/// <summary>
/// Create new instance of scope.
/// </summary>
/// <param name="parent">Scope in which Each scope is located.</param>
/// <param name="type">Type of scope.</param>
public Scope(Scope parent, CompilerScopeType type)
{
this._parent = parent;
this._type = type;
this._isBroken = parent != null ? parent.IsBroken : false;
this._locals = new ScopeLocalCollection();
}
/// <summary>
/// Looks at scope types up the scope hierarchy and returns
/// the first scope the type of which is equal to the type
/// specified.
/// </summary>
/// <param name="type">The type of scope.</param>
/// <param name="includeSelf">Flag indicating if this scope type should be also checked.</param>
public Scope GetClosestScope(CompilerScopeType type, Boolean includeSelf)
{
Scope scope = includeSelf ? this : Parent;
while (scope != null)
{
if (scope.Type == type)
{
return(scope);
}
scope = scope.Parent;
}
return(null);
}
private void EnsureScopeIsNot(CompilerScope scope, CompilerScopeType type, Token token)
{
if (scope != null && scope.Type == type)
{
if (token != null && token.Type == TokenType.Open)
{
throw new SyntaxException(String.Format("Opening keyword '{0}' is not expected within a scope '{1}' at {2}.", token.Keyword, scope.Type, token.Position));
}
if (token != null && token.Type == TokenType.Close)
{
throw new SyntaxException(String.Format("Closing keyword '{0}' is not expected within a scope '{1}' at {2}.", token.Keyword, scope.Type, token.Position));
}
String tokenPosition = token != null?token.Position.ToString() : "unknown";
throw new SyntaxException(String.Format("Scope '{0}' is not expected at pos {1}.", scope.Type, tokenPosition));
}
}
private void EnsureScopeIs(CompilerScope scope, CompilerScopeType type, Token token)
{
if (scope == null || scope.Type != type)
{
String scopeTypeName = scope != null?scope.Type.ToString() : "null";
if (token != null && token.Type == TokenType.Open)
{
throw new SyntaxException(String.Format("Opening keyword '{0}' is not expected within a scope '{1}' at {2}. Expected scope is '{3}'.", token.Keyword, scopeTypeName, token.Position, type));
}
if (token != null && token.Type == TokenType.Close)
{
throw new SyntaxException(String.Format("Closing keyword '{0}' is not expected within a scope '{1}' at {2}. Expected scope is '{3}'.", token.Keyword, scopeTypeName, token.Position, type));
}
String tokenPosition = token != null?token.Position.ToString() : "unknown";
throw new SyntaxException(String.Format("Scope '{0}' is expected but '{1}' has found at pos {2}.", type, scopeTypeName, tokenPosition));
}
}
public CompilerScope(CompilerScope parent, CompilerScopeType type)
{
this.Parent = parent;
this.Type = type;
}
