mirror of https://github.com/astaxie/beego.git
434 lines
8.9 KiB
Go
434 lines
8.9 KiB
Go
package goyaml2
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import (
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"bufio"
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"fmt"
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"github.com/wendal/errors"
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"io"
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"log"
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"strings"
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)
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const (
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DEBUG = true
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MAP_KEY_ONLY = iota
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)
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func Read(r io.Reader) (interface{}, error) {
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yr := &yamlReader{}
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yr.br = bufio.NewReader(r)
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obj, err := yr.ReadObject(0)
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if err == io.EOF {
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err = nil
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}
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if obj == nil {
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log.Println("Obj == nil")
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}
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return obj, err
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}
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type yamlReader struct {
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br *bufio.Reader
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nodes []interface{}
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lineNum int
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lastLine string
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}
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func (y *yamlReader) ReadObject(minIndent int) (interface{}, error) {
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line, err := y.NextLine()
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if err != nil {
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if err == io.EOF && line != "" {
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//log.Println("Read EOF , but still some data here")
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} else {
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//log.Println("ReadERR", err)
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return nil, err
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}
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}
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y.lastLine = line
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indent, str := getIndent(line)
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if indent < minIndent {
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//log.Println("Current Indent Unexpect : ", str, indent, minIndent)
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return nil, y.Error("Unexpect Indent", nil)
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}
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if indent > minIndent {
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//log.Println("Change minIndent from %d to %d", minIndent, indent)
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minIndent = indent
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}
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switch str[0] {
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case '-':
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return y.ReadList(minIndent)
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case '[':
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fallthrough
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case '{':
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y.lastLine = ""
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_, value, err := y.asMapKeyValue("tmp:" + str)
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if err != nil {
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return nil, y.Error("Err inline map/list", nil)
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}
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return value, nil
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}
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//log.Println("Read Objcet as Map", indent, str)
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return y.ReadMap(minIndent)
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}
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func (y *yamlReader) ReadList(minIndent int) ([]interface{}, error) {
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list := []interface{}{}
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for {
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line, err := y.NextLine()
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if err != nil {
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return list, err
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}
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indent, str := getIndent(line)
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switch {
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case indent < minIndent:
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y.lastLine = line
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if len(list) == 0 {
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return nil, nil
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}
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return list, nil
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case indent == minIndent:
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if str[0] != '-' {
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y.lastLine = line
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return list, nil
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}
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if len(str) < 2 {
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return nil, y.Error("ListItem is Emtry", nil)
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}
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key, value, err := y.asMapKeyValue(str[1:])
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if err != nil {
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return nil, err
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}
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switch value {
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case nil:
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list = append(list, key)
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case MAP_KEY_ONLY:
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return nil, y.Error("Not support List-Map yet", nil)
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default:
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_map := map[string]interface{}{key.(string): value}
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list = append(list, _map)
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_line, _err := y.NextLine()
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if _err != nil && _err != io.EOF {
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return nil, err
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}
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if _line == "" {
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return list, nil
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}
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y.lastLine = _line
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_indent, _str := getIndent(line)
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if _indent >= minIndent+2 {
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switch _str[0] {
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case '-':
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return nil, y.Error("Unexpect", nil)
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case '[':
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return nil, y.Error("Unexpect", nil)
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case '{':
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return nil, y.Error("Unexpect", nil)
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}
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// look like a map
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_map2, _err := y.ReadMap(_indent)
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if _map2 != nil {
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_map2[key.(string)] = value
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}
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if err != nil {
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return list, _err
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}
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}
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}
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continue
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default:
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return nil, y.Error("Bad Indent\n"+line, nil)
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}
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}
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panic("ERROR")
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return nil, errors.New("Impossible")
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}
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func (y *yamlReader) ReadMap(minIndent int) (map[string]interface{}, error) {
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_map := map[string]interface{}{}
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//log.Println("ReadMap", minIndent)
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OUT:
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for {
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line, err := y.NextLine()
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if err != nil {
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return _map, err
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}
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indent, str := getIndent(line)
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//log.Printf("Indent : %d, str = %s", indent, str)
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switch {
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case indent < minIndent:
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y.lastLine = line
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if len(_map) == 0 {
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return nil, nil
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}
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return _map, nil
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case indent == minIndent:
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key, value, err := y.asMapKeyValue(str)
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if err != nil {
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return nil, err
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}
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//log.Println("Key=", key, "value=", value)
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switch value {
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case nil:
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return nil, y.Error("Unexpect", nil)
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case MAP_KEY_ONLY:
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//log.Println("KeyOnly, read inner Map", key)
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//--------------------------------------
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_line, err := y.NextLine()
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if err != nil {
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if err == io.EOF {
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if _line == "" {
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// Emtry map item?
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_map[key.(string)] = nil
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return _map, err
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}
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} else {
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return nil, y.Error("ERR?", err)
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}
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}
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y.lastLine = _line
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_indent, _str := getIndent(_line)
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if _indent < minIndent {
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return _map, nil
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}
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////log.Println("##>>", _indent, _str)
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if _indent == minIndent {
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if _str[0] == '-' {
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//log.Println("Read Same-Indent ListItem for Map")
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_list, err := y.ReadList(minIndent)
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if _list != nil {
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_map[key.(string)] = _list
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}
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if err != nil {
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return _map, nil
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}
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continue OUT
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} else {
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// Emtry map item?
