@angular/compiler
Version:
Angular - the compiler library
352 lines • 47.1 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { getHtmlTagDefinition } from './ml_parser/html_tags';
const _SELECTOR_REGEXP = new RegExp('(\\:not\\()|' + //":not("
'([-\\w]+)|' + // "tag"
'(?:\\.([-\\w]+))|' + // ".class"
// "-" should appear first in the regexp below as FF31 parses "[.-\w]" as a range
'(?:\\[([-.\\w*]+)(?:=([\"\']?)([^\\]\"\']*)\\5)?\\])|' + // "[name]", "[name=value]",
// "[name="value"]",
// "[name='value']"
'(\\))|' + // ")"
'(\\s*,\\s*)', // ","
'g');
/**
* A css selector contains an element name,
* css classes and attribute/value pairs with the purpose
* of selecting subsets out of them.
*/
export class CssSelector {
constructor() {
this.element = null;
this.classNames = [];
/**
* The selectors are encoded in pairs where:
* - even locations are attribute names
* - odd locations are attribute values.
*
* Example:
* Selector: `[key1=value1][key2]` would parse to:
* ```
* ['key1', 'value1', 'key2', '']
* ```
*/
this.attrs = [];
this.notSelectors = [];
}
static parse(selector) {
const results = [];
const _addResult = (res, cssSel) => {
if (cssSel.notSelectors.length > 0 && !cssSel.element && cssSel.classNames.length == 0 &&
cssSel.attrs.length == 0) {
cssSel.element = '*';
}
res.push(cssSel);
};
let cssSelector = new CssSelector();
let match;
let current = cssSelector;
let inNot = false;
_SELECTOR_REGEXP.lastIndex = 0;
while (match = _SELECTOR_REGEXP.exec(selector)) {
if (match[1]) {
if (inNot) {
throw new Error('Nesting :not is not allowed in a selector');
}
inNot = true;
current = new CssSelector();
cssSelector.notSelectors.push(current);
}
if (match[2]) {
current.setElement(match[2]);
}
if (match[3]) {
current.addClassName(match[3]);
}
if (match[4]) {
current.addAttribute(match[4], match[6]);
}
if (match[7]) {
inNot = false;
current = cssSelector;
}
if (match[8]) {
if (inNot) {
throw new Error('Multiple selectors in :not are not supported');
}
_addResult(results, cssSelector);
cssSelector = current = new CssSelector();
}
}
_addResult(results, cssSelector);
return results;
}
isElementSelector() {
return this.hasElementSelector() && this.classNames.length == 0 && this.attrs.length == 0 &&
this.notSelectors.length === 0;
}
hasElementSelector() { return !!this.element; }
setElement(element = null) { this.element = element; }
/** Gets a template string for an element that matches the selector. */
getMatchingElementTemplate() {
const tagName = this.element || 'div';
const classAttr = this.classNames.length > 0 ? ` class="${this.classNames.join(' ')}"` : '';
let attrs = '';
for (let i = 0; i < this.attrs.length; i += 2) {
const attrName = this.attrs[i];
const attrValue = this.attrs[i + 1] !== '' ? `="${this.attrs[i + 1]}"` : '';
attrs += ` ${attrName}${attrValue}`;
}
return getHtmlTagDefinition(tagName).isVoid ? `<${tagName}${classAttr}${attrs}/>` :
`<${tagName}${classAttr}${attrs}></${tagName}>`;
}
getAttrs() {
const result = [];
if (this.classNames.length > 0) {
result.push('class', this.classNames.join(' '));
}
return result.concat(this.attrs);
}
addAttribute(name, value = '') {
this.attrs.push(name, value && value.toLowerCase() || '');
}
addClassName(name) { this.classNames.push(name.toLowerCase()); }
toString() {
let res = this.element || '';
if (this.classNames) {
this.classNames.forEach(klass => res += `.${klass}`);
}
if (this.attrs) {
for (let i = 0; i < this.attrs.length; i += 2) {
const name = this.attrs[i];
const value = this.attrs[i + 1];
res += `[${name}${value ? '=' + value : ''}]`;
}
}
this.notSelectors.forEach(notSelector => res += `:not(${notSelector})`);
return res;
}
}
/**
* Reads a list of CssSelectors and allows to calculate which ones
* are contained in a given CssSelector.
