Adds support for inheriting host directives from the parent class. This is consistent with how we inherit other features like host bindings.
Fixes#51203.
PR Close#52992
This is a follow-up to the fix from #52414. It adds a diagnostic that will tell users when a control flow is preventing its direct descendants from being projected into a specific component slot.
PR Close#52726
The `$first`, `$last`, `$even` and `$odd` variables in `@for` loops aren't defined on the template context of the loop, but are computed based on `$index` and `$count` (e.g. `$first` is defined as `$index === 0`). We do this calculation by looking up `$index` and `$count` when one of the variables is used.
The problem is that all `@for` loop variables are available implicitly which means that when a nested loop tries to rewrite a reference to an outer loop computed variable, it finds its own `$index` and `$count` first and it doesn't look up the ones on the parent at all. This means that the calculated values will be incorrect at runtime.
These changes work around the issue by defining nested-level-specific variable names that can be used for lookups (e.g. `$index` at level `2` will also be available as `ɵ$index_2`). This isn't the most elegant solution, however the `TemplatDefitinionBuilder` wasn't set up to handle shadowed variables like this and it doesn't make sense to refactor it given the upcoming template pipeline.
Fixes#52917.
PR Close#52931
Reworks the `repeater` instruction to go through `advance`, instead of passing in the index directly. This ensures that lifecycle hooks run at the right time and that we don't throw "changed after checked" errors when we shouldn't be.
Fixes#52885.
PR Close#52935
In some cases ICU expression placeholders may have trailing spaces that
need to be trimmed when matching the placeholder to its corresponding
text binding.
PR Close#52698
We were previously counting the i18n expression index and deciding when
to apply i18n expressions based on the i18n context. These should be
done based on the i18n block instead.
PR Close#52698
The previous commit added support for interpolated text in ICUs, but it
made the assumption that the interpolation would be a single variable
read expression.
To properly support all kinds of interpolation expressions, this commit
refactors how ICUs are ingested to allow us to re-use the same logic we
use for bound text outside of ICUs.
To accomplish this, the `IcuOp` creation op has been removed in favor of
a pair of ops: `IcuStartOp` and `IcuEndOp`, that mark the beginning and
end of the ICU. Now, instead of inserting an `IcuUpdateOp` in the update
IR, we call `ingestBoundText` and use the presence of the surrounding
`IcuStartOp` and `IcuEndOp` to match the interpolation with the ICU.
PR Close#52698
Previously ICUs were assumed to only generate a single i18n expression
per ICU. However, it is possible for ICUs to contain text interpolations
which requires additional expressions. This commit adds support for
multiple expressions per ICU.
PR Close#52698
ICUs that contain element tags need extra parameters for the i18n
message. These are in addition to the element slot params that are
already added to the parent i18n block's params. In this commit we add a
new phase to fill in these placeholders.
PR Close#52698
Previously the template pipeline sorted i18n message params before
adding the sub-message placeholders. Now its sorts after all
placeholders are added.
Both the template pipeline and TemplateDefinitionBuilder previously
failed to sort the post-processing params. They both now sort these as
well. This is safe to change in TemplateDefinitionBuilder, as it does
not change anything about the functionality, it simply ensures that
params map in the output has the keys ordered in a way that can be
easily reproduced in the template pipeline.
PR Close#52698
Fixes that all implicit variables in `@for` loops were inferred to be numbers, even though most are actually boolean.
Note that I also had to work around a weird TypeScript behavior in `tsDeclareVariable` where usually we declare variables in the following format:
```
var _t1: <type> = null!;
```
This works in most cases, but if the type is a `boolean`, TypeScript infers the variable as `never`, instead of `boolean`. I've worked around it by adding an `as boolean` to the initializer.
Fixes#52730.
PR Close#52732
Adds the private `_enableBlockSyntax` flag that can be used by the language service to disable blocks on apps that aren't on Angular v17.
PR Close#52683
Now that two-way bindings work correctly with implicit receivers, we can fix the corresponing source map tests. The main issue was that we were not properly mapping `elementEnd` for elements with no closing tag (self-closing elements).
PR Close#52479
Some two-way bindings tests were not working properly, because we could not ingest the implicit receiver required to write to the `ngModelChanges` property. Now, we properly resolve that implicit receiver to the root component context.
Also, add some tests, both for the simple case, and the case where the listener is inside a nested view.
PR Close#52479
Some `defer` blocks have external dependencies on other components or directives. These dependencies need to be extracted into deps functions, which either return local deps, or use a dynamic import for non-local deps. Template Pipeline can now generate these functions.
