92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
package spec
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import (
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"bytes"
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"encoding/json"
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"reflect"
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"sort"
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)
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// OrderSchemaItem holds a named schema (e.g. from a property of an object)
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type OrderSchemaItem struct {
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Name string
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Schema
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}
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// OrderSchemaItems is a sortable slice of named schemas.
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// The ordering is defined by the x-order schema extension.
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type OrderSchemaItems []OrderSchemaItem
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// MarshalJSON produces a json object with keys defined by the name schemas
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// of the OrderSchemaItems slice, keeping the original order of the slice.
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func (items OrderSchemaItems) MarshalJSON() ([]byte, error) {
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buf := bytes.NewBuffer(nil)
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buf.WriteString("{")
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for i := range items {
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if i > 0 {
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buf.WriteString(",")
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}
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buf.WriteString("\"")
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buf.WriteString(items[i].Name)
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buf.WriteString("\":")
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bs, err := json.Marshal(&items[i].Schema)
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if err != nil {
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return nil, err
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}
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buf.Write(bs)
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}
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buf.WriteString("}")
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return buf.Bytes(), nil
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}
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func (items OrderSchemaItems) Len() int { return len(items) }
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func (items OrderSchemaItems) Swap(i, j int) { items[i], items[j] = items[j], items[i] }
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func (items OrderSchemaItems) Less(i, j int) (ret bool) {
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ii, oki := items[i].Extensions.GetString("x-order")
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ij, okj := items[j].Extensions.GetString("x-order")
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if oki {
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if okj {
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defer func() {
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if err := recover(); err != nil {
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defer func() {
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if err = recover(); err != nil {
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ret = items[i].Name < items[j].Name
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}
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}()
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ret = reflect.ValueOf(ii).String() < reflect.ValueOf(ij).String()
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}
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}()
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return reflect.ValueOf(ii).Int() < reflect.ValueOf(ij).Int()
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}
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return true
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} else if okj {
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return false
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}
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return items[i].Name < items[j].Name
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}
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// SchemaProperties is a map representing the properties of a Schema object.
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// It knows how to transform its keys into an ordered slice.
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type SchemaProperties map[string]Schema
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// ToOrderedSchemaItems transforms the map of properties into a sortable slice
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func (properties SchemaProperties) ToOrderedSchemaItems() OrderSchemaItems {
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items := make(OrderSchemaItems, 0, len(properties))
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for k, v := range properties {
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items = append(items, OrderSchemaItem{
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Name: k,
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Schema: v,
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})
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}
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sort.Sort(items)
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return items
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}
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// MarshalJSON produces properties as json, keeping their order.
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func (properties SchemaProperties) MarshalJSON() ([]byte, error) {
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if properties == nil {
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return []byte("null"), nil
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}
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return json.Marshal(properties.ToOrderedSchemaItems())
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}
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