Make MathML elements visible in the struct tree (bug 1937438)
It'll help to make math equations "visible" for screen readers. MS Office has a specific way to add some MathML code to struc tree leaf and this patch handles it.
This commit is contained in:
Calixte Denizet
parent
9f397a632c
commit
e5a62c8d06
@ -16,6 +16,7 @@
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import { AnnotationPrefix, stringToPDFString, warn } from "../shared/util.js";
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import { AnnotationPrefix, stringToPDFString, warn } from "../shared/util.js";
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import { Dict, isName, Name, Ref, RefSetCache } from "./primitives.js";
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import { Dict, isName, Name, Ref, RefSetCache } from "./primitives.js";
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import { lookupNormalRect, stringToAsciiOrUTF16BE } from "./core_utils.js";
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import { lookupNormalRect, stringToAsciiOrUTF16BE } from "./core_utils.js";
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import { BaseStream } from "./base_stream.js";
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import { NumberTree } from "./name_number_tree.js";
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import { NumberTree } from "./name_number_tree.js";
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const MAX_DEPTH = 40;
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const MAX_DEPTH = 40;
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@ -579,6 +580,50 @@ class StructElementNode {
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return root.roleMap.get(name) ?? name;
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return root.roleMap.get(name) ?? name;
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}
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}
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get mathML() {
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let AFs = this.dict.get("AF") || [];
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if (!Array.isArray(AFs)) {
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AFs = [AFs];
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}
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for (let af of AFs) {
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af = this.xref.fetchIfRef(af);
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if (!(af instanceof Dict)) {
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continue;
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}
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if (!isName(af.get("Type"), "Filespec")) {
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continue;
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}
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if (!isName(af.get("AFRelationship"), "Supplement")) {
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continue;
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}
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const ef = af.get("EF");
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if (!(ef instanceof Dict)) {
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continue;
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}
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const fileStream = ef.get("UF") || ef.get("F");
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if (!(fileStream instanceof BaseStream)) {
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continue;
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}
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if (!isName(fileStream.dict.get("Type"), "EmbeddedFile")) {
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continue;
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}
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if (!isName(fileStream.dict.get("Subtype"), "application/mathml+xml")) {
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continue;
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}
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return fileStream.getString();
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}
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const A = this.dict.get("A");
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if (A instanceof Dict) {
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// This stuff isn't in the spec, but MS Office seems to use it.
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const O = A.get("O");
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if (isName(O, "MSFT_Office")) {
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const mathml = A.get("MSFT_MathML");
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return mathml ? stringToPDFString(mathml) : null;
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}
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}
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return null;
