Spaces:
Sleeping
Sleeping
File size: 3,945 Bytes
6abff73 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | // 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 |