pdfjs-dist/lib/display/xml_parser.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2018 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _get = function get(object, property, receiver) { if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { return get(parent, property, receiver); } } else if ("value" in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } };

var _createClass = function () { 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); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var XMLParserErrorCode = {
  NoError: 0,
  EndOfDocument: -1,
  UnterminatedCdat: -2,
  UnterminatedXmlDeclaration: -3,
  UnterminatedDoctypeDeclaration: -4,
  UnterminatedComment: -5,
  MalformedElement: -6,
  OutOfMemory: -7,
  UnterminatedAttributeValue: -8,
  UnterminatedElement: -9,
  ElementNeverBegun: -10
};
function isWhitespace(s, index) {
  var ch = s[index];
  return ch === ' ' || ch === '\n' || ch === '\r' || ch === '\t';
}
function isWhitespaceString(s) {
  for (var i = 0, ii = s.length; i < ii; i++) {
    if (!isWhitespace(s, i)) {
      return false;
    }
  }
  return true;
}

var XMLParserBase = function () {
  function XMLParserBase() {
    _classCallCheck(this, XMLParserBase);
  }

  _createClass(XMLParserBase, [{
    key: '_resolveEntities',
    value: function _resolveEntities(s) {
      return s.replace(/&([^;]+);/g, function (all, entity) {
        if (entity.substring(0, 2) === '#x') {
          return String.fromCharCode(parseInt(entity.substring(2), 16));
        } else if (entity.substring(0, 1) === '#') {
          return String.fromCharCode(parseInt(entity.substring(1), 10));
        }
        switch (entity) {
          case 'lt':
            return '<';
          case 'gt':
            return '>';
          case 'amp':
            return '&';
          case 'quot':
            return '\"';
        }
        return this.onResolveEntity(entity);
      });
    }
  }, {
    key: '_parseContent',
    value: function _parseContent(s, start) {
      var pos = start,
          name = void 0,
          attributes = [];
      function skipWs() {
        while (pos < s.length && isWhitespace(s, pos)) {
          ++pos;
        }
      }
      while (pos < s.length && !isWhitespace(s, pos) && s[pos] !== '>' && s[pos] !== '/') {
        ++pos;
      }
      name = s.substring(start, pos);
      skipWs();
      while (pos < s.length && s[pos] !== '>' && s[pos] !== '/' && s[pos] !== '?') {
        skipWs();
        var attrName = '',
            attrValue = '';
        while (pos < s.length && !isWhitespace(s, pos) && s[pos] !== '=') {
          attrName += s[pos];
          ++pos;
        }
        skipWs();
        if (s[pos] !== '=') {
          return null;
        }
        ++pos;
        skipWs();
        var attrEndChar = s[pos];
        if (attrEndChar !== '\"' && attrEndChar !== '\'') {
          return null;
        }
        var attrEndIndex = s.indexOf(attrEndChar, ++pos);
        if (attrEndIndex < 0) {
          return null;
        }
        attrValue = s.substring(pos, attrEndIndex);
        attributes.push({
          name: attrName,
          value: this._resolveEntities(attrValue)
        });
        pos = attrEndIndex + 1;
        skipWs();
      }
      return {
        name: name,
        attributes: attributes,
        parsed: pos - start
      };
    }
  }, {
    key: '_parseProcessingInstruction',
    value: function _parseProcessingInstruction(s, start) {
      var pos = start,
          name = void 0,
          value = void 0;
      function skipWs() {
        while (pos < s.length && isWhitespace(s, pos)) {
          ++pos;
        }
      }
      while (pos < s.length && !isWhitespace(s, pos) && s[pos] !== '>' && s[pos] !== '/') {
        ++pos;
      }
      name = s.substring(start, pos);
      skipWs();
      var attrStart = pos;
      while (pos < s.length && (s[pos] !== '?' || s[pos + 1] !== '>')) {
        ++pos;
      }
      value = s.substring(attrStart, pos);
      return {
        name: name,
        value: value,
        parsed: pos - start
      };
    }
  }, {
    key: 'parseXml',
    value: function parseXml(s) {
      var i = 0;
      while (i < s.length) {
        var ch = s[i];
        var j = i;
        if (ch === '<') {
          ++j;
          var ch2 = s[j];
          var q = void 0;
          switch (ch2) {
            case '/':
