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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 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: Node[]
): Element {
return {
kind: "element",
name,
attributes: 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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