/
genUnionReprKeyed.go
522 lines (489 loc) · 18.4 KB
/
genUnionReprKeyed.go
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package gengo
import (
"io"
"github.com/ipld/go-ipld-prime/schema"
"github.com/ipld/go-ipld-prime/schema/gen/go/mixins"
)
var _ TypeGenerator = &unionReprKeyedGenerator{}
// General observation: many things about the keyed representation of unions is *very* similar to the type-level code,
// because the type level code effective does espouse keyed-style behavior (just with type names as the keys).
// Be advised that this similarity does not hold at *all* true of any of the other representation modes of unions!
func NewUnionReprKeyedGenerator(pkgName string, typ *schema.TypeUnion, adjCfg *AdjunctCfg) TypeGenerator {
return unionReprKeyedGenerator{
unionGenerator{
adjCfg,
mixins.MapTraits{
PkgName: pkgName,
TypeName: string(typ.Name()),
TypeSymbol: adjCfg.TypeSymbol(typ),
},
pkgName,
typ,
},
}
}
type unionReprKeyedGenerator struct {
unionGenerator
}
func (g unionReprKeyedGenerator) GetRepresentationNodeGen() NodeGenerator {
return unionReprKeyedReprGenerator{
g.AdjCfg,
mixins.MapTraits{
PkgName: g.PkgName,
TypeName: string(g.Type.Name()) + ".Repr",
TypeSymbol: "_" + g.AdjCfg.TypeSymbol(g.Type) + "__Repr",
},
g.PkgName,
g.Type,
}
}
type unionReprKeyedReprGenerator struct {
AdjCfg *AdjunctCfg
mixins.MapTraits
PkgName string
Type *schema.TypeUnion
}
func (unionReprKeyedReprGenerator) IsRepr() bool { return true } // hint used in some generalized templates.
func (g unionReprKeyedReprGenerator) EmitNodeType(w io.Writer) {
// The type is structurally the same, but will have a different set of methods.
doTemplate(`
type _{{ .Type | TypeSymbol }}__Repr _{{ .Type | TypeSymbol }}
`, w, g.AdjCfg, g)
// We do also want some constants for our discriminant values;
// they'll make iterators able to work faster.
doTemplate(`
var (
{{- range $member := .Type.Members }}
memberName__{{ dot.Type | TypeSymbol }}_{{ $member.Name }}_serial = _String{"{{ $member | dot.Type.RepresentationStrategy.GetDiscriminant }}"}
{{- end }}
)
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprGenerator) EmitNodeTypeAssertions(w io.Writer) {
doTemplate(`
var _ datamodel.Node = &_{{ .Type | TypeSymbol }}__Repr{}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprGenerator) EmitNodeMethodLookupByString(w io.Writer) {
// Similar to the type-level method, except uses discriminant values as keys instead of the member type names.
doTemplate(`
func (n *_{{ .Type | TypeSymbol }}__Repr) LookupByString(key string) (datamodel.Node, error) {
switch key {
{{- range $i, $member := .Type.Members }}
case "{{ $member | dot.Type.RepresentationStrategy.GetDiscriminant }}":
{{- if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "embedAll") }}
if n.tag != {{ add $i 1 }} {
return nil, datamodel.ErrNotExists{Segment: datamodel.PathSegmentOfString(key)}
}
return n.x{{ add $i 1 }}.Representation(), nil
{{- else if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "interface") }}
if n2, ok := n.x.({{ $member | TypeSymbol }}); ok {
return n2.Representation(), nil
} else {
return nil, datamodel.ErrNotExists{Segment: datamodel.PathSegmentOfString(key)}
}
{{- end}}
{{- end}}
default:
return nil, schema.ErrNoSuchField{Type: nil /*TODO*/, Field: datamodel.PathSegmentOfString(key)}
}
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprGenerator) EmitNodeMethodLookupByNode(w io.Writer) {
doTemplate(`
func (n *_{{ .Type | TypeSymbol }}__Repr) LookupByNode(key datamodel.Node) (datamodel.Node, error) {
ks, err := key.AsString()
if err != nil {
return nil, err
}
return n.LookupByString(ks)
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprGenerator) EmitNodeMethodMapIterator(w io.Writer) {
// Similar to the type-level method, except yields discriminant values as keys instead of the member type names.
