Forget to commit.
[mono.git] / mcs / gmcs / cs-parser.jay
index 9f57f295f354a5fa8b35403119b721217ca0427d..68df7ca00741aa2f52426ed8bea440c58ac8df02 100644 (file)
@@ -4,6 +4,7 @@
 //
 // Authors: Miguel de Icaza (miguel@gnu.org)
 //          Ravi Pratap     (ravi@ximian.com)
+//          Marek Safar                (marek.safar@gmail.com)
 //
 // Licensed under the terms of the GNU GPL
 //
@@ -41,7 +42,7 @@ namespace Mono.CSharp
                ///   Current block is used to add statements as we find
                ///   them.  
                /// </summary>
-               Block      current_block, top_current_block;
+               Block      current_block;
 
                Delegate   current_delegate;
 
@@ -205,10 +206,25 @@ namespace Mono.CSharp
 %token ARGLIST
 %token PARTIAL
 %token ARROW
+%token QUERY_FIRST_TOKEN
+%token FROM
+%token JOIN
+%token ON
+%token EQUALS
+%token SELECT
+%token GROUP
+%token BY
+%token LET
+%token ORDERBY
+%token ASCENDING
+%token DESCENDING
+%token INTO
+%token QUERY_LAST_TOKEN
 
 /* C# keywords which are not really keywords */
 %token GET           "get"
 %token SET           "set"
+%token VAR
 
 %left LAST_KEYWORD
 
@@ -264,6 +280,7 @@ namespace Mono.CSharp
 %token OP_XOR_ASSIGN          "^="
 %token OP_OR_ASSIGN           "|="
 %token OP_PTR                 "->"
+%token OP_COALESCING          "??"
 
 /* Numbers */
 %token LITERAL_INTEGER           "int literal"
@@ -560,55 +577,63 @@ opt_attributes
 attribute_sections
        : attribute_section
           {
-               ArrayList sect = (ArrayList) $1;
-
-               if (global_attrs_enabled) {
-                       if (current_attr_target == "module") {
-                               CodeGen.Module.AddAttributes (sect);
-                               $$ = null;
-                       } else if (current_attr_target != null && current_attr_target.Length > 0) {
-                               CodeGen.Assembly.AddAttributes (sect);
-                               $$ = null;
+               if (current_attr_target != String.Empty) {
+                       ArrayList sect = (ArrayList) $1;
+
+                       if (global_attrs_enabled) {
+                               if (current_attr_target == "module") {
+                                       CodeGen.Module.AddAttributes (sect);
+                                       $$ = null;
+                               } else if (current_attr_target != null && current_attr_target.Length > 0) {
+                                       CodeGen.Assembly.AddAttributes (sect);
+                                       $$ = null;
+                               } else {
+                                       $$ = new Attributes (sect);
+                               }
+                               if ($$ == null) {
+                                       if (RootContext.Documentation != null) {
+                                               Lexer.check_incorrect_doc_comment ();
+                                               Lexer.doc_state =
+                                                       XmlCommentState.Allowed;
+                                       }
+                               }
                        } else {
                                $$ = new Attributes (sect);
-                       }
-                       if ($$ == null) {
-                               if (RootContext.Documentation != null) {
-                                       Lexer.check_incorrect_doc_comment ();
-                                       Lexer.doc_state =
-                                               XmlCommentState.Allowed;
-                               }
-                       }
-               } else {
-                       $$ = new Attributes (sect);
-               }               
+                       }               
+               }
+               else
+                       $$ = null;
                current_attr_target = null;
-      }
+         }
        | attribute_sections attribute_section
          {
-               Attributes attrs = $1 as Attributes;
-               ArrayList sect = (ArrayList) $2;
-
-               if (global_attrs_enabled) {
-                       if (current_attr_target == "module") {
-                               CodeGen.Module.AddAttributes (sect);
-                               $$ = null;
-                       } else if (current_attr_target == "assembly") {
-                               CodeGen.Assembly.AddAttributes (sect);
-                               $$ = null;
+               if (current_attr_target != String.Empty) {
+                       Attributes attrs = $1 as Attributes;
+                       ArrayList sect = (ArrayList) $2;
+
+                       if (global_attrs_enabled) {
+                               if (current_attr_target == "module") {
+                                       CodeGen.Module.AddAttributes (sect);
+                                       $$ = null;
+                               } else if (current_attr_target == "assembly") {
+                                       CodeGen.Assembly.AddAttributes (sect);
+                                       $$ = null;
+                               } else {
+                                       if (attrs == null)
+                                               attrs = new Attributes (sect);
+                                       else
+                                               attrs.AddAttributes (sect);                     
+                               }
                        } else {
                                if (attrs == null)
                                        attrs = new Attributes (sect);
                                else
-                                       attrs.AddAttributes (sect);                     
-                       }
-               } else {
-                       if (attrs == null)
-                               attrs = new Attributes (sect);
-                       else
-                               attrs.AddAttributes (sect);
-               }               
-               $$ = attrs;
+                                       attrs.AddAttributes (sect);
+                       }               
+                       $$ = attrs;
+               }
+               else
+                       $$ = null;
                current_attr_target = null;
          }
        ;
@@ -636,11 +661,15 @@ attribute_target
        : IDENTIFIER
          {
                LocatedToken lt = (LocatedToken) $1;
-               CheckAttributeTarget (lt.Value, lt.Location);
-               $$ = lt.Value; // Location won't be required anymore.
+               $$ = CheckAttributeTarget (lt.Value, lt.Location);
          }
         | EVENT  { $$ = "event"; }       
         | RETURN { $$ = "return"; }
+      | error
+         {
+               string name = yyNames [yyToken].ToLower ();
+               $$ = CheckAttributeTarget (name, GetLocation ($1));
+         }
        ;
 
 attribute_list
@@ -676,7 +705,9 @@ attribute
 
                Expression left_expr = left == null ? null : left.GetTypeExpression ();
 