*/
export class SelectorMatcher {
constructor() {
this._elementMap = new Map();
this._elementPartialMap = new Map();
this._classMap = new Map();
this._classPartialMap = new Map();
this._attrValueMap = new Map();
this._attrValuePartialMap = new Map();
this._listContexts = [];
}
static createNotMatcher(notSelectors) {
const notMatcher = new SelectorMatcher();
notMatcher.addSelectables(notSelectors, null);
return notMatcher;
}
addSelectables(cssSelectors, callbackCtxt) {
let listContext = null;
if (cssSelectors.length > 1) {
listContext = new SelectorListContext(cssSelectors);
this._listContexts.push(listContext);
}
for (let i = 0; i < cssSelectors.length; i++) {
this._addSelectable(cssSelectors[i], callbackCtxt, listContext);
}
}
/**
* Add an object that can be found later on by calling `match`.
* @param cssSelector A css selector
* @param callbackCtxt An opaque object that will be given to the callback of the `match` function
*/
_addSelectable(cssSelector, callbackCtxt, listContext) {
let matcher = this;
const element = cssSelector.element;
const classNames = cssSelector.classNames;
const attrs = cssSelector.attrs;
const selectable = new SelectorContext(cssSelector, callbackCtxt, listContext);
if (element) {
const isTerminal = attrs.length === 0 && classNames.length === 0;
if (isTerminal) {
this._addTerminal(matcher._elementMap, element, selectable);
}
else {
matcher = this._addPartial(matcher._elementPartialMap, element);
}
}
if (classNames) {
for (let i = 0; i < classNames.length; i++) {
const isTerminal = attrs.length === 0 && i === classNames.length - 1;
const className = classNames[i];
if (isTerminal) {
this._addTerminal(matcher._classMap, className, selectable);
}
else {
matcher = this._addPartial(matcher._classPartialMap, className);
}
}
}
if (attrs) {
for (let i = 0; i < attrs.length; i += 2) {
const isTerminal = i === attrs.length - 2;
const name = attrs[i];
const value = attrs[i + 1];
if (isTerminal) {
const terminalMap = matcher._attrValueMap;
let terminalValuesMap = terminalMap.get(name);
if (!terminalValuesMap) {
terminalValuesMap = new Map();
terminalMap.set(name, terminalValuesMap);
}
this._addTerminal(terminalValuesMap, value, selectable);
}
else {
const partialMap = matcher._attrValuePartialMap;
let partialValuesMap = partialMap.get(name);
if (!partialValuesMap) {
partialValuesMap = new Map();
partialMap.set(name, partialValuesMap);
}
matcher = this._addPartial(partialValuesMap, value);
}
}
}
}
_addTerminal(map, name, selectable) {
let terminalList = map.get(name);
if (!terminalList) {
terminalList = [];
map.set(name, terminalList);
}
terminalList.push(selectable);
}
_addPartial(map, name) {
let matcher = map.get(name);
if (!matcher) {
matcher = new SelectorMatcher();
map.set(name, matcher);
}
return matcher;
}
/**
* Find the objects that have been added via `addSelectable`
* whose css selector is contained in the given css selector.
