mirror of
https://github.com/go-sylixos/elvish.git
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bd1a6e98dc
* Fields may now be exposed via getter methods. * Field names are automatically converted to dashed-case. * Assoc behavior is no longer implemented for structmaps. * The IsStructMap marker method no longer takes a special marker argument. There is a little danger of a value accidentally implementing this method.
78 lines
2.3 KiB
Go
78 lines
2.3 KiB
Go
package vals
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import (
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"fmt"
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"reflect"
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"github.com/elves/elvish/pkg/parse"
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"github.com/elves/elvish/pkg/util"
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)
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// NoPretty can be passed to Repr to suppress pretty-printing.
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const NoPretty = util.MinInt
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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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// Repr returns the representation for a value, a string that is preferably (but
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// not necessarily) an Elvish expression that evaluates to the argument. If
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// indent >= 0, the representation is pretty-printed. It is implemented for the
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// builtin types nil, bool and string, the File, List and Map types, StructMap
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// types, and types satisfying the Reprer interface. For other types, it uses
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// fmt.Sprint with the format "<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 float64:
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return "(float64 " + formatFloat64(v) + ")"
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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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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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case Reprer:
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return v.Repr(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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