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package main
// Simple lexem stack implementation.
import "go.neonxp.ru/unilex"
type lexemStack []unilex.Lexem
func (ls *lexemStack) Head() (l unilex.Lexem) {
if len(*ls) == 0 {
return unilex.Lexem{Type: unilex.LexEOF}
}
return (*ls)[len(*ls)-1]
}
func (ls *lexemStack) Push(l unilex.Lexem) {
*ls = append(*ls, l)
}
func (ls *lexemStack) Pop() (l unilex.Lexem) {
if len(*ls) == 0 {
return unilex.Lexem{Type: unilex.LexEOF}
}
*ls, l = (*ls)[:len(*ls)-1], (*ls)[len(*ls)-1]
return l
}
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