/
instance.go
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/
instance.go
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// Copyright 2018 The CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cue
import (
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/build"
"cuelang.org/go/cue/errors"
"cuelang.org/go/internal"
"cuelang.org/go/internal/core/adt"
"cuelang.org/go/internal/core/compile"
"cuelang.org/go/internal/core/runtime"
)
// An InstanceOrValue is implemented by [Value] and *[Instance].
//
// This is a placeholder type that is used to allow Instance-based APIs to
// transition to Value-based APIs. The goals is to get rid of the Instance
// type before v1.0.0.
type InstanceOrValue interface {
Value() Value
internal()
}
func (Value) internal() {}
func (*Instance) internal() {}
// Value implements [InstanceOrValue].
func (v hiddenValue) Value() Value { return v }
// An Instance defines a single configuration based on a collection of
// underlying CUE files.
//
// Use of this type is being phased out in favor of [Value].
// Any APIs currently taking an Instance should use [InstanceOrValue]
// to transition to the new type without breaking users.
type Instance struct {
index *runtime.Runtime
root *adt.Vertex
ImportPath string
Dir string
PkgName string
DisplayName string
Incomplete bool // true if Pkg and all its dependencies are free of errors
Err errors.Error // non-nil if the package had errors
inst *build.Instance
}
type hiddenInstance = Instance
func addInst(x *runtime.Runtime, p *Instance) *Instance {
if p.inst == nil {
p.inst = &build.Instance{
ImportPath: p.ImportPath,
PkgName: p.PkgName,
}
}
x.AddInst(p.ImportPath, p.root, p.inst)
x.SetBuildData(p.inst, p)
p.index = x
return p
}
func lookupInstance(x *runtime.Runtime, p *build.Instance) *Instance {
if x, ok := x.BuildData(p); ok {
return x.(*Instance)
}
return nil
}
func getImportFromBuild(x *runtime.Runtime, p *build.Instance, v *adt.Vertex) *Instance {
inst := lookupInstance(x, p)
if inst != nil {
return inst
}
inst = &Instance{
ImportPath: p.ImportPath,
Dir: p.Dir,
PkgName: p.PkgName,
DisplayName: p.ImportPath,
root: v,
inst: p,
index: x,
}
if p.Err != nil {
inst.setListOrError(p.Err)
}
x.SetBuildData(p, inst)
return inst
}
func getImportFromNode(x *runtime.Runtime, v *adt.Vertex) *Instance {
p := x.GetInstanceFromNode(v)
if p == nil {
return nil
}
return getImportFromBuild(x, p, v)
}
func getImportFromPath(x *runtime.Runtime, id string) *Instance {
node := x.LoadImport(id)
if node == nil {
return nil
}
b := x.GetInstanceFromNode(node)
inst := lookupInstance(x, b)
if inst == nil {
inst = &Instance{
ImportPath: b.ImportPath,
PkgName: b.PkgName,
root: node,
inst: b,
index: x,
}
}
return inst
}
func init() {
internal.MakeInstance = func(value interface{}) interface{} {
v := value.(Value)
x := v.eval(v.ctx())
st, ok := x.(*adt.Vertex)
if !ok {
st = &adt.Vertex{}
st.AddConjunct(adt.MakeRootConjunct(nil, x))
}
return addInst(v.idx, &Instance{
root: st,
})
}
}
// newInstance creates a new instance. Use Insert to populate the instance.
func newInstance(x *runtime.Runtime, p *build.Instance, v *adt.Vertex) *Instance {
// TODO: associate root source with structLit.
inst := &Instance{
root: v,
inst: p,
}
if p != nil {
inst.ImportPath = p.ImportPath
inst.Dir = p.Dir
inst.PkgName = p.PkgName
inst.DisplayName = p.ImportPath
if p.Err != nil {
inst.setListOrError(p.Err)
}
}
x.AddInst(p.ImportPath, v, p)
x.SetBuildData(p, inst)
inst.index = x
return inst
}
func (inst *Instance) setListOrError(err errors.Error) {
inst.Incomplete = true
inst.Err = errors.Append(inst.Err, err)
}
func (inst *Instance) setError(err errors.Error) {
inst.Incomplete = true
inst.Err = errors.Append(inst.Err, err)
}
func (inst *Instance) eval(ctx *adt.OpContext) adt.Value {
// TODO: remove manifest here?
v := manifest(ctx, inst.root)
return v
}
// ID returns the package identifier that uniquely qualifies module and
// package name.
func (inst *Instance) ID() string {
if inst == nil || inst.inst == nil {
return ""
}
return inst.inst.ID()
}
// Doc returns the package comments for this instance.
