135 lines
3.0 KiB
JavaScript
135 lines
3.0 KiB
JavaScript
/**
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* @licstart The following is the entire license notice for the
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* JavaScript code in this page
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*
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* Copyright 2022 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @licend The above is the entire license notice for the
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* JavaScript code in this page
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*/
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.StructTreeLayerBuilder = void 0;
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const PDF_ROLE_TO_HTML_ROLE = {
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Document: null,
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DocumentFragment: null,
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Part: "group",
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Sect: "group",
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Div: "group",
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Aside: "note",
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NonStruct: "none",
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P: null,
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H: "heading",
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Title: null,
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FENote: "note",
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Sub: "group",
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Lbl: null,
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Span: null,
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Em: null,
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Strong: null,
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Link: "link",
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Annot: "note",
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Form: "form",
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Ruby: null,
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RB: null,
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RT: null,
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RP: null,
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Warichu: null,
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WT: null,
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WP: null,
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L: "list",
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LI: "listitem",
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LBody: null,
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Table: "table",
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TR: "row",
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TH: "columnheader",
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TD: "cell",
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THead: "columnheader",
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TBody: null,
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TFoot: null,
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Caption: null,
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Figure: "figure",
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Formula: null,
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Artifact: null
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};
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const HEADING_PATTERN = /^H(\d+)$/;
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class StructTreeLayerBuilder {
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constructor({
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pdfPage
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}) {
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this.pdfPage = pdfPage;
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}
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render(structTree) {
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return this._walk(structTree);
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}
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_setAttributes(structElement, htmlElement) {
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if (structElement.alt !== undefined) {
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htmlElement.setAttribute("aria-label", structElement.alt);
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}
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if (structElement.id !== undefined) {
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htmlElement.setAttribute("aria-owns", structElement.id);
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}
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if (structElement.lang !== undefined) {
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htmlElement.setAttribute("lang", structElement.lang);
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}
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}
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_walk(node) {
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if (!node) {
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return null;
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}
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const element = document.createElement("span");
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if ("role" in node) {
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const {
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role
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} = node;
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const match = role.match(HEADING_PATTERN);
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if (match) {
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element.setAttribute("role", "heading");
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element.setAttribute("aria-level", match[1]);
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} else if (PDF_ROLE_TO_HTML_ROLE[role]) {
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element.setAttribute("role", PDF_ROLE_TO_HTML_ROLE[role]);
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}
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}
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this._setAttributes(node, element);
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if (node.children) {
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if (node.children.length === 1 && "id" in node.children[0]) {
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this._setAttributes(node.children[0], element);
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} else {
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for (const kid of node.children) {
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element.append(this._walk(kid));
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}
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}
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}
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return element;
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}
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}
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exports.StructTreeLayerBuilder = StructTreeLayerBuilder; |