@atlaskit/tokens/dist/esm/utils/generate-token-map.js

Design tokens are the single source of truth to name and store design decisions.

import _slicedToArray from "@babel/runtime/helpers/slicedToArray";
import rawTokensDark from '../artifacts/atlassian-dark-token-value-for-contrast-check';
import { generateColors } from './generate-colors';
import { getClosestColorIndex } from './get-closest-color-index';
import { getContrastRatio } from './get-contrast-ratio';
/**
 * Return the interaction tokens for a color, given its ramp position and the number of
 * needed interaction states. Use higher-indexed colors (i.e. darker colors) if possible;
 * if there's not enough room to shift up for the required number of interaction tokens,
 * it goes as far as it can, then returns lighter colors lower down the ramp instead.
 *
 * Returns an array of the resulting colors
 */
function getInteractionStates(rampPosition, number, colors) {
  var result = [];
  for (var i = 1; i <= number; i++) {
    if (rampPosition + i < colors.length) {
      result.push(rampPosition + i);
    } else {
      result.push(rampPosition - (i - (colors.length - 1 - rampPosition)));
    }
  }
  return result;
}
export var generateTokenMap = function generateTokenMap(brandColor, mode, themeRamp) {
  var _generateColors = generateColors(brandColor),
    ramp = _generateColors.ramp,
    replacedColor = _generateColors.replacedColor;
  var colors = themeRamp || ramp;
  var closestColorIndex = getClosestColorIndex(colors, brandColor);
  var customThemeTokenMapLight = {};
  var customThemeTokenMapDark = {};
  var inputContrast = getContrastRatio(brandColor, '#FFFFFF');
  // Branch based on brandColor's contrast against white
  if (inputContrast >= 4.5) {
    /**
     * Generate interaction tokens for
     * - color.background.brand.bold
     * - color.background.selected.bold
     */
    var _getInteractionStates = getInteractionStates(closestColorIndex, 2, colors),
      _getInteractionStates2 = _slicedToArray(_getInteractionStates, 2),
      brandBoldSelectedHoveredIndex = _getInteractionStates2[0],
      brandBoldSelectedPressedIndex = _getInteractionStates2[1];
    var brandTextIndex = closestColorIndex;
    if (inputContrast < 5.4 && inputContrast >= 4.8 && closestColorIndex === 6) {
      // Use the one-level darker closest color (X800) for color.text.brand
      // and color.link to avoid contrast breaches
      brandTextIndex = closestColorIndex + 1;
    }

    /**
     * Generate interaction token for color.link:
     * If inputted color replaces X1000
     * - Pressed = X900
     *
     * If inputted color replaces X700-X900
     * - Shift one 1 step darker
     */
    var _getInteractionStates3 = getInteractionStates(brandTextIndex, 1, colors),
      _getInteractionStates4 = _slicedToArray(_getInteractionStates3, 1),
      linkPressed = _getInteractionStates4[0];
    customThemeTokenMapLight = {
      'color.text.brand': brandTextIndex,
      'color.icon.brand': closestColorIndex,
      'color.background.brand.subtlest': 0,
      'color.background.brand.subtlest.hovered': 1,
      'color.background.brand.subtlest.pressed': 2,
      'color.background.brand.bold': closestColorIndex,
      'color.background.brand.bold.hovered': brandBoldSelectedHoveredIndex,
      'color.background.brand.bold.pressed': brandBoldSelectedPressedIndex,
      'color.background.brand.boldest': 9,
      'color.background.brand.boldest.hovered': 8,
      'color.background.brand.boldest.pressed': 7,
      'color.border.brand': closestColorIndex,
      'color.text.selected': brandTextIndex,
      'color.icon.selected': closestColorIndex,
      'color.background.selected.bold': closestColorIndex,
      'color.background.selected.bold.hovered': brandBoldSelectedHoveredIndex,
      'color.background.selected.bold.pressed': brandBoldSelectedPressedIndex,
      'color.border.selected': closestColorIndex,
      'color.link': brandTextIndex,
      'color.link.pressed': linkPressed,
      'color.chart.brand': 5,
      'color.chart.brand.hovered': 6,
      'color.background.selected': 0,
      'color.background.selected.hovered': 1,
      'color.background.selected.pressed': 2
    };
  } else {
    var brandBackgroundIndex = 6;
    if (inputContrast < 4.5 && inputContrast >= 4 && closestColorIndex === 6) {
      // Use the generated closest color instead of the input brand color for
      // color.background.selected.bold and color.background.brand.bold
      // to avoid contrast breaches
      brandBackgroundIndex = replacedColor;
    }
    customThemeTokenMapLight = {
      'color.background.brand.subtlest': 0,
      'color.background.brand.subtlest.hovered': 1,
      'color.background.brand.subtlest.pressed': 2,
      'color.background.brand.bold': brandBackgroundIndex,
      'color.background.brand.bold.hovered': 7,
      'color.background.brand.bold.pressed': 8,
      'color.background.brand.boldest': 9,
      'color.background.brand.boldest.hovered': 8,
      'color.background.brand.boldest.pressed': 7,
      'color.border.brand': 6,
      'color.background.selected.bold': brandBackgroundIndex,
      'color.background.selected.bold.hovered': 7,
      'color.background.selected.bold.pressed': 8,
      'color.text.brand': 6,
      'color.icon.brand': 6,
      'color.chart.brand': 5,
      'color.chart.brand.hovered': 6,
      'color.text.selected': 6,
      'color.icon.selected': 6,
      'color.border.selected': 6,
      'color.background.selected': 0,
      'color.background.selected.hovered': 1,
      'color.background.selected.pressed': 2,
      'color.link': 6,
      'color.link.pressed': 7
    };
  }
  if (mode === 'light') {
    return {
      light: customThemeTokenMapLight
    };
  }

  /**
   * Generate dark mode values using rule of symmetry
   */
  Object.entries(customThemeTokenMapLight).forEach(function (_ref) {
    var _ref2 = _slicedToArray(_ref, 2),
      key = _ref2[0],
      value = _ref2[1];
    customThemeTokenMapDark[key] = 9 - (typeof value === 'string' ? closestColorIndex : value);
  });

  /**
   * If the input brand color < 4.5, and it meets 4.5 contrast again inverse text color
   * in dark mode, shift color.background.brand.bold to the brand color
   */
  if (inputContrast < 4.5) {
    var inverseTextColor = rawTokensDark['color.text.inverse'];
    if (getContrastRatio(inverseTextColor, brandColor) >= 4.5 && closestColorIndex >= 2) {
      customThemeTokenMapDark['color.background.brand.bold'] = closestColorIndex;
      customThemeTokenMapDark['color.background.brand.bold.hovered'] = closestColorIndex - 1;
      customThemeTokenMapDark['color.background.brand.bold.pressed'] = closestColorIndex - 2;
    }
  }
  if (mode === 'dark') {
    return {
      dark: customThemeTokenMapDark
    };
  }
  return {
    light: customThemeTokenMapLight,
    dark: customThemeTokenMapDark
  };
};