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// Package file implements decoding between configuration in a file and a typed Configuration.
package file
import (
"fmt"
"github.com/BurntSushi/toml"
"github.com/traefik/paerser/parser"
"gopkg.in/yaml.v3"
)
const defaultRawSliceSeparator = "║"
// Decode decodes the given configuration file into the given element.
// The operation goes through three stages roughly summarized as:
// - file contents -> tree of untyped nodes
// - untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
// - "typed" nodes -> typed element.
func Decode(filePath string, element interface{}) error {
if element == nil {
return nil
}
filters := getRootFieldNames(element)
root, err := decodeFileToNode(filePath, filters...)
if err != nil {
return err
}
metaOpts := parser.MetadataOpts{TagName: parser.TagFile, AllowSliceAsStruct: false}
err = parser.AddMetadata(element, root, metaOpts)
if err != nil {
return err
}
return parser.Fill(element, root, parser.FillerOpts{AllowSliceAsStruct: false, RawSliceSeparator: defaultRawSliceSeparator})
}
// DecodeContent decodes the given configuration file content into the given element.
// The operation goes through three stages roughly summarized as:
// - file contents -> tree of untyped nodes
// - untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
// - "typed" nodes -> typed element.
func DecodeContent(content, extension string, element interface{}) error {
data := make(map[string]interface{})
switch extension {
case ".toml":
_, err := toml.Decode(content, &data)
if err != nil {
return err
}
case ".yml", ".yaml", ".json":
var err error
err = yaml.Unmarshal([]byte(content), &data)
if err != nil {
return err
}
default:
return fmt.Errorf("unsupported file extension: %s", extension)
}
filters := getRootFieldNames(element)
node, err := decodeRawToNode(data, filters...)
if err != nil {
return err
}
if len(node.Children) == 0 {
return nil
}
metaOpts := parser.MetadataOpts{TagName: parser.TagFile, AllowSliceAsStruct: false}
err = parser.AddMetadata(element, node, metaOpts)
if err != nil {
return err
}
return parser.Fill(element, node, parser.FillerOpts{AllowSliceAsStruct: false, RawSliceSeparator: defaultRawSliceSeparator})
}
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