/
genStruct.go
594 lines (560 loc) · 21.2 KB
/
genStruct.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"
)
type structGenerator struct {
AdjCfg *AdjunctCfg
mixins.MapTraits
PkgName string
Type *schema.TypeStruct
}
func (structGenerator) IsRepr() bool { return false } // hint used in some generalized templates.
// --- native content and specializations --->
func (g structGenerator) EmitNativeType(w io.Writer) {
doTemplate(`
{{- if Comments -}}
// {{ .Type | TypeSymbol }} matches the IPLD Schema type "{{ .Type.Name }}". It has {{ .Type.TypeKind }} type-kind, and may be interrogated like {{ .Kind }} kind.
{{- end}}
type {{ .Type | TypeSymbol }} = *_{{ .Type | TypeSymbol }}
type _{{ .Type | TypeSymbol }} struct {
{{- range $field := .Type.Fields}}
{{ $field | FieldSymbolLower }} _{{ $field.Type | TypeSymbol }}{{if $field.IsMaybe }}__Maybe{{end}}
{{- end}}
}
`, w, g.AdjCfg, g)
}
func (g structGenerator) EmitNativeAccessors(w io.Writer) {
doTemplate(`
{{- $type := .Type -}} {{- /* ranging modifies dot, unhelpfully */ -}}
{{- range $field := .Type.Fields }}
func (n _{{ $type | TypeSymbol }}) Field{{ $field | FieldSymbolUpper }}() {{ if $field.IsMaybe }}Maybe{{end}}{{ $field.Type | TypeSymbol }} {
return &n.{{ $field | FieldSymbolLower }}
}
{{- end}}
`, w, g.AdjCfg, g)
}
func (g structGenerator) EmitNativeBuilder(w io.Writer) {
// Unclear what, if anything, goes here.
}
func (g structGenerator) EmitNativeMaybe(w io.Writer) {
emitNativeMaybe(w, g.AdjCfg, g)
}
// --- type info --->
func (g structGenerator) EmitTypeConst(w io.Writer) {
doTemplate(`
// TODO EmitTypeConst
`, w, g.AdjCfg, g)
}
// --- TypedNode interface satisfaction --->
func (g structGenerator) EmitTypedNodeMethodType(w io.Writer) {
doTemplate(`
func ({{ .Type | TypeSymbol }}) Type() schema.Type {
return nil /*TODO:typelit*/
}
`, w, g.AdjCfg, g)
}
func (g structGenerator) EmitTypedNodeMethodRepresentation(w io.Writer) {
emitTypicalTypedNodeMethodRepresentation(w, g.AdjCfg, g)
}
// --- Node interface satisfaction --->
func (g structGenerator) EmitNodeType(w io.Writer) {
// No additional types needed. Methods all attach to the native type.
// We do, however, want some constants for our fields;
// they'll make iterators able to work faster. So let's emit those.
doTemplate(`
var (
{{- $type := .Type -}} {{- /* ranging modifies dot, unhelpfully */ -}}
{{- range $field := .Type.Fields }}
fieldName__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }} = _String{"{{ $field.Name }}"}
{{- end }}
)
`, w, g.AdjCfg, g)
}
func (g structGenerator) EmitNodeTypeAssertions(w io.Writer) {
emitNodeTypeAssertions_typical(w, g.AdjCfg, g)
}
func (g structGenerator) EmitNodeMethodLookupByString(w io.Writer) {
doTemplate(`
func (n {{ .Type | TypeSymbol }}) LookupByString(key string) (datamodel.Node, error) {
switch key {
{{- range $field := .Type.Fields }}
case "{{ $field.Name }}":
{{- if $field.IsOptional }}
if n.{{ $field | FieldSymbolLower }}.m == schema.Maybe_Absent {
return datamodel.Absent, nil
}
{{- end}}
{{- if $field.IsNullable }}
if n.{{ $field | FieldSymbolLower }}.m == schema.Maybe_Null {
return datamodel.Null, nil
}
{{- end}}
{{- if $field.IsMaybe }}
return {{if not (MaybeUsesPtr $field.Type) }}&{{end}}n.{{ $field | FieldSymbolLower }}.v, nil
{{- else}}
return &n.{{ $field | FieldSymbolLower }}, nil
{{- end}}
{{- end}}
default:
return nil, schema.ErrNoSuchField{Type: nil /*TODO*/, Field: datamodel.PathSegmentOfString(key)}
}
}
`, w, g.AdjCfg, g)
}
func (g structGenerator) EmitNodeMethodLookupByNode(w io.Writer) {
doTemplate(`
func (n {{ .Type | TypeSymbol }}) 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 structGenerator) EmitNodeMethodMapIterator(w io.Writer) {
// Note that the typed iterator will report absent fields.