PR Close#52479
When an `ng-template` has local refs, such as `<ng-template #foo>`, we must emit a `ɵɵtemplateRefExtractor` argument to the template creation functino. The template pipeline now supports this.
PR Close#52479
`TemplateDefinitionBuilder` is somewhat unreliable about extracting constant attributes (e.g. `[attr.foo]="'one'"`). It never extracts const non-string expressions, and usually, but not always, extracts const string expressions. Template pipeline consistently extracts const strings, and we add new goldens for a couple such cases.
PR Close#52479
Some defer triggers, such as `hover`, expect a local reference as an argument. For example, `@defer (on hover(target))` waits until the user hovers over the target.
However, these defer conditions also have a nullary form, in which the trigger is implicitly the first element in the placeholder block. We now support that case in template pipeline.
PR Close#52479
We already supported `defer on` conditions, which become instructions in the create mode block.
Now, we also support `defer when` conditions, where are very similar, with the notable difference that they go in the update block (because a user-supplied condition must be re-evaluated on each update.)
PR Close#52479
Previously we supported ICUs where the ICU itself represetned the entire
translated message. This change allows ICUs to act as a sub-message
inside other translated messages.
PR Close#52503
Discovered this while validating #52414 against Angular Material. We were projecting `<ng-template>` nodes at the root of `@if` and `@for` with the `ng-template` tag name which enables directive matching and applies the directive to the control flow node.
These changes fix the issue by never passing along the `ng-template` tag name.
PR Close#52515
TypeScript JsDoc parsing, by default, treats occurences of Angular decorators (e.g. `@Component`) in JsDoc comments as JsDoc tags. This commit escapes these decorator strings by copying the raw JS doc onto a dummy symbol in a new SourceFile to make TypeScript re-parse the comment.
PR Close#52481
With the directive-based control flow users were able to conditionally project content using the `*` syntax. E.g. `<div *ngIf="expr" projectMe></div>` will be projected into `<ng-content select="[projectMe]"/>`, because the attributes and tag name from the `div` are copied to the template via the template creation instruction. With `@if` and `@for` that is not the case, because the conditional is placed *around* elements, rather than *on* them. The result is that content projection won't work in the same way if a user converts from `*ngIf` to `@if`.
These changes aim to cover the most common case by doing the same copying when a control flow node has *one and only one* root element or template node.
This approach comes with some caveats:
1. As soon as any other node is added to the root, the copying behavior won't work anymore. A diagnostic will be added to flag cases like this and to explain how to work around it.
2. If `preserveWhitespaces` is enabled, it's very likely that indentation will break this workaround, because it'll include an additional text node as the first child. We can work around it here, but in a discussion it was decided not to, because the user explicitly opted into preserving the whitespace and we would have to drop it from the generated code. The diagnostic mentioned point #1 will flag such cases to users.
Fixes#52277.
PR Close#52414
Prior to this change, the transform function would be referenced with a potentially
relative import into an external declaration file. Such imports are not portable
and should not be created in this context. This commit addresses the issue by threading
though the originally used module specifier by means of the `Reference` type.
Fixes#52324
PR Close#52437
This commit fixes an issue where using literal types in the arguments of an input coercion
function could result in emitting invalid output, due to an assumption that TypeScript makes
when emitting literal types. Specifically, it takes the literal's text from its containing
source file, but this breaks when the literal type node has been transplanted into a
different source file. This issue has surfaced in the type-check code generator and is
already being addressed there, so this commit moves the relevant `TypeEmitter` class
from the `typecheck` module to the `translator` module, such that it can be reused for
emitting types in the type translator.
Fixes#51672
PR Close#52437
The previous commits provided the scaffolding for `defer on`. In this commit, we build on that work, adding triggers for `immediate`, `timer`, `hover`, and `viewport`.
PR Close#52387
Previously, we supported a `HasConst` trait, allowing an op to be const collected automatically. However, that approach had the shortcoming that each op could only collect a single constant.
Instead, we now provide a `ConstCollectedExpr`, which collects constants at the expression level, allowing ops to have multiple collectible consts.
Then, we use this new abstraction to support the `defer on` conditions.
PR Close#52387
Previously, we had an "empty shell" implementation of defer conditions, and we used separate ops to represent secondary defer blocks.
Now, we have a real scaffolding for supporting the various defer conditions, and the secondary defer block information has been refactored onto the main defer op.
Additionally, to enable this, we refactor the way that using slot indices works. Instead of having a trait that causes users of slot indices to be linked to the allocated slot, we share a single `SlotHandle` object by reference. This allows an op to use slot information for more than one Xref at a time, and eliminates a layer of indirection.
