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Keyvan-dadashzadeh-97522148 #10

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HW4-keyvan-dadashzadeh-97522148
keyvan1379 Jul 2, 2021
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HW4-keyvan-dadashzadeh-97522148
keyvan1379 Jul 2, 2021
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76 changes: 76 additions & 0 deletions HW4-keyvan-dadashzadeh-97522148/Q2/Q2.g4
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Original file line number Diff line number Diff line change
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grammar Q2;

program: mainClass ( classDeclaration )* EOF;

mainClass:
'class' identifier '{' 'public' 'static' 'void' 'main' '(' 'String' '[' ']' identifier ')' '{' statement '}' '}'
;

classDeclaration: 'class' id1=identifier ( 'extends' identifier )? '{' ( varDeclaration )* ( methodDeclaration )* '}';

varDeclaration: type identifier ';';

methodDeclaration:
'public' type id1=identifier '(' ( type id2=identifier ( ',' type id3=identifier )* )? ')' '{' ( varDeclaration )* ( statement )* 'return' expression ';' '}'
;

type:
'int' '[' ']'
| 'boolean'
| 'int'
| identifier;

statement returns [value_attr=str(), type_attr = str()]:
'if' '(' expression ')' st1=statement 'else' st2=statement #state_if
| '{' ( statement )* '}' #state_brace
| 'while' '(' expression ')' st1=statement #state_while
| 'System.out.println' '(' expression ')' ';' #state_println
| identifier '=' expression ';' #state_equal_assign
| identifier '[' first=expression ']' '=' second=expression ';' #state_access_array_assign
;


expression returns [value_attr=str(), type_attr = str()]
:
id=identifier #expr_term_id
| first=expression '&&' second=expression #expr_term_and
| '!' expression #expr_term_not
| INTEGER_LITERAL #expr_term_int
| first=expression '<' second=expression #expr_term_less
| first=expression '+' second=expression #expr_term_plus
| 'true' #expr_term_true
| first=expression '-' second=expression #expr_term_minus
| 'false' #expr_term_false
| '(' expression ')' #expr_term_paran
| first=expression '*' second=expression #expr_term_multiply
| first=expression '.' id=identifier '(' ( second=expression ( ',' expression )* )? ')'#expr_term_call_function
| 'this' #expr_term_useless_1
| 'new' 'int' '[' expression ']' #expr_term_useless_2
| 'new' identifier '(' ')' #expr_term_useless_3
| first=expression '[' second=expression ']' #expr_term_useless_4
| expression '.' 'length' #expr_term_useless_5
;


identifier returns [value_attr=str(), type_attr = str()]:
IDENTIFIER
;

/* lexical rules */
INTEGER_LITERAL :
DIGIT+;


IDENTIFIER: LETTER(LETTER | '_' | DIGIT)*;

fragment LETTER: [a-zA-Z];

fragment DIGIT: [0-9];

Whitespace: ('\t' | ' ')+ -> skip;

BlockComment: '/*' .*? '*/' -> skip;

LineComment: '//' ~ ('\r' | '\n')* -> skip;

Newline: ('\r' '\n'? | '\n') -> skip;
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