rckrdmrd
97f407c661
- Prefijo v2: MCH - TRACEABILITY-MASTER.yml creado - Listo para integracion como submodulo Workspace: v2.0.0 | SIMCO: v4.0.0
106 lines
2.7 KiB
JavaScript
106 lines
2.7 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict-local
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* @format
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*/
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'use strict';
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import type {
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BackgroundRepeatKeyword,
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BackgroundRepeatValue,
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} from './StyleSheetTypes';
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function isBackgroundRepeatKeyword(
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value: string,
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): value is BackgroundRepeatKeyword {
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return (
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value === 'repeat' ||
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value === 'space' ||
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value === 'round' ||
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value === 'no-repeat'
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);
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}
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export default function processBackgroundRepeat(
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backgroundRepeat: ?($ReadOnlyArray<BackgroundRepeatValue> | string),
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): $ReadOnlyArray<BackgroundRepeatValue> {
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let result: $ReadOnlyArray<BackgroundRepeatValue> = [];
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if (backgroundRepeat == null) {
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return [];
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}
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if (Array.isArray(backgroundRepeat)) {
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return backgroundRepeat;
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}
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if (typeof backgroundRepeat === 'string') {
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result = parseBackgroundRepeatCSSString(
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backgroundRepeat.replace(/\n/g, ' '),
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);
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}
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return result;
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}
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// https://www.w3.org/TR/css-backgrounds-3/#typedef-repeat-style
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function parseBackgroundRepeatCSSString(
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backgroundRepeat: string,
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): $ReadOnlyArray<BackgroundRepeatValue> {
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const result: Array<BackgroundRepeatValue> = [];
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const bgRepeatArray = backgroundRepeat.split(',').map(s => s.trim());
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for (const bgRepeat of bgRepeatArray) {
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if (bgRepeat.length === 0) {
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return [];
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}
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const parts = bgRepeat.split(/\s+/).filter(p => p.length > 0);
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if (parts.length === 1) {
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const part1 = parts[0];
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if (part1 == null) {
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return [];
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}
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const token1 = part1.toLowerCase();
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if (token1 === 'repeat-x') {
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result.push({x: 'repeat', y: 'no-repeat'});
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} else if (token1 === 'repeat-y') {
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result.push({x: 'no-repeat', y: 'repeat'});
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} else if (token1 === 'repeat') {
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result.push({x: 'repeat', y: 'repeat'});
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} else if (token1 === 'space') {
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result.push({x: 'space', y: 'space'});
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} else if (token1 === 'round') {
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result.push({x: 'round', y: 'round'});
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} else if (token1 === 'no-repeat') {
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result.push({x: 'no-repeat', y: 'no-repeat'});
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} else {
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return [];
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}
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} else if (parts.length === 2) {
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const part1 = parts[0];
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const part2 = parts[1];
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if (part1 == null || part2 == null) {
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return [];
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}
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const token1 = part1.toLowerCase();
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const token2 = part2.toLowerCase();
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if (
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isBackgroundRepeatKeyword(token1) &&
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isBackgroundRepeatKeyword(token2)
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) {
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result.push({x: token1, y: token2});
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} else {
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return [];
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}
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}
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}
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return result;
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}
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