/**
 * @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 { __extends } from "tslib";
import { ParseError, ParseSourceSpan } from '../parse_util';
import * as html from './ast';
import * as lex from './lexer';
import { getNsPrefix, isNgContainer, mergeNsAndName } from './tags';
var TreeError = /** @class */ (function (_super) {
    __extends(TreeError, _super);
    function TreeError(elementName, span, msg) {
        var _this = _super.call(this, span, msg) || this;
        _this.elementName = elementName;
        return _this;
    }
    TreeError.create = function (elementName, span, msg) {
        return new TreeError(elementName, span, msg);
    };
    return TreeError;
}(ParseError));
export { TreeError };
var ParseTreeResult = /** @class */ (function () {
    function ParseTreeResult(rootNodes, errors) {
        this.rootNodes = rootNodes;
        this.errors = errors;
    }
    return ParseTreeResult;
}());
export { ParseTreeResult };
var Parser = /** @class */ (function () {
    function Parser(getTagDefinition) {
        this.getTagDefinition = getTagDefinition;
    }
    Parser.prototype.parse = function (source, url, options) {
        var tokensAndErrors = lex.tokenize(source, url, this.getTagDefinition, options);
        var treeAndErrors = new _TreeBuilder(tokensAndErrors.tokens, this.getTagDefinition).build();
        return new ParseTreeResult(treeAndErrors.rootNodes, tokensAndErrors.errors.concat(treeAndErrors.errors));
    };
    return Parser;
}());
export { Parser };
var _TreeBuilder = /** @class */ (function () {
    function _TreeBuilder(tokens, getTagDefinition) {
        this.tokens = tokens;
        this.getTagDefinition = getTagDefinition;
        this._index = -1;
        this._rootNodes = [];
        this._errors = [];
        this._elementStack = [];
        this._advance();
    }
    _TreeBuilder.prototype.build = function () {
        while (this._peek.type !== lex.TokenType.EOF) {
            if (this._peek.type === lex.TokenType.TAG_OPEN_START) {
                this._consumeStartTag(this._advance());
            }
            else if (this._peek.type === lex.TokenType.TAG_CLOSE) {
                this._consumeEndTag(this._advance());
            }
            else if (this._peek.type === lex.TokenType.CDATA_START) {
                this._closeVoidElement();
                this._consumeCdata(this._advance());
            }
            else if (this._peek.type === lex.TokenType.COMMENT_START) {
                this._closeVoidElement();
                this._consumeComment(this._advance());
            }
            else if (this._peek.type === lex.TokenType.TEXT || this._peek.type === lex.TokenType.RAW_TEXT ||
                this._peek.type === lex.TokenType.ESCAPABLE_RAW_TEXT) {
                this._closeVoidElement();
                this._consumeText(this._advance());
            }
            else if (this._peek.type === lex.TokenType.EXPANSION_FORM_START) {
                this._consumeExpansion(this._advance());
            }
            else {
                // Skip all other tokens...