doTemplate(`
func (n *_{{ .Type | TypeSymbol }}__Repr) MapIterator() datamodel.MapIterator {
return &_{{ .Type | TypeSymbol }}__ReprMapItr{n, false}
}
type _{{ .Type | TypeSymbol }}__ReprMapItr struct {
n *_{{ .Type | TypeSymbol }}__Repr
done bool
}
func (itr *_{{ .Type | TypeSymbol }}__ReprMapItr) Next() (k datamodel.Node, v datamodel.Node, _ error) {
if itr.done {
return nil, nil, datamodel.ErrIteratorOverread{}
}
{{- if (eq (.AdjCfg.UnionMemlayout .Type) "embedAll") }}
switch itr.n.tag {
{{- range $i, $member := .Type.Members }}
case {{ add $i 1 }}:
k, v = &memberName__{{ dot.Type | TypeSymbol }}_{{ $member.Name }}_serial, itr.n.x{{ add $i 1 }}.Representation()
{{- end}}
{{- else if (eq (.AdjCfg.UnionMemlayout .Type) "interface") }}
switch n2 := itr.n.x.(type) {
{{- range $member := .Type.Members }}
case {{ $member | TypeSymbol }}:
k, v = &memberName__{{ dot.Type | TypeSymbol }}_{{ $member.Name }}_serial, n2.Representation()
{{- end}}
{{- end}}
default:
panic("unreachable")
}
itr.done = true
return
}
func (itr *_{{ .Type | TypeSymbol }}__ReprMapItr) Done() bool {
return itr.done
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprGenerator) EmitNodeMethodLength(w io.Writer) {
doTemplate(`
func (_{{ .Type | TypeSymbol }}__Repr) Length() int64 {
return 1
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprGenerator) EmitNodeMethodPrototype(w io.Writer) {
emitNodeMethodPrototype_typical(w, g.AdjCfg, g)
}
func (g unionReprKeyedReprGenerator) EmitNodePrototypeType(w io.Writer) {
emitNodePrototypeType_typical(w, g.AdjCfg, g)
}
// --- NodeBuilder and NodeAssembler --->
func (g unionReprKeyedReprGenerator) GetNodeBuilderGenerator() NodeBuilderGenerator {
return unionReprKeyedReprBuilderGenerator{
g.AdjCfg,
mixins.MapAssemblerTraits{
PkgName: g.PkgName,
TypeName: g.TypeName,
AppliedPrefix: "_" + g.AdjCfg.TypeSymbol(g.Type) + "__Repr",
},
g.PkgName,
g.Type,
}
}
type unionReprKeyedReprBuilderGenerator struct {
AdjCfg *AdjunctCfg
mixins.MapAssemblerTraits
PkgName string
Type *schema.TypeUnion
}
func (unionReprKeyedReprBuilderGenerator) IsRepr() bool { return true } // hint used in some generalized templates.
func (g unionReprKeyedReprBuilderGenerator) EmitNodeBuilderType(w io.Writer) {
emitEmitNodeBuilderType_typical(w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) EmitNodeBuilderMethods(w io.Writer) {
emitNodeBuilderMethods_typical(w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) EmitNodeAssemblerType(w io.Writer) {
// Nearly identical to the type-level system, except it embeds the Repr variant of child assemblers
// (which is a very minor difference textually, but means this structure can end up with a pretty wildly different resident memory size than the type-level one).
doTemplate(`
type _{{ .Type | TypeSymbol }}__ReprAssembler struct {
w *_{{ .Type | TypeSymbol }}
m *schema.Maybe
state maState
cm schema.Maybe
{{- range $i, $member := .Type.Members }}
ca{{ add $i 1 }} {{ if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "interface") }}*{{end}}_{{ $member | TypeSymbol }}__ReprAssembler
{{end -}}
ca uint
}
`, w, g.AdjCfg, g)
// Reset methods: also nearly identical to the type-level ones.
