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export type Text = {
kind: "text";
content: string;
};
export type RawHTML = {
kind: "raw";
html: string;
};
export type Element = {
kind: "element";
name: string;
attributes: Record<string, string>;
children: Node[];
};
export type Node = Element | Text | RawHTML;
export type NodeLike = Node | string | null | undefined | false | NodeLike[];
function flattenChildren(children: NodeLike[]): Node[] {
const result: Node[] = [];
for (const child of children) {
if (child === null || child === undefined || child === false) {
continue;
}
if (typeof child === "string") {
result.push(text(child));
} else if (Array.isArray(child)) {
result.push(...flattenChildren(child));
} else {
result.push(child);
}
}
return result;
}
export function text(content: string): Text {
return {
kind: "text",
content,
};
}
export function rawHTML(html: string): RawHTML {
return {
kind: "raw",
html,
};
}
export function elem(
name: string,
attributes?: Record<string, string>,
...children: NodeLike[]
): Element {
return {
kind: "element",
name,
attributes: attributes || {},
children: flattenChildren(children),
};
}
// Helper functions for commonly used elements
export const a = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("a", attributes, ...children);
export const article = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("article", attributes, ...children);
export const button = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("button", attributes, ...children);
export const div = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("div", attributes, ...children);
export const footer = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("footer", attributes, ...children);
export const h1 = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("h1", attributes, ...children);
export const h2 = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("h2", attributes, ...children);
export const h3 = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("h3", attributes, ...children);
export const h4 = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("h4", attributes, ...children);
export const h5 = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("h5", attributes, ...children);
export const h6 = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("h6", attributes, ...children);
export const header = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("header", attributes, ...children);
export const img = (attributes?: Record<string, string>) =>
elem("img", attributes);
export const li = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("li", attributes, ...children);
export const link = (attributes?: Record<string, string>) =>
elem("link", attributes);
export const meta = (attributes?: Record<string, string>) =>
elem("meta", attributes);
export const nav = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("nav", attributes, ...children);
export const ol = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("ol", attributes, ...children);
export const p = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("p", attributes, ...children);
export const script = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("script", attributes, ...children);
export const section = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("section", attributes, ...children);
export const span = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("span", attributes, ...children);
export const ul = (
attributes?: Record<string, string>,
...children: NodeLike[]
) => elem("ul", attributes, ...children);
export function addClass(e: Element, klass: string) {
const classes = e.attributes.class;
if (classes === undefined) {
e.attributes.class = klass;
} else {
const classList = classes.split(" ");
classList.push(klass);
classList.sort();
e.attributes.class = classList.join(" ");
}
}
export function findFirstChildElement(
e: Element,
name: string,
): Element | null {
for (const c of e.children) {
if (c.kind === "element" && c.name === name) {
return c;
}
}
return null;
}
export function findChildElements(e: Element, name: string): Element[] {
const cs = [];
for (const c of e.children) {
if (c.kind === "element" && c.name === name) {
cs.push(c);
}
}
return cs;
}
export function innerText(e: Element): string {
let t = "";
forEachChild(e, (c) => {
if (c.kind === "text") {
t += c.content;
}
});
return t;
}
export function forEachChild(e: Element, f: (n: Node) => void) {
for (const c of e.children) {
f(c);
}
}
export async function forEachChildAsync(
e: Element,
f: (n: Node) => Promise<void>,
): Promise<void> {
for (const c of e.children) {
await f(c);
}
}
export function forEachChildRecursively(e: Element, f: (n: Node) => void) {
const g = (c: Node) => {
f(c);
if (c.kind === "element") {
forEachChild(c, g);
}
};
forEachChild(e, g);
}
export async function forEachChildRecursivelyAsync(
e: Element,
f: (n: Node) => Promise<void>,
): Promise<void> {
const g = async (c: Node) => {
await f(c);
if (c.kind === "element") {
await forEachChildAsync(c, g);
}
};
await forEachChildAsync(e, g);
}
export function forEachElementOfType(
root: Element,
elementName: string,
f: (e: Element) => void,
) {
forEachChildRecursively(root, (n) => {
if (n.kind === "element" && n.name === elementName) {
f(n);
}
});
}
export function processTextNodesInElement(
e: Element,
f: (text: string) => Node[],
) {
const newChildren: Node[] = [];
for (const child of e.children) {
if (child.kind === "text") {
newChildren.push(...f(child.content));
} else {
newChildren.push(child);
}
}
e.children = newChildren;
}
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