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Re: JavaCC : Invalid escape character...

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在 1998年10月14日星期三UTC+8下午3时00分00秒，Patrice Bonhomme写道：
> Hi there,
> 
> I use the ASCII_UCodeESC_CharStream class with JavaCC. When i try to parse this
> sequence of characters "\usepackage{fancyheadings}", i got this error :
> 
> java.lang.Error: Invalid escape character at line 1 column 2.
>         at fr.loria.xml.parser.ASCII_UCodeESC_CharStream.readChar(ASCII_UCodeESC_CharStream.java)
>         at fr.loria.xml.parser.ASCII_UCodeESC_CharStream.BeginToken(ASCII_UCodeESC_CharStream.java)
>         at fr.loria.xml.parser.ParserTokenManager.getNextToken(ParserTokenManager.java)
>         at fr.loria.xml.parser.Parser.jj_ntk(Parser.java)
>         at fr.loria.xml.parser.Parser.content(Parser.java)
>         at fr.loria.xml.parser.Parser.root(Parser.java)
>         at fr.loria.xml.parser.Parser.document(Parser.java)
>         at fr.loria.xml.parser.Parser.parse(Parser.java)
>         at fr.loria.xml.parser.Parser.parse(Parser.java)
> 
> 
> Is it a BUG ?
> 
> Within the The CharStream Classes MiniTutorial, i saw this :
> 
> This class treats the input as a stream of 1-byte characters. However, the
> special escape sequence
> 
>    ("\\\\")* "\\" ("u")+ - (odd number of backslahes followed by one or more
> 'u's.)
> 
> is treated as a tag indicating that the next 4 bytes following the tag will be
> hexadecimal digits forming a 4-digit hex number whose value will be treated as
> the value of the character at the position indicated by the first backslash.
> Note that this value can be anything in the range 0x0-0xffff. 
> 
> 
> I would like to keep the ASCII_UCodeESC_CharStream class within my parser. What
> do i have to do ?... Do i have to implement my own implementation of the
> CharStream interface ? Any help ?
> 
> Pat.
> -- 
>   ***********************************************************
>   * patrice.bonhomme@loria.fr     * Office : B.228          *
>   * http://www.loria.fr/~bonhomme * Phone  : 03 83 59 30 52 *
>   ***********************************************************

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Re: JavaCC : Invalid escape character... chenghaiming227@gmail.com - 2012-12-27 22:34 -0800

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