* @param cssSelector A css selector
* @param matchedCallback This callback will be called with the object handed into `addSelectable`
* @return boolean true if a match was found
*/
match(cssSelector, matchedCallback) {
let result = false;
const element = cssSelector.element;
const classNames = cssSelector.classNames;
const attrs = cssSelector.attrs;
for (let i = 0; i < this._listContexts.length; i++) {
this._listContexts[i].alreadyMatched = false;
}
result = this._matchTerminal(this._elementMap, element, cssSelector, matchedCallback) || result;
result = this._matchPartial(this._elementPartialMap, element, cssSelector, matchedCallback) ||
result;
if (classNames) {
for (let i = 0; i < classNames.length; i++) {
const className = classNames[i];
result =
this._matchTerminal(this._classMap, className, cssSelector, matchedCallback) || result;
result =
this._matchPartial(this._classPartialMap, className, cssSelector, matchedCallback) ||
result;
}
}
if (attrs) {
for (let i = 0; i < attrs.length; i += 2) {
const name = attrs[i];
const value = attrs[i + 1];
const terminalValuesMap = this._attrValueMap.get(name);
if (value) {
result =
this._matchTerminal(terminalValuesMap, '', cssSelector, matchedCallback) || result;
}
result =
this._matchTerminal(terminalValuesMap, value, cssSelector, matchedCallback) || result;
const partialValuesMap = this._attrValuePartialMap.get(name);
if (value) {
result = this._matchPartial(partialValuesMap, '', cssSelector, matchedCallback) || result;
}
result =
this._matchPartial(partialValuesMap, value, cssSelector, matchedCallback) || result;
}
}
return result;
}
/** @internal */
_matchTerminal(map, name, cssSelector, matchedCallback) {
if (!map || typeof name !== 'string') {
return false;
}
let selectables = map.get(name) || [];
const starSelectables = map.get('*');
if (starSelectables) {
selectables = selectables.concat(starSelectables);
}
if (selectables.length === 0) {
return false;
}
let selectable;
let result = false;
for (let i = 0; i < selectables.length; i++) {
selectable = selectables[i];
result = selectable.finalize(cssSelector, matchedCallback) || result;
}
return result;
}
/** @internal */
_matchPartial(map, name, cssSelector, matchedCallback) {
if (!map || typeof name !== 'string') {
return false;
}
const nestedSelector = map.get(name);
if (!nestedSelector) {
return false;
}
// TODO(perf): get rid of recursion and measure again
// TODO(perf): don't pass the whole selector into the recursion,
// but only the not processed parts
return nestedSelector.match(cssSelector, matchedCallback);
}
}
export class SelectorListContext {
constructor(selectors) {
this.selectors = selectors;
this.alreadyMatched = false;
}
}
// Store context to pass back selector and context when a selector is matched
export class SelectorContext {
constructor(selector, cbContext, listContext) {
this.selector = selector;
this.cbContext = cbContext;
this.listContext = listContext;
this.notSelectors = selector.notSelectors;
}
finalize(cssSelector, callback) {
let result = true;
if (this.notSelectors.length > 0 && (!this.listContext || !this.listContext.alreadyMatched)) {
const notMatcher = SelectorMatcher.createNotMatcher(this.notSelectors);
result = !notMatcher.match(cssSelector, null);
}
if (result && callback && (!this.listContext || !this.listContext.alreadyMatched)) {
if (this.listContext) {
this.listContext.alreadyMatched = true;
}
callback(this.selector, this.cbContext);
}
return result;
}
}
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* @license\n * Copyright Google Inc. 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\nimport {getHtmlTagDefinition} from './ml_parser/html_tags';\n\nconst _SELECTOR_REGEXP = new RegExp(\n    '(\\\\:not\\\\()|' +           //\":not(\"\n        '([-\\\\w]+)|' +         // \"tag\"\n        '(?:\\\\.([-\\\\w]+))|' +  // \".class\"\n        // \"-\" should appear first in the regexp below as FF31 parses \"[.-\\w]\" as a range\n        '(?:\\\\[([-.\\\\w*]+)(?:=([\\\"\\']?)([^\\\\]\\\"\\']*)\\\\5)?\\\\])|' +  // \"[name]\", \"[name=value]\",\n                                                                   // \"[name=\"value\"]\",\n                                                                   // \"[name='value']\"\n        '(\\\\))|' +                                                 // \")\"\n        '(\\\\s*,\\\\s*)',                                             // \",\"\n    'g');\n\n/**\n * A css selector contains an element name,\n * css classes and attribute/value pairs with the purpose\n * of selecting subsets out of them.