Spaces:
Sleeping
Sleeping
| // Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license. | |
| // See LICENSE in the project root for license information. | |
| import { DocParagraph, DocNodeKind, DocPlainText } from '../nodes'; | |
| /** | |
| * Implementation of DocNodeTransforms.trimSpacesInParagraphNodes() | |
| */ | |
| export class TrimSpacesTransform { | |
| static transform(docParagraph) { | |
| const transformedNodes = []; | |
| // Whether the next nonempty node to be added needs a space before it | |
| let pendingSpace = false; | |
| // The DocPlainText node that we're currently accumulating | |
| const accumulatedTextChunks = []; | |
| const accumulatedNodes = []; | |
| // We always trim leading whitespace for a paragraph. This flag gets set to true | |
| // as soon as nonempty content is encountered. | |
| let finishedSkippingLeadingSpaces = false; | |
| for (const node of docParagraph.nodes) { | |
| switch (node.kind) { | |
| case DocNodeKind.PlainText: | |
| const docPlainText = node; | |
| const text = docPlainText.text; | |
| const startedWithSpace = /^\s/.test(text); | |
| const endedWithSpace = /\s$/.test(text); | |
| const collapsedText = text.replace(/\s+/g, ' ').trim(); | |
| if (startedWithSpace && finishedSkippingLeadingSpaces) { | |
| pendingSpace = true; | |
| } | |
| if (collapsedText.length > 0) { | |
| if (pendingSpace) { | |
| accumulatedTextChunks.push(' '); | |
| pendingSpace = false; | |
| } | |
| accumulatedTextChunks.push(collapsedText); | |
| accumulatedNodes.push(node); | |
| finishedSkippingLeadingSpaces = true; | |
| } | |
| if (endedWithSpace && finishedSkippingLeadingSpaces) { | |
| pendingSpace = true; | |
| } | |
| break; | |
| case DocNodeKind.SoftBreak: | |
| if (finishedSkippingLeadingSpaces) { | |
| pendingSpace = true; | |
| } | |
| accumulatedNodes.push(node); | |
| break; | |
| default: | |
| if (pendingSpace) { | |
| accumulatedTextChunks.push(' '); | |
| pendingSpace = false; | |
| } | |
| // Push the accumulated text | |
| if (accumulatedTextChunks.length > 0) { | |
| // TODO: We should probably track the accumulatedNodes somehow, e.g. so we can map them back to the | |
| // original excerpts. But we need a developer scenario before we can design this API. | |
| transformedNodes.push(new DocPlainText({ | |
| configuration: docParagraph.configuration, | |
| text: accumulatedTextChunks.join('') | |
| })); | |
| accumulatedTextChunks.length = 0; | |
| accumulatedNodes.length = 0; | |
| } | |
| transformedNodes.push(node); | |
| finishedSkippingLeadingSpaces = true; | |
| } | |
| } | |
| // Push the accumulated text | |
| if (accumulatedTextChunks.length > 0) { | |
| transformedNodes.push(new DocPlainText({ | |
| configuration: docParagraph.configuration, | |
| text: accumulatedTextChunks.join('') | |
| })); | |
| accumulatedTextChunks.length = 0; | |
| accumulatedNodes.length = 0; | |
| } | |
| const transformedParagraph = new DocParagraph({ | |
| configuration: docParagraph.configuration | |
| }); | |
| transformedParagraph.appendNodes(transformedNodes); | |
| return transformedParagraph; | |
| } | |
| } | |
| //# sourceMappingURL=TrimSpacesTransform.js.map |