// scanStream scans the stream for the next token using the internal state machine.
// It will panic if it encounters a rune which it does not know how to handle.

scanStream scans the stream for the next token using the internal state machine.
It will panic if it encounters a rune which it does not know how to handle.
// scanStream scans the stream for the next token using the internal state machine . // It will panic if it encounters a rune which it does not know how to handle .
func (t *Tokenizer) scanStream() (*Token, error) {
	state := startState
	var tokenType TokenType
	var value []rune
	var nextRune rune
	var nextRuneType runeTokenClass
	var err error
	for {
		nextRune, _, err = t.input.ReadRune()
		nextRuneType = t.classifier.ClassifyRune(nextRune)
		if err == io.EOF {
			nextRuneType = eofRuneClass
			err = nil
		} else if err != nil {
			return nil, err
		}
		switch state {
		case startState: 
			{
				switch nextRuneType {
				case eofRuneClass:
					{
						return nil, io.EOF
					}
				case spaceRuneClass:
					{
					}
				case escapingQuoteRuneClass:
					{
						tokenType = WordToken
						state = quotingEscapingState
					}
				case nonEscapingQuoteRuneClass:
					{
						tokenType = WordToken
						state = quotingState
					}
				case escapeRuneClass:
					{
						tokenType = WordToken
						state = escapingState
					}
				case commentRuneClass:
					{
						tokenType = CommentToken
						state = commentState
					}
				default:
					{
						tokenType = WordToken
						value = append(value, nextRune)
						state = inWordState
					}
				}
			}
		case inWordState: 
			{
				switch nextRuneType {
				case eofRuneClass:
					{
						token := &Token{
							tokenType: tokenType,
							value:     string(value)}
						return token, err
					}
				case spaceRuneClass:
					{
						t.input.UnreadRune()
						token := &Token{
							tokenType: tokenType,
							value:     string(value)}
						return token, err
					}
				case escapingQuoteRuneClass:
					{
						state = quotingEscapingState
					}
				case nonEscapingQuoteRuneClass:
					{
						state = quotingState
					}
				case escapeRuneClass:
					{
						state = escapingState
					}
				default:
					{
						value = append(value, nextRune)
					}
				}
			}
		case escapingState: 
			{
				switch nextRuneType {
				case eofRuneClass:
					{
						err = fmt.Errorf("EOF found after escape character")
						token := &Token{
							tokenType: tokenType,
							value:     string(value)}
						return token, err
					}
				default:
					{
						state = inWordState
						value = append(value, nextRune)
					}
				}
			}
		case escapingQuotedState: 
			{
				switch nextRuneType {
				case eofRuneClass:
					{
						err = fmt.Errorf("EOF found after escape character")
						token := &Token{
							tokenType: tokenType,
							value:     string(value)}
						return token, err
					}
				default:
					{
						state = quotingEscapingState
						value = append(value, nextRune)
					}
				}
			}
		case quotingEscapingState: 
			{
				switch nextRuneType {
				case eofRuneClass:
					{
						err = fmt.Errorf("EOF found when expecting closing quote")
						token := &Token{
							tokenType: tokenType,
							value:     string(value)}
						return token, err
					}
				case escapingQuoteRuneClass:
					{
						state = inWordState
					}
				case escapeRuneClass:
					{
						state = escapingQuotedState
					}
				default:
					{
						value = append(value, nextRune)
					}
				}
			}
		case quotingState: 
			{
				switch nextRuneType {
				case eofRuneClass:
					{
						err = fmt.Errorf("EOF found when expecting closing quote")
						token := &Token{
							tokenType: tokenType,
							value:     string(value)}
						return token, err
					}
				case nonEscapingQuoteRuneClass:
					{
						state = inWordState
					}
				default:
					{
						value = append(value, nextRune)
					}
				}
			}
		case commentState: 
			{
				switch nextRuneType {
				case eofRuneClass:
					{
						token := &Token{
							tokenType: tokenType,
							value:     string(value)}
						return token, err
					}
				case spaceRuneClass:
					{
						if nextRune == '\n' {
							state = startState
							token := &Token{
								tokenType: tokenType,
								value:     string(value)}
							return token, err
						} else {
							value = append(value, nextRune)
						}
					}
				default:
					{
						value = append(value, nextRune)
					}
				}
			}
		default:
			{
				return nil, fmt.Errorf("Unexpected state: %v", state)
			}
		}
	}
}
func ( t * Tokenizer ) scanStream ( ) ( * Token , error ) { state := startState var tokenType TokenType var value [ ] rune var nextRune rune var nextRuneType runeTokenClass var err error for { nextRune , _ , err = t . input . ReadRune ( ) nextRuneType = t . classifier . ClassifyRune ( nextRune ) if err == io . EOF { nextRuneType = eofRuneClass err = nil } else if err != nil { return nil , err } switch state { case startState : { switch nextRuneType { case eofRuneClass : { return nil , io . EOF } case spaceRuneClass : { } case escapingQuoteRuneClass : { tokenType = WordToken state = quotingEscapingState } case nonEscapingQuoteRuneClass : { tokenType = WordToken state = quotingState } case escapeRuneClass : { tokenType = WordToken state = escapingState } case commentRuneClass : { tokenType = CommentToken state = commentState } default : { tokenType = WordToken value = append ( value , nextRune ) state = inWordState } } } case inWordState : { switch nextRuneType { case eofRuneClass : { token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } case spaceRuneClass : { t . input . UnreadRune ( ) token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } case escapingQuoteRuneClass : { state = quotingEscapingState } case nonEscapingQuoteRuneClass : { state = quotingState } case escapeRuneClass : { state = escapingState } default : { value = append ( value , nextRune ) } } } case escapingState : { switch nextRuneType { case eofRuneClass : { err = fmt . Errorf ( " " ) token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } default : { state = inWordState value = append ( value , nextRune ) } } } case escapingQuotedState : { switch nextRuneType { case eofRuneClass : { err = fmt . Errorf ( " " ) token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } default : { state = quotingEscapingState value = append ( value , nextRune ) } } } case quotingEscapingState : { switch nextRuneType { case eofRuneClass : { err = fmt . Errorf ( " " ) token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } case escapingQuoteRuneClass : { state = inWordState } case escapeRuneClass : { state = escapingQuotedState } default : { value = append ( value , nextRune ) } } } case quotingState : { switch nextRuneType { case eofRuneClass : { err = fmt . Errorf ( " " ) token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } case nonEscapingQuoteRuneClass : { state = inWordState } default : { value = append ( value , nextRune ) } } } case commentState : { switch nextRuneType { case eofRuneClass : { token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } case spaceRuneClass : { if nextRune == '\n' { state = startState token := & Token { tokenType : tokenType , value : string ( value ) } return token , err } else { value = append ( value , nextRune ) } } default : { value = append ( value , nextRune ) } } } default : { return nil , fmt . Errorf ( " " , state ) } } } }
scanStream scans the stream for the next token using the internal state machine.
scanStream scans the stream for the next token using the internal state machine .
// no runes read yet
 // in a regular word
 // the rune after an escape character
 // the next rune after an escape character, in double quotes
 // in escaping double quotes
 // in non-escaping single quotes
 // in a comment
