Lisc/LiscMathModule.m at master · frozenbears/Lisc · GitHub

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#import "LiscMathModule.h"
#import "LiscCallBlock.h"
#import "LiscNumber.h"
#import "LiscError.h"
#import "LiscArgs.h"
#import "LiscBoolean.h"

@implementation LiscMathModule

- (void)setupBindings {

    LiscCallBlock add = ^(NSArray *args) {
        double sum;
        BOOL first = YES;

        [LiscArgs checkArgs:args
                  expecting:@[[LiscNumber class], [LiscNumber class]]
                   variadic:YES];

        for (LiscNumber *n in args) {
            if (first) {
                sum = [n.number doubleValue];
                first = NO;
            } else {
                sum += [((LiscNumber *)n).number doubleValue];
            }
        }

        return (id)[LiscNumber numberWithNumber:@(sum)];
    };

    LiscCallBlock subtract = ^(NSArray *args) {
        double difference;
        BOOL first = YES;

        [LiscArgs checkArgs:args
                  expecting:@[[LiscNumber class], [LiscNumber class]]
                   variadic:YES];

        for (LiscNumber *n in args) {
            if (first) {
                difference = [n.number doubleValue];
                first = NO;
            } else {
                difference -= [((LiscNumber *)n).number doubleValue];
            }
        }
        return (id)[LiscNumber numberWithNumber:@(difference)];
    };

    LiscCallBlock lessThan = ^(NSArray *args) {
        [LiscArgs checkArgs:args expecting:@[[LiscNumber class], [LiscNumber class]]];
        LiscNumber *first = [args objectAtIndex:0];
        LiscNumber *second = [args objectAtIndex:1];
        BOOL b = first.number.doubleValue < second.number.doubleValue;
        return (id)[LiscBoolean booleanWithValue:b];
    };

    self.bindings[@"+"] = [LiscFunction functionWithBlock:add];
    self.bindings[@"-"] = [LiscFunction functionWithBlock:subtract];
    self.bindings[@"<"] = [LiscFunction functionWithBlock:lessThan];
}

@end