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import { getObjectKeys } from '../../domUtils/getObjectKeys';
import type {
DarkColorHandler,
Colors,
ColorTransformFunction,
BorderKey,
} from 'roosterjs-content-model-types';
/**
* List of deprecated colors
*/
export const DeprecatedColors: string[] = [
'inactiveborder',
'activeborder',
'inactivecaptiontext',
'inactivecaption',
'activecaption',
'appworkspace',
'infobackground',
'background',
'buttonhighlight',
'buttonshadow',
'captiontext',
'infotext',
'menutext',
'menu',
'scrollbar',
'threeddarkshadow',
'threedface',
'threedhighlight',
'threedlightshadow',
'threedfhadow',
'windowtext',
'windowframe',
'window',
];
const BlackColor = 'rgb(0, 0, 0)';
const HEX3_REGEX = /^#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])$/;
const HEX6_REGEX = /^#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})$/;
const RGB_REGEX = /^rgb\(\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\s*\)$/;
const RGBA_REGEX = /^rgba\(\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\s*\)$/;
const VARIABLE_REGEX = /^\s*var\(\s*(\-\-[a-zA-Z0-9\-_]+)\s*(?:,\s*(.*))?\)\s*$/;
const VARIABLE_PREFIX = 'var(';
const VARIABLE_POSTFIX = ')';
const COLOR_VAR_PREFIX = '--darkColor';
/**
* Get color from given HTML element
* @param element The element to get color from
* @param isBackground True to get background color, false to get text color
* @param isDarkMode Whether element is in dark mode now
* @param darkColorHandler @optional The dark color handler object to help manager dark mode color
* @param fallback @optional Fallback color to use if no color is found from the element
*/
export function getColor(
element: HTMLElement,
isBackground: boolean,
isDarkMode: boolean,
darkColorHandler?: DarkColorHandler,
fallback?: string
): string | undefined {
const color = retrieveElementColor(element, isBackground ? 'background' : 'text', fallback);
return color
? getLightModeColor(
color,
isDarkMode,
darkColorHandler,
isBackground ? undefined : BlackColor
)
: undefined;
}
/**
* @internal
*/
export function getLightModeColor(
color: string,
isDarkMode: boolean,
darkColorHandler?: DarkColorHandler,
fallback?: string
) {
if (DeprecatedColors.indexOf(color) > -1) {
return fallback;
} else if (darkColorHandler) {
const match = color.startsWith(VARIABLE_PREFIX) ? VARIABLE_REGEX.exec(color) : null;
if (match) {
color = match[2] || '';
} else if (isDarkMode) {
// If editor is in dark mode but the color is not in dark color format, it is possible the color was inserted from external code
// without any light color info. So we first try to see if there is a known dark color can match this color, and use its related
// light color as light mode color. Otherwise we need to drop this color to avoid show "white on white" content.
return findLightColorFromDarkColor(color, darkColorHandler.knownColors) || '';
}
}
return color;
}
/**
* @internal
*/
export function retrieveElementColor(
element: HTMLElement,
source: 'text' | 'background' | BorderKey,
fallback?: string
): string | undefined {
switch (source) {
case 'text':
return element.style.color || element.getAttribute('color') || fallback;
case 'background':
return element.style.backgroundColor || element.getAttribute('bgcolor') || fallback;
default:
return element.style.getPropertyValue(BorderColorKeyMap[source]) || fallback;
}
}
/**
* Set color to given HTML element
* @param element The element to set color to
* @param color The color to set, always pass in color in light mode
* @param isBackground True to set background color, false to set text color
* @param isDarkMode Whether element is in dark mode now
* @param darkColorHandler @optional The dark color handler object to help manager dark mode color
*/
export function setColor(
element: HTMLElement,
color: string | null | undefined,
isBackground: boolean,
isDarkMode: boolean,
darkColorHandler?: DarkColorHandler
) {
const newColor = adaptColor(
element,
color,
isBackground ? 'background' : 'text',
isDarkMode,
darkColorHandler
);
element.removeAttribute(isBackground ? 'bgcolor' : 'color');
element.style.setProperty(isBackground ? 'background-color' : 'color', newColor || null);
}
/**
* @internal
*/
export function adaptColor(
element: HTMLElement,
color: string | null | undefined,
colorType: 'text' | 'background' | 'border',
isDarkMode: boolean,
darkColorHandler?: DarkColorHandler
) {
const match = color && color.startsWith(VARIABLE_PREFIX) ? VARIABLE_REGEX.exec(color) : null;
const [_, existingKey, fallbackColor] = match ?? [];
color = fallbackColor ?? color;
if (darkColorHandler && color) {
const key =
existingKey ||
darkColorHandler.generateColorKey(color, undefined /*baseLValue*/, colorType, element);
const darkModeColor =
darkColorHandler.knownColors?.[key]?.darkModeColor ||
darkColorHandler.getDarkColor(color, undefined /*baseLValue*/, colorType, element);
darkColorHandler.updateKnownColor(isDarkMode, key, {
lightModeColor: color,
darkModeColor,
});
color = isDarkMode ? `${VARIABLE_PREFIX}${key}, ${color}${VARIABLE_POSTFIX}` : color;
}
return color;
}
/**
* Generate color key for dark color
* @param lightColor The input light color
* @returns Key of the color
*/
export const defaultGenerateColorKey: ColorTransformFunction = lightColor => {
return `${COLOR_VAR_PREFIX}_${lightColor.replace(/[^\d\w]/g, '_')}`;
};
/**
* Parse color string to r/g/b value.
* If the given color is not in a recognized format, return null
* @param color The source color to parse
* @returns An array of Red/Green/Blue value, or null if fail to parse
*/
export function parseColor(color: string): [number, number, number] | null {
color = (color || '').trim();
let match: RegExpMatchArray | null;
if ((match = color.match(HEX3_REGEX))) {
return [
parseInt(match[1] + match[1], 16),
parseInt(match[2] + match[2], 16),
parseInt(match[3] + match[3], 16),
];
} else if ((match = color.match(HEX6_REGEX))) {
return [parseInt(match[1], 16), parseInt(match[2], 16), parseInt(match[3], 16)];
} else if ((match = color.match(RGB_REGEX) || color.match(RGBA_REGEX))) {
return [parseInt(match[1]), parseInt(match[2]), parseInt(match[3])];
} else {
// CSS color names such as red, green is not included for now.
// If need, we can add those colors from https://www.w3.org/wiki/CSS/Properties/color/keywords
return null;
}
}
function findLightColorFromDarkColor(
darkColor: string,
knownColors?: Record<string, Colors>
): string | null {
const rgbSearch = parseColor(darkColor);
if (rgbSearch && knownColors) {
const key = getObjectKeys(knownColors).find(key => {
const rgbCurrent = parseColor(knownColors[key].darkModeColor);
return (
rgbCurrent &&
rgbCurrent[0] == rgbSearch[0] &&
rgbCurrent[1] == rgbSearch[1] &&
rgbCurrent[2] == rgbSearch[2]
);
});
if (key) {
return knownColors[key].lightModeColor;
}
}
return null;
}
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