-               if (current_attr_target == "assembly" || current_attr_target == "module")
+               if (current_attr_target == String.Empty)
+                       $$ = null;
+               else if (current_attr_target == "assembly" || current_attr_target == "module")
                        // FIXME: supply "nameEscaped" parameter here.
                        $$ = new GlobalAttribute (current_namespace, current_attr_target,
                                                  left_expr, identifier, arguments, mname.Location, lexer.IsEscapedIdentifier (mname.Location));
@@ -814,7 +845,7 @@ struct_declaration
                MemberName name = MakeName ((MemberName) $6);
                push_current_class (new Struct (
                        current_namespace, current_class, name, (int) $2,
-                       (Attributes) $1), false, $3);
+                       (Attributes) $1), $3);
          }
          opt_class_base
          opt_type_parameter_constraints_clauses
@@ -1097,6 +1128,7 @@ method_declaration
                anonymous_host = (IAnonymousHost) $1;
                if (RootContext.Documentation != null)
                        Lexer.doc_state = XmlCommentState.NotAllowed;
+               Lexer.VarParsing = true;
          }
          method_body
          {
@@ -1110,6 +1142,7 @@ method_declaration
 
                if (RootContext.Documentation != null)
                        Lexer.doc_state = XmlCommentState.Allowed;
+               Lexer.VarParsing = false;
          }
        ;
 
@@ -1325,8 +1358,12 @@ fixed_parameters
        | fixed_parameters COMMA fixed_parameter
          {
                ArrayList pars = (ArrayList) $1;
-
-               pars.Add ($3);
+               Parameter p = (Parameter)$3;
+               if (p != null) {
+                       if ((p.modFlags & Parameter.Modifier.This) != 0)
+                               Report.Error (1100, p.Location, "The parameter modifier `this' can only be used on the first parameter");
+                       pars.Add (p);
+               }
                $$ = $1;
          }
        ;
@@ -1388,14 +1425,31 @@ parameter_modifiers
          }
        | parameter_modifiers parameter_modifier
          {
-               Report.Error (1108, lexer.Location, "A parameter cannot have specified more than one modifier");
-               $$ = $1;
+               Parameter.Modifier p2 = (Parameter.Modifier)$2;
+               Parameter.Modifier mod = (Parameter.Modifier)$1 | p2;
+               if (((Parameter.Modifier)$1 & p2) == p2) {
+                       Error_DuplicateParameterModifier (lexer.Location, p2);
+               } else {
+                       switch (mod & ~Parameter.Modifier.This) {
+                               case Parameter.Modifier.REF:
+                                       Report.Error (1101, lexer.Location, "The parameter modifiers `this' and `ref' cannot be used altogether");
+                                       break;
+                               case Parameter.Modifier.OUT:
+                                       Report.Error (1102, lexer.Location, "The parameter modifiers `this' and `out' cannot be used altogether");
+                                       break;
+                               default:
+                                       Report.Error (1108, lexer.Location, "A parameter cannot have specified more than one modifier");
+                                       break;
+                       }
+               }
+               $$ = mod;
          }
        ;
 
 parameter_modifier
        : REF                   { $$ = Parameter.Modifier.REF; }
        | OUT                   { $$ = Parameter.Modifier.OUT; }
+       | THIS                  { $$ = Parameter.Modifier.This; }
        ;
 
 parameter_array
@@ -1404,10 +1458,20 @@ parameter_array
                LocatedToken lt = (LocatedToken) $4;
                $$ = new ParamsParameter ((Expression) $3, lt.Value, (Attributes) $1, lt.Location);
          }
+       | opt_attributes PARAMS PARAMS type IDENTIFIER 
+         {
+               Error_DuplicateParameterModifier (lexer.Location, Parameter.Modifier.PARAMS);
+               $$ = null;
+         }
        | opt_attributes PARAMS parameter_modifier type IDENTIFIER 
          {
-               Report.Error (1611, (Location) $2, "The params parameter cannot be declared as ref or out");
-                $$ = null;
+               Parameter.Modifier mod = (Parameter.Modifier)$3;
+               if ((mod & Parameter.Modifier.This) != 0) {
+                       Report.Error (1104, lexer.Location, "The parameter modifiers `this' and `params' cannot be used altogether");
+               } else {
+                       Report.Error (1611, (Location) $2, "The params parameter cannot be declared as ref or out");
+               }
+        $$ = null;
          }
        | opt_attributes PARAMS type error {
                CheckIdentifierToken (yyToken, GetLocation ($4));
@@ -1451,8 +1515,8 @@ property_declaration
                        syntax_error (lexer.Location, "a property can't have type arguments");
 
                prop = new Property (current_class, (Expression) $3, (int) $2, false,
-                                    name, (Attributes) $1, get_block, set_block, accessors.declared_in_reverse);
-               
+                                    name, (Attributes) $1, get_block, set_block, accessors.declared_in_reverse, current_block);
+
                current_container.AddProperty (prop);
                implicit_value_parameter_type = null;
 