Co-authored-by: Alex Rickabaugh <alxhub@users.noreply.github.com>
PR Close#52387
Enables a handful of i18n tests that are currently skipped, but pass if
enabled. Some of them require alternate golden files because of
inconsequential differences in the cost array order.
PR Close#52390
This commit expands docs extraction for classes and interfaces to include inherited members. This relies on the type checker to get the _resolved_ members of the type so that the extractor doesn't need to reason about inheritance rules, which can get tricky (especially with regards to method overloads).
PR Close#52389
This commit adds decorators to the extracted API docs. It makes some
very hard-coded assumptions about the pattern used to declare decorators
that's extremely specific to what the framework does today.
PR Close#52389
Previously, we would emit *two* pipe creation instructions for each pipe in a switch case. This is because we were visiting both the transformed and raw versions of the pipe bindings.
Now, we clear the raw case expressions array after generating the transformed test expression.
Also, we introduce some new goldens, because our pipe creation order is harmlessly different.
PR Close#52289
We roughly attempt to match TemplateDefinitionBuilder's pipe creation order, by placing pipe creation instructions after their target elements. However, we cannot fully emulate the "inside-out" ordering TemplateDefinitionBuilder uses when multiple pipes apply to one element, because TemplateDefinitionBuilder creates the pipes as expressions are visited, from the leaves up. Our order is perfectly adequate though.
We also add a non-compatibility-mode ordering, which just appends them to the end of the create block. This is better because it allows for more chaining opportunities.
PR Close#52289
Singleton property interpolation instructions consume only one variable, but are still emitted as an interpolation instruction (they cannot be collapsed because `propertyInterpolate` implicitly stringifies its argument.)
PR Close#52289
We were incorrectly emiting a extracted constant pool index for the final argument of the projection instruction. It actually takes an array literal.
(N.B.: This means we re-create the array every time! We should probably modify the runtime to use a const index for this.)
Additionally, we alter the projection op to not extend the element op base type.
PR Close#52289
The correct order of attributes and properties is:
1. Interpolated properties
2. Interpolated attributes
3. Non-interpolated properties
4. Non-interpolated attributes
This includes an additional nuance: singleton attribute interpolations, such as `[attr.foo]="{{bar}}"`, will be "collaped" into a simple `attribute` instruction. However, this is *not* the case for singleton property interpolations! The ordering phase must take this nuance into account to match the TemplateDefinitionBuilder order.
After the project lands, it might be nice to also collapse singleton property interpolations.
PR Close#52289
Previously, we ran the ordering phase near the end of the compilation. However, this meant that phases like slot assignment and variable offset assignment would happen first, and then the nice, monotonically-increasing orders would be scrambled by the reordering.
It's much more intelligible to order first, and then perform these assignments. However, to make this happen, some modifications to the ordering phase are required. In particular, we can no longer rely on `advance` instructions to break up orderable groups.
PR Close#52289
Many instructions consume variable slots, which are used to persist data between update runs. For top-level instructions, the offset into the variable data array is implicitly advanced, because those instructions always run.
However, instructions in non-top-level expressions cannot be assumed to run every time, because they might be conditionally executed. Therefore, they cannot implicitly advance the offset into the variable data, and must be given an explicitly assigned variable offset.
TemplateDefinitionBuilder assigned offsets top-to-bottom for all instructions *except* pure functions. Pure functions would be assigned offsets lazily, on a second pass.
Template Pipeline can now imitate this behavior, when in compatibility mode: pure functions are assigned offsets on a second pass.
This also makes the "variadic var offsets" phase unnecessary -- the new approach is more general and correct.
PR Close#52289
Previously, inside an event listener, template pipeline would always save the context from restoring a view, e.g.
```
const restored_ctx = r0.ɵɵrestoreView(s);
```
This is usually correct! However, consider the case of a listener in the template's root view. The appropriate context will already be available via closure capture, and we can just use it (as `ctx`).
Now, the context resolution phase understands that we don't need to use the restored view's saved context if we would have access to it by closure.
Note: we also create a new golden, because the const array is in a harmlessly different order.
PR Close#52289
Previously, the template pipeline did not handle "empty" reads gracefully: it would emit syntactically invalid reads of empty properties. Now we read `$implicit`.
This allows us to enable a test that relies on `$implicit`. However, we also have to create another golden, because our variable inlining is more aggressive.
PR Close#52289
We currently allow elements to be collapsed around pipe creation instructions. TemplateDefinitionBuilder disallows this, but only sometimes. Collapsing in this case is actually less generated code, and it's OK to allow it.
PR Close#52289
The template pipeline can now generate track functions, and extract them into the constant pool (or optimize them if needed). Additionally, context variables such as `$index` can be used inside track functions and for loop bodies.
PR Close#52001
