// ValueList generates a new ValueList type alias for the given list.
//
// The following is generated:
//
// type $valueListName []$valueType
//
// func (v $valueListName) ForEach(f func(wire.Value) error) error { ... }
//
// func (v $valueListName) Close() { ... }
//
// And $valueListName is returned. This may be used where a ValueList of the
// given type is expected.
func (l *listGenerator) ValueList(g Generator, spec *compile.ListSpec) (string, error) {
name := "_" + valueName(spec) + "_ValueList"
if l.HasLazyList(name) {
return name, nil
}
err := g.DeclareFromTemplate(
`
<$wire := import "go.uber.org/thriftrw/wire">
type <.Name> <typeReference .Spec>
<$i := newVar "i">
<$v := newVar "v">
<$x := newVar "x">
<$f := newVar "f">
<$w := newVar "w">
func (<$v> <.Name>) ForEach(<$f> func(<$wire>.Value) error) error {
<if isPrimitiveType .Spec.ValueSpec>
for _, <$x> := range <$v> {
<else>
for <$i>, <$x> := range <$v> {
if <$x> == nil {
return <import "fmt">.Errorf("invalid [%v]: value is nil", <$i>)
}
<end>
<$w>, err := <toWire .Spec.ValueSpec $x>
if err != nil {
// TODO(abg): nested error "invalid [%v]: %v"
return err
}
err = <$f>(<$w>)
if err != nil {
return err
}
}
return nil
}
func (<$v> <.Name>) Size() int {
return len(<$v>)
}
func (<.Name>) ValueType() <$wire>.Type {
return <typeCode .Spec.ValueSpec>
}
func (<.Name>) Close() {}
`,
struct {
Name string
Spec *compile.ListSpec
}{Name: name, Spec: spec},
)
return name, wrapGenerateError(spec.ThriftName(), err)
}
// Reader generates a function to read a list of the given type from a
// wire.List.
//
// func $name(l wire.List) ($listType, error) {
// ...
// }
//
// And returns its name.
func (l *listGenerator) Reader(g Generator, spec *compile.ListSpec) (string, error) {
name := "_" + valueName(spec) + "_Read"
if l.HasReader(name) {
return name, nil
}
err := g.DeclareFromTemplate(
`
<$wire := import "go.uber.org/thriftrw/wire">
<$listType := typeReference .Spec>
<$l := newVar "l">
<$i := newVar "i">
<$o := newVar "o">
<$x := newVar "x">
func <.Name>(<$l> <$wire>.ValueList) (<$listType>, error) {
if <$l>.ValueType() != <typeCode .Spec.ValueSpec> {
return nil, nil
}
<$o> := make(<$listType>, 0, <$l>.Size())
err := <$l>.ForEach(func(<$x> <$wire>.Value) error {
<$i>, err := <fromWire .Spec.ValueSpec $x>
if err != nil {
return err
}
<$o> = append(<$o>, <$i>)
return nil
})
<$l>.Close()
return <$o>, err
}
`,
struct {
Name string
Spec *compile.ListSpec
}{Name: name, Spec: spec},
)
return name, wrapGenerateError(spec.ThriftName(), err)
}