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-- @authors		Frédéric Jouault
-- @date		2007/07/25
-- @description	This TCS model defines the syntax of the ACG language.
syntax ACG {

	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 = "ei.unescapeString(%token%, 1)",
		serializer="'\'' + %value%.toCString() + '\''";

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

	template ACG main
		:	"acg" metamodel "startsWith" startsWith "{" [
				elements
			] "}"
		;

	template ACGElement abstract;

	template Function
		:	"function" context "::" name
				"(" (isDefined(parameters) ? parameters{forcedLower = 1, separator = ","} ) ")" "="
				body ";"
		;

	template Attribute
		:	"attribute" context "::" name "="
				body ";"
		;

	template Parameter addToContext
		:	name
		;

-- @begin Nodes
	template Node abstract;

	template ASMNode context
		:	"asm" element "name" name
-- NO mode or guard for ASMNodes:
--			(isDefined(mode) ?
--				"mode" mode
--			)
--			(isDefined(guard) ? "|" guard)
			"{" [
				statements
			] "}"
		;

	template CodeNode context
		:	"code" element
			(isDefined(mode) ?
				"mode" mode
			)
			(isDefined(guard) ? "|" guard)
			"{" [
				statements
			] "}"
		;

	template SimpleNode context
		:	element
			(isDefined(mode) ?
				"mode" mode
			)
			(isDefined(guard) ? "|" guard)
			"{" [
				statements
			] "}"
		;
-- @end Nodes

-- @begin Statements
	template Statement abstract;

-- @begin CompoundStats
	template CompoundStat(disambiguate = "(\"if\" LPAREN expression RPAREN LCURLY) | \"foreach\" | \"variable\" | \"operation\" | LSQUARE | \"let\" | \"analyze\"") abstract context;

	template ForEachStat context
		:	"foreach" "(" iterator "in" collection ")" "{" [
				statements
			] "}"
		;

	template OnceStat
		:	"[" [
				statements
			] "]"
		;

	template VariableStat
		:	"variable" definition "named" name "{" [
				statements
			] "}"
		;

	template OperationStat context
		:	"operation" "context" context "name" name "{" [
				statements
			] "}"
		;

	template ConditionalStat
		:	"if" "(" condition ")" "{" [
				statements
			] "}"
			(isDefined(elseStatements) ?
				"else" "{" [
					elseStatements
				] "}"
			)
		;

	template LetStat context
		:	"let" variable "=" value "{" [
				statements
			] "}"
		;

	template AnalyzeStat
		:	"analyze" target
			(isDefined(mode) ?
				"mode" mode
			)
			(isDefined(statements) ?
				"{" [
					statements
				] "}"
			)
		;
-- @end CompoundStats

	template ReportStat
		:	"report" severity message
		;

	enumerationTemplate Severity
		:	#critic		= "critic",
			#error		= "error",
			#warning	= "warning"
		;

	template FieldStat
		:	"field" name ":" type
		;

	template ParamStat
		:	"param" name ":" type
		;

-- @begin EmitStats
	template EmitStat abstract;

	template LabelStat addToContext
		:	name (isDefined(id) ? "(" id ")") ":"
		;

	template NewStat
		:	"new"
		;
		
	template NewinStat
		:	"newin"
		;

	template DeleteStat
		:	"delete"
		;

	template DupStat
		:	"dup"
		;

	template DupX1Stat
		:	"dup_x1"
		;

	template PopStat
		:	"pop"
		;

	template SwapStat
		:	"swap"
		;

	template IterateStat
		:	"iterate"
		;

	template EndIterateStat
		:	"enditerate"
		;

	template GetAsmStat
		:	"getasm"
		;

	template FindMEStat
		:	"findme"
		;

	template PushTStat
		:	"pusht"
		;

	template PushFStat
		:	"pushf"
		;

