setup-python/node_modules/parse5/lib/parser/open_element_stack.js
Danny McCormick 39c08a0eaa Initial pass
2019-06-26 21:12:00 -04:00

396 lines
11 KiB
JavaScript

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