// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php
using Nova.Parsing;
using Nova.Rendering;
using Nova.Resolving;
namespace Nova.CodeDOM
{
/// <summary>
/// Maintains a critical section on the provided object while the body of the statement is executing.
/// </summary>
public class Lock : BlockStatement
{
#region /* FIELDS */
protected Expression _target;
#endregion
#region /* CONSTRUCTORS */
/// <summary>
/// Create a <see cref="Lock"/>.
/// </summary>
public Lock(Expression target, CodeObject body)
: base(body, false)
{
Target = target;
}
/// <summary>
/// Create a <see cref="Lock"/>.
/// </summary>
public Lock(Expression target)
: base(null, false)
{
Target = target;
}
#endregion
#region /* PROPERTIES */
/// <summary>
/// The target <see cref="Expression"/> of the <see cref="Lock"/>.
/// </summary>
public Expression Target
{
get { return _target; }
set { SetField(ref _target, value, true); }
}
/// <summary>
/// The keyword associated with the <see cref="Statement"/>.
/// </summary>
public override string Keyword
{
get { return ParseToken; }
}
#endregion
#region /* METHODS */
/// <summary>
/// Deep-clone the code object.
/// </summary>
public override CodeObject Clone()
{
Lock clone = (Lock)base.Clone();
clone.CloneField(ref clone._target, _target);
return clone;
}
#endregion
#region /* PARSING */
/// <summary>
/// The token used to parse the code object.
/// </summary>
public const string ParseToken = "lock";
internal static void AddParsePoints()
{
Parser.AddParsePoint(ParseToken, Parse, typeof(IBlock));
}
/// <summary>
/// Parse a <see cref="Lock"/>.
/// </summary>
public static Lock Parse(Parser parser, CodeObject parent, ParseFlags flags)
{
return new Lock(parser, parent);
}
protected Lock(Parser parser, CodeObject parent)
: base(parser, parent)
{
ParseKeywordArgumentBody(parser, ref _target, false, false);
}
#endregion
#region /* RESOLVING */
/// <summary>
/// Resolve all child symbolic references, using the specified <see cref="ResolveCategory"/> and <see cref="ResolveFlags"/>.
/// </summary>
public override CodeObject Resolve(ResolveCategory resolveCategory, ResolveFlags flags)
{
_target = (Expression)_target.Resolve(ResolveCategory.Expression, flags);
return base.Resolve(ResolveCategory.CodeObject, flags);
}
/// <summary>
/// Returns true if the code object is an <see cref="UnresolvedRef"/> or has any <see cref="UnresolvedRef"/> children.
/// </summary>
public override bool HasUnresolvedRef()
{
if (_target != null && _target.HasUnresolvedRef())
return true;
return base.HasUnresolvedRef();
}
#endregion
#region /* FORMATTING */
/// <summary>
/// True if the <see cref="Statement"/> has an argument.
/// </summary>
public override bool HasArgument
{
get { return true; }
}
/// <summary>
/// True if the <see cref="BlockStatement"/> always requires braces.
/// </summary>
public override bool HasBracesAlways
{
get { return false; }
}
/// <summary>
/// Determines if the code object only requires a single line for display.
/// </summary>
public override bool IsSingleLine
{
get { return (base.IsSingleLine && (_target == null || (!_target.IsFirstOnLine && _target.IsSingleLine))); }
set
{
base.IsSingleLine = value;
if (value && _target != null)
{
_target.IsFirstOnLine = false;
_target.IsSingleLine = true;
}
}
}
#endregion
#region /* RENDERING */
protected override void AsTextArgument(CodeWriter writer, RenderFlags flags)
{
_target.AsText(writer, flags);
}
#endregion
}
}