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// Copyright 2023 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 adt
import "strings"
// The functions and types in this file are use to construct test cases for
// fields_test.go and constraints_test.
// MatchPatternValue exports matchPatternValue for testing.
func MatchPatternValue(ctx *OpContext, p Value, f Feature, label Value) bool {
return matchPatternValue(ctx, p, f, label)
}
// FieldTester is used low-level testing of field insertion. It simulates
// how the evaluator inserts fields. This allows the closedness algorithm to be
// tested independently of the underlying evaluator implementation.
type FieldTester struct {
*OpContext
n *nodeContext
cc *closeContext
Root *Vertex
}
func NewFieldTester(r Runtime) *FieldTester {
v := &Vertex{}
ctx := New(v, &Config{Runtime: r})
n := v.getNodeContext(ctx, 1)
return &FieldTester{
OpContext: ctx,
n: n,
cc: v.rootCloseContext(ctx),
Root: v,
}
}
func (x *FieldTester) Error() string {
if b := x.n.node.Bottom(); b != nil && b.Err != nil {
return b.Err.Error()
}
var errs []string
for _, a := range x.n.node.Arcs {
if b := a.Bottom(); b != nil && b.Err != nil {
errs = append(errs, b.Err.Error())
}
}
return strings.Join(errs, "\n")
}
type declaration func(cc *closeContext)
// Run simulates a CUE evaluation of the given declarations.
func (x *FieldTester) Run(sub ...declaration) {
x.cc.incDependent(x.n.ctx, TEST, nil)
for i, s := range sub {
// We want to have i around for debugging purposes. Use i to avoid
// compiler error.
_ = i
s(x.cc)
}
x.cc.decDependent(x.n.ctx, TEST, nil)
x.cc.decDependent(x.n.ctx, ROOT, nil) // REF(decrement:nodeDone)
}
// Def represents fields that define a definition, such that
// Def(Field("a", "foo"), Field("b", "bar")) represents:
//
// #D: {
// a: "foo"
// b: "bar"
// }
//
// For some unique #D.
func (x *FieldTester) Def(sub ...declaration) declaration {
return x.spawn(closeDef, sub...)
}
func (x *FieldTester) spawn(t closeNodeType, sub ...declaration) declaration {
return func(cc *closeContext) {
ci := CloseInfo{cc: cc}
_, dc := ci.spawnCloseContext(x.n.ctx, t)
dc.incDependent(x.n.ctx, TEST, nil)
for _, sfn := range sub {
sfn(dc)
}
dc.decDependent(x.n.ctx, TEST, nil)
}
}
// Embed represents fields embedded within the current node, such that
// Embed(Field("a", "foo"), Def(Field("b", "bar"))) represents:
//
// {
// {
// a: "foo"
// #D
// }
// }
//
// For some #D: b: "bar".
func (x *FieldTester) Embed(sub ...declaration) declaration {
return x.spawn(closeEmbed, sub...)
}
// Group represents fields and embeddings within a single set of curly braces.
// This is used to test that an embedding of a closed value closes the struct
// in which it is embedded.
func (x *FieldTester) Group(sub ...declaration) declaration {
return x.spawn(0, sub...)
}
// EmbedDef represents fields that define a struct and embedded within the
// current node.
func (x *FieldTester) EmbedDef(sub ...declaration) declaration {
return x.Embed(x.Def(sub...))
}
// Field defines a field declaration such that Field("a", "foo") represents
//
// a: "foo"
//
// The value can be of type string, int64, bool, or Expr.
// Duplicate values (conjuncts) are retained as the deduplication check is
// bypassed for this.
func (x *FieldTester) Field(label string, a any) declaration {
return x.field(label, a, false)
}
// FieldDedup is like Field, but enables conjunct deduplication.
func (x *FieldTester) FieldDedup(label string, a any) declaration {
return x.field(label, a, true)
}
func (x *FieldTester) field(label string, a any, dedup bool) declaration {
f := x.StringLabel(label)
var v Expr
switch a := a.(type) {
case Expr:
v = a
case string:
v = x.NewString(a)
case int:
v = x.NewInt64(int64(a))
case bool:
v = x.newBool(a)
default:
panic("type not supported")
}
return func(cc *closeContext) {
var c Conjunct
c.Env = &Environment{Vertex: x.Root}
c.CloseInfo.cc = cc
c.x = v
c.CloseInfo.FromDef = cc.isDef
c.CloseInfo.FromEmbed = cc.isEmbed
x.n.insertArc(f, ArcMember, c, c.CloseInfo, dedup)
}
}
// Pat represents a pattern constraint, such that Pat(`<"a"`, "foo") represents
//
// [<"a"]: "foo"
func (x *FieldTester) Pat(pattern Value, v Expr) declaration {
if pattern == nil {
panic("nil pattern")
}
if v == nil {
panic("nil expr")
}
return func(cc *closeContext) {
var c Conjunct
c.Env = &Environment{Vertex: x.Root}
c.CloseInfo.cc = cc
c.x = v
c.CloseInfo.FromDef = cc.isDef
c.CloseInfo.FromEmbed = cc.isEmbed
x.n.insertPattern(pattern, c)
}
}
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