thi-ng/umbrella

import { readText } from "@thi.ng/file-io";
import type { CompLayerFn, SVGLayer } from "../api.js";
import { positionOrGravity } from "../units.js";
import { illegalArgs } from "@thi.ng/errors";

export const svgLayerImpl: CompLayerFn = async (layer, _, ctx) => {
    let {
        type: __,
        body,
        gravity,
        origin,
        path,
        pos,
        ref,
        unit,
        ...opts
    } = <SVGLayer>layer;
    if (path) body = readText(path, ctx.logger);
    if (!body) illegalArgs("missing SVG doc");
    const w = +(/width="(\d+)"/.exec(body)?.[1] || 0);
    const h = +(/height="(\d+)"/.exec(body)?.[1] || 0);
    return {
        input: Buffer.from(body),
        ...positionOrGravity([w, h], ctx.size, layer),
        ...opts,
    };
};