package ddl

import (
	"github.com/antlr4-go/antlr/v4"
	"unicode"
)

type CaseChangingStream struct {
	antlr.CharStream
	upper bool
}

func newCaseChangingStream(in antlr.CharStream, upper bool) *CaseChangingStream {
	return &CaseChangingStream{
		in,
		upper,
	}
}
func (is *CaseChangingStream) LA(offset int) int {
	in := is.CharStream.LA(offset)
	if in < 0 {
		return in
	}
	if is.upper {
		return int(unicode.ToUpper(rune(in)))
	} else {
		return int(unicode.ToLower(rune(in)))
	}
}