package parser

import "github.com/mmakaay/toml/parsekit"

// Item types that are produced by this parser.
const (
	ItemComment    parsekit.ItemType = iota // Comment string
	ItemKey                                 // Key of a key/value pair
	ItemKeyDot                              // Dot for a dotted key
	ItemAssignment                          // Value assignment coming up (=)
	ItemString                              // A value of type string
)

var (
	c                    = parsekit.C
	space                = c.Rune(' ')
	tab                  = c.Rune('\t')
	carriageReturn       = c.Rune('\r')
	lineFeed             = c.Rune('\n')
	hash                 = c.Rune('#')
	underscore           = c.Rune('_')
	dash                 = c.Rune('-')
	equal                = c.Rune('=')
	dot                  = c.Rune('.')
	singleQuote          = c.Rune('\'')
	doubleQuote          = c.Rune('"')
	any                  = c.Any()
	anyQuote             = c.AnyOf(singleQuote, doubleQuote)
	backslash            = c.Rune('\\')
	asciiLower           = c.RuneRange('a', 'z')
	asciiUpper           = c.RuneRange('A', 'Z')
	digit                = c.RuneRange('0', '9')
	whitespace           = c.OneOrMore(c.AnyOf(space, tab))
	whitespaceOrNewlines = c.OneOrMore(c.AnyOf(space, tab, carriageReturn, lineFeed))
	optionalWhitespace   = c.Optional(whitespace)
	endOfLine            = c.AnyOf(lineFeed, c.Rune(parsekit.EOF))
)

// NewParser creates a new parser, using the provided input string
// as the data to parse.
func NewParser(input string) *parsekit.P {
	return parsekit.New(input, startKeyValuePair)
}