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-- @authors		Frédéric Jouault
-- @date		2007/05/28
-- @description	This TCS model defines the syntax of the XML2 language.
syntax XML2 {

	primitiveTemplate identifier for String default using NAME:
		value = "%token%";

	primitiveTemplate identifierOrKeyword for String using NAME orKeyword:
		value = "%token%";

	primitiveTemplate stringSymbol for String using STRING:
		value = "%token%",
		serializer="'\'' + %value%.toCString() + '\''";

	primitiveTemplate integerSymbol for Integer default using INT:
		value = "Integer.valueOf(%token%)";

	primitiveTemplate floatSymbol for Double default using FLOAT:
		value = "Double.valueOf(%token%)";

	template Root main
		:	$elementContents
		;
		
	-- duplicate features:
	--	- name:
	--		- this will (more or less) work for injection (no check if name is the same though)
	--		- this works for extraction
	function elementContents(Element)
		:	"<" (isDefined(prefix) ? prefix ":") name attributes
			(isDefined(children) ? ">" [
					children
				] "<" "/" (isDefined(prefix) ? prefix ":") name ">"
			:
				"/" ">"
			)
		;

	template Element
		:	$elementContents
		;

	template Node abstract;
	
	template Attribute
		:	(isDefined(prefix) ? prefix ":") name "=" value{as = stringSymbol}
		;

	symbols {
		lsquare		= "[";
		rsquare		= "]"	: rightSpace;
		excl		= "!";
		coma		= ","	: leftNone, rightSpace;
		lparen		= "(";
		rparen		= ")"	: leftNone, rightSpace;
		lcurly		= "{"	: leftSpace;
		rcurly		= "}"	: leftNone, rightSpace;
		semi		= ";"	: leftNone, rightSpace;
		colon		= ":"	: leftSpace, rightSpace;	-- except after def where it is leftNone, rightSpace
		pipe		= "|"	: leftSpace, rightSpace;
		sharp		= "#"	: leftSpace;
		qmark		= "?";
		coloncolon	= "::"	: leftNone, rightNone;

		-- operator symbols
		point		= "."	: leftNone;
		rarrow		= "->"	: leftNone;
		minus		= "-"	: leftSpace, rightSpace;
		star		= "*"	: leftSpace, rightSpace;
		slash		= "/"	: leftSpace, rightSpace;
		plus		= "+"	: leftSpace, rightSpace;
		eq		= "="	: leftSpace, rightSpace;
		gt		= ">"	: leftSpace, rightSpace;
		lt		= "<"	: leftSpace, rightSpace;
		ge		= ">="	: leftSpace, rightSpace;
		le		= "<="	: leftSpace, rightSpace;
		ne		= "<>"	: leftSpace, rightSpace;
		larrow		= "<-"	: leftSpace, rightSpace;
	}

	token COMMENT	: multiLine(start = "<!--", end = "-->");
	
	lexer = "
%options testLiterals = false;
NL
	:	(	'\\r' '\\n'
		|	'\\n' '\\r'	//Improbable
		|	'\\r'
		|	'\\n'
		)
	{newline();}
	;

WS
	:	(	' '
		|	'\\t'
		)
	;

%protected
DIGIT
	:	'0'..'9'
	;

%protected
ALPHA
	:	'a'..'z'
	|	'A'..'Z'
	|	'_'
	//For Unicode compatibility (from 0000 to 00ff)
	|	'\\u00C0' .. '\\u00D6'
	|	'\\u00D8' .. '\\u00F6'
	|	'\\u00F8' .. '\\u00FF'
	;

%protected
SNAME
%v2	options {
%v2		testLiterals = true;
%v2	}
	:	(ALPHA) (ALPHA | DIGIT)*
;

NAME
	:	
%v3			SNAME
%v2			s:SNAME {if(s.getType() != SNAME) $setType(s.getType());}
	;

INT
	:	(DIGIT)+
%v2		(('.' DIGIT)=> '.' (DIGIT)+ {$setType(FLOAT);})?
	;

%v3	FLOAT	:	DIGIT+ (('.' DIGIT)=>'.' DIGIT+)?	;	// cannot accept DIGIT '.' because it would conflict with Navigation

%protected
ESC
	:	'\\\\'!
		(	'n' %v2{%setText(\"\\n\");}
		|	'r' %v2{%setText(\"\\r\");}
		|	't' %v2{%setText(\"\\t\");}
		|	'b' %v2{%setText(\"\\b\");}
		|	'f' %v2{%setText(\"\\f\");}
		|	'\"' %v2{%setText(\"\\\"\");}
		|	'\\'' %v2{%setText(\"\\'\");}
		|	'\\\\' %v2{%setText(\"\\\\\");}
		|	(
				('0'..'3')
				(
%v2					options {
%v2						warnWhenFollowAmbig = false;
%v2					}
				:	('0'..'7')
					(
%v2						options {
%v2							warnWhenFollowAmbig = false;
%v2						}
					:	'0'..'7'
					)?
				)?
			|	('4'..'7')
				(
%v2					options {
%v2						warnWhenFollowAmbig = false;
%v2					}
				:	('0'..'7')
				)?
			)
				{
%v2					String s = %getText;
%v2					int i;
%v2					int ret = 0;
%v2					String ans;
%v2					for (i=0; i<s.length(); ++i)
%v2						ret = ret*8 + s.charAt(i) - '0';
%v2					ans = String.valueOf((char) ret);
%v2					%setText(ans);
				}
		)
	;

STRING
	:	('\\''!
		(	ESC
		|	'\\n' {newline();}
		|	~('\\\\'|'\\''|'\\n')
		)*
		'\\''!
%v3		{setText(ei.unescapeString(getText(), 1));}
		|	'\"'!
			(	ESC
			|	'\\n' {newline();}
			|	~('\\\\'|'\\\"'|'\\n')
			)*
			'\"'!
%v3			{setText(ei.unescapeString(getText(), 1));}
		)
		
	;
	";

}