ant-design/components/config-provider/cssVariables.ts

import { generate } from '@ant-design/colors';
import { FastColor } from '@ant-design/fast-color';
import canUseDom from '@rc-component/util/lib/Dom/canUseDom';
import { updateCSS } from '@rc-component/util/lib/Dom/dynamicCSS';

import warning from '../_util/warning';
import type { Theme } from './context';

const dynamicStyleMark = `-ant-${Date.now()}-${Math.random()}`;

export function getStyle(globalPrefixCls: string, theme: Theme) {
  const variables: Record<string, string> = {};

  const formatColor = (color: FastColor, updater?: (cloneColor: FastColor) => FastColor) => {
    let clone = color.clone();
    clone = updater?.(clone) || clone;
    return clone.toRgbString();
  };

  const fillColor = (colorVal: string, type: string) => {
    const baseColor = new FastColor(colorVal);
    const colorPalettes = generate(baseColor.toRgbString());

    variables[`${type}-color`] = formatColor(baseColor);
    variables[`${type}-color-disabled`] = colorPalettes[1];
    variables[`${type}-color-hover`] = colorPalettes[4];
    variables[`${type}-color-active`] = colorPalettes[6];
    variables[`${type}-color-outline`] = baseColor.clone().setA(0.2).toRgbString();
    variables[`${type}-color-deprecated-bg`] = colorPalettes[0];
    variables[`${type}-color-deprecated-border`] = colorPalettes[2];
  };

  // ================ Primary Color ================
  if (theme.primaryColor) {
    fillColor(theme.primaryColor, 'primary');

    const primaryColor = new FastColor(theme.primaryColor);
    const primaryColors = generate(primaryColor.toRgbString());

    // Legacy - We should use semantic naming standard
    primaryColors.forEach((color, index) => {
      variables[`primary-${index + 1}`] = color;
    });
    // Deprecated
    variables['primary-color-deprecated-l-35'] = formatColor(primaryColor, (c) => c.lighten(35));
    variables['primary-color-deprecated-l-20'] = formatColor(primaryColor, (c) => c.lighten(20));
    variables['primary-color-deprecated-t-20'] = formatColor(primaryColor, (c) => c.tint(20));
    variables['primary-color-deprecated-t-50'] = formatColor(primaryColor, (c) => c.tint(50));
    variables['primary-color-deprecated-f-12'] = formatColor(primaryColor, (c) =>
      c.setA(c.a * 0.12),
    );

    const primaryActiveColor = new FastColor(primaryColors[0]);
    variables['primary-color-active-deprecated-f-30'] = formatColor(primaryActiveColor, (c) =>
      c.setA(c.a * 0.3),
    );
    variables['primary-color-active-deprecated-d-02'] = formatColor(primaryActiveColor, (c) =>
      c.darken(2),
    );
  }

  // ================ Success Color ================
  if (theme.successColor) {
    fillColor(theme.successColor, 'success');
  }

  // ================ Warning Color ================
  if (theme.warningColor) {
    fillColor(theme.warningColor, 'warning');
  }

  // ================= Error Color =================
  if (theme.errorColor) {
    fillColor(theme.errorColor, 'error');
  }

  // ================= Info Color ==================
  if (theme.infoColor) {
    fillColor(theme.infoColor, 'info');
  }

  // Convert to css variables
  const cssList = Object.keys(variables).map(
    (key) => `--${globalPrefixCls}-${key}: ${variables[key]};`,
  );

  return `
  :root {
    ${cssList.join('\n')}
  }
  `.trim();
}

export function registerTheme(globalPrefixCls: string, theme: Theme) {
  const style = getStyle(globalPrefixCls, theme);

  if (canUseDom()) {
    updateCSS(style, `${dynamicStyleMark}-dynamic-theme`);
  } else {
    warning(false, 'ConfigProvider', 'SSR do not support dynamic theme with css variables.');
  }
}