              ++j;
              q = s.indexOf('>', j);
              if (q < 0) {
                this.onError(XMLParserErrorCode.UnterminatedElement);
                return;
              }
              this.onEndElement(s.substring(j, q));
              j = q + 1;
              break;
            case '?':
              ++j;
              var pi = this._parseProcessingInstruction(s, j);
              if (s.substring(j + pi.parsed, j + pi.parsed + 2) !== '?>') {
                this.onError(XMLParserErrorCode.UnterminatedXmlDeclaration);
                return;
              }
              this.onPi(pi.name, pi.value);
              j += pi.parsed + 2;
              break;
            case '!':
              if (s.substring(j + 1, j + 3) === '--') {
                q = s.indexOf('-->', j + 3);
                if (q < 0) {
                  this.onError(XMLParserErrorCode.UnterminatedComment);
                  return;
                }
                this.onComment(s.substring(j + 3, q));
                j = q + 3;
              } else if (s.substring(j + 1, j + 8) === '[CDATA[') {
                q = s.indexOf(']]>', j + 8);
                if (q < 0) {
                  this.onError(XMLParserErrorCode.UnterminatedCdat);
                  return;
                }
                this.onCdata(s.substring(j + 8, q));
                j = q + 3;
              } else if (s.substring(j + 1, j + 8) === 'DOCTYPE') {
                var q2 = s.indexOf('[', j + 8);
                var complexDoctype = false;
                q = s.indexOf('>', j + 8);
                if (q < 0) {
                  this.onError(XMLParserErrorCode.UnterminatedDoctypeDeclaration);
                  return;
                }
                if (q2 > 0 && q > q2) {
                  q = s.indexOf(']>', j + 8);
                  if (q < 0) {
                    this.onError(XMLParserErrorCode.UnterminatedDoctypeDeclaration);
                    return;
                  }
                  complexDoctype = true;
                }
                var doctypeContent = s.substring(j + 8, q + (complexDoctype ? 1 : 0));
                this.onDoctype(doctypeContent);
                j = q + (complexDoctype ? 2 : 1);
              } else {
                this.onError(XMLParserErrorCode.MalformedElement);
                return;
              }
              break;
            default:
              var content = this._parseContent(s, j);
              if (content === null) {
                this.onError(XMLParserErrorCode.MalformedElement);
                return;
              }
              var isClosed = false;
              if (s.substring(j + content.parsed, j + content.parsed + 2) === '/>') {
                isClosed = true;
              } else if (s.substring(j + content.parsed, j + content.parsed + 1) !== '>') {
                this.onError(XMLParserErrorCode.UnterminatedElement);
                return;
              }
              this.onBeginElement(content.name, content.attributes, isClosed);
              j += content.parsed + (isClosed ? 2 : 1);
              break;
          }
        } else {
          while (j < s.length && s[j] !== '<') {
            j++;
          }
          var text = s.substring(i, j);
          this.onText(this._resolveEntities(text));
        }
        i = j;
      }
    }
  }, {
    key: 'onResolveEntity',
    value: function onResolveEntity(name) {
      return '&' + name + ';';
    }
  }, {
    key: 'onPi',
    value: function onPi(name, value) {}
  }, {
    key: 'onComment',
    value: function onComment(text) {}
  }, {
    key: 'onCdata',
    value: function onCdata(text) {}
  }, {
    key: 'onDoctype',
    value: function onDoctype(doctypeContent) {}
  }, {
    key: 'onText',
    value: function onText(text) {}
  }, {
    key: 'onBeginElement',
    value: function onBeginElement(name, attributes, isEmpty) {}
  }, {
    key: 'onEndElement',
    value: function onEndElement(name) {}
  }, {
    key: 'onError',
    value: function onError(code) {}
  }]);

  return XMLParserBase;
}();

var SimpleDOMNode = function () {
  function SimpleDOMNode(nodeName, nodeValue) {
    _classCallCheck(this, SimpleDOMNode);

    this.nodeName = nodeName;
    this.nodeValue = nodeValue;
    Object.defineProperty(this, 'parentNode', {
      value: null,
      writable: true
    });
  }