@@ -1598,7 +1662,7 @@ interface_declaration
 
                push_current_class (new Interface (
                        current_namespace, current_class, name, (int) $2,
-                       (Attributes) $1), true, $3);
+                       (Attributes) $1), $3);
          }
          opt_class_base
          opt_type_parameter_constraints_clauses
@@ -1760,7 +1824,7 @@ opt_new
        ;
 
 interface_method_declaration_body
-       : open_brace
+       : OPEN_BRACE 
          {
                lexer.ConstraintsParsing = false;
          }
@@ -2028,13 +2092,13 @@ operator_body
        ; 
 operator_declarator
        : type OPERATOR overloadable_operator 
-         open_parens opt_parameter_modifier type IDENTIFIER CLOSE_PARENS
+         open_parens opt_attributes opt_parameter_modifier type IDENTIFIER CLOSE_PARENS
          {
                // TODO: wrong location
-               if ((Parameter.Modifier)$5 != Parameter.Modifier.NONE)
+               if ((Parameter.Modifier)$6 != Parameter.Modifier.NONE)
                        Error_ParameterModifierNotValid ((Location) $2);
          
-               LocatedToken lt = (LocatedToken) $7;
+               LocatedToken lt = (LocatedToken) $8;
                Operator.OpType op = (Operator.OpType) $3;
                CheckUnaryOperator (op, lt.Location);
 
@@ -2045,9 +2109,9 @@ operator_declarator
                        op = Operator.OpType.UnaryNegation;
 
                Parameter [] pars = new Parameter [1];
-               Expression type = (Expression) $6;
+               Expression type = (Expression) $7;
 
-               pars [0] = new Parameter (type, lt.Value, Parameter.Modifier.NONE, null, lt.Location);
+               pars [0] = new Parameter (type, lt.Value, Parameter.Modifier.NONE, (Attributes) $5, lt.Location);
 
                current_local_parameters = new Parameters (pars);
 
@@ -2061,25 +2125,25 @@ operator_declarator
          }
        | type OPERATOR overloadable_operator
          open_parens 
-               opt_parameter_modifier type IDENTIFIER COMMA
-               opt_parameter_modifier type IDENTIFIER 
+               opt_attributes opt_parameter_modifier type IDENTIFIER COMMA
+               opt_attributes opt_parameter_modifier type IDENTIFIER 
          CLOSE_PARENS
           {
                // TODO: wrong location
-               if ((Parameter.Modifier)$5 != Parameter.Modifier.NONE || (Parameter.Modifier)$9 != Parameter.Modifier.NONE)
+               if ((Parameter.Modifier)$6 != Parameter.Modifier.NONE || (Parameter.Modifier)$11 != Parameter.Modifier.NONE)
                        Error_ParameterModifierNotValid ((Location) $2);
 
-               LocatedToken ltParam1 = (LocatedToken) $7;
-               LocatedToken ltParam2 = (LocatedToken) $11;
+               LocatedToken ltParam1 = (LocatedToken) $8;
+               LocatedToken ltParam2 = (LocatedToken) $13;
                CheckBinaryOperator ((Operator.OpType) $3, (Location) $2);
 
                Parameter [] pars = new Parameter [2];
 
-               Expression typeL = (Expression) $6;
-               Expression typeR = (Expression) $10;
+               Expression typeL = (Expression) $7;
+               Expression typeR = (Expression) $12;
 
-              pars [0] = new Parameter (typeL, ltParam1.Value, Parameter.Modifier.NONE, null, ltParam1.Location);
-              pars [1] = new Parameter (typeR, ltParam2.Value, Parameter.Modifier.NONE, null, ltParam2.Location);
+              pars [0] = new Parameter (typeL, ltParam1.Value, Parameter.Modifier.NONE, (Attributes) $5, ltParam1.Location);
+              pars [1] = new Parameter (typeR, ltParam2.Value, Parameter.Modifier.NONE, (Attributes) $10, ltParam2.Location);
 
               current_local_parameters = new Parameters (pars);
 
@@ -2095,10 +2159,8 @@ operator_declarator
        | conversion_operator_declarator
        | type OPERATOR overloadable_operator
          open_parens 
-               opt_parameter_modifier type IDENTIFIER COMMA
-               opt_parameter_modifier type IDENTIFIER COMMA
-               opt_parameter_modifier type IDENTIFIER
-         CLOSE_PARENS
+               opt_attributes opt_parameter_modifier type IDENTIFIER COMMA
+               opt_attributes opt_parameter_modifier type IDENTIFIER COMMA error
          {
                Report.Error (1534, (Location) $2, "Overloaded binary operator `{0}' takes two parameters",
                        Operator.GetName ((Operator.OpType) $3));
@@ -2240,6 +2302,18 @@ constructor_declaration
        ;
 
 constructor_declarator
+       : constructor_header
+         {
+               $$ = $1;
+         }
+       | constructor_header constructor_initializer
+         {
+               ((Constructor)$1).Initializer = (ConstructorInitializer) $2;
+               $$ = $1;
+         }
+       ;
+
+constructor_header
        : IDENTIFIER
          {
                if (RootContext.Documentation != null) {
@@ -2248,27 +2322,21 @@ constructor_declarator
                }
          }
          open_parens opt_formal_parameter_list CLOSE_PARENS
-         {
-               current_local_parameters = (Parameters) $4;
-         }
-         opt_constructor_initializer
          {
                LocatedToken lt = (LocatedToken) $1;
-               $$ = new Constructor (current_class, lt.Value, 0, (Parameters) $4,
-                                     (ConstructorInitializer) $7, lt.Location);
+               current_local_parameters = (Parameters) $4;
+               current_block = new ToplevelBlock (null, current_local_parameters, null, lt.Location);
+
+               $$ = new Constructor (current_class, lt.Value, 0, current_local_parameters,
+                                     null, lt.Location);
 
