next-csrf/example/node_modules/styled-jsx/dist/lib/stylesheet.js

CSRF mitigation library for Next.js

"use strict";

exports.__esModule = true;
exports["default"] = void 0;

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

/*
Based on Glamor's sheet
https://github.com/threepointone/glamor/blob/667b480d31b3721a905021b26e1290ce92ca2879/src/sheet.js
*/
var isProd = typeof process !== 'undefined' && process.env && process.env.NODE_ENV === 'production';

var isString = function isString(o) {
  return Object.prototype.toString.call(o) === '[object String]';
};

var StyleSheet =
/*#__PURE__*/
function () {
  function StyleSheet(_temp) {
    var _ref = _temp === void 0 ? {} : _temp,
        _ref$name = _ref.name,
        name = _ref$name === void 0 ? 'stylesheet' : _ref$name,
        _ref$optimizeForSpeed = _ref.optimizeForSpeed,
        optimizeForSpeed = _ref$optimizeForSpeed === void 0 ? isProd : _ref$optimizeForSpeed,
        _ref$isBrowser = _ref.isBrowser,
        isBrowser = _ref$isBrowser === void 0 ? typeof window !== 'undefined' : _ref$isBrowser;

    invariant(isString(name), '`name` must be a string');
    this._name = name;
    this._deletedRulePlaceholder = "#" + name + "-deleted-rule____{}";
    invariant(typeof optimizeForSpeed === 'boolean', '`optimizeForSpeed` must be a boolean');
    this._optimizeForSpeed = optimizeForSpeed;
    this._isBrowser = isBrowser;
    this._serverSheet = undefined;
    this._tags = [];
    this._injected = false;
    this._rulesCount = 0;
    var node = this._isBrowser && document.querySelector('meta[property="csp-nonce"]');
    this._nonce = node ? node.getAttribute('content') : null;
  }

  var _proto = StyleSheet.prototype;

  _proto.setOptimizeForSpeed = function setOptimizeForSpeed(bool) {
    invariant(typeof bool === 'boolean', '`setOptimizeForSpeed` accepts a boolean');
    invariant(this._rulesCount === 0, 'optimizeForSpeed cannot be when rules have already been inserted');
    this.flush();
    this._optimizeForSpeed = bool;
    this.inject();
  };

  _proto.isOptimizeForSpeed = function isOptimizeForSpeed() {
    return this._optimizeForSpeed;
  };

  _proto.inject = function inject() {
    var _this = this;

    invariant(!this._injected, 'sheet already injected');
    this._injected = true;

    if (this._isBrowser && this._optimizeForSpeed) {
      this._tags[0] = this.makeStyleTag(this._name);
      this._optimizeForSpeed = 'insertRule' in this.getSheet();

      if (!this._optimizeForSpeed) {
        if (!isProd) {
          console.warn('StyleSheet: optimizeForSpeed mode not supported falling back to standard mode.');
        }

        this.flush();
        this._injected = true;
      }

      return;
    }

    this._serverSheet = {
      cssRules: [],
      insertRule: function insertRule(rule, index) {
        if (typeof index === 'number') {
          _this._serverSheet.cssRules[index] = {
            cssText: rule
          };
        } else {
          _this._serverSheet.cssRules.push({
            cssText: rule
          });
        }

        return index;
      },
      deleteRule: function deleteRule(index) {
        _this._serverSheet.cssRules[index] = null;
      }
    };
  };

  _proto.getSheetForTag = function getSheetForTag(tag) {
    if (tag.sheet) {
      return tag.sheet;
    } // this weirdness brought to you by firefox


    for (var i = 0; i < document.styleSheets.length; i++) {
      if (document.styleSheets[i].ownerNode === tag) {
        return document.styleSheets[i];
      }
    }
  };

  _proto.getSheet = function getSheet() {
    return this.getSheetForTag(this._tags[this._tags.length - 1]);
  };

