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// Copyright 2022 Google LLC
//
// 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 yamlfmt
import (
"context"
"fmt"
)
type FeatureFunc func(context.Context, []byte) (context.Context, []byte, error)
type Feature struct {
Name string
BeforeAction FeatureFunc
AfterAction FeatureFunc
}
type FeatureList []Feature
type FeatureApplyMode string
var (
FeatureApplyBefore FeatureApplyMode = "Before"
FeatureApplyAfter FeatureApplyMode = "After"
)
type FeatureApplyError struct {
err error
featureName string
mode FeatureApplyMode
}
func (e *FeatureApplyError) Error() string {
return fmt.Sprintf("Feature %s %sAction failed with error: %v", e.featureName, e.mode, e.err)
}
func (e *FeatureApplyError) Unwrap() error {
return e.err
}
func (fl FeatureList) ApplyFeatures(ctx context.Context, input []byte, mode FeatureApplyMode) (context.Context, []byte, error) {
// Declare err here so the result variable doesn't get shadowed in the loop
var err error
result := make([]byte, len(input))
copy(result, input)
for _, feature := range fl {
if mode == FeatureApplyBefore {
if feature.BeforeAction != nil {
ctx, result, err = feature.BeforeAction(ctx, result)
}
} else {
if feature.AfterAction != nil {
ctx, result, err = feature.AfterAction(ctx, result)
}
}
if err != nil {
return ctx, nil, &FeatureApplyError{
err: err,
featureName: feature.Name,
mode: mode,
}
}
}
return ctx, result, nil
}
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