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}
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parseKids() {
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parseKids() {
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let pageObjId = null;
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let pageObjId = null;
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const objRef = this.dict.getRaw("Pg");
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const objRef = this.dict.getRaw("Pg");
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@ -842,6 +887,12 @@ class StructTreePage {
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if (typeof alt === "string") {
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if (typeof alt === "string") {
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obj.alt = stringToPDFString(alt);
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obj.alt = stringToPDFString(alt);
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}
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}
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if (obj.role === "Formula") {
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const { mathML } = node;
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if (mathML) {
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obj.mathML = mathML;
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}
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}
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const a = node.dict.get("A");
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const a = node.dict.get("A");
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if (a instanceof Dict) {
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if (a instanceof Dict) {
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@ -658,6 +658,15 @@ class FeatureTest {
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);
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);
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}
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}
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static get isSanitizerSupported() {
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return shadow(
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this,
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"isSanitizerSupported",
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// eslint-disable-next-line no-undef
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typeof Sanitizer !== "undefined"
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);
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}
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static get platform() {
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static get platform() {
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const { platform, userAgent } = navigator;
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const { platform, userAgent } = navigator;
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@ -305,4 +305,72 @@ describe("accessibility", () => {
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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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describe("MathML in AF entry from LaTeX", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug1937438_af_from_latex.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that the MathML is correctly inserted", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const isSanitizerSupported = await page.evaluate(() => {
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try {
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// eslint-disable-next-line no-undef
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return typeof Sanitizer !== "undefined";
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} catch {
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return false;
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}
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});
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if (isSanitizerSupported) {
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const mathML = await page.$eval(
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"span.structTree span[aria-owns='p58R_mc13'] > math",
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el => el?.innerHTML ?? ""
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);
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expect(mathML)
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.withContext(`In ${browserName}`)
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.toEqual(
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" <msqrt><msup><mi>x</mi><mn>2</mn></msup></msqrt> <mo>=</mo> <mrow><mo>|</mo><mi>x</mi><mo>|</mo></mrow> "
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);
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} else {
