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basic.go
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basic.go
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// Copyright 2021 Muvaffak Onus
//
// 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 traverser
import (
"bytes"
"fmt"
"go/types"
"text/template"
"github.com/pkg/errors"
)
const (
errFmtNotSameKind = "not same basic kind: %s and %s"
errFmtUnknownKind = "unknown basic kind: %s"
)
const AssignmentTmpl = `
{{ .BFieldPath }} = {{ .AFieldPath }}`
type AssignmentTmplInput struct {
AFieldPath string
BFieldPath string
}
func NewBasic() *Basic {
b := &Basic{
Templates: map[types.BasicKind]string{},
PointerTemplates: map[types.BasicKind]string{},
}
for i := 1; i < 26; i++ {
b.Templates[types.BasicKind(i)] = AssignmentTmpl
b.PointerTemplates[types.BasicKind(i)] = AssignmentTmpl
}
return b
}
type Basic struct {
Templates map[types.BasicKind]string
PointerTemplates map[types.BasicKind]string
}
func (bs *Basic) SetTemplate(t map[types.BasicKind]string) {
bs.Templates = t
}
func (bs *Basic) SetPointerTemplate(t map[types.BasicKind]string) {
bs.PointerTemplates = t
}
func (bs *Basic) Print(a, b *types.Basic, aFieldPath, bFieldPath string, isPointer bool) (string, error) {
if a.Kind() != b.Kind() {
return "", fmt.Errorf(errFmtNotSameKind, a.String(), b.String())
}
tmplStore := bs.Templates
if isPointer {
tmplStore = bs.PointerTemplates
}
tmpl, ok := tmplStore[a.Kind()]
if !ok {
return "", fmt.Errorf(errFmtUnknownKind, a.String())
}
i := AssignmentTmplInput{
AFieldPath: aFieldPath,
BFieldPath: bFieldPath,
}
t, err := template.New("basic").Parse(tmpl)
if err != nil {
return "", errors.Wrap(err, "cannot parse template")
}
result := &bytes.Buffer{}
err = t.Execute(result, i)
return string(result.Bytes()), errors.Wrap(err, "cannot execute template")
}