Hi all,

Just out of curiousity, since I am developing DDoc (and just got the expressions going more or less) I did hit an interesting point. Right now I am using Yacc to extract all D grammar (since I need the comments as well). Then I'll pass it through to a D class tree.

However, I feel more and more that something similar as Yacc should be available for D. Perhaps even using OOP.

I was thinking of things like the following:

------------------------------------------------------------------------

Start:
	ProtectionAttribute Identifier ';'

ProtectionAttribute:
	'public'
	|
	'private'
	|
	'protected'
	|
	'package'
	|
	'extern'
	|
	'extern' '(' Indentifier ')'

Identifier:
	'[_[:ALPHA:]][_[:ALNUM:]]'

------------------------------------------------------------------------

It could very well be possible to both allow Interactive parsing as Non-interactive parsing, in which an object tree is made. In this case the following could be possible:

------------------------------------------------------------------------

class Start {
	ProtectionAttribute varProtectionAttribute1_1;
	Identifier varIdentifier1_2;
	int rule;
	
	bit isRule(int i) {
		return (rule == i);
	}

	ProtectionAttribute getProtectionAttribute1_1() {
		return varProtectionAttribute1_1;
	}

	Identifier getIdentifier1_2() {
		return varIdentifier1_2;
	}
}

class ProtectionAttribute {
	char[][] match1_1;	// 'public'
	char[][] match2_1;	// 'private'
	char[][] match3_1;	// 'protected'
	char[][] match4_1;	// 'package'
	char[][] match5_1;	// 'extern'
	char[][] match6_1;	// 'extern'
	char[][] match7_2;	// '('
	Identifier varIdentifier8_3;
	char[][] match9_4;	// ')'

	int rule;
	
	bit isRule(int i) {
		return (rule == i);
	}

	char[][] getMatch1_1() {
		return match1_1;
	}

	//
	// *** Etc... ***
	//

	char[][] getMatch9_4() {
		return match9_4;
	}


}

class Identifier {
	char[][] match1_1;	'[_[:ALPHA:]][_[:ALNUM:]]'
	int rule;
	
	bit isRule(int i) {
		return (rule == i);
	}

	char[][] getMatch1_1() {
		return match1_1;
	}
}

------------------------------------------------------------------------

Regards,
Sjoerd

Sjoerd van Leent wrote:
<snip>
> However, I feel more and more that something similar as Yacc should be available for D. Perhaps even using OOP.

This was discussed a while back:

http://www.digitalmars.com/drn-bin/wwwnews?digitalmars.D/4351

Stewart.