50 lines
1.5 KiB
JavaScript
50 lines
1.5 KiB
JavaScript
import { isBool, isNil } from "./lang.mjs";
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import { Elem, TextNode } from "./nodes.mjs";
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export class StrRenderer {
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async render(node) {
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return encodeNode(await node);
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}
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}
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async function encodeAnyNode(node) {
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const syncNode = await node;
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return !syncNode
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? null
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: syncNode instanceof TextNode
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? encodeTextNode(syncNode)
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: encodeNode(syncNode);
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}
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function encodeTextNode(node) {
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return String(node);
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}
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async function encodeNode(node) {
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const encodedChildren = isNil(node.children)
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? undefined
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: await Promise.all(node.children.map(encodeAnyNode)).then((children) => children.filter((c) => Boolean(c)));
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return node instanceof Elem
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? encodeHtmlElement(node.tagName, node.attrs, encodedChildren)
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: encodeHtmlFragment(encodedChildren);
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}
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function encodeHtmlFragment(children) {
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return children?.join("") ?? "";
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}
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function encodeHtmlElement(tagName, attrs, children) {
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const open = `<${tagName} ${encodeAttrs(attrs)}>`;
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if (isNil(children))
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return open;
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return `${open}${children.join("")}</${tagName}>`;
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}
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function encodeAttrs(attrs) {
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if (!attrs)
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return "";
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return Object.entries(attrs)
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.map(([key, value]) => encodeAttr(key, value))
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.filter(Boolean)
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.join(" ");
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}
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function encodeAttr(key, value) {
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if (isNil(value))
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return null;
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if (isBool(value))
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return value ? key : null;
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return `${key}="${value}"`;
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}
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