[ragel-users] making \n, \t etc printable

[Adrian Thurston]

Thanks, I applied it and added \a and \v.

One other character I'd like to change is 32. Printing it as ' ' looks a 
little strange sometimes. I'm thinking of changing it to SP instead.

-Adrian

Arne Goedeke wrote:
> hey!
> 
> I thought it would be nice for most people to have \n, \t and such
> being printed out by rlcodegen -Vp using backslash escapes. here is my
> patch:
> 
> --- common/common.h	2007-01-21 23:58:22.000000000 +0100
> +++ common/common.h	2007-02-08 23:24:29.000000000 +0100
> @@ -60,7 +60,11 @@
> 
>  	bool isUpper() const { return ( 'A' <= key && key <= 'Z' ); }
>  	bool isLower() const { return ( 'a' <= key && key <= 'z' ); }
> -	bool isPrintable() const { return ( 32 <= key && key < 127 ); }
> +	bool isPrintable() const
> +	{
> +	    return ( 32 <= key && key < 127 ) || key == '\b' || key == '\t'
> +		    || key == '\n' || key == '\f' || key == '\r';
> +	}
> 
>  	Key toUpper() const
>  		{ return Key( 'A' + ( key - 'a' ) ); }
> --- rlcodegen/gvdotgen.cpp	2007-01-21 23:58:22.000000000 +0100
> +++ rlcodegen/gvdotgen.cpp	2007-02-08 23:24:36.000000000 +0100
> @@ -47,6 +47,21 @@
>  			case '"': case '\\':
>  				out << "\\" << cVal;
>  				break;
> +			case '\n':
> +				out << "\\\\n";
> +				break;
> +			case '\t':
> +				out << "\\\\t";
> +				break;
> +			case '\r':
> +				out << "\\\\r";
> +				break;
> +			case '\b':
> +				out << "\\\\b";
> +				break;
> +			case '\f':
> +				out << "\\\\f";
> +				break;
>  			default:
>  				out << cVal;
>  				break;
> 
> 
>