89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
package awsutil
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import (
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"bytes"
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"fmt"
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"reflect"
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"strings"
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)
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// StringValue returns the string representation of a value.
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func StringValue(i interface{}) string {
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var buf bytes.Buffer
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stringValue(reflect.ValueOf(i), 0, &buf)
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return buf.String()
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}
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func stringValue(v reflect.Value, indent int, buf *bytes.Buffer) {
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for v.Kind() == reflect.Ptr {
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v = v.Elem()
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}
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switch v.Kind() {
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case reflect.Struct:
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buf.WriteString("{\n")
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names := []string{}
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for i := 0; i < v.Type().NumField(); i++ {
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name := v.Type().Field(i).Name
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f := v.Field(i)
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if name[0:1] == strings.ToLower(name[0:1]) {
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continue // ignore unexported fields
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}
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if (f.Kind() == reflect.Ptr || f.Kind() == reflect.Slice) && f.IsNil() {
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continue // ignore unset fields
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}
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names = append(names, name)
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}
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for i, n := range names {
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val := v.FieldByName(n)
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buf.WriteString(strings.Repeat(" ", indent+2))
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buf.WriteString(n + ": ")
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stringValue(val, indent+2, buf)
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if i < len(names)-1 {
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buf.WriteString(",\n")
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}
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}
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buf.WriteString("\n" + strings.Repeat(" ", indent) + "}")
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case reflect.Slice:
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nl, id, id2 := "", "", ""
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if v.Len() > 3 {
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nl, id, id2 = "\n", strings.Repeat(" ", indent), strings.Repeat(" ", indent+2)
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}
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buf.WriteString("[" + nl)
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for i := 0; i < v.Len(); i++ {
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buf.WriteString(id2)
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stringValue(v.Index(i), indent+2, buf)
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if i < v.Len()-1 {
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buf.WriteString("," + nl)
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}
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}
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buf.WriteString(nl + id + "]")
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case reflect.Map:
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buf.WriteString("{\n")
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for i, k := range v.MapKeys() {
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buf.WriteString(strings.Repeat(" ", indent+2))
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buf.WriteString(k.String() + ": ")
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stringValue(v.MapIndex(k), indent+2, buf)
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if i < v.Len()-1 {
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buf.WriteString(",\n")
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}
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}
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buf.WriteString("\n" + strings.Repeat(" ", indent) + "}")
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default:
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format := "%v"
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switch v.Interface().(type) {
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case string:
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format = "%q"
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}
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fmt.Fprintf(buf, format, v.Interface())
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}
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}
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