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comp.go
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comp.go
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package lit
import (
"fmt"
"log"
"xelf.org/xelf/knd"
"xelf.org/xelf/typ"
)
// log ignored equal errors for a while until we're certain everything is fine
const logEqual = true
// Equal returns whether two literal values are structurally equal.
// Value types and implementations are not compared.
func Equal(x, y Val) bool {
if x == nil || y == nil {
return y == x
}
if x.Nil() {
return y.Nil()
}
if y.Nil() {
return false
}
if x.Zero() {
return y.Zero()
}
if y.Zero() {
return false
}
k := x.Type().Kind & knd.All
switch {
case k&knd.Data == knd.Data:
xv, yv := x.Value(), y
if y.Type().Kind&knd.Data == knd.Data {
yv = y.Value()
}
return Equal(xv, yv)
case k == knd.Typ:
a, b, err := typePair(x, y)
if err != nil {
if logEqual {
log.Printf("equal type err: %v", err)
}
return false
}
return a.Equal(b)
case k&knd.Spec != 0:
return x == y
case k == knd.Bool:
a, b, err := boolPair(x, y)
if err != nil {
if logEqual {
log.Printf("equal bool err: %v", err)
}
return false
}
return a == b
case k&knd.Num != 0:
a, b, err := realPair(x, y)
if err != nil {
if logEqual {
log.Printf("equal num err: %v", err)
}
return false
}
return a == b
case k == knd.Span:
a, b, err := spanPair(x, y)
if err != nil {
if logEqual {
log.Printf("equal span err: %v", err)
}
return false
}
return a == b
case k == knd.Time:
a, b, err := timePair(x, y)
if err != nil {
if logEqual {
log.Printf("equal time err: %v", err)
}
return false
}
return a.Equal(b)
case k&knd.Char != 0:
a, b, err := strPair(x, y)
if err != nil {
if logEqual {
log.Printf("equal time err: %v", err)
}
return false
}
return a == b
case k&knd.Idxr != 0:
xi, ok := x.(Idxr)
if !ok {
if logEqual {
log.Printf("expect idxr got %T", x)
}
return false
}
yi, ok := y.(Idxr)
if !ok || xi.Len() != yi.Len() {
return false
}
err := xi.IterIdx(func(idx int, xv Val) error {
yv, err := yi.Idx(idx)
if err != nil {
return err
}
if ok = Equal(xv, yv); !ok {
return BreakIter
}
return nil
})
if err != nil {
if logEqual {
log.Printf("equal idxr err: %v", err)
}
return false
}
return ok
case k&knd.Keyr != 0:
xk, ok := x.(Keyr)
if !ok {
if logEqual {
log.Printf("expect keyr got %T", x)
}
return false
}
yk, ok := y.(Keyr)
if !ok || xk.Len() != yk.Len() {
return false
}
err := xk.IterKey(func(key string, xv Val) error {
yv, err := yk.Key(key)
if err != nil {
return err
}
if ok = Equal(xv, yv); !ok {
return BreakIter
}
return nil
})
if err != nil {
if logEqual {
log.Printf("equal keyr err: %v", err)
}
return false
}
return ok
}
panic("cannot equal %[1]T %[1]s, %[2]T %[2]s")
}
func Compare(x, y Val) (int8, error) {
k := x.Type().Kind & knd.Data
if k == knd.Void {
if y.Type().Kind != k {
return -1, nil
}
return 0, nil
}
if k == knd.Bool {
a, b, err := boolPair(x, y)
if err != nil {
return 0, err
}
if !a && b {
return -1, nil
}
if a && !b {
return 1, nil
}
return 0, nil
}
if k&knd.Num != 0 {
a, b, err := realPair(x, y)
if err != nil {
return 0, err
}
if a < b {
return -1, nil
}
if a > b {
return 1, nil
}
return 0, nil
}
if k == knd.Span {
a, b, err := spanPair(x, y)
if err != nil {
return 0, err
}
if a < b {
return -1, nil
}
if a > b {
return 1, nil
}
return 0, nil
}
if k == knd.Time {
a, b, err := timePair(x, y)
if err != nil {
return 0, err
}
if b.After(a) {
return -1, nil
}
if a.After(b) {
return 1, nil
}
return 0, nil
}
if k&knd.Str != 0 {
a, b, err := strPair(x, y)
if err != nil {
return 0, err
}
if a < b {
return -1, nil
}
if a > b {
return 1, nil
}
return 0, nil
}
return 0, fmt.Errorf("cannot compare %[1]T %[1]s, %[2]T %[2]s", x, y)
}
func boolPair(x, y Val) (a, b Bool, err error) {
if a, err = ToBool(x); err == nil {
b, err = ToBool(y)
}
return
}
func realPair(x, y Val) (a, b Real, err error) {
if a, err = ToReal(x); err == nil {
b, err = ToReal(y)
}
return
}
func strPair(x, y Val) (a, b Str, err error) {
if a, err = ToStr(x); err == nil {
b, err = ToStr(y)
}
return
}
func spanPair(x, y Val) (a, b Span, err error) {
if a, err = ToSpan(x); err == nil {
b, err = ToSpan(y)
}
return
}
func timePair(x, y Val) (a, b Time, err error) {
if a, err = ToTime(x); err == nil {
b, err = ToTime(y)
}
return
}
func typePair(x, y Val) (a, b typ.Type, err error) {
if a, err = typ.ToType(x); err == nil {
b, err = typ.ToType(y)
}
return
}