feat: base implementation

core/interfaces/params/params.go

@@ -0,0 +1,56 @@
+package params
+
+import "errors"
+
+var (
+	ErrParamNotFound = errors.New("parameter not found")
+)
+
+type Registration struct {
+	Name        string
+	ShortHand   string
+	Description string
+	DefaultFunc func() string
+	ParseFunc   ParseFn
+}
+
+type ParseFn func(value string) (any, error)
+
+var ParseString ParseFn = func(value string) (any, error) { return value, nil }
+
+type Container struct {
+	params map[string]Value
+}
+
+type Value struct {
+	value   *string
+	parseFn ParseFn
+}
+
+func (c *Container) Register(key string, parseFn ParseFn) *string {
+	if c.params == nil {
+		c.params = make(map[string]Value)
+	}
+
+	item, exists := c.params[key]
+	if exists {
+		return item.value
+	}
+
+	var str string
+	value := Value{
+		parseFn: parseFn,
+		value:   &str,
+	}
+	c.params[key] = value
+	return value.value
+}
+
+func (c *Container) GetValue(key string) (any, error) {
+	item, exists := c.params[key]
+	if !exists {
+		return nil, ErrParamNotFound
+	}
+
+	return item.parseFn(*item.value)
+}