/// <summary>
/// Gets the name of the element.
/// </summary>
/// <returns>The name of the element.</returns>
protected override string GetElementName()
{
// For a field, the name of the first variable declarator is the name of the field.
VariableDeclaratorExpression declarator = this.FindFirstDescendent <VariableDeclaratorExpression>();
if (declarator != null)
{
return(declarator.Identifier.Text);
}
throw new SyntaxException(this.Document, this.LineNumber);
}
/// <summary>
/// Reads an expression beginning with two unknown words.
/// </summary>
/// <param name="expressionProxy">Proxy object for the expression being created.</param>
/// <param name="parentProxy">Represents the parent item.</param>
/// <param name="type">The type of the variable.</param>
/// <param name="previousPrecedence">The precedence of the previous expression.</param>
/// <param name="unsafeCode">Indicates whether the code being parsed resides in an unsafe code block.</param>
/// <returns>Returns the expression.</returns>
private VariableDeclarationExpression GetVariableDeclarationExpression(
CodeUnitProxy expressionProxy, CodeUnitProxy parentProxy, Expression type, ExpressionPrecedence previousPrecedence, bool unsafeCode)
{
Param.AssertNotNull(expressionProxy, "expressionProxy");
Param.AssertNotNull(parentProxy, "parentProxy");
Param.AssertNotNull(type, "type");
Param.Ignore(previousPrecedence);
Param.Ignore(unsafeCode);
CsLanguageService.Debug.Assert(
type.ExpressionType == ExpressionType.Literal ||
type.ExpressionType == ExpressionType.MemberAccess ||
type.ExpressionType == ExpressionType.QualifiedAlias,
"The left side of a variable declaration must either be a literal or a member access.");
VariableDeclarationExpression expression = null;
if (CheckPrecedence(previousPrecedence, ExpressionPrecedence.None))
{
// Move past whitespace, etc, and add it to the expression proxy if we've already started the expression,
// otherwise add it to the parent.
this.AdvanceToNextCodeSymbol(expressionProxy.Children.Count > 0 ? expressionProxy : parentProxy);
// Convert the type expression to a literal type token expression.
LiteralExpression literalType = null;
if (type.ExpressionType == ExpressionType.Literal)
{
literalType = (LiteralExpression)type;
if (!literalType.Token.Is(TokenType.Type))
{
literalType = null;
}
}
if (literalType == null)
{
literalType = this.ConvertTypeExpression(type);
}
// Get each declarator.
while (true)
{
var variableDeclaratorExpressionProxy = new CodeUnitProxy(this.document);
// Get the next word.
Symbol symbol = this.PeekNextSymbol();
if (symbol.SymbolType != SymbolType.Other)
{
throw this.CreateSyntaxException();
}
// Get the identifier.
LiteralExpression identifier = this.GetLiteralExpression(variableDeclaratorExpressionProxy, unsafeCode);
if (identifier == null || identifier.Children.Count == 0)
{
throw new SyntaxException(this.document, symbol.LineNumber);
}
// Get the initializer if it exists.
Expression initializer = null;
symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.Equals)
{
// Add the equals token.
this.GetOperatorSymbolToken(variableDeclaratorExpressionProxy, OperatorType.Equals);
// Check whether this is an array initializer.
symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.OpenCurlyBracket)
{
initializer = this.GetArrayInitializerExpression(variableDeclaratorExpressionProxy, unsafeCode);
}
else
{
initializer = this.GetNextExpression(variableDeclaratorExpressionProxy, ExpressionPrecedence.None, unsafeCode);
}
}
// Create and add the declarator.
var declarator = new VariableDeclaratorExpression(variableDeclaratorExpressionProxy, identifier, initializer);
expressionProxy.Children.Add(declarator);
// Now check if the next character is a comma. If so there is another declarator.
symbol = this.PeekNextSymbol();
if (symbol.SymbolType != SymbolType.Comma)
{
// There are no more declarators.
break;
}
// Add the comma.
this.GetToken(expressionProxy, TokenType.Comma, SymbolType.Comma);
}
// Create the expression.
expression = new VariableDeclarationExpression(expressionProxy, literalType);
parentProxy.Children.Add(expression);
}
return expression;
}
/// <summary>
/// Parses and returns the declarators for a field.
/// </summary>
/// <param name="parentProxy">Represents the parent item.</param>
/// <param name="unsafeCode">Indicates whether the code is marked as unsafe.</param>
/// <param name="fieldType">The field type.</param>
/// <returns>Returns the name of the first field.</returns>
private string GetFieldDeclarators(CodeUnitProxy parentProxy, bool unsafeCode, TypeToken fieldType)
{
Param.AssertNotNull(parentProxy, "parentProxy");
Param.Ignore(unsafeCode);
Param.AssertNotNull(fieldType, "fieldType");
string firstFieldName = null;
Symbol symbol = this.PeekNextSymbol();
while (symbol.SymbolType != SymbolType.Semicolon)
{
this.AdvanceToNextCodeSymbol(parentProxy);
var declaratorProxy = new CodeUnitProxy(this.document);
// Get the identifier.
var identifierExpressionProxy = new CodeUnitProxy(this.document);
Token identifier = this.GetElementNameToken(identifierExpressionProxy, unsafeCode, true);
var identifierExpression = new LiteralExpression(identifierExpressionProxy, identifier);
declaratorProxy.Children.Add(identifierExpression);
if (firstFieldName == null)
{
firstFieldName = identifier.Text;
}
Expression initialization = null;
// Check whether there is an equals sign.
symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.Equals)
{
this.GetOperatorSymbolToken(declaratorProxy, OperatorType.Equals);
// Get the expression after the equals sign. If the expression starts with an
// opening curly bracket, then this is an initialization expression or an
// anonymous type initialization expression.
symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.OpenCurlyBracket)
{
// Determine whether this is an array or an anonymous type.
if (fieldType.Text == "var" || (
fieldType.Text != "Array" && fieldType.Text != "System.Array" && !fieldType.Text.Contains("[")))
{
initialization = this.GetAnonymousTypeInitializerExpression(declaratorProxy, unsafeCode);
}
else
{
initialization = this.GetArrayInitializerExpression(declaratorProxy, unsafeCode);
}
}
else
{
initialization = this.GetNextExpression(declaratorProxy, ExpressionPrecedence.None, unsafeCode);
}
if (initialization == null)
{
throw this.CreateSyntaxException();
}
}
var declaratorExpression = new VariableDeclaratorExpression(declaratorProxy, identifierExpression, initialization);
parentProxy.Children.Add(declaratorExpression);
// If the next symbol is a comma, continue.
symbol = this.PeekNextSymbol();
if (symbol.SymbolType == SymbolType.Comma)
{
this.GetToken(parentProxy, TokenType.Comma, SymbolType.Comma);
symbol = this.PeekNextSymbol();
}
}
// Return the declarators as a read-only collection.
return firstFieldName;
}