mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-05 03:17:50 +08:00
95 lines
2.7 KiB
Go
95 lines
2.7 KiB
Go
package vals
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"math/big"
|
|
"reflect"
|
|
"strconv"
|
|
|
|
"src.elv.sh/pkg/parse"
|
|
)
|
|
|
|
// Reprer wraps the Repr method.
|
|
type Reprer interface {
|
|
// Repr returns a string that represents a Value. The string either be a
|
|
// literal of that Value that is preferably deep-equal to it (like `[a b c]`
|
|
// for a list), or a string enclosed in "<>" containing the kind and
|
|
// identity of the Value(like `<fn 0xdeadcafe>`).
|
|
//
|
|
// If indent is at least 0, it should be pretty-printed with the current
|
|
// indentation level of indent; the indent of the first line has already
|
|
// been written and shall not be written in Repr. The returned string
|
|
// should never contain a trailing newline.
|
|
Repr(indent int) string
|
|
}
|
|
|
|
// ReprPlain is like Repr, but without pretty-printing.
|
|
func ReprPlain(v any) string {
|
|
return Repr(v, math.MinInt)
|
|
}
|
|
|
|
// Repr returns the representation for a value, a string that is preferably
|
|
// (but not necessarily) an Elvish expression that evaluates to the argument.
|
|
// The representation is pretty-printed, using indent as the initial level of
|
|
// indentation. It is implemented for the builtin types nil, bool and string,
|
|
// the File, List and Map types, StructMap types, and types satisfying the
|
|
// Reprer interface. For other types, it uses fmt.Sprint with the format
|
|
// "<unknown %v>".
|
|
func Repr(v any, indent int) string {
|
|
switch v := v.(type) {
|
|
case nil:
|
|
return "$nil"
|
|
case bool:
|
|
if v {
|
|
return "$true"
|
|
}
|
|
return "$false"
|
|
case string:
|
|
return parse.Quote(v)
|
|
case int:
|
|
return "(num " + strconv.Itoa(v) + ")"
|
|
case *big.Int:
|
|
return "(num " + v.String() + ")"
|
|
case *big.Rat:
|
|
return "(num " + v.String() + ")"
|
|
case float64:
|
|
return "(num " + formatFloat64(v) + ")"
|
|
case Reprer:
|
|
return v.Repr(indent)
|
|
case File:
|
|
return fmt.Sprintf("<file{%s %d}>", parse.Quote(v.Name()), v.Fd())
|
|
case List:
|
|
b := NewListReprBuilder(indent)
|
|
for it := v.Iterator(); it.HasElem(); it.Next() {
|
|
b.WriteElem(Repr(it.Elem(), indent+1))
|
|
}
|
|
return b.String()
|
|
case Map:
|
|
builder := NewMapReprBuilder(indent)
|
|
for it := v.Iterator(); it.HasElem(); it.Next() {
|
|
k, v := it.Elem()
|
|
builder.WritePair(Repr(k, indent+1), indent+2, Repr(v, indent+2))
|
|
}
|
|
return builder.String()
|
|
case StructMap:
|
|
return reprStructMap(v, indent)
|
|
case PseudoStructMap:
|
|
return reprStructMap(v.Fields(), indent)
|
|
default:
|
|
return fmt.Sprintf("<unknown %v>", v)
|
|
}
|
|
}
|
|
|
|
func reprStructMap(v StructMap, indent int) string {
|
|
vValue := reflect.ValueOf(v)
|
|
vType := vValue.Type()
|
|
builder := NewMapReprBuilder(indent)
|
|
it := iterateStructMap(vType)
|
|
for it.Next() {
|
|
k, v := it.Get(vValue)
|
|
builder.WritePair(Repr(k, indent+1), indent+2, Repr(v, indent+2))
|
|
}
|
|
return builder.String()
|
|
}
|