doTemplate(`
func (na *_{{ .Type | TypeSymbol }}__ReprAssembler) reset() {
na.state = maState_initial
switch na.ca {
case 0:
return
{{- range $i, $member := .Type.Members }}
case {{ add $i 1 }}:
na.ca{{ add $i 1 }}.reset()
{{end -}}
default:
panic("unreachable")
}
na.ca = 0
na.cm = schema.Maybe_Absent
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) EmitNodeAssemblerMethodBeginMap(w io.Writer) {
emitNodeAssemblerMethodBeginMap_strictoid(w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) EmitNodeAssemblerMethodAssignNull(w io.Writer) {
// It might sound a bit odd to call a union "recursive", since it's so very trivially so (no fan-out),
// but it's functionally accurate: the generated method should include a branch for the 'midvalue' state.
emitNodeAssemblerMethodAssignNull_recursive(w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) EmitNodeAssemblerMethodAssignNode(w io.Writer) {
// DRY: this is once again not-coincidentally very nearly equal to the type-level method. Would be good to dedup them... after we do the get-to-the-point-in-phase-3 improvement.
doTemplate(`
func (na *_{{ .Type | TypeSymbol }}__ReprAssembler) AssignNode(v datamodel.Node) error {
if v.IsNull() {
return na.AssignNull()
}
if v2, ok := v.(*_{{ .Type | TypeSymbol }}); ok {
switch *na.m {
case schema.Maybe_Value, schema.Maybe_Null:
panic("invalid state: cannot assign into assembler that's already finished")
case midvalue:
panic("invalid state: cannot assign null into an assembler that's already begun working on recursive structures!")
}
{{- if .Type | MaybeUsesPtr }}
if na.w == nil {
na.w = v2
*na.m = schema.Maybe_Value
return nil
}
{{- end}}
*na.w = *v2
*na.m = schema.Maybe_Value
return nil
}
if v.Kind() != datamodel.Kind_Map {
return datamodel.ErrWrongKind{TypeName: "{{ .PkgName }}.{{ .Type.Name }}.Repr", MethodName: "AssignNode", AppropriateKind: datamodel.KindSet_JustMap, ActualKind: v.Kind()}
}
itr := v.MapIterator()
for !itr.Done() {
k, v, err := itr.Next()
if err != nil {
return err
}
if err := na.AssembleKey().AssignNode(k); err != nil {
return err
}
if err := na.AssembleValue().AssignNode(v); err != nil {
return err
}
}
return na.Finish()
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) EmitNodeAssemblerOtherBits(w io.Writer) {
g.emitMapAssemblerChildTidyHelper(w)
g.emitMapAssemblerMethods(w)
g.emitKeyAssembler(w)
}
func (g unionReprKeyedReprBuilderGenerator) emitMapAssemblerChildTidyHelper(w io.Writer) {
// Nearly identical to the type-level equivalent.
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__ReprAssembler) valueFinishTidy() bool {
switch ma.cm {
case schema.Maybe_Value:
{{- /* nothing to do for memlayout=embedAll; the tag is already set and memory already in place. */ -}}
{{- /* nothing to do for memlayout=interface either; same story, the values are already in place. */ -}}
ma.state = maState_initial
return true
default:
return false
}
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) emitMapAssemblerMethods(w io.Writer) {
// All of these: shamelessly similar to the type-level equivalent, modulo a few appearances of "Repr".
// Alright, and also the "discriminant values as keys instead of the member type names" thing.
// DRY: the number of times these `ma.state` switches are appearing is truly intense! This is starting to look like one of them most important things to shrink the GSLOC/ASM size of!
