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package behavior
import (
"fmt"
"gopkg.in/yaml.v3"
)
// DescVariant is one alternative description, optionally gated by a condition.
type DescVariant struct {
Text string `yaml:"text"`
Condition *Condition `yaml:"condition,omitempty"`
}
// DescList is an ordered list of description variants. The first variant whose
// condition matches is shown.
//
// Content may author the common single, unconditional description two ways:
// as a bare scalar (`description: "A dark room."`) or as a list of variants
// (`description: [{text: "A dark room."}]`). MarshalYAML collapses a single
// unconditional variant back to the scalar form so machine-written room files
// stay close to what a human would type.
type DescList []DescVariant
func (d *DescList) UnmarshalYAML(value *yaml.Node) error {
switch value.Kind {
case yaml.ScalarNode:
var text string
if err := value.Decode(&text); err != nil {
return err
}
if text == "" {
*d = nil
return nil
}
*d = DescList{{Text: text}}
return nil
case yaml.SequenceNode:
out := make(DescList, 0, len(value.Content))
for _, item := range value.Content {
// Accept a bare string element as shorthand for a variant.
if item.Kind == yaml.ScalarNode {
var text string
if err := item.Decode(&text); err != nil {
return err
}
out = append(out, DescVariant{Text: text})
continue
}
var variant DescVariant
if err := item.Decode(&variant); err != nil {
return err
}
out = append(out, variant)
}
*d = out
return nil
case yaml.AliasNode:
return d.UnmarshalYAML(value.Alias)
case 0:
// An omitted/zero node leaves the list empty.
*d = nil
return nil
default:
return fmt.Errorf("description must be a string or a list of variants")
}
}
func (d DescList) MarshalYAML() (any, error) {
if len(d) == 0 {
return []DescVariant{}, nil
}
if len(d) == 1 && d[0].Condition == nil {
return d[0].Text, nil
}
return []DescVariant(d), nil
}
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