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|
grammar t015calc;
options {
language = Python;
}
@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};
|
