
478 // Historically `component-tag:host` was matching the component so we also want to preserve
479 // this behavior to avoid breaking legacy apps (it should not match).
480 // The behavior should be:
481 // - `tag:host` -> `tag[h]` (this is to avoid breaking legacy apps, should not match anything)
482 // - `tag :host` -> `tag [h]` (`tag` is not scoped because it's considered part of a
483 // `:host-context(tag)`)
484 const hasHost = selector.indexOf(_polyfillHostNoCombinator) > -1;
485 // Only scope parts after the first `-shadowcsshost-no-combinator` when it is present
486 let shouldScope = !hasHost;
487 while ((res = sep.exec(selector)) !== null) {
488 const separator = res[1];
489 const part = selector.slice(startIndex, res.index).trim();
490 shouldScope = shouldScope || part.indexOf(_polyfillHostNoCombinator) > -1;
491 const scopedPart = shouldScope ? _scopeSelectorPart(part) : part;
492 scopedSelector += `${scopedPart} ${separator} `;
493 startIndex = sep.lastIndex;
494 }
495 const part = selector.substring(startIndex);
496 shouldScope = shouldScope || part.indexOf(_polyfillHostNoCombinator) > -1;
497 scopedSelector += shouldScope ? _scopeSelectorPart(part) : part;
498 // replace the placeholders with their original values
499 return safeContent.restore(scopedSelector);
500 }
501 _insertPolyfillHostInCssText(selector) {
502 return selector.replace(_colonHostContextRe, _polyfillHostContext)
503 .replace(_colonHostRe, _polyfillHost);
504 }
505}
506class SafeSelector {
507 constructor(selector) {
508 this.placeholders = [];
509 this.index = 0;
510 // Replaces attribute selectors with placeholders.
511 // The WS in [attr="va lue"] would otherwise be interpreted as a selector separator.
512 selector = this._escapeRegexMatches(selector, /(\[[^\]]*\])/g);
513 // CSS allows for certain special characters to be used in selectors if they're escaped.
514 // E.g. `.foo:blue` won't match a class called `foo:blue`, because the colon denotes a
515 // pseudo-class, but writing `.foo\:blue` will match, because the colon was escaped.
516 // Replace all escape sequences (`\` followed by a character) with a placeholder so
517 // that our handling of pseudo-selectors doesn't mess with them.
518 selector = this._escapeRegexMatches(selector, /(\\.)/g);
519 // Replaces the expression in `:nth-child(2n + 1)` with a placeholder.
520 // WS and "+" would otherwise be interpreted as selector separators.
521 this._content = selector.replace(/(:nth-[-\w]+)(\([^)]+\))/g, (_, pseudo, exp) => {
522 const replaceBy = `__ph-${this.index}__`;
523 this.placeholders.push(exp);
524 this.index++;
525 return pseudo + replaceBy;
526 });
527 }
528 restore(content) {
529 return content.replace(/__ph-(\d+)__/g, (_ph, index) => this.placeholders[+index]);
530 }
531 content() {
532 return this._content;
533 }
534 /**
535 * Replaces all of the substrings that match a regex within a
536 * special string (e.g. `__ph-0__`, `__ph-1__`, etc).
537 */
538 _escapeRegexMatches(content, pattern) {
539 return content.replace(pattern, (_, keep) => {
540 const replaceBy = `__ph-${this.index}__`;
541 this.placeholders.push(keep);
542 this.index++;
543 return replaceBy;
544 });
545 }
546}
547const _cssContentNextSelectorRe = /polyfill-next-selector[^}]*content:[\s]*?(['"])(.*?)\1[;\s]*}([^{]*?){/gim;
548const _cssContentRuleRe = /(polyfill-rule)[^}]*(content:[\s]*(['"])(.*?)\3)[;\s]*[^}]*}/gim;
549const _cssContentUnscopedRuleRe = /(polyfill-unscoped-rule)[^}]*(content:[\s]*(['"])(.*?)\3)[;\s]*[^}]*}/gim;
550const _polyfillHost = '-shadowcsshost';
551// note: :host-context pre-processed to -shadowcsshostcontext.
552const _polyfillHostContext = '-shadowcsscontext';
553const _parenSuffix = '(?:\\((' +
554 '(?:\\([^)(]*\\)|[^)(]*)+?' +
555 ')\\))?([^,{]*)';
556const _cssColonHostRe = new RegExp(_polyfillHost + _parenSuffix, 'gim');
557const _cssColonHostContextReGlobal = new RegExp(_polyfillHostContext + _parenSuffix, 'gim');
558const _cssColonHostContextRe = new RegExp(_polyfillHostContext + _parenSuffix, 'im');
559const _polyfillHostNoCombinator = _polyfillHost + '-no-combinator';
560const _polyfillHostNoCombinatorRe = /-shadowcsshost-no-combinator([^\s]*)/;
561const _shadowDOMSelectorsRe = [
562 /::shadow/g,
563 /::content/g,
564 // Deprecated selectors
565 /\/shadow-deep\//g,
566 /\/shadow\//g,
567];
568// The deep combinator is deprecated in the CSS spec
569// Support for `>>>`, `deep`, `::ng-deep` is then also deprecated and will be removed in the future.