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pending(`Sanitizer API (in ${browserName}) is not supported`);
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}
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})
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);
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});
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});
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describe("MathML tags in the struct tree", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug1937438_mml_from_latex.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that the MathML is correctly inserted", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const mathML = await page.$eval(
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"span.structTree span[role='group'] span[role='group']:last-child > span math",
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el => el?.innerHTML ?? ""
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);
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expect(mathML)
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.withContext(`In ${browserName}`)
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.toEqual(
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`<mi aria-owns="p76R_mc16"></mi><mo aria-owns="p76R_mc17"></mo><msqrt><mrow><msup><mi aria-owns="p76R_mc18"></mi><mn aria-owns="p76R_mc19"></mn></msup><mo aria-owns="p76R_mc20"></mo><msup><mi aria-owns="p76R_mc21"></mi><mn aria-owns="p76R_mc22"></mn></msup></mrow></msqrt>`
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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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});
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3
test/pdfs/.gitignore
vendored
3
test/pdfs/.gitignore
vendored
@ -749,3 +749,6 @@
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!issue20319_1.pdf
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!issue20319_1.pdf
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!issue20319_2.pdf
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!issue20319_2.pdf
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!bug1992868.pdf
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!bug1992868.pdf
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!bug1937438_af_from_latex.pdf
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!bug1937438_from_word.pdf
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!bug1937438_mml_from_latex.pdf
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965
test/pdfs/bug1937438_af_from_latex.pdf
Executable file
965
test/pdfs/bug1937438_af_from_latex.pdf
Executable file
@ -0,0 +1,965 @@
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%PDF-2.0
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%ÌÕÁÔÅØÐÄÆ
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22 0 obj
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<< /Type /EmbeddedFile /Subtype /application#2Fmathml+xml /Params<</ModDate (D:20240223) >> /Length 25 >>
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stream
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<math> <mi>x</mi> </math>
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endstream
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endobj
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23 0 obj
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<< /Type /Filespec /AFRelationship /Supplement /Desc (mathml-1) /F <FEFF006D006100740068006D006C002D0031002E0078006D006C> /UF <FEFF006D006100740068006D006C002D0031002E0078006D006C> /EF<</F 22 0 R/UF 22 0 R>> >>
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endobj
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24 0 obj
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<< /Type /EmbeddedFile /Subtype /application#2Fmathml+xml /Params<</ModDate (D:20240223) >> /Length 25 >>
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stream
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<math> <mi>y</mi> </math>
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endstream
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endobj
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25 0 obj
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<< /Type /Filespec /AFRelationship /Supplement /Desc (mathml-2) /F <FEFF006D006100740068006D006C002D0032002E0078006D006C> /UF <FEFF006D006100740068006D006C002D0032002E0078006D006C> /EF<</F 24 0 R/UF 24 0 R>> >>
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endobj
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26 0 obj
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<< /Type /EmbeddedFile /Subtype /application#2Fmathml+xml /Params<</ModDate (D:20240223) >> /Length 50 >>
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stream
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<math> <mi>x</mi> <mo>></mo> <mi>y</mi> </math>
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endstream
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endobj
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27 0 obj