                anonymous_host = (IAnonymousHost) $$;
          }
        ;
 
 constructor_body
-       : block
-       | SEMICOLON             { $$ = null; }
-       ;
-
-opt_constructor_initializer
-       : /* empty */                   { $$ = null; }
-       | constructor_initializer
+       : block_prepared
+       | SEMICOLON             { current_block = null; $$ = null; }
        ;
 
 constructor_initializer
@@ -2442,11 +2510,19 @@ add_accessor_declaration
                
                current_local_parameters = new Parameters (args);  
                lexer.EventParsing = false;
+               
+               anonymous_host = SimpleAnonymousHost.GetSimple ();
          }
           block
          {
-               $$ = new Accessor ((ToplevelBlock) $4, 0, (Attributes) $1, (Location) $2);
+               Accessor accessor = new Accessor ((ToplevelBlock) $4, 0, (Attributes) $1, (Location) $2);
                lexer.EventParsing = true;
+               
+               current_local_parameters = null;
+               SimpleAnonymousHost.Simple.Propagate (accessor);
+               anonymous_host = null;
+               
+               $$ = accessor;
          }
        | opt_attributes ADD error {
                Report.Error (73, (Location) $2, "An add or remove accessor must have a body");
@@ -2603,8 +2679,9 @@ enum_declaration
 
                EnumMember em = null;
                foreach (VariableDeclaration ev in (ArrayList) $7) {
-                       em = new EnumMember (e, em, (Expression) ev.expression_or_array_initializer,
-                               new MemberName (ev.identifier, ev.Location), ev.OptAttributes);
+                       em = new EnumMember (
+                               e, em, ev.identifier, (Expression) ev.expression_or_array_initializer,
+                               ev.OptAttributes, ev.Location);
 
 //                     if (RootContext.Documentation != null)
                                em.DocComment = ev.DocComment;
@@ -2612,7 +2689,7 @@ enum_declaration
                        e.AddEnumMember (em);
                }
 
-               current_container.AddEnum (e);
+               current_container.AddTypeContainer (e);
                $$ = e;
 
          }
@@ -2836,6 +2913,10 @@ type
          }
        | array_type
        | pointer_type
+       | VAR
+         {
+               $$ = new VarExpr (lexer.Location);
+         }
        ;
 
 pointer_type
@@ -3100,6 +3181,111 @@ invocation_expression
          }
        ;
 
+opt_object_initializer
+       : /* empty */           { $$ = null; }
+       | OPEN_BRACE variable_declarators CLOSE_BRACE
+         {
+               ArrayList vars = (ArrayList) $2;
+               ArrayList inits = new ArrayList (vars.Count);
+               foreach (VariableDeclaration variable in vars) {
+                       Initializer i = new Initializer (variable.identifier, variable.expression_or_array_initializer);
+                       inits.Add (i);
+               }
+               $$ = inits;
+         }
+       ;
+
+opt_object_or_collection_initializer
+       : /* empty */           { $$ = null; }
+       | object_or_collection_initializer
+       ;
+
+object_or_collection_initializer
+       : object_initializer
+       | collection_initializer
+       ;
+
+object_initializer
+       : OPEN_BRACE opt_member_initializer_list CLOSE_BRACE
+         {
+               if ($2 == null)
+                       $$ = null;
+               else
+                       $$ = new ObjectInitializer ((ArrayList)$2);
+         }
+       | OPEN_BRACE member_initializer_list COMMA CLOSE_BRACE
+         {
+               $$ = new ObjectInitializer ((ArrayList) $2);
+         }
+       ;
+
+opt_member_initializer_list
+       : /* empty */           { $$ = null; }
+       | member_initializer_list
+       ;
+
+member_initializer_list
+       : member_initializer
+         {
+               ArrayList a = new ArrayList ();
+               a.Add ($1);
+               $$ = a;
+         }
+       | member_initializer_list COMMA member_initializer
+         {
+               ArrayList a = (ArrayList)$1;
+               a.Add ($3);
+               $$ = a;
+         }
+       ;
+
+member_initializer
+       : IDENTIFIER ASSIGN initializer_value
+         {
+               LocatedToken id = $1 as LocatedToken;
+               IInitializable i = $3 as IInitializable;
+               if (i != null)
+                       $$ = new Initializer (id.Value, i);
+               else
+                       $$ = new Initializer (id.Value, (Expression)$3);
+         }
+       ;
+
+initializer_value
+       : expression
+       | object_or_collection_initializer
+       ;
+
+collection_initializer
+       : OPEN_BRACE element_initializer_list CLOSE_BRACE
+         {
+               $$ = new CollectionInitializer ((ArrayList) $2);
+         }
+       | OPEN_BRACE element_initializer_list COMMA CLOSE_BRACE
+         {
+               $$ = new CollectionInitializer ((ArrayList) $2);
+         }
+       ;
+
+element_initializer_list
+       : element_initializer
+         {
+               ArrayList a = new ArrayList ();
+               a.Add ($1);
+               $$ = a;
+         }
+       | element_initializer_list COMMA element_initializer
+         {
+               ArrayList a = $1 as ArrayList;
+               a.Add ($3);
+               $$ = a;
+         }
+       ;
+
+element_initializer
+       : non_assignment_expression
+       ;
+
 opt_argument_list
        : /* empty */           { $$ = null; }
        | argument_list
@@ -3153,6 +3339,10 @@ non_simple_argument
                Expression expr = new Arglist (args, (Location) $1);
                $$ = new Argument (expr, Argument.AType.Expression);
          }
+       | ARGLIST OPEN_PARENS CLOSE_PARENS
+         {
+               $$ = new Argument (new Arglist ((Location) $1), Argument.AType.Expression);
+         }       
        | ARGLIST
          {
                $$ = new Argument (new ArglistAccess ((Location) $1), Argument.AType.ArgList);
@@ -3251,12 +3441,31 @@ post_decrement_expression
 new_expression
        : object_or_delegate_creation_expression
        | array_creation_expression
+       | anonymous_type_expression
        ;
 
