code-server-2/extensions/emmet/src/evaluateMathExpression.ts

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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
/* Based on @sergeche's work in his emmet plugin */
import * as vscode from 'vscode';
import evaluate from '@emmetio/math-expression';
import { DocumentStreamReader } from './bufferStream';
export function evaluateMathExpression() {
if (!vscode.window.activeTextEditor) {
vscode.window.showInformationMessage('No editor is active');
return;
}
const editor = vscode.window.activeTextEditor;
const stream = new DocumentStreamReader(editor.document);
editor.edit(editBuilder => {
editor.selections.forEach(selection => {
const pos = selection.isReversed ? selection.anchor : selection.active;
stream.pos = pos;
try {
const result = String(evaluate(stream, true));
editBuilder.replace(new vscode.Range(stream.pos, pos), result);
} catch (err) {
vscode.window.showErrorMessage('Could not evaluate expression');
// Ignore error since most likely its because of non-math expression
console.warn('Math evaluation error', err);
}
});
});
}