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<< /Type /Filespec /AFRelationship /Supplement /Desc (mathml-3) /F <FEFF006D006100740068006D006C002D0033002E0078006D006C> /UF <FEFF006D006100740068006D006C002D0033002E0078006D006C> /EF<</F 26 0 R/UF 26 0 R>> >>
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endobj
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28 0 obj
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<< /Type /EmbeddedFile /Subtype /application#2Fmathml+xml /Params<</ModDate (D:20240223) >> /Length 154 >>
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stream
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<math> <msqrt><msup><mi>x</mi><mn>2</mn></msup></msqrt> <mo>=</mo> <mrow intent="absolute-value($x)"><mo>|</mo><mi arg="x">x</mi><mo>|</mo></mrow> </math>
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endstream
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endobj
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29 0 obj
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<< /Type /Filespec /AFRelationship /Supplement /Desc (mathml-4) /F <FEFF006D006100740068006D006C002D0034002E0078006D006C> /UF <FEFF006D006100740068006D006C002D0034002E0078006D006C> /EF<</F 28 0 R/UF 28 0 R>> >>
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endobj
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43 0 obj
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<< /Subtype /application#2Fx-tex/Type /EmbeddedFile /Params<</ModDate (D:20240223) >> /Length 3 >>
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stream
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$x$
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endstream
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endobj
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44 0 obj
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<< /Type /Filespec /AFRelationship /Source /Desc (TeX source) /F <FEFF007400610067002D0041004600660069006C00650031002E007400650078> /UF <FEFF007400610067002D0041004600660069006C00650031002E007400650078> /EF<</F 43 0 R/UF 43 0 R>> >>
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endobj
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46 0 obj
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<< /Subtype /application#2Fx-tex/Type /EmbeddedFile /Params<</ModDate (D:20240223) >> /Length 3 >>
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stream
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$y$
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endstream
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endobj
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47 0 obj
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<< /Type /Filespec /AFRelationship /Source /Desc (TeX source) /F <FEFF007400610067002D0041004600660069006C00650032002E007400650078> /UF <FEFF007400610067002D0041004600660069006C00650032002E007400650078> /EF<</F 46 0 R/UF 46 0 R>> >>
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endobj
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49 0 obj
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<< /Subtype /application#2Fx-tex/Type /EmbeddedFile /Params<</ModDate (D:20240223) >> /Length 5 >>
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stream
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$x>y$
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endstream
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endobj
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50 0 obj
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<< /Type /Filespec /AFRelationship /Source /Desc (TeX source) /F <FEFF007400610067002D0041004600660069006C00650033002E007400650078> /UF <FEFF007400610067002D0041004600660069006C00650033002E007400650078> /EF<</F 49 0 R/UF 49 0 R>> >>
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endobj
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54 0 obj
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<< /Subtype /application#2Fx-tex/Type /EmbeddedFile /Params<</ModDate (D:20240223) >> /Length 61 >>
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stream
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\begin {equation*}\sqrt {x^2}=\lvert x\rvert \end {equation*}
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endstream
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endobj
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55 0 obj
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<< /Type /Filespec /AFRelationship /Source /Desc (TeX source) /F <FEFF007400610067002D0041004600660069006C00650034002E007400650078> /UF <FEFF007400610067002D0041004600660069006C00650034002E007400650078> /EF<</F 54 0 R/UF 54 0 R>> >>
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endobj
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56 0 obj
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<< /Type /Metadata /Subtype /XML /Length 11660 >>
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stream
