/// <summary>
/// Reads the next using-statement from the file and returns it.
/// </summary>
/// <param name="parentReference">
/// The parent code unit.
/// </param>
/// <param name="unsafeCode">
/// Indicates whether the code being parsed resides in an unsafe code block.
/// </param>
/// <returns>
/// Returns the statement.
/// </returns>
private UsingStatement ParseUsingStatement(Reference<ICodePart> parentReference, bool unsafeCode)
{
Param.AssertNotNull(parentReference, "parentReference");
Param.Ignore(unsafeCode);
Reference<ICodePart> statementReference = new Reference<ICodePart>();
// Move past the using keyword.
CsToken firstToken = this.GetToken(CsTokenType.Using, SymbolType.Using, parentReference, statementReference);
Node<CsToken> firstTokenNode = this.tokens.InsertLast(firstToken);
// Get the opening parenthesis.
Bracket openParenthesis = this.GetBracketToken(CsTokenType.OpenParenthesis, SymbolType.OpenParenthesis, statementReference);
Node<CsToken> openParenthesisNode = this.tokens.InsertLast(openParenthesis);
// Get the expression within the parenthesis.
Expression expression = this.GetNextExpression(ExpressionPrecedence.None, statementReference, unsafeCode, true, false);
if (expression == null)
{
throw this.CreateSyntaxException();
}
// Get the closing parenthesis.
Bracket closeParenthesis = this.GetBracketToken(CsTokenType.CloseParenthesis, SymbolType.CloseParenthesis, statementReference);
Node<CsToken> closeParenthesisNode = this.tokens.InsertLast(closeParenthesis);
openParenthesis.MatchingBracketNode = closeParenthesisNode;
closeParenthesis.MatchingBracketNode = openParenthesisNode;
// Get the embedded statement.
Statement childStatement = this.GetNextStatement(statementReference, unsafeCode);
if (childStatement == null)
{
throw this.CreateSyntaxException();
}
// Create the token list for the statement.
CsTokenList partialTokens = new CsTokenList(this.tokens, firstTokenNode, this.tokens.Last);
// Create the using-statement.
UsingStatement statement = new UsingStatement(partialTokens, expression);
statement.EmbeddedStatement = childStatement;
statementReference.Target = statement;
// Add the variable if there is one.
VariableDeclarationExpression variableDeclaration = expression as VariableDeclarationExpression;
if (variableDeclaration != null)
{
foreach (VariableDeclaratorExpression declarator in variableDeclaration.Declarators)
{
Variable variable = new Variable(
variableDeclaration.Type,
declarator.Identifier.Token.Text,
VariableModifiers.None,
CodeLocation.Join(variableDeclaration.Type.Location, declarator.Identifier.Token.Location),
statementReference,
variableDeclaration.Type.Generated || declarator.Identifier.Token.Generated);
// If there is already a variable in this scope with the same name, ignore this one.
if (!statement.Variables.Contains(declarator.Identifier.Token.Text))
{
statement.Variables.Add(variable);
}
}
}
return statement;
}
/// <summary>
/// The save.
/// </summary>
/// <param name="usingStatement">
/// The using statement.
/// </param>
private void Save(UsingStatement usingStatement)
{
var isLiteral = usingStatement.Resource is LiteralExpression;
// this.cppWriter.Write("/* using */");
if (!isLiteral)
{
this.cppWriter.WriteLine();
this.cppWriter.WriteLine("{");
this.cppWriter.Indent++;
@switch(usingStatement.Resource);
this.cppWriter.Write(";");
}
this.Save(usingStatement.EmbeddedStatement);
if (!isLiteral)
{
// get disposable interface
var variableDeclaration = usingStatement.Resource as VariableDeclarationExpression;
if (variableDeclaration != null)
{
foreach (var varDecl in variableDeclaration.Declarators)
{
this.cppWriter.Write("dynamic_cast<");
this.Save(
new TypeResolver("IDisposable", this), this.cppWriter, SavingOptions.UseFullyQualifiedNames);
this.cppWriter.Write(">(");
this.cppWriter.Write(varDecl.Identifier);
this.cppWriter.WriteLine(")->Dispose();");
}
}
this.cppWriter.Indent--;
this.cppWriter.WriteLine("}");
}
}
