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package antlr_resource
import (
"unicode"
"github.com/antlr/antlr4/runtime/Go/antlr"
)
// CaseChangingStream wraps an existing CharStream, but upper cases, or
// lower cases the input before it is tokenized.
type CaseChangingStream struct {
antlr.CharStream
upper bool
}
// NewCaseChangingStream returns a new CaseChangingStream that forces
// all tokens read from the underlying stream to be either upper case
// or lower case based on the upper argument.
func NewCaseChangingStream(in antlr.CharStream, upper bool) *CaseChangingStream {
return &CaseChangingStream{in, upper}
}
// LA gets the value of the symbol at offset from the current position
// from the underlying CharStream and converts it to either upper case
// or lower case.
func (is *CaseChangingStream) LA(offset int) int {
in := is.CharStream.LA(offset)
if in < 0 {
// Such as antlr.TokenEOF which is -1
return in
}
if is.upper {
return int(unicode.ToUpper(rune(in)))
}
return int(unicode.ToLower(rune(in)))
}
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