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walk.go
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walk.go
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package v1
import (
"fmt"
"reflect"
)
// Walk will perform a depth first walk of all schema nodes starting at node, calling visitor for each schema type found.
//
// If visitor returns false, the walk will be aborted.
func Walk(decls []*Decl, node any, visitor func(node any) error) error {
namedChain := make([]uint32, 0, 10)
return walk(decls, node, visitor, namedChain)
}
func walk(decls []*Decl, node any, visitor func(node any) error, namedChain []uint32) error {
// Check the visitor against the node type
if err := visitor(node); err != nil {
return err
}
switch node := node.(type) {
case *Type:
switch v := node.Typ.(type) {
case *Type_Named:
return walk(decls, v.Named, visitor, namedChain)
case *Type_Struct:
return walk(decls, v.Struct, visitor, namedChain)
case *Type_Map:
return walk(decls, v.Map, visitor, namedChain)
case *Type_List:
return walk(decls, v.List, visitor, namedChain)
case *Type_Builtin:
return walk(decls, v.Builtin, visitor, namedChain)
case *Type_Pointer:
return walk(decls, v.Pointer, visitor, namedChain)
case *Type_TypeParameter:
return walk(decls, v.TypeParameter, visitor, namedChain)
case *Type_Config:
return walk(decls, v.Config, visitor, namedChain)
default:
panic(fmt.Sprintf("unknown type encountered: %+v", reflect.TypeOf(v)))
}
case *Decl:
return walk(decls, decls[node.Id].Type, visitor, namedChain)
case *Named:
for _, typ := range node.TypeArguments {
if err := walk(decls, typ, visitor, namedChain); err != nil {
return err
}
}
// Have we already visited this named type?
for i := len(namedChain) - 1; i >= 0; i-- {
if namedChain[i] == node.Id {
return nil
}
}
namedChain = append(namedChain, node.Id)
return walk(decls, decls[node.Id].Type, visitor, namedChain)
case *Struct:
for _, field := range node.Fields {
if err := walk(decls, field.Typ, visitor, namedChain); err != nil {
return err
}
}
case *Map:
if err := walk(decls, node.Key, visitor, namedChain); err != nil {
return err
}
return walk(decls, node.Value, visitor, namedChain)
case *List:
return walk(decls, node.Elem, visitor, namedChain)
case Builtin:
return nil
case *Pointer:
return walk(decls, node.Base, visitor, namedChain)
case *TypeParameterRef:
return nil
case *ConfigValue:
return walk(decls, node.Elem, visitor, namedChain)
default:
panic(fmt.Sprintf("unsupported node type encountered during walk: %+v", reflect.TypeOf(node)))
}
return nil
}