func Parse(input io.Reader) (commands []*Command, err error) {
	scanner := bufio.NewScanner(input)

	var currentToken token
	scanner.Split(tokenize(&currentToken))

	var tokens []token
	for scanner.Scan() {
		tokens = append(tokens, currentToken)

		if numTokens := len(tokens); numTokens > 1 {
			prevToken := tokens[numTokens-2]
			if mergedToken := prevToken.Merge(currentToken); mergedToken != nil {
				tokens[numTokens-2] = mergedToken
				tokens = tokens[:numTokens-1]
			}
		}
	}

	if err := scanner.Err(); err != nil {
		return nil, err
	}

	beginning := true
	var currentCommand *Command
	for _, token := range tokens {
		if token.Type() == tokenTypeWhitespace {
			continue // Ignore whitespace tokens.
		}

		if token.Type() == tokenTypeNewline {
			if !beginning { // handle leading newlines.
				// Newline signals the end of a command.
				commands = append(commands, currentCommand)
				currentCommand = nil
			}
			continue
		}

		if token.Type() == tokenTypeHeredoc {
			if currentCommand == nil {
				return nil, errors.New("unexpected heredoc")
			}

			currentCommand.Heredoc = token.Value()

			// Heredoc also signals the end of a command.
			commands = append(commands, currentCommand)
			currentCommand = nil

			continue
		}

		if token.Type() != tokenTypeArg {
			return nil, errors.New("unexpected token")
		}

		beginning = false
		// Append arg to current command.
		if currentCommand == nil {
			currentCommand = &Command{}
		}
		currentCommand.Args = append(currentCommand.Args, token.Value())
	}

	if currentCommand != nil {
		// Handles case with no trailing newline.
		commands = append(commands, currentCommand)
	}

	return commands, nil
}
// Parse parses the given input as a line-separated list of arguments.
// On success, a slice of argument lists is returned.
Parse parses the given input as a line-separated list of arguments.
On success, a slice of argument lists is returned.
// Parse parses the given input as a line - separated list of arguments . // On success a slice of argument lists is returned .
func Parse(input io.Reader) (commands []*Command, err error) {
	scanner := bufio.NewScanner(input)
	var currentToken token
	scanner.Split(tokenize(&currentToken))
	var tokens []token
	for scanner.Scan() {
		tokens = append(tokens, currentToken)
		if numTokens := len(tokens); numTokens > 1 {
			prevToken := tokens[numTokens-2]
			if mergedToken := prevToken.Merge(currentToken); mergedToken != nil {
				tokens[numTokens-2] = mergedToken
				tokens = tokens[:numTokens-1]
			}
		}
	}
	if err := scanner.Err(); err != nil {
		return nil, err
	}
	beginning := true
	var currentCommand *Command
	for _, token := range tokens {
		if token.Type() == tokenTypeWhitespace {
			continue 
		}
		if token.Type() == tokenTypeNewline {
			if !beginning { 
				commands = append(commands, currentCommand)
				currentCommand = nil
			}
			continue
		}
		if token.Type() == tokenTypeHeredoc {
			if currentCommand == nil {
				return nil, errors.New("unexpected heredoc")
			}
			currentCommand.Heredoc = token.Value()
			commands = append(commands, currentCommand)
			currentCommand = nil
			continue
		}
		if token.Type() != tokenTypeArg {
			return nil, errors.New("unexpected token")
		}
		beginning = false
		if currentCommand == nil {
			currentCommand = &Command{}
		}
		currentCommand.Args = append(currentCommand.Args, token.Value())
	}
	if currentCommand != nil {
		commands = append(commands, currentCommand)
	}
	return commands, nil
}
func Parse ( input io . Reader ) ( commands [ ] * Command , err error ) { scanner := bufio . NewScanner ( input ) var currentToken token scanner . Split ( tokenize ( & currentToken ) ) var tokens [ ] token for scanner . Scan ( ) { tokens = append ( tokens , currentToken ) if numTokens := len ( tokens ) ; numTokens > 1 { prevToken := tokens [ numTokens - 2 ] if mergedToken := prevToken . Merge ( currentToken ) ; mergedToken != nil { tokens [ numTokens - 2 ] = mergedToken tokens = tokens [ : numTokens - 1 ] } } } if err := scanner . Err ( ) ; err != nil { return nil , err } beginning := true var currentCommand * Command for _ , token := range tokens { if token . Type ( ) == tokenTypeWhitespace { continue } if token . Type ( ) == tokenTypeNewline { if ! beginning { commands = append ( commands , currentCommand ) currentCommand = nil } continue } if token . Type ( ) == tokenTypeHeredoc { if currentCommand == nil { return nil , errors . New ( " " ) } currentCommand . Heredoc = token . Value ( ) commands = append ( commands , currentCommand ) currentCommand = nil continue } if token . Type ( ) != tokenTypeArg { return nil , errors . New ( " " ) } beginning = false if currentCommand == nil { currentCommand = & Command { } } currentCommand . Args = append ( currentCommand . Args , token . Value ( ) ) } if currentCommand != nil { commands = append ( commands , currentCommand ) } return commands , nil }
Parse parses the given input as a line-separated list of arguments.
Parse parses the given input as a line - separated list of arguments .
// Ignore whitespace tokens. // handle leading newlines. // Newline signals the end of a command. // Heredoc also signals the end of a command. // Append arg to current command. // Handles case with no trailing newline.