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[api-minor] Re-factor NullL10n and remove the hard-coded l10n strings (PR 17115 follow-up)

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*Please note:* These changes only affect the GENERIC build, since `NullL10n` is only a stub elsewhere (see PR 17135).

After the changes in PR 17115, which modernized and improved l10n-handling, the `NullL10n`-implementation is no longer a good fallback for the "proper" `L10n`-classes.
To improve this situation, especially for the *standalone* viewer-components, this patch makes the following changes:
 - Let the `NullL10n`-implementation extend an actual `L10n`-class, which is constant and lazily initialized, to ensure that it works *exactly* like the "proper" ones.

 - Automatically bundle the "en-US" l10n-strings in the build, via the pre-processor, such that we don't need to remember to manually update them.

 - Ensure that the *standalone* viewer-components register their DOM-elements for translation, similar to the default viewer, since this will allow future code improvements by using "data-l10n-id"/"data-l10n-args" in most (if not all) parts of the viewer.

 - Remove the `NullL10n` from the `AnnotationLayer`, to avoid affecting bundle size too much.
   For third-party users that access the `AnnotationLayer`, as exposed in the main PDF.js library, they'll now need to *manually* register it for translation. (However, the *standalone* viewer-components still works given the point above.)
This commit is contained in:
Jonas Jenwald 2023-10-19 22:12:46 +02:00
parent a4cd2ef1db
commit f07675a6a8
11 changed files with 72 additions and 125 deletions
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4
web/interfaces.js
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@ -192,12 +192,12 @@ class IL10n {
* Translates text identified by the key and adds/formats data using the args
* property bag. If the key was not found, translation falls back to the
* fallback text.
* @param {string} key
* @param {Array | string} ids
* @param {Object | null} [args]
* @param {string} [fallback]
* @returns {Promise<string>}
*/
async get(key, args = null, fallback) {}
async get(ids, args = null, fallback) {}
/**
* Translates HTML element.