@mui/system/modern/style/style.js

MUI System is a set of CSS utilities to help you build custom designs more efficiently. It makes it possible to rapidly lay out custom designs.

import capitalize from '@mui/utils/capitalize';
import responsivePropType from "../responsivePropType/index.js";
import { handleBreakpoints } from "../breakpoints/index.js";
export function getPath(obj, path, checkVars = true) {
  if (!path || typeof path !== 'string') {
    return null;
  }

  // Check if CSS variables are used
  if (obj && obj.vars && checkVars) {
    const val = `vars.${path}`.split('.').reduce((acc, item) => acc && acc[item] ? acc[item] : null, obj);
    if (val != null) {
      return val;
    }
  }
  return path.split('.').reduce((acc, item) => {
    if (acc && acc[item] != null) {
      return acc[item];
    }
    return null;
  }, obj);
}
export function getStyleValue(themeMapping, transform, propValueFinal, userValue = propValueFinal) {
  let value;
  if (typeof themeMapping === 'function') {
    value = themeMapping(propValueFinal);
  } else if (Array.isArray(themeMapping)) {
    value = themeMapping[propValueFinal] || userValue;
  } else {
    value = getPath(themeMapping, propValueFinal) || userValue;
  }
  if (transform) {
    value = transform(value, userValue, themeMapping);
  }
  return value;
}
function style(options) {
  const {
    prop,
    cssProperty = options.prop,
    themeKey,
    transform
  } = options;

  // false positive
  // eslint-disable-next-line react/function-component-definition
  const fn = props => {
    if (props[prop] == null) {
      return null;
    }
    const propValue = props[prop];
    const theme = props.theme;
    const themeMapping = getPath(theme, themeKey) || {};
    const styleFromPropValue = propValueFinal => {
      let value = getStyleValue(themeMapping, transform, propValueFinal);
      if (propValueFinal === value && typeof propValueFinal === 'string') {
        // Haven't found value
        value = getStyleValue(themeMapping, transform, `${prop}${propValueFinal === 'default' ? '' : capitalize(propValueFinal)}`, propValueFinal);
      }
      if (cssProperty === false) {
        return value;
      }
      return {
        [cssProperty]: value
      };
    };
    return handleBreakpoints(props, propValue, styleFromPropValue);
  };
  fn.propTypes = process.env.NODE_ENV !== 'production' ? {
    [prop]: responsivePropType
  } : {};
  fn.filterProps = [prop];
  return fn;
}
export default style;