570// see https://github.com/angular/angular/pull/17677
571const _shadowDeepSelectors = /(?:>>>)|(?:\/deep\/)|(?:::ng-deep)/g;
572const _selectorReSuffix = '([>\\s~+[.,{:][\\s\\S]*)?$';
573const _polyfillHostRe = /-shadowcsshost/gim;
574const _colonHostRe = /:host/gim;
575const _colonHostContextRe = /:host-context/gim;
576const _commentRe = /\/\*[\s\S]*?\*\//g;
577function stripComments(input) {
578 return input.replace(_commentRe, '');
579}
580const _commentWithHashRe = /\/\*\s*#\s*source(Mapping)?URL=[\s\S]+?\*\//g;
581function extractCommentsWithHash(input) {
582 return input.match(_commentWithHashRe) || [];
583}
584const BLOCK_PLACEHOLDER = '%BLOCK%';
585const QUOTE_PLACEHOLDER = '%QUOTED%';
586const _ruleRe = /(\s*)([^;\{\}]+?)(\s*)((?:{%BLOCK%}?\s*;?)|(?:\s*;))/g;
587const _quotedRe = /%QUOTED%/g;
588const CONTENT_PAIRS = new Map([['{', '}']]);
589const QUOTE_PAIRS = new Map([[`"`, `"`], [`'`, `'`]]);
590export class CssRule {
591 constructor(selector, content) {
592 this.selector = selector;
593 this.content = content;
594 }
595}
596export function processRules(input, ruleCallback) {
597 const inputWithEscapedQuotes = escapeBlocks(input, QUOTE_PAIRS, QUOTE_PLACEHOLDER);
598 const inputWithEscapedBlocks = escapeBlocks(inputWithEscapedQuotes.escapedString, CONTENT_PAIRS, BLOCK_PLACEHOLDER);
599 let nextBlockIndex = 0;
600 let nextQuoteIndex = 0;
601 return inputWithEscapedBlocks.escapedString
602 .replace(_ruleRe, (...m) => {
603 const selector = m[2];
604 let content = '';
605 let suffix = m[4];
606 let contentPrefix = '';
607 if (suffix && suffix.startsWith('{' + BLOCK_PLACEHOLDER)) {
608 content = inputWithEscapedBlocks.blocks[nextBlockIndex++];
609 suffix = suffix.substring(BLOCK_PLACEHOLDER.length + 1);
610 contentPrefix = '{';
611 }
612 const rule = ruleCallback(new CssRule(selector, content));
613 return `${m[1]}${rule.selector}${m[3]}${contentPrefix}${rule.content}${suffix}`;
614 })
615 .replace(_quotedRe, () => inputWithEscapedQuotes.blocks[nextQuoteIndex++]);
616}
617class StringWithEscapedBlocks {
618 constructor(escapedString, blocks) {
619 this.escapedString = escapedString;
620 this.blocks = blocks;
621 }
622}
623function escapeBlocks(input, charPairs, placeholder) {
624 const resultParts = [];
625 const escapedBlocks = [];
626 let openCharCount = 0;
627 let nonBlockStartIndex = 0;
628 let blockStartIndex = -1;
629 let openChar;
630 let closeChar;
631 for (let i = 0; i < input.length; i++) {
632 const char = input[i];
633 if (char === '\\') {
634 i++;
635 }
636 else if (char === closeChar) {
637 openCharCount--;
638 if (openCharCount === 0) {
639 escapedBlocks.push(input.substring(blockStartIndex, i));
640 resultParts.push(placeholder);
641 nonBlockStartIndex = i;
642 blockStartIndex = -1;
643 openChar = closeChar = undefined;
644 }
645 }
646 else if (char === openChar) {
647 openCharCount++;
648 }
649 else if (openCharCount === 0 && charPairs.has(char)) {
650 openChar = char;
651 closeChar = charPairs.get(char);
652 openCharCount = 1;
653 blockStartIndex = i + 1;
654 resultParts.push(input.substring(nonBlockStartIndex, blockStartIndex));
655 }
656 }
657 if (blockStartIndex !== -1) {
658 escapedBlocks.push(input.substring(blockStartIndex));
659 resultParts.push(placeholder);
660 }
661 else {
662 resultParts.push(input.substring(nonBlockStartIndex));
663 }
664 return new StringWithEscapedBlocks(resultParts.join(''), escapedBlocks);
665}
666/**
667 * Combine the `contextSelectors` with the `hostMarker` and the `otherSelectors`
668 * to create a selector that matches the same as `:host-context()`.
669 *
670 * Given a single context selector `A` we need to output selectors that match on the host and as an
671 * ancestor of the host:
672 *
673 * ```
674 * A <hostMarker>, A<hostMarker> {}
675 * ```
676 *
677 * When there is more than one context selector we also have to create combinations of those
678 * selectors with each other. For example if there are `A` and `B` selectors the output is:
679 *
680 * ```
681 * AB<hostMarker>, AB <hostMarker>, A B<hostMarker>,
682 * B A<hostMarker>, A B <hostMarker>, B A <hostMarker> {}
683 * ```
684 *
685 * And so on...
686 *
687 * @param hostMarker the string that selects the host element.
688 * @param contextSelectors an array of context selectors that will be combined.
689 * @param otherSelectors the rest of the selectors that are not context selectors.
690 */
691function combineHostContextSelectors(contextSelectors, otherSelectors) {
692 const hostMarker = _polyfillHostNoCombinator;
693 _polyfillHostRe.lastIndex = 0; // reset the regex to ensure we get an accurate test
694 const otherSelectorsHasHost = _polyfillHostRe.test(otherSelectors);
695 // If there are no context selectors then just output a host marker
696 if (contextSelectors.length === 0) {
697 return hostMarker + otherSelectors;
698 }
699 const combined = [contextSelectors.pop() || ''];
700 while (contextSelectors.length > 0) {
701 const length = combined.length;
702 const contextSelector = contextSelectors.pop();
703 for (let i = 0; i < length; i++) {
704 const previousSelectors = combined[i];
705 // Add the new selector as a descendant of the previous selectors
706 combined[length * 2 + i] = previousSelectors + ' ' + contextSelector;
707 // Add the new selector as an ancestor of the previous selectors
708 combined[length + i] = contextSelector + ' ' + previousSelectors;
709 // Add the new selector to act on the same element as the previous selectors
710 combined[i] = contextSelector + previousSelectors;
711 }
712 }
713 // Finally connect the selector to the `hostMarker`s: either acting directly on the host
714 // (A<hostMarker>) or as an ancestor (A <hostMarker>).