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<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
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<x:xmpmeta xmlns:x="adobe:ns:meta/">
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
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<rdf:Description rdf:about=""
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xmlns:pdf="http://ns.adobe.com/pdf/1.3/"
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xmlns:xmpRights="http://ns.adobe.com/xap/1.0/rights/"
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|
xmlns:dc="http://purl.org/dc/elements/1.1/"
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|
xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
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|
xmlns:xmp="http://ns.adobe.com/xap/1.0/"
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xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"
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xmlns:stEvt="http://ns.adobe.com/xap/1.0/sType/ResourceEvent#"
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|
xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/"
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|
xmlns:pdfuaid="http://www.aiim.org/pdfua/ns/id/"
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|
xmlns:pdfx="http://ns.adobe.com/pdfx/1.3/"
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|
xmlns:pdfxid="http://www.npes.org/pdfx/ns/id/"
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|
xmlns:prism="http://prismstandard.org/namespaces/basic/3.0/"
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|
xmlns:stFnt="http://ns.adobe.com/xap/1.0/sType/Font#"
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|
xmlns:Iptc4xmpCore="http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/"
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|
xmlns:pdfaExtension="http://www.aiim.org/pdfa/ns/extension/"
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xmlns:pdfaSchema="http://www.aiim.org/pdfa/ns/schema#"
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xmlns:pdfaProperty="http://www.aiim.org/pdfa/ns/property#"
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xmlns:pdfaType="http://www.aiim.org/pdfa/ns/type#"
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xmlns:pdfaField="http://www.aiim.org/pdfa/ns/field#">
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<pdfaExtension:schemas>
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<rdf:Bag>
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<rdf:li rdf:parseType="Resource">
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<pdfaSchema:schema>XMP Media Management Schema</pdfaSchema:schema>
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|
<pdfaSchema:prefix>xmpMM</pdfaSchema:prefix>
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<pdfaSchema:namespaceURI>http://ns.adobe.com/xap/1.0/mm/</pdfaSchema:namespaceURI>
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<pdfaSchema:property>
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<rdf:Seq>
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<rdf:li rdf:parseType="Resource">
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<pdfaProperty:name>OriginalDocumentID</pdfaProperty:name>
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<pdfaProperty:valueType>URI</pdfaProperty:valueType>
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<pdfaProperty:category>internal</pdfaProperty:category>
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<pdfaProperty:description>The common identifier for all versions and renditions of a document.</pdfaProperty:description>
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</rdf:li>
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</rdf:Seq>
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</pdfaSchema:property>
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</rdf:li>
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<rdf:li rdf:parseType="Resource">
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<pdfaSchema:schema>PDF/A Identification Schema</pdfaSchema:schema>
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<pdfaSchema:prefix>pdfaid</pdfaSchema:prefix>
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<pdfaSchema:namespaceURI>http://www.aiim.org/pdfa/ns/id/</pdfaSchema:namespaceURI>
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<pdfaSchema:property>
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<rdf:Seq>
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<rdf:li rdf:parseType="Resource">
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<pdfaProperty:name>year</pdfaProperty:name>
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<pdfaProperty:valueType>Integer</pdfaProperty:valueType>
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<pdfaProperty:category>internal</pdfaProperty:category>
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<pdfaProperty:description>Year of standard</pdfaProperty:description>