\n */\nexport class CssSelector {\n  element: string|null = null;\n  classNames: string[] = [];\n  /**\n   * The selectors are encoded in pairs where:\n   * - even locations are attribute names\n   * - odd locations are attribute values.\n   *\n   * Example:\n   * Selector: `[key1=value1][key2]` would parse to:\n   * ```\n   * ['key1', 'value1', 'key2', '']\n   * ```\n   */\n  attrs: string[] = [];\n  notSelectors: CssSelector[] = [];\n\n  static parse(selector: string): CssSelector[] {\n    const results: CssSelector[] = [];\n    const _addResult = (res: CssSelector[], cssSel: CssSelector) => {\n      if (cssSel.notSelectors.length > 0 && !cssSel.element && cssSel.classNames.length == 0 &&\n          cssSel.attrs.length == 0) {\n        cssSel.element = '*';\n      }\n      res.push(cssSel);\n    };\n    let cssSelector = new CssSelector();\n    let match: string[]|null;\n    let current = cssSelector;\n    let inNot = false;\n    _SELECTOR_REGEXP.lastIndex = 0;\n    while (match = _SELECTOR_REGEXP.exec(selector)) {\n      if (match[1]) {\n        if (inNot) {\n          throw new Error('Nesting :not is not allowed in a selector');\n        }\n        inNot = true;\n        current = new CssSelector();\n        cssSelector.notSelectors.push(current);\n      }\n      if (match[2]) {\n        current.setElement(match[2]);\n      }\n      if (match[3]) {\n        current.addClassName(match[3]);\n      }\n      if (match[4]) {\n        current.addAttribute(match[4], match[6]);\n      }\n      if (match[7]) {\n        inNot = false;\n        current = cssSelector;\n      }\n      if (match[8]) {\n        if (inNot) {\n          throw new Error('Multiple selectors in :not are not supported');\n        }\n        _addResult(results, cssSelector);\n        cssSelector = current = new CssSelector();\n      }\n    }\n    _addResult(results, cssSelector);\n    return results;\n  }\n\n  isElementSelector(): boolean {\n    return this.hasElementSelector() && this.classNames.length == 0 && this.attrs.length == 0 &&\n        this.notSelectors.length === 0;\n  }\n\n  hasElementSelector(): boolean { return !!this.element; }\n\n  setElement(element: string|null = null) { this.element = element; }\n\n  /** Gets a template string for an element that matches the selector. */\n  getMatchingElementTemplate(): string {\n    const tagName = this.element || 'div';\n    const classAttr = this.classNames.length > 0 ? ` class=\"${this.classNames.join(' ')}\"` : '';\n\n    let attrs = '';\n    for (let i = 0; i < this.attrs.length; i += 2) {\n      const attrName = this.attrs[i];\n      const attrValue = this.attrs[i + 1] !== '' ? `=\"${this.attrs[i + 1]}\"` : '';\n      attrs += ` ${attrName}${attrValue}`;\n    }\n\n    return getHtmlTagDefinition(tagName).isVoid ? `<${tagName}${classAttr}${attrs}/>` :\n                                                  `<${tagName}${classAttr}${attrs}></${tagName}>`;\n  }\n\n  getAttrs(): string[] {\n    const result: string[] = [];\n    if (this.classNames.length > 0) {\n      result.push('class', this.classNames.join(' '));\n    }\n    return result.concat(this.attrs);\n  }\n\n  addAttribute(name: string, value: string = '') {\n    this.attrs.push(name, value && value.toLowerCase() || '');\n  }\n\n  addClassName(name: string) { this.classNames.push(name.toLowerCase()); }\n\n  toString(): string {\n    let res: string = this.element || '';\n    if (this.classNames) {\n      this.classNames.forEach(klass => res += `.${klass}`);\n    }\n    if (this.attrs) {\n      for (let i = 0; i < this.attrs.length; i += 2) {\n        const name = this.attrs[i];\n        const value = this.attrs[i + 1];\n        res += `[${name}${value ? '=' + value : ''}]`;\n      }\n    }\n    this.notSelectors.forEach(notSelector => res += `:not(${notSelector})`);\n    return res;\n  }\n}\n\n/**\n * Reads a list of CssSelectors and allows to calculate which ones\n * are contained in a given CssSelector.