With the changes in PR 13361, we're now using the `CanvasPattern.setTransform()` method when rendering certain Shadings/Patterns.
Note that while `CanvasPattern` itself has been supported since basically "forever", its `setTransform` method is a slightly newer addition to the specification; please refer to https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern#browser_compatibility
Rather than trying to re-write PR 13361 to not use, or possibly spending time/effort (if possible) polyfilling, `CanvasPattern.setTransform()` this patch thus suggests that we simply update the *minimum* supported browser versions instead.
According to the compatibility data linked above, the *minimum* supported browser versions in the PDF.js library are now as follows:
- Chrome >= 68, which was released on 2018-07-24.[1]
- Firefox ESR, see https://wiki.mozilla.org/Release_Management/Calendar.
- Safari >= 11.1, which was release on 2018-03-29.[2]
(Given that the PDF.js contributors cannot realistically test a bunch of old browsers, it's not unimaginable that some older browser versions are already not working with the PDF.js library.)
Based on these changes, which we should ensure are reflected in the Wiki as well, we can also remove a number of now redundant polyfills. Furthermore we'll no longer "claim" to support Windows XP, note the `gulpfile.js` changes, which should definitely *not* be an issue given that it's no longer officially supported.[3]
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[1] According to https://en.wikipedia.org/wiki/Google_Chrome_version_history
[2] According to https://en.wikipedia.org/wiki/Safari_version_history#Safari_11
[3] According to https://en.wikipedia.org/wiki/Windows_XP#End_of_support
With the changes made in the previous patch, we can now list "disableTelemetry" in the `AppOptions` only for the `CHROME`-builds and thus remove the special-casing in the `checkChromePreferencesFile` helper function.
Currently there's a lot of duplication in the `buildLib` and `buildDefaultPreferences` functions, which seem quite unfortunate. Hence this patch extracts the common functionality in a new `buildLibHelper` function instead.
Originally the default preferences where simply placed in a JSON-file, checked into the repository, which over time became impractical, annoying, and error-prone to maintain; please see PR 10548.
While that improved the overall situation a fair bit, it however inherited one quite unfortunate property of the old JSON-based solution[1]: It's still not possible for *different* build targets to specify their *own* default preference values.
With some preferences, such as e.g. `enableScripting`, it's not inconceivable that you'd want to (at least) support build-specific default preference values. Currently that's not really possible, which is why this PR re-factors the default preferences generation to support this.
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[1] This fact isn't really clear from the `AppOptions` implementation, unless you're familiar with the `gulpfile.js` code, which could lead to some confusion for those new to this part of the code-base.
A significant portion of the code-base has now been converted to use `let`/`const`, rather than `var`, hence it should be possible to simply enable the ESLint `no-var` rule globally.
This way we can ensure that new code won't accidentally use `var`, and it also removes the need to manually enable the rule in various folders.
Obviously it makes sense to continue the efforts to replace `var`, but that should probably happen on a file and/or folder basis.
Please note that this patch excludes the following code:
- The `extensions/` folder, since that seemed easiest for now (and I don't know exactly what the support situation is for the Chromium-extension).
- The entire `external/` folder is ignored, since most of it's currently excluded from linting.
For the code that isn't imported from elsewhere (and should be ignored), we should probably (at some point) bring the code up to the same linting/formatting standard as the rest of the code-base.
- Various files in the `test/` folder are ignored, as necessary, since the way that a lot of this code is loaded will require some care (or perhaps larger re-factoring) when removing `var` usage.
These tests, and their [accompanying Wiki page](https://github.com/mozilla/pdf.js/wiki/Required-Browser-Features), haven't received any real updates for *many years* and are sufficiently out of date to be effectively useless now.
Providing *irrelevant* compatibility information seems overall worse than not providing any information, and as suggested in the issue it'd probably be better to use https://github.com/mozilla/pdf.js#online-demo for checking if a particular platform/browser is supported.
Thanks to version control, it's easy to restore these files should the need ever arise. However, re-introducing these tests would essentially require updating every single test-case *and* a commitment to keeping them up to date with future code changes.
- the parser is base on a class extending XMLParserBase
- it handle xml namespaces:
* each namespace is assocated with a builder
* builder builds nodes belonging to the namespace
* when a node is inserted in the parent namespace compatibility is checked (if required)
- to avoid name collision between xml names and object properties, use Symbol.
Given that IE 11/Edge is now unsupported in PDF.js, and that Microsoft Edge is now a Chromium-browser, we can avoid (some) unnecessary bloat in the built CSS files.
Given how recently logical assignment operators support were added to browsers, we're intentionally translating them even in `SKIP_BABEL = true` builds for the time being.
