[antlr-interest] Problems with Pre-processing instructions of C#

[Eduard Ralph]

Hi community,

I'm fighting with the processing of pre-processing instructions according to C# specs. The BNF is:

Whitespace(opt) '#' Whitespace(opt) 'error' input-characters
Whitespace(opt) '#' Whitespace(opt) 'warning' input-characters
Whitespace(opt) '#' Whitespace(opt) 'line'  ...

where
 Whitespace(opt) can be optionally one or more spaces ('\u0020','\u00A0', and a few more)
 Input-characters is anything except newline ('\n', and a few more)

I wrote in the Lexer, where the other rules are fragments


PP_DIAGNOSTIC      :        (WHITESPACE* HASH WHITESPACE* 'error')=>WHITESPACE* HASH WHITESPACE* ERROR INPUT_CHARACTER*
                            |        (WHITESPACE* HASH WHITESPACE* 'warning')=>WHITESPACE* HASH WHITESPACE* WARNING INPUT_CHARACTER*
                            ;


PP_LINE                 :        (WHITESPACE* HASH WHITESPACE* 'line')=> WHITESPACE* HASH WHITESPACE* LINE PP_LINE_INDICATOR NEWLINE
                            ;

fragment PP_LINE_INDICATOR      :        INTEGER_LITERAL PP_FILE_NAME?
                                               |        IDENTIFIER_OR_KEYWORD
                                               ;

fragment PP_FILE_NAME              :        STRING_LITERAL
                                               ;

fragment HASH                          :        '#';


Unfortunately the DFA in the Lexer doesn't recognize correctly which Lexer rule applies and now I'm wondering why this is so. Some thoughts and help would be greatly appreciated.

Thanks in advance,

Eduard
________________________________
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