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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| package yqlib | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "math" | ||
|
|
||
| lua "github.com/yuin/gopher-lua" | ||
| yaml "gopkg.in/yaml.v3" | ||
| ) | ||
|
|
||
| type luaDecoder struct { | ||
| reader io.Reader | ||
| finished bool | ||
| prefs LuaPreferences | ||
| } | ||
|
|
||
| func NewLuaDecoder(prefs LuaPreferences) Decoder { | ||
| return &luaDecoder{ | ||
| prefs: prefs, | ||
| } | ||
| } | ||
|
|
||
| func (dec *luaDecoder) Init(reader io.Reader) error { | ||
| dec.reader = reader | ||
| return nil | ||
| } | ||
|
|
||
| func (dec *luaDecoder) convertToYamlNode(ls *lua.LState, lv lua.LValue) *yaml.Node { | ||
| switch lv.Type() { | ||
| case lua.LTNil: | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!null", | ||
| Value: "", | ||
| } | ||
| case lua.LTBool: | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!bool", | ||
| Value: lv.String(), | ||
| } | ||
| case lua.LTNumber: | ||
| n := float64(lua.LVAsNumber(lv)) | ||
| // various special case floats | ||
| if math.IsNaN(n) { | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!float", | ||
| Value: ".nan", | ||
| } | ||
| } | ||
| if math.IsInf(n, 1) { | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!float", | ||
| Value: ".inf", | ||
| } | ||
| } | ||
| if math.IsInf(n, -1) { | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!float", | ||
| Value: "-.inf", | ||
| } | ||
| } | ||
|
|
||
| // does it look like an integer? | ||
| if n == float64(int(n)) { | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!int", | ||
| Value: lv.String(), | ||
| } | ||
| } | ||
|
|
||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!float", | ||
| Value: lv.String(), | ||
| } | ||
| case lua.LTString: | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "!!str", | ||
| Value: lv.String(), | ||
| } | ||
| case lua.LTFunction: | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| Tag: "tag:lua.org,2006,function", | ||
| Value: lv.String(), | ||
| } | ||
| case lua.LTTable: | ||
| // Simultaneously create a sequence and a map, pick which one to return | ||
| // based on whether all keys were consecutive integers | ||
| i := 1 | ||
| yaml_sequence := &yaml.Node{ | ||
| Kind: yaml.SequenceNode, | ||
| Tag: "!!seq", | ||
| } | ||
| yaml_map := &yaml.Node{ | ||
| Kind: yaml.MappingNode, | ||
| Tag: "!!map", | ||
| } | ||
| t := lv.(*lua.LTable) | ||
| k, v := ls.Next(t, lua.LNil) | ||
| for k != lua.LNil { | ||
| if ki, ok := k.(lua.LNumber); i != 0 && ok && math.Mod(float64(ki), 1) == 0 && int(ki) == i { | ||
| i++ | ||
| } else { | ||
| i = 0 | ||
| } | ||
| yaml_map.Content = append(yaml_map.Content, dec.convertToYamlNode(ls, k)) | ||
| yv := dec.convertToYamlNode(ls, v) | ||
| yaml_map.Content = append(yaml_map.Content, yv) | ||
| if i != 0 { | ||
| yaml_sequence.Content = append(yaml_sequence.Content, yv) | ||
| } | ||
| k, v = ls.Next(t, k) | ||
| } | ||
| if i != 0 { | ||
| return yaml_sequence | ||
| } | ||
| return yaml_map | ||
| default: | ||
| return &yaml.Node{ | ||
| Kind: yaml.ScalarNode, | ||
| LineComment: fmt.Sprintf("Unhandled Lua type: %s", lv.Type().String()), | ||
| Tag: "!!null", | ||
| Value: lv.String(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (dec *luaDecoder) decideTopLevelNode(ls *lua.LState) *yaml.Node { | ||
| if ls.GetTop() == 0 { | ||
| // no items were explicitly returned, encode the globals table instead | ||
| return dec.convertToYamlNode(ls, ls.Get(lua.GlobalsIndex)) | ||
| } | ||
| return dec.convertToYamlNode(ls, ls.Get(1)) | ||
| } | ||
|
|
||
| func (dec *luaDecoder) Decode() (*CandidateNode, error) { | ||
| if dec.finished { | ||
| return nil, io.EOF | ||
| } | ||
| ls := lua.NewState(lua.Options{SkipOpenLibs: true}) | ||
| defer ls.Close() | ||
| fn, err := ls.Load(dec.reader, "@input") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| ls.Push(fn) | ||
| err = ls.PCall(0, lua.MultRet, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| firstNode := dec.decideTopLevelNode(ls) | ||
| dec.finished = true | ||
| return &CandidateNode{ | ||
| Node: &yaml.Node{ | ||
| Kind: yaml.DocumentNode, | ||
| Content: []*yaml.Node{firstNode}, | ||
| }, | ||
| }, nil | ||
| } |
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