// The representation iterator (if has one) however will skip those.
doTemplate(`
func (n {{ .Type | TypeSymbol }}) MapIterator() datamodel.MapIterator {
return &_{{ .Type | TypeSymbol }}__MapItr{n, 0}
}
type _{{ .Type | TypeSymbol }}__MapItr struct {
n {{ .Type | TypeSymbol }}
idx int
}
func (itr *_{{ .Type | TypeSymbol }}__MapItr) Next() (k datamodel.Node, v datamodel.Node, _ error) {
{{- if not .Type.Fields }}
return nil, nil, datamodel.ErrIteratorOverread{}
{{ else -}}
if itr.idx >= {{ len .Type.Fields }} {
return nil, nil, datamodel.ErrIteratorOverread{}
}
switch itr.idx {
{{- $type := .Type -}} {{- /* ranging modifies dot, unhelpfully */ -}}
{{- range $i, $field := .Type.Fields }}
case {{ $i }}:
k = &fieldName__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }}
{{- if $field.IsOptional }}
if itr.n.{{ $field | FieldSymbolLower }}.m == schema.Maybe_Absent {
v = datamodel.Absent
break
}
{{- end}}
{{- if $field.IsNullable }}
if itr.n.{{ $field | FieldSymbolLower }}.m == schema.Maybe_Null {
v = datamodel.Null
break
}
{{- end}}
{{- if $field.IsMaybe }}
v = {{if not (MaybeUsesPtr $field.Type) }}&{{end}}itr.n.{{ $field | FieldSymbolLower}}.v
{{- else}}
v = &itr.n.{{ $field | FieldSymbolLower}}
{{- end}}
{{- end}}
default:
panic("unreachable")
}
itr.idx++
return
{{- end}}
}
func (itr *_{{ .Type | TypeSymbol }}__MapItr) Done() bool {
return itr.idx >= {{ len .Type.Fields }}
}
`, w, g.AdjCfg, g)
}
func (g structGenerator) EmitNodeMethodLength(w io.Writer) {
doTemplate(`
func ({{ .Type | TypeSymbol }}) Length() int64 {
return {{ len .Type.Fields }}
}
`, w, g.AdjCfg, g)
}
func (g structGenerator) EmitNodeMethodPrototype(w io.Writer) {
emitNodeMethodPrototype_typical(w, g.AdjCfg, g)
}
func (g structGenerator) EmitNodePrototypeType(w io.Writer) {
emitNodePrototypeType_typical(w, g.AdjCfg, g)
}
// --- NodeBuilder and NodeAssembler --->
func (g structGenerator) GetNodeBuilderGenerator() NodeBuilderGenerator {
return structBuilderGenerator{
g.AdjCfg,
mixins.MapAssemblerTraits{
PkgName: g.PkgName,
TypeName: g.TypeName,
AppliedPrefix: "_" + g.AdjCfg.TypeSymbol(g.Type) + "__",
},
g.PkgName,
g.Type,
}
}
type structBuilderGenerator struct {
AdjCfg *AdjunctCfg
mixins.MapAssemblerTraits
PkgName string
Type *schema.TypeStruct
}
func (structBuilderGenerator) IsRepr() bool { return false } // hint used in some generalized templates.
func (g structBuilderGenerator) EmitNodeBuilderType(w io.Writer) {
emitEmitNodeBuilderType_typical(w, g.AdjCfg, g)
}
func (g structBuilderGenerator) EmitNodeBuilderMethods(w io.Writer) {
emitNodeBuilderMethods_typical(w, g.AdjCfg, g)
}
func (g structBuilderGenerator) EmitNodeAssemblerType(w io.Writer) {
// - 'w' is the "**w**ip" pointer.
