blob: 22fb9406e21b9626a8760c449224d7983c678cdb [file] [log] [blame]
// Copyright 2019 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 gocode
import "text/template"
// Inputs:
// .pkgName the Go package name
var headerCode = template.Must(template.New("header").Parse(
`// Code generated by gocode.Generate; DO NOT EDIT.
package {{.pkgName}}
import (
"fmt"
"cuelang.org/go/cue"
"cuelang.org/go/encoding/gocode/gocodec"
)
`))
// Inputs:
// .prefix prefix to all generated variable names
// .cueName name of the top-level CUE value
// .goType Go type of the receiver or argument
// .zero zero value of the Go type; nil indicates no value
// .validate name of the validate function; "" means no validate
// .complete name of the complete function; "" means no complete
var stubCode = template.Must(template.New("type").Parse(`
var {{.prefix}}val{{.cueName}} = {{.prefix}}Make("{{.cueName}}", {{.zero}})
{{ $sig := .goType | printf "(x %s)" -}}
{{if .validate}}
// {{.validate}}{{if .func}}{{.cueName}}{{end}} validates x.
func {{if .func}}{{.validate}}{{.cueName}}{{$sig}}
{{- else -}}{{$sig}} {{.validate}}(){{end}} error {
return {{.prefix}}Codec.Validate({{.prefix}}val{{.cueName}}, x)
}
{{end}}
{{if .complete}}
// {{.complete}}{{if .func}}{{.cueName}}{{end}} completes x.
func {{if .func}}{{.complete}}{{.cueName}}{{$sig}}
{{- else -}}{{$sig}} {{.complete}}(){{end}} error {
return {{.prefix}}Codec.Complete({{.prefix}}val{{.cueName}}, x)
}
{{end}}
`))
// Inputs:
// .prefix prefix to all generated variable names
// .runtime the variable name of a user-supplied runtime, if any
// .data bytes obtained from Instance.MarshalBinary
var loadCode = template.Must(template.New("load").Parse(`
var {{.prefix}}Codec, {{.prefix}}Instance = func() (*gocodec.Codec, *cue.Instance) {
var r *cue.Runtime
r = {{if .runtime}}{{.runtime}}{{else}}&cue.Runtime{}{{end}}
instances, err := r.Unmarshal({{.prefix}}InstanceData)
if err != nil {
panic(err)
}
if len(instances) != 1 {
panic("expected encoding of exactly one instance")
}
return gocodec.New(r, nil), instances[0]
}()
// {{.prefix}}Make is called in the init phase to initialize CUE values for
// validation functions.
func {{.prefix}}Make(name string, x interface{}) cue.Value {
f, err := {{.prefix}}Instance.LookupField(name)
if err != nil {
panic(fmt.Errorf("could not find type %q in instance", name))
}
v := f.Value
if x != nil {
w, err := {{.prefix}}Codec.ExtractType(x)
if err != nil {
panic(err)
}
v = v.Unify(w)
}
return v
}
// Data size: {{len .data}} bytes.
var {{.prefix}}InstanceData = []byte({{printf "%+q" .data}})
`))