public AstGetSetNewDecl([NotNull] ISourcePosition position, [NotNull] string id, [CanBeNull] AstGetSet expression)
: base(position)
{
if (id == null)
throw new ArgumentNullException("id");
_expression = expression;
_id = id;
_arguments = _expression == null ? new ArgumentsProxy(new List<AstExpr>()) : null;
}
/// <summary>
/// Creates a new macro context in the specified macro session.
/// </summary>
/// <param name = "session">The macro expansion session.</param>
/// <param name = "invocation">The node that is being expanded.</param>
/// <param name = "isJustEffect">Whether the nodes return value will be discarded by the surrounding program.</param>
internal MacroContext(MacroSession session, AstGetSet invocation, bool isJustEffect)
{
if (session == null)
throw new ArgumentNullException("session");
if (invocation == null)
throw new ArgumentNullException("invocation");
_isJustEffect = isJustEffect;
_invocation = invocation;
_session = session;
_block = new AstScopedBlock(invocation.Position, session.CurrentBlock);
_isPartialApplication = _invocation.Arguments.Any(AstPartiallyApplicable.IsPlaceholder);
_sentinelBlock = session.Target.CurrentBlock;
}
public AstStringConcatenation(ISourcePosition position, AstGetSet simpleConcatPrototype, AstGetSet multiConcatPrototype, params AstExpr[] arguments)
: base(position)
{
if (simpleConcatPrototype == null)
throw new ArgumentNullException("simpleConcatPrototype");
if (multiConcatPrototype == null)
throw new ArgumentNullException("multiConcatPrototype");
if (arguments == null)
arguments = new AstExpr[] {};
_arguments.AddRange(arguments);
_simpleConcatPrototype = simpleConcatPrototype;
_multiConcatPrototype = multiConcatPrototype;
}
private static void _reportMacroNodeNotMacro(CompilerTarget target, string implName, AstGetSet invocation)
{
target.Loader.ReportMessage(
Message.Create(MessageSeverity.Error,
String.Format(
Resources.MacroSession_NotAMacro,
implName),
invocation.Position, MessageClasses.NotAMacro));
}
private IMacroExpander _getExpander(AstGetSet macroNode, CompilerTarget target)
{
IMacroExpander expander = null;
AstExpand expansion;
EntityRef.MacroCommand mcmd;
EntityRef.Function func;
if ((expansion = macroNode as AstExpand) != null)
{
if (expansion.Entity.TryGetMacroCommand(out mcmd))
expander = new MacroCommandExpander();
else if (expansion.Entity.TryGetFunction(out func))
expander = new MacroFunctionExpander();
else
_reportMacroNodeNotMacro(target, expansion.Entity.GetType().Name, macroNode);
}
else
{
_reportMacroNodeNotMacro(target, macroNode.GetType().Name, macroNode);
}
return expander;
}
public static AstGetSet CreateNeutralExpression(AstGetSet invocation)
{
var nullLiteral = new AstNull(invocation.File, invocation.Line, invocation.Column);
var call = new AstIndirectCall(invocation.File, invocation.Line, invocation.Column,
invocation.Call, nullLiteral);
if (invocation.Call == PCall.Set)
call.Arguments.Add(new AstNull(invocation.File, invocation.Line, invocation.Column));
return call;
}
public AstNode ExpandMacro(AstGetSet invocation, bool justEffect)
{
var target = Target;
var context = new MacroContext(this, invocation, justEffect);
//Delegate actual expansion to approriate expander
var expander = _getExpander(invocation, target);
if (expander != null)
{
expander.Initialize(target, invocation, justEffect);
//Macro invocations need to be unique within a session
if (_invocations.Contains(invocation))
{
target.Loader.ReportMessage(
Message.Create(MessageSeverity.Error,
String.Format(
Resources.MacroSession_MacroNotReentrant,
expander.HumanId),
invocation.Position, MessageClasses.MacroNotReentrant));
return CreateNeutralExpression(invocation);
}
_invocations.Add(invocation);
//check if this macro is a partial application (illegal)
if (invocation.Arguments.Any(AstPartiallyApplicable.IsPlaceholder))
{
//Attempt to expand partial macro
try
{
if (!expander.TryExpandPartially(target, context))
{
target.Loader.ReportMessage(
Message.Create(
MessageSeverity.Error,
string.Format(
Resources.MacroSession_MacroCannotBeAppliedPartially,
expander.HumanId), invocation.Position,
MessageClasses.PartialApplicationNotSupported));
return CreateNeutralExpression(invocation);
}
}
catch (Exception e)
{
_setupDefaultExpression(context);
_reportException(context, expander, e);
}
}
else
{
//Actual macro expansion takes place here
try
{
var cub = target.CurrentBlock;
expander.Expand(target, context);
if(!ReferenceEquals(cub,target.CurrentBlock))
throw new PrexoniteException("Macro must restore previous lexical scope.");
}
catch (Exception e)
{
_setupDefaultExpression(context);
_reportException(context, expander, e);
}
}
}
//Sanitize output
var ast = context.Block;
//ensure that there is at least null being pushed onto the stack))
if (!justEffect && ast.Expression == null && !context.SuppressDefaultExpression)
ast.Expression = CreateNeutralExpression(invocation);
var node = AstNode._GetOptimizedNode(Target, ast);
return node;
}
public override void Initialize(CompilerTarget target, AstGetSet macroNode, bool justEffect)
{
var expansion = (AstExpand)macroNode;
MacroFunction = null;
EntityRef.Function functionRef;
if (!expansion.Entity.TryGetFunction(out functionRef))
throw new InvalidOperationException(string.Format(Resources.MacroFunctionExpander_ExpectedFunctionReference, expansion.Entity));
PValue value;
PFunction func;
if (functionRef.TryGetEntity(target.Loader, out value) && (func = value.Value as PFunction) != null)
{
HumanId = functionRef.Id;
MacroFunction = func;
}
else
{
target.Loader.ReportMessage(
Message.Create(
MessageSeverity.Error,
String.Format(
Resources.MacroFunctionExpander_MacroFunctionNotAvailable,
functionRef,
target.Function.Id, target.Loader.ParentApplication.Module.Name),
macroNode.Position, MessageClasses.NoSuchMacroFunction));
HumanId = "could_not_resolve_macro_function";
}
}
public abstract void Initialize(CompilerTarget target, AstGetSet macroNode,
bool justEffect);
public override void Initialize(CompilerTarget target, AstGetSet macroNode, bool justEffect)
{
var expansion = (AstExpand) macroNode;
MacroCommand = null;
EntityRef.MacroCommand mcmdRef;
if(!expansion.Entity.TryGetMacroCommand(out mcmdRef))
throw new InvalidOperationException(string.Format(Resources.MacroCommandExpander_MacroCommandExpected, expansion.Entity));
PValue value;
MacroCommand mcmd;
if (mcmdRef.TryGetEntity(target.Loader, out value) && (mcmd = value.Value as MacroCommand) != null)
{
HumanId = mcmdRef.Id;
MacroCommand = mcmd;
}
else
{
target.Loader.ReportMessage(Message.Create(MessageSeverity.Error,
String.Format(
Resources.MacroCommandExpander_CannotFindMacro,
mcmdRef.Id),
macroNode.Position, MessageClasses.NoSuchMacroCommand));
HumanId = "cannot_find_macro_command";
}
}
/// <summary>
/// Copies the base class fields from this to the target.
/// </summary>
/// <param name = "target">The object that shall reveice the values from this object.</param>
protected virtual void CopyBaseMembers(AstGetSet target)
{
target.Arguments.AddRange(Arguments);
}
