| grammar t015calc; |
| options { |
| language =Cpp; |
| } |
| |
| @lexer::includes |
| { |
| #include "UserTestTraits.hpp" |
| } |
| @lexer::namespace |
| { Antlr3Test } |
| |
| @parser::includes { |
| #include "UserTestTraits.hpp" |
| } |
| @parser::namespace |
| { Antlr3Test } |
| |
| @header { |
| import math |
| } |
| |
| @parser::init { |
| self.reportedErrors = [] |
| } |
| |
| @parser::members { |
| def emitErrorMessage(self, msg): |
| self.reportedErrors.append(msg) |
| } |
| |
| evaluate returns [result]: r=expression {result = r}; |
| |
| expression returns [result]: r=mult ( |
| '+' r2=mult {r += r2} |
| | '-' r2=mult {r -= r2} |
| )* {result = r}; |
| |
| mult returns [result]: r=log ( |
| '*' r2=log {r *= r2} |
| | '/' r2=log {r /= r2} |
| // | '%' r2=log {r %= r2} |
| )* {result = r}; |
| |
| log returns [result]: 'ln' r=exp {result = math.log(r)} |
| | r=exp {result = r} |
| ; |
| |
| exp returns [result]: r=atom ('^' r2=atom {r = math.pow(r,r2)} )? {result = r} |
| ; |
| |
| atom returns [result]: |
| n=INTEGER {result = int($n.text)} |
| | n=DECIMAL {result = float($n.text)} |
| | '(' r=expression {result = r} ')' |
| | 'PI' {result = math.pi} |
| | 'E' {result = math.e} |
| ; |
| |
| INTEGER: DIGIT+; |
| |
| DECIMAL: DIGIT+ '.' DIGIT+; |
| |
| fragment |
| DIGIT: '0'..'9'; |
| |
| WS: (' ' | '\n' | '\t')+ {$channel = HIDDEN}; |