715 return combined
716 .map(s => otherSelectorsHasHost ?
717 `${s}${otherSelectors}` :
718 `${s}${hostMarker}${otherSelectors}, ${s} ${hostMarker}${otherSelectors}`)
719 .join(',');
720}
721/**
722 * Mutate the given `groups` array so that there are `multiples` clones of the original array
723 * stored.
724 *
725 * For example `repeatGroups([a, b], 3)` will result in `[a, b, a, b, a, b]` - but importantly the
726 * newly added groups will be clones of the original.
727 *
728 * @param groups An array of groups of strings that will be repeated. This array is mutated
729 * in-place.
730 * @param multiples The number of times the current groups should appear.
731 */
732export function repeatGroups(groups, multiples) {
733 const length = groups.length;
734 for (let i = 1; i < multiples; i++) {
735 for (let j = 0; j < length; j++) {
736 groups[j + (i * length)] = groups[j].slice(0);
737 }
738 }
739}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\n/**\n * This file is a port of shadowCSS from webcomponents.js to TypeScript.\n *\n * Please make sure to keep to edits in sync with the source file.\n *\n * Source:\n * https://github.com/webcomponents/webcomponentsjs/blob/4efecd7e0e/src/ShadowCSS/ShadowCSS.js\n *\n * The original file level comment is reproduced below\n */\n\n/*\n  This is a limited shim for ShadowDOM css styling.\n  https://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#styles\n\n  The intention here is to support only the styling features which can be\n  relatively simply implemented. The goal is to allow users to avoid the\n  most obvious pitfalls and do so without compromising performance significantly.\n  For ShadowDOM styling that's not covered here, a set of best practices\n  can be provided that should allow users to accomplish more complex styling.\n\n  The following is a list of specific ShadowDOM styling features and a brief\n  discussion of the approach used to shim.\n\n  Shimmed features:\n\n  * :host, :host-context: ShadowDOM allows styling of the shadowRoot's host\n  element using the :host rule. To shim this feature, the :host styles are\n  reformatted and prefixed with a given scope name and promoted to a\n  document level stylesheet.\n  For example, given a scope name of .foo, a rule like this:\n\n    :host {\n        background: red;\n      }\n    }\n\n  becomes:\n\n    .foo {\n      background: red;\n    }\n\n  * encapsulation: Styles defined within ShadowDOM, apply only to\n  dom inside the ShadowDOM. Polymer uses one of two techniques to implement\n  this feature.\n\n  By default, rules are prefixed with the host element tag name\n  as a descendant selector. This ensures styling does not leak out of the 'top'\n  of the element's ShadowDOM. For example,\n\n  div {\n      font-weight: bold;\n    }\n\n  becomes:\n\n  x-foo div {\n      font-weight: bold;\n    }\n\n  becomes:\n\n\n  Alternatively, if WebComponents.ShadowCSS.strictStyling is set to true then\n  selectors are scoped by adding an attribute selector suffix to each\n  simple selector that contains the host element tag name. Each element\n  in the element's ShadowDOM template is also given the scope attribute.\n  Thus, these rules match only elements that have the scope attribute.\n  For example, given a scope name of x-foo, a rule like this:\n\n    div {\n      font-weight: bold;\n    }\n\n  becomes:\n\n    div[x-foo] {\n      font-weight: bold;\n    }\n\n  Note that elements that are dynamically added to a scope must have the scope\n  selector added to them manually.\n\n  * upper/lower bound encapsulation: Styles which are defined outside a\n  shadowRoot should not cross the ShadowDOM boundary and should not apply\n  inside a shadowRoot.\n\n  This styling behavior is not emulated. Some possible ways to do this that\n  were rejected due to complexity and/or performance concerns include: (1) reset\n  every possible property for every possible selector for a given scope name;\n  (2) re-implement css in javascript.\n\n  As an alternative, users should make sure to use selectors\n  specific to the scope in which they are working.\n\n  * ::distributed: This behavior is not emulated. It's often not necessary\n  to style the contents of a specific insertion point and instead, descendants\n  of the host element can be styled selectively. Users can also create an\n  extra node around an insertion point and style that node's contents\n  via descendent selectors. For example, with a shadowRoot like this:\n\n    <style>\n      ::content(div) {\n        background: red;\n      }\n    </style>\n    <content></content>\n\n  could become:\n\n    <style>\n      / *@polyfill .content-container div * /\n      ::content(div) {\n        background: red;\n      }\n    </style>\n    <div class=\"content-container\">\n      <content></content>\n    </div>\n\n  Note the use of @polyfill in the comment above a ShadowDOM specific style\n  declaration. This is a directive to the styling shim to use the selector\n  in comments in lieu of the next selector when running under polyfill.\n*/\n\nexport class ShadowCss {\n  strictStyling: boolean = true;\n\n  /*\n   * Shim some cssText with the given selector. Returns cssText that can\n   * be included in the document via WebComponents.ShadowCSS.addCssToDocument(css).