| // 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 |
| |
| // This file defines a rewriter that strips a fully evaluated value of its |
| // template. |
| |
| // TODO: currently strip templates does a full evaluation as it is hard to keep |
| // nodeRef and copied structs in sync. This is far from efficient, but it is the |
| // easiest to get correct. |
| |
| // stripTemplates evaluates v and strips the result of templates. |
| func stripTemplates(ctx *context, v value) value { |
| return rewrite(ctx, v, stripRewriter) |
| } |
| |
| func stripRewriter(ctx *context, v value) (value, bool) { |
| eval := ctx.manifest(v) |
| switch x := eval.(type) { |
| case *structLit: |
| x = x.expandFields(ctx) |
| if x.template != nil { |
| arcs := make(arcs, len(x.arcs)) |
| for i, a := range x.arcs { |
| a.setValue(rewrite(ctx, x.at(ctx, i), stripRewriter)) |
| arcs[i] = a |
| } |
| // TODO: verify that len(x.comprehensions) == 0 |
| return &structLit{x.baseValue, x.emit, nil, nil, arcs, nil}, false |
| } |
| } |
| return eval, true |
| } |