However, in either `MOZCENTRAL` or `TESTING` builds it should be OK to simply leave logical assignment operators intact.
There's been a number of (somewhat) recent issues where people are having trouble using pdfjs-dist together with `webpack`, since that library purposely doesn't declare any dependencies; refer to PR 11474 for additional context.
In an *attempt*, although I don't know how much this will actually help in practice (given my limited `webpack` experience), let's try to list `worker-loader` as a *peer*-dependency to see if that helps. This should, unless I'm completely misunderstanding https://docs.npmjs.com/cli/v6/configuring-npm/package-json#peerdependencies, prevent `worker-loader` from being installed by default for *all* pdfjs-dist users while still indicating the dependency for those who need it.
The `gulp components` task is only necessary when running the reference-tests, since they use the `SimpleLinkService` during the `annotationLayer` sub-tests.
However, unit-tests don't actually use any part of the `gulp components` build, and we can thus reduce the overall runtime of the standalone unit-tests by not building unnecessary files.
There's no really compelling reason, as far as I can tell, to introduce the `ENABLE_SCRIPTING` build-target, instead of simply re-using the existing `TESTING` build-target for the new `gulp integrationtest` task.
In general there should be no problem with just always enable scripting in TESTING-builds, and if I were to *guess* the reason that this didn't seem to work was most likely because the Preferences ended up over-writing the `AppOptions`.
As it turns out the GENERIC-viewer has already has built-in support for disabling of Preferences, via the `AppOptions`, and this can be utilized in TESTING-builds as well to ensure that whatever `AppOptions` are set they're always respected.
* move set/clear|Timeout/Interval and crackURL code in pdf.js
* remove the "backdoor" in the proxy (used to dispatch event) and so return the dispatch function in the initializer
* remove listeners if an error occured during sandbox initialization
* add support for alert and prompt in the sandbox
* add a function to eval in the global scope
Currently only the `gulp unittest` task actually set the time-zone, which means that locally I'm now getting failures with e.g. `gulp test`.
*Please note:* I firmly believe that the unit-tests in question should be re-written, since even with this patch applied there's failures when running http://localhost:8888/test/unit/unit_test.html directly in a browser.
Compared to the, previously removed, `sandbox`/`watch-sandbox` gulp-tasks, these ones should work even when run against an non-existent/empty `build`-folder.
Also, to ensure that the development viewer actually works out-of-the-box, `gulp server` will now also include `gulp watch-dev-sandbox` to remove the need to *manually* invoke the build-tasks.
Finally, this patch also removes the `web/devcom.js` file since it shouldn't actually be needed, assuming that the "sandbox"-loading code in the `web/genericcom.js` file is actually *correctly* implemented.
The way that the `pdf.sandbox.js` building was implemented feels all kinds of inconsistent/wrong, and it "sticks out" quite a bit when compared to the rest of the `gulpfile.js`. This patch thus attempts to improve the current situation slightly, to hopefully make future maintenance easier.
One thing that strikes you, pretty immediately, when looking at PR 12604 is that the two new `gulp`-tasks added (i.e. `sandbox` and `watch-sandbox`) don't even work!?
The reason for this is that they implicitly dependent upon the result of the `buildnumber`-task, which isn't listed as a dependency. (Try running `gulp clean` *first*, and invoking any of the new `gulp`-tasks will inevitably fail.)
Furthermore, there's another (potentially big) problem with the implementation of e.g. the `gulp sandbox` task, since it doesn't actually wait for all building to complete before the task is considered as "done". This has the potential to cause all sorts of subtle bugs elsewhere, and the fact that things even "work" as-is can probably be attributed mostly to luck.
Unfortunately there's no *perfect* way to improve things here, since the `pdf.sandbox.js` file depends on including the `pdf.scripting.js` file as a string, however I firmly believe that improvements are still possible here.
To that end, this patch updates all relevant build-targets to create a *temporary* `pdf.scripting.js` file as part of the setup in the `gulp`-tasks, and then reads that file during the `pdf.sandbox.js` building.
This at least allows us to bring all of this "sandbox"-build code much more in-line with the existing build-system.
Given the somewhat "specialized" nature of the `pdf.sandbox.js` building, it ought to be possible to re-factor how some of the options are handled.
Note in particular that the `gulp-strip-comments` dependency seems somewhat unncessary, since the *main* source of comments are just the default license header. Hence I seems much more reasonable to simply not include that to begin with, rather than removing it after the fact (the few remaining Webpack-related should be few/small enough to not really matter much in practice).
This way we're able to further reduce the special-casing related to the `pdf.sandbox.js`-building, which will make future changes/maintenance easier by bringing this code more in-line with existing patterns in `gulpfile.js`.