\n   *\n   * When strictStyling is true:\n   * - selector is the attribute added to all elements inside the host,\n   * - hostSelector is the attribute added to the host itself.\n   */\n  shimCssText(cssText: string, selector: string, hostSelector: string = ''): string {\n    const commentsWithHash = extractCommentsWithHash(cssText);\n    cssText = stripComments(cssText);\n    cssText = this._insertDirectives(cssText);\n\n    const scopedCssText = this._scopeCssText(cssText, selector, hostSelector);\n    return [scopedCssText, ...commentsWithHash].join('\\n');\n  }\n\n  private _insertDirectives(cssText: string): string {\n    cssText = this._insertPolyfillDirectivesInCssText(cssText);\n    return this._insertPolyfillRulesInCssText(cssText);\n  }\n\n  /*\n   * Process styles to convert native ShadowDOM rules that will trip\n   * up the css parser; we rely on decorating the stylesheet with inert rules.\n   *\n   * For example, we convert this rule:\n   *\n   * polyfill-next-selector { content: ':host menu-item'; }\n   * ::content menu-item {\n   *\n   * to this:\n   *\n   * scopeName menu-item {\n   *\n   **/\n  private _insertPolyfillDirectivesInCssText(cssText: string): string {\n    // Difference with webcomponents.js: does not handle comments\n    return cssText.replace(_cssContentNextSelectorRe, function(...m: string[]) {\n      return m[2] + '{';\n    });\n  }\n\n  /*\n   * Process styles to add rules which will only apply under the polyfill\n   *\n   * For example, we convert this rule:\n   *\n   * polyfill-rule {\n   *   content: ':host menu-item';\n   * ...\n   * }\n   *\n   * to this:\n   *\n   * scopeName menu-item {...}\n   *\n   **/\n  private _insertPolyfillRulesInCssText(cssText: string): string {\n    // Difference with webcomponents.js: does not handle comments\n    return cssText.replace(_cssContentRuleRe, (...m: string[]) => {\n      const rule = m[0].replace(m[1], '').replace(m[2], '');\n      return m[4] + rule;\n    });\n  }\n\n  /* Ensure styles are scoped. Pseudo-scoping takes a rule like:\n   *\n   *  .foo {... }\n   *\n   *  and converts this to\n   *\n   *  scopeName .foo { ... }\n   */\n  private _scopeCssText(cssText: string, scopeSelector: string, hostSelector: string): string {\n    const unscopedRules = this._extractUnscopedRulesFromCssText(cssText);\n    // replace :host and :host-context -shadowcsshost and -shadowcsshost respectively\n    cssText = this._insertPolyfillHostInCssText(cssText);\n    cssText = this._convertColonHost(cssText);\n    cssText = this._convertColonHostContext(cssText);\n    cssText = this._convertShadowDOMSelectors(cssText);\n    if (scopeSelector) {\n      cssText = this._scopeSelectors(cssText, scopeSelector, hostSelector);\n    }\n    cssText = cssText + '\\n' + unscopedRules;\n    return cssText.trim();\n  }\n\n  /*\n   * Process styles to add rules which will only apply under the polyfill\n   * and do not process via CSSOM. (CSSOM is destructive to rules on rare\n   * occasions, e.g. -webkit-calc on Safari.)\n   * For example, we convert this rule:\n   *\n   * @polyfill-unscoped-rule {\n   *   content: 'menu-item';\n   * ... }\n   *\n   * to this:\n   *\n   * menu-item {...}\n   *\n   **/\n  private _extractUnscopedRulesFromCssText(cssText: string): string {\n    // Difference with webcomponents.js: does not handle comments\n    let r = '';\n    let m: RegExpExecArray|null;\n    _cssContentUnscopedRuleRe.lastIndex = 0;\n    while ((m = _cssContentUnscopedRuleRe.exec(cssText)) !== null) {\n      const rule = m[0].replace(m[2], '').replace(m[1], m[4]);\n      r += rule + '\\n\\n';\n    }\n    return r;\n  }\n\n  /*\n   * convert a rule like :host(.foo) > .bar { }\n   *\n   * to\n   *\n   * .foo<scopeName> > .bar\n   */\n  private _convertColonHost(cssText: string): string {\n    return cssText.replace(_cssColonHostRe, (_, hostSelectors: string, otherSelectors: string) => {\n      if (hostSelectors) {\n        const convertedSelectors: string[] = [];\n        const hostSelectorArray = hostSelectors.split(',').map(p => p.trim());\n        for (const hostSelector of hostSelectorArray) {\n          if (!hostSelector) break;\n          const convertedSelector =\n              _polyfillHostNoCombinator + hostSelector.replace(_polyfillHost, '') + otherSelectors;\n          convertedSelectors.push(convertedSelector);\n        }\n        return convertedSelectors.join(',');\n      } else {\n        return _polyfillHostNoCombinator + otherSelectors;\n      }\n    });\n  }\n\n  /*\n   * convert a rule like :host-context(.foo) > .bar { }\n   *\n   * to\n   *\n   * .foo<scopeName> > .bar, .foo <scopeName> > .bar { }\n   *\n   * and\n   *\n   * :host-context(.foo:host) .bar { ... }\n   *\n   * to\n   *\n   * .foo<scopeName> .bar { ... }\n   */\n  private _convertColonHostContext(cssText: string): string {\n    return cssText.replace(_cssColonHostContextReGlobal, selectorText => {\n      // We have captured a selector that contains a `:host-context` rule.\n\n      // For backward compatibility `:host-context` may contain a comma separated list of selectors.\n      // Each context selector group will contain a list of host-context selectors that must match\n      // an ancestor of the host.