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package format
// field stores the minimum necessary
// data for iterating and formatting
// each field in a given struct.
type field struct {
format FormatFunc
name string
offset uintptr
}
// iterStructType returns a FormatFunc capable of iterating
// and formatting the given struct type currently in typenode{}.
// note this will fetch sub-FormatFuncs for each struct field.
func (fmt *Formatter) iterStructType(t typenode) FormatFunc {
// Number of struct fields.
n := t.rtype.NumField()
// Gather format functions.
fields := make([]field, n)
for i := 0; i < n; i++ {
// Get struct field at index.
sfield := t.rtype.Field(i)
rtype := sfield.Type
// Get nested field typenode with appropriate flags.
flags := reflect_struct_field_flags(t.flags, rtype)
ft := t.next(sfield.Type, flags)
// Get field format func.
fn := fmt.loadOrGet(ft)
if fn == nil {
panic("unreachable")
}
// Set field info.
fields[i] = field{
format: fn,
name: sfield.Name,
offset: sfield.Offset,
}
}
// Handle no. fields.
switch len(fields) {
case 0:
return emptyStructType(t)
case 1:
return iterSingleFieldStructType(t, fields[0])
default:
return iterMultiFieldStructType(t, fields)
}
}
func emptyStructType(t typenode) FormatFunc {
if !t.needs_typestr() {
return func(s *State) {
// Append empty object.
s.B = append(s.B, "{}"...)
}
}
// Struct type string with refs.
typestr := t.typestr_with_refs()
// Append empty object
// with type information.
return func(s *State) {
if s.A.WithType() {
s.B = append(s.B, typestr...)
}
s.B = append(s.B, "{}"...)
}
}
func iterSingleFieldStructType(t typenode, field field) FormatFunc {
if field.format == nil {
panic("nil func")
}
if !t.needs_typestr() {
return func(s *State) {
// Wrap 'fn' with braces + field name.
s.B = append(s.B, "{"+field.name+"="...)
field.format(s)
s.B = append(s.B, "}"...)
}
}
// Struct type string with refs.
typestr := t.typestr_with_refs()
return func(s *State) {
// Include type info.
if s.A.WithType() {
s.B = append(s.B, typestr...)
}
// Wrap 'fn' with braces + field name.
s.B = append(s.B, "{"+field.name+"="...)
field.format(s)
s.B = append(s.B, "}"...)
}
}
func iterMultiFieldStructType(t typenode, fields []field) FormatFunc {
for _, field := range fields {
if field.format == nil {
panic("nil func")
}
}
if !t.needs_typestr() {
return func(s *State) {
ptr := s.P
// Prepend object brace.
s.B = append(s.B, '{')
for i := 0; i < len(fields); i++ {
// Get struct field ptr via offset.
s.P = add(ptr, fields[i].offset)
// Append field name and value separator.
s.B = append(s.B, fields[i].name+"="...)
// Format i'th field.
fields[i].format(s)
s.B = append(s.B, ',', ' ')
}
// Drop final ", ".
s.B = s.B[:len(s.B)-2]
// Append object brace.
s.B = append(s.B, '}')
}
}
// Struct type string with refs.
typestr := t.typestr_with_refs()
return func(s *State) {
ptr := s.P
// Include type info.
if s.A.WithType() {
s.B = append(s.B, typestr...)
}
// Prepend object brace.
s.B = append(s.B, '{')
for i := 0; i < len(fields); i++ {
// Get struct field ptr via offset.
s.P = add(ptr, fields[i].offset)
// Append field name and value separator.
s.B = append(s.B, fields[i].name+"="...)
// Format i'th field.
fields[i].format(s)
s.B = append(s.B, ',', ' ')
}
// Drop final ", ".
s.B = s.B[:len(s.B)-2]
// Append object brace.
s.B = append(s.B, '}')
}
}
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