NXSL Formal Grammar

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script ::=
	module |
	expression

module ::=
	module_component { module_component }

module_component ::=
	function |
	statement_or_block |
	use_statement

use_statement ::=
	use any_identifier ";"

any_identifier ::=
	IDENTIFIER |
	COMPOUND_IDENTFIER

function ::=
	sub IDENTIFIER "(" [ identifier_list ] ")" block

identifier_list ::=
	IDENTIFIER { "," IDENTIFIER }

block ::=
	"{" { statement_or_block } "}"

statement_or_block ::=
	statement |
	block

statement ::=
	expression ";" |
	builtin_statement |
	";"

builtin_statement ::=
	simple_statement ";" |
	if_statement |
	do_statement |
	while_statement |
	for_statement |
	foreach_statement |
	switch_statement |
	array_statement |
	global_statement |
	break ";"
	continue ";"

simple_statement ::=
	keyword [ expression ]

keyword ::=
	exit |
	print |
	println |
	return

if_statement ::=
	if "(" expression ")" statement_or_block [ else statement_or_block ]

for_statement ::=
	for "(" expression ";" expression ";" expression ")" statement_or_block

foreach_statement ::=
	foreach "(" IDENTIFIER ":" expression ")" statement_or_block

while_statement ::=
	while "(" expression ")" statement_or_block

do_statement ::=
	do statement_or_block while "(" expression ")" ";"

switch_statement ::=
	switch "(" expression ")" "{" case { case } [ default ] "}"

case ::=
	case constant ":" { statement_or_block }

default ::=
	default ":" { statement_or_block }

array_statement ::=
	[ global ] array identifier_list ";"

global_statement ::=
	global global_variable_declaration { "," global_variable_declaration } ";"

global_variable_declaration ::=
	IDENTIFIER [ "=" expression ]

expression ::=
	"(" expression ")" |
	IDENTIFIER "=" expression |
	expression "->" IDENTIFIER |
	"-" expression |
	"!" expression |
	"~" expression |
	inc IDENTIFIER |
	dec IDENTIFIER |
	IDENTIFIER inc |
	IDENTIFIER dec |
	expression "+" expression |
	expression "-" expression |
	expression "*" expression |
	expression "/" expression |
	expression "%" expression |
	expression like expression |
	expression ilike expression |
	expression "~=" expression |
	expression match expression |
	expression imatch expression |
	expression "==" expression |
	expression "!=" expression |
	expression "<" expression |
	expression "<=" expression |
	expression ">" expression |
	expression ">=" expression |
	expression "&" expression |
	expression "|" expression |
	expression "^" expression |
	expression "&&" expression |
	expression "||" expression |
	expression "<<" expression |
	expression ">>" expression |
	expression "." expression |
	expression "?" expression ":" expression |
	operand

operand ::=
	function_call |
	type_cast |
	constant |
	IDENTIFIER

type_cast ::=
	builtin_type "(" expression ")"

builtin_type ::=
	int32 |
	int64 |
	uint32 |
	uint64 |
	real |
	string

function_call ::=
	IDENTIFIER "(" [ expression { "," expression } ] ")"

constant ::=
	STRING |
	INT32 |
	INT64 |
	UINT32 |
	UINT64 |
	REAL |
	NULL

Terminal symbols

IDENTIFIER ::= [A-Za-z_\$][A-Za-z_\$0-9]*
COMPOUND_IDENTIFIER ::= { IDENTIFIER}(::{ IDENTIFIER})+
INTEGER ::= \-?(0x)?[0-9]+
INT32 ::= INTEGER
INT64 ::= {INTEGER}L
UINT32 ::= {INTEGER}U
UINT64 ::= {INTEGER}(UL|LU)
REAL ::= \-?[0-9]+\.[0-9]+