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_map[key.(string)] = nil
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continue OUT
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}
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}
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//--------------------------------------
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//log.Println("Read Map Item", _indent, _str)
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obj, err := y.ReadObject(_indent)
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if obj != nil {
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_map[key.(string)] = obj
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}
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if err != nil {
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return _map, err
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}
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default:
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_map[key.(string)] = value
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}
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default:
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//log.Println("Bad", indent, str)
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return nil, y.Error("Bad Indent\n"+line, nil)
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}
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}
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panic("ERROR")
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return nil, errors.New("Impossible")
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}
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func (y *yamlReader) NextLine() (line string, err error) {
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if y.lastLine != "" {
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line = y.lastLine
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y.lastLine = ""
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//log.Println("Return lastLine", line)
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return
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}
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for {
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line, err = y.br.ReadString('\n')
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y.lineNum++
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if err != nil {
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return
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}
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if strings.HasPrefix(line, "---") || strings.HasPrefix(line, "#") {
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continue
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}
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line = strings.TrimRight(line, "\n\t\r ")
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if line == "" {
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continue
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}
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//log.Println("Return Line", line)
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return
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}
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//log.Println("Impossbible : " + line)
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return // impossbile!
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}
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func getIndent(str string) (int, string) {
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indent := 0
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for i, s := range str {
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switch s {
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case ' ':
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indent++
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case '\t':
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indent += 4
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default:
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return indent, str[i:]
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}
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}
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panic("Invalid indent : " + str)
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return -1, ""
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}
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func (y *yamlReader) asMapKeyValue(str string) (key interface{}, val interface{}, err error) {
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tokens := splitToken(str)
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key = tokens[0]
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if len(tokens) == 1 {
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return key, nil, nil
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}
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if tokens[1] != ":" {
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return "", nil, y.Error("Unexpect "+str, nil)
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}
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if len(tokens) == 2 {
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return key, MAP_KEY_ONLY, nil
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}
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if len(tokens) == 3 {
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return key, tokens[2], nil
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}
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switch tokens[2] {
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case "[":
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list := []interface{}{}
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for i := 3; i < len(tokens)-1; i++ {
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list = append(list, tokens[i])
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}
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return key, list, nil
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case "{":
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_map := map[string]interface{}{}
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for i := 3; i < len(tokens)-1; i += 4 {
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//log.Println(">>>", i, tokens[i])
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if i > len(tokens)-2 {
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return "", nil, y.Error("Unexpect "+str, nil)
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}
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if tokens[i+1] != ":" {
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return "", nil, y.Error("Unexpect "+str, nil)
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}
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_map[tokens[i].(string)] = tokens[i+2]
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if (i + 3) < (len(tokens) - 1) {
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if tokens[i+3] != "," {
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return "", "", y.Error("Unexpect "+str, nil)
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}
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} else {
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break
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}
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}
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return key, _map, nil
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}
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//log.Println(str, tokens)
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return "", nil, y.Error("Unexpect "+str, nil)
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}
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func splitToken(str string) (tokens []interface{}) {
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str = strings.Trim(str, "\r\t\n ")
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if str == "" {
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panic("Impossbile")
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return
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}
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tokens = []interface{}{}
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lastPos := 0
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for i := 0; i < len(str); i++ {
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switch str[i] {
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case ':':
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fallthrough
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case '{':
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fallthrough
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case '[':
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fallthrough
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case '}':
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fallthrough
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case ']':
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fallthrough
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case ',':
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if i > lastPos {
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tokens = append(tokens, str[lastPos:i])
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}
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tokens = append(tokens, str[i:i+1])
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lastPos = i + 1
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case ' ':
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if i > lastPos {
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tokens = append(tokens, str[lastPos:i])
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}
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lastPos = i + 1
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case '\'':
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//log.Println("Scan End of String")
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i++
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start := i
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for ; i < len(str); i++ {
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if str[i] == '\'' {
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//log.Println("Found End of String", start, i)
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break
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}
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}
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tokens = append(tokens, str[start:i])
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lastPos = i + 1
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case '"':
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i++
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start := i
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for ; i < len(str); i++ {
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if str[i] == '"' {
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break
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}
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}
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tokens = append(tokens, str[start:i])
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lastPos = i + 1
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}
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}
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////log.Println("last", lastPos)
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if lastPos < len(str) {
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tokens = append(tokens, str[lastPos:])
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}
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if len(tokens) == 1 {
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tokens[0] = string2Val(tokens[0].(string))
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return
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}
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if tokens[1] == ":" {
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if len(tokens) == 2 {
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return
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}
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if tokens[2] == "{" || tokens[2] == "[" {
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return
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}
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str = strings.Trim(strings.SplitN(str, ":", 2)[1], "\t ")
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if len(str) > 2 {
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if str[0] == '\'' && str[len(str)-1] == '\'' {
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str = str[1 : len(str)-1]
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} else if str[0] == '"' && str[len(str)-1] == '"' {
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str = str[1 : len(str)-1]
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}
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}
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val := string2Val(str)
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tokens = []interface{}{tokens[0], tokens[1], val}
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return
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}
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if len(str) > 2 {
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if str[0] == '\'' && str[len(str)-1] == '\'' {
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str = str[1 : len(str)-1]
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} else if str[0] == '"' && str[len(str)-1] == '"' {
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str = str[1 : len(str)-1]
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}
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}
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val := string2Val(str)
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tokens = []interface{}{val}
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return
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}
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func (y *yamlReader) Error(msg string, err error) error {
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if err != nil {
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return errors.New(fmt.Sprintf("line %d : %s : %v", y.lineNum, msg, err.Error()))
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}
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return errors.New(fmt.Sprintf("line %d >> %s", y.lineNum, msg))
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}
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