//
// Deprecated: use inst.Value().Doc()
func (inst *hiddenInstance) Doc() []*ast.CommentGroup {
return inst.Value().Doc()
}
// Value returns the root value of the configuration. If the configuration
// defines in emit value, it will be that value. Otherwise it will be all
// top-level values.
func (inst *Instance) Value() Value {
ctx := newContext(inst.index)
inst.root.Finalize(ctx)
// TODO: consider including these statistics as well. Right now, this only
// seems to be used in cue cmd for "auxiliary" evaluations, like filetypes.
// These arguably skew the actual statistics for the cue command line, so
// it is convenient to not include these.
// adt.AddStats(ctx)
return newVertexRoot(inst.index, ctx, inst.root)
}
// Eval evaluates an expression within an existing instance.
//
// Expressions may refer to builtin packages if they can be uniquely identified.
//
// Deprecated: use
// inst.Value().Context().BuildExpr(expr, Scope(inst.Value), InferBuiltins(true))
func (inst *hiddenInstance) Eval(expr ast.Expr) Value {
v := inst.Value()
return v.Context().BuildExpr(expr, Scope(v), InferBuiltins(true))
}
// DO NOT USE.
//
// Deprecated: do not use.
func Merge(inst ...*Instance) *Instance {
v := &adt.Vertex{}
i := inst[0]
ctx := newContext(i.index)
// TODO: interesting test: use actual unification and then on K8s corpus.
for _, i := range inst {
w := i.Value()
v.AddConjunct(adt.MakeRootConjunct(nil, w.v.ToDataAll(ctx)))
}
v.Finalize(ctx)
p := addInst(i.index, &Instance{
root: v,
})
return p
}
// Build creates a new instance from the build instances, allowing unbound
// identifier to bind to the top-level field in inst. The top-level fields in
// inst take precedence over predeclared identifier and builtin functions.
//
// Deprecated: use Context.Build
func (inst *hiddenInstance) Build(p *build.Instance) *Instance {
p.Complete()
idx := inst.index
r := inst.index
rErr := r.ResolveFiles(p)
cfg := &compile.Config{Scope: valueScope(Value{idx: r, v: inst.root})}
v, err := compile.Files(cfg, r, p.ID(), p.Files...)
v.AddConjunct(adt.MakeRootConjunct(nil, inst.root))
i := newInstance(idx, p, v)
if rErr != nil {
i.setListOrError(rErr)
}
if i.Err != nil {
i.setListOrError(i.Err)
}
if err != nil {
i.setListOrError(err)
}
return i
}
// Lookup reports the value at a path starting from the top level struct. The
// Exists method of the returned value will report false if the path did not
// exist. The Err method reports if any error occurred during evaluation. The
// empty path returns the top-level configuration struct. Use LookupDef for definitions or LookupField for
// any kind of field.
//
// Deprecated: use Value.LookupPath
func (inst *hiddenInstance) Lookup(path ...string) Value {
return inst.Value().Lookup(path...)
}
// LookupDef reports the definition with the given name within struct v. The
// Exists method of the returned value will report false if the definition did
// not exist. The Err method reports if any error occurred during evaluation.
//
// Deprecated: use Value.LookupPath
func (inst *hiddenInstance) LookupDef(path string) Value {
return inst.Value().LookupDef(path)
}
// LookupField reports a Field at a path starting from v, or an error if the
// path is not. The empty path returns v itself.
//
// It cannot look up hidden or unexported fields.
//
// Deprecated: this API does not work with new-style definitions. Use
// FieldByName defined on inst.Value().
//
// Deprecated: use Value.LookupPath
func (inst *hiddenInstance) LookupField(path ...string) (f FieldInfo, err error) {
v := inst.Value()
for _, k := range path {
s, err := v.Struct()
if err != nil {
return f, err
}
f, err = s.FieldByName(k, true)
if err != nil {
return f, err
}
if f.IsHidden {
return f, errNotFound
}
v = f.Value
}
return f, err
}
// Fill creates a new instance with the values of the old instance unified with
// the given value. It is not possible to update the emit value.
//
// Values may be any Go value that can be converted to CUE, an ast.Expr or
// a Value. In the latter case, it will panic if the Value is not from the same
// Runtime.
//
// Deprecated: use Value.FillPath()
func (inst *hiddenInstance) Fill(x interface{}, path ...string) (*Instance, error) {
v := inst.Value().Fill(x, path...)
inst = addInst(inst.index, &Instance{
root: v.v,
inst: nil,
// Omit ImportPath to indicate this is not an importable package.
Dir: inst.Dir,
PkgName: inst.PkgName,
Incomplete: inst.Incomplete,
})
return inst, nil
}