// - 'm' is the **m**aybe which communicates our completeness to the parent if we're a child assembler.
// - 'state' is what it says on the tin. this is used for the map state (the broad transitions between null, start-map, and finish are handled by 'm' for consistency.)
// - 's' is a bitfield for what's been **s**et.
// - 'f' is the **f**ocused field that will be assembled next.
//
// - 'cm' is **c**hild **m**aybe and is used for the completion message from children that aren't allowed to be nullable (for those that are, their own maybe.m is used).
// ('cm' could be elided for structs where all fields are maybes. trivial but not yet implemented.)
// - the 'ca_*' fields embed **c**hild **a**ssemblers -- these are embedded so we can yield pointers to them without causing new allocations.
doTemplate(`
type _{{ .Type | TypeSymbol }}__Assembler struct {
w *_{{ .Type | TypeSymbol }}
m *schema.Maybe
state maState
s int
f int
cm schema.Maybe
{{range $field := .Type.Fields -}}
ca_{{ $field | FieldSymbolLower }} _{{ $field.Type | TypeSymbol }}__Assembler
{{end -}}
}
func (na *_{{ .Type | TypeSymbol }}__Assembler) reset() {
na.state = maState_initial
na.s = 0
{{- range $field := .Type.Fields }}
na.ca_{{ $field | FieldSymbolLower }}.reset()
{{- end}}
}
var (
{{- $type := .Type -}} {{- /* ranging modifies dot, unhelpfully */ -}}
{{- range $i, $field := .Type.Fields }}
fieldBit__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }} = 1 << {{ $i }}
{{- end}}
fieldBits__{{ $type | TypeSymbol }}_sufficient = 0 {{- range $i, $field := .Type.Fields }}{{if not $field.IsOptional }} + 1 << {{ $i }}{{end}}{{end}}
)
`, w, g.AdjCfg, g)
}
func (g structBuilderGenerator) EmitNodeAssemblerMethodBeginMap(w io.Writer) {
emitNodeAssemblerMethodBeginMap_strictoid(w, g.AdjCfg, g)
}
func (g structBuilderGenerator) EmitNodeAssemblerMethodAssignNull(w io.Writer) {
emitNodeAssemblerMethodAssignNull_recursive(w, g.AdjCfg, g)
}
func (g structBuilderGenerator) EmitNodeAssemblerMethodAssignNode(w io.Writer) {
// AssignNode goes through three phases:
// 1. is it null? Jump over to AssignNull (which may or may not reject it).
// 2. is it our own type? Handle specially -- we might be able to do efficient things.
// 3. is it the right kind to morph into us? Do so.
//
// We do not set m=midvalue in phase 3 -- it shouldn't matter unless you're trying to pull off concurrent access, which is wrong and unsafe regardless.
doTemplate(`
func (na *_{{ .Type | TypeSymbol }}__Assembler) 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 }}", 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 structBuilderGenerator) EmitNodeAssemblerOtherBits(w io.Writer) {
g.emitMapAssemblerChildTidyHelper(w)
g.emitMapAssemblerMethods(w)
g.emitKeyAssembler(w)
}
func (g structBuilderGenerator) emitMapAssemblerChildTidyHelper(w io.Writer) {
// This function attempts to clean up the state machine to acknolwedge child assembly finish.
// If the child was finished and we just collected it, return true and update state to maState_initial.
// Otherwise, if it wasn't done, return false;
// and the caller is almost certain to emit an error momentarily.
// The function will only be called when the current state is maState_midValue.
// (In general, the idea is that if the user is doing things correctly,
// this function will only be called when the child is in fact finished.)
// Most of the logic here is about nullables and not optionals,
// because if you're an optional that's absent, you never got to value assembly.
// There's still one branch for optionals, though, because they have a different residence for 'm' just as nullables do.
// Child assemblers are expected to control their own state machines;
// for values that have maybes, we never change their maybe state again, so the usual logic should hold;
// for values that don't have maybes (and thus share 'cm')...
// We don't bother to nil their 'm' pointer; the worst that can happen is an over-held assembler for that field
// can make a bizarre and broken transition for a subsequent field, which will result in very ugly errors, but isn't unsafe per se.