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__ReprAssembler) AssembleEntry(k string) (datamodel.NodeAssembler, error) {
switch ma.state {
case maState_initial:
// carry on
case maState_midKey:
panic("invalid state: AssembleEntry cannot be called when in the middle of assembling another key")
case maState_expectValue:
panic("invalid state: AssembleEntry cannot be called when expecting start of value assembly")
case maState_midValue:
if !ma.valueFinishTidy() {
panic("invalid state: AssembleEntry cannot be called when in the middle of assembling a value")
} // if tidy success: carry on for the moment, but we'll still be erroring shortly.
case maState_finished:
panic("invalid state: AssembleEntry cannot be called on an assembler that's already finished")
}
if ma.ca != 0 {
return nil, schema.ErrNotUnionStructure{TypeName:"{{ .PkgName }}.{{ .Type.Name }}.Repr", Detail: "cannot add another entry -- a union can only contain one thing!"}
}
{{- if .Type.Members }}
switch k {
{{- range $i, $member := .Type.Members }}
case "{{ $member | dot.Type.RepresentationStrategy.GetDiscriminant }}":
ma.state = maState_midValue
ma.ca = {{ add $i 1 }}
{{- if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "embedAll") }}
ma.w.tag = {{ add $i 1 }}
ma.ca{{ add $i 1 }}.w = &ma.w.x{{ add $i 1 }}
ma.ca{{ add $i 1 }}.m = &ma.cm
return &ma.ca{{ add $i 1 }}, nil
{{- else if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "interface") }}
x := &_{{ $member | TypeSymbol }}{}
ma.w.x = x
if ma.ca{{ add $i 1 }} == nil {
ma.ca{{ add $i 1 }} = &_{{ $member | TypeSymbol }}__ReprAssembler{}
}
ma.ca{{ add $i 1 }}.w = x
ma.ca{{ add $i 1 }}.m = &ma.cm
return ma.ca{{ add $i 1 }}, nil
{{- end}}
{{- end}}
}
{{- end}}
return nil, schema.ErrInvalidKey{TypeName:"{{ .PkgName }}.{{ .Type.Name }}.Repr", Key:&_String{k}}
}
`, w, g.AdjCfg, g)
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__ReprAssembler) AssembleKey() datamodel.NodeAssembler {
switch ma.state {
case maState_initial:
// carry on
case maState_midKey:
panic("invalid state: AssembleKey cannot be called when in the middle of assembling another key")
case maState_expectValue:
panic("invalid state: AssembleKey cannot be called when expecting start of value assembly")
case maState_midValue:
if !ma.valueFinishTidy() {
panic("invalid state: AssembleKey cannot be called when in the middle of assembling a value")
} // if tidy success: carry on for the moment, but we'll still be erroring shortly... or rather, the keyassembler will be.
case maState_finished:
panic("invalid state: AssembleKey cannot be called on an assembler that's already finished")
}
ma.state = maState_midKey
return (*_{{ .Type | TypeSymbol }}__ReprKeyAssembler)(ma)
}
`, w, g.AdjCfg, g)
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__ReprAssembler) AssembleValue() datamodel.NodeAssembler {
switch ma.state {
case maState_initial:
panic("invalid state: AssembleValue cannot be called when no key is primed")
case maState_midKey:
panic("invalid state: AssembleValue cannot be called when in the middle of assembling a key")
case maState_expectValue:
// carry on
case maState_midValue:
panic("invalid state: AssembleValue cannot be called when in the middle of assembling another value")
case maState_finished:
panic("invalid state: AssembleValue cannot be called on an assembler that's already finished")
}
ma.state = maState_midValue
switch ma.ca {
{{- range $i, $member := .Type.Members }}
case {{ add $i 1 }}:
{{- if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "embedAll") }}
ma.ca{{ add $i 1 }}.w = &ma.w.x{{ add $i 1 }}
ma.ca{{ add $i 1 }}.m = &ma.cm
return &ma.ca{{ add $i 1 }}
{{- else if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "interface") }}
