forked from tinylib/msgp
/
marshal.go
143 lines (120 loc) · 2.64 KB
/
marshal.go
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package gen
import (
"fmt"
)
type marshalGen struct {
p printer
}
func (m *marshalGen) Execute(p Elem) error {
if !m.p.ok() {
return m.p.err
}
if !p.Printable() {
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(), methodReceiver(p))
m.p.printf("\no = msgp.Require(b, %s.Msgsize())", c)
next(m, p)
unsetReceiver(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) 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) {
m.rawAppend(arrayHeader, intFmt, len(s.Fields))
for i := range s.Fields {
if !m.p.ok() {
return
}
next(m, s.Fields[i].FieldElem)
}
}
func (m *marshalGen) mapstruct(s *Struct) {
m.rawAppend(mapHeader, intFmt, len(s.Fields))
for i := range s.Fields {
if !m.p.ok() {
return
}
m.rawAppend(stringTyp, quotedFmt, s.Fields[i].FieldTag)
next(m, s.Fields[i].FieldElem)
}
}
func (m *marshalGen) gMap(s *Map) {
if !m.p.ok() {
return
}
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
}
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
}
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.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
}
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)
}
}