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refactor(compiler): pipeline phase to lift element attributes into const arrays (#48580)

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This commit serializes the attributes on element-like structures in the template
and converts them to constant arrays, which it lifts into the `consts` array for
the entire component compilation.

PR Close #48580
This commit is contained in:
Alex Rickabaugh 2022-12-22 11:57:20 -05:00 committed by Andrew Kushnir
parent deae02ecef
commit 64df0efcca
1 changed files with 62 additions and 0 deletions
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packages/compiler/src/template/pipeline/src/phases/const_collection.ts Normal file
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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import * as core from '../../../../core';
import * as o from '../../../../output/output_ast';
import * as ir from '../../ir';
import {ElementAttributes} from '../../ir/src/element';
import {ComponentCompilation} from '../compilation';
/**
* Converts the semantic attributes of element-like operations (elements, templates) into constant
* array expressions, and lifts them into the overall component `consts`.
*/
export function phaseConstCollection(cpl: ComponentCompilation): void {
for (const [_, view] of cpl.views) {
for (const op of view.create) {
if (op.kind !== ir.OpKind.ElementStart && op.kind !== ir.OpKind.Element &&
op.kind !== ir.OpKind.Template) {
continue;
} else if (!(op.attributes instanceof ElementAttributes)) {
continue;
}
const attrArray = serializeAttributes(op.attributes);
if (attrArray.entries.length > 0) {
op.attributes = cpl.addConst(attrArray);
} else {
op.attributes = null;
}
}
}
}
function serializeAttributes({attributes, bindings, classes, i18n, projectAs, styles, template}:
ElementAttributes): o.LiteralArrayExpr {
const attrArray = [...attributes];
if (projectAs !== null) {
attrArray.push(o.literal(core.AttributeMarker.ProjectAs), o.literal(projectAs));
}
if (classes.length > 0) {
attrArray.push(o.literal(core.AttributeMarker.Classes), ...classes);
}
if (styles.length > 0) {
attrArray.push(o.literal(core.AttributeMarker.Styles), ...styles);
}
if (bindings.length > 0) {
attrArray.push(o.literal(core.AttributeMarker.Bindings), ...bindings);
}
if (template.length > 0) {
attrArray.push(o.literal(core.AttributeMarker.Template), ...template);
}
if (i18n.length > 0) {
attrArray.push(o.literal(core.AttributeMarker.I18n), ...i18n);
}
return o.literalArr(attrArray);
}