\n      // (Normally `contextSelectorGroups` will only contain a single array of context selectors.)\n      const contextSelectorGroups: string[][] = [[]];\n\n      // There may be more than `:host-context` in this selector so `selectorText` could look like:\n      // `:host-context(.one):host-context(.two)`.\n      // Execute `_cssColonHostContextRe` over and over until we have extracted all the\n      // `:host-context` selectors from this selector.\n      let match: RegExpMatchArray|null;\n      while (match = _cssColonHostContextRe.exec(selectorText)) {\n        // `match` = [':host-context(<selectors>)<rest>', <selectors>, <rest>]\n\n        // The `<selectors>` could actually be a comma separated list: `:host-context(.one, .two)`.\n        const newContextSelectors =\n            (match[1] ?? '').trim().split(',').map(m => m.trim()).filter(m => m !== '');\n\n        // We must duplicate the current selector group for each of these new selectors.\n        // For example if the current groups are:\n        // ```\n        // [\n        //   ['a', 'b', 'c'],\n        //   ['x', 'y', 'z'],\n        // ]\n        // ```\n        // And we have a new set of comma separated selectors: `:host-context(m,n)` then the new\n        // groups are:\n        // ```\n        // [\n        //   ['a', 'b', 'c', 'm'],\n        //   ['x', 'y', 'z', 'm'],\n        //   ['a', 'b', 'c', 'n'],\n        //   ['x', 'y', 'z', 'n'],\n        // ]\n        // ```\n        const contextSelectorGroupsLength = contextSelectorGroups.length;\n        repeatGroups(contextSelectorGroups, newContextSelectors.length);\n        for (let i = 0; i < newContextSelectors.length; i++) {\n          for (let j = 0; j < contextSelectorGroupsLength; j++) {\n            contextSelectorGroups[j + (i * contextSelectorGroupsLength)].push(\n                newContextSelectors[i]);\n          }\n        }\n\n        // Update the `selectorText` and see repeat to see if there are more `:host-context`s.\n        selectorText = match[2];\n      }\n\n      // The context selectors now must be combined with each other to capture all the possible\n      // selectors that `:host-context` can match. See `combineHostContextSelectors()` for more\n      // info about how this is done.\n      return contextSelectorGroups\n          .map(contextSelectors => combineHostContextSelectors(contextSelectors, selectorText))\n          .join(', ');\n    });\n  }\n\n  /*\n   * Convert combinators like ::shadow and pseudo-elements like ::content\n   * by replacing with space.\n   */\n  private _convertShadowDOMSelectors(cssText: string): string {\n    return _shadowDOMSelectorsRe.reduce((result, pattern) => result.replace(pattern, ' '), cssText);\n  }\n\n  // change a selector like 'div' to 'name div'\n  private _scopeSelectors(cssText: string, scopeSelector: string, hostSelector: string): string {\n    return processRules(cssText, (rule: CssRule) => {\n      let selector = rule.selector;\n      let content = rule.content;\n      if (rule.selector[0] !== '@') {\n        selector =\n            this._scopeSelector(rule.selector, scopeSelector, hostSelector, this.strictStyling);\n      } else if (\n          rule.selector.startsWith('@media') || rule.selector.startsWith('@supports') ||\n          rule.selector.startsWith('@document')) {\n        content = this._scopeSelectors(rule.content, scopeSelector, hostSelector);\n      } else if (rule.selector.startsWith('@font-face') || rule.selector.startsWith('@page')) {\n        content = this._stripScopingSelectors(rule.content);\n      }\n      return new CssRule(selector, content);\n    });\n  }\n\n  /**\n   * Handle a css text that is within a rule that should not contain scope selectors by simply\n   * removing them! An example of such a rule is `@font-face`.\n   *\n   * `@font-face` rules cannot contain nested selectors. Nor can they be nested under a selector.\n   * Normally this would be a syntax error by the author of the styles. But in some rare cases, such\n   * as importing styles from a library, and applying `:host ::ng-deep` to the imported styles, we\n   * can end up with broken css if the imported styles happen to contain @font-face rules.\n   *\n   * For example:\n   *\n   * ```\n   * :host ::ng-deep {\n   *   import 'some/lib/containing/font-face';\n   * }\n   *\n   * Similar logic applies to `@page` rules which can contain a particular set of properties,\n   * as well as some specific at-rules. Since they can't be encapsulated, we have to strip\n   * any scoping selectors from them. For more information: https://www.w3.org/TR/css-page-3\n   * ```\n   */\n  private _stripScopingSelectors(cssText: string): string {\n    return processRules(cssText, rule => {\n      const selector = rule.selector.replace(_shadowDeepSelectors, ' ')\n                           .replace(_polyfillHostNoCombinatorRe, ' ');\n      return new CssRule(selector, rule.content);\n    });\n  }\n\n  private _scopeSelector(\n      selector: string, scopeSelector: string, hostSelector: string, strict: boolean): string {\n    return selector.split(',')\n        .map(part => part.trim().split(_shadowDeepSelectors))\n        .map((deepParts) => {\n          const [shallowPart, ...otherParts] = deepParts;\n          const applyScope = (shallowPart: string) => {\n            if (this._selectorNeedsScoping(shallowPart, scopeSelector)) {\n              return strict ?