@acrodata/gradient-picker
Version:
A powerful and beautiful gradient picker.
79 lines • 11.3 kB
JavaScript
import { resolveColorInterp, resolvePosition, resolveStops, split } from './utils';
const set = new Set(['from', 'in', 'at']);
function resolvePrefix(k, props, start, end) {
switch (k) {
case 'from':
return { angle: props.slice(start, end).join(' ') };
case 'at':
return { position: resolvePosition(props.slice(start, end).join(' ')) };
case 'in': {
const arr = props.slice(start, end);
return {
color: resolveColorInterp(arr.join(' ')),
};
}
default:
return null;
}
}
export function parseConicGradient(input) {
if (!/(repeating-)?conic-gradient/.test(input))
throw new SyntaxError(`could not find syntax for this item: ${input}`);
const [, repeating, props] = input
.replace(/[\n\t]/g, '')
.match(/(repeating-)?conic-gradient\((.+)\)/);
const result = {
repeating: Boolean(repeating),
angle: '0deg',
position: {
x: { type: 'keyword', value: 'center' },
y: { type: 'keyword', value: 'center' },
},
stops: [],
};
const properties = split(props).map(v => v.trim());
const prefix = split(properties[0], /\s+/);
let k = '';
let j = 0;
for (let i = 0, n = prefix.length; i < n; i++) {
if (set.has(prefix[i])) {
if (i > 0) {
Object.assign(result, resolvePrefix(k, prefix, j, i));
}
k = prefix[i];
j = i + 1;
}
}
if (k) {
Object.assign(result, resolvePrefix(k, prefix, j, prefix.length));
properties.shift();
}
return { ...result, stops: resolveStops(properties) };
}
export function stringifyConicGradient(input) {
const { repeating, angle, position, color, stops } = input;
const type = repeating ? 'repeating-conic-gradient' : 'conic-gradient';
const prefixArr = [];
if (angle.trim()) {
prefixArr.push(`from ${angle}`);
}
const posX = position.x.value;
const posY = position.y.value;
const pos = posX.trim() || posY.trim() ? 'at ' + `${posX} ${posY}`.trim() : '';
if (pos) {
prefixArr.push(pos);
}
if (color && color.space) {
prefixArr.push(`in ${color.space} ${color.method || ''}`.trim());
}
const props = [];
if (prefixArr.length > 0) {
props.push(prefixArr.join(' '));
}
const stopsStr = stops
.map(s => `${s.color} ${s.offset?.value}${s.offset?.unit}`.trim())
.join(', ');
props.push(stopsStr);
return `${type}(${props.join(', ')})`;
}
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{ Color, ColorStop, PositionPropertyValue } from './type';\nimport { resolveColorInterp, resolvePosition, resolveStops, split } from './utils';\n\nexport interface ConicGradientResult {\n  repeating: boolean;\n  angle: string;\n  position: {\n    x: PositionPropertyValue;\n    y: PositionPropertyValue;\n  };\n  color?: Color;\n  stops: ColorStop[];\n}\n\nconst set = new Set(['from', 'in', 'at']);\n\nfunction resolvePrefix(k: string, props: string[], start: number, end: number) {\n  switch (k) {\n    case 'from':\n      return { angle: props.slice(start, end).join(' ') };\n    case 'at':\n      return { position: resolvePosition(props.slice(start, end).join(' ')) };\n    case 'in': {\n      const arr = props.slice(start, end);\n      return {\n        color: resolveColorInterp(arr.join(' ')),\n      };\n    }\n    default:\n      return null;\n  }\n}\n\nexport function parseConicGradient(input: string): ConicGradientResult {\n  if (!/(repeating-)?conic-gradient/.test(input))\n    throw new SyntaxError(`could not find syntax for this item: ${input}`);\n\n  const [, repeating, props] = input\n    .replace(/[\\n\\t]/g, '')\n    .match(/(repeating-)?conic-gradient\\((.+)\\)/)!;\n  const result: ConicGradientResult = {\n    repeating: Boolean(repeating),\n    angle: '0deg',\n    position: {\n      x: { type: 'keyword', value: 'center' },\n      y: { type: 'keyword', value: 'center' },\n    },\n    stops: [],\n  };\n\n  const properties = split(props).map(v => v.trim());\n\n  const prefix = split(properties[0], /\\s+/);\n\n  let k = '';\n  let j = 0;\n  for (let i = 0, n = prefix.length; i < n; i++) {\n    if (set.has(prefix[i])) {\n      if (i > 0) {\n        Object.assign(result, resolvePrefix(k, prefix, j, i));\n      }\n      k = prefix[i];\n      j = i + 1;\n    }\n  }\n\n  if (k) {\n    Object.assign(result, resolvePrefix(k, prefix, j, prefix.length));\n    properties.shift();\n  }\n\n  return { ...result, stops: resolveStops(properties) };\n}\n\nexport function stringifyConicGradient(input: ConicGradientResult) {\n  const { repeating, angle, position, color, stops } = input;\n\n  const type = repeating ? 'repeating-conic-gradient' : 'conic-gradient';\n\n  const prefixArr: string[] = [];\n\n  if (angle.trim()) {\n    prefixArr.push(`from ${angle}`);\n  }\n\n  const posX = position.x.value;\n  const posY = position.y.value;\n  const pos = posX.trim() || posY.trim() ? 'at ' + `${posX} ${posY}`.trim() : '';\n  if (pos) {\n    prefixArr.push(pos);\n  }\n\n  if (color && color.space) {\n    prefixArr.push(`in ${color.space} ${color.method || ''}`.trim());\n  }\n\n  const props: string[] = [];\n\n  if (prefixArr.length > 0) {\n    props.push(prefixArr.join(' '));\n  }\n\n  const stopsStr = stops\n    .map(s => `${s.color} ${s.offset?.value}${s.offset?.unit}`.trim())\n    .join(', ');\n\n  props.push(stopsStr);\n\n  return `${type}(${props.join(', ')})`;\n}\n"]}