 object_or_delegate_creation_expression
-       : NEW type OPEN_PARENS opt_argument_list CLOSE_PARENS
+       : NEW type OPEN_PARENS opt_argument_list CLOSE_PARENS opt_object_or_collection_initializer
+         {
+               if ($6 != null) {
+                       if (RootContext.Version < LanguageVersion.LINQ) {
+                               Error_ExpectingTypeName ((Expression) $2);
+                               $$ = null;
+                       }
+                       else
+                               $$ = new NewInitialize ((Expression) $2, (ArrayList) $4, (IInitializable) $6, (Location) $1);
+               }
+               else
+                       $$ = new New ((Expression) $2, (ArrayList) $4, (Location) $1);
+         }
+       | NEW type object_or_collection_initializer
          {
-               $$ = new New ((Expression) $2, (ArrayList) $4, (Location) $1);
+               if (RootContext.Version < LanguageVersion.LINQ) {
+                       Report.Error (1526, (Location) $1, "A new expression requires () or [] after type");
+                       $$ = null;
+               }
+               else
+                       $$ = new NewInitialize ((Expression) $2, new ArrayList (), (IInitializable) $3, (Location) $1);
          }
        ;
 
@@ -3271,6 +3480,15 @@ array_creation_expression
          {
                $$ = new ArrayCreation ((Expression) $2, (string) $3, (ArrayList) $4, (Location) $1);
          }
+       | NEW rank_specifiers array_initializer
+         {
+               if (RootContext.Version < LanguageVersion.LINQ) {
+                       Report.Error (1031, (Location) $1, "Type expected");
+                       $$ = null;
+               }
+               else
+                       $$ = new ArrayCreation (new VarExpr((Location) $1), (string) $2, (ArrayList) $3, (Location) $1);
+         }
        | NEW error
          {
                Report.Error (1031, (Location) $1, "Type expected");
@@ -3283,6 +3501,50 @@ array_creation_expression
          }
        ;
 
+anonymous_type_expression
+       : NEW OPEN_BRACE anonymous_type_parameters CLOSE_BRACE
+         {
+               if (RootContext.Version < LanguageVersion.LINQ) {
+                       Report.Error (1031, (Location) $1, "Type expected");
+                       $$ = null;
+               }
+               else
+                       $$ = new AnonymousType ((ArrayList) $3, current_container, lexer.Location);
+         }
+       ;
+
+anonymous_type_parameters
+       : anonymous_type_parameter
+         {
+               ArrayList a = new ArrayList (4);
+               a.Add ($1);
+               $$ = a;
+         }
+       | anonymous_type_parameters COMMA anonymous_type_parameter
+         {
+               ArrayList a = (ArrayList) $1;
+               a.Add ($3);
+               $$ = a;
+         }
+       ;
+
+anonymous_type_parameter
+       : variable_declarator
+         {
+               VariableDeclaration v = (VariableDeclaration) $1;
+               Expression e = v.expression_or_array_initializer;
+               if (e == null) {
+                       e = new LocalVariableReference (current_block, v.identifier, lexer.Location);
+               }
+               $$ = new AnonymousTypeParameter (e, v.identifier);
+         }
+       | member_access
+         {
+               MemberAccess ma = (MemberAccess) $1;
+               $$ = new AnonymousTypeParameter (ma, ma.Identifier);
+         }
+       ;
+
 opt_rank_specifier
        : /* empty */
          {
@@ -3449,7 +3711,7 @@ anonymous_method_expression
          }
          block
          {
-               $$ = end_anonymous ((ToplevelBlock) $4, null, (Location) $1);
+               $$ = end_anonymous ((ToplevelBlock) $4, (Location) $1);
        }
        ;
 
@@ -3473,7 +3735,7 @@ anonymous_method_signature
        ;
 
 opt_anonymous_method_parameter_list
-       : /* empty */   { $$ = null; } 
+       : /* empty */                      { $$ = null; } 
        | anonymous_method_parameter_list  { $$ = $1; }
        ;
 
@@ -3769,9 +4031,9 @@ conditional_expression
          {
                $$ = new Conditional ((Expression) $1, (Expression) $3, (Expression) $5);
          }
-       | conditional_or_expression INTERR INTERR expression
+       | conditional_or_expression OP_COALESCING expression
          {
-               $$ = new Nullable.NullCoalescingOperator ((Expression) $1, (Expression) $4, lexer.Location);
+               $$ = new Nullable.NullCoalescingOperator ((Expression) $1, (Expression) $3, lexer.Location);
          }
        // We'll be resolved into a `parenthesized_expression_0' later on.
        | conditional_or_expression INTERR CLOSE_PARENS
@@ -3909,13 +4171,11 @@ lambda_expression_body
          expression 
          {
                Block b = end_block (lexer.Location);
-               oob_stack.Push ($2);
                b.AddStatement (new ContextualReturn ((Expression) $2));
                $$ = b;
          } 
        | block { 
                $$ = $1; 
-               oob_stack.Push (null);
          } 
        ;
 