                this._advance();
            }
        }
        return new ParseTreeResult(this._rootNodes, this._errors);
    };
    _TreeBuilder.prototype._advance = function () {
        var prev = this._peek;
        if (this._index < this.tokens.length - 1) {
            // Note: there is always an EOF token at the end
            this._index++;
        }
        this._peek = this.tokens[this._index];
        return prev;
    };
    _TreeBuilder.prototype._advanceIf = function (type) {
        if (this._peek.type === type) {
            return this._advance();
        }
        return null;
    };
    _TreeBuilder.prototype._consumeCdata = function (startToken) {
        this._consumeText(this._advance());
        this._advanceIf(lex.TokenType.CDATA_END);
    };
    _TreeBuilder.prototype._consumeComment = function (token) {
        var text = this._advanceIf(lex.TokenType.RAW_TEXT);
        this._advanceIf(lex.TokenType.COMMENT_END);
        var value = text != null ? text.parts[0].trim() : null;
        this._addToParent(new html.Comment(value, token.sourceSpan));
    };
    _TreeBuilder.prototype._consumeExpansion = function (token) {
        var switchValue = this._advance();
        var type = this._advance();
        var cases = [];
        // read =
        while (this._peek.type === lex.TokenType.EXPANSION_CASE_VALUE) {
            var expCase = this._parseExpansionCase();
            if (!expCase)
                return; // error
            cases.push(expCase);
        }
        // read the final }
        if (this._peek.type !== lex.TokenType.EXPANSION_FORM_END) {
            this._errors.push(TreeError.create(null, this._peek.sourceSpan, "Invalid ICU message. Missing '}'."));
            return;
        }
        var sourceSpan = new ParseSourceSpan(token.sourceSpan.start, this._peek.sourceSpan.end);
        this._addToParent(new html.Expansion(switchValue.parts[0], type.parts[0], cases, sourceSpan, switchValue.sourceSpan));
        this._advance();
    };
    _TreeBuilder.prototype._parseExpansionCase = function () {
        var value = this._advance();
        // read {
        if (this._peek.type !== lex.TokenType.EXPANSION_CASE_EXP_START) {
            this._errors.push(TreeError.create(null, this._peek.sourceSpan, "Invalid ICU message. Missing '{'."));
            return null;
        }
        // read until }
        var start = this._advance();
        var exp = this._collectExpansionExpTokens(start);
        if (!exp)
            return null;
        var end = this._advance();
        exp.push(new lex.Token(lex.TokenType.EOF, [], end.sourceSpan));
        // parse everything in between { and }
        var parsedExp = new _TreeBuilder(exp, this.getTagDefinition).build();
        if (parsedExp.errors.length > 0) {
            this._errors = this._errors.concat(parsedExp.errors);
            return null;
        }
        var sourceSpan = new ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end);
        var expSourceSpan = new ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end);
        return new html.ExpansionCase(value.parts[0], parsedExp.rootNodes, sourceSpan, value.sourceSpan, expSourceSpan);
    };
    _TreeBuilder.prototype._collectExpansionExpTokens = function (start) {
        var exp = [];
        var expansionFormStack = [lex.TokenType.EXPANSION_CASE_EXP_START];
        while (true) {
            if (this._peek.type === lex.TokenType.EXPANSION_FORM_START ||
                this._peek.type === lex.TokenType.EXPANSION_CASE_EXP_START) {
                expansionFormStack.push(this._peek.type);
            }
            if (this._peek.type === lex.TokenType.EXPANSION_CASE_EXP_END) {
                if (lastOnStack(expansionFormStack, lex.TokenType.EXPANSION_CASE_EXP_START)) {
                    expansionFormStack.pop();
                    if (expansionFormStack.length == 0)
                        return exp;
                }
                else {
                    this._errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'."));
                    return null;
                }
            }
            if (this._peek.type === lex.TokenType.EXPANSION_FORM_END) {
                if (lastOnStack(expansionFormStack, lex.TokenType.EXPANSION_FORM_START)) {
                    expansionFormStack.pop();
                }
                else {
                    this._errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'."));
                    return null;
                }
            }
            if (this._peek.type === lex.TokenType.EOF) {
                this._errors.push(TreeError.create(null, start.sourceSpan, "Invalid ICU message. Missing '}'."));
                return null;
            }
            exp.push(this._advance());
        }
    };
    _TreeBuilder.prototype._consumeText = function (token) {
        var text = token.parts[0];
        if (text.length > 0 && text[0] == '\n') {
            var parent_1 = this._getParentElement();
            if (parent_1 != null && parent_1.children.length == 0 &&
                this.getTagDefinition(parent_1.name).ignoreFirstLf) {
                text = text.substring(1);
            }
        }
        if (text.length > 0) {
            this._addToParent(new html.Text(text, token.sourceSpan));
        }
    };
    _TreeBuilder.prototype._closeVoidElement = function () {
        var el = this._getParentElement();
        if (el && this.getTagDefinition(el.name).isVoid) {
            this._elementStack.pop();
        }
    };
    _TreeBuilder.prototype._consumeStartTag = function (startTagToken) {
        var prefix = startTagToken.parts[0];
        var name = startTagToken.parts[1];
        var attrs = [];
        while (this._peek.type === lex.TokenType.ATTR_NAME) {
            attrs.push(this._consumeAttr(this._advance()));
        }
        var fullName = this._getElementFullName(prefix, name, this._getParentElement());
        var selfClosing = false;
        // Note: There could have been a tokenizer error
        // so that we don't get a token for the end tag...
