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package subex
import (
"main/walk"
"errors"
)
func binopAdd(values []walk.Value) ([]walk.Value, error) {
if len(values) != 2 {
return nil, errors.New("Tried to sum a weird number of values")
}
lhs, lhsIsNumber := values[0].(walk.NumberValue)
if !lhsIsNumber {
return nil, errors.New("Tried to sum a lhs that is not a number")
}
rhs, rhsIsNumber := values[1].(walk.NumberValue)
if !rhsIsNumber {
return nil, errors.New("Tried to sum a rhs that is not a number")
}
return []walk.Value{walk.NumberValue(float64(lhs) + float64(rhs))}, nil
}
func binopMultiply(values []walk.Value) ([]walk.Value, error) {
if len(values) != 2 {
return nil, errors.New("Tried to multiply a weird number of values")
}
lhs, lhsIsNumber := values[0].(walk.NumberValue)
if !lhsIsNumber {
return nil, errors.New("Tried to multiply a lhs that is not a number")
}
rhs, rhsIsNumber := values[1].(walk.NumberValue)
if !rhsIsNumber {
return nil, errors.New("Tried to multiply a rhs that is not a number")
}
return []walk.Value{walk.NumberValue(float64(lhs) * float64(rhs))}, nil
}
func binopDivide(values []walk.Value) ([]walk.Value, error) {
if len(values) != 2 {
return nil, errors.New("Tried to divide a weird number of values")
}
lhs, lhsIsNumber := values[0].(walk.NumberValue)
if !lhsIsNumber {
return nil, errors.New("Tried to divide a lhs that is not a number")
}
rhs, rhsIsNumber := values[1].(walk.NumberValue)
if !rhsIsNumber {
return nil, errors.New("Tried to divide a rhs that is not a number")
}
return []walk.Value{walk.NumberValue(float64(lhs) / float64(rhs))}, nil
}
func arithmeticSum(values []walk.Value) ([]walk.Value, error) {
var total float64 = 0
for _, value := range values {
n, isNumber := value.(walk.NumberValue)
if !isNumber {
return nil, errors.New("Tried to sum non-number value")
}
total += float64(n)
}
return []walk.Value{walk.NumberValue(total)}, nil
}
func arithmeticProduct(values []walk.Value) ([]walk.Value, error) {
var product float64 = 0
for _, value := range values {
n, isNumber := value.(walk.NumberValue)
if !isNumber {
return nil, errors.New("Tried to sum non-number value")
}
product *= float64(n)
}
return []walk.Value{walk.NumberValue(product)}, nil
}
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