[antlr-interest] Re: Updated C++ parser

[atripp54321]

Ric,
Thanks for releasing that.
I also wanted to deal with preprocessor stuff in within Monty's
C grammar. There are a couple of "gotchas": mult-line preprocessor
directives and the dreaded "##" operator. Below is what I have.
Andy

protected RestOfPP :
( 
	'\\'! Newline!	// note the "!"s to delete escaped newlines
	| Comment
	| CharLiteral// 6/11/04: avoid matching '"' as StringLiteral
	| StringLiteral	//without this, "//" inside string gets processed
	| {LA(2) != '*' && LA(2) != '/'}? '/'
	| '#'			// "stringification"
	| ~('\r' | '\n' | '/')
)+ 
;

// PPSpaceRule will convert "# define" to "#define", etc.
PPspace		: "#" (Whitespace)+ RestOfPP
;
PPdefine	: "#define" (Whitespace)+ RestOfPP
;
PPif		: "#if" (Whitespace)+ RestOfPP
;
PPelse		: "#else" 
;
PPelif		: "#elif" (Whitespace)+ RestOfPP
;
PPendif		: "#endif"
;
// Note the "*" instead of "+" here, to handle "#include<whatever.h>"
PPinclude	: "#include" (Whitespace)* RestOfPP
;
PPifdef		: "#ifdef" (Whitespace)+ RestOfPP
;
PPifndef	: "#ifndef" (Whitespace)+ RestOfPP
;
PPundef		: "#undef" (Whitespace)+ RestOfPP
;
PPpragma	: "#pragma" RestOfPP
;
PPerror		: "#error" RestOfPP
;
PPline		: "#line" RestOfPP
;



 
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