        if (this._peek.type === lex.TokenType.TAG_OPEN_END_VOID) {
            this._advance();
            selfClosing = true;
            var tagDef = this.getTagDefinition(fullName);
            if (!(tagDef.canSelfClose || getNsPrefix(fullName) !== null || tagDef.isVoid)) {
                this._errors.push(TreeError.create(fullName, startTagToken.sourceSpan, "Only void and foreign elements can be self closed \"" + startTagToken.parts[1] + "\""));
            }
        }
        else if (this._peek.type === lex.TokenType.TAG_OPEN_END) {
            this._advance();
            selfClosing = false;
        }
        var end = this._peek.sourceSpan.start;
        var span = new ParseSourceSpan(startTagToken.sourceSpan.start, end);
        var el = new html.Element(fullName, attrs, [], span, span, undefined);
        this._pushElement(el);
        if (selfClosing) {
            this._popElement(fullName);
            el.endSourceSpan = span;
        }
    };
    _TreeBuilder.prototype._pushElement = function (el) {
        var parentEl = this._getParentElement();
        if (parentEl && this.getTagDefinition(parentEl.name).isClosedByChild(el.name)) {
            this._elementStack.pop();
        }
        this._addToParent(el);
        this._elementStack.push(el);
    };
    _TreeBuilder.prototype._consumeEndTag = function (endTagToken) {
        var fullName = this._getElementFullName(endTagToken.parts[0], endTagToken.parts[1], this._getParentElement());
        if (this._getParentElement()) {
            this._getParentElement().endSourceSpan = endTagToken.sourceSpan;
        }
        if (this.getTagDefinition(fullName).isVoid) {
            this._errors.push(TreeError.create(fullName, endTagToken.sourceSpan, "Void elements do not have end tags \"" + endTagToken.parts[1] + "\""));
        }
        else if (!this._popElement(fullName)) {
            var errMsg = "Unexpected closing tag \"" + fullName + "\". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags";
            this._errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg));
        }
    };
    _TreeBuilder.prototype._popElement = function (fullName) {
        for (var stackIndex = this._elementStack.length - 1; stackIndex >= 0; stackIndex--) {
            var el = this._elementStack[stackIndex];
            if (el.name == fullName) {
                this._elementStack.splice(stackIndex, this._elementStack.length - stackIndex);
                return true;
            }
            if (!this.getTagDefinition(el.name).closedByParent) {
                return false;
            }
        }
        return false;
    };
    _TreeBuilder.prototype._consumeAttr = function (attrName) {
        var fullName = mergeNsAndName(attrName.parts[0], attrName.parts[1]);
        var end = attrName.sourceSpan.end;
        var value = '';
        var valueSpan = undefined;
        if (this._peek.type === lex.TokenType.ATTR_QUOTE) {
            this._advance();
        }
        if (this._peek.type === lex.TokenType.ATTR_VALUE) {
            var valueToken = this._advance();
            value = valueToken.parts[0];
            end = valueToken.sourceSpan.end;
            valueSpan = valueToken.sourceSpan;
        }
        if (this._peek.type === lex.TokenType.ATTR_QUOTE) {
            var quoteToken = this._advance();
            end = quoteToken.sourceSpan.end;
        }
        return new html.Attribute(fullName, value, new ParseSourceSpan(attrName.sourceSpan.start, end), valueSpan);
    };
    _TreeBuilder.prototype._getParentElement = function () {
        return this._elementStack.length > 0 ? this._elementStack[this._elementStack.length - 1] : null;
    };
    /**
     * Returns the parent in the DOM and the container.
     *
     * `<ng-container>` elements are skipped as they are not rendered as DOM element.
