mirror of https://git.jolheiser.com/ffdhall.git
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
package ffdhall
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import (
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"errors"
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"fmt"
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"io"
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"strings"
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"github.com/philandstuff/dhall-golang/v6"
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)
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// DhallParser is a helper function that uses a default DhallParseConfig.
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func DhallParser(r io.Reader, set func(name, value string) error) error {
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return (&DhallParseConfig{}).Parse(r, set)
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}
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// DhallParseConfig collects parameters for the Dhall config file parser.
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type DhallParseConfig struct {
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// Delimiter is used when concatenating nested node keys into a flag name.
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// The default delimiter is ".".
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Delimiter string
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}
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// Parse a Dhall document from the provided io.Reader, using the provided set
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// function to set flag values. Flag names are derived from the node names and
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// their key/value pairs.
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func (pc *DhallParseConfig) Parse(r io.Reader, set func(name, value string) error) error {
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if pc.Delimiter == "" {
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pc.Delimiter = "."
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}
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data, err := io.ReadAll(r)
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if err != nil {
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return err
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}
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// Compatibility with other parsers
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if strings.TrimSpace(string(data)) == "" {
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return nil
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}
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var m interface{}
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if err := dhall.Unmarshal(data, &m); err != nil {
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return DhallParseError{Inner: err}
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}
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mm, ok := m.(map[string]interface{})
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if !ok {
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return errors.New("could not unmarshal to map[string]interface{}")
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}
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if err := traverseMap(mm, pc.Delimiter, set); err != nil {
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return DhallParseError{Inner: err}
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}
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return nil
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}
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// DhallParseError wraps all errors originating from the DhallParser.
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type DhallParseError struct {
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Inner error
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}
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// Error implenents the error interface.
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func (e DhallParseError) Error() string {
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return fmt.Sprintf("could not parse Dhall config: %v", e.Inner)
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}
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// Unwrap implements the errors.Wrapper interface, allowing errors.Is and
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// errors.As to work with DhallParseErrors.
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func (e DhallParseError) Unwrap() error {
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return e.Inner
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}
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