antlr same type arithmetic expression Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) The Ask Question Wizard is Live! Data science time! April 2019 and salary with experience Should we burninate the [wrap] tag?What are POD types in C++?What's the canonical way to check for type in Python?How to determine a Python variable's type?What are the differences between type() and isinstance()?A grammar for one variable functions in ANTLRAssignment as expression in Antlr grammarCreating multidimensional arrays from ANTLR grammarIncorrect Parsing of simple arithmetic grammar in ANTLRMutually left-recursive?Antlr: Reference to data not yet parsed
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antlr same type arithmetic expression
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
The Ask Question Wizard is Live!
Data science time! April 2019 and salary with experience
Should we burninate the [wrap] tag?What are POD types in C++?What's the canonical way to check for type in Python?How to determine a Python variable's type?What are the differences between type() and isinstance()?A grammar for one variable functions in ANTLRAssignment as expression in Antlr grammarCreating multidimensional arrays from ANTLR grammarIncorrect Parsing of simple arithmetic grammar in ANTLRMutually left-recursive?Antlr: Reference to data not yet parsed
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Trying to write a antlr grammar that parse the arithmetic expression for only same typed variable. If it is not a same type as left or right side, it should not be parse. This is what I have;
stat
: Left = VARIABLE Op = ASSIGMENT Right = expr # Assigment
;
expr
: '(' Exp = expr ')' # Parens
| MINUS Exp = expr # UnaryMinus
| Left = expr Op = (TIMES | DIV) Right = expr # MulDiv
| Left = expr Op = (PLUS | MINUS) Right = expr # AddSub
| (VARIABLE | CONSTANT) # Element
;
ASSIGMENT : '=' ;
PLUS : '+' ;
MINUS : '-' ;
TIMES : '*' ;
DIV : '/' ;
LPAREN : '(' ;
RPAREN : ')' ;
I don't want anything like x = 5 + 'f' or x = c - 5, (if c is variable that is not integer)
math types expression antlr
asked Mar 8 at 16:15
Kevin SKevin S
171
add a comment |
Trying to write a antlr grammar that parse the arithmetic expression for only same typed variable. If it is not a same type as left or right side, it should not be parse. This is what I have;
stat
: Left = VARIABLE Op = ASSIGMENT Right = expr # Assigment
;
expr
: '(' Exp = expr ')' # Parens
| MINUS Exp = expr # UnaryMinus
| Left = expr Op = (TIMES | DIV) Right = expr # MulDiv
| Left = expr Op = (PLUS | MINUS) Right = expr # AddSub
| (VARIABLE | CONSTANT) # Element
;
ASSIGMENT : '=' ;
PLUS : '+' ;
MINUS : '-' ;
TIMES : '*' ;
DIV : '/' ;
LPAREN : '(' ;
RPAREN : ')' ;
I don't want anything like x = 5 + 'f' or x = c - 5, (if c is variable that is not integer)
math types expression antlr
asked Mar 8 at 16:15
Kevin SKevin S
171
4
You can't enforce that kind of constraint in the grammar. You'd check these things in the type checker, not the parser.
– sepp2k
Mar 8 at 19:42
add a comment |
Trying to write a antlr grammar that parse the arithmetic expression for only same typed variable. If it is not a same type as left or right side, it should not be parse. This is what I have;
stat
: Left = VARIABLE Op = ASSIGMENT Right = expr # Assigment
;
expr
: '(' Exp = expr ')' # Parens
| MINUS Exp = expr # UnaryMinus
| Left = expr Op = (TIMES | DIV) Right = expr # MulDiv
| Left = expr Op = (PLUS | MINUS) Right = expr # AddSub
| (VARIABLE | CONSTANT) # Element
;
ASSIGMENT : '=' ;
PLUS : '+' ;
MINUS : '-' ;
TIMES : '*' ;
DIV : '/' ;
LPAREN : '(' ;
RPAREN : ')' ;
I don't want anything like x = 5 + 'f' or x = c - 5, (if c is variable that is not integer)
math types expression antlr
asked Mar 8 at 16:15
Kevin SKevin S
171
Trying to write a antlr grammar that parse the arithmetic expression for only same typed variable. If it is not a same type as left or right side, it should not be parse. This is what I have;
stat
: Left = VARIABLE Op = ASSIGMENT Right = expr # Assigment
;
expr
: '(' Exp = expr ')' # Parens
| MINUS Exp = expr # UnaryMinus
| Left = expr Op = (TIMES | DIV) Right = expr # MulDiv
| Left = expr Op = (PLUS | MINUS) Right = expr # AddSub
| (VARIABLE | CONSTANT) # Element
;
ASSIGMENT : '=' ;
PLUS : '+' ;
MINUS : '-' ;
TIMES : '*' ;
DIV : '/' ;
LPAREN : '(' ;
RPAREN : ')' ;
I don't want anything like x = 5 + 'f' or x = c - 5, (if c is variable that is not integer)
math types expression antlr
math types expression antlr
asked Mar 8 at 16:15
Kevin SKevin S
171
asked Mar 8 at 16:15
Kevin SKevin S
171
asked Mar 8 at 16:15
Kevin SKevin S
171
asked Mar 8 at 16:15
Kevin SKevin S
171
asked Mar 8 at 16:15
Kevin SKevin S
171
171
4
You can't enforce that kind of constraint in the grammar. You'd check these things in the type checker, not the parser.
– sepp2k
Mar 8 at 19:42
add a comment |
4
You can't enforce that kind of constraint in the grammar. You'd check these things in the type checker, not the parser.
– sepp2k
Mar 8 at 19:42
4
4
You can't enforce that kind of constraint in the grammar. You'd check these things in the type checker, not the parser.
– sepp2k
Mar 8 at 19:42
You can't enforce that kind of constraint in the grammar. You'd check these things in the type checker, not the parser.
– sepp2k
Mar 8 at 19:42
add a comment |
1 Answer
1
active
oldest
votes
It's called Semantic analysis.
When parsing is done you have to walk through the generated AST and check correctness of each expression and variable.
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It's called Semantic analysis.
When parsing is done you have to walk through the generated AST and check correctness of each expression and variable.
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
add a comment |
It's called Semantic analysis.
When parsing is done you have to walk through the generated AST and check correctness of each expression and variable.
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
add a comment |
It's called Semantic analysis.
When parsing is done you have to walk through the generated AST and check correctness of each expression and variable.
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
It's called Semantic analysis.
When parsing is done you have to walk through the generated AST and check correctness of each expression and variable.
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
answered Mar 11 at 12:10
Pavel SmirnovPavel Smirnov
2,392818
2,392818
add a comment |
add a comment |
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4
You can't enforce that kind of constraint in the grammar. You'd check these things in the type checker, not the parser.
– sepp2k
Mar 8 at 19:42