Emmet cannot evaluate math expressions on the first line

[alextegelid]

Issue Type: Bug

Steps to reproduce

1. Open a new editor
2. Type a simple expression (in my case 160*4)
3. Hit Cmd+Shift+Y (or select Evaluate math expression from the command palette)

Expected result
The expression being exchanged for the correct answer (640 in my case).

Actual result
An error notification saying Could not evaluate expression.

Note
Adding a new line above the expression solves the issue.

---

VS Code version: Code 1.21.1 (79b44aa, 2018-03-14T14:39:09.335Z)
OS version: Darwin x64 16.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-5287U CPU @ 2.90GHz (4 x 2900)
Load (avg)	3, 3, 2
Memory (System)	8.00GB (0.06GB free)
Process Argv	/Applications/Visual Studio Code.app/Contents/MacOS/Electron
Screen Reader	no
VM	0%

Extensions (39)

Extension	Author (truncated)	Version
clipboard-history	Anj	1.0.7
insertnumbers	Asu	0.9.1
vsc-material-theme	Equ	1.5.1
todo-tree	Gru	0.0.30
indenticator	Sir	0.5.0
vscode-wakatime	Wak	1.1.24
Bookmarks	ale	0.18.2
ACF-Snippet	ant	1.8.3
git-easy	bib	1.9.1
path-intellisense	chr	1.4.2
laravel-blade	cjh	1.1.2
woocommerce	cla	1.0.0
wpcs-whitelist-flags	cla	1.0.0
vscode-eslint	dba	1.4.7
vscode-dash	dee	1.8.0
githistory	don	0.4.0
jquerysnippets	don	0.0.1
gitlens	eam	8.1.1
php-debug	fel	1.12.2
php-intellisense	fel	2.2.9
php-pack	fel	1.0.1
auto-rename-tag	for	0.0.15
canvas-snippets	hol	0.3.2
rest-client	hum	0.17.0
vscode-random	jre	1.3.2
vs-color-picker	lih	0.7.0
ftp-sync	luk	0.3.3
dotenv	mik	1.0.1
vscode-apache	mrm	1.1.1
vscode-scss	mrm	0.6.2
cpptools	ms-	0.15.0
php-docblocker	nei	1.3.3
advanced-new-file	pat	1.1.0
sass-indented	rob	1.4.8
incremental-search	sie	0.2.1
vscode-fileutils	sle	2.8.1
wordpress-snippet	tun	1.1.2
vscode-arduino	vsc	0.2.11
better-align	wwm	1.1.6

(3 theme extensions excluded)

Reproduces without extensions

[ramya-rao-a]

Thanks for reporting @alextegelid
PRs are welcome to fix this issue.
The place to start looking is https://github.com/Microsoft/vscode/blob/1.21.1/extensions/emmet/src/evaluateMathExpression.ts

[jeanp413]

Hi @ramya-rao-a , I'd like to take this up.

[ramya-rao-a]

Thanks @jeanp413!