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[api-minor] Include the /Lang-property in the documentInfo, and use it in the viewer (issue 14110)

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*Please note:* This is a tentative patch, since I don't have the necessary a11y-software to actually test it.

To avoid having to add a new API-method just for a single string, I figured that adding the new property to the existing `documentInfo`-data (accessed via `PDFDocumentProxy.getMetadata` in the API) will hopefully be deemed acceptable.
This commit is contained in:
Jonas Jenwald 2021-10-11 15:55:16 +02:00
parent 52fce0d17b
commit 00720d059a
4 changed files with 17 additions and 0 deletions
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9
src/core/catalog.js
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@ -89,6 +89,15 @@ class Catalog {
);
}
get lang() {
const lang = this._catDict.get("Lang");
return shadow(
this,
"lang",
typeof lang === "string" ? stringToPDFString(lang) : null
);
}
/**
* @type {boolean} `true` for pure XFA documents,
* `false` for XFA Foreground documents.

1
src/core/document.js
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@ -1160,6 +1160,7 @@ class PDFDocument {
const docInfo = {
PDFFormatVersion: version,
Language: this.catalog.lang,
IsLinearized: !!this.linearization,
IsAcroFormPresent: this.formInfo.hasAcroForm,
IsXFAPresent: this.formInfo.hasXfa,

3
test/unit/api_spec.js
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@ -1161,6 +1161,7 @@ describe("api", function () {
expect(info.Custom).toEqual(undefined);
// The following are PDF.js specific, non-standard, properties.
expect(info.PDFFormatVersion).toEqual("1.7");
expect(info.Language).toEqual("en");
expect(info.IsLinearized).toEqual(false);
expect(info.IsAcroFormPresent).toEqual(false);
expect(info.IsXFAPresent).toEqual(false);
@ -1195,6 +1196,7 @@ describe("api", function () {
);
// The following are PDF.js specific, non-standard, properties.
expect(info.PDFFormatVersion).toEqual("1.4");
expect(info.Language).toEqual(null);
expect(info.IsLinearized).toEqual(false);
expect(info.IsAcroFormPresent).toEqual(false);
expect(info.IsXFAPresent).toEqual(false);
@ -1216,6 +1218,7 @@ describe("api", function () {
// The following are PDF.js specific, non-standard, properties.
expect(info.PDFFormatVersion).toEqual(null);
expect(info.Language).toEqual(null);
expect(info.IsLinearized).toEqual(false);
expect(info.IsAcroFormPresent).toEqual(false);
expect(info.IsXFAPresent).toEqual(false);

4
web/app.js
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@ -812,6 +812,7 @@ const PDFViewerApplication = {
const { container } = this.appConfig.errorWrapper;
container.hidden = true;
}
this.appConfig.viewerContainer.removeAttribute("lang");
if (!this.pdfLoadingTask) {
return;
@ -1536,6 +1537,9 @@ const PDFViewerApplication = {
`(PDF.js: ${version || "-"})`
);
if (info.Language) {
this.appConfig.viewerContainer.lang = info.Language;
}
let pdfTitle = info?.Title;
const metadataTitle = metadata?.get("dc:title");