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|
package subex
import (
"main/walk"
"errors"
"strconv"
)
func sumValues(values []walk.Value) ([]walk.Value, error) {
allBools := true
var sum float64 = 0
var any bool = false
for _, value := range values {
switch v := value.(type) {
case walk.NullValue:
allBools = false
case walk.BoolValue:
if v {
sum += 1
any = true
}
case walk.NumberValue:
allBools = false
sum += float64(v)
case walk.StringValue:
allBools = false
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
sum += num
} else {
return nil, errors.New("Tried to sum non-castable string")
}
default:
return nil, errors.New("Tried to sum non-number")
}
}
if allBools {
return []walk.Value{walk.BoolValue(any)}, nil
} else {
return []walk.Value{walk.NumberValue(sum)}, nil
}
}
// Compounds atoms into values, if all values are booleans, does AND, if not, tries to cast to numbers and multiply
func multiplyValues(values []walk.Value) ([]walk.Value, error) {
allBools := true
var product float64 = 1
var all bool = false
for _, value := range values {
switch v := value.(type) {
case walk.NullValue:
allBools = false
product *= 0
case walk.BoolValue:
if !v {
product *= 0
all = false
}
case walk.NumberValue:
allBools = false
product *= float64(v)
case walk.StringValue:
allBools = false
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
product *= num
} else {
return nil, errors.New("Tried to multiply non-castable string")
}
default:
return nil, errors.New("Tried to multiply non-number")
}
}
if allBools {
return []walk.Value{walk.BoolValue(all)}, nil
} else {
return []walk.Value{walk.NumberValue(product)}, nil
}
}
// Does tries to cast all to numbers and negates them
func negateValues(values []walk.Value) ([]walk.Value, error) {
var negatedNumbers []walk.Value
for _, value := range values {
switch v := value.(type) {
case walk.NullValue:
negatedNumbers = append(negatedNumbers, walk.NumberValue(0))
case walk.BoolValue:
if v {
negatedNumbers = append(negatedNumbers, walk.NumberValue(-1))
} else {
negatedNumbers = append(negatedNumbers, walk.NumberValue(0))
}
case walk.NumberValue:
negatedNumbers = append(negatedNumbers, walk.NumberValue(-float64(v)))
case walk.StringValue:
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
negatedNumbers = append(negatedNumbers, walk.NumberValue(-num))
} else {
return nil, errors.New("Tried to negate non-castable string")
}
default:
return nil, errors.New("Tried to negate non-number")
}
}
return negatedNumbers, nil
}
// If all are castable to numbers, takes reciprocals of all and returns them
// Else errors
func reciprocalValues(values []walk.Value) ([]walk.Value, error) {
var reciprocals []walk.Value
for _, value := range values {
switch v := value.(type) {
case walk.NullValue:
return nil, errors.New("Tried to take reciprocal of null")
case walk.BoolValue:
if v {
reciprocals = append(reciprocals, walk.NumberValue(1))
} else {
return nil, errors.New("Tried to take reciprocal of false")
}
case walk.NumberValue:
reciprocals = append(reciprocals, walk.NumberValue(1 / float64(v)))
case walk.StringValue:
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
reciprocals = append(reciprocals, walk.NumberValue(1 / num))
} else {
return nil, errors.New("Tried to take reciprocal of non-castable string")
}
default:
return nil, errors.New("Tried to take reciprocal of non-number")
}
}
return reciprocals, nil
}
// If all are castable to booleans, NOTs all and returns them
// Else errors
func notValues(values []walk.Value) (notted []walk.Value, err error) {
for _, value := range values {
switch v := value.(type) {
case walk.NullValue:
notted = append(notted, walk.BoolValue(true))
case walk.BoolValue:
notted = append(notted, walk.BoolValue(!bool(v)))
case walk.NumberValue:
notted = append(notted, walk.BoolValue(v == 0))
case walk.StringValue:
notted = append(notted, walk.BoolValue(len(v) == 0))
default:
return nil, errors.New("Tried to NOT non-boolean")
}
}
return notted, nil
}
// Returns true if all values are equal, false if not
func equalValues(values []walk.Value) ([]walk.Value, error) {
if len(values) == 0 {
return []walk.Value{walk.BoolValue(true)}, nil
}
first := values[0]
for _, value := range values[1:] {
// TODO: Refine the equality check
if value != first {
return []walk.Value{walk.BoolValue(false)}, nil
}
}
return []walk.Value{walk.BoolValue(true)}, nil
}
|