(If we really want to reduce the filesize, we might want to consider always minifying the `GENERIC`-build of the `pdf.sandbox.js` file.)
There's no good reason, as far as I can tell, to use search-and-replace to include the *stringified* `pdf.scripting.js` file in the built `pdf.sandbox.js` file. Instead we could, and even should, utilize the existing `PDFJSDev.eval(...)`-functionality, which is not only simpler but will also be more efficient as well (no need for a regular expression).
The current location feels somewhat strange, and also inconsistent with the existing way that bundling is done.
Finally, add the version/build numbers at the top of the *built* `pdf.sandbox.js` files, since all other built files include that information given that it's often helpful to be able to easily determine the *exact* version.
* quickjs-eval.js has been generated using https://github.com/mozilla/pdf.js.quickjs/
* lazy load of sandbox code
* Rewrite tests to use the sandbox
* Add a task `watch-sandbox` which update bundle pdf.sandbox.js on change in the sandbox code
- Add support for logical assignment operators, i.e. `&&=`, `||=`, and `??=`, with a Babel-plugin. Given that these required incrementing the ECMAScript version in the ESLint and Acorn configurations, and that platform/browser support is still fairly limited, always transpiling them seems appropriate for now.
- Cache the `hasJSActions` promise in the API, similar to the existing `getAnnotations` caching. With this implemented, the lookup should now be cheap enough that it can be called unconditionally in the viewer.
- Slightly improve cleanup of resources when destroying the `WorkerTransport`.
- Remove the `annotationStorage`-property from the `PDFPageView` constructor, since it's not necessary and also brings it more inline with the `BaseViewer`.
- Update the `BaseViewer.createAnnotationLayerBuilder` method to actaually agree with the `IPDFAnnotationLayerFactory` interface.[1]
- Slightly tweak a couple of JSDoc comments.
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[1] We probably ought to re-factor both the `IPDFTextLayerFactory` and `IPDFAnnotationLayerFactory` interfaces to take parameter objects instead, since especially the `IPDFAnnotationLayerFactory` one is becoming quite unwieldy. Given that that would likely be a breaking change for any custom viewer-components implementation, this probably requires careful deprecation.
Note that a number of these cases are covered by existing unit-tests, and a few others only matter for the development/build scripts.
Furthermore, I've also tried to the best of my ability to test each case *manually* to hopefully further reduce the likelihood of this patch introducing any bugs.
Please find additional details about the ESLint rule at https://eslint.org/docs/rules/no-useless-escape
This brings the new `pdf.scripting.js` bundling more in-line with the pre-existing handling for the `pdf.js`/`pdf.worker.js` files:
- Add a new `src/pdf.scripting.js` file as the entry-point for the build scripts.
- Add the version/build numbers at the top of the *built* `pdf.scripting.js` files, since all other built files include that information given that it's often helpful to be able to easily determine the *exact* version.
- Tweak the `createScriptingBundle` in the gulp-file, since it looks like a little bit too much copy-and-paste in the variable names.
The only noticeable changes are that the built files are now *slightly* smaller, and that Webpack now supports optional chaining and nullish coalescing without the need for Babel plugins.
This dependency hasn't been updated in two years and the only place that
uses it is the `externaltest` target in the Gulpfile. We can simply
replace `fancy-log` usage there with `console.log` like we do in all
other places in the Gulpfile because we're not interested in the
timestamps here. Gulp already prints timestamps and these tests finish
within a second anyway.
Note that it remains in `package-lock.json` because other Gulp-related
packages have it as a dependency, but at least we're no longer depending
on it directly anymore now.
For now we need to use a Babel-plugin, since part of our build system doesn't support this fully (e.g. Babel-loader, Webpack 4.x, and SystemJS).
While the `?.` operator will thus always be transpiled by Babel, even in modern builds, simply supporting it for development purposes seems like a step in the right direction.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining
This is *similar* to the existing linting for JavaScript files, but covers CSS files instead.
While there's a lot of rules that could potentially be used, the main advantage of using Stylelint is that it has Prettier integration which means that we can automatically enforce a *consistent* style for our CSS files as well.
As a proof of concept, this patch is purposely limited to:
- Adding a simple rule, here `block-no-empty` is chosen; see https://stylelint.io/user-guide/rules/block-no-empty
- Adding Prettier integration, to unify the style of our CSS files.
Please find additional information at https://stylelint.io/
Note that this will increase the run-time of `gulp dist` and `gulp dist-install`, but that's unavoidable given that there's now additional building happening.
While this will obviously increase the size of the output of `gulp minified`/`gulp minified-es5` *slightly*, the resulting files are still a lot smaller than the non-minified builds.
See https://github.com/terser/terser#minify-options for information about various Terser options.
