fc9501a637
When a PDF is "marked" we now generate a separate DOM that represents the structure tree from the PDF. This DOM is inserted into the <canvas> element and allows screen readers to walk the tree and have more information about headings, images, links, etc. To link the structure tree DOM (which is empty) to the text layer aria-owns is used. This required modifying the text layer creation so that marked items are now tracked.
109 lines
3.2 KiB
JavaScript
109 lines
3.2 KiB
JavaScript
/* Copyright 2021 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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import { buildGetDocumentParams } from "./test_utils.js";
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import { getDocument } from "../../src/display/api.js";
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function equalTrees(rootA, rootB) {
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function walk(a, b) {
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expect(a.role).toEqual(b.role);
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expect(a.type).toEqual(b.type);
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expect("children" in a).toEqual("children" in b);
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if (!a.children) {
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return;
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}
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expect(a.children.length).toEqual(b.children.length);
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for (let i = 0; i < rootA.children.length; i++) {
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walk(a.children[i], b.children[i]);
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}
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}
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return walk(rootA, rootB);
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}
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describe("struct tree", function () {
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describe("getStructTree", function () {
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it("parses basic structure", async function () {
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const filename = "structure_simple.pdf";
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const params = buildGetDocumentParams(filename);
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const loadingTask = getDocument(params);
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const doc = await loadingTask.promise;
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const page = await doc.getPage(1);
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const struct = await page.getStructTree();
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equalTrees(
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{
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role: "Root",
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children: [
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{
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role: "Document",
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children: [
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{
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role: "H1",
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children: [
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{ role: "NonStruct", children: [{ type: "content" }] },
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],
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},
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{
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role: "P",
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children: [
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{ role: "NonStruct", children: [{ type: "content" }] },
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],
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},
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{
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role: "H2",
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children: [
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{ role: "NonStruct", children: [{ type: "content" }] },
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],
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},
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{
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role: "P",
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children: [
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{ role: "NonStruct", children: [{ type: "content" }] },
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],
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},
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],
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},
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],
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},
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struct
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);
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await loadingTask.destroy();
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});
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it("parses structure with marked content reference", async function () {
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const filename = "issue6782.pdf";
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const params = buildGetDocumentParams(filename);
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const loadingTask = getDocument(params);
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const doc = await loadingTask.promise;
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const page = await doc.getPage(1);
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const struct = await page.getStructTree();
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equalTrees(
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{
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role: "Root",
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children: [
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{
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role: "Part",
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children: [
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{ role: "P", children: Array(27).fill({ type: "content" }) },
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],
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},
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],
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},
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struct
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);
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await loadingTask.destroy();
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});
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});
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});
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