%{
//
// Mono.MonoBASIC.Parser.cs (from .jay): The Parser for the MonoBASIC compiler
//
// Author: A Rafael D Teixeira (rafaelteixeirabr@hotmail.com)
//
// Licensed under the terms of the GNU GPL
//
// Copyright (C) 2001 A Rafael D Teixeira
//
// TODO:
//	Nearly everything
//

namespace Mono.MonoBASIC
{
	using System.Text;
	using System;
	using System.Collections;
	using Mono.Languages;
	using Mono.CSharp;

	/// <summary>
	///    The MonoBASIC Parser
	/// </summary>
	public class Parser : GenericParser 
	{
	
/*
		/// <summary>
		///   Current block is used to add statements as we find
		///   them.  
		/// </summary>
		Block      current_block;

		/// <summary>
		///   Current interface is used by the various declaration
		///   productions in the interface declaration to "add"
		///   the interfaces as we find them.
		/// </summary>
		Interface  current_interface;

		/// <summary>
		///   This is used by the unary_expression code to resolve
		///   a name against a parameter.  
		/// </summary>
		Parameters current_local_parameters;

		/// <summary>
		///   Using during property parsing to describe the implicit
		///   value parameter that is passed to the "set" accessor
		///   method
		/// </summary>
		Parameter [] implicit_value_parameters;

*/
		bool UseExtendedSyntax; // for ".mbs" files

		public override string[] extensions()
		{
			string [] list = { ".vb", ".mbs" };
			return list;
		}

%}

%token EOF
%token NONE   /* This token is never returned by our lexer */
%token ERROR  // This is used not by the parser, but by the tokenizer.
	      // do not remove.

/*
 *These are the MonoBASIC keywords
 */
%token ADDHANDLER
%token ADDRESSOF
%token ALIAS
%token AND
%token ANDALSO
%token ANSI
%token AS
%token ASSEMBLY
%token AUTO
%token BOOLEAN	
%token BYREF
%token BYTE
%token BYVAL	
%token CALL
%token CASE	
%token CATCH	
%token CBOOL
%token CBYTE
%token CCHAR	
%token CDATE
%token CDEC
%token CDBL
%token CHAR	
%token CINT
%token CLASS
%token CLNG
%token COBJ
//%token COMPARE	
%token CONST	
%token CSHORT	
%token CSNG
%token CSTR
%token CTYPE
%token DATE
%token DECIMAL	
%token DECLARE
%token DEFAULT	
%token DELEGATE	
%token DESCRIPTION // MonoBASIC extension
%token DIM
%token DO	
%token DOUBLE	
%token EACH	
%token ELSE
%token ELSEIF
%token END	
%token ENUM	
%token EOL
%token ERASE
%token ERROR
%token EVENT
%token EXIT	
//%token EXPLICIT	
%token FALSE	
%token FINALLY	
%token FOR	
%token FRIEND
%token FUNCTION
%token GET
%token GETTYPE
%token GOTO	
%token HANDLES
%token IF	
%token IMPLEMENTS
%token IMPORTS	
%token IN	
%token INHERITS
%token INTEGER	
%token INTERFACE
%token IS
%token LET
%token LIB	
%token LIKE	
%token LONG	
%token LOOP
%token ME
%token MOD
%token MODULE
%token MUSTINHERIT	
%token MUSTOVERRIDE
%token MYBASE
%token MYCLASS
%token NAMESPACE
%token NEW
%token NEXT	
%token NOT
%token NOTHING
%token NOTINHERITABLE
%token NOTOVERRIDABLE
%token OBJECT	
%token ON
%token OPTION	
%token OPTIONAL	
%token OR
%token ORELSE
%token OVERLOADS
%token OVERRIDABLE	
%token OVERRIDES	
%token PARAMETER // MonoBASIC extension
%token PARAM_ARRAY
%token PRESERVE
%token PRIVATE	
%token PROPERTY
%token PROTECTED
%token PUBLIC
%token RAISEEVENT
%token READONLY	
%token REDIM
%token REM
%token REMOVEHANDLER
%token RESUME	
%token RETURN	
%token SELECT
%token SET
%token SHADOWS
%token SHARED
%token SHORT	
%token SINGLE
%token SIZEOF	
%token STATIC	
%token STEP
%token STOP
%token STRING	
%token STRUCTURE	
%token SUB
%token SUMMARY // MonoBASIC extension
%token SYNCLOCK
%token THEN
%token THROW
%token TO
%token TRUE	
%token TRY	
%token TYPEOF	
%token UNICODE
%token UNTIL
%token VARIANT	
%token WHEN	
%token WHILE	
%token WITH
%token WITHEVENTS
%token WRITEONLY
%token XOR

