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// Copyright 2021 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 value contains functions for converting values to internal types
// and various other Value-related utilities.
package value
import (
"strings"
"cuelang.org/go/cue"
"cuelang.org/go/internal/core/adt"
"cuelang.org/go/internal/core/convert"
"cuelang.org/go/internal/core/eval"
"cuelang.org/go/internal/core/runtime"
"cuelang.org/go/internal/types"
)
// Context returns the cue.Context of the given argument.
func Context[Ctx *cue.Runtime | *cue.Context | cue.Value | *adt.OpContext](ctx Ctx) *cue.Context {
switch x := any(ctx).(type) {
case *cue.Runtime:
(*runtime.Runtime)(x).Init()
return (*cue.Context)(x)
case *cue.Context:
return x
case cue.Value:
r, _ := ToInternal(x)
return (*cue.Context)(r)
case *adt.OpContext:
r := x.Runtime.(*runtime.Runtime)
return (*cue.Context)(r)
}
panic("unreachable")
}
// OpContext returns an OpContext with proper node formatting initialized.
func OpContext[Ctx *cue.Runtime | *cue.Context | cue.Value](c Ctx) *adt.OpContext {
var r *runtime.Runtime
var v *adt.Vertex
switch x := any(c).(type) {
case *cue.Runtime:
r = (*runtime.Runtime)(x)
r.Init()
case *cue.Context:
r = (*runtime.Runtime)(x)
case cue.Value:
r, v = ToInternal(x)
default:
panic("unreachable")
}
return eval.NewContext(r, v)
}
func ToInternal(v cue.Value) (*runtime.Runtime, *adt.Vertex) {
var t types.Value
v.Core(&t)
return t.R, t.V
}
func Vertex(v cue.Value) *adt.Vertex {
var t types.Value
v.Core(&t)
return t.V
}
// Make wraps cue.MakeValue.
func Make(ctx *adt.OpContext, v adt.Value) cue.Value {
return Context(ctx).Encode(v)
}
// UnifyBuiltin returns the given Value unified with the given builtin template.
func UnifyBuiltin(v cue.Value, kind string) cue.Value {
pkg, name, _ := strings.Cut(kind, ".")
s := runtime.SharedRuntime().LoadImport(pkg)
if s == nil {
return v
}
ctx := v.Context()
a := s.Lookup((*runtime.Runtime)(ctx).Label(name, false))
if a == nil {
return v
}
return v.Unify(ctx.Encode(a))
}
func FromGoValue(r *cue.Context, x interface{}, nilIsTop bool) cue.Value {
rt := (*runtime.Runtime)(r)
rt.Init()
ctx := eval.NewContext(rt, nil)
v := convert.GoValueToValue(ctx, x, nilIsTop)
n := adt.ToVertex(v)
return r.Encode(n)
}
func FromGoType(r *cue.Context, x interface{}) cue.Value {
rt := (*runtime.Runtime)(r)
rt.Init()
ctx := eval.NewContext(rt, nil)
expr, err := convert.GoTypeToExpr(ctx, x)
if err != nil {
expr = &adt.Bottom{Err: err}
}
n := &adt.Vertex{}
n.AddConjunct(adt.MakeRootConjunct(nil, expr))
return r.Encode(n)
}
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