46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
const diversify = (prefix, now, ...rest) =>
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now
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? now.split(/, */g).map(current => diversify(prefix+' '+current, ...rest)).join(",")
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: prefix
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const keyToPropName = key => key.replace(/^[A-Z]/, a => "-"+a).replace(/[A-Z]/g, a => '-'+a.toLowerCase())
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const walkStyles = (styles, trail=[], buffer=[]) => {
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let inner
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const position = buffer.push(undefined)-1
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Object.entries(styles).forEach(([name, children]) => {
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if (children.constructor.name === "Object") {
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trail.push(name)
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walkStyles(children, trail, buffer)
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trail.pop()
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} else {
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inner ||= []
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const rules = Array.isArray(children)
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? children.map(e => Array.isArray(e) ? e.map(e => e.toString()).join(' ') : e.toString()).join(", ")
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: children.toString()
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inner.push(`${keyToPropName(name)}: ${children}`)
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}
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})
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if (inner) buffer[position] = (`${diversify("", ...trail)} {${inner.join("; ")}}`)
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return buffer
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}
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export const css = (styles) => walkStyles(styles).filter(e=>e).join("\n")
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export const style = styles => {
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const style = document.createElement("style")
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style.innerHTML = css(styles)
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return style
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}
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const mkVar = name => {
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const v = (def) => `var(--${name}, ${def})`
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v.toString = () => `var(--${name})`
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return v
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}
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export const v = new Proxy(Window, {
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get: (target, name, receiver) => mkVar(name),
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apply: (target, object, [name]) => `var(--${keyToPropName(name)})`,
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})
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