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package subex
import (
"main/walk"
"errors"
"strconv"
)
func sumValues(atoms []walk.Atom) ([]walk.Atom, error) {
allBools := true
var sum float64 = 0
var any bool = false
values, err := walk.Compound(atoms)
if err != nil {
return nil, err
}
for _, value := range values {
switch v := value.(type) {
case walk.ValueNull:
allBools = false
case walk.ValueBool:
if bool(v) {
sum += 1
any = true
}
case walk.ValueNumber:
allBools = false
sum += float64(v)
case walk.ValueString:
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.Atom{walk.ValueBool(any)}, nil
} else {
return []walk.Atom{walk.ValueNumber(sum)}, nil
}
}
// Compounds atoms into values, if all values are booleans, does AND, if not, tries to cast to numbers and multiply
func multiplyValues(atoms []walk.Atom) ([]walk.Atom, error) {
allBools := true
var product float64 = 1
var all bool = false
values, err := walk.Compound(atoms)
if err != nil {
return nil, err
}
for _, value := range values {
switch v := value.(type) {
case walk.ValueNull:
allBools = false
product *= 0
case walk.ValueBool:
if !bool(v) {
product *= 0
all = false
}
case walk.ValueNumber:
allBools = false
product *= float64(v)
case walk.ValueString:
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.Atom{walk.ValueBool(all)}, nil
} else {
return []walk.Atom{walk.ValueNumber(product)}, nil
}
}
// Does tries to cast all to numbers and negates them
func negateValues(atoms []walk.Atom) ([]walk.Atom, error) {
var negatedNumbers []walk.Atom
values, err := walk.Compound(atoms)
if err != nil {
return nil, err
}
for _, value := range values {
switch v := value.(type) {
case walk.ValueNull:
negatedNumbers = append(negatedNumbers, walk.ValueNumber(0))
case walk.ValueBool:
if bool(v) {
negatedNumbers = append(negatedNumbers, walk.ValueNumber(-1))
} else {
negatedNumbers = append(negatedNumbers, walk.ValueNumber(0))
}
case walk.ValueNumber:
negatedNumbers = append(negatedNumbers, walk.ValueNumber(-v))
case walk.ValueString:
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
negatedNumbers = append(negatedNumbers, walk.ValueNumber(-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(atoms []walk.Atom) ([]walk.Atom, error) {
var reciprocals []walk.Atom
values, err := walk.Compound(atoms)
if err != nil {
return nil, err
}
for _, value := range values {
switch v := value.(type) {
case walk.ValueNull:
return nil, errors.New("Tried to take reciprocal of null")
case walk.ValueBool:
if bool(v) {
reciprocals = append(reciprocals, walk.ValueNumber(1))
} else {
return nil, errors.New("Tried to take reciprocal of false")
}
case walk.ValueNumber:
reciprocals = append(reciprocals, walk.ValueNumber(1 / v))
case walk.ValueString:
num, err := strconv.ParseFloat(string(v), 64)
if err == nil {
reciprocals = append(reciprocals, walk.ValueNumber(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(atoms []walk.Atom) (notted []walk.Atom, err error) {
values, err := walk.Compound(atoms)
if err != nil {
return nil, err
}
for _, value := range values {
switch v := value.(type) {
case walk.ValueNull:
notted = append(notted, walk.ValueBool(true))
case walk.ValueBool:
notted = append(notted, walk.ValueBool(!v))
case walk.ValueNumber:
notted = append(notted, walk.ValueBool(v == 0))
case walk.ValueString:
notted = append(notted, walk.ValueBool(len(v) == 0))
default:
return nil, errors.New("Tried to NOT non-boolean")
}
}
return notted, nil
}
|