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</rdf:li>
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</rdf:Seq>
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</pdfaSchema:property>
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</rdf:li>
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<rdf:li rdf:parseType="Resource">
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<pdfaSchema:schema>PDF/UA Universal Accessibility Schema</pdfaSchema:schema>
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<pdfaSchema:prefix>pdfuaid</pdfaSchema:prefix>
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||||||
|
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0000020609 00000 n
|
||||||
|
0000000020 00000 n
|
||||||
|
0000000194 00000 n
|
||||||
|
0000000421 00000 n
|
||||||
|
0000000595 00000 n
|
||||||
|
0000000822 00000 n
|
||||||
|
0000001021 00000 n
|
||||||
|
0000001248 00000 n
|
||||||
|
0000001551 00000 n
|
||||||
|
0000020716 00000 n
|
||||||
|
0000020804 00000 n
|
||||||
|
0000020892 00000 n
|
||||||
|
0000021008 00000 n
|
||||||
|
0000021104 00000 n
|
||||||
|
0000021238 00000 n
|
||||||
|
0000021372 00000 n
|
||||||
|
0000021506 00000 n
|
||||||
|
0000021617 00000 n
|
||||||
|
0000021752 00000 n
|
||||||
|
0000021877 00000 n
|
||||||
|
0000021977 00000 n
|
||||||
|
0000022241 00000 n
|
||||||
|
0000001778 00000 n
|
||||||
|
0000001924 00000 n
|
||||||
|
0000022424 00000 n
|
||||||
|
0000002173 00000 n
|
||||||
|
0000002319 00000 n
|
||||||
|
0000022607 00000 n
|
||||||
|
0000002568 00000 n
|
||||||
|
0000002716 00000 n
|
||||||
|
0000022791 00000 n
|
||||||
|
0000022900 00000 n
|
||||||
|
0000023036 00000 n
|
||||||
|
0000002965 00000 n
|
||||||
|
0000003169 00000 n
|
||||||
|
0000003418 00000 n
|
||||||
|
0000017453 00000 n
|
||||||
|
0000017318 00000 n
|
||||||
|
0000015168 00000 n
|
||||||
|
0000036975 00000 n
|
||||||
|
0000030881 00000 n
|
||||||
|
0000027812 00000 n
|
||||||
|
0000025172 00000 n
|
||||||
|
0000037333 00000 n
|
||||||
|
0000017599 00000 n
|
||||||
|
0000017635 00000 n
|
||||||
|
0000017680 00000 n
|
||||||
|
0000017916 00000 n
|
||||||
|
0000018279 00000 n
|
||||||
|
0000018895 00000 n
|
||||||
|
0000023378 00000 n
|
||||||
|
0000024187 00000 n
|
||||||
|
0000023411 00000 n
|
||||||
|
0000024410 00000 n
|
||||||
|
0000025328 00000 n
|
||||||
|
0000025530 00000 n
|
||||||
|
0000026749 00000 n
|
||||||
|
0000025619 00000 n
|
||||||
|
0000026972 00000 n
|
||||||
|
0000027968 00000 n
|
||||||
|
0000028170 00000 n
|
||||||
|
0000029803 00000 n
|
||||||
|
0000028287 00000 n
|
||||||
|
0000030022 00000 n
|
||||||
|
0000031034 00000 n
|
||||||
|
0000031233 00000 n
|
||||||
|
0000035542 00000 n
|
||||||
|
0000031499 00000 n
|
||||||
|
0000035764 00000 n
|
||||||
|
0000037131 00000 n
|
||||||
|
0000037395 00000 n
|
||||||
|
0000037439 00000 n
|
||||||
|
0000037596 00000 n
|
||||||
|
trailer
|
||||||
|
<< /Size 94 /Root 92 0 R /Info 93 0 R /ID [ <FF177D4E73343DCABFFA5B68FA754EE0> <FF177D4E73343DCABFFA5B68FA754EE0> ] >>
|
||||||
|
startxref
|
||||||
|
37906
|
||||||
|
%%EOF
|
||||||
BIN
test/pdfs/bug1937438_from_word.pdf
Executable file
BIN
test/pdfs/bug1937438_from_word.pdf
Executable file
Binary file not shown.
BIN
test/pdfs/bug1937438_mml_from_latex.pdf
Executable file
BIN
test/pdfs/bug1937438_mml_from_latex.pdf
Executable file
Binary file not shown.
@ -21,6 +21,7 @@ function equalTrees(rootA, rootB) {
|
|||||||
expect(a.role).toEqual(b.role);
|
expect(a.role).toEqual(b.role);
|
||||||
expect(a.lang).toEqual(b.lang);
|
expect(a.lang).toEqual(b.lang);
|
||||||
expect(a.type).toEqual(b.type);
|
expect(a.type).toEqual(b.type);
|
||||||
|
expect(a.mathML).toEqual(b.mathML);
|
||||||
expect("children" in a).toEqual("children" in b);
|
expect("children" in a).toEqual("children" in b);
|
||||||
if (!a.children) {
|
if (!a.children) {
|
||||||
return;
|
return;
|
||||||
@ -151,4 +152,154 @@ describe("struct tree", function () {
|
|||||||
);
|
);
|
||||||
await loadingTask.destroy();
|
await loadingTask.destroy();
|
||||||
});
|
});
|
||||||
|
|
||||||
|
it("parses structure with some MathML in AF dictionary", async function () {
|
||||||
|
const filename = "bug1937438_af_from_latex.pdf";
|
||||||
|
const params = buildGetDocumentParams(filename);
|
||||||
|
const loadingTask = getDocument(params);
|
||||||
|
const doc = await loadingTask.promise;
|
||||||
|
const page = await doc.getPage(1);
|
||||||
|
const struct = await page.getStructTree();
|
||||||
|
equalTrees(
|
||||||
|
{
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "Document",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "Part",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "P",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "P",
|
||||||
|
children: [{ type: "content", id: "p58R_mc0" }],
|
||||||
|
},
|
||||||
|
],
|
||||||
|
},
|
||||||
|
{
|
||||||
|
role: "P",
|
||||||
|
children: [{ type: "content", id: "p58R_mc1" }],
|
||||||
|
},
|
||||||
|
{
|
||||||
|
role: "P",
|
||||||
|
children: [{ type: "content", id: "p58R_mc2" }],
|
||||||
|
},
|
||||||
|
],
|
||||||
|
},
|
||||||
|
{
|
||||||
