pdf.js/src/core/xfa/factory.js

/* Copyright 2021 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.
 */

import { $fonts, $toHTML } from "./xfa_object.js";
import { Binder } from "./bind.js";
import { warn } from "../../shared/util.js";
import { XFAParser } from "./parser.js";

class XFAFactory {
  constructor(data) {
    try {
      this.root = new XFAParser().parse(XFAFactory._createDocument(data));
      this.form = new Binder(this.root).bind();
    } catch (e) {
      warn(`XFA - an error occured during parsing and binding: ${e}`);
    }
  }

  isValid() {
    return this.root && this.form;
  }

  _createPages() {
    try {
      this.pages = this.form[$toHTML]();
      this.dims = this.pages.children.map(c => {
        const { width, height } = c.attributes.style;
        return [0, 0, parseInt(width), parseInt(height)];
      });
    } catch (e) {
      warn(`XFA - an error occured during layout: ${e}`);
    }
  }

  getBoundingBox(pageIndex) {
    return this.dims[pageIndex];
  }

  get numberPages() {
    if (!this.pages) {
      this._createPages();
    }
    return this.dims.length;
  }

  setFonts(fonts) {
    this.form[$fonts] = Object.create(null);
    for (const font of fonts) {
      const cssFontInfo = font.cssFontInfo;
      const name = cssFontInfo.fontFamily;
      if (!this.form[$fonts][name]) {
        this.form[$fonts][name] = Object.create(null);
      }
      let property = "regular";
      if (cssFontInfo.italicAngle !== "0") {
        if (parseFloat(cssFontInfo.fontWeight) >= 700) {
          property = "bolditalic";
        } else {
          property = "italic";
        }
      } else if (parseFloat(cssFontInfo.fontWeight) >= 700) {
        property = "bold";
      }

      this.form[$fonts][name][property] = font;
    }
  }

  getPages() {
    if (!this.pages) {
      this._createPages();
    }
    const pages = this.pages;
    this.pages = null;
    return pages;
  }

  static _createDocument(data) {
    if (!data["/xdp:xdp"]) {
      return data["xdp:xdp"];
    }
    return Object.values(data).join("");
  }
}

export { XFAFactory };