C# CSharp.Block类代码示例

		public static FlowBranching CreateBranching (FlowBranching parent, BranchingType type, Block block, Location loc)
		{
			switch (type) {
			case BranchingType.Exception:
			case BranchingType.Labeled:
			case BranchingType.Toplevel:
			case BranchingType.TryCatch:
				throw new InvalidOperationException ();

			case BranchingType.Switch:
				return new FlowBranchingBreakable (parent, type, SiblingType.SwitchSection, block, loc);

			case BranchingType.Block:
				return new FlowBranchingBlock (parent, type, SiblingType.Block, block, loc);

			case BranchingType.Loop:
				return new FlowBranchingBreakable (parent, type, SiblingType.Conditional, block, loc);

			case BranchingType.Embedded:
				return new FlowBranchingContinuable (parent, type, SiblingType.Conditional, block, loc);

			default:
				return new FlowBranchingBlock (parent, type, SiblingType.Conditional, block, loc);
			}
		}

        // <summary>
        //   Creates a new flow branching which is contained in `parent'.
        //   You should only pass non-null for the `block' argument if this block
        //   introduces any new variables - in this case, we need to create a new
        //   usage vector with a different size than our parent's one.
        // </summary>
        protected FlowBranching(FlowBranching parent, BranchingType type, SiblingType stype,
            Block block, Location loc)
        {
            Parent = parent;
            Block = block;
            Location = loc;
            Type = type;
            id = ++next_id;

            UsageVector vector;
            if (Block != null) {
                UsageVector parent_vector = parent != null ? parent.CurrentUsageVector : null;
                vector = new UsageVector (stype, parent_vector, Block, loc, Block.AssignableSlots);
            } else {
                vector = new UsageVector (stype, Parent.CurrentUsageVector, null, loc);
            }

            AddSibling (vector);
        }

		///
		/// Remaps block to cloned copy if one exists.
		///
		public Block RemapBlockCopy (Block from)
		{
			Block mapped_to;
			if (!block_map.TryGetValue (from, out mapped_to))
				return from;

			return mapped_to;
		}

		public void AddBlockMap (Block from, Block to)
		{
			block_map.Add (from, to);
		}

			void AddBlockChildren (BlockStatement result, Block blockStatement, List<LocalInfo> localVariables, ref int curLocal)
			{
				foreach (Statement stmt in blockStatement.Statements) {
					if (stmt == null)
						continue;
					if (curLocal < localVariables.Count && IsLower (localVariables[curLocal].Location, stmt.loc)) {
						result.AddChild (CreateVariableDeclaration (localVariables[curLocal]), AbstractCSharpNode.Roles.Statement);
						curLocal++;
					}
					if (stmt is Block && !(stmt is ToplevelBlock || stmt is ExplicitBlock)) {
						AddBlockChildren (result, (Block)stmt, localVariables, ref curLocal);
					} else {
						result.AddChild ((INode)stmt.Accept (this), AbstractCSharpNode.Roles.Statement);
					}
				}
			}

			public override object Visit (Block blockStatement)
			{
				if (blockStatement.IsGenerated) {
					if (blockStatement.Statements.First () is Using)
						return CreateUsingStatement (blockStatement);
					return blockStatement.Statements.Last ().Accept (this);
				}
				var result = new BlockStatement ();
				result.AddChild (new CSharpTokenNode (Convert (blockStatement.StartLocation), 1), AbstractCSharpNode.Roles.LBrace);
				int curLocal = 0;
				List<LocalInfo> localVariables = new List<LocalInfo> (blockStatement.Variables.Values);
				AddBlockChildren (result, blockStatement, localVariables, ref curLocal);
				
				while (curLocal < localVariables.Count) {
					result.AddChild (CreateVariableDeclaration (localVariables[curLocal]), AbstractCSharpNode.Roles.Statement);
					curLocal++;
				}
				
				result.AddChild (new CSharpTokenNode (Convert (blockStatement.EndLocation), 1), AbstractCSharpNode.Roles.RBrace);
				return result;
			}

			void AddBlockChildren(BlockStatement result, Block blockStatement, ref int curLocal)
			{
				if (convertTypeSystemMode) {
					return;
				}
				foreach (Mono.CSharp.Statement stmt in blockStatement.Statements) {
					if (stmt == null)
						continue;
					/*					if (curLocal < localVariables.Count && IsLower (localVariables[curLocal].Location, stmt.loc)) {
						result.AddChild (CreateVariableDeclaration (localVariables[curLocal]), Roles.Statement);
						curLocal++;
					}*/
					if (stmt is Block && !(stmt is ToplevelBlock || stmt is ExplicitBlock)) {
						AddBlockChildren(result, (Block)stmt, ref curLocal);
					} else {
						result.AddChild((Statement)stmt.Accept(this), BlockStatement.StatementRole);
					}
				}
			}

