monaco-editor
Version:
A browser based code editor
82 lines (81 loc) • 3.3 kB
JavaScript
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as strings from '../../../base/common/strings.js';
import { EditOperation } from '../core/editOperation.js';
import { Range } from '../core/range.js';
export class TrimTrailingWhitespaceCommand {
constructor(selection, cursors) {
this._selection = selection;
this._cursors = cursors;
this._selectionId = null;
}
getEditOperations(model, builder) {
const ops = trimTrailingWhitespace(model, this._cursors);
for (let i = 0, len = ops.length; i < len; i++) {
const op = ops[i];
builder.addEditOperation(op.range, op.text);
}
this._selectionId = builder.trackSelection(this._selection);
}
computeCursorState(model, helper) {
return helper.getTrackedSelection(this._selectionId);
}
}
/**
* Generate commands for trimming trailing whitespace on a model and ignore lines on which cursors are sitting.
*/
export function trimTrailingWhitespace(model, cursors) {
// Sort cursors ascending
cursors.sort((a, b) => {
if (a.lineNumber === b.lineNumber) {
return a.column - b.column;
}
return a.lineNumber - b.lineNumber;
});
// Reduce multiple cursors on the same line and only keep the last one on the line
for (let i = cursors.length - 2; i >= 0; i--) {
if (cursors[i].lineNumber === cursors[i + 1].lineNumber) {
// Remove cursor at `i`
cursors.splice(i, 1);
}
}
const r = [];
let rLen = 0;
let cursorIndex = 0;
const cursorLen = cursors.length;
for (let lineNumber = 1, lineCount = model.getLineCount(); lineNumber <= lineCount; lineNumber++) {
const lineContent = model.getLineContent(lineNumber);
const maxLineColumn = lineContent.length + 1;
let minEditColumn = 0;
if (cursorIndex < cursorLen && cursors[cursorIndex].lineNumber === lineNumber) {
minEditColumn = cursors[cursorIndex].column;
cursorIndex++;
if (minEditColumn === maxLineColumn) {
// The cursor is at the end of the line => no edits for sure on this line
continue;
}
}
if (lineContent.length === 0) {
continue;
}
const lastNonWhitespaceIndex = strings.lastNonWhitespaceIndex(lineContent);
let fromColumn = 0;
if (lastNonWhitespaceIndex === -1) {
// Entire line is whitespace
fromColumn = 1;
}
else if (lastNonWhitespaceIndex !== lineContent.length - 1) {
// There is trailing whitespace
fromColumn = lastNonWhitespaceIndex + 2;
}
else {
// There is no trailing whitespace
continue;
}
fromColumn = Math.max(minEditColumn, fromColumn);
r[rLen++] = EditOperation.delete(new Range(lineNumber, fromColumn, lineNumber, maxLineColumn));
}
return r;
}