     */
    _TreeBuilder.prototype._getParentElementSkippingContainers = function () {
        var container = null;
        for (var i = this._elementStack.length - 1; i >= 0; i--) {
            if (!isNgContainer(this._elementStack[i].name)) {
                return { parent: this._elementStack[i], container: container };
            }
            container = this._elementStack[i];
        }
        return { parent: null, container: container };
    };
    _TreeBuilder.prototype._addToParent = function (node) {
        var parent = this._getParentElement();
        if (parent != null) {
            parent.children.push(node);
        }
        else {
            this._rootNodes.push(node);
        }
    };
    /**
     * Insert a node between the parent and the container.
     * When no container is given, the node is appended as a child of the parent.
     * Also updates the element stack accordingly.
     *
     * @internal
     */
    _TreeBuilder.prototype._insertBeforeContainer = function (parent, container, node) {
        if (!container) {
            this._addToParent(node);
            this._elementStack.push(node);
        }
        else {
            if (parent) {
                // replace the container with the new node in the children
                var index = parent.children.indexOf(container);
                parent.children[index] = node;
            }
            else {
                this._rootNodes.push(node);
            }
            node.children.push(container);
            this._elementStack.splice(this._elementStack.indexOf(container), 0, node);
        }
    };
    _TreeBuilder.prototype._getElementFullName = function (prefix, localName, parentElement) {
        if (prefix === '') {
            prefix = this.getTagDefinition(localName).implicitNamespacePrefix || '';
            if (prefix === '' && parentElement != null) {
                prefix = getNsPrefix(parentElement.name);
            }
        }
        return mergeNsAndName(prefix, localName);
    };
    return _TreeBuilder;
}());
function lastOnStack(stack, element) {
    return stack.length > 0 && stack[stack.length - 1] === element;
}
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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 {ParseError, ParseSourceSpan} from '../parse_util';\n\nimport * as html from './ast';\nimport * as lex from './lexer';\nimport {TagDefinition, getNsPrefix, isNgContainer, mergeNsAndName} from './tags';\n\nexport class TreeError extends ParseError {\n  static create(elementName: string|null, span: ParseSourceSpan, msg: string): TreeError {\n    return new TreeError(elementName, span, msg);\n  }\n\n  constructor(public elementName: string|null, span: ParseSourceSpan, msg: string) {\n    super(span, msg);\n  }\n}\n\nexport class ParseTreeResult {\n  constructor(public rootNodes: html.Node[], public errors: ParseError[]) {}\n}\n\nexport class Parser {\n  constructor(public getTagDefinition: (tagName: string) => TagDefinition) {}\n\n  parse(source: string, url: string, options?: lex.TokenizeOptions): ParseTreeResult {\n    const tokensAndErrors = lex.tokenize(source, url, this.getTagDefinition, options);\n\n    const treeAndErrors = new _TreeBuilder(tokensAndErrors.tokens, this.getTagDefinition).build();\n\n    return new ParseTreeResult(\n        treeAndErrors.rootNodes,\n        (<ParseError[]>tokensAndErrors.errors).concat(treeAndErrors.errors));\n  }\n}\n\nclass _TreeBuilder {\n  private _index: number = -1;\n  // TODO(issue/24571): remove '!'.\n  private _peek !: lex.Token;\n\n  private _rootNodes: html.Node[] = [];\n  private _errors: TreeError[] = [];\n\n  private _elementStack: html.Element[] = [];\n\n  constructor(\n      private tokens: lex.Token[], private getTagDefinition: (tagName: string) => TagDefinition) {\n    this._advance();\n  }\n\n  build(): ParseTreeResult {\n    while (this._peek.type !