| // Copyright 2020 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 builtin |
| |
| import ( |
| "sort" |
| |
| "cuelang.org/go/cue" |
| "cuelang.org/go/internal/core/adt" |
| ) |
| |
| type PackageFunc func(ctx *adt.OpContext) (*adt.Vertex, error) |
| |
| // Register registers a builtin, the value of which will be built |
| // on first use. All builtins must be registered before first use of a runtime. |
| // This restriction may be eliminated in the future. |
| func Register(importPath string, f PackageFunc) { |
| builtins[importPath] = f |
| // TODO: remove at some point. |
| cue.AddBuiltinPackage(importPath, f) |
| } |
| |
| var builtins = map[string]PackageFunc{} |
| |
| func ImportPaths() (a []string) { |
| for s := range builtins { |
| a = append(a, s) |
| } |
| sort.Strings(a) |
| return a |
| } |
| |
| // Get return the builder for the package with the given path. |
| // It will panic if the path does not exist. |
| func Get(path string) PackageFunc { |
| return builtins[path] |
| } |