'use strict';
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const HTML = require('../common/html');
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//Aliases
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const $ = HTML.TAG_NAMES;
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const NS = HTML.NAMESPACES;
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//Element utils
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//OPTIMIZATION: Integer comparisons are low-cost, so we can use very fast tag name length filters here.
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//It's faster than using dictionary.
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function isImpliedEndTagRequired(tn) {
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switch (tn.length) {
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case 1:
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return tn === $.P;
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case 2:
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return tn === $.RB || tn === $.RP || tn === $.RT || tn === $.DD || tn === $.DT || tn === $.LI;
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case 3:
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return tn === $.RTC;
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case 6:
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return tn === $.OPTION;
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case 8:
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return tn === $.OPTGROUP;
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}
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return false;
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}
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function isImpliedEndTagRequiredThoroughly(tn) {
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switch (tn.length) {
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case 1:
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return tn === $.P;
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case 2:
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return (
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tn === $.RB ||
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tn === $.RP ||
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tn === $.RT ||
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tn === $.DD ||
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tn === $.DT ||
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tn === $.LI ||
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tn === $.TD ||
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tn === $.TH ||
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tn === $.TR
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);
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case 3:
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return tn === $.RTC;
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case 5:
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return tn === $.TBODY || tn === $.TFOOT || tn === $.THEAD;
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case 6:
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return tn === $.OPTION;
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case 7:
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return tn === $.CAPTION;
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case 8:
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return tn === $.OPTGROUP || tn === $.COLGROUP;
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}
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return false;
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}
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function isScopingElement(tn, ns) {
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switch (tn.length) {
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case 2:
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if (tn === $.TD || tn === $.TH) {
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return ns === NS.HTML;
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} else if (tn === $.MI || tn === $.MO || tn === $.MN || tn === $.MS) {
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return ns === NS.MATHML;
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}
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break;
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case 4:
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if (tn === $.HTML) {
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return ns === NS.HTML;
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} else if (tn === $.DESC) {
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return ns === NS.SVG;
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}
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break;
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case 5:
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if (tn === $.TABLE) {
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return ns === NS.HTML;
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} else if (tn === $.MTEXT) {
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return ns === NS.MATHML;
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} else if (tn === $.TITLE) {
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return ns === NS.SVG;
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}
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break;
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case 6:
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return (tn === $.APPLET || tn === $.OBJECT) && ns === NS.HTML;
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case 7:
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return (tn === $.CAPTION || tn === $.MARQUEE) && ns === NS.HTML;
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case 8:
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return tn === $.TEMPLATE && ns === NS.HTML;
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case 13:
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return tn === $.FOREIGN_OBJECT && ns === NS.SVG;
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case 14:
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return tn === $.ANNOTATION_XML && ns === NS.MATHML;
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}
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return false;
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}
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//Stack of open elements
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class OpenElementStack {
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constructor(document, treeAdapter) {
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this.stackTop = -1;
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this.items = [];
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this.current = document;
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this.currentTagName = null;
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this.currentTmplContent = null;
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this.tmplCount = 0;
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this.treeAdapter = treeAdapter;
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}
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//Index of element
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_indexOf(element) {
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let idx = -1;
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for (let i = this.stackTop; i >= 0; i--) {
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if (this.items[i] === element) {
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idx = i;
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break;
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}
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}
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return idx;
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}
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//Update current element
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_isInTemplate() {
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return this.currentTagName === $.TEMPLATE && this.treeAdapter.getNamespaceURI(this.current) === NS.HTML;
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}
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_updateCurrentElement() {
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this.current = this.items[this.stackTop];
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this.currentTagName = this.current && this.treeAdapter.getTagName(this.current);
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this.currentTmplContent = this._isInTemplate() ? this.treeAdapter.getTemplateContent(this.current) : null;
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}
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//Mutations
