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How to implement a correct If Then Else Statement in an Antlr Grammar?

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0

I'm working on a statement's extention on a .g4 grammar (named Simple.g4) in ANTLR, I'm trying to implement an "if then else Statement" including a new instruction called ifStatement in section statement but I'm having issue with the code I generated.

Is this the correct form to implement the if statement?

Here is the code I'm working with using Eclipse IDE + ANTLR Plugin:

grammar Simple;


//PARSER RULES


block : '' statement* '';




statement : assignment ';' 
 | deletion ';' 
 | print ';'
 | varDec ';' 
 | ifStatement ';' 
 | funDec ';' 
 | block;




assignment : ID '=' exp;


deletion : 'delete' ID; 

print : 'print' exp;

exp : '(' exp ')' #baseExp
 | '-' exp #negExp 
 | left=exp op=('*' | '/') right=exp #binExp
 | left=exp op=('+' | '-') right=exp #binExp
 | ID #varExp 
 | INT #valExp 
 | BOOL #valExp 
 | expression cmp='>' expression #boolExp 
 | expression cmp='<' expression #boolExp /
 | expression cmp='==' expression #boolExp
 | expression cmp='!=' expression #boolExp
 | expression cmp='>=' expression #boolExp
 | expression cmp='<=' expression #boolExp 



// If-Then-Else

 ifStatement : 'if' '(' exp ')' 'then' exp 'else' exp 



// LEXER RULES


TRUE : 'true' ;
FALSE : 'false';
IF : 'if' ;
THEN : 'then' ;
ELSE : 'else' ;
VAR : 'var' ; 
INT : 'int' ;
BOOL : 'bool' ;

//IDs

fragment CHAR : 'a'..'z' |'A'..'Z' ;
ID : CHAR (CHAR | DIGIT)* ;

fragment DIGIT : '0'..'9'; 
INT : DIGIT+;

//Boolean 
BOOL : 'true' | 'false';

//Escape Sequence
WS : (' '|'t'|'n'|'r')-> skip;
LINECOMMENTS : '//' (~('n'|'r'))* -> skip;
BLOCKCOMMENTS : '/*'( ~('/'|'*')|'/'~'*'|'*'~'/'|BLOCKCOMMENTS)* '*/' -> skip;

if-statement antlr grammar

share|improve this question

asked Mar 28 at 17:28

Nena RapsodyNena Rapsody

111 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you describe what issues you're having? It does seem a bit odd to have an if statement where the branches can only be expressions (especially since your language doesn't seem to have any expressions that have side effects).
  
  – sepp2k
  Mar 28 at 17:33
  

  
  
  
  

add a comment
 | 

0

I'm working on a statement's extention on a .g4 grammar (named Simple.g4) in ANTLR, I'm trying to implement an "if then else Statement" including a new instruction called ifStatement in section statement but I'm having issue with the code I generated.

Is this the correct form to implement the if statement?

Here is the code I'm working with using Eclipse IDE + ANTLR Plugin:

grammar Simple;


//PARSER RULES


block : '' statement* '';




statement : assignment ';' 
 | deletion ';' 
 | print ';'
 | varDec ';' 
 | ifStatement ';' 
 | funDec ';' 
 | block;




assignment : ID '=' exp;


deletion : 'delete' ID; 

print : 'print' exp;

exp : '(' exp ')' #baseExp
 | '-' exp #negExp 
 | left=exp op=('*' | '/') right=exp #binExp
 | left=exp op=('+' | '-') right=exp #binExp
 | ID #varExp 
 | INT #valExp 
 | BOOL #valExp 
 | expression cmp='>' expression #boolExp 
 | expression cmp='<' expression #boolExp /
 | expression cmp='==' expression #boolExp
 | expression cmp='!=' expression #boolExp
 | expression cmp='>=' expression #boolExp
 | expression cmp='<=' expression #boolExp 



// If-Then-Else

 ifStatement : 'if' '(' exp ')' 'then' exp 'else' exp 



// LEXER RULES


TRUE : 'true' ;
FALSE : 'false';
IF : 'if' ;
THEN : 'then' ;
ELSE : 'else' ;
VAR : 'var' ; 
INT : 'int' ;
BOOL : 'bool' ;

//IDs

fragment CHAR : 'a'..'z' |'A'..'Z' ;
ID : CHAR (CHAR | DIGIT)* ;

fragment DIGIT : '0'..'9'; 
INT : DIGIT+;

//Boolean 
BOOL : 'true' | 'false';

//Escape Sequence
WS : (' '|'t'|'n'|'r')-> skip;
LINECOMMENTS : '//' (~('n'|'r'))* -> skip;
BLOCKCOMMENTS : '/*'( ~('/'|'*')|'/'~'*'|'*'~'/'|BLOCKCOMMENTS)* '*/' -> skip;

if-statement antlr grammar

share|improve this question

asked Mar 28 at 17:28

Nena RapsodyNena Rapsody

111 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can you describe what issues you're having? It does seem a bit odd to have an if statement where the branches can only be expressions (especially since your language doesn't seem to have any expressions that have side effects).
  
