Readers return -1 when the end of the stream, has been reached, and so does SourceReader. SourceReader will also return other special negative values to indicate a tag substitution. ENTER_CODE is returned to indicate that characters read are in source code, and ENTER_TEXT is returned to indicate that characters read are in plain text. The first character read from a SourceReader is either ENTER_CODE or ENTER_TEXT; @author Brian S O'Neill @version 18 , 4/26/01
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