// We do nil their 'w' pointer, though: we don't want a set to that able to leak in later if we're on the way to Finish!
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__Assembler) valueFinishTidy() bool {
switch ma.f {
{{- range $i, $field := .Type.Fields }}
case {{ $i }}:
{{- if $field.IsNullable }}
switch ma.w.{{ $field | FieldSymbolLower }}.m {
case schema.Maybe_Null:
ma.state = maState_initial
return true
case schema.Maybe_Value:
{{- if (MaybeUsesPtr $field.Type) }}
ma.w.{{ $field | FieldSymbolLower }}.v = ma.ca_{{ $field | FieldSymbolLower }}.w
{{- end}}
ma.state = maState_initial
return true
default:
return false
}
{{- else if $field.IsOptional }}
switch ma.w.{{ $field | FieldSymbolLower }}.m {
case schema.Maybe_Value:
{{- if (MaybeUsesPtr $field.Type) }}
ma.w.{{ $field | FieldSymbolLower }}.v = ma.ca_{{ $field | FieldSymbolLower }}.w
{{- end}}
ma.state = maState_initial
return true
default:
return false
}
{{- else}}
switch ma.cm {
case schema.Maybe_Value:
ma.ca_{{ $field | FieldSymbolLower }}.w = nil
ma.cm = schema.Maybe_Absent
ma.state = maState_initial
return true
default:
return false
}
{{- end}}
{{- end}}
default:
panic("unreachable")
}
}
`, w, g.AdjCfg, g)
}
func (g structBuilderGenerator) emitMapAssemblerMethods(w io.Writer) {
// FUTURE: some of the setup of the child assemblers could probably be DRY'd up.
doTemplate(`
func (ma *_{{ .Type | TypeSymbol }}__Assembler) 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
case maState_finished:
panic("invalid state: AssembleEntry cannot be called on an assembler that's already finished")
}
{{- $type := .Type -}} {{- /* ranging modifies dot, unhelpfully */ -}}
{{- if .Type.Fields }}
switch k {
{{- range $i, $field := .Type.Fields }}
case "{{ $field.Name }}":
if ma.s & fieldBit__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }} != 0 {
return nil, datamodel.ErrRepeatedMapKey{Key: &fieldName__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }}}
}
ma.s += fieldBit__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }}
ma.state = maState_midValue
ma.f = {{ $i }}
{{- if $field.IsMaybe }}
ma.ca_{{ $field | FieldSymbolLower }}.w = {{if not (MaybeUsesPtr $field.Type) }}&{{end}}ma.w.{{ $field | FieldSymbolLower }}.v
ma.ca_{{ $field | FieldSymbolLower }}.m = &ma.w.{{ $field | FieldSymbolLower }}.m
{{- if $field.IsNullable }}
ma.w.{{ $field | FieldSymbolLower }}.m = allowNull
{{- end}}
{{- else}}
ma.ca_{{ $field | FieldSymbolLower }}.w = &ma.w.{{ $field | FieldSymbolLower }}
ma.ca_{{ $field | FieldSymbolLower }}.m = &ma.cm
{{- end}}
return &ma.ca_{{ $field | FieldSymbolLower }}, nil
{{- end}}
}
{{- end}}
return nil, schema.ErrInvalidKey{TypeName:"{{ .PkgName }}.{{ .Type.Name }}", Key:&_String{k}}
}
func (ma *_{{ .Type | TypeSymbol }}__Assembler) 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
case maState_finished:
panic("invalid state: AssembleKey cannot be called on an assembler that's already finished")
}
ma.state = maState_midKey
return (*_{{ .Type | TypeSymbol }}__KeyAssembler)(ma)
}
func (ma *_{{ .Type | TypeSymbol }}__Assembler) 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.f {
{{- range $i, $field := .Type.Fields }}
case {{ $i }}:
{{- if $field.IsMaybe }}
ma.ca_{{ $field | FieldSymbolLower }}.w = {{if not (MaybeUsesPtr $field.Type) }}&{{end}}ma.w.{{ $field | FieldSymbolLower }}.v