\n                  this._applyStrictSelectorScope(shallowPart, scopeSelector, hostSelector) :\n                  this._applySelectorScope(shallowPart, scopeSelector, hostSelector);\n            } else {\n              return shallowPart;\n            }\n          };\n          return [applyScope(shallowPart), ...otherParts].join(' ');\n        })\n        .join(', ');\n  }\n\n  private _selectorNeedsScoping(selector: string, scopeSelector: string): boolean {\n    const re = this._makeScopeMatcher(scopeSelector);\n    return !re.test(selector);\n  }\n\n  private _makeScopeMatcher(scopeSelector: string): RegExp {\n    const lre = /\\[/g;\n    const rre = /\\]/g;\n    scopeSelector = scopeSelector.replace(lre, '\\\\[').replace(rre, '\\\\]');\n    return new RegExp('^(' + scopeSelector + ')' + _selectorReSuffix, 'm');\n  }\n\n  private _applySelectorScope(selector: string, scopeSelector: string, hostSelector: string):\n      string {\n    // Difference from webcomponents.js: scopeSelector could not be an array\n    return this._applySimpleSelectorScope(selector, scopeSelector, hostSelector);\n  }\n\n  // scope via name and [is=name]\n  private _applySimpleSelectorScope(selector: string, scopeSelector: string, hostSelector: string):\n      string {\n    // In Android browser, the lastIndex is not reset when the regex is used in String.replace()\n    _polyfillHostRe.lastIndex = 0;\n    if (_polyfillHostRe.test(selector)) {\n      const replaceBy = this.strictStyling ? `[${hostSelector}]` : scopeSelector;\n      return selector\n          .replace(\n              _polyfillHostNoCombinatorRe,\n              (hnc, selector) => {\n                return selector.replace(\n                    /([^:]*)(:*)(.*)/,\n                    (_: string, before: string, colon: string, after: string) => {\n                      return before + replaceBy + colon + after;\n                    });\n              })\n          .replace(_polyfillHostRe, replaceBy + ' ');\n    }\n\n    return scopeSelector + ' ' + selector;\n  }\n\n  // return a selector with [name] suffix on each simple selector\n  // e.g. .foo.bar > .zot becomes .foo[name].bar[name] > .zot[name]  /** @internal */\n  private _applyStrictSelectorScope(selector: string, scopeSelector: string, hostSelector: string):\n      string {\n    const isRe = /\\[is=([^\\]]*)\\]/g;\n    scopeSelector = scopeSelector.replace(isRe, (_: string, ...parts: string[]) => parts[0]);\n\n    const attrName = '[' + scopeSelector + ']';\n\n    const _scopeSelectorPart = (p: string) => {\n      let scopedP = p.trim();\n\n      if (!scopedP) {\n        return '';\n      }\n\n      if (p.indexOf(_polyfillHostNoCombinator) > -1) {\n        scopedP = this._applySimpleSelectorScope(p, scopeSelector, hostSelector);\n      } else {\n        // remove :host since it should be unnecessary\n        const t = p.replace(_polyfillHostRe, '');\n        if (t.length > 0) {\n          const matches = t.match(/([^:]*)(:*)(.*)/);\n          if (matches) {\n            scopedP = matches[1] + attrName + matches[2] + matches[3];\n          }\n        }\n      }\n\n      return scopedP;\n    };\n\n    const safeContent = new SafeSelector(selector);\n    selector = safeContent.content();\n\n    let scopedSelector = '';\n    let startIndex = 0;\n    let res: RegExpExecArray|null;\n    const sep = /( |>|\\+|~(?!=))\\s*/g;\n\n    // If a selector appears before :host it should not be shimmed as it\n    // matches on ancestor elements and not on elements in the host's shadow\n    // `:host-context(div)` is transformed to\n    // `-shadowcsshost-no-combinatordiv, div -shadowcsshost-no-combinator`\n    // the `div` is not part of the component in the 2nd selectors and should not be scoped.\n    // Historically `component-tag:host` was matching the component so we also want to preserve\n    // this behavior to avoid breaking legacy apps (it should not match).\n    // The behavior should be:\n    // - `tag:host` -> `tag[h]` (this is to avoid breaking legacy apps, should not match anything)\n    // - `tag :host` -> `tag [h]` (`tag` is not scoped because it's considered part of a\n    //   `:host-context(tag)`)\n    const hasHost = selector.indexOf(_polyfillHostNoCombinator) > -1;\n    // Only scope parts after the first `-shadowcsshost-no-combinator` when it is present\n    let shouldScope = !hasHost;\n\n    while ((res = sep.exec(selector)) !== null) {\n      const separator = res[1];\n      const part = selector.slice(startIndex, res.index).trim();\n      shouldScope = shouldScope || part.indexOf(_polyfillHostNoCombinator) > -1;\n      const scopedPart = shouldScope ? _scopeSelectorPart(part) : part;\n      scopedSelector += `${scopedPart} ${separator} `;\n      startIndex = sep.lastIndex;\n    }\n\n    const part = selector.substring(startIndex);\n    shouldScope = shouldScope || part.indexOf(_polyfillHostNoCombinator) > -1;\n    scopedSelector += shouldScope ? _scopeSelectorPart(part) : part;\n\n    // replace the placeholders with their original values\n    return safeContent.restore(scopedSelector);\n  }\n\n  private _insertPolyfillHostInCssText(selector: string): string {\n    return selector.replace(_colonHostContextRe, _polyfillHostContext)\n        .replace(_colonHostRe, _polyfillHost);\n  }\n}\n\nclass SafeSelector {\n  private placeholders: string[] = [];\n  private index = 0;\n  private _content: string;\n\n  constructor(selector: string) {\n    // Replaces attribute selectors with placeholders.