/// <summary>
/// Looks for a catch-statement, and if it is found, parses and returns it.
/// </summary>
/// <param name="parentProxy">Represents the parent item.</param>
/// <param name="tryStatement">The parent try statement.</param>
/// <param name="unsafeCode">Indicates whether the code being parsed resides in an unsafe code block.</param>
/// <returns>Returns the statement.</returns>
private CatchStatement GetAttachedCatchStatement(CodeUnitProxy parentProxy, TryStatement tryStatement, bool unsafeCode)
{
Param.AssertNotNull(parentProxy, "parentProxy");
Param.AssertNotNull(tryStatement, "tryStatement");
Param.Ignore(unsafeCode);
CatchStatement catchStatement = null;
// Look for a catch keyword.
Symbol symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.Catch)
{
this.AdvanceToNextCodeSymbol(parentProxy);
var statementProxy = new CodeUnitProxy(this.document);
// Move up to the catch keyword and add it.
this.GetToken(statementProxy, TokenType.Catch, SymbolType.Catch);
Expression catchExpression = null;
// Get the opening parenthesis, if there is one.
symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.OpenParenthesis)
{
BracketToken openParenthesis = (BracketToken)this.GetToken(statementProxy, TokenType.OpenParenthesis, SymbolType.OpenParenthesis);
// Get the type, if there is one.
symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.Other)
{
catchExpression = this.GetNextExpression(statementProxy, ExpressionPrecedence.None, unsafeCode, true, true);
}
// Get the closing parenthesis.
BracketToken closeParenthesis = (BracketToken)this.GetToken(statementProxy, TokenType.CloseParenthesis, SymbolType.CloseParenthesis);
openParenthesis.MatchingBracket = closeParenthesis;
closeParenthesis.MatchingBracket = openParenthesis;
}
// Get the embedded statement. This must be a block statement.
BlockStatement childStatement = this.GetNextStatement(statementProxy, unsafeCode) as BlockStatement;
if (childStatement == null)
{
throw this.CreateSyntaxException();
}
// Create the catch statement.
catchStatement = new CatchStatement(statementProxy, tryStatement, catchExpression, childStatement);
parentProxy.Children.Add(catchStatement);
}
return catchStatement;
}
private void CheckStatementCurlyBracketPlacement(Element element, Statement statement)
{
Param.AssertNotNull(element, "element");
Param.AssertNotNull(statement, "statement");
switch (statement.StatementType)
{
case StatementType.Else:
// Check that there is nothing between the starting else keyword and the opening bracket.
this.CheckChainedStatementCurlyBracketPlacement(element, statement);
this.CheckBlockStatementsCurlyBracketPlacement(element, statement);
// Check that there is nothing between the closing bracket and the else keyword of the attached else statement.
ElseStatement elseStatement = (ElseStatement)statement;
if (elseStatement.AttachedElseStatement != null)
{
this.CheckTrailingStatementCurlyBracketPlacement(element, statement);
}
break;
case StatementType.Catch:
case StatementType.Finally:
// Check that there is nothing between the starting catch or finally keyword and the opening bracket.
this.CheckChainedStatementCurlyBracketPlacement(element, statement);
this.CheckBlockStatementsCurlyBracketPlacement(element, statement);
break;
case StatementType.If:
this.CheckBlockStatementsCurlyBracketPlacement(element, statement);
// Check that there is nothing between the closing bracket and the else keyword of the attached else statement.
IfStatement ifStatement = (IfStatement)statement;
if (ifStatement.AttachedElseStatement != null)
{
this.CheckTrailingStatementCurlyBracketPlacement(element, statement);
}
break;
case StatementType.Try:
// Check that there is nothing between the starting try keyword and the opening bracket.
this.CheckBlockStatementsCurlyBracketPlacement(element, statement);
TryStatement tryStatement = (TryStatement)statement;
if (tryStatement.FinallyStatement != null || (tryStatement.CatchStatements != null && tryStatement.CatchStatements.Count > 0))
{
// There is something attached to the end of this try statement. Check that there is nothing between
// the closing bracket of the try statement and the start of the attached statement.
this.CheckTrailingStatementCurlyBracketPlacement(element, tryStatement);
}
if (tryStatement.CatchStatements != null && tryStatement.CatchStatements.Count > 0)
{
CatchStatement[] catchStatementArray = new CatchStatement[tryStatement.CatchStatements.Count];
tryStatement.CatchStatements.CopyTo(catchStatementArray, 0);
for (int i = 0; i < catchStatementArray.Length; ++i)
{
if (catchStatementArray.Length > i + 1 || tryStatement.FinallyStatement != null)
{
// There is something attached to the end of this catch statement, either another catch or a finally.
// Check that there is nothing between the closing bracket of this catch statement and the start of the attached
// statement.
this.CheckTrailingStatementCurlyBracketPlacement(element, catchStatementArray[i]);
}
}
}
break;
case StatementType.Checked:
case StatementType.Fixed:
case StatementType.For:
case StatementType.Foreach:
case StatementType.Lock:
case StatementType.Switch:
case StatementType.Unchecked:
case StatementType.Unsafe:
case StatementType.Using:
case StatementType.While:
// Check that there is nothing between the starting keyword and the opening bracket.
this.CheckBlockStatementsCurlyBracketPlacement(element, statement);
break;
case StatementType.DoWhile:
this.CheckBlockStatementsCurlyBracketPlacement(element, statement);
this.CheckTrailingStatementCurlyBracketPlacement(element, statement);
break;
default:
break;
}
}