        void EmitMoveNext_NoResumePoints(EmitContext ec, Block original_block)
        {
            ec.Emit (OpCodes.Ldarg_0);
            ec.Emit (OpCodes.Ldfld, IteratorHost.PC.Spec);

            ec.Emit (OpCodes.Ldarg_0);
            ec.EmitInt ((int) State.After);
            ec.Emit (OpCodes.Stfld, IteratorHost.PC.Spec);

            // We only care if the PC is zero (start executing) or non-zero (don't do anything)
            ec.Emit (OpCodes.Brtrue, move_next_error);

            SymbolWriter.StartIteratorBody (ec);
            original_block.Emit (ec);
            SymbolWriter.EndIteratorBody (ec);

            ec.MarkLabel (move_next_error);
            ec.Emit (OpCodes.Ldc_I4_0);
            ec.Emit (OpCodes.Ret);
        }

void case_978()
#line 6605 "cs-parser.jay"
{
		current_block.SetEndLocation (lexer.Location);
		current_block = current_block.Parent;

		current_block = new Linq.QueryBlock (current_block, lexer.Location);
		linq_clause_blocks.Push ((Linq.QueryBlock) current_block);
	  }

void case_977()
#line 6597 "cs-parser.jay"
{
		if (linq_clause_blocks == null)
			linq_clause_blocks = new Stack<Linq.QueryBlock> ();
	  		
		current_block = new Linq.QueryBlock (current_block, lexer.Location);
		linq_clause_blocks.Push ((Linq.QueryBlock) current_block);
	  }

void case_976()
#line 6587 "cs-parser.jay"
{
		yyVal = new Linq.Where ((Linq.QueryBlock)current_block, (Expression)yyVals[0+yyTop], GetLocation (yyVals[-2+yyTop]));

		current_block.SetEndLocation (lexer.Location);
		current_block = current_block.Parent;
	  }

void case_974()
#line 6568 "cs-parser.jay"
{
		var lt = (LocatedToken) yyVals[-3+yyTop];
		var sn = new Linq.RangeVariable (lt.Value, lt.Location);
	  	yyVal = new Linq.Let ((Linq.QueryBlock) current_block, sn, (Expression)yyVals[0+yyTop], GetLocation (yyVals[-4+yyTop]));
		lbag.AddLocation (yyVal, GetLocation (yyVals[-2+yyTop]));
	  	
		current_block.SetEndLocation (lexer.Location);
		current_block = current_block.Parent;
		
		((Linq.QueryBlock)current_block).AddRangeVariable (sn);
	  }

void case_963()
#line 6522 "cs-parser.jay"
{
		var obj = (object[]) yyVals[0+yyTop];

		yyVal = new Linq.GroupBy ((Linq.QueryBlock)current_block, (Expression)yyVals[-2+yyTop], linq_clause_blocks.Pop (), (Expression)obj[0], GetLocation (yyVals[-4+yyTop]));
		lbag.AddLocation (yyVal, (Location) obj[1]);
		
		current_block.SetEndLocation (lexer.Location);
		current_block = current_block.Parent;
	  }

void case_962()
#line 6515 "cs-parser.jay"
{
		current_block.SetEndLocation (lexer.Location);
		current_block = current_block.Parent;
	  
		current_block = new Linq.QueryBlock (current_block, lexer.Location);
	  }

void case_953()
#line 6436 "cs-parser.jay"
{
		var lt = (LocatedToken) yyVals[-3+yyTop];
		var sn = new Linq.RangeVariable (lt.Value, lt.Location);

		yyVal = new Linq.SelectMany ((Linq.QueryBlock)current_block, sn, (Expression)yyVals[0+yyTop], GetLocation (yyVals[-5+yyTop])) {
			IdentifierType = (FullNamedExpression)yyVals[-4+yyTop]
		};
		
		current_block.SetEndLocation (lexer.Location);
		current_block = current_block.Parent;
		
		((Linq.QueryBlock)current_block).AddRangeVariable (sn);
		
		lbag.AddLocation (yyVal, GetLocation (yyVals[-2+yyTop]));
	  }