postcss-rtl/lib/keyframes.js

PostCSS plugin for RTL-optimizations

"use strict";

function unprefixed(prop) {
  return prop.replace(/^-\w+-/, '');
}
const {
  rtlifyDecl
} = require('./decls');
const {
  rtlifyRule
} = require('./rules');
const isKeyframeRule = rule => rule.type === 'atrule' && unprefixed(rule.name) === 'keyframes';
const isKeyframeAlreadyProcessed = rule => !!rule.params.match(/-ltr$|-rtl$/);
const isKeyframeSymmetric = rule => !rtlifyRule(rule);
const rtlifyKeyframe = (rule, options) => {
  const ruleName = rule.params;
  rule.params = `${ruleName}-ltr`;
  if (!options.onlyDirection || options.onlyDirection === 'rtl') {
    const rtlRule = rule.cloneAfter({
      params: `${ruleName}-rtl`
    });
    rtlRule.walkDecls(decl => {
      const rtl = rtlifyDecl(decl);
      decl.value = rtl ? rtl.value : decl.value;
    });
  }
  if (options.onlyDirection && options.onlyDirection === 'rtl') {
    rule.remove();
  }
};
module.exports = {
  isKeyframeRule,
  isKeyframeAlreadyProcessed,
  isKeyframeSymmetric,
  rtlifyKeyframe
};