ma.ca_{{ $field | FieldSymbolLower }}.m = &ma.w.{{ $field | FieldSymbolLower }}.m
{{- if $field.IsNullable }}
ma.w.{{ $field | FieldSymbolLower }}.m = allowNull
{{- end}}
{{- else}}
ma.ca_{{ $field | FieldSymbolLower }}.w = &ma.w.{{ $field | FieldSymbolLower }}
ma.ca_{{ $field | FieldSymbolLower }}.m = &ma.cm
{{- end}}
return &ma.ca_{{ $field | FieldSymbolLower }}
{{- end}}
default:
panic("unreachable")
}
}
func (ma *_{{ .Type | TypeSymbol }}__Assembler) 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.s & fieldBits__{{ $type | TypeSymbol }}_sufficient != fieldBits__{{ $type | TypeSymbol }}_sufficient {
err := schema.ErrMissingRequiredField{Missing: make([]string, 0)}
{{- range $i, $field := .Type.Fields }}
{{- if not $field.IsMaybe}}
if ma.s & fieldBit__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }} == 0 {
err.Missing = append(err.Missing, "{{ $field.Name }}")
}
{{- end}}
{{- end}}
return err
}
ma.state = maState_finished
*ma.m = schema.Maybe_Value
return nil
}
func (ma *_{{ .Type | TypeSymbol }}__Assembler) KeyPrototype() datamodel.NodePrototype {
return _String__Prototype{}
}
func (ma *_{{ .Type | TypeSymbol }}__Assembler) ValuePrototype(k string) datamodel.NodePrototype {
panic("todo structbuilder mapassembler valueprototype")
}
`, w, g.AdjCfg, g)
}
func (g structBuilderGenerator) emitKeyAssembler(w io.Writer) {
doTemplate(`
type _{{ .Type | TypeSymbol }}__KeyAssembler _{{ .Type | TypeSymbol }}__Assembler
`, w, g.AdjCfg, g)
stubs := mixins.StringAssemblerTraits{
PkgName: g.PkgName,
TypeName: g.TypeName + ".KeyAssembler",
AppliedPrefix: "_" + g.AdjCfg.TypeSymbol(g.Type) + "__Key",
}
// This key assembler can disregard any idea of complex keys because it's a struct!
// Struct field names must be strings (and quite simple ones at that).
stubs.EmitNodeAssemblerMethodBeginMap(w)
stubs.EmitNodeAssemblerMethodBeginList(w)
stubs.EmitNodeAssemblerMethodAssignNull(w)
stubs.EmitNodeAssemblerMethodAssignBool(w)
stubs.EmitNodeAssemblerMethodAssignInt(w)
stubs.EmitNodeAssemblerMethodAssignFloat(w)
doTemplate(`
func (ka *_{{ .Type | TypeSymbol }}__KeyAssembler) AssignString(k string) error {
if ka.state != maState_midKey {
panic("misuse: KeyAssembler held beyond its valid lifetime")
}
switch k {
{{- $type := .Type -}} {{- /* ranging modifies dot, unhelpfully */ -}}
{{- range $i, $field := .Type.Fields }}
case "{{ $field.Name }}":
if ka.s & fieldBit__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }} != 0 {
return datamodel.ErrRepeatedMapKey{Key: &fieldName__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }}}
}
ka.s += fieldBit__{{ $type | TypeSymbol }}_{{ $field | FieldSymbolUpper }}
ka.state = maState_expectValue
ka.f = {{ $i }}
return nil
{{- end}}
default:
return schema.ErrInvalidKey{TypeName:"{{ .PkgName }}.{{ .Type.Name }}", Key:&_String{k}}
}
}
`, w, g.AdjCfg, g)
stubs.EmitNodeAssemblerMethodAssignBytes(w)
stubs.EmitNodeAssemblerMethodAssignLink(w)
doTemplate(`
func (ka *_{{ .Type | TypeSymbol }}__KeyAssembler) AssignNode(v datamodel.Node) error {
if v2, err := v.AsString(); err != nil {
return err
} else {
return ka.AssignString(v2)
}
}
func (_{{ .Type | TypeSymbol }}__KeyAssembler) Prototype() datamodel.NodePrototype {
return _String__Prototype{}
}
`, w, g.AdjCfg, g)
}