/* MonoBASIC single character operators/punctuation. */
%token OPEN_BRACKET  "["
%token CLOSE_BRACKET "]"
%token OPEN_PARENS   "("
%token CLOSE_PARENS  ")"
%token DOT           "."
%token COMMA         ","
%token COLON         ":"

%token PLUS           "+"
%token MINUS          "-"
%token ASSIGN         "="
%token OP_LT          "<"
%token OP_GT          ">"
%token STAR           "*"
%token PERCENT        "%"
%token DIV            "/"
%token OP_EXP         "^"
%token INTERR         "?"
%token OP_IDIV        "\\"
%token OP_CONCAT      "&"

/* MonoBASIC multi-character operators. */
%token OP_LE                  "<="
%token OP_GE                  ">="
%token OP_EQ                  "=="
%token OP_NE                  "<>"
%token OP_AND                 //"and"
%token OP_OR                  //"or"
%token OP_XOR                 //"xor"
%token OP_MODULUS             //"mod"
%token OP_MULT_ASSIGN         "*="
%token OP_DIV_ASSIGN          "/="
%token OP_IDIV_ASSIGN         "\\="
%token OP_ADD_ASSIGN          "+="
%token OP_SUB_ASSIGN          "-="
%token OP_CONCAT_ASSIGN       "&="
%token OP_EXP_ASSIGN          "^="

/* Numbers */
%token LITERAL_INTEGER           "int literal"
%token LITERAL_SINGLE            "float literal"
%token LITERAL_DOUBLE            "double literal"
%token LITERAL_DECIMAL           "decimal literal"
%token LITERAL_CHARACTER         "character literal"
%token LITERAL_STRING            "string literal"

%token IDENTIFIER

/* Add precedence rules to solve dangling else s/r conflict */
%nonassoc LOWPREC
%nonassoc IF
%nonassoc ELSE
%right ASSIGN
%left OP_OR
%left OP_AND
%left BITWISE_OR
%left BITWISE_AND
%left OP_SHIFT_LEFT OP_SHIFT_RIGHT
%left PLUS MINUS
%left STAR DIV PERCENT
%right BITWISE_NOT CARRET UMINUS
%nonassoc OP_INC OP_DEC
%left OPEN_PARENS
%left OPEN_BRACKET OPEN_BRACE
%left DOT
%nonassoc HIGHPREC

%start compilation_unit
%%

compilation_unit
	: opt_imports_directives 
	  opt_attributes
	  opt_declarations 
	  EOF
	  {
		$$ = $3;
	  }
	;
	
opt_declarations
	: /* empty */
	| declarations
	;

declarations
	: declaration
	| declarations declaration
	;
	
declaration
	: namespace_declaration
	| type_declaration
	  {
		string name = "";
		int mod_flags;

		if ($1 is Class){
			Class c = (Class) $1;
			mod_flags = c.ModFlags;
			name = c.Name;
		} else if ($1 is Struct){
			Struct s = (Struct) $1;
			mod_flags = s.ModFlags;
			name = s.Name;
		} else
			break;

		if ((mod_flags & (Modifiers.PRIVATE|Modifiers.PROTECTED)) != 0){
			Report.Error (
				1527, lexer.Location, 
				"Namespace elements cannot be explicitly " +
			        "declared private or protected in '" + name + "'");
		}
	  }
	;