@@ -3932,7 +4192,7 @@ lambda_expression
          }
          lambda_expression_body
          {
-               $$ = end_anonymous ((ToplevelBlock) $4, (Expression) oob_stack.Pop (), (Location) $2);
+               $$ = end_anonymous ((ToplevelBlock) $4, (Location) $2);
          }
        | OPEN_PARENS_LAMBDA opt_lambda_parameter_list CLOSE_PARENS ARROW 
          {
@@ -3940,14 +4200,19 @@ lambda_expression
          }
          lambda_expression_body 
          {
-               $$ = end_anonymous ((ToplevelBlock) $6, (Expression) oob_stack.Pop (), (Location) $4);
+               $$ = end_anonymous ((ToplevelBlock) $6, (Location) $4);
          }
        ;
 
 expression
+       : assignment_expression
+       | non_assignment_expression
+       ;
+       
+non_assignment_expression
        : conditional_expression
-       | assignment_expression
        | lambda_expression
+       | query_expression
        ;
 
 constant_expression
@@ -3976,7 +4241,7 @@ class_declaration
 
                push_current_class (new Class (
                        current_namespace, current_class, name,
-                       mod_flags, (Attributes) $1), false, $3);
+                       mod_flags, (Attributes) $1), $3);
          }
          opt_class_base
          opt_type_parameter_constraints_clauses
@@ -4149,6 +4414,14 @@ block
          }
        ;
 
+block_prepared
+       : OPEN_BRACE 
+         opt_statement_list CLOSE_BRACE 
+         { 
+               $$ = end_block ((Location) $3);
+         }
+       ;
+
 opt_statement_list
        : /* empty */
        | statement_list 
@@ -4330,6 +4603,10 @@ local_variable_declaration
                else
                        $$ = null;
          }
+       | VAR variable_declarators
+         {
+               $$ = new DictionaryEntry (new VarExpr (lexer.Location), $2);
+         }
         | local_variable_pointer_type opt_rank_specifier_or_nullable variable_declarators
          {
                if ($1 != null){
@@ -4476,11 +4753,7 @@ switch_section
          }
          statement_list 
          {
-               Block topmost = current_block;
-
-               while (topmost.Implicit)
-                       topmost = topmost.Parent;
-               $$ = new SwitchSection ((ArrayList) $1, topmost);
+               $$ = new SwitchSection ((ArrayList) $1, current_block.Explicit);
          }
        ;
 
@@ -4540,8 +4813,9 @@ for_statement
        : FOR open_parens 
          opt_for_initializer SEMICOLON
          {
-               Block assign_block = new Block (current_block);
-               current_block = assign_block;
+               Location l = lexer.Location;
+               start_block (l);  
+               Block assign_block = current_block;
 
                if ($3 is DictionaryEntry){
                        DictionaryEntry de = (DictionaryEntry) $3;
@@ -4557,7 +4831,6 @@ for_statement
                                if (vi == null)
                                        continue;
 
-                               Location l = lexer.Location;
                                Expression expr = decl.expression_or_array_initializer;
                                        
                                LocalVariableReference var;
@@ -4586,10 +4859,8 @@ for_statement
                For f = new For ((Statement) $5, (Expression) $6, (Statement) $8, (Statement) $10, l);
 
                current_block.AddStatement (f);
-               while (current_block.Implicit)
-                       current_block = current_block.Parent;
-               $$ = current_block;
-               current_block = current_block.Parent;
+
+               $$ = end_block (lexer.Location);
          }
        ;
 
@@ -4622,7 +4893,7 @@ statement_expression_list
          {
                // CHANGE: was `null'
                Statement s = (Statement) $1;
-               Block b = new Block (current_block, Block.Flags.Implicit, s.loc, lexer.Location);   
+               Block b = new Block (current_block, s.loc, lexer.Location);   
 
                b.AddStatement (s);
                $$ = b;
@@ -4645,8 +4916,8 @@ foreach_statement
        | FOREACH open_parens type IDENTIFIER IN
          expression CLOSE_PARENS 
          {
-               Block foreach_block = new Block (current_block);
-               current_block = foreach_block;
+               start_block (lexer.Location);
+               Block foreach_block = current_block;
 
                LocatedToken lt = (LocatedToken) $4;
                Location l = lt.Location;
@@ -4675,10 +4946,7 @@ foreach_statement
                        current_block.AddStatement (f);
                }
 
-               while (current_block.Implicit)
-                         current_block = current_block.Parent;
-               $$ = current_block;
-               current_block = current_block.Parent;
+               $$ = end_block (lexer.Location);
          }
        ;
 
@@ -4876,9 +5144,8 @@ catch_clause
 
                                one.Add (new VariableDeclaration (lt, null));
 
-                               current_block = new Block (current_block);
-                               Block b = declare_local_variables (type, one, lt.Location);
-                               current_block = b;
+                               start_block (lexer.Location);
+                               current_block = declare_local_variables (type, one, lt.Location);
                        }
                }
          } block {
@@ -4893,10 +5160,7 @@ catch_clause
 
                        if (lt != null){
                                id = lt.Value;
-                               while (current_block.Implicit)
-                                       current_block = current_block.Parent;
-                               var_block = current_block;
-                               current_block = current_block.Parent;
+                               var_block = end_block (lexer.Location);
                        }
                }
 
@@ -4950,8 +5214,8 @@ fixed_statement
                Location l = (Location) $1;
                int top = list.Count;
 
-               Block assign_block = new Block (current_block);
-               current_block = assign_block;
+               start_block (lexer.Location);
+               Block assign_block = current_block;
 
                for (int i = 0; i < top; i++){
                        Pair p = (Pair) list [i];
@@ -4961,6 +5225,9 @@ fixed_statement
                        if (v == null)
                                continue;
 
