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const BASE_FONT_SIZE = 16
const UNIT_PX = "px"
const UNIT_EM = "em"
const UNIT_REM = "rem"
export function getUnit(value = ""): string | undefined {
const DIGIT_REGEX = new RegExp(String.raw`-?\d+(?:\.\d+|\d*)`)
const UNIT_REGEX = new RegExp(`${UNIT_PX}|${UNIT_EM}|${UNIT_REM}`)
const unit = value.match(
new RegExp(`${DIGIT_REGEX.source}(${UNIT_REGEX.source})`),
)
return unit?.[1]
}
export function toPx(value: string | number = ""): string | undefined {
if (typeof value === "number") {
return `${value}px`
}
const unit = getUnit(value)
if (!unit) return value
if (unit === UNIT_PX) {
return value
}
if (unit === UNIT_EM || unit === UNIT_REM) {
return `${parseFloat(value) * BASE_FONT_SIZE}${UNIT_PX}`
}
}
export function toEm(
value = "",
fontSize = BASE_FONT_SIZE,
): string | undefined {
const unit = getUnit(value)
if (!unit) return value
if (unit === UNIT_EM) {
return value
}
if (unit === UNIT_PX) {
return `${parseFloat(value) / fontSize}${UNIT_EM}`
}
if (unit === UNIT_REM) {
return `${(parseFloat(value) * BASE_FONT_SIZE) / fontSize}${UNIT_EM}`
}
}
export function toRem(value = ""): string | undefined {
const unit = getUnit(value)
if (!unit) return value
if (unit === UNIT_REM) {
return value
}
if (unit === UNIT_EM) {
return `${parseFloat(value)}${UNIT_REM}`
}
if (unit === UNIT_PX) {
return `${parseFloat(value) / BASE_FONT_SIZE}${UNIT_REM}`
}
}
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