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index.js
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Wed, Jan 8, 14:00

index.js
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/*
* Module dependencies
*/
import * as ElementType from "domelementtype";
import { encodeXML, escapeAttribute, escapeText } from "entities";
/**
* Mixed-case SVG and MathML tags & attributes
* recognized by the HTML parser.
*
* @see https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inforeign
*/
import { elementNames, attributeNames } from "./foreignNames.js";
const unencodedElements = new Set([
"style",
"script",
"xmp",
"iframe",
"noembed",
"noframes",
"plaintext",
"noscript",
]);
function replaceQuotes(value) {
return value.replace(/"/g, """);
}
/**
* Format attributes
*/
function formatAttributes(attributes, opts) {
var _a;
if (!attributes)
return;
const encode = ((_a = opts.encodeEntities) !== null && _a !== void 0 ? _a : opts.decodeEntities) === false
? replaceQuotes
: opts.xmlMode || opts.encodeEntities !== "utf8"
? encodeXML
: escapeAttribute;
return Object.keys(attributes)
.map((key) => {
var _a, _b;
const value = (_a = attributes[key]) !== null && _a !== void 0 ? _a : "";
if (opts.xmlMode === "foreign") {
/* Fix up mixed-case attribute names */
key = (_b = attributeNames.get(key)) !== null && _b !== void 0 ? _b : key;
}
if (!opts.emptyAttrs && !opts.xmlMode && value === "") {
return key;
}
return `${key}="${encode(value)}"`;
})
.join(" ");
}
/**
* Self-enclosing tags
*/
const singleTag = new Set([
"area",
"base",
"basefont",
"br",
"col",
"command",
"embed",
"frame",
"hr",
"img",
"input",
"isindex",
"keygen",
"link",
"meta",
"param",
"source",
"track",
"wbr",
]);
/**
* Renders a DOM node or an array of DOM nodes to a string.
*
* Can be thought of as the equivalent of the `outerHTML` of the passed node(s).
*
* @param node Node to be rendered.
* @param options Changes serialization behavior
*/
export function render(node, options = {}) {
const nodes = "length" in node ? node : [node];
let output = "";
for (let i = 0; i < nodes.length; i++) {
output += renderNode(nodes[i], options);
}
return output;
}
export default render;
function renderNode(node, options) {
switch (node.type) {
case ElementType.Root:
return render(node.children, options);
// @ts-expect-error We don't use `Doctype` yet
case ElementType.Doctype:
case ElementType.Directive:
return renderDirective(node);
case ElementType.Comment:
return renderComment(node);
case ElementType.CDATA:
return renderCdata(node);
case ElementType.Script:
case ElementType.Style:
case ElementType.Tag:
return renderTag(node, options);
case ElementType.Text:
return renderText(node, options);
}
}
const foreignModeIntegrationPoints = new Set([
"mi",
"mo",
"mn",
"ms",
"mtext",
"annotation-xml",
"foreignObject",
"desc",
"title",
]);
const foreignElements = new Set(["svg", "math"]);
function renderTag(elem, opts) {
var _a;
// Handle SVG / MathML in HTML
if (opts.xmlMode === "foreign") {
/* Fix up mixed-case element names */
elem.name = (_a = elementNames.get(elem.name)) !== null && _a !== void 0 ? _a : elem.name;
/* Exit foreign mode at integration points */
if (elem.parent &&
foreignModeIntegrationPoints.has(elem.parent.name)) {
opts = { ...opts, xmlMode: false };
}
}
if (!opts.xmlMode && foreignElements.has(elem.name)) {
opts = { ...opts, xmlMode: "foreign" };
}
let tag = `<${elem.name}`;
const attribs = formatAttributes(elem.attribs, opts);
if (attribs) {
tag += ` ${attribs}`;
}
if (elem.children.length === 0 &&
(opts.xmlMode
? // In XML mode or foreign mode, and user hasn't explicitly turned off self-closing tags
opts.selfClosingTags !== false
: // User explicitly asked for self-closing tags, even in HTML mode
opts.selfClosingTags && singleTag.has(elem.name))) {
if (!opts.xmlMode)
tag += " ";
tag += "/>";
}
else {
tag += ">";
if (elem.children.length > 0) {
tag += render(elem.children, opts);
}
if (opts.xmlMode || !singleTag.has(elem.name)) {
tag += `</${elem.name}>`;
}
}
return tag;
}
function renderDirective(elem) {
return `<${elem.data}>`;
}
function renderText(elem, opts) {
var _a;
let data = elem.data || "";
// If entities weren't decoded, no need to encode them back
if (((_a = opts.encodeEntities) !== null && _a !== void 0 ? _a : opts.decodeEntities) !== false &&
!(!opts.xmlMode &&
elem.parent &&
unencodedElements.has(elem.parent.name))) {
data =
opts.xmlMode || opts.encodeEntities !== "utf8"
? encodeXML(data)
: escapeText(data);
}
return data;
}
function renderCdata(elem) {
return `<![CDATA[${elem.children[0].data}]]>`;
}
function renderComment(elem) {
return `<!--${elem.data}-->`;
}

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