@angular/core
Version:
Angular - the core framework
47 lines • 6.61 kB
JavaScript
/**
* @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 { concatStringsWithSpace } from '../../util/stringify';
import { assertFirstCreatePass } from '../assert';
import { getTView } from '../state';
/**
* Compute the static styling (class/style) from `TAttributes`.
*
* This function should be called during `firstCreatePass` only.
*
* @param tNode The `TNode` into which the styling information should be loaded.
* @param attrs `TAttributes` containing the styling information.
* @param writeToHost Where should the resulting static styles be written?
* - `false` Write to `TNode.stylesWithoutHost` / `TNode.classesWithoutHost`
* - `true` Write to `TNode.styles` / `TNode.classes`
*/
export function computeStaticStyling(tNode, attrs, writeToHost) {
ngDevMode &&
assertFirstCreatePass(getTView(), 'Expecting to be called in first template pass only');
let styles = writeToHost ? tNode.styles : null;
let classes = writeToHost ? tNode.classes : null;
let mode = 0;
if (attrs !== null) {
for (let i = 0; i < attrs.length; i++) {
const value = attrs[i];
if (typeof value === 'number') {
mode = value;
}
else if (mode == 1 /* AttributeMarker.Classes */) {
classes = concatStringsWithSpace(classes, value);
}
else if (mode == 2 /* AttributeMarker.Styles */) {
const style = value;
const styleValue = attrs[++i];
styles = concatStringsWithSpace(styles, style + ': ' + styleValue + ';');
}
}
}
writeToHost ? tNode.styles = styles : tNode.stylesWithoutHost = styles;
writeToHost ? tNode.classes = classes : tNode.classesWithoutHost = classes;
}
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