x := &_{{ $member | TypeSymbol }}{}
ma.w.x = x
if ma.ca{{ add $i 1 }} == nil {
ma.ca{{ add $i 1 }} = &_{{ $member | TypeSymbol }}__ReprAssembler{}
}
ma.ca{{ add $i 1 }}.w = x
ma.ca{{ add $i 1 }}.m = &ma.cm
return ma.ca{{ add $i 1 }}
{{- end}}
{{- end}}
default:
panic("unreachable")
}
}
`, w, g.AdjCfg, g)
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__ReprAssembler) Finish() error {
switch ma.state {
case maState_initial:
// carry on
case maState_midKey:
panic("invalid state: Finish cannot be called when in the middle of assembling a key")
case maState_expectValue:
panic("invalid state: Finish cannot be called when expecting start of value assembly")
case maState_midValue:
if !ma.valueFinishTidy() {
panic("invalid state: Finish cannot be called when in the middle of assembling a value")
} // if tidy success: carry on
case maState_finished:
panic("invalid state: Finish cannot be called on an assembler that's already finished")
}
if ma.ca == 0 {
return schema.ErrNotUnionStructure{TypeName:"{{ .PkgName }}.{{ .Type.Name }}.Repr", Detail: "a union must have exactly one entry (not none)!"}
}
ma.state = maState_finished
*ma.m = schema.Maybe_Value
return nil
}
`, w, g.AdjCfg, g)
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__ReprAssembler) KeyPrototype() datamodel.NodePrototype {
return _String__Prototype{}
}
func (ma *_{{ .Type | TypeSymbol }}__ReprAssembler) ValuePrototype(k string) datamodel.NodePrototype {
switch k {
{{- range $i, $member := .Type.Members }}
case "{{ $member.Name }}":
return _{{ $member | TypeSymbol }}__ReprPrototype{}
{{- end}}
default:
return nil
}
}
`, w, g.AdjCfg, g)
}
func (g unionReprKeyedReprBuilderGenerator) emitKeyAssembler(w io.Writer) {
doTemplate(`
type _{{ .Type | TypeSymbol }}__ReprKeyAssembler _{{ .Type | TypeSymbol }}__ReprAssembler
`, w, g.AdjCfg, g)
stubs := mixins.StringAssemblerTraits{
PkgName: g.PkgName,
TypeName: g.TypeName + ".KeyAssembler", // ".Repr" is already in `g.TypeName`, so don't stutter the "Repr" part.
AppliedPrefix: "_" + g.AdjCfg.TypeSymbol(g.Type) + "__ReprKey",
}
// This key assembler can disregard any idea of complex keys because we know that our discriminants are just strings!
stubs.EmitNodeAssemblerMethodBeginMap(w)
stubs.EmitNodeAssemblerMethodBeginList(w)
stubs.EmitNodeAssemblerMethodAssignNull(w)
stubs.EmitNodeAssemblerMethodAssignBool(w)
stubs.EmitNodeAssemblerMethodAssignInt(w)
stubs.EmitNodeAssemblerMethodAssignFloat(w)
doTemplate(`
func (ka *_{{ .Type | TypeSymbol }}__ReprKeyAssembler) AssignString(k string) error {
if ka.state != maState_midKey {
panic("misuse: KeyAssembler held beyond its valid lifetime")
}
if ka.ca != 0 {
return schema.ErrNotUnionStructure{TypeName:"{{ .PkgName }}.{{ .Type.Name }}.Repr", Detail: "cannot add another entry -- a union can only contain one thing!"}
}
switch k {
{{- range $i, $member := .Type.Members }}
case "{{ $member | dot.Type.RepresentationStrategy.GetDiscriminant }}":
ka.ca = {{ add $i 1 }}
{{- if (eq (dot.AdjCfg.UnionMemlayout dot.Type) "embedAll") }}
ka.w.tag = {{ add $i 1 }}
{{- end}}
ka.state = maState_expectValue
return nil
{{- end}}
}
return schema.ErrInvalidKey{TypeName:"{{ .PkgName }}.{{ .Type.Name }}.Repr", Key:&_String{k}} // TODO: error quality: ErrInvalidUnionDiscriminant ?
}
`, w, g.AdjCfg, g)
stubs.EmitNodeAssemblerMethodAssignBytes(w)
stubs.EmitNodeAssemblerMethodAssignLink(w)
doTemplate(`
func (ka *_{{ .Type | TypeSymbol }}__ReprKeyAssembler) AssignNode(v datamodel.Node) error {
if v2, err := v.AsString(); err != nil {
return err
} else {
return ka.AssignString(v2)
}
}
func (_{{ .Type | TypeSymbol }}__ReprKeyAssembler) Prototype() datamodel.NodePrototype {
return _String__Prototype{}
}
`, w, g.AdjCfg, g)
}