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package gen
import (
"io"
"strconv"
)
func unmarshal(w io.Writer) *unmarshalGen {
return &unmarshalGen{
p: printer{w: w},
}
}
type unmarshalGen struct {
passes
p printer
hasfield bool
}
func (u *unmarshalGen) Method() Method { return Unmarshal }
func (u *unmarshalGen) needsField() {
if u.hasfield {
return
}
u.p.print("\nvar field []byte; _ = field")
u.hasfield = true
}
func (u *unmarshalGen) Execute(p Elem) error {
u.hasfield = false
if !u.p.ok() {
return u.p.err
}
if !IsPrintable(p) {
return nil
}
u.p.comment("UnmarshalMsg implements msgp.Unmarshaler")
u.p.printf("\nfunc (%s %s) UnmarshalMsg(bts []byte) (o []byte, err error) {", p.Varname(), methodReceiver(p))
next(u, p)
u.p.print("\no = bts")
u.p.nakedReturn()
unsetReceiver(p)
return u.p.err
}
// does assignment to the variable "name" with the type "base"
func (u *unmarshalGen) assignAndCheck(name string, base string) {
if !u.p.ok() {
return
}
u.p.printf("\n%s, bts, err = msgp.Read%sBytes(bts)", name, base)
u.p.print(errcheck)
}
func (u *unmarshalGen) gStruct(s *Struct) {
if !u.p.ok() {
return
}
if s.AsTuple {
u.tuple(s)
} else {
u.mapstruct(s)
}
return
}
func (u *unmarshalGen) tuple(s *Struct) {
// open block
u.p.print("\n{")
u.p.declare(structArraySizeVar, u32)
u.assignAndCheck(structArraySizeVar, arrayHeader)
u.p.arrayCheck(strconv.Itoa(len(s.Fields)), structArraySizeVar)
u.p.closeblock() // close 'ssz' block
for i := range s.Fields {
if !u.p.ok() {
return
}
next(u, s.Fields[i].FieldElem)
}
}
func (u *unmarshalGen) mapstruct(s *Struct) {
u.needsField()
u.p.declare(structMapSizeVar, u32)
u.assignAndCheck(structMapSizeVar, mapHeader)
u.p.print("\nfor isz > 0 {")
u.p.print("\nisz--; field, bts, err = msgp.ReadMapKeyZC(bts)")
u.p.print(errcheck)
u.p.print("\nswitch msgp.UnsafeString(field) {")
for i := range s.Fields {
if !u.p.ok() {
return
}
u.p.printf("\ncase \"%s\":", s.Fields[i].FieldTag)
next(u, s.Fields[i].FieldElem)
}
u.p.print("\ndefault:\nbts, err = msgp.Skip(bts)")
u.p.print(errcheck)
u.p.print("\n}\n}") // close switch and for loop
}
func (u *unmarshalGen) gBase(b *BaseElem) {
if !u.p.ok() {
return
}
refname := b.Varname() // assigned to
lowered := b.Varname() // passed as argument
if b.Convert {
// begin 'tmp' block
refname = "tmp"
lowered = b.ToBase() + "(" + lowered + ")"
u.p.printf("\n{\nvar tmp %s", b.BaseType())
}
switch b.Value {
case Bytes:
u.p.printf("\n%s, bts, err = msgp.ReadBytesBytes(bts, %s)", refname, lowered)
case Ext:
u.p.printf("\nbts, err = msgp.ReadExtensionBytes(bts, %s)", lowered)
case IDENT:
u.p.printf("\nbts, err = %s.UnmarshalMsg(bts)", lowered)
default:
u.p.printf("\n%s, bts, err = msgp.Read%sBytes(bts)", refname, b.BaseName())
}
if b.Convert {
// close 'tmp' block
u.p.printf("\n%s = %s(tmp)\n}", b.Varname(), b.FromBase())
}
u.p.print(errcheck)
}
func (u *unmarshalGen) gArray(a *Array) {
if !u.p.ok() {
return
}
// special case for [const]byte objects
// see decode.go for symmetry
if be, ok := a.Els.(*BaseElem); ok && be.Value == Byte {
u.p.printf("\nbts, err = msgp.ReadExactBytes(bts, %s[:])", a.Varname())
u.p.print(errcheck)
return
}
u.p.declare(arraySizeVar, u32)
u.assignAndCheck(arraySizeVar, arrayHeader)
u.p.arrayCheck(a.Size, arraySizeVar)
u.p.rangeBlock(a.Index, a.Varname(), u, a.Els)
}
func (u *unmarshalGen) gSlice(s *Slice) {
if !u.p.ok() {
return
}
u.p.declare(sliceSizeVar, u32)
u.assignAndCheck(sliceSizeVar, arrayHeader)
u.p.resizeSlice(sliceSizeVar, s)
u.p.rangeBlock(s.Index, s.Varname(), u, s.Els)
}
func (u *unmarshalGen) gMap(m *Map) {
if !u.p.ok() {
return
}
u.p.declare(mapSizeVar, u32)
u.assignAndCheck(mapSizeVar, mapHeader)
// allocate or clear map
u.p.resizeMap(mapSizeVar, m)
// loop and get key,value
u.p.print("\nfor msz > 0 {")
u.p.printf("\nvar %s string; var %s %s; msz--", m.Keyidx, m.Validx, m.Value.TypeName())
u.assignAndCheck(m.Keyidx, stringTyp)
next(u, m.Value)
u.p.mapAssign(m)
u.p.closeblock()
}
func (u *unmarshalGen) gPtr(p *Ptr) {
u.p.printf("\nif msgp.IsNil(bts) { bts, err = msgp.ReadNilBytes(bts); if err != nil { return }; %s = nil; } else { ", p.Varname())
u.p.initPtr(p)
next(u, p.Value)
u.p.closeblock()
}
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