mirror of
https://github.com/go-sylixos/elvish.git
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96 lines
2.7 KiB
Go
96 lines
2.7 KiB
Go
package vals
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import (
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"fmt"
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"math"
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"math/big"
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"reflect"
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"strconv"
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"src.elv.sh/pkg/parse"
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)
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// Reprer wraps the Repr method.
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type Reprer interface {
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// Repr returns a string that represents a Value. The string either be a
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// literal of that Value that is preferably deep-equal to it (like `[a b c]`
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// for a list), or a string enclosed in "<>" containing the kind and
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// identity of the Value(like `<fn 0xdeadcafe>`).
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//
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// If indent is at least 0, it should be pretty-printed with the current
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// indentation level of indent; the indent of the first line has already
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// been written and shall not be written in Repr. The returned string
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// should never contain a trailing newline.
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Repr(indent int) string
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}
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// ReprPlain is like Repr, but without pretty-printing.
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func ReprPlain(v interface{}) string {
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// TODO: Change to math.MinInt when Go 1.17 is required.
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return Repr(v, math.MinInt32)
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}
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// Repr returns the representation for a value, a string that is preferably
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// (but not necessarily) an Elvish expression that evaluates to the argument.
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// The representation is pretty-printed, using indent as the initial level of
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// indentation. It is implemented for the builtin types nil, bool and string,
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// the File, List and Map types, StructMap types, and types satisfying the
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// Reprer interface. For other types, it uses fmt.Sprint with the format
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// "<unknown %v>".
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func Repr(v interface{}, indent int) string {
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switch v := v.(type) {
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case nil:
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return "$nil"
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case bool:
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if v {
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return "$true"
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}
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return "$false"
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case string:
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return parse.Quote(v)
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case int:
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return "(num " + strconv.Itoa(v) + ")"
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case *big.Int:
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return "(num " + v.String() + ")"
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case *big.Rat:
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return "(num " + v.String() + ")"
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case float64:
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return "(num " + formatFloat64(v) + ")"
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case Reprer:
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return v.Repr(indent)
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case File:
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return fmt.Sprintf("<file{%s %d}>", parse.Quote(v.Name()), v.Fd())
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case List:
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b := NewListReprBuilder(indent)
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for it := v.Iterator(); it.HasElem(); it.Next() {
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b.WriteElem(Repr(it.Elem(), indent+1))
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}
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return b.String()
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case Map:
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builder := NewMapReprBuilder(indent)
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for it := v.Iterator(); it.HasElem(); it.Next() {
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k, v := it.Elem()
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builder.WritePair(Repr(k, indent+1), indent+2, Repr(v, indent+2))
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}
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return builder.String()
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case StructMap:
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return reprStructMap(v, indent)
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case PseudoStructMap:
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return reprStructMap(v.Fields(), indent)
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default:
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return fmt.Sprintf("<unknown %v>", v)
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}
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}
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func reprStructMap(v StructMap, indent int) string {
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vValue := reflect.ValueOf(v)
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vType := vValue.Type()
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builder := NewMapReprBuilder(indent)
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it := iterateStructMap(vType)
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for it.Next() {
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k, v := it.Get(vValue)
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builder.WritePair(Repr(k, indent+1), indent+2, Repr(v, indent+2))
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}
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return builder.String()
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}
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