|
role: "Sect",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "H1",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "Lbl",
|
||||||
|
children: [{ type: "content", id: "p58R_mc3" }],
|
||||||
|
},
|
||||||
|
{ type: "content", id: "p58R_mc4" },
|
||||||
|
],
|
||||||
|
},
|
||||||
|
{
|
||||||
|
role: "Part",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "P",
|
||||||
|
children: [
|
||||||
|
{ type: "content", id: "p58R_mc5" },
|
||||||
|
{
|
||||||
|
role: "Formula",
|
||||||
|
children: [{ type: "content", id: "p58R_mc6" }],
|
||||||
|
mathML: "<math> <mi>x</mi> </math>",
|
||||||
|
},
|
||||||
|
{ type: "content", id: "p58R_mc7" },
|
||||||
|
{
|
||||||
|
role: "Formula",
|
||||||
|
children: [{ type: "content", id: "p58R_mc8" }],
|
||||||
|
mathML: "<math> <mi>y</mi> </math>",
|
||||||
|
},
|
||||||
|
{ type: "content", id: "p58R_mc9" },
|
||||||
|
{
|
||||||
|
role: "Formula",
|
||||||
|
children: [{ type: "content", id: "p58R_mc10" }],
|
||||||
|
mathML:
|
||||||
|
"<math> <mi>x</mi> <mo>></mo> <mi>y</mi> </math>",
|
||||||
|
},
|
||||||
|
{ type: "content", id: "p58R_mc11" },
|
||||||
|
],
|
||||||
|
},
|
||||||
|
],
|
||||||
|
},
|
||||||
|
{
|
||||||
|
role: "Part",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "P",
|
||||||
|
children: [{ type: "content", id: "p58R_mc12" }],
|
||||||
|
},
|
||||||
|
{
|
||||||
|
role: "Formula",
|
||||||
|
children: [{ type: "content", id: "p58R_mc13" }],
|
||||||
|
mathML:
|
||||||
|
'<math> <msqrt><msup><mi>x</mi><mn>2</mn></msup></msqrt> <mo>=</mo> <mrow intent="absolute-value($x)"><mo>|</mo><mi arg="x">x</mi><mo>|</mo></mrow> </math>',
|
||||||
|
},
|
||||||
|
],
|
||||||
|
},
|
||||||
|
],
|
||||||
|
},
|
||||||
|
],
|
||||||
|
},
|
||||||
|
],
|
||||||
|
role: "Root",
|
||||||
|
},
|
||||||
|
struct
|
||||||
|
);
|
||||||
|
await loadingTask.destroy();
|
||||||
|
});
|
||||||
|
|
||||||
|
it("parses structure with some MathML in MS Office specific entry", async function () {
|
||||||
|
const filename = "bug1937438_from_word.pdf";
|
||||||
|
const params = buildGetDocumentParams(filename);
|
||||||
|
const loadingTask = getDocument(params);
|
||||||
|
const doc = await loadingTask.promise;
|
||||||
|
const page = await doc.getPage(1);
|
||||||
|
const struct = await page.getStructTree();
|
||||||
|
equalTrees(
|
||||||
|
{
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "Document",
|
||||||
|
children: [
|
||||||
|
{
|
||||||
|
role: "P",
|
||||||
|
children: [
|
||||||
|
{ type: "content", id: "p3R_mc0" },
|
||||||
|
{
|
||||||
|
role: "Formula",
|
||||||
|
children: [{ type: "content", id: "p3R_mc1" }],
|
||||||
|
alt: "pi",
|
||||||
|
mathML: '<math display="block"><mi>𝜋</mi></math>',
|
||||||
|
},
|
||||||
|
{ type: "content", id: "p3R_mc2" },
|
||||||
|
],
|
||||||
|
},
|
||||||
|
{
|
||||||
|
role: "Formula",
|
||||||
|
children: [{ type: "content", id: "p3R_mc3" }],
|
||||||
|
alt: "6 sum from n equals 1 to infinity of 1 over n squared , equals pi squared",
|
||||||
|
mathML:
|
||||||
|
'<math display="block"><mn>6</mn><mrow><munderover><mo stretchy="false">∑</mo><mrow><mi>n</mi><mo>=</mo><mn>1</mn></mrow><mo>∞</mo></munderover><mfrac><mn>1</mn><msup><mrow><mi>n</mi></mrow><mn>2</mn></msup></mfrac></mrow><mo>=</mo><msup><mrow><mi>𝜋</mi></mrow><mn>2</mn></msup></math>',
|
||||||
|
},
|
||||||
|
{ role: "P", children: [{ type: "content", id: "p3R_mc4" }] },
|
||||||
|
{ role: "P", children: [{ type: "content", id: "p3R_mc5" }] },
|
||||||
|
],
|
||||||
|
},
|
||||||
|
],
|
||||||
|
role: "Root",
|
||||||
|
},
|
||||||
|
struct
|
||||||
|
);
|
||||||
|
await loadingTask.destroy();
|
||||||
|
});
|
||||||
});
|
});
|
||||||
|
|||||||
@ -15,6 +15,7 @@
|
|||||||
|
|
||||||
/** @typedef {import("../src/display/api").PDFPageProxy} PDFPageProxy */
|
/** @typedef {import("../src/display/api").PDFPageProxy} PDFPageProxy */
|
||||||
|
|
||||||
|
import { FeatureTest, shadow } from "pdfjs-lib";
|
||||||
import { removeNullCharacters } from "./ui_utils.js";
|
import { removeNullCharacters } from "./ui_utils.js";
|
||||||
|
|
||||||
const PDF_ROLE_TO_HTML_ROLE = {
|
const PDF_ROLE_TO_HTML_ROLE = {
|
||||||
@ -73,6 +74,98 @@ const PDF_ROLE_TO_HTML_ROLE = {
|
|||||||
Artifact: null,
|
Artifact: null,
|
||||||
};
|
};
|
||||||
|
|
||||||
|
const MathMLElements = new Set([
|
||||||
|
"math",
|
||||||
|
"merror",
|
||||||
|
"mfrac",
|
||||||
|
"mi",
|
||||||
|
"mmultiscripts",
|
||||||
|
"mn",
|
||||||
|
"mo",
|
||||||
|
"mover",
|
||||||
|
"mpadded",
|
||||||
|
"mprescripts",
|
||||||
|
"mroot",
|
||||||
|
"mrow",
|
||||||
|
"ms",
|
||||||
|
"mspace",
|
||||||
|
"msqrt",
|
||||||
|
"mstyle",
|
||||||
|
"msub",
|
||||||
|
"msubsup",
|
||||||
|
"msup",
|
||||||
|
"mtable",
|
||||||
|
"mtd",
|
||||||
|
"mtext",
|
||||||
|
"mtr",
|
||||||
|
"munder",
|
||||||
|
"munderover",
|
||||||
|
"semantics",
|
||||||
|
]);
|
||||||
|
const MathMLNamespace = "http://www.w3.org/1998/Math/MathML";
|
||||||
|
|
||||||
|
class MathMLSanitizer {
|
||||||
|
static get sanitizer() {
|
||||||
|
// From https://w3c.github.io/mathml-docs/mathml-safe-list.
