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