goog.debug.DevCss.prototype.replaceBrowserSpecificClassNames_ = function()

in asdoc/library/closure/goog/debug/devcss/devcss.js [265:349]

• 60 lines of code
• 20 McCabe index (conditional complexity)

goog.debug.DevCss.prototype.replaceBrowserSpecificClassNames_ = function(
    cssRule) {

  // If we don't match the browser token, we can stop now.
  if (!cssRule.selectorText ||
      !cssRule.selectorText.match(this.userAgentTokens_.ANY)) {
    return;
  }

  // We know it will begin as a classname.
  var additionalRegexString;

  // Tests "Less than or equals".
  var compared = this.getRuleVersionAndCompare_(
      cssRule, this.userAgentTokens_.LESS_THAN_OR_EQUAL);
  if (compared && compared.length) {
    if (compared[0] > 0) {
      return;
    }
    additionalRegexString =
        this.userAgentTokens_.LESS_THAN_OR_EQUAL + compared[1];
  }

  // Tests "Less than".
  compared =
      this.getRuleVersionAndCompare_(cssRule, this.userAgentTokens_.LESS_THAN);
  if (compared && compared.length) {
    if (compared[0] > -1) {
      return;
    }
    additionalRegexString = this.userAgentTokens_.LESS_THAN + compared[1];
  }

  // Tests "Greater than or equals".
  compared = this.getRuleVersionAndCompare_(
      cssRule, this.userAgentTokens_.GREATER_THAN_OR_EQUAL);
  if (compared && compared.length) {
    if (compared[0] < 0) {
      return;
    }
    additionalRegexString =
        this.userAgentTokens_.GREATER_THAN_OR_EQUAL + compared[1];
  }

  // Tests "Greater than".
  compared = this.getRuleVersionAndCompare_(
      cssRule, this.userAgentTokens_.GREATER_THAN);
  if (compared && compared.length) {
    if (compared[0] < 1) {
      return;
    }
    additionalRegexString = this.userAgentTokens_.GREATER_THAN + compared[1];
  }

  // Tests "Equals".
  compared =
      this.getRuleVersionAndCompare_(cssRule, this.userAgentTokens_.EQUALS);
  if (compared && compared.length) {
    if (compared[0] != 0) {
      return;
    }
    additionalRegexString = this.userAgentTokens_.EQUALS + compared[1];
  }

  // If we got to here without generating the additionalRegexString, then
  // we did not match any of our comparison token strings, and we want a
  // general browser token replacement.
  if (!additionalRegexString) {
    additionalRegexString = this.userAgentTokens_.ANY;
  }

  // We need to match at least a single whitespace character to know that
  // we are matching the entire useragent string token.
  var regexString = '\\.' + additionalRegexString + '\\s+';
  var re = new RegExp(regexString, 'g');

  var currentCssText = goog.cssom.getCssTextFromCssRule(cssRule);

  // Replacing the token with '' activates the selector for this useragent.
  var newCssText = currentCssText.replace(re, '');

  if (newCssText != currentCssText) {
    goog.cssom.replaceCssRule(cssRule, newCssText);
  }
};