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Viewing file:     createGenerateClassName.js (2.35 KB)      -rw-r--r--

import nested from '../ThemeProvider/nested';
/**
 * This is the list of the style rule name we use as drop in replacement for the built-in
 * pseudo classes (:checked, :disabled, :focused, etc.).
 *
 * Why do they exist in the first place?
 * These classes are used at a specificity of 2.
 * It allows them to override previously definied styles as well as
 * being untouched by simple user overrides.
 */

const pseudoClasses = ['checked', 'disabled', 'error', 'focused', 'focusVisible', 'required', 'expanded', 'selected']; // Returns a function which generates unique class names based on counters.
// When new generator function is created, rule counter is reset.
// We need to reset the rule counter for SSR for each request.
//
// It's inspired by
// https://github.com/cssinjs/jss/blob/4e6a05dd3f7b6572fdd3ab216861d9e446c20331/src/utils/createGenerateClassName.js

export default function createGenerateClassName(options = {}) {
  const {
    disableGlobal = false,
    productionPrefix = 'jss',
    seed = ''
  } = options;
  const seedPrefix = seed === '' ? '' : `${seed}-`;
  let ruleCounter = 0;

  const getNextCounterId = () => {
    ruleCounter += 1;

    if (process.env.NODE_ENV !== 'production') {
      if (ruleCounter >= 1e10) {
        console.warn(['Material-UI: You might have a memory leak.', 'The ruleCounter is not supposed to grow that much.'].join(''));
      }
    }

    return ruleCounter;
  };

  return (rule, styleSheet) => {
    const name = styleSheet.options.name; // Is a global static MUI style?

    if (name && name.indexOf('Mui') === 0 && !styleSheet.options.link && !disableGlobal) {
      // We can use a shorthand class name, we never use the keys to style the components.
      if (pseudoClasses.indexOf(rule.key) !== -1) {
        return `Mui-${rule.key}`;
      }

      const prefix = `${seedPrefix}${name}-${rule.key}`;

      if (!styleSheet.options.theme[nested] || seed !== '') {
        return prefix;
      }

      return `${prefix}-${getNextCounterId()}`;
    }

    if (process.env.NODE_ENV === 'production') {
      return `${seedPrefix}${productionPrefix}${getNextCounterId()}`;
    }

    const suffix = `${rule.key}-${getNextCounterId()}`; // Help with debuggability.

    if (styleSheet.options.classNamePrefix) {
      return `${seedPrefix}${styleSheet.options.classNamePrefix}-${suffix}`;
    }

    return `${seedPrefix}${suffix}`;
  };
}