\n */\nexport class SelectorMatcher {\n  static createNotMatcher(notSelectors: CssSelector[]): SelectorMatcher {\n    const notMatcher = new SelectorMatcher();\n    notMatcher.addSelectables(notSelectors, null);\n    return notMatcher;\n  }\n\n  private _elementMap = new Map<string, SelectorContext[]>();\n  private _elementPartialMap = new Map<string, SelectorMatcher>();\n  private _classMap = new Map<string, SelectorContext[]>();\n  private _classPartialMap = new Map<string, SelectorMatcher>();\n  private _attrValueMap = new Map<string, Map<string, SelectorContext[]>>();\n  private _attrValuePartialMap = new Map<string, Map<string, SelectorMatcher>>();\n  private _listContexts: SelectorListContext[] = [];\n\n  addSelectables(cssSelectors: CssSelector[], callbackCtxt?: any) {\n    let listContext: SelectorListContext = null !;\n    if (cssSelectors.length > 1) {\n      listContext = new SelectorListContext(cssSelectors);\n      this._listContexts.push(listContext);\n    }\n    for (let i = 0; i < cssSelectors.length; i++) {\n      this._addSelectable(cssSelectors[i], callbackCtxt, listContext);\n    }\n  }\n\n  /**\n   * Add an object that can be found later on by calling `match`.\n   * @param cssSelector A css selector\n   * @param callbackCtxt An opaque object that will be given to the callback of the `match` function\n   */\n  private _addSelectable(\n      cssSelector: CssSelector, callbackCtxt: any, listContext: SelectorListContext) {\n    let matcher: SelectorMatcher = this;\n    const element = cssSelector.element;\n    const classNames = cssSelector.classNames;\n    const attrs = cssSelector.attrs;\n    const selectable = new SelectorContext(cssSelector, callbackCtxt, listContext);\n\n    if (element) {\n      const isTerminal = attrs.length === 0 && classNames.length === 0;\n      if (isTerminal) {\n        this._addTerminal(matcher._elementMap, element, selectable);\n      } else {\n        matcher = this._addPartial(matcher._elementPartialMap, element);\n      }\n    }\n\n    if (classNames) {\n      for (let i = 0; i < classNames.length; i++) {\n        const isTerminal = attrs.length === 0 && i === classNames.length - 1;\n        const className = classNames[i];\n        if (isTerminal) {\n          this._addTerminal(matcher._classMap, className, selectable);\n        } else {\n          matcher = this._addPartial(matcher._classPartialMap, className);\n        }\n      }\n    }\n\n    if (attrs) {\n      for (let i = 0; i < attrs.length; i += 2) {\n        const isTerminal = i === attrs.length - 2;\n        const name = attrs[i];\n        const value = attrs[i + 1];\n        if (isTerminal) {\n          const terminalMap = matcher._attrValueMap;\n          let terminalValuesMap = terminalMap.get(name);\n          if (!terminalValuesMap) {\n            terminalValuesMap = new Map<string, SelectorContext[]>();\n            terminalMap.set(name, terminalValuesMap);\n          }\n          this._addTerminal(terminalValuesMap, value, selectable);\n        } else {\n          const partialMap = matcher._attrValuePartialMap;\n          let partialValuesMap = partialMap.get(name);\n          if (!partialValuesMap) {\n            partialValuesMap = new Map<string, SelectorMatcher>();\n            partialMap.set(name, partialValuesMap);\n          }\n          matcher = this._addPartial(partialValuesMap, value);\n        }\n      }\n    }\n  }\n\n  private _addTerminal(\n      map: Map<string, SelectorContext[]>, name: string, selectable: SelectorContext) {\n    let terminalList = map.get(name);\n    if (!terminalList) {\n      terminalList = [];\n      map.set(name, terminalList);\n    }\n    terminalList.push(selectable);\n  }\n\n  private _addPartial(map: Map<string, SelectorMatcher>, name: string): SelectorMatcher {\n    let matcher = map.get(name);\n    if (!matcher) {\n      matcher = new SelectorMatcher();\n      map.set(name, matcher);\n    }\n    return matcher;\n  }\n\n  /**\n   * Find the objects that have been added via `addSelectable`\n   * whose css selector is contained in the given css selector.