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package kong
import (
"encoding/json"
"io"
"strings"
)
// A Resolver resolves a Flag value from an external source.
type Resolver interface {
// Validate configuration against Application.
//
// This can be used to validate that all provided configuration is valid within this application.
Validate(app *Application) error
// Resolve the value for a Flag.
Resolve(context *Context, parent *Path, flag *Flag) (interface{}, error)
}
// ResolverFunc is a convenience type for non-validating Resolvers.
type ResolverFunc func(context *Context, parent *Path, flag *Flag) (interface{}, error)
var _ Resolver = ResolverFunc(nil)
func (r ResolverFunc) Resolve(context *Context, parent *Path, flag *Flag) (interface{}, error) { //nolint: revive
return r(context, parent, flag)
}
func (r ResolverFunc) Validate(app *Application) error { return nil } //nolint: revive
// JSON returns a Resolver that retrieves values from a JSON source.
//
// Flag names are used as JSON keys indirectly, by tring snake_case and camelCase variants.
func JSON(r io.Reader) (Resolver, error) {
values := map[string]interface{}{}
err := json.NewDecoder(r).Decode(&values)
if err != nil {
return nil, err
}
var f ResolverFunc = func(context *Context, parent *Path, flag *Flag) (interface{}, error) {
name := strings.ReplaceAll(flag.Name, "-", "_")
snakeCaseName := snakeCase(flag.Name)
raw, ok := values[name]
if ok {
return raw, nil
} else if raw, ok = values[snakeCaseName]; ok {
return raw, nil
}
raw = values
for _, part := range strings.Split(name, ".") {
if values, ok := raw.(map[string]interface{}); ok {
raw, ok = values[part]
if !ok {
return nil, nil
}
} else {
return nil, nil
}
}
return raw, nil
}
return f, nil
}
func snakeCase(name string) string {
name = strings.Join(strings.Split(strings.Title(name), "-"), "") //nolint: staticcheck
return strings.ToLower(name[:1]) + name[1:]
}
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