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# Grammar for Chapter 1
```antlrv4
grammar SimpleLanguage;
program
: declaration* statement+ EOF
;
declaration
: type IDENTIFIER ';'
;
type
: 'int'
;
statement
: 'if' '(' expression ')' statement
| 'if' '(' expression ')' statement 'else' statement
| 'while' '(' expression ')' statement
| IDENTIFIER '=' expression ';'
| '{' declaration* statement+ '}'
| 'break' ';'
;
expression
: primaryExpression # PrimaryExpression_
| expression ('*' | '/' ) expression # ArithmeticOrLogicalExpression
| expression ('+' | '-') expression # ArithmeticOrLogicalExpression
;
primaryExpression
:
| INTEGER_LITERAL
| IDENTIFIER
| '(' expression ')'
;
```
|
