55 lines
999 B
Plaintext
55 lines
999 B
Plaintext
grammar t015calc;
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options {
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language = Python3;
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}
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@header {
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import math
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}
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@parser::init {
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self.reportedErrors = []
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}
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@parser::members {
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def emitErrorMessage(self, msg):
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self.reportedErrors.append(msg)
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}
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evaluate returns [result]: r=expression {result = r};
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expression returns [result]: r=mult (
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'+' r2=mult {r += r2}
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| '-' r2=mult {r -= r2}
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)* {result = r};
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mult returns [result]: r=log (
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'*' r2=log {r *= r2}
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| '/' r2=log {r /= r2}
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// | '%' r2=log {r %= r2}
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)* {result = r};
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log returns [result]: 'ln' r=exp {result = math.log(r)}
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| r=exp {result = r}
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;
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exp returns [result]: r=atom ('^' r2=atom {r = math.pow(r,r2)} )? {result = r}
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;
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atom returns [result]:
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n=INTEGER {result = int($n.text)}
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| n=DECIMAL {result = float($n.text)}
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| '(' r=expression {result = r} ')'
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| 'PI' {result = math.pi}
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| 'E' {result = math.e}
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;
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INTEGER: DIGIT+;
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DECIMAL: DIGIT+ '.' DIGIT+;
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fragment
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DIGIT: '0'..'9';
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WS: (' ' | '\n' | '\t')+ {$channel = HIDDEN};
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