extension.js

const vscode = require('vscode')

const numRE = /\s*[$¢€¥£]?\s*([+-]?[0-9]*[.]?[0-9]*)/

/**
 * @param {vscode.ExtensionContext} context
 */
function activate(context) {

	const disposable = vscode.commands.registerCommand('sumnumbers.sumNumbers', function () {
		const editor = vscode.window.activeTextEditor

		if (!editor) {
			return
		}
		const document = editor.document
		const selection = editor.selection

		// set lastLineNum to the line number after selection end,
		// regardless of whether the selection ends within a line
		var lastLineNum = editor.selection.end.line
		if (editor.selection.end.character > 0) {
			lastLineNum++
		}

		const numArray = []
		var sum = 0
		for (var lineNum = selection.start.line; lineNum < lastLineNum; ++lineNum) {
			const line = document.lineAt(lineNum)
			const numMatchArr = line.text.match(numRE)
			if ((numMatchArr == null) || (numMatchArr.length < 2)) {
				continue
			}
			const value = parseFloat(numMatchArr[1])
			if (isNaN(value)) {
				continue
			}
			numArray.push(value)
			sum += value
		}

		const result = "\nsum = " + sum + " of " + numArray.length + " numbers: " + numArray.join(", ") + "\n"
		const nextLinePosition = new vscode.Position(lastLineNum, 0)
		editor.edit(editBuilder => {
			editBuilder.insert(nextLinePosition, result)
		})
	})

	context.subscriptions.push(disposable)
}

module.exports = {
	activate
}