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push(element) {
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this.items[++this.stackTop] = element;
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this._updateCurrentElement();
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if (this._isInTemplate()) {
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this.tmplCount++;
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}
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}
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pop() {
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this.stackTop--;
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if (this.tmplCount > 0 && this._isInTemplate()) {
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this.tmplCount--;
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}
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this._updateCurrentElement();
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}
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replace(oldElement, newElement) {
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const idx = this._indexOf(oldElement);
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this.items[idx] = newElement;
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if (idx === this.stackTop) {
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this._updateCurrentElement();
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}
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}
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insertAfter(referenceElement, newElement) {
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const insertionIdx = this._indexOf(referenceElement) + 1;
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this.items.splice(insertionIdx, 0, newElement);
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if (insertionIdx === ++this.stackTop) {
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this._updateCurrentElement();
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}
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}
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popUntilTagNamePopped(tagName) {
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while (this.stackTop > -1) {
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const tn = this.currentTagName;
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const ns = this.treeAdapter.getNamespaceURI(this.current);
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this.pop();
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if (tn === tagName && ns === NS.HTML) {
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break;
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}
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}
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}
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popUntilElementPopped(element) {
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while (this.stackTop > -1) {
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const poppedElement = this.current;
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this.pop();
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if (poppedElement === element) {
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break;
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}
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}
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}
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popUntilNumberedHeaderPopped() {
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while (this.stackTop > -1) {
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const tn = this.currentTagName;
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const ns = this.treeAdapter.getNamespaceURI(this.current);
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this.pop();
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if (
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tn === $.H1 ||
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tn === $.H2 ||
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tn === $.H3 ||
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tn === $.H4 ||
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tn === $.H5 ||
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(tn === $.H6 && ns === NS.HTML)
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) {
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break;
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}
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}
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}
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popUntilTableCellPopped() {
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while (this.stackTop > -1) {
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const tn = this.currentTagName;
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const ns = this.treeAdapter.getNamespaceURI(this.current);
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this.pop();
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if (tn === $.TD || (tn === $.TH && ns === NS.HTML)) {
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break;
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}
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}
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}
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popAllUpToHtmlElement() {
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//NOTE: here we assume that root <html> element is always first in the open element stack, so
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//we perform this fast stack clean up.
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this.stackTop = 0;
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this._updateCurrentElement();
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}
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clearBackToTableContext() {
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while (
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(this.currentTagName !== $.TABLE && this.currentTagName !== $.TEMPLATE && this.currentTagName !== $.HTML) ||
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this.treeAdapter.getNamespaceURI(this.current) !== NS.HTML
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) {
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this.pop();
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}
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}
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clearBackToTableBodyContext() {
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while (
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(this.currentTagName !== $.TBODY &&
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this.currentTagName !== $.TFOOT &&
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this.currentTagName !== $.THEAD &&
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this.currentTagName !== $.TEMPLATE &&
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this.currentTagName !== $.HTML) ||
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this.treeAdapter.getNamespaceURI(this.current) !== NS.HTML
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) {
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this.pop();
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}
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}
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clearBackToTableRowContext() {
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while (
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(this.currentTagName !== $.TR && this.currentTagName !== $.TEMPLATE && this.currentTagName !== $.HTML) ||
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this.treeAdapter.getNamespaceURI(this.current) !== NS.HTML
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) {
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this.pop();
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}
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}
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remove(element) {
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for (let i = this.stackTop; i >= 0; i--) {
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if (this.items[i] === element) {
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this.items.splice(i, 1);
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this.stackTop--;
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this._updateCurrentElement();
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break;
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}
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}
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}
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//Search
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tryPeekProperlyNestedBodyElement() {
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//Properly nested <body> element (should be second element in stack).