  _proto.insertRule = function insertRule(rule, index) {
    invariant(isString(rule), '`insertRule` accepts only strings');

    if (!this._isBrowser) {
      if (typeof index !== 'number') {
        index = this._serverSheet.cssRules.length;
      }

      this._serverSheet.insertRule(rule, index);

      return this._rulesCount++;
    }

    if (this._optimizeForSpeed) {
      var sheet = this.getSheet();

      if (typeof index !== 'number') {
        index = sheet.cssRules.length;
      } // this weirdness for perf, and chrome's weird bug
      // https://stackoverflow.com/questions/20007992/chrome-suddenly-stopped-accepting-insertrule


      try {
        sheet.insertRule(rule, index);
      } catch (error) {
        if (!isProd) {
          console.warn("StyleSheet: illegal rule: \n\n" + rule + "\n\nSee https://stackoverflow.com/q/20007992 for more info");
        }

        return -1;
      }
    } else {
      var insertionPoint = this._tags[index];

      this._tags.push(this.makeStyleTag(this._name, rule, insertionPoint));
    }

    return this._rulesCount++;
  };

  _proto.replaceRule = function replaceRule(index, rule) {
    if (this._optimizeForSpeed || !this._isBrowser) {
      var sheet = this._isBrowser ? this.getSheet() : this._serverSheet;

      if (!rule.trim()) {
        rule = this._deletedRulePlaceholder;
      }

      if (!sheet.cssRules[index]) {
        // @TBD Should we throw an error?
        return index;
      }

      sheet.deleteRule(index);

      try {
        sheet.insertRule(rule, index);
      } catch (error) {
        if (!isProd) {
          console.warn("StyleSheet: illegal rule: \n\n" + rule + "\n\nSee https://stackoverflow.com/q/20007992 for more info");
        } // In order to preserve the indices we insert a deleteRulePlaceholder


        sheet.insertRule(this._deletedRulePlaceholder, index);
      }
    } else {
      var tag = this._tags[index];
      invariant(tag, "old rule at index `" + index + "` not found");
      tag.textContent = rule;
    }

    return index;
  };

  _proto.deleteRule = function deleteRule(index) {
    if (!this._isBrowser) {
      this._serverSheet.deleteRule(index);

      return;
    }

    if (this._optimizeForSpeed) {
      this.replaceRule(index, '');
    } else {
      var tag = this._tags[index];
      invariant(tag, "rule at index `" + index + "` not found");
      tag.parentNode.removeChild(tag);
      this._tags[index] = null;
    }
  };

  _proto.flush = function flush() {
    this._injected = false;
    this._rulesCount = 0;

    if (this._isBrowser) {
      this._tags.forEach(function (tag) {
        return tag && tag.parentNode.removeChild(tag);
      });

      this._tags = [];
    } else {
      // simpler on server
      this._serverSheet.cssRules = [];
    }
  };

  _proto.cssRules = function cssRules() {
    var _this2 = this;

    if (!this._isBrowser) {
      return this._serverSheet.cssRules;
    }

    return this._tags.reduce(function (rules, tag) {
      if (tag) {
        rules = rules.concat(Array.prototype.map.call(_this2.getSheetForTag(tag).cssRules, function (rule) {
          return rule.cssText === _this2._deletedRulePlaceholder ? null : rule;
        }));
      } else {
        rules.push(null);
      }

      return rules;
    }, []);
  };

  _proto.makeStyleTag = function makeStyleTag(name, cssString, relativeToTag) {
    if (cssString) {
      invariant(isString(cssString), 'makeStyleTag acceps only strings as second parameter');
    }

    var tag = document.createElement('style');
    if (this._nonce) tag.setAttribute('nonce', this._nonce);
    tag.type = 'text/css';
    tag.setAttribute("data-" + name, '');

    if (cssString) {
      tag.appendChild(document.createTextNode(cssString));
    }

    var head = document.head || document.getElementsByTagName('head')[0];

    if (relativeToTag) {
      head.insertBefore(tag, relativeToTag);
    } else {
      head.appendChild(tag);
    }

    return tag;
  };

  _createClass(StyleSheet, [{
    key: "length",
    get: function get() {
      return this._rulesCount;
    }
  }]);

  return StyleSheet;
}();

exports["default"] = StyleSheet;

function invariant(condition, message) {
  if (!condition) {
    throw new Error("StyleSheet: " + message + ".");
  }
}