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|
package gen
import (
"fmt"
"github.com/tinylib/msgp/msgp"
"io"
)
func marshal(w io.Writer) *marshalGen {
return &marshalGen{
p: printer{w: w},
}
}
type marshalGen struct {
passes
p printer
fuse []byte
}
func (m *marshalGen) Method() Method { return Marshal }
func (m *marshalGen) Apply(dirs []string) error {
return nil
}
func (m *marshalGen) Execute(p Elem) error {
if !m.p.ok() {
return m.p.err
}
p = m.applyall(p)
if p == nil {
return nil
}
if !IsPrintable(p) {
return nil
}
m.p.comment("MarshalMsg implements msgp.Marshaler")
// save the vname before
// calling methodReceiver so
// that z.Msgsize() is printed correctly
c := p.Varname()
m.p.printf("\nfunc (%s %s) MarshalMsg(b []byte) (o []byte, err error) {", p.Varname(), imutMethodReceiver(p))
m.p.printf("\no = msgp.Require(b, %s.Msgsize())", c)
next(m, p)
m.p.nakedReturn()
return m.p.err
}
func (m *marshalGen) rawAppend(typ string, argfmt string, arg interface{}) {
m.p.printf("\no = msgp.Append%s(o, %s)", typ, fmt.Sprintf(argfmt, arg))
}
func (m *marshalGen) fuseHook() {
if len(m.fuse) > 0 {
m.rawbytes(m.fuse)
m.fuse = m.fuse[:0]
}
}
func (m *marshalGen) Fuse(b []byte) {
if len(m.fuse) == 0 {
m.fuse = b
} else {
m.fuse = append(m.fuse, b...)
}
}
func (m *marshalGen) gStruct(s *Struct) {
if !m.p.ok() {
return
}
if s.AsTuple {
m.tuple(s)
} else {
m.mapstruct(s)
}
return
}
func (m *marshalGen) tuple(s *Struct) {
data := make([]byte, 0, 5)
data = msgp.AppendArrayHeader(data, uint32(len(s.Fields)))
m.p.printf("\n// array header, size %d", len(s.Fields))
m.Fuse(data)
for i := range s.Fields {
if !m.p.ok() {
return
}
next(m, s.Fields[i].FieldElem)
}
}
func (m *marshalGen) mapstruct(s *Struct) {
data := make([]byte, 0, 64)
data = msgp.AppendMapHeader(data, uint32(len(s.Fields)))
m.p.printf("\n// map header, size %d", len(s.Fields))
m.Fuse(data)
for i := range s.Fields {
if !m.p.ok() {
return
}
data = msgp.AppendString(nil, s.Fields[i].FieldTag)
m.p.printf("\n// string %q", s.Fields[i].FieldTag)
m.Fuse(data)
next(m, s.Fields[i].FieldElem)
}
}
// append raw data
func (m *marshalGen) rawbytes(bts []byte) {
m.p.print("\no = append(o, ")
for _, b := range bts {
m.p.printf("0x%x,", b)
}
m.p.print(")")
}
func (m *marshalGen) gMap(s *Map) {
if !m.p.ok() {
return
}
m.fuseHook()
vname := s.Varname()
m.rawAppend(mapHeader, lenAsUint32, vname)
m.p.printf("\nfor %s, %s := range %s {", s.Keyidx, s.Validx, vname)
m.rawAppend(stringTyp, literalFmt, s.Keyidx)
next(m, s.Value)
m.p.closeblock()
}
func (m *marshalGen) gSlice(s *Slice) {
if !m.p.ok() {
return
}
m.fuseHook()
vname := s.Varname()
m.rawAppend(arrayHeader, lenAsUint32, vname)
m.p.rangeBlock(s.Index, vname, m, s.Els)
}
func (m *marshalGen) gArray(a *Array) {
if !m.p.ok() {
return
}
m.fuseHook()
if be, ok := a.Els.(*BaseElem); ok && be.Value == Byte {
m.rawAppend("Bytes", "%s[:]", a.Varname())
return
}
m.rawAppend(arrayHeader, literalFmt, a.Size)
m.p.rangeBlock(a.Index, a.Varname(), m, a.Els)
}
func (m *marshalGen) gPtr(p *Ptr) {
if !m.p.ok() {
return
}
m.fuseHook()
m.p.printf("\nif %s == nil {\no = msgp.AppendNil(o)\n} else {", p.Varname())
next(m, p.Value)
m.p.closeblock()
}
func (m *marshalGen) gBase(b *BaseElem) {
if !m.p.ok() {
return
}
m.fuseHook()
vname := b.Varname()
if b.Convert {
vname = tobaseConvert(b)
}
var echeck bool
switch b.Value {
case IDENT:
echeck = true
m.p.printf("\no, err = %s.MarshalMsg(o)", vname)
case Intf, Ext:
echeck = true
m.p.printf("\no, err = msgp.Append%s(o, %s)", b.BaseName(), vname)
default:
m.rawAppend(b.BaseName(), literalFmt, vname)
}
if echeck {
m.p.print(errcheck)
}
}
|