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const element = this.items[1];
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return element && this.treeAdapter.getTagName(element) === $.BODY ? element : null;
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}
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contains(element) {
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return this._indexOf(element) > -1;
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}
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getCommonAncestor(element) {
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let elementIdx = this._indexOf(element);
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return --elementIdx >= 0 ? this.items[elementIdx] : null;
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}
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isRootHtmlElementCurrent() {
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return this.stackTop === 0 && this.currentTagName === $.HTML;
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}
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//Element in scope
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hasInScope(tagName) {
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for (let i = this.stackTop; i >= 0; i--) {
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const tn = this.treeAdapter.getTagName(this.items[i]);
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const ns = this.treeAdapter.getNamespaceURI(this.items[i]);
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if (tn === tagName && ns === NS.HTML) {
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return true;
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}
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if (isScopingElement(tn, ns)) {
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return false;
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}
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}
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return true;
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}
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hasNumberedHeaderInScope() {
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for (let i = this.stackTop; i >= 0; i--) {
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const tn = this.treeAdapter.getTagName(this.items[i]);
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const ns = this.treeAdapter.getNamespaceURI(this.items[i]);
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if (
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(tn === $.H1 || tn === $.H2 || tn === $.H3 || tn === $.H4 || tn === $.H5 || tn === $.H6) &&
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ns === NS.HTML
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) {
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return true;
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}
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if (isScopingElement(tn, ns)) {
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return false;
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}
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}
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return true;
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}
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hasInListItemScope(tagName) {
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for (let i = this.stackTop; i >= 0; i--) {
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const tn = this.treeAdapter.getTagName(this.items[i]);
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const ns = this.treeAdapter.getNamespaceURI(this.items[i]);
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if (tn === tagName && ns === NS.HTML) {
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return true;
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}
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if (((tn === $.UL || tn === $.OL) && ns === NS.HTML) || isScopingElement(tn, ns)) {
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return false;
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}
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}
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return true;
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}
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hasInButtonScope(tagName) {
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for (let i = this.stackTop; i >= 0; i--) {
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const tn = this.treeAdapter.getTagName(this.items[i]);
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const ns = this.treeAdapter.getNamespaceURI(this.items[i]);
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if (tn === tagName && ns === NS.HTML) {
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return true;
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}
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if ((tn === $.BUTTON && ns === NS.HTML) || isScopingElement(tn, ns)) {
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return false;
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}
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}
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return true;
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}
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hasInTableScope(tagName) {
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for (let i = this.stackTop; i >= 0; i--) {
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const tn = this.treeAdapter.getTagName(this.items[i]);
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const ns = this.treeAdapter.getNamespaceURI(this.items[i]);
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if (ns !== NS.HTML) {
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continue;
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}
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if (tn === tagName) {
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return true;
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}
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if (tn === $.TABLE || tn === $.TEMPLATE || tn === $.HTML) {
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return false;
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}
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}
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return true;
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}
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hasTableBodyContextInTableScope() {
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for (let i = this.stackTop; i >= 0; i--) {
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const tn = this.treeAdapter.getTagName(this.items[i]);
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const ns = this.treeAdapter.getNamespaceURI(this.items[i]);
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if (ns !== NS.HTML) {
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continue;
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}
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if (tn === $.TBODY || tn === $.THEAD || tn === $.TFOOT) {
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return true;
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}
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if (tn === $.TABLE || tn === $.HTML) {
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return false;
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}
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}
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return true;
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}
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hasInSelectScope(tagName) {
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for (let i = this.stackTop; i >= 0; i--) {
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const tn = this.treeAdapter.getTagName(this.items[i]);
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const ns = this.treeAdapter.getNamespaceURI(this.items[i]);
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if (ns !== NS.HTML) {
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continue;
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}
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if (tn === tagName) {
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return true;
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}
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if (tn !== $.OPTION && tn !== $.OPTGROUP) {
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return false;
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}
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}
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return true;
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}
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//Implied end tags
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generateImpliedEndTags() {
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while (isImpliedEndTagRequired(this.currentTagName)) {
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this.pop();
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}
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}
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generateImpliedEndTagsThoroughly() {
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while (isImpliedEndTagRequiredThoroughly(this.currentTagName)) {
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this.pop();
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}
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}
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generateImpliedEndTagsWithExclusion(exclusionTagName) {
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while (isImpliedEndTagRequired(this.currentTagName) && this.currentTagName !== exclusionTagName) {
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this.pop();
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}
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}
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}
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module.exports = OpenElementStack;
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