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Convert PDFDocument._getLinearizationPage to an async method

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This, ever so slightly, simplifies the code and reduces overall indentation.
This commit is contained in:
Jonas Jenwald 2021-11-26 19:57:47 +01:00
parent 080996ac68
commit 4c56214ab4
1 changed files with 19 additions and 22 deletions
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41
src/core/document.js
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@ -1261,7 +1261,7 @@ class PDFDocument {
]); ]);
} }
_getLinearizationPage(pageIndex) { async _getLinearizationPage(pageIndex) {
const { catalog, linearization } = this; const { catalog, linearization } = this;
if ( if (
typeof PDFJSDev === "undefined" || typeof PDFJSDev === "undefined" ||
@ -1274,28 +1274,25 @@ class PDFDocument {
} }
const ref = Ref.get(linearization.objectNumberFirst, 0); const ref = Ref.get(linearization.objectNumberFirst, 0);
return this.xref try {
.fetchAsync(ref) const obj = await this.xref.fetchAsync(ref);
.then(obj => { // Ensure that the object that was found is actually a Page dictionary.
// Ensure that the object that was found is actually a Page dictionary. if (
if ( isDict(obj, "Page") ||
isDict(obj, "Page") || (isDict(obj) && !obj.has("Type") && obj.has("Contents"))
(isDict(obj) && !obj.has("Type") && obj.has("Contents")) ) {
) { if (ref && !catalog.pageKidsCountCache.has(ref)) {
if (ref && !catalog.pageKidsCountCache.has(ref)) { catalog.pageKidsCountCache.put(ref, 1); // Cache the Page reference.
catalog.pageKidsCountCache.put(ref, 1); // Cache the Page reference.
}
return [obj, ref];
} }
throw new FormatError( return [obj, ref];
"The Linearization dictionary doesn't point " + }
"to a valid Page dictionary." throw new FormatError(
); "The Linearization dictionary doesn't point to a valid Page dictionary."
}) );
.catch(reason => { } catch (reason) {
info(reason); info(reason);
return catalog.getPageDict(pageIndex); return catalog.getPageDict(pageIndex);
}); }
} }
getPage(pageIndex) { getPage(pageIndex) {