1 // Copyright 2020 CUE Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package adt 16 17 // CloseDef defines how individual fieldSets (corresponding to conjuncts) 18 // combine to determine whether a field is contained in a closed set. 19 // 20 // A CloseDef combines multiple conjuncts and embeddings. All CloseDefs are 21 // stored in slice. References to other CloseDefs are indices within this slice. 22 // Together they define the top of the tree of the expression tree of how 23 // conjuncts combine together (a canopy). 24 25 // isComplexStruct reports whether the Closed information should be copied as a 26 // subtree into the parent node using InsertSubtree. If not, the conjuncts can 27 // just be inserted at the current ID. 28 func isComplexStruct(ctx *OpContext, v *Vertex) bool { 29 return v.IsClosedStruct() 30 } 31 32 // TODO: cleanup code and error messages. Reduce duplication in some related 33 // code. 34 func verifyArc2(ctx *OpContext, f Feature, v *Vertex, isClosed bool) (found bool, err *Bottom) { 35 unreachableForDev(ctx) 36 37 // Don't check computed, temporary vertices. 38 if v.Label == InvalidLabel { 39 return true, nil 40 } 41 42 // TODO(perf): collect positions in error. 43 defer ctx.ReleasePositions(ctx.MarkPositions()) 44 45 // Note: it is okay to use parent here as this only needs to be computed 46 // for the original location. 47 if ok, required := Accept(ctx, v.Parent, f); ok || (!required && !isClosed) { 48 return true, nil 49 } 50 51 if !f.IsString() { 52 // if f.IsHidden() { Also change Accept in composite.go 53 return false, nil 54 } 55 56 if v != nil { 57 for _, c := range v.Conjuncts { 58 if pos := c.Field(); pos != nil { 59 ctx.AddPosition(pos) 60 } 61 } 62 } 63 64 for _, s := range v.Parent.Structs { 65 s.AddPositions(ctx) 66 } 67 68 return false, ctx.NewErrf("field not allowed") 69 } 70