Created
June 15, 2011 06:04
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simple grammar
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grammar pascalminus; | |
options | |
{ | |
output = AST; | |
language = Java; | |
// If generating an AST (output=AST; option) or specifying a tree walker then | |
// also add the following line | |
ASTLabelType=CommonTree; | |
} | |
prog : (prog_entity)* | |
; | |
prog_entity | |
: func_decl | |
; | |
func_decl | |
: DEF ID param_list? '{' block '}' ';' | |
; | |
param_list | |
: '(' ID (',' ID)* ')' | |
; | |
block : stat* | |
; | |
stat : expr | |
| assignment | |
| ifstmt | |
| return_stmt | |
| for_stmt | |
; | |
for_stmt: FOR ID IN '('? range_start '..' range_end ')'? '{' block '}' ';' | |
| WHILE '(' boolx ')' '{' block '}' ';' | |
; | |
range_start | |
: (INT|ID) | |
; | |
range_end: (INT|ID) | |
; | |
return_stmt | |
: RETURN expr ';' | |
; | |
ifstmt : IF '(' boolx ')' '{' block '}' (ELSE '{' block '}')? ';' | |
; | |
assignment | |
: ID ASSIGN expr ';' | |
; | |
boolx : eqexpr (('&&' | '||') eqexpr)* | |
; | |
eqexpr : boolatom (('==' | '>' | '<' | '<=' | '>=') boolatom)* | |
; | |
boolatom: INT | |
| ID | |
| '(' boolx ')' | |
; | |
expr : multexpr (('+' | '-') multexpr)* | |
; | |
multexpr: atom (('*' | '/') atom)* | |
; | |
atom : INT | |
| '(' expr ')' | |
| ID //| ID ('(' expr_list? ')')? // Function call | |
; | |
expr_list | |
: expr (',' expr)* | |
; | |
BEGIN : 'begin' | |
; | |
DEF : 'def' | |
; | |
END : 'end' | |
; | |
RETURN : 'return' | |
; | |
IF : 'if' | |
; | |
ELSE : 'else' | |
; | |
FOR : 'for' | |
; | |
IN : 'in' | |
; | |
TYPE : 'type' | |
; | |
FOREACH : 'foreach' | |
; | |
WHILE : 'while' | |
; | |
BREAK : 'break' | |
; | |
CASE : 'case' | |
; | |
DEFAULT : 'default' | |
; | |
INTEGER : 'integer' | |
; | |
STRING : 'string' | |
; | |
ARRAYOF : 'arrayof' | |
; | |
ASSIGN : ':=' | |
; | |
ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')* | |
; | |
INT : '0'..'9'+ | |
; | |
WS : ( ' ' | |
| '\t' | |
| ( '\r\n' // DOS | |
| '\r' // MAC | |
| '\n' // Unix | |
) | |
) {$channel=HIDDEN;} | |
; |
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def func(x) { | |
x := 2; | |
if(x == 0) { | |
y := 10; | |
}; | |
while(y < 10) { | |
y := y + 1; | |
}; | |
for i in 1..100 { | |
x := x * i; | |
}; | |
return z - 10; | |
}; | |
def func{ | |
}; | |
def func1(x, y) { | |
}; |
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