== lex.TokenType.EOF) {\n      if (this._peek.type === lex.TokenType.TAG_OPEN_START) {\n        this._consumeStartTag(this._advance());\n      } else if (this._peek.type === lex.TokenType.TAG_CLOSE) {\n        this._consumeEndTag(this._advance());\n      } else if (this._peek.type === lex.TokenType.CDATA_START) {\n        this._closeVoidElement();\n        this._consumeCdata(this._advance());\n      } else if (this._peek.type === lex.TokenType.COMMENT_START) {\n        this._closeVoidElement();\n        this._consumeComment(this._advance());\n      } else if (\n          this._peek.type === lex.TokenType.TEXT || this._peek.type === lex.TokenType.RAW_TEXT ||\n          this._peek.type === lex.TokenType.ESCAPABLE_RAW_TEXT) {\n        this._closeVoidElement();\n        this._consumeText(this._advance());\n      } else if (this._peek.type === lex.TokenType.EXPANSION_FORM_START) {\n        this._consumeExpansion(this._advance());\n      } else {\n        // Skip all other tokens...\n        this._advance();\n      }\n    }\n    return new ParseTreeResult(this._rootNodes, this._errors);\n  }\n\n  private _advance(): lex.Token {\n    const prev = this._peek;\n    if (this._index < this.tokens.length - 1) {\n      // Note: there is always an EOF token at the end\n      this._index++;\n    }\n    this._peek = this.tokens[this._index];\n    return prev;\n  }\n\n  private _advanceIf(type: lex.TokenType): lex.Token|null {\n    if (this._peek.type === type) {\n      return this._advance();\n    }\n    return null;\n  }\n\n  private _consumeCdata(startToken: lex.Token) {\n    this._consumeText(this._advance());\n    this._advanceIf(lex.TokenType.CDATA_END);\n  }\n\n  private _consumeComment(token: lex.Token) {\n    const text = this._advanceIf(lex.TokenType.RAW_TEXT);\n    this._advanceIf(lex.TokenType.COMMENT_END);\n    const value = text != null ? text.parts[0].trim() : null;\n    this._addToParent(new html.Comment(value, token.sourceSpan));\n  }\n\n  private _consumeExpansion(token: lex.Token) {\n    const switchValue = this._advance();\n\n    const type = this._advance();\n    const cases: html.ExpansionCase[] = [];\n\n    // read =\n    while (this._peek.type === lex.TokenType.EXPANSION_CASE_VALUE) {\n      const expCase = this._parseExpansionCase();\n      if (!expCase) return;  // error\n      cases.push(expCase);\n    }\n\n    // read the final }\n    if (this._peek.type !== lex.TokenType.EXPANSION_FORM_END) {\n      this._errors.push(\n          TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '}'.`));\n      return;\n    }\n    const sourceSpan = new ParseSourceSpan(token.sourceSpan.start, this._peek.sourceSpan.end);\n    this._addToParent(new html.Expansion(\n        switchValue.parts[0], type.parts[0], cases, sourceSpan, switchValue.sourceSpan));\n\n    this._advance();\n  }\n\n  private _parseExpansionCase(): html.ExpansionCase|null {\n    const value = this._advance();\n\n    // read {\n    if (this._peek.type !== lex.TokenType.EXPANSION_CASE_EXP_START) {\n      this._errors.push(\n          TreeError.create(null, this._peek.sourceSpan, `Invalid ICU message. Missing '{'.`));\n      return null;\n    }\n\n    // read until }\n    const start = this._advance();\n\n    const exp = this._collectExpansionExpTokens(start);\n    if (!exp) return null;\n\n    const end = this._advance();\n    exp.push(new lex.Token(lex.TokenType.EOF, [], end.sourceSpan));\n\n    // parse everything in between { and }\n    const parsedExp = new _TreeBuilder(exp, this.getTagDefinition).build();\n    if (parsedExp.errors.length > 0) {\n      this._errors = this._errors.concat(<TreeError[]>parsedExp.errors);\n      return null;\n    }\n\n    const sourceSpan = new ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end);\n    const expSourceSpan = new ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end);\n    return new html.ExpansionCase(\n        value.parts[0], parsedExp.rootNodes, sourceSpan, value.sourceSpan, expSourceSpan);\n  }\n\n  private _collectExpansionExpTokens(start: lex.Token): lex.Token[]|null {\n    const exp: lex.Token[] = [];\n    const expansionFormStack = [lex.TokenType.EXPANSION_CASE_EXP_START];\n\n    while (true) {\n      if (this._peek.type === lex.TokenType.EXPANSION_FORM_START ||\n          this._peek.type === lex.TokenType.EXPANSION_CASE_EXP_START) {\n        expansionFormStack.push(this._peek.type);\n      }\n\n      if (this._peek.type === lex.TokenType.EXPANSION_CASE_EXP_END) {\n        if (lastOnStack(expansionFormStack, lex.TokenType.EXPANSION_CASE_EXP_START)) {\n          expansionFormStack.pop();\n          if (expansionFormStack.length == 0) return exp;\n\n        } else {\n          this._errors.push(\n              TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n          return null;\n        }\n      }\n\n      if (this._peek.type === lex.TokenType.EXPANSION_FORM_END) {\n        if (lastOnStack(expansionFormStack, lex.TokenType.EXPANSION_FORM_START)) {\n          expansionFormStack.pop();\n        } else {\n          this._errors.push(\n              TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n          return null;\n        }\n      }\n\n      if (this._peek.type === lex.TokenType.EOF) {\n        this._errors.push(\n            TreeError.create(null, start.sourceSpan, `Invalid ICU message. Missing '}'.`));\n        return null;\n      }\n\n      exp.push(this._advance());\n    }\n  }\n\n  private _consumeText(token: lex.Token) {\n    let text = token.parts[0];\n    if (text.length > 0 && text[0] == '\\n') {\n      const parent = this._getParentElement();\n      if (parent != null && parent.children.length == 0 &&\n          this.getTagDefinition(parent.name).ignoreFirstLf) {\n        text = text.substring(1);\n      }\n    }\n\n    if (text.length > 0) {\n      this._addToParent(new html.Text(text, token.sourceSpan));\n    }\n  }\n\n  private _closeVoidElement(): void {\n    const el = this._getParentElement();\n    if (el && this.getTagDefinition(el.name).isVoid) {\n      this._elementStack.pop();\n    }\n  }\n\n  private _consumeStartTag(startTagToken: lex.Token) {\n    const prefix = startTagToken.parts[0];\n    const name = startTagToken.parts[1];\n    const attrs: html.Attribute[] = [];\n    while (this._peek.type === lex.TokenType.ATTR_NAME) {\n      attrs.push(this._consumeAttr(this._advance()));\n    }\n    const fullName = this._getElementFullName(prefix, name, this._getParentElement());\n    let selfClosing = false;\n    // Note: There could have been a tokenizer error\n    // so that we don't get a token for the end tag...\n    if (this._peek.type === lex.TokenType.TAG_OPEN_END_VOID) {\n      this._advance();\n      selfClosing = true;\n      const tagDef = this.getTagDefinition(fullName);\n      if (!(tagDef.canSelfClose || getNsPrefix(fullName) !== null || tagDef.isVoid)) {\n        this._errors.push(TreeError.create(\n            fullName, startTagToken.sourceSpan,\n            `Only void and foreign elements can be self closed \"${startTagToken.parts[1]}\"`));\n      }\n    } else if (this._peek.type === lex.TokenType.TAG_OPEN_END) {\n      this._advance();\n      selfClosing = false;\n    }\n    const end = this._peek.sourceSpan.start;\n    const span = new ParseSourceSpan(startTagToken.sourceSpan.start, end);\n    const el = new html.Element(fullName, attrs, [], span, span, undefined);\n    this._pushElement(el);\n    if (selfClosing) {\n      this._popElement(fullName);\n      el.endSourceSpan = span;\n    }\n  }\n\n  private _pushElement(el: html.Element) {\n    const parentEl = this._getParentElement();\n\n    if (parentEl && this.getTagDefinition(parentEl.name).isClosedByChild(el.name)) {\n      this._elementStack.pop();\n    }\n\n    this._addToParent(el);\n    this._elementStack.push(el);\n  }\n\n  private _consumeEndTag(endTagToken: lex.Token) {\n    const fullName = this._getElementFullName(\n        endTagToken.parts[0], endTagToken.parts[1], this._getParentElement());\n\n    if (this._getParentElement()) {\n      this._getParentElement() !.endSourceSpan = endTagToken.sourceSpan;\n    }\n\n    if (this.getTagDefinition(fullName).isVoid) {\n      this._errors.push(TreeError.create(\n          fullName, endTagToken.sourceSpan,\n          `Void elements do not have end tags \"${endTagToken.parts[1]}\"`));\n    } else if (!this._popElement(fullName)) {\n      const errMsg =\n          `Unexpected closing tag \"${fullName}\". It may happen when the tag has already been closed by another tag. For more info see https://www.w3.org/TR/html5/syntax.html#closing-elements-that-have-implied-end-tags`;\n      this._errors.push(TreeError.create(fullName, endTagToken.sourceSpan, errMsg));\n    }\n  }\n\n  private _popElement(fullName: string): boolean {\n    for (let stackIndex = this._elementStack.length - 1; stackIndex >= 0; stackIndex--) {\n      const el = this._elementStack[stackIndex];\n      if (el.name == fullName) {\n        this._elementStack.splice(stackIndex, this._elementStack.length - stackIndex);\n        return true;\n      }\n\n      if (!this.getTagDefinition(el.name).closedByParent) {\n        return false;\n      }\n    }\n    return false;\n  }\n\n  private _consumeAttr(attrName: lex.Token): html.Attribute {\n    const fullName = mergeNsAndName(attrName.parts[0], attrName.parts[1]);\n    let end = attrName.sourceSpan.end;\n    let value = '';\n    let valueSpan: ParseSourceSpan = undefined !;\n    if (this._peek.type === lex.TokenType.ATTR_QUOTE) {\n      this._advance();\n    }\n    if (this._peek.type === lex.TokenType.ATTR_VALUE) {\n      const valueToken = this._advance();\n      value = valueToken.parts[0];\n      end = valueToken.sourceSpan.end;\n      valueSpan = valueToken.sourceSpan;\n    }\n    if (this._peek.type === lex.TokenType.ATTR_QUOTE) {\n      const quoteToken = this._advance();\n      end = quoteToken.sourceSpan.end;\n    }\n    return new html.Attribute(\n        fullName, value, new ParseSourceSpan(attrName.sourceSpan.start, end), valueSpan);\n  }\n\n  private _getParentElement(): html.Element|null {\n    return this._elementStack.length > 0 ? this._elementStack[this._elementStack.length - 1] : null;\n  }\n\n  /**\n   * Returns the parent in the DOM and the container.\n   *\n   * `<ng-container>` elements are skipped as they are not rendered as DOM element.\n   */\n  private _getParentElementSkippingContainers():\n      {parent: html.Element | null, container: html.Element|null} {\n    let container: html.Element|null = null;\n\n    for (let i = this._elementStack.length - 1; i >= 0; i--) {\n      if (!isNgContainer(this._elementStack[i].name)) {\n        return {parent: this._elementStack[i], container};\n      }\n      container = this._elementStack[i];\n    }\n\n    return {parent: null, container};\n  }\n\n  private _addToParent(node: html.Node) {\n    const parent = this._getParentElement();\n    if (parent != null) {\n      parent.children.push(node);\n    } else {\n      this._rootNodes.push(node);\n    }\n  }\n\n  /**\n   * Insert a node between the parent and the container.\n   * When no container is given, the node is appended as a child of the parent.\n   * Also updates the element stack accordingly.\n   *\n   * @internal\n   */\n  private _insertBeforeContainer(\n      parent: html.Element, container: html.Element|null, node: html.Element) {\n    if (!container) {\n      this._addToParent(node);\n      this._elementStack.push(node);\n    } else {\n      if (parent) {\n        // replace the container with the new node in the children\n        const index = parent.children.indexOf(container);\n        parent.children[index] = node;\n      } else {\n        this._rootNodes.push(node);\n      }\n      node.children.push(container);\n      this._elementStack.splice(this._elementStack.indexOf(container), 0, node);\n    }\n  }\n\n  private _getElementFullName(prefix: string, localName: string, parentElement: html.Element|null):\n      string {\n    if (prefix === '') {\n      prefix = this.getTagDefinition(localName).implicitNamespacePrefix || '';\n      if (prefix === '' && parentElement != null) {\n        prefix = getNsPrefix(parentElement.name);\n      }\n    }\n\n    return mergeNsAndName(prefix, localName);\n  }\n}\n\nfunction lastOnStack(stack: any[], element: any): boolean {\n  return stack.length > 0 && stack[stack.length - 1] === element;\n}\n"]}