package shell

import (
	"fmt"
	"io"
)

type LineParameters struct{}

func (p *LineParameters) SubParsers() []Parser {
	return []Parser{
		&BaseParser{
			parameters: &StatementParameters{},
		},
	}
}

func (p *LineParameters) Supports(charsBefore []rune, r rune) bool {
	return true
}

func (p *LineParameters) ShouldLeave(charsBefore []rune, r rune) bool {
	if r == '\n' {
		return countBackslashSuffixes(charsBefore)%2 == 0
	}

	return false
}

func (p *LineParameters) MakeToken() Token {
	return &Line{}
}

type Line struct {
	BaseToken
}

func (l *Line) Evaluate(state State, stdin io.Reader, stdout io.Writer, stderr io.Writer) uint8 {
	var retval uint8 = 0

	for _, token := range l.Tokens() {
		if eval, ok := token.(Evalable); ok {
			retval = eval.Evaluate(state, stdin, stdout, stderr)
		} else {
			stderr.Write([]byte(
				fmt.Sprintf(
					"shell: Syntax error near unexpected token: %s",
					token.String(),
				),
			))
		}
	}

	return retval
}