87 lines
3.9 KiB
JavaScript
87 lines
3.9 KiB
JavaScript
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import { DocParagraph, DocNodeKind, DocPlainText } from '../nodes';
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/**
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* Implementation of DocNodeTransforms.trimSpacesInParagraphNodes()
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*/
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var TrimSpacesTransform = /** @class */ (function () {
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function TrimSpacesTransform() {
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}
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TrimSpacesTransform.transform = function (docParagraph) {
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var transformedNodes = [];
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// Whether the next nonempty node to be added needs a space before it
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var pendingSpace = false;
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// The DocPlainText node that we're currently accumulating
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var accumulatedTextChunks = [];
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var accumulatedNodes = [];
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// We always trim leading whitespace for a paragraph. This flag gets set to true
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// as soon as nonempty content is encountered.
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var finishedSkippingLeadingSpaces = false;
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for (var _i = 0, _a = docParagraph.nodes; _i < _a.length; _i++) {
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var node = _a[_i];
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switch (node.kind) {
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case DocNodeKind.PlainText:
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var docPlainText = node;
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var text = docPlainText.text;
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var startedWithSpace = /^\s/.test(text);
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var endedWithSpace = /\s$/.test(text);
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var collapsedText = text.replace(/\s+/g, ' ').trim();
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if (startedWithSpace && finishedSkippingLeadingSpaces) {
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pendingSpace = true;
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}
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if (collapsedText.length > 0) {
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if (pendingSpace) {
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accumulatedTextChunks.push(' ');
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pendingSpace = false;
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}
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accumulatedTextChunks.push(collapsedText);
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accumulatedNodes.push(node);
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finishedSkippingLeadingSpaces = true;
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}
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if (endedWithSpace && finishedSkippingLeadingSpaces) {
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pendingSpace = true;
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}
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break;
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case DocNodeKind.SoftBreak:
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if (finishedSkippingLeadingSpaces) {
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pendingSpace = true;
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}
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accumulatedNodes.push(node);
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break;
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default:
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if (pendingSpace) {
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accumulatedTextChunks.push(' ');
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pendingSpace = false;
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}
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// Push the accumulated text
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if (accumulatedTextChunks.length > 0) {
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// TODO: We should probably track the accumulatedNodes somehow, e.g. so we can map them back to the
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// original excerpts. But we need a developer scenario before we can design this API.
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transformedNodes.push(new DocPlainText({
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configuration: docParagraph.configuration,
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text: accumulatedTextChunks.join('')
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}));
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accumulatedTextChunks.length = 0;
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accumulatedNodes.length = 0;
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}
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transformedNodes.push(node);
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finishedSkippingLeadingSpaces = true;
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}
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}
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// Push the accumulated text
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if (accumulatedTextChunks.length > 0) {
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transformedNodes.push(new DocPlainText({
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configuration: docParagraph.configuration,
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text: accumulatedTextChunks.join('')
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}));
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accumulatedTextChunks.length = 0;
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accumulatedNodes.length = 0;
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}
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var transformedParagraph = new DocParagraph({
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configuration: docParagraph.configuration
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});
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transformedParagraph.appendNodes(transformedNodes);
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return transformedParagraph;
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};
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return TrimSpacesTransform;
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}());
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export { TrimSpacesTransform };
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//# sourceMappingURL=TrimSpacesTransform.js.map
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