+                       if (type is VarExpr)
+                               v.VariableType = typeof(VarExpr); // Kinda lame. Avoids a problem in the VariableMap ctor
+
                        v.SetReadOnlyContext (LocalInfo.ReadOnlyContext.Fixed);
                        v.Pinned = true;
                        p.First = v;
@@ -4974,10 +5241,8 @@ fixed_statement
                Fixed f = new Fixed ((Expression) $3, (ArrayList) $4, (Statement) $7, l);
 
                current_block.AddStatement (f);
-               while (current_block.Implicit)
-                       current_block = current_block.Parent;
-               $$ = current_block;
-               current_block = current_block.Parent;
+
+               $$ = end_block (lexer.Location);
          }
        ;
 
@@ -5025,8 +5290,8 @@ lock_statement
 using_statement
        : USING open_parens resource_acquisition CLOSE_PARENS
          {
-               Block assign_block = new Block (current_block);
-               current_block = assign_block;
+               start_block (lexer.Location);
+               Block assign_block = current_block;
 
                if ($3 is DictionaryEntry){
                        DictionaryEntry de = (DictionaryEntry) $3;
@@ -5074,10 +5339,7 @@ using_statement
          {
                Using u = new Using ($5, (Statement) $6, (Location) $1);
                current_block.AddStatement (u);
-               while (current_block.Implicit)
-                       current_block = current_block.Parent;
-               $$ = current_block;
-               current_block = current_block.Parent;
+               $$ = end_block (lexer.Location);
          }
        ; 
 
@@ -5086,6 +5348,138 @@ resource_acquisition
        | expression
        ;
 
+
+// LINQ
+
+query_expression
+       : from_clause query_body
+         {
+               lexer.QueryParsing = false;
+               $$ = new Linq.QueryExpression (current_container, current_block, (Expression)$1, (Linq.AQueryClause)$2); 
+               end_block (lexer.Location);
+         }
+       ;
+       
+from_clause
+       : FROM IDENTIFIER IN expression opt_join_clauses
+         {
+               start_block (lexer.Location);
+               LocatedToken lt = (LocatedToken) $2;
+               
+               LocalInfo vi = current_block.AddVariable (TypeManager.system_object_expr, lt.Value, lt.Location);  // TODO: null is var type
+               if (vi != null) {
+                       $$ = new LocalVariableReference (current_block, lt.Value, lt.Location, vi, false);
+               }
+               $$ = $4;
+         }
+       | FROM type IDENTIFIER IN expression opt_join_clauses
+         {
+               start_block (lexer.Location);
+               LocatedToken lt = (LocatedToken) $3;
+
+               Expression type = (Expression)$2;
+               LocalInfo vi = current_block.AddVariable (type, lt.Value, lt.Location);
+               $$ = new Linq.Cast (type, (Expression)$5, lt.Location);
+         }
+       ;
+
+opt_join_clauses
+       : /* empty */
+       | join_clauses
+       ;
+
+join_clauses
+       : join_clause
+       | join_clauses join_clause
+       ;
+       
+join_clause
+       : JOIN join_clause_body
+       | JOIN join_clause_body INTO IDENTIFIER
+       | JOIN type join_clause_body
+       | JOIN type join_clause_body INTO IDENTIFIER
+       ;
+       
+join_clause_body
+       : IDENTIFIER IN expression ON expression EQUALS expression
+       ;
+
+query_body
+       : opt_from_let_where_clauses opt_orderby_clause SELECT expression opt_query_continuation
+         {
+               Linq.AQueryClause ret = new Linq.Select ((Expression)$4, GetLocation ($3));
+               
+               if ($1 != null) {
+                       ((Linq.AQueryClause)$1).Next = ret;
+                       ret = (Linq.AQueryClause)$1;
+               }
+                       
+               $$ = ret;
+         }
+       | opt_from_let_where_clauses opt_orderby_clause group_clause opt_query_continuation
+       ;
+       
+opt_from_let_where_clauses
+       : /* empty */
+       | from_let_where_clauses
+       ;
+       
+from_let_where_clauses
+       : from_let_where_clause
+       | from_let_where_clauses from_let_where_clause
+       ;
+       
+from_let_where_clause
+       : from_clause
+       | let_clause
+       | where_clause
+       ;
+       
+let_clause
+       : LET IDENTIFIER ASSIGN expression
+       ;
+
+where_clause
+       : WHERE boolean_expression
+         {
+               $$ = new Linq.Where ((Expression)$2, GetLocation ($1));
+         }
+       ;
+       
+opt_orderby_clause
+       : /* empty */
+       | orderby_clause
+       ;
+       
+orderby_clause
+       : ORDERBY orderings
+       ;
+       
+orderings
+       : ordering
+       | orderings COMMA ordering
+       ;
+       
+ordering
+       : expression
+       | expression ASCENDING
+       | expression DESCENDING
+       ;
+
+       
+group_clause
+       : GROUP expression BY expression
+       ;
+
+opt_query_continuation
+       : /* empty */
+       | query_continuation
+       ;
+       
+query_continuation
+       : INTO IDENTIFIER opt_join_clauses query_body
+       ;
+
 %%
 
 // <summary>
@@ -5213,12 +5607,18 @@ public static void Error_ParameterModifierNotValid (Location loc)
        Report.Error (631, loc, "The modifiers `ref' and `out' are not valid in this context");
 }
 