  _createClass(SimpleDOMNode, [{
    key: 'hasChildNodes',
    value: function hasChildNodes() {
      return this.childNodes && this.childNodes.length > 0;
    }
  }, {
    key: 'firstChild',
    get: function get() {
      return this.childNodes[0];
    }
  }, {
    key: 'nextSibling',
    get: function get() {
      var index = this.parentNode.childNodes.indexOf(this);
      return this.parentNode.childNodes[index + 1];
    }
  }, {
    key: 'textContent',
    get: function get() {
      if (!this.childNodes) {
        return this.nodeValue || '';
      }
      return this.childNodes.map(function (child) {
        return child.textContent;
      }).join('');
    }
  }]);

  return SimpleDOMNode;
}();

var SimpleXMLParser = function (_XMLParserBase) {
  _inherits(SimpleXMLParser, _XMLParserBase);

  function SimpleXMLParser() {
    _classCallCheck(this, SimpleXMLParser);

    var _this = _possibleConstructorReturn(this, (SimpleXMLParser.__proto__ || Object.getPrototypeOf(SimpleXMLParser)).call(this));

    _this._currentFragment = null;
    _this._stack = null;
    _this._errorCode = XMLParserErrorCode.NoError;
    return _this;
  }

  _createClass(SimpleXMLParser, [{
    key: 'parseFromString',
    value: function parseFromString(data) {
      this._currentFragment = [];
      this._stack = [];
      this._errorCode = XMLParserErrorCode.NoError;
      this.parseXml(data);
      if (this._errorCode !== XMLParserErrorCode.NoError) {
        return undefined;
      }

      var _currentFragment = _slicedToArray(this._currentFragment, 1),
          documentElement = _currentFragment[0];

      if (!documentElement) {
        return undefined;
      }
      return { documentElement: documentElement };
    }
  }, {
    key: 'onResolveEntity',
    value: function onResolveEntity(name) {
      switch (name) {
        case 'apos':
          return '\'';
      }
      return _get(SimpleXMLParser.prototype.__proto__ || Object.getPrototypeOf(SimpleXMLParser.prototype), 'onResolveEntity', this).call(this, name);
    }
  }, {
    key: 'onText',
    value: function onText(text) {
      if (isWhitespaceString(text)) {
        return;
      }
      var node = new SimpleDOMNode('#text', text);
      this._currentFragment.push(node);
    }
  }, {
    key: 'onCdata',
    value: function onCdata(text) {
      var node = new SimpleDOMNode('#text', text);
      this._currentFragment.push(node);
    }
  }, {
    key: 'onBeginElement',
    value: function onBeginElement(name, attributes, isEmpty) {
      var node = new SimpleDOMNode(name);
      node.childNodes = [];
      this._currentFragment.push(node);
      if (isEmpty) {
        return;
      }
      this._stack.push(this._currentFragment);
      this._currentFragment = node.childNodes;
    }
  }, {
    key: 'onEndElement',
    value: function onEndElement(name) {
      this._currentFragment = this._stack.pop();
      var lastElement = this._currentFragment[this._currentFragment.length - 1];
      for (var i = 0, ii = lastElement.childNodes.length; i < ii; i++) {
        lastElement.childNodes[i].parentNode = lastElement;
      }
    }
  }, {
    key: 'onError',
    value: function onError(code) {
      this._errorCode = code;
    }
  }]);

  return SimpleXMLParser;
}(XMLParserBase);

exports.SimpleXMLParser = SimpleXMLParser;