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There are many custom script/config formats in CatSystem2, and interestingly enough, they almost all run under the same basic set of rules. (even if many are ignored)

CatSystem2 makes use of a few different script formats, such as:

Format	Ext	Description
CST Scene	.cst	Story, dialog, scenes
FES Screen	.fes	Menus, windows, screens
ANM Animation	.anm	Frame-animations for [[HG-X Images
Definition File	.dfn	Config file for installers, and boot menu
Particle Script	.ppi	Particle effects
Motion Script	???	Motion/movement effects

Symbol	ID	Kind	Description
none	0x00	None	None, or maybe invalid result
#	0x01	Operator	Hashtag, CST variables and headers
$	0x02	Operator
$$	0x03	Operator	Escaped '$' ?
[ \t]	0x04	Whitespace	Whitespace
\n|\r\n?	0x05	Newline	Newline
\\	0x06	Operator	Single backslash
other	0x07	Other	No successful parse, possibly error
0[xX][0-9a-fA-F]+ [+\-]?\d+	0x?	Integer	Integer (unsigned hex) Integer (signed dec)
[+\-]?\d+(\.\d+[fF]?|[fF])	0x?	Float	Float
"([^\\]|\\")*"	0x?	String	String
'.{1,2}'	0x?	Character	Character (up to 0xffff) Uses Shift JIS rules
if	0x12	Keyword	If statement
else	0x13	Keyword	Else statement
while	0x14	Keyword	While loop
do	0x15	Keyword	Do (while) loop
for	0x16	Keyword	For loop
switch	0x17	Keyword	Switch statement
case	0x18	Keyword	Case label
range	0x19	Keyword	Range ? Possible usage in switch
default	0x1a	Keyword	Default label
goto	0x1b	Keyword	Goto statement
return	0x1c	Keyword	Return statement
break	0x1d	Keyword	Break statement
continue	0x1e	Keyword	Continue statement
	0x1f		???
struct	0x20	Keyword	Structure type definition
union	0x21	Keyword	Union type definition
enum	0x22	Keyword	Enum type definition
function	0x23	Keyword	Function type definition
global	0x24	Keyword	Global modifier
heap	0x25	Keyword	Heap modifier
	0x26		???
@	0x27	Keyword	Default argument
	0x28		???
void	0x29	Keyword	No type
char	0x2a	Keyword	Signed 8-bit integer ? Depends on shift JIS double byte characters
byte	0x2b	Keyword	Unsigned 8-bit integer type
short	0x2c	Keyword	Signed 16-bit integer type
word	0x2d	Keyword	Unsigned 16-bit integer
long	0x2e	Keyword	Signed 32-bit integer
dword	0x2f	Keyword	Unsigned 32-bit integer
float	0x30	Keyword	Single-precision floating type
!	0x80	Operator	Logical Not
!=	0x81	Operator	Not Equal to
%	0x?	Operator	Remainder, macros in FE Scripts
&	0x82	Operator	Bitwise AND
&&	0x83	Operator	Logical AND
(	0x?	Operator	Open parenthesis
)	0x?	Operator	Close parenthesis
*	0x?	Operator	Multiply
+	0x?	Operator	Add
++	0x?	Operator	Increment
-	0x?	Operator	Subtract
--	0x?	Operator	Decrement
->	0x?	Operator	Point to/Arrow
,	0x?	Operator	Comma separator
.	0x?	Operator	Dot
...	0x?	Operator	Ellipsis
:	0x?	Operator	Colon
;	0x?	Operator	Semicolon
<	0x?	Operator	Less than
<=	0x?	Operator	Less or Equal
<<	0x?	Operator	Bitwise Left shift
[	0x?	Operator	Open bracket
]	0x?	Operator	Close bracket
=	0x?	Operator	Assignment
+=	0x?	Operator	Add assignment
-=	0x?	Operator	Subtract assignment
*=	0x?	Operator	Multiply assignment
/=	0x?	Operator	Divide assignment
%=	0x?	Operator	Remainder assignment
==	0x?	Operator	Equal to
&=	0x?	Operator	Bitwise AND assignment
`	=`	0x?	Operator
^=	0x?	Operator	Bitwise XOR assignment
<<=	0x?	Operator	Bitwise Left shift assignment
>>=	0x?	Operator	Bitwise Right shift assignment
>	0x?	Operator	Greater than
>=	0x?	Operator	Greater or Equal
>>	0x?	Operator	Bitwise Right shift
/	0x?	Operator	Divide
?	0x?	Operator	Unknown usage
^	0x?	Operator	Bitwise XOR
{	0x?	Operator	Open brace
`	`	0x?	Operator
}	0x?	Operator	Close brace
`		`	0x?
~	0xa?	Operator	Bitwise NOT (negate)
sizeof	0xb?	Sizeof	Measure size of structure ?
none	0xbd	ID only	End of Keyword Table