Using Observable for software engineering, programming language and user interface research.
Public
Edited
Dec 24, 2022
Importers
ui = () => {
const tokens = {};
return { styled: (_) => styled(_, tokens), component, $, H, icon, tokens };
}
parseToken = (text, context) => {
const res = token(text).eval(context);
return res.color || res.value;
}
styled = (styles, tokens = {}) => {
const res = {};
for (let k in styles) {
const [styledName, tagName] = k.split(":");
const normalizedStyle = Object.entries(styles[k]).reduce(
(r, [k, v]) => {
if (k.startsWith("@") || k.startsWith("&")) {
r[k] = v;
} else {
r["&"][k] = v;
}
return r;
},
{ "&": {} }
);
const s = registerStyle(
style(normalizedStyle, tokens, undefined, parseToken)
);
const n = className(s);
res[styledName] = Object.assign(
(
(styleName, tagName = "div") =>
(...value) => {
const node = H[tagName || "div"](...value);
const klass = node.attributes["class"];
node.attributes["class"] = klass
? `${styleName} ${klass}`
: styleName;
return node;
}
)(n, tagName),
{ className: n }
);
}
return res;
}
registerStyle = (style) => {
const delta = Rules;
for (let k in style) {
if (Styles[k] === undefined) {
Styles[k] = style[k];
compileStyle({ [k]: style[k] }).reduce((r, v) => {
v.startsWith("@") ? r.splice(0, 0, v) : r.push(v);
return r;
}, delta);
}
}
const existing = document.getElementById("stylesheet");
existing?.parentElement.removeChild(existing);
const current = html`<style id="stylesheet">${Rules.join("\n")}</style>`;
document.body.appendChild(current);
return style;
}
Styles = ({})
Rules = []
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