\n   * @param cssSelector A css selector\n   * @param matchedCallback This callback will be called with the object handed into `addSelectable`\n   * @return boolean true if a match was found\n  */\n  match(cssSelector: CssSelector, matchedCallback: ((c: CssSelector, a: any) => void)|null):\n      boolean {\n    let result = false;\n    const element = cssSelector.element !;\n    const classNames = cssSelector.classNames;\n    const attrs = cssSelector.attrs;\n\n    for (let i = 0; i < this._listContexts.length; i++) {\n      this._listContexts[i].alreadyMatched = false;\n    }\n\n    result = this._matchTerminal(this._elementMap, element, cssSelector, matchedCallback) || result;\n    result = this._matchPartial(this._elementPartialMap, element, cssSelector, matchedCallback) ||\n        result;\n\n    if (classNames) {\n      for (let i = 0; i < classNames.length; i++) {\n        const className = classNames[i];\n        result =\n            this._matchTerminal(this._classMap, className, cssSelector, matchedCallback) || result;\n        result =\n            this._matchPartial(this._classPartialMap, className, cssSelector, matchedCallback) ||\n            result;\n      }\n    }\n\n    if (attrs) {\n      for (let i = 0; i < attrs.length; i += 2) {\n        const name = attrs[i];\n        const value = attrs[i + 1];\n\n        const terminalValuesMap = this._attrValueMap.get(name) !;\n        if (value) {\n          result =\n              this._matchTerminal(terminalValuesMap, '', cssSelector, matchedCallback) || result;\n        }\n        result =\n            this._matchTerminal(terminalValuesMap, value, cssSelector, matchedCallback) || result;\n\n        const partialValuesMap = this._attrValuePartialMap.get(name) !;\n        if (value) {\n          result = this._matchPartial(partialValuesMap, '', cssSelector, matchedCallback) || result;\n        }\n        result =\n            this._matchPartial(partialValuesMap, value, cssSelector, matchedCallback) || result;\n      }\n    }\n    return result;\n  }\n\n  /** @internal */\n  _matchTerminal(\n      map: Map<string, SelectorContext[]>, name: string, cssSelector: CssSelector,\n      matchedCallback: ((c: CssSelector, a: any) => void)|null): boolean {\n    if (!map || typeof name !== 'string') {\n      return false;\n    }\n\n    let selectables: SelectorContext[] = map.get(name) || [];\n    const starSelectables: SelectorContext[] = map.get('*') !;\n    if (starSelectables) {\n      selectables = selectables.concat(starSelectables);\n    }\n    if (selectables.length === 0) {\n      return false;\n    }\n    let selectable: SelectorContext;\n    let result = false;\n    for (let i = 0; i < selectables.length; i++) {\n      selectable = selectables[i];\n      result = selectable.finalize(cssSelector, matchedCallback) || result;\n    }\n    return result;\n  }\n\n  /** @internal */\n  _matchPartial(\n      map: Map<string, SelectorMatcher>, name: string, cssSelector: CssSelector,\n      matchedCallback: ((c: CssSelector, a: any) => void)|null): boolean {\n    if (!map || typeof name !== 'string') {\n      return false;\n    }\n\n    const nestedSelector = map.get(name);\n    if (!nestedSelector) {\n      return false;\n    }\n    // TODO(perf): get rid of recursion and measure again\n    // TODO(perf): don't pass the whole selector into the recursion,\n    // but only the not processed parts\n    return nestedSelector.match(cssSelector, matchedCallback);\n  }\n}\n\n\nexport class SelectorListContext {\n  alreadyMatched: boolean = false;\n\n  constructor(public selectors: CssSelector[]) {}\n}\n\n// Store context to pass back selector and context when a selector is matched\nexport class SelectorContext {\n  notSelectors: CssSelector[];\n\n  constructor(\n      public selector: CssSelector, public cbContext: any,\n      public listContext: SelectorListContext) {\n    this.notSelectors = selector.notSelectors;\n  }\n\n  finalize(cssSelector: CssSelector, callback: ((c: CssSelector, a: any) => void)|null): boolean {\n    let result = true;\n    if (this.notSelectors.length > 0 && (!this.listContext || !this.listContext.alreadyMatched)) {\n      const notMatcher = SelectorMatcher.createNotMatcher(this.notSelectors);\n      result = !notMatcher.match(cssSelector, null);\n    }\n    if (result && callback && (!this.listContext || !this.listContext.alreadyMatched)) {\n      if (this.listContext) {\n        this.listContext.alreadyMatched = true;\n      }\n      callback(this.selector, this.cbContext);\n    }\n    return result;\n  }\n}\n"]}