mirror of https://github.com/tidwall/tile38.git
112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
package json // import "layeh.com/gopher-json"
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"strconv"
|
|
|
|
"github.com/yuin/gopher-lua"
|
|
)
|
|
|
|
var (
|
|
errFunction = errors.New("cannot encode function to JSON")
|
|
errChannel = errors.New("cannot encode channel to JSON")
|
|
errState = errors.New("cannot encode state to JSON")
|
|
errUserData = errors.New("cannot encode userdata to JSON")
|
|
errNested = errors.New("cannot encode recursively nested tables to JSON")
|
|
)
|
|
|
|
type jsonValue struct {
|
|
lua.LValue
|
|
visited map[*lua.LTable]bool
|
|
}
|
|
|
|
func (j jsonValue) MarshalJSON() ([]byte, error) {
|
|
return toJSON(j.LValue, j.visited)
|
|
}
|
|
|
|
func toJSON(value lua.LValue, visited map[*lua.LTable]bool) (data []byte, err error) {
|
|
switch converted := value.(type) {
|
|
case lua.LBool:
|
|
data, err = json.Marshal(converted)
|
|
case lua.LChannel:
|
|
err = errChannel
|
|
case lua.LNumber:
|
|
data, err = json.Marshal(converted)
|
|
case *lua.LFunction:
|
|
err = errFunction
|
|
case *lua.LNilType:
|
|
data, err = json.Marshal(converted)
|
|
case *lua.LState:
|
|
err = errState
|
|
case lua.LString:
|
|
data, err = json.Marshal(converted)
|
|
case *lua.LTable:
|
|
var arr []jsonValue
|
|
var obj map[string]jsonValue
|
|
|
|
if visited[converted] {
|
|
panic(errNested)
|
|
}
|
|
visited[converted] = true
|
|
|
|
converted.ForEach(func(k lua.LValue, v lua.LValue) {
|
|
i, numberKey := k.(lua.LNumber)
|
|
if numberKey && obj == nil {
|
|
index := int(i) - 1
|
|
if index != len(arr) {
|
|
// map out of order; convert to map
|
|
obj = make(map[string]jsonValue)
|
|
for i, value := range arr {
|
|
obj[strconv.Itoa(i+1)] = value
|
|
}
|
|
obj[strconv.Itoa(index+1)] = jsonValue{v, visited}
|
|
return
|
|
}
|
|
arr = append(arr, jsonValue{v, visited})
|
|
return
|
|
}
|
|
if obj == nil {
|
|
obj = make(map[string]jsonValue)
|
|
for i, value := range arr {
|
|
obj[strconv.Itoa(i+1)] = value
|
|
}
|
|
}
|
|
obj[k.String()] = jsonValue{v, visited}
|
|
})
|
|
if obj != nil {
|
|
data, err = json.Marshal(obj)
|
|
} else {
|
|
data, err = json.Marshal(arr)
|
|
}
|
|
case *lua.LUserData:
|
|
// TODO: call metatable __tostring?
|
|
err = errUserData
|
|
}
|
|
return
|
|
}
|
|
|
|
func fromJSON(L *lua.LState, value interface{}) lua.LValue {
|
|
switch converted := value.(type) {
|
|
case bool:
|
|
return lua.LBool(converted)
|
|
case float64:
|
|
return lua.LNumber(converted)
|
|
case string:
|
|
return lua.LString(converted)
|
|
case []interface{}:
|
|
arr := L.CreateTable(len(converted), 0)
|
|
for _, item := range converted {
|
|
arr.Append(fromJSON(L, item))
|
|
}
|
|
return arr
|
|
case map[string]interface{}:
|
|
tbl := L.CreateTable(0, len(converted))
|
|
for key, item := range converted {
|
|
tbl.RawSetH(lua.LString(key), fromJSON(L, item))
|
|
}
|
|
return tbl
|
|
}
|
|
return lua.LNil
|
|
}
|