qualified_identifier
	: IDENTIFIER
	| qualified_identifier DOT IDENTIFIER 
	  { 
	    $$ = (($1).ToString ()) + "." + ($3.ToString ()); 
	  }
	;
opt_imports_directives
	: /* empty */
	| imports_directives
	;

imports_directives
	: imports_directive 
	| imports_directives imports_directive 
	;

imports_directive
	: /* imports_alias_directive
	| */ imports_namespace_directive
	;

imports_namespace_directive
	: IMPORTS qualified_identifier EOL 
	  {
		current_namespace.Using ((string) $2, lexer.Location);
	  }
	;

opt_attributes
	: /* empty */
	;

namespace_declaration
	: NAMESPACE qualified_identifier EOL
	  {
		current_namespace = RootContext.Tree.RecordNamespace(current_namespace, name, (string)$2);
	  } 
	  opt_imports_directives
	  opt_declarations
	  END NAMESPACE EOL
	  { 
		current_namespace = current_namespace.Parent;
	  }
	;

type_declaration
	: class_declaration
	| module_declaration
//	| struct_declaration		
//	| interface_declaration		
//	| enum_declaration		
//	| delegate_declaration
	;

class_declaration
	: /* opt_attributes opt_modifiers */
	  CLASS IDENTIFIER /* opt_class_interfaces */ EOL
	  { 
	  }
	  opt_class_member_declarations
	  END CLASS EOL
	  {
	  }
	;

opt_module_modifiers
	: /* empty */	{ $$ = (int) 0; }
	| PUBLIC		{ $$ = Modifiers.PUBLIC; }
	| FRIEND		{ $$ = Modifiers.INTERNAL; }
	;

module_declaration
	: opt_attributes opt_module_modifiers
	  MODULE IDENTIFIER EOL
	  { 
		Module new_module;
		string name;

		name = MakeName((string) $4);
		new_module = new Module(current_container, 
								name, 
								(int) $2, 
								(Attributes) $1,
								lexer.Location);
		current_container = new_module;
		current_container.Namespace = current_namespace;
		RootContext.Tree.RecordDecl(name, new_module);
	  }
	  opt_class_member_declarations
	  END MODULE EOL
	  {
		Module new_module = (Module)current_container;

		current_container = current_container.Parent;
		CheckDef (current_container.AddClass(new_module), new_module.Name, new_module.Location);

		$$ = new_module;
	  }
	;

opt_class_member_declarations
	: /* empty */
	| class_member_declarations
	;

class_member_declarations
	: class_member_declaration
	| class_member_declarations class_member_declaration
	;

class_member_declaration
	: /* type_declaration
	| */ sub_declaration
	;

sub_declaration
	: SUB qualified_identifier OPEN_PARENS opt_formal_parameters CLOSE_PARENS EOL
	  opt_statements
	  END SUB EOL
	;

opt_statements
	: /* empty */
	| qualified_identifier OPEN_PARENS opt_actual_parameters CLOSE_PARENS EOL
	;

opt_formal_parameters 
	: /* empty */
	| qualified_identifier AS qualified_identifier
	;

opt_actual_parameters 
	: /* empty */
	| qualified_identifier
	| LITERAL_STRING
	;

%%


Tokenizer lexer;

public Tokenizer Lexer {
	get {
		return lexer;
	}
}		   

public override int parse ()
{
	current_namespace = new Namespace (null, "");
	current_container = RootContext.Tree.Types;
	current_container.Namespace = current_namespace;

	UseExtendedSyntax = name.EndsWith(".mbs");

	lexer = new Tokenizer (input, name, defines);
	StringBuilder value = new StringBuilder ();

	try 
	{
		if (yacc_verbose_flag)
			yyparse (lexer, new yydebug.yyDebugSimple ());
		else
			yyparse (lexer);
	} 
	catch (Exception e)
	{
		Console.WriteLine (lexer.location + "  : Parsing error ");
		Console.WriteLine (e);
	}
	
	return Report.Errors;
}

/* end end end */
}