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tag: 0.6.1
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// Copyright 2010 Todd Ditchendorf
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#import "TDArithmeticAssembler.h"
#import <ParseKit/ParseKit.h>
@implementation TDArithmeticAssembler
- (void)parser:(PKParser *)p didMatchPlus:(PKAssembly *)a {
PKToken *tok2 = [a pop];
PKToken *tok1 = [a pop];
[a push:[NSNumber numberWithDouble:tok1.floatValue + tok2.floatValue]];
}
- (void)parser:(PKParser *)p didMatchMinus:(PKAssembly *)a {
PKToken *tok2 = [a pop];
PKToken *tok1 = [a pop];
[a push:[NSNumber numberWithDouble:tok1.floatValue - tok2.floatValue]];
}
- (void)parser:(PKParser *)p didMatchTimes:(PKAssembly *)a {
PKToken *tok2 = [a pop];
PKToken *tok1 = [a pop];
[a push:[NSNumber numberWithDouble:tok1.floatValue * tok2.floatValue]];
}
- (void)parser:(PKParser *)p didMatchDivide:(PKAssembly *)a {
PKToken *tok2 = [a pop];
PKToken *tok1 = [a pop];
[a push:[NSNumber numberWithDouble:tok1.floatValue / tok2.floatValue]];
}
- (void)parser:(PKParser *)p didMatchExp:(PKAssembly *)a {
PKToken *tok2 = [a pop];
PKToken *tok1 = [a pop];
double n1 = tok1.floatValue;
double n2 = tok2.floatValue;
double res = n1;
for (NSUInteger i = 1; i < n2; i++) {
res *= n1;
}
[a push:[NSNumber numberWithDouble:res]];
}
@end
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