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Add support for async/await using Babel

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For proof-of-concept, this patch converts a couple of `Promise` returning methods to use `async` instead.
Please note that the `generic` build, based on this patch, has been successfully testing in IE11 (i.e. the viewer loads and nothing is obviously broken).

Being able to use modern JavaScript features like `async`/`await` is a huge plus, but there's one (obvious) side-effect: The size of the built files will increase slightly (unless `SKIP_BABEL == true`). That's unavoidable, but seems like a small price to pay in the grand scheme of things.

Finally, note that the `chromium` build target was changed to no longer skip Babel translation, since the Chrome extension still supports version `49` of the browser (where native `async` support isn't available).
This commit is contained in:
Jonas Jenwald 2018-07-30 13:58:09 +02:00
parent 4ea663aa8a
commit 099ed08852
13 changed files with 159 additions and 179 deletions
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28
src/core/obj.js
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@ -1497,29 +1497,23 @@ var XRef = (function XRefClosure() {
return xrefEntry;
},
fetchIfRefAsync: function XRef_fetchIfRefAsync(obj, suppressEncryption) {
async fetchIfRefAsync(obj, suppressEncryption) {
if (!isRef(obj)) {
return Promise.resolve(obj);
return obj;
}
return this.fetchAsync(obj, suppressEncryption);
},
fetchAsync: function XRef_fetchAsync(ref, suppressEncryption) {
var streamManager = this.stream.manager;
var xref = this;
return new Promise(function tryFetch(resolve, reject) {
try {
resolve(xref.fetch(ref, suppressEncryption));
} catch (e) {
if (e instanceof MissingDataException) {
streamManager.requestRange(e.begin, e.end).then(function () {
tryFetch(resolve, reject);
}, reject);
return;
}
reject(e);
async fetchAsync(ref, suppressEncryption) {
try {
return this.fetch(ref, suppressEncryption);
} catch (ex) {
if (!(ex instanceof MissingDataException)) {
throw ex;
}
});
await this.pdfManager.requestRange(ex.begin, ex.end);
return this.fetchAsync(ref, suppressEncryption);
}
},
getCatalogObj: function XRef_getCatalogObj() {