Lexical Structure
Keywords
Keywords can only be used in their correct contextes, and cannot be used as names of variables, functions, data types, enums, generics, [labels][?] or namespaces.
The following are all of the keywords [name] implements:
-
if -
else -
switch -
case -
default -
loop -
while -
do -
for -
break -
continue -
return -
goto -
var -
const -
priv -
rdonly -
fun -
virt -
lambda -
type -
asm -
typeof -
sizeof -
instanceof -
new -
destroy -
namespace -
using -
try [reserved] -
catch [reserved] -
throw [reserved]
In addition to these, all the primitive data types, while not strictly keywords, are not allowed as identifiers.
Identifiers
Identifiers can be any sequence of alphanumeric characters and underscores. They cannot start with a number, but they can contain numbers and they can start with underscores. As mentioned above, keywords are not allowed as identifiers.
I have no clue about Unicode Standard Annex #31, so please don't go calling your variables 小红书, as the result is pretty much undefined. (Should work, though?)
Comments
Comments can either be line comments or block comments. After the sequence // all characters are ignored until newline (line comment), while after the sequence /* all characters are ignored until the sequence */. Do not forget to close your block comments! ;)
Whitespaces
[name] recognizes the following characters as whitespace:
-
Vertical tab
('\v') -
Horizontal tab
('\t') -
Form feed
('\f') -
Carriage return CR
('\r') -
Line feed LF
('\n') -
Space
(' ')
Escape sequences
This is a complete list of all escape sequences in [name]
-
\aAlert -
\bBackspace -
\fForm feed -
\nLine feed LF -
\rCarraige return CR -
\tHorizontal tab -
\vVertical tab -
\\Backslash -
\*Single quotation -
\"Double quotation mark -
\nnnASCII with octal value of nnn -
\xhhASCII with hex value of hh