/// <summary>
/// Factory method for class <see cref="ExpressionStatementASTWalker"/>.
/// </summary>
/// <param name="node"><see cref="CSharpSyntaxNode"/> Used to initialize the walker.</param>
/// <param name="semanticModel">The semantic model.</param>
/// <returns></returns>
public static ExpressionStatementASTWalker Create(CSharpSyntaxNode node, SemanticModel semanticModel = null)
{
// TODO: Use TranslationUnitFactory in order to have AST walkers decoupled from helpers
// via factories (which will be using helpers)
ExpressionStatementTranslationUnit statement;
// Return statement
if (node as ReturnStatementSyntax != null)
{
var helper = new ReturnStatement(node as ReturnStatementSyntax, semanticModel);
statement = CreateReturnStatement(helper, semanticModel);
}
// Throw statement
else if (node as ThrowStatementSyntax != null)
{
var helper = new ThrowStatement(node as ThrowStatementSyntax, semanticModel);
statement = CreateThrowStatement(helper, semanticModel);
}
// Other
else if (node as ExpressionStatementSyntax != null)
{
var helper = new ExpressionStatement(node as ExpressionStatementSyntax, semanticModel);
var expression = new ExpressionTranslationUnitBuilder(helper.Expression, semanticModel).Build();
statement = ExpressionStatementTranslationUnit.Create(expression as ExpressionTranslationUnit);
}
else
{
throw new InvalidOperationException("Unrecognized statement!");
}
return(new ExpressionStatementASTWalker(node, statement, semanticModel));
}
/// <summary>
/// Initializes a new instance of the <see cref="ExpressionStatementASTWalker"/> class.
/// </summary>
/// <param name="node"></param>
/// <param name="statement"></param>
/// <param name="semanticModel">The semantic model.</param>
protected ExpressionStatementASTWalker(CSharpSyntaxNode node, ExpressionStatementTranslationUnit expressionStatement, SemanticModel semanticModel)
: base(node, semanticModel)
{
var returnSyntaxNode = node as ReturnStatementSyntax;
var throwSyntaxNode = node as ThrowStatementSyntax;
var expressionSyntaxNode = node as ExpressionStatementSyntax;
if (returnSyntaxNode == null && throwSyntaxNode == null && expressionSyntaxNode == null)
{
throw new ArgumentException(
string.Format("Specified node ({0}) is not one of these types: {1}, {2}, {3}!",
node.GetType().Name,
typeof(ReturnStatementSyntax).Name,
typeof(ThrowStatementSyntax).Name),
typeof(ExpressionStatementSyntax).Name);
}
if (expressionStatement == null)
{
throw new ArgumentNullException(nameof(expressionStatement));
}
// Node assigned in base, no need to assign it here
this.statement = expressionStatement;
}
private static ExpressionStatementTranslationUnit CreateThrowStatement(ThrowStatement helper, SemanticModel semanticModel)
{
if (helper.Expression == null)
{
// Void return
return(ExpressionStatementTranslationUnit.CreateThrow());
}
var expression = new ExpressionTranslationUnitBuilder(helper.Expression, semanticModel).Build();
return(ExpressionStatementTranslationUnit.CreateThrow(expression as ExpressionTranslationUnit));
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public static ITranslationUnit BuildThrowStatementTranslationUnit()
{
return(ExpressionStatementTranslationUnit.CreateThrow());
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public static ITranslationUnit BuildThrowStatementTranslationUnit(ITranslationUnit expression)
{
return(ExpressionStatementTranslationUnit.CreateThrow(expression as ExpressionTranslationUnit));
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public static ITranslationUnit BuildReturnStatementTranslationUnit()
{
return(ExpressionStatementTranslationUnit.CreateReturn());
}