-- @begin EmitWithOperandStats
	template EmitWithOperandStat abstract;

	template PushStat
		:	"push" operand
		;

	template PushIStat
		:	"pushi" operand
		;

	template PushDStat
		:	"pushd" operand
		;

	template LoadStat
		:	"load" operand
		;

	template StoreStat
		:	"store" operand
		;

	template CallStat
		:	"call" operand
		;

	template PCallStat
		:	"pcall" operand
		;

	template SuperCallStat
		:	"supercall" operand
		;

	template GetStat
		:	"get" operand
		;

	template SetStat
		:	"set" operand
		;
-- @end EmitWithOperandStats

-- @begin EmitWithLabelRefStats
	template EmitWithLabelRefStat abstract;

	template GotoStat
		:	"goto" label{refersTo = name}
		;

	template IfStat
		:	"if" label{refersTo = name}
		;
-- @end EmitWithLabelRefStats
-- @end EmitStats
-- @end Statements

	template VariableDecl addToContext
		:	name
		;

-- @begin Expressions
	template Expression abstract operatored;

	template VariableExp
		:	variable{refersTo = name}
		;

	template SelfExp
		:	"self"
		;

	template LastExp
		:	"last"
		;

	template IfExp
		:	"if" condition "then" thenExp "else" elseExp "endif"
		;

	operatorTemplate IsAExp(operators = opIsa, source = 'source')
		:	type
		;

	template LetExp context nonPrimary
		:	"let" variable "=" value "in" in
		;

-- @begin PropertyCallExps
	operatorTemplate NavigationExp(operators = opPoint, source = 'source')
		:	name{as = identifierOrKeyword}
		;

	operatorTemplate IteratorExp(operators = opRarrow, source = 'source') context
		:	name{as = identifierOrKeyword} "(" iterator "|" body ")"
		;

	operatorTemplate OperationCallExp(operators = opPoint, source = 'source')
		:	name {as = identifierOrKeyword} "(" arguments{separator = ","} ")"
		;

	operatorTemplate OperatorCallExp(operators =
			opNot opMinus1
			opStar opSlash opDiv opMod
			opPlus opMinus2
			opEq opGt opLt opGe opLe opNe
			opAnd opOr opXor opImplies,
			source = 'source', storeOpTo = name, storeRightTo = arguments);
-- @end PropertyCallExps

-- @begin LiteralExps
	template LiteralExp abstract;

	template OclUndefinedExp
		:	"OclUndefined"
		;

-- @begin CollectionExps
	template CollectionExp abstract;

	template SequenceExp
		:	"Sequence" "{" elements{separator = ","} "}"
		;
-- @end CollectionExps

-- @begin Primitive LiteralExps
	template BooleanExp
		:	(value ? "true" : "false")
		;

	template IntegerExp
		:	value
		;

	template StringExp
		:	value{as = stringSymbol}
		;
-- @end Primitive LiteralExps
-- @end LiteralExps
-- @end Expressions

	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;
	}

	operators {
		priority 0 {	-- 0 is highest
			opPoint = point, 2;
			opRarrow = rarrow, 2;
		}

		priority 1 {
			opNot = "not", 1;		-- no corresponding symbol => symbol is the keyword defined by the quoted string (which is also the name)
			opMinus1 = minus, 1;
		}

		priority 2 {
			opStar = star, 2;
			opSlash = slash, 2;
			opDiv = "div", 2;
			opMod = "mod", 2;
		}

		priority 3 {
			opPlus = plus, 2;
			opMinus2 = minus, 2;
		}

		priority 4 {
			opEq = eq, 2;
			opGt = gt, 2;
			opLt = lt, 2;
			opGe = ge, 2;
			opLe = le, 2;
			opNe = ne, 2;
			opIsa = "isa", 2;
		}

		priority 5 {
			opAnd = "and", 2;
			opOr = "or", 2;
			opXor = "xor", 2;
			opImplies = "implies", 2;
		}
	}

	token COMMENT	: endOfLine(start = "--");
	token STRING	: multiLine(start = "\'", end = "\'", esc = "\\");

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

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);
				}
		)
	;
	";

}