-- The different sections of a TCS model have been enclosed between BEGIN and END
-- comments below. Additional information is provided below each BEGIN comment.
-- The main sections of interest are "Class templates", and
-- "Operator table" (only for DSLs using operators).
syntax RSL {

-- BEGIN Primitive templates
-- Specifies representation of primitive types.
-- Only needs modification when default lexer is not satisfactory.
-- Generally modified along with the lexer.
	primitiveTemplate identifier for String default using NAME:
		value = "%token%";

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

	primitiveTemplate treeFragmentSymbol for String using TREEFRAGMENT:
		value = "%token%";

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

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

-- BEGIN Class templates
-- Specifies representation of classes.
-- This is the main section to work on.
	template RSL main
		:	[domain rslelems ] {nbNL = 2,indentIncr = 0, startNL = false} 
		    [ruleset]{nbNL = 1,indentIncr = 0} 
		;
	template RSLelements abstract;
	
	template Domain 
		:	"default" "base" "domain" dname "."
		;

	template ExternalPattern 
		:	 "external" "pattern" phead ":" 
		     ptoken ["="] {nbNL = 1,indentIncr = 1} eptext {as = stringSymbol} "in" "domain" dname "."		     
		;

	template Pattern abstract
		:	 "pattern" phead ":"
		     ptoken  ["=" ptext  "."]
		;

	template PatternText abstract;

	template SimplePatternText
		:    ptext{as = treeFragmentSymbol}
		;
	template ConditionalPatternText
		:	 ptext "if" pref		     
		;
		
	template PatternHead 
		:	name "(" params{separator = ","} ")" 
		;
		
	template PatternParameter
		: name ":" referTo
		;

	template Condition 
		:	"external" "condition" chead 
		     "=" ctext {as = stringSymbol} "."
		;

	template ConditionHead 
		:	name "(" [params{separator = ","} ")"] {indentIncr = 1}
		;
		
	template ConditionParameter
		: name ":" referTo
		;

	template Rule 
		:	"rule" rname "(" 
			 [params{separator = ","} ")"]{indentIncr = 1} ":" 
			 [type "->" type]  "=" 
		     [r_lhs_pattern]  "->"
			 [r_rhs_pattern "."]
		;

	template RuleParameter
		: name ":" referTo
		;
		
	template RuleLHS
		:  ruletext
		;

	template RuleRHS
		:  ruletext [condition] {indentIncr = 0}
		;
		
	template RuleText abstract;
	
	template SimpleRuleText
		:   text{as = treeFragmentSymbol}
		;
		
	template IDRuleText
		:   text
		;
		
	template ComplexRuleText
		:   pref  
		;
    
	template RuleCondition abstract;
	
	
	template RuleEqCondition
		:	"if" lhs "==" pref
		;		

	template RuleNotEqCondition
		:	"if" lhs "~=" pref
		;		

	template Parameter abstract;

	template PatternRef
		:	name "(" params{separator = ","} ")" 
		;				
	
	template RealParameter
		: name
		;
		
	template RuleSet 
		:	"public" "ruleset" rsname "=" "{" rname {separator = ","} "}" "."
		    
		;
-- END Class templates

-- BEGIN Special symbols
-- Possible modifications:
--	- Addition of new symbols.
--	- Modification of spaces information.
--	- Removal of unused symbols so that using these symbols results in lexical
--	error rather than parsing error.
	symbols {
		lsquare		= "[";
		rsquare		= "]"	: rightSpace;
		excl		= "!";
		coma		= ","	: leftNone, rightSpace;
		lparen		= "(";
		rparen		= ")"	: leftNone, rightSpace;
		lcurly		= "{"	: leftSpace;
		rcurly		= "}"	: leftNone, rightSpace;
		semi		= ";"	: leftNone, rightSpace;
		colon		= ":"	: leftSpace, 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;
	}
-- END Special symbols

-- BEGIN Operator table
-- Defines all operators with their priority, arity, and associativity.
-- All defined operators must be used in operator templates.

-- No operator in SampleDSL. The Calc<n> DSLs may be used as examples.

-- END Operator table


-- BEGIN Lexer
-- Specifies the lexical entities.
-- Only needs modification when default lexer is not satisfactory.
-- Generally modified along with Primitive templates.
	token COMMENT	: endOfLine(start = "--");
	
	token TREEFRAGMENT	: 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*	;

%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));}
	;

	";
-- END Lexer

}