Method mapstruct

gen/unmarshal.go:293–387

(s *Struct)

}

func (u *unmarshalGen) mapstruct(s *Struct) {
	u.needsField()
	sz := randIdent()
	u.p.declare(sz, u32)
	u.assignMap(sz, mapHeader, 0)

	oeCount := s.CountFieldTagPart("omitempty") + s.CountFieldTagPart("omitzero")
	if !u.ctx.clearOmitted {
		oeCount = 0
	}
	bm := bmask{
		bitlen:  oeCount,
		varname: sz + "Mask",
	}
	if oeCount > 0 {
		// Declare mask
		u.p.printf("\n%s", bm.typeDecl())
		u.p.printf("\n_ = %s", bm.varname)
	}
	// Index to field idx of each emitted
	oeEmittedIdx := []int{}

	u.p.printf("\nfor %s > 0 {", sz)
	u.p.printf("\n%s--; field, bts, err = msgp.ReadMapKeyZC(bts)", sz)
	u.p.wrapErrCheck(u.ctx.ArgsStr())
	u.p.print("\nswitch msgp.UnsafeString(field) {")
	for i := range s.Fields {
		if !u.p.ok() {
			return
		}
		u.p.printf("\ncase %q:", s.Fields[i].FieldTag)
		u.ctx.PushString(s.Fields[i].FieldName)

		fieldElem := s.Fields[i].FieldElem
		anField := s.Fields[i].HasTagPart("allownil") && fieldElem.AllowNil()

		// Set field-specific limits in context based on struct field's FieldLimit
		if s.Fields[i].FieldLimit > 0 {
			// Apply same limit to both arrays and maps for this field
			u.ctx.SetFieldLimits(s.Fields[i].FieldLimit, s.Fields[i].FieldLimit)
		} else {
			u.ctx.ClearFieldLimits()
		}

		if anField {
			u.p.printf("\nif msgp.IsNil(bts) {\nbts = bts[1:]\n%s = nil\n} else {", fieldElem.Varname())
		}
		SetIsAllowNil(fieldElem, anField)
		if s.Fields[i].HasTagPart("zerocopy") {
			setRecursiveZC(fieldElem, true)
		}
		setTypeParams(fieldElem, s.typeParams)

		next(u, fieldElem)

		// Clear field limits after processing
		u.ctx.ClearFieldLimits()