-void push_current_class (TypeContainer tc, bool is_interface, object partial_token)
+static void Error_DuplicateParameterModifier (Location loc, Parameter.Modifier mod)
+{
+       Report.Error (1107, loc, "Duplicate parameter modifier `{0}'",
+               Parameter.GetModifierSignature (mod));
+}
+
+void push_current_class (TypeContainer tc, object partial_token)
 {
        if (partial_token != null)
-               current_container = current_container.AddPartial (tc, is_interface);
+               current_container = current_container.AddPartial (tc);
        else
-               current_container = current_container.AddTypeContainer (tc, is_interface);
+               current_container = current_container.AddTypeContainer (tc);
        current_class = tc;
 }
 
@@ -5272,7 +5672,7 @@ Block declare_local_variables (Expression type, ArrayList variable_declarators,
        // int j = 1;  int k = j + 1;
        //
        if (current_block.Used)
-               implicit_block = new Block (current_block, Block.Flags.Implicit, loc, Location.Null);
+               implicit_block = new Block (current_block, loc, Location.Null);
        else
                implicit_block = current_block;
 
@@ -5310,7 +5710,7 @@ Block declare_local_constants (Expression type, ArrayList declarators)
        Block implicit_block;
 
        if (current_block.Used)
-               implicit_block = new Block (current_block, Block.Flags.Implicit);
+               implicit_block = new Block (current_block);
        else
                implicit_block = current_block;
 
@@ -5321,18 +5721,16 @@ Block declare_local_constants (Expression type, ArrayList declarators)
        return implicit_block;
 }
 
-void CheckAttributeTarget (string a, Location l)
+string CheckAttributeTarget (string a, Location l)
 {
        switch (a) {
-
        case "assembly" : case "module" : case "field" : case "method" : case "param" : case "property" : case "type" :
-               return;
-               
-       default :
-               Report.Error (658, l, "`" + a + "' is an invalid attribute target");
-               break;
+                       return a;
        }
 
+       Report.Warning (658, 1, l,
+                "`{0}' is invalid attribute target. All attributes in this attribute section will be ignored", a);
+       return string.Empty;
 }
 
 void CheckUnaryOperator (Operator.OpType op, Location l)
@@ -5482,35 +5880,20 @@ Location GetLocation (object obj)
 void 
 start_block (Location loc)
 {
-       if (parsing_anonymous_method) {
-               top_current_block = new ToplevelBlock (
-                       current_block, current_local_parameters, current_generic_method, loc);
-               if (current_block != null)
-                       current_block.AddAnonymousChild ((ToplevelBlock) top_current_block);
-               current_block = top_current_block;
+       if (current_block == null || parsing_anonymous_method) {
+               current_block = new ToplevelBlock (current_block, current_local_parameters, current_generic_method, loc);
                parsing_anonymous_method = false;
-       } else if (current_block == null) {
-               current_block = new ToplevelBlock (
-                       (ToplevelBlock) top_current_block, current_local_parameters,
-                       current_generic_method, loc);
-               top_current_block = current_block;
        } else {
-               current_block = new Block (current_block, loc, Location.Null);
+               current_block = new ExplicitBlock (current_block, loc, Location.Null);
        }
 }
 
 Block
 end_block (Location loc)
 {
-       Block retval;
-
-       while (current_block.Implicit)
-               current_block = current_block.Parent;
-       retval = current_block;
-       current_block.SetEndLocation (loc);
-       current_block = current_block.Parent;
-       if (current_block == null)
-               top_current_block = null;
+       Block retval = current_block.Explicit;
+       retval.SetEndLocation (loc);
+       current_block = retval.Parent;
        return retval;
 }
 
@@ -5522,18 +5905,17 @@ start_anonymous (bool lambda, Parameters parameters, Location loc)
 
        current_local_parameters = parameters;
 
-       // Force the next block to be created as a ToplevelBlock
-       oob_stack.Push (current_block);
-       oob_stack.Push (top_current_block);
+       ToplevelBlock top_current_block = current_block == null ? null : current_block.Toplevel;
 
        current_anonymous_method = lambda 
                ? new LambdaExpression (
                        current_anonymous_method, current_generic_method, current_container,
-                       parameters, (ToplevelBlock) top_current_block, loc) 
+                       parameters, top_current_block, loc) 
                : new AnonymousMethodExpression (
                        current_anonymous_method, current_generic_method, current_container,
-                       parameters, (ToplevelBlock) top_current_block, loc);
+                       parameters, top_current_block, loc);
 
+       // Force the next block to be created as a ToplevelBlock
        parsing_anonymous_method = true;
 }
 
@@ -5542,22 +5924,14 @@ start_anonymous (bool lambda, Parameters parameters, Location loc)
  * means that we have a Statement instead of an Expression embedded 
  */
 AnonymousMethodExpression 
-end_anonymous (ToplevelBlock anon_block, Expression lambda_expr, Location loc)
+end_anonymous (ToplevelBlock anon_block, Location loc)
 {
        AnonymousMethodExpression retval;
 
-       top_current_block = (Block) oob_stack.Pop ();
-       current_block = (Block) oob_stack.Pop ();
-
        if (RootContext.Version == LanguageVersion.ISO_1){
                Report.FeatureIsNotISO1 (loc, "anonymous methods");
                retval = null;
        } else  {
-               anon_block.Parent = current_block;
-
-               if (lambda_expr != null)
-                       ((LambdaExpression) current_anonymous_method).SetExpression (lambda_expr);
-
                current_anonymous_method.Block = anon_block;
                if ((anonymous_host != null) && (current_anonymous_method.Parent == null))
                        anonymous_host.AddAnonymousMethod (current_anonymous_method);