package parser

import (
	"strings"

	"asciigoat.org/core/lexer"
)

var (
	// IsNewLine tells if a rune represents a line break or the start of one
	IsNewLine = lexer.NewIsIn("\n\r")
	// IsNotNewLine tells if a rune is anything other than line breaks
	IsNotNewLine = lexer.NewIsNot(IsNewLine)
	// IsNotSpace tells if a rune is anything other than whitespace
	IsNotSpace = lexer.NewIsNot(lexer.IsSpace)
	// IsSpace tells if a rune is considered whitespace by unicode
	IsSpace = lexer.IsSpace

	IsCommentStart = lexer.NewIsIn(";#")
)

// IsSpaceNotNewLine indicates a rune is whitespace but not a new line
func IsSpaceNotNewLine(r rune) bool {
	return IsSpace(r) && !IsNewLine(r)
}

func IsSectionStart(r rune) bool {
	return r == '['
}

func IsName(r rune) bool {
	switch {
	case IsSpace(r):
		return false
	case strings.ContainsRune("=\"'[];#", r):
		return false
	default:
		return true
	}
}