Difference between revisions of "CoCoA:Grammar"

From ApCoCoAWiki
Line 19: Line 19:
 
  [[PACKAGE_DECL]] ::=
 
  [[PACKAGE_DECL]] ::=
 
       Package [[PACKAGE_ID]]
 
       Package [[PACKAGE_ID]]
         {{fopt|{{flist|[[EXPORT_DECL]] ,}}}}
+
         {{fopt|{{flist|[[EXPORT_DECL]]}}}}
         {{fopt|{{flist|[[VARIABLE_DECL]] ,}}}}
+
         {{fopt|{{flist|[[VARIABLE_DECL]]}}}}
 
         {{fopt|{{flist|[[FUNCTION_DECL]]}}}}
 
         {{fopt|{{flist|[[FUNCTION_DECL]]}}}}
 
       EndPackage
 
       EndPackage
  
  [[EXPORT_DECL]] ::= Export {{flist|[[IDENTIFIER]]}};
+
  [[EXPORT_DECL]] ::= Export {{flist|[[IDENTIFIER]] ,}};
  
  [[VARIABLE_DECL]] ::= Declare {{flist|{{fopt|[[TYPE]]}} [[IDENTIFIER]]}};
+
  [[VARIABLE_DECL]] ::= Declare {{flist|{{fopt|[[TYPE]]}} [[IDENTIFIER]] ,}};
  
 
  [[FUNCTION_DECL]] ::=
 
  [[FUNCTION_DECL]] ::=

Revision as of 13:56, 6 June 2007

Base grammar

A few rules to start the formal language definition.

PROGRAM ::= COMMAND | 
COMMAND ::= HELP_QUERY newline
   | COMMENT
   | PACKAGE_DECL
   | FUNCTION_DECL
   | STATEMENT;
HELP_QUERY ::= ? *
COMMENT ::= -- * newline
   | // * newline
   | /* * */
PACKAGE_DECL ::=
     Package PACKAGE_ID
       EXPORT_DECL
       VARIABLE_DECL
       FUNCTION_DECL
     EndPackage
EXPORT_DECL ::= Export IDENTIFIER ,;
VARIABLE_DECL ::= Declare TYPE IDENTIFIER ,;
FUNCTION_DECL ::=
     Define IDENTIFIER( PARAMS ) STATEMENTS EndDefine
   | Define IDENTIFIER( PARAMS ) BuiltIn
   | Define IDENTIFIER( PARAMS ) PlugIn
PARAMS ::= PARAM ,
PARAM ::= TYPE IDENTIFIER
STATEMENTS ::= STATEMENT ;
STATEMENT ::= 
   | ASSIGNMENT
   | EXPRESSION
   | FUNCTION_CALL
   | Return EXPRESSION
   | Print EXPRESSIONS
   | PrintLn EXPRESSIONS
   | If EXPRESSION Then STATEMENTS ELSE_LIST EndIf
   | While EXPRESSION Do STATEMENTS EndWhile
   | Repeat STATEMENTS Until EXPRESSION
   | For IDENTIFIER := EXPRESSION To EXPRESSION Step EXPRESSION
   	Do STATEMENTS EndFor
   | ForEach IDENTIFIER In EXPRESSION Do STATEMENTS EndForEach
   | Break
   | Block STATEMENTS EndBlock
   | Declare TYPE IDENTIFIER ,
   | Delete IDENTIFIER ,
   | Quit
ASSIGNMENT ::= LEFT_EXPRESSION := EXPRESSION
LEFT_EXPR ::= IDENTIFIER
	| LEFT_EXPR.IDENTIFIER
	| LEFT_EXPR.[EXPRESSION ,]
FUNCTION_CALL ::= FUNCTION_ID( EXPRESSION , )
FUNCTION_ID ::= IDENTIFIER | EXPRESSION.IDENTIFIER | PACKAGE_ID.IDENTIFIER