  – sepp2k
  Mar 28 at 17:33
  

  
  
  
  

add a comment
 | 

I'm working on a statement's extention on a .g4 grammar (named Simple.g4) in ANTLR, I'm trying to implement an "if then else Statement" including a new instruction called ifStatement in section statement but I'm having issue with the code I generated.

Is this the correct form to implement the if statement?

Here is the code I'm working with using Eclipse IDE + ANTLR Plugin:

grammar Simple;


//PARSER RULES


block : '' statement* '';




statement : assignment ';' 
 | deletion ';' 
 | print ';'
 | varDec ';' 
 | ifStatement ';' 
 | funDec ';' 
 | block;




assignment : ID '=' exp;


deletion : 'delete' ID; 

print : 'print' exp;

exp : '(' exp ')' #baseExp
 | '-' exp #negExp 
 | left=exp op=('*' | '/') right=exp #binExp
 | left=exp op=('+' | '-') right=exp #binExp
 | ID #varExp 
 | INT #valExp 
 | BOOL #valExp 
 | expression cmp='>' expression #boolExp 
 | expression cmp='<' expression #boolExp /
 | expression cmp='==' expression #boolExp
 | expression cmp='!=' expression #boolExp
 | expression cmp='>=' expression #boolExp
 | expression cmp='<=' expression #boolExp 



// If-Then-Else

 ifStatement : 'if' '(' exp ')' 'then' exp 'else' exp 



// LEXER RULES


TRUE : 'true' ;
FALSE : 'false';
IF : 'if' ;
THEN : 'then' ;
ELSE : 'else' ;
VAR : 'var' ; 
INT : 'int' ;
BOOL : 'bool' ;

//IDs

fragment CHAR : 'a'..'z' |'A'..'Z' ;
ID : CHAR (CHAR | DIGIT)* ;

fragment DIGIT : '0'..'9'; 
INT : DIGIT+;

//Boolean 
BOOL : 'true' | 'false';

//Escape Sequence
WS : (' '|'t'|'n'|'r')-> skip;
LINECOMMENTS : '//' (~('n'|'r'))* -> skip;
BLOCKCOMMENTS : '/*'( ~('/'|'*')|'/'~'*'|'*'~'/'|BLOCKCOMMENTS)* '*/' -> skip;

if-statement antlr grammar

share|improve this question

asked Mar 28 at 17:28

Nena RapsodyNena Rapsody

111 bronze badge

grammar Simple;


//PARSER RULES


block : '' statement* '';




statement : assignment ';' 
 | deletion ';' 
 | print ';'
 | varDec ';' 
 | ifStatement ';' 
 | funDec ';' 
 | block;




assignment : ID '=' exp;


deletion : 'delete' ID; 

print : 'print' exp;

exp : '(' exp ')' #baseExp
 | '-' exp #negExp 
 | left=exp op=('*' | '/') right=exp #binExp
 | left=exp op=('+' | '-') right=exp #binExp
 | ID #varExp 
 | INT #valExp 
 | BOOL #valExp 
 | expression cmp='>' expression #boolExp 
 | expression cmp='<' expression #boolExp /
 | expression cmp='==' expression #boolExp
 | expression cmp='!=' expression #boolExp
 | expression cmp='>=' expression #boolExp
 | expression cmp='<=' expression #boolExp 



// If-Then-Else

 ifStatement : 'if' '(' exp ')' 'then' exp 'else' exp 



// LEXER RULES


TRUE : 'true' ;
FALSE : 'false';
IF : 'if' ;
THEN : 'then' ;
ELSE : 'else' ;
VAR : 'var' ; 
INT : 'int' ;
BOOL : 'bool' ;

//IDs

fragment CHAR : 'a'..'z' |'A'..'Z' ;
ID : CHAR (CHAR | DIGIT)* ;

fragment DIGIT : '0'..'9'; 
INT : DIGIT+;

//Boolean 
BOOL : 'true' | 'false';

//Escape Sequence
WS : (' '|'t'|'n'|'r')-> skip;
LINECOMMENTS : '//' (~('n'|'r'))* -> skip;
BLOCKCOMMENTS : '/*'( ~('/'|'*')|'/'~'*'|'*'~'/'|BLOCKCOMMENTS)* '*/' -> skip;

share|improve this question

asked Mar 28 at 17:28

Nena RapsodyNena Rapsody

111 bronze badge

share|improve this question

asked Mar 28 at 17:28

Nena RapsodyNena Rapsody

111 bronze badge

asked Mar 28 at 17:28

Nena RapsodyNena Rapsody

111 bronze badge

asked Mar 28 at 17:28

Nena RapsodyNena Rapsody

111 bronze badge