\n    // The WS in [attr=\"va lue\"] would otherwise be interpreted as a selector separator.\n    selector = this._escapeRegexMatches(selector, /(\\[[^\\]]*\\])/g);\n\n    // CSS allows for certain special characters to be used in selectors if they're escaped.\n    // E.g. `.foo:blue` won't match a class called `foo:blue`, because the colon denotes a\n    // pseudo-class, but writing `.foo\\:blue` will match, because the colon was escaped.\n    // Replace all escape sequences (`\\` followed by a character) with a placeholder so\n    // that our handling of pseudo-selectors doesn't mess with them.\n    selector = this._escapeRegexMatches(selector, /(\\\\.)/g);\n\n    // Replaces the expression in `:nth-child(2n + 1)` with a placeholder.\n    // WS and \"+\" would otherwise be interpreted as selector separators.\n    this._content = selector.replace(/(:nth-[-\\w]+)(\\([^)]+\\))/g, (_, pseudo, exp) => {\n      const replaceBy = `__ph-${this.index}__`;\n      this.placeholders.push(exp);\n      this.index++;\n      return pseudo + replaceBy;\n    });\n  }\n\n  restore(content: string): string {\n    return content.replace(/__ph-(\\d+)__/g, (_ph, index) => this.placeholders[+index]);\n  }\n\n  content(): string {\n    return this._content;\n  }\n\n  /**\n   * Replaces all of the substrings that match a regex within a\n   * special string (e.g. `__ph-0__`, `__ph-1__`, etc).\n   */\n  private _escapeRegexMatches(content: string, pattern: RegExp): string {\n    return content.replace(pattern, (_, keep) => {\n      const replaceBy = `__ph-${this.index}__`;\n      this.placeholders.push(keep);\n      this.index++;\n      return replaceBy;\n    });\n  }\n}\n\nconst _cssContentNextSelectorRe =\n    /polyfill-next-selector[^}]*content:[\\s]*?(['\"])(.*?)\\1[;\\s]*}([^{]*?){/gim;\nconst _cssContentRuleRe = /(polyfill-rule)[^}]*(content:[\\s]*(['\"])(.*?)\\3)[;\\s]*[^}]*}/gim;\nconst _cssContentUnscopedRuleRe =\n    /(polyfill-unscoped-rule)[^}]*(content:[\\s]*(['\"])(.*?)\\3)[;\\s]*[^}]*}/gim;\nconst _polyfillHost = '-shadowcsshost';\n// note: :host-context pre-processed to -shadowcsshostcontext.\nconst _polyfillHostContext = '-shadowcsscontext';\nconst _parenSuffix = '(?:\\\\((' +\n    '(?:\\\\([^)(]*\\\\)|[^)(]*)+?' +\n    ')\\\\))?([^,{]*)';\nconst _cssColonHostRe = new RegExp(_polyfillHost + _parenSuffix, 'gim');\nconst _cssColonHostContextReGlobal = new RegExp(_polyfillHostContext + _parenSuffix, 'gim');\nconst _cssColonHostContextRe = new RegExp(_polyfillHostContext + _parenSuffix, 'im');\nconst _polyfillHostNoCombinator = _polyfillHost + '-no-combinator';\nconst _polyfillHostNoCombinatorRe = /-shadowcsshost-no-combinator([^\\s]*)/;\nconst _shadowDOMSelectorsRe = [\n  /::shadow/g,\n  /::content/g,\n  // Deprecated selectors\n  /\\/shadow-deep\\//g,\n  /\\/shadow\\//g,\n];\n\n// The deep combinator is deprecated in the CSS spec\n// Support for `>>>`, `deep`, `::ng-deep` is then also deprecated and will be removed in the future.\n// see https://github.com/angular/angular/pull/17677\nconst _shadowDeepSelectors = /(?:>>>)|(?:\\/deep\\/)|(?:::ng-deep)/g;\nconst _selectorReSuffix = '([>\\\\s~+[.,{:][\\\\s\\\\S]*)?$';\nconst _polyfillHostRe = /-shadowcsshost/gim;\nconst _colonHostRe = /:host/gim;\nconst _colonHostContextRe = /:host-context/gim;\n\nconst _commentRe = /\\/\\*[\\s\\S]*?\\*\\//g;\n\nfunction stripComments(input: string): string {\n  return input.replace(_commentRe, '');\n}\n\nconst _commentWithHashRe = /\\/\\*\\s*#\\s*source(Mapping)?URL=[\\s\\S]+?\\*\\//g;\n\nfunction extractCommentsWithHash(input: string): string[] {\n  return input.match(_commentWithHashRe) || [];\n}\n\nconst BLOCK_PLACEHOLDER = '%BLOCK%';\nconst QUOTE_PLACEHOLDER = '%QUOTED%';\nconst _ruleRe = /(\\s*)([^;\\{\\}]+?)(\\s*)((?:{%BLOCK%}?\\s*;?)|(?:\\s*;))/g;\nconst _quotedRe = /%QUOTED%/g;\nconst CONTENT_PAIRS = new Map([['{', '}']]);\nconst QUOTE_PAIRS = new Map([[`\"`, `\"`], [`'`, `'`]]);\n\nexport class CssRule {\n  constructor(public selector: string, public content: string) {}\n}\n\nexport function processRules(input: string, ruleCallback: (rule: CssRule) => CssRule): string {\n  const inputWithEscapedQuotes = escapeBlocks(input, QUOTE_PAIRS, QUOTE_PLACEHOLDER);\n  const inputWithEscapedBlocks =\n      escapeBlocks(inputWithEscapedQuotes.escapedString, CONTENT_PAIRS, BLOCK_PLACEHOLDER);\n  let nextBlockIndex = 0;\n  let nextQuoteIndex = 0;\n  return inputWithEscapedBlocks.escapedString\n      .replace(\n          _ruleRe,\n          (...m: string[]) => {\n            const selector = m[2];\n            let content = '';\n            let suffix = m[4];\n            let contentPrefix = '';\n            if (suffix && suffix.startsWith('{' + BLOCK_PLACEHOLDER)) {\n              content = inputWithEscapedBlocks.blocks[nextBlockIndex++];\n              suffix = suffix.substring(BLOCK_PLACEHOLDER.length + 1);\n              contentPrefix = '{';\n            }\n            const rule = ruleCallback(new CssRule(selector, content));\n            return `${m[1]}${rule.selector}${m[3]}${contentPrefix}${rule.content}${suffix}`;\n          })\n      .replace(_quotedRe, () => inputWithEscapedQuotes.blocks[nextQuoteIndex++]);\n}\n\nclass StringWithEscapedBlocks {\n  constructor(public escapedString: string, public blocks: string[]) {}\n}\n\nfunction escapeBlocks(\n    input: string, charPairs: Map<string, string>, placeholder: string): StringWithEscapedBlocks {\n  const resultParts: string[] = [];\n  const escapedBlocks: string[] = [];\n  let openCharCount = 0;\n  let nonBlockStartIndex = 0;\n  let blockStartIndex = -1;\n  let openChar: string|undefined;\n  let closeChar: string|undefined;\n  for (let i = 0; i < input.length; i++) {\n    const char = input[i];\n    if (char === '\\\\') {\n      i++;\n    } else if (char === closeChar) {\n      openCharCount--;\n      if (openCharCount === 0) {\n        escapedBlocks.push(input.substring(blockStartIndex, i));\n        resultParts.push(placeholder);\n        nonBlockStartIndex = i;\n        blockStartIndex = -1;\n        openChar = closeChar = undefined;\n      }\n    } else if (char === openChar) {\n      openCharCount++;\n    } else if (openCharCount === 0 && charPairs.has(char)) {\n      openChar = char;\n      closeChar = charPairs.get(char);\n      openCharCount = 1;\n      blockStartIndex = i + 1;\n      resultParts.push(input.substring(nonBlockStartIndex, blockStartIndex));\n    }\n  }\n  if (blockStartIndex !== -1) {\n    escapedBlocks.push(input.substring(blockStartIndex));\n    resultParts.push(placeholder);\n  } else {\n    resultParts.push(input.substring(nonBlockStartIndex));\n  }\n  return new StringWithEscapedBlocks(resultParts.join(''), escapedBlocks);\n}\n\n/**\n * Combine the `contextSelectors` with the `hostMarker` and the `otherSelectors`\n * to create a selector that matches the same as `:host-context()`.\n *\n * Given a single context selector `A` we need to output selectors that match on the host and as an\n * ancestor of the host:\n *\n * ```\n * A <hostMarker>, A<hostMarker> {}\n * ```\n *\n * When there is more than one context selector we also have to create combinations of those\n * selectors with each other. For example if there are `A` and `B` selectors the output is:\n *\n * ```\n * AB<hostMarker>, AB <hostMarker>, A B<hostMarker>,\n * B A<hostMarker>, A B <hostMarker>, B A <hostMarker> {}\n * ```\n *\n * And so on...\n *\n * @param hostMarker the string that selects the host element.\n * @param contextSelectors an array of context selectors that will be combined.\n * @param otherSelectors the rest of the selectors that are not context selectors.\n */\nfunction combineHostContextSelectors(contextSelectors: string[], otherSelectors: string): string {\n  const hostMarker = _polyfillHostNoCombinator;\n  _polyfillHostRe.lastIndex = 0;  // reset the regex to ensure we get an accurate test\n  const otherSelectorsHasHost = _polyfillHostRe.test(otherSelectors);\n\n  // If there are no context selectors then just output a host marker\n  if (contextSelectors.length === 0) {\n    return hostMarker + otherSelectors;\n  }\n\n  const combined: string[] = [contextSelectors.pop() || ''];\n  while (contextSelectors.length > 0) {\n    const length = combined.length;\n    const contextSelector = contextSelectors.pop();\n    for (let i = 0; i < length; i++) {\n      const previousSelectors = combined[i];\n      // Add the new selector as a descendant of the previous selectors\n      combined[length * 2 + i] = previousSelectors + ' ' + contextSelector;\n      // Add the new selector as an ancestor of the previous selectors\n      combined[length + i] = contextSelector + ' ' + previousSelectors;\n      // Add the new selector to act on the same element as the previous selectors\n      combined[i] = contextSelector + previousSelectors;\n    }\n  }\n  // Finally connect the selector to the `hostMarker`s: either acting directly on the host\n  // (A<hostMarker>) or as an ancestor (A <hostMarker>).\n  return combined\n      .map(\n          s => otherSelectorsHasHost ?\n              `${s}${otherSelectors}` :\n              `${s}${hostMarker}${otherSelectors}, ${s} ${hostMarker}${otherSelectors}`)\n      .join(',');\n}\n\n/**\n * Mutate the given `groups` array so that there are `multiples` clones of the original array\n * stored.\n *\n * For example `repeatGroups([a, b], 3)` will result in `[a, b, a, b, a, b]` - but importantly the\n * newly added groups will be clones of the original.\n *\n * @param groups An array of groups of strings that will be repeated. This array is mutated\n *     in-place.\n * @param multiples The number of times the current groups should appear.\n */\nexport function repeatGroups(groups: string[][], multiples: number): void {\n  const length = groups.length;\n  for (let i = 1; i < multiples; i++) {\n    for (let j = 0; j < length; j++) {\n      groups[j + (i * length)] = groups[j].slice(0);\n    }\n  }\n}\n"]}
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