src/vs/workbench/api/common/extHostDocumentData.ts/ExtHostDocumentLine/firstNonWhitespaceCharacterIndex
class ExtHostDocumentLine:	public get firstNonWhitespaceCharacterIndex(): number {
		//TODO@api, rename to 'leadingWhitespaceLength'
		return /^(\s*)/.exec(this._text)![1].length;
	}