te/token.go at main · pnelson/te · GitHub

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package te

import "fmt"

type tokenType int

const (
	tokenAnd tokenType = iota
	tokenAt
	tokenColon
	tokenDaily
	tokenDigit
	tokenError
	tokenEvery
	tokenEOF
	tokenHourly
	tokenIn
	tokenLast
	tokenMidnight
	tokenNoon
	tokenOf
	tokenOn
	tokenOrdinal
	tokenThe
	tokenTwelveHour
	tokenWeekday
	tokenWeekly
	tokenMonth
	tokenMonthly
	tokenQuarterly
	tokenUnitDay
	tokenUnitHour
	tokenUnitMinute
	tokenUnitMonth
	tokenUnitSecond
	tokenUnitWeek
	tokenUnitYear
	tokenYearly
)

const eof = rune(-1)

type token struct {
	typ tokenType
	val string
}

func (t token) String() string {
	switch t.typ {
	case tokenError:
		return t.val
	case tokenEOF:
		return "EOF"
	}
	return fmt.Sprintf("%q", t.val)
}

type parseError struct {
	token   token
	message string
}

func (e parseError) Error() string {
	return fmt.Sprintf("%s, token: %q", e.message, e.token.val)
}

func newParseError(t token, message string) parseError {
	return parseError{t, message}
}