|
||||||
|
|
||||||
|
return shadow(
|
||||||
|
this,
|
||||||
|
"sanitizer",
|
||||||
|
FeatureTest.isSanitizerSupported
|
||||||
|
? // eslint-disable-next-line no-undef
|
||||||
|
new Sanitizer({
|
||||||
|
elements: [...MathMLElements].map(name => ({
|
||||||
|
name,
|
||||||
|
namespace: MathMLNamespace,
|
||||||
|
})),
|
||||||
|
replaceWithChildrenElements: [
|
||||||
|
{
|
||||||
|
name: "maction",
|
||||||
|
namespace: MathMLNamespace,
|
||||||
|
},
|
||||||
|
],
|
||||||
|
attributes: [
|
||||||
|
"dir",
|
||||||
|
"displaystyle",
|
||||||
|
"mathbackground",
|
||||||
|
"mathcolor",
|
||||||
|
"mathsize",
|
||||||
|
"scriptlevel",
|
||||||
|
"encoding",
|
||||||
|
"display",
|
||||||
|
"linethickness",
|
||||||
|
"intent",
|
||||||
|
"arg",
|
||||||
|
"form",
|
||||||
|
"fence",
|
||||||
|
"separator",
|
||||||
|
"lspace",
|
||||||
|
"rspace",
|
||||||
|
"stretchy",
|
||||||
|
"symmetric",
|
||||||
|
"maxsize",
|
||||||
|
"minsize",
|
||||||
|
"largeop",
|
||||||
|
"movablelimits",
|
||||||
|
"width",
|
||||||
|
"height",
|
||||||
|
"depth",
|
||||||
|
"voffset",
|
||||||
|
"accent",
|
||||||
|
"accentunder",
|
||||||
|
"columnspan",
|
||||||
|
"rowspan",
|
||||||
|
].map(name => ({
|
||||||
|
name,
|
||||||
|
namespace: MathMLNamespace,
|
||||||
|
})),
|
||||||
|
comments: false,
|
||||||
|
})
|
||||||
|
: null
|
||||||
|
);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
const HEADING_PATTERN = /^H(\d+)$/;
|
const HEADING_PATTERN = /^H(\d+)$/;
|
||||||
|
|
||||||
/**
|
/**
|
||||||
@ -230,9 +323,12 @@ class StructTreeLayerBuilder {
|
|||||||
return null;
|
return null;
|
||||||
}
|
}
|
||||||
|
|
||||||
const element = document.createElement("span");
|
let element;
|
||||||
if ("role" in node) {
|
if ("role" in node) {
|
||||||
const { role } = node;
|
const { role } = node;
|
||||||
|
element = MathMLElements.has(role)
|
||||||
|
? document.createElementNS(MathMLNamespace, role)
|
||||||
|
: document.createElement("span");
|
||||||
const match = role.match(HEADING_PATTERN);
|
const match = role.match(HEADING_PATTERN);
|
||||||
if (match) {
|
if (match) {
|
||||||
element.setAttribute("role", "heading");
|
element.setAttribute("role", "heading");
|
||||||
@ -243,7 +339,23 @@ class StructTreeLayerBuilder {
|
|||||||
if (role === "Figure" && this.#addImageInTextLayer(node, element)) {
|
if (role === "Figure" && this.#addImageInTextLayer(node, element)) {
|
||||||
return element;
|
return element;
|
||||||
}
|
}
|
||||||
|
if (role === "Formula") {
|
||||||
|
if (node.mathML && MathMLSanitizer.sanitizer) {
|
||||||
|
element.setHTML(node.mathML, {
|
||||||
|
sanitizer: MathMLSanitizer.sanitizer,
|
||||||
|
});
|
||||||
}
|
}
|
||||||
|
if (
|
||||||
|
!node.mathML &&
|
||||||
|
node.children.length === 1 &&
|
||||||
|
node.children[0].role !== "math"
|
||||||
|
) {
|
||||||
|
element = document.createElementNS(MathMLNamespace, "math");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
element ||= document.createElement("span");
|
||||||
|
|
||||||
this.#setAttributes(node, element);
|
this.#setAttributes(node, element);
|
||||||
|
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user