65 lines
1.3 KiB
Plaintext
65 lines
1.3 KiB
Plaintext
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const VALUES_REG = /,(?![^\(]*\))/
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const PARTS_REG = /\s(?![^(]*\))/
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const LENGTH_REG = /^[0-9]+[a-zA-Z%]+?$/
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const parseValue = str => {
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const parts = str.split(PARTS_REG)
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const inset = parts.includes('inset')
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const last = parts.slice(-1)[0]
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const color = !isLength(last) ? last : undefined
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const nums = parts
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.filter(n => n !== 'inset')
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.filter(n => n !== color)
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.map(toNum)
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const [ offsetX, offsetY, blurRadius, spreadRadius ] = nums
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return {
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inset,
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offsetX,
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offsetY,
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blurRadius,
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spreadRadius,
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color
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}
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}
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const stringifyValue = obj => {
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const {
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inset,
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offsetX = 0,
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offsetY = 0,
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blurRadius = 0,
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spreadRadius,
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color
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} = obj || {}
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return [
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(inset ? 'inset' : null),
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offsetX,
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offsetY,
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blurRadius ,
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spreadRadius,
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color
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].filter(v => v !== null && v !== undefined)
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.map(toPx)
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.map(s => ('' + s).trim())
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.join(' ')
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}
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const isLength = v => v === '0' || LENGTH_REG.test(v)
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const toNum = v => {
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if (!/px$/.test(v) && v !== '0') return v
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const n = parseFloat(v)
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return !isNaN(n) ? n : v
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}
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const toPx = n => typeof n === 'number' && n !== 0 ? (n + 'px') : n
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const parse = str => str.split(VALUES_REG).map(s => s.trim()).map(parseValue)
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const stringify = arr => arr.map(stringifyValue).join(', ')
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module.exports = {
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parse,
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stringify
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}
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