/
entity_iter.go
156 lines (146 loc) · 4.25 KB
/
entity_iter.go
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package relgom
import (
. "github.com/anz-bank/sysl/language/go/pkg/ast" //nolint:golint,stylecheck
)
func (g *entityGenerator) appendIterDecls(decls []Decl) []Decl {
return append(decls,
g.relationIteratorMethodDecl(),
g.iteratorIntfDecl(),
g.iteratorStructDecl(),
g.iteratorMoveNextMethodDecl(),
g.iteratorCurrentMethodDecl(),
)
}
func (g *entityGenerator) iteratorName() string {
return NonExportedName(g.tname + "Iterator")
}
func (g *entityGenerator) iteratorInterfaceName() string {
return ExportedName(g.tname + "Iterator")
}
// // Iterator returns an iterator over ${export(.name)} tuples in r.
//
// func (r ${export(.name)}Relation) Iterator() ${export(.name)}Iterator {
// return &${unexport(.name)}Iterator{r.model, r.set, nil}
// }
func (g *entityGenerator) relationIteratorMethodDecl() Decl {
return g.relationMethod(func(recv string, recvDot dotter) FuncDecl {
return FuncDecl{
Doc: Comments(Commentf("// Iterator returns an iterator over %s tuples in r.", g.tname)),
Name: *I("Iterator"),
Type: FuncType{
Results: Fields(Field{Type: I(g.iteratorInterfaceName())}),
},
Body: Block(
Return(AddrOf(Composite(I(g.iteratorName()),
KV(I("model"), recvDot("model")),
KV(I("i"), Call(recvDot("set", "Range"))),
))),
),
}
})
}
// // ${export(.name)}Iterator provides for iteration over a set of ${export(.name)} tuples.
//
// type ${export(.name)}Iterator interface {
// MoveNext() bool
// Current() ${export(.name)}
// }
func (g *entityGenerator) iteratorIntfDecl() Decl {
return Types(TypeSpec{
Name: *I(g.iteratorInterfaceName()),
Type: &InterfaceType{
Methods: *Fields(
Field{
Names: Idents("MoveNext"),
Type: &FuncType{
Params: *Fields().Parens(),
Results: Fields(Field{Type: I("bool")}),
},
},
Field{
Names: Idents("Current"),
Type: &FuncType{
Params: *Fields().Parens(),
Results: Fields(Field{Type: I(g.tname)}),
},
},
),
},
}).WithDoc(Commentf("// %s provides for iteration over a set of %[1]s tuples.", g.iteratorName()))
}
// type ${u(.name)}Iterator struct {
// model ${.model.name}
// set *seq.HashMap
// t *${export(.name)}
// }
func (g *entityGenerator) iteratorStructDecl() Decl {
return Types(TypeSpec{
Name: *I(g.iteratorName()),
Type: Struct(
Field{Names: Idents("model"), Type: I(g.modelName)},
Field{Names: Idents("i"), Type: Star(g.frozen("MapIterator"))},
Field{Names: Idents("t"), Type: Star(I(g.tname))},
),
})
}
func (g *entityGenerator) iteratorMethodDecl(f func(recv string, recvDot dotter) FuncDecl) *FuncDecl {
return method("i", Star(I(g.iteratorName())), f)
}
// // MoveNext implements ${X(.name)}Iterator.
//
// func (i *${u(.name)Iterator) MoveNext() bool {
// kv, set, has := i.set.FirstRestKV()
// if has {
// i.set = set
// i.t = &${X(.name)}{${u(.name)Data: kv.Val.(*${u(.name)Data), model: i.model}
// }
// return has
// }
func (g *entityGenerator) iteratorMoveNextMethodDecl() *FuncDecl {
return g.iteratorMethodDecl(func(recv string, recvDot dotter) FuncDecl {
return FuncDecl{
Doc: Comments(Commentf("// MoveNext implements seq.Setable.")),
Name: *I("MoveNext"),
Type: FuncType{
Results: Fields(Field{Type: I("bool")}),
},
Body: Block(
If(nil, Call(recvDot("i", "Next")),
Assign(recvDot("t"))("=")(
AddrOf(Composite(I(g.tname),
KV(I("data"), Assert(Call(Dot(I("i"), "i", "Value")), Star(I(g.dataName)))),
KV(I("model"), recvDot("model")),
)),
),
Return(I("true")),
),
Return(I("false")),
),
}
})
}
// // Current implements ${X(.name)}Iterator.
//
// func (i *${u(.name)}Iterator) Current() ${X(.name)} {
// if i.t == nil {
// panic("no current ${X(.name)}")
// }
// return i.t
// }
func (g *entityGenerator) iteratorCurrentMethodDecl() *FuncDecl {
return g.iteratorMethodDecl(func(recv string, recvDot dotter) FuncDecl {
return FuncDecl{
Doc: Comments(Commentf("// Current implements seq.Setable.")),
Name: *I("Current"),
Type: FuncType{
Results: Fields(Field{Type: I(g.tname)}),
},
Body: Block(
If(nil, Binary(recvDot("t"), "==", Nil()),
Panic(String("no current "+g.tname)),
),
Return(Star(recvDot("t"))),
),
}
})
}