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package subex
import (
"main/walk"
"errors"
"strconv"
)
func sumValues(values walk.ValueList) (walk.ValueList, error) {
allBools := true
var sum float64 = 0
var any bool = false
for _, value := range values {
switch v := value.(type) {
case walk.NullScalar:
allBools = false
case walk.BoolScalar:
if v {
sum += 1
any = true
}
case walk.NumberScalar:
allBools = false
sum += float64(v)
case walk.StringStructure:
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.ValueList{walk.BoolScalar(any)}, nil
} else {
return walk.ValueList{walk.NumberScalar(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.ValueList) (walk.ValueList, error) {
allBools := true
var product float64 = 1
var all bool = false
for _, value := range values {
switch v := value.(type) {
case walk.NullScalar:
allBools = false
product *= 0
case walk.BoolScalar:
if !v {
product *= 0
all = false
}
case walk.NumberScalar:
allBools = false
product *= float64(v)
case walk.StringStructure:
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.ValueList{walk.BoolScalar(all)}, nil
} else {
return walk.ValueList{walk.NumberScalar(product)}, nil
}
}
// Does tries to cast all to numbers and negates them
func negateValues(values walk.ValueList) (walk.ValueList, error) {
var negatedNumbers walk.ValueList
for _, value := range values {
switch v := value.(type) {
case walk.NullScalar:
negatedNumbers = append(negatedNumbers, walk.NumberScalar(0))
case walk.BoolScalar:
if v {
negatedNumbers = append(negatedNumbers, walk.NumberScalar(-1))
} else {
negatedNumbers = append(negatedNumbers, walk.NumberScalar(0))
}
case walk.NumberScalar:
negatedNumbers = append(negatedNumbers, walk.NumberScalar(-float64(v)))
case walk.StringStructure:
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
negatedNumbers = append(negatedNumbers, walk.NumberScalar(-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.ValueList) (walk.ValueList, error) {
var reciprocals walk.ValueList
for _, value := range values {
switch v := value.(type) {
case walk.NullScalar:
return nil, errors.New("Tried to take reciprocal of null")
case walk.BoolScalar:
if v {
reciprocals = append(reciprocals, walk.NumberScalar(1))
} else {
return nil, errors.New("Tried to take reciprocal of false")
}
case walk.NumberScalar:
reciprocals = append(reciprocals, walk.NumberScalar(1 / float64(v)))
case walk.StringStructure:
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
reciprocals = append(reciprocals, walk.NumberScalar(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.ValueList) (notted walk.ValueList, err error) {
for _, value := range values {
switch v := value.(type) {
case walk.NullScalar:
notted = append(notted, walk.BoolScalar(true))
case walk.BoolScalar:
notted = append(notted, walk.BoolScalar(!bool(v)))
case walk.NumberScalar:
notted = append(notted, walk.BoolScalar(v == 0))
case walk.StringStructure:
notted = append(notted, walk.BoolScalar(len(v) == 0))
default:
return nil, errors.New("Tried to NOT non-boolean")
}
}
return notted, nil
}
|
