prepareCssVars.js
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import deepmerge from '@mui/utils/deepmerge';
import cssVarsParser from "./cssVarsParser.js";
function prepareCssVars(theme, parserConfig = {}) {
const {
getSelector = defaultGetSelector,
disableCssColorScheme,
colorSchemeSelector: selector,
enableContrastVars
} = parserConfig;
// @ts-ignore - ignore components do not exist
const {
colorSchemes = {},
components,
defaultColorScheme = 'light',
...otherTheme
} = theme;
const {
vars: rootVars,
css: rootCss,
varsWithDefaults: rootVarsWithDefaults
} = cssVarsParser(otherTheme, parserConfig);
let themeVars = rootVarsWithDefaults;
const colorSchemesMap = {};
const {
[defaultColorScheme]: defaultScheme,
...otherColorSchemes
} = colorSchemes;
Object.entries(otherColorSchemes || {}).forEach(([key, scheme]) => {
const {
vars,
css,
varsWithDefaults
} = cssVarsParser(scheme, parserConfig);
themeVars = deepmerge(themeVars, varsWithDefaults);
colorSchemesMap[key] = {
css,
vars
};
});
if (defaultScheme) {
// default color scheme vars should be merged last to set as default
const {
css,
vars,
varsWithDefaults
} = cssVarsParser(defaultScheme, parserConfig);
themeVars = deepmerge(themeVars, varsWithDefaults);
colorSchemesMap[defaultColorScheme] = {
css,
vars
};
}
function defaultGetSelector(colorScheme, cssObject) {
let rule = selector;
if (selector === 'class') {
rule = '.%s';
}
if (selector === 'data') {
rule = '[data-%s]';
}
if (selector?.startsWith('data-') && !selector.includes('%s')) {
// 'data-joy-color-scheme' -> '[data-joy-color-scheme="%s"]'
rule = `[${selector}="%s"]`;
}
if (colorScheme) {
if (rule === 'media') {
if (theme.defaultColorScheme === colorScheme) {
return ':root';
}
const mode = colorSchemes[colorScheme]?.palette?.mode || colorScheme;
return {
[`@media (prefers-color-scheme: ${mode})`]: {
':root': cssObject
}
};
}
if (rule) {
if (theme.defaultColorScheme === colorScheme) {
return `:root, ${rule.replace('%s', String(colorScheme))}`;
}
return rule.replace('%s', String(colorScheme));
}
}
return ':root';
}
const generateThemeVars = () => {
let vars = {
...rootVars
};
Object.entries(colorSchemesMap).forEach(([, {
vars: schemeVars
}]) => {
vars = deepmerge(vars, schemeVars);
});
return vars;
};
const generateStyleSheets = () => {
const stylesheets = [];
const colorScheme = theme.defaultColorScheme || 'light';
function insertStyleSheet(key, css) {
if (Object.keys(css).length) {
stylesheets.push(typeof key === 'string' ? {
[key]: {
...css
}
} : key);
}
}
insertStyleSheet(getSelector(undefined, {
...rootCss
}), rootCss);
const {
[colorScheme]: defaultSchemeVal,
...other
} = colorSchemesMap;
if (defaultSchemeVal) {
// default color scheme has to come before other color schemes
const {
css
} = defaultSchemeVal;
const cssColorSheme = colorSchemes[colorScheme]?.palette?.mode;
const finalCss = !disableCssColorScheme && cssColorSheme ? {
colorScheme: cssColorSheme,
...css
} : {
...css
};
insertStyleSheet(getSelector(colorScheme, {
...finalCss
}), finalCss);
}
Object.entries(other).forEach(([key, {
css
}]) => {
const cssColorSheme = colorSchemes[key]?.palette?.mode;
const finalCss = !disableCssColorScheme && cssColorSheme ? {
colorScheme: cssColorSheme,
...css
} : {
...css
};
insertStyleSheet(getSelector(key, {
...finalCss
}), finalCss);
});
if (enableContrastVars) {
stylesheets.push({
':root': {
// use double underscore to indicate that these are private variables
'--__l-threshold': '0.7',
'--__l': 'clamp(0, (l / var(--__l-threshold) - 1) * -infinity, 1)',
'--__a': 'clamp(0.87, (l / var(--__l-threshold) - 1) * -infinity, 1)' // 0.87 is the default alpha value for black text.
}
});
}
return stylesheets;
};
return {
vars: themeVars,
generateThemeVars,
generateStyleSheets
};
}
export default prepareCssVars;