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| /**
| * @licstart The following is the entire license notice for the
| * JavaScript code in this page
| *
| * Copyright 2022 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
| });
| exports.StructTreeLayerBuilder = void 0;
| const PDF_ROLE_TO_HTML_ROLE = {
| Document: null,
| DocumentFragment: null,
| Part: "group",
| Sect: "group",
| Div: "group",
| Aside: "note",
| NonStruct: "none",
| P: null,
| H: "heading",
| Title: null,
| FENote: "note",
| Sub: "group",
| Lbl: null,
| Span: null,
| Em: null,
| Strong: null,
| Link: "link",
| Annot: "note",
| Form: "form",
| Ruby: null,
| RB: null,
| RT: null,
| RP: null,
| Warichu: null,
| WT: null,
| WP: null,
| L: "list",
| LI: "listitem",
| LBody: null,
| Table: "table",
| TR: "row",
| TH: "columnheader",
| TD: "cell",
| THead: "columnheader",
| TBody: null,
| TFoot: null,
| Caption: null,
| Figure: "figure",
| Formula: null,
| Artifact: null
| };
| const HEADING_PATTERN = /^H(\d+)$/;
|
| class StructTreeLayerBuilder {
| constructor({
| pdfPage
| }) {
| this.pdfPage = pdfPage;
| }
|
| render(structTree) {
| return this._walk(structTree);
| }
|
| _setAttributes(structElement, htmlElement) {
| if (structElement.alt !== undefined) {
| htmlElement.setAttribute("aria-label", structElement.alt);
| }
|
| if (structElement.id !== undefined) {
| htmlElement.setAttribute("aria-owns", structElement.id);
| }
|
| if (structElement.lang !== undefined) {
| htmlElement.setAttribute("lang", structElement.lang);
| }
| }
|
| _walk(node) {
| if (!node) {
| return null;
| }
|
| const element = document.createElement("span");
|
| if ("role" in node) {
| const {
| role
| } = node;
| const match = role.match(HEADING_PATTERN);
|
| if (match) {
| element.setAttribute("role", "heading");
| element.setAttribute("aria-level", match[1]);
| } else if (PDF_ROLE_TO_HTML_ROLE[role]) {
| element.setAttribute("role", PDF_ROLE_TO_HTML_ROLE[role]);
| }
| }
|
| this._setAttributes(node, element);
|
| if (node.children) {
| if (node.children.length === 1 && "id" in node.children[0]) {
| this._setAttributes(node.children[0], element);
| } else {
| for (const kid of node.children) {
| element.append(this._walk(kid));
| }
| }
| }
|
| return element;
| }
|
| }
|
| exports.StructTreeLayerBuilder = StructTreeLayerBuilder;
|
|
