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106 lines
2.6 KiB
TypeScript
106 lines
2.6 KiB
TypeScript
import { Color } from '../../color';
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import { Length, LengthType, zeroLength } from './style-properties';
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export interface CSSShadow {
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inset: boolean;
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offsetX: LengthType;
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offsetY: LengthType;
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blurRadius?: LengthType;
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spreadRadius?: LengthType;
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color: Color;
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}
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/**
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* Matches whitespace except if the whitespace is contained in parenthesis - ex. rgb(a), hsl color.
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*/
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const PARTS_RE = /\s(?![^(]*\))/;
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/**
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* Matches a Length value with or without a unit
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*/
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const LENGTH_RE = /^-?[0-9]+[a-zA-Z%]*?$/;
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/**
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* Checks if the value is a Length or 0
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*/
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const isLength = (v) => v === '0' || LENGTH_RE.test(v);
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/**
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* Parse a string into a CSSShadow
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* Supports any valid css box/text shadow combination.
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*
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* inspired by https://github.com/jxnblk/css-box-shadow/blob/master/index.js (MIT License)
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*
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* @param value
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*/
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export function parseCSSShadow(value: string): CSSShadow {
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const parts = value.split(PARTS_RE);
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const inset = parts.includes('inset');
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const first = parts[0];
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const last = parts[parts.length - 1];
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let colorRaw = 'black';
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if (!isLength(first) && first !== 'inset') {
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colorRaw = first;
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} else if (!isLength(last)) {
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colorRaw = last;
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}
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const nums = parts
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.filter((n) => n !== 'inset')
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.filter((n) => n !== colorRaw)
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.map((val) => {
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try {
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return Length.parse(val);
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} catch (err) {
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return zeroLength;
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}
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});
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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: offsetX,
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offsetY: offsetY,
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blurRadius: blurRadius,
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spreadRadius: spreadRadius,
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color: new Color(colorRaw),
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};
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}
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// if (value.indexOf('rgb') > -1) {
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// arr = value.split(' ');
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// colorRaw = arr.pop();
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// } else {
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// arr = value.split(/[ ,]+/);
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// colorRaw = arr.pop();
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// }
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// let offsetX: number;
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// let offsetY: number;
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// let blurRadius: number; // not currently in use
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// let spreadRadius: number; // maybe rename this to just radius
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// let color: Color = new Color(colorRaw);
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// if (arr.length === 2) {
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// offsetX = parseFloat(arr[0]);
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// offsetY = parseFloat(arr[1]);
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// } else if (arr.length === 3) {
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// offsetX = parseFloat(arr[0]);
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// offsetY = parseFloat(arr[1]);
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// blurRadius = parseFloat(arr[2]);
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// } else if (arr.length === 4) {
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// offsetX = parseFloat(arr[0]);
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// offsetY = parseFloat(arr[1]);
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// blurRadius = parseFloat(arr[2]);
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// spreadRadius = parseFloat(arr[3]);
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// } else {
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// throw new Error('Expected 3, 4 or 5 parameters. Actual: ' + value);
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// }
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// return {
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// offsetX: offsetX,
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// offsetY: offsetY,
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// blurRadius: blurRadius,
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// spreadRadius: spreadRadius,
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// color: color,
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// };
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