// A map literal. private static void Map(Compiler c, bool allowAssignment) { // Load the Map class. int mapClassSymbol = c._parser.Module.Variables.FindIndex(v => v.Name == "Map"); c.EmitShortArg(Instruction.LoadModuleVar, mapClassSymbol); // Instantiate a new map. c.CallMethod(0, "<instantiate>"); // Compile the map elements. Each one is compiled to just invoke the // subscript setter on the map. if (c.Peek() != TokenType.RightBrace) { do { c.IgnoreNewlines(); // Push a copy of the map since the subscript call will consume it. c.Emit(Instruction.Dup); // The key. c.ParsePrecedence(false, Precedence.Primary); c.Consume(TokenType.Colon, "Expect ':' after map key."); // The value. c.Expression(); c.CallMethod(2, "[_]=(_)"); // Discard the result of the setter call. c.Emit(Instruction.Pop); } while (c.Match(TokenType.Comma)); } // Allow newlines before the closing '}'. c.IgnoreNewlines(); c.Consume(TokenType.RightBrace, "Expect '}' after map entries."); }
private static void Field(Compiler c, bool allowAssignment) { // Initialize it with a fake value so we can keep parsing and minimize the // number of cascaded errors. int field = 255; ClassCompiler enclosingClass = c.GetEnclosingClass(); if (enclosingClass == null) { c.Error("Cannot reference a field outside of a class definition."); } else if (enclosingClass.IsStaticMethod) { c.Error("Cannot use an instance field in a static method."); } else { // Look up the field, or implicitly define it. string fieldName = c._parser.Source.Substring(c._parser.Previous.Start, c._parser.Previous.Length); field = enclosingClass.Fields.IndexOf(fieldName); if (field < 0) { enclosingClass.Fields.Add(fieldName); field = enclosingClass.Fields.IndexOf(fieldName); } if (field >= MaxFields) { c.Error(string.Format("A class can only have {0} fields.", MaxFields)); } } // If there's an "=" after a field name, it's an assignment. bool isLoad = true; if (c.Match(TokenType.Eq)) { if (!allowAssignment) c.Error("Invalid assignment."); // Compile the right-hand side. c.Expression(); isLoad = false; } // If we're directly inside a method, use a more optimal instruction. if (c._parent != null && c._parent._enclosingClass == enclosingClass) { c.EmitByteArg(isLoad ? Instruction.LoadFieldThis : Instruction.StoreFieldThis, field); } else { c.LoadThis(); c.EmitByteArg(isLoad ? Instruction.LoadField : Instruction.StoreField, field); } }
// A list literal. private static void List(Compiler c, bool allowAssignment) { // Load the List class. int listClassSymbol = c._parser.Module.Variables.FindIndex(v => v.Name == "List"); //ASSERT(listClassSymbol != -1, "Should have already defined 'List' variable."); c.EmitShortArg(Instruction.LoadModuleVar, listClassSymbol); // Instantiate a new list. c.CallMethod(0, "<instantiate>"); // Compile the list elements. Each one compiles to a ".add()" call. if (c.Peek() != TokenType.RightBracket) { do { c.IgnoreNewlines(); // Push a copy of the list since the add() call will consume it. c.Emit(Instruction.Dup); // The element. c.Expression(); c.CallMethod(1, "add(_)"); // Discard the result of the add() call. c.Emit(Instruction.Pop); } while (c.Match(TokenType.Comma)); } // Allow newlines before the closing ']'. c.IgnoreNewlines(); c.Consume(TokenType.RightBracket, "Expect ']' after list elements."); }
public static ObjFn Compile(SophieVM vm, ObjModule module, string sourcePath, string source, bool printErrors) { Parser parser = new Parser { Vm = vm, Module = module, SourcePath = sourcePath, Source = source, TokenStart = 0, CurrentChar = 0, CurrentLine = 1, Current = { Type = TokenType.Error, Start = 0, Length = 0, Line = 0 }, PrintErrors = printErrors, HasError = false, Raw = "" }; Compiler compiler = new Compiler(parser, null, true); // Read the first token. compiler.NextToken(); compiler.IgnoreNewlines(); while (!compiler.Match(TokenType.Eof)) { compiler.Definition(); // If there is no newline, it must be the end of the block on the same line. if (!compiler.MatchLine()) { compiler.Consume(TokenType.Eof, "Expect end of file."); break; } } compiler.Emit(Instruction.Null); compiler.Emit(Instruction.Return); // See if there are any implicitly declared module-level variables that never // got an explicit definition. // TODO: It would be nice if the error was on the line where it was used. for (int i = 0; i < parser.Module.Variables.Count; i++) { ModuleVariable t = parser.Module.Variables[i]; if (t.Container == Obj.Undefined) { compiler.Error(string.Format("Variable '{0}' is used but not defined.", t.Name)); } } return compiler.EndCompiler(); }
private static void super_(Compiler c, bool allowAssignment) { ClassCompiler enclosingClass = c.GetEnclosingClass(); if (enclosingClass == null) { c.Error("Cannot use 'super' outside of a method."); } else if (enclosingClass.IsStaticMethod) { c.Error("Cannot use 'super' in a static method."); } c.LoadThis(); // TODO: Super operator calls. // See if it's a named super call, or an unnamed one. if (c.Match(TokenType.Dot)) { // Compile the superclass call. c.Consume(TokenType.Name, "Expect method name after 'super.'."); c.NamedCall(allowAssignment, Instruction.Super0); } else if (enclosingClass != null) { // No explicit name, so use the name of the enclosing method. Make sure we // check that enclosingClass isn't null first. We've already reported the // error, but we don't want to crash here. c.MethodCall(Instruction.Super0, enclosingClass.MethodName, enclosingClass.MethodLength); } }
// Subscript or "array indexing" operator like `foo[bar]`. private static void Subscript(Compiler c, bool allowAssignment) { Signature signature = new Signature { Name = "", Length = 0, Type = SignatureType.Subscript, Arity = 0 }; // Parse the argument list. c.FinishArgumentList(signature); c.Consume(TokenType.RightBracket, "Expect ']' after arguments."); if (c.Match(TokenType.Eq)) { if (!allowAssignment) c.Error("Invalid assignment."); signature.Type = SignatureType.SubscriptSetter; // Compile the assigned value. c.ValidateNumParameters(++signature.Arity); c.Expression(); } c.CallSignature(Instruction.Call0, signature); }
private static void new_(Compiler c, bool allowAssignment) { // Allow a dotted name after 'new'. c.Consume(TokenType.Name, "Expect name after 'new'."); Name(c, false); while (c.Match(TokenType.Dot)) { Call(c, false); } // The angle brackets in the name are to ensure users can't call it directly. c.CallMethod(0, "<instantiate>"); // Invoke the constructor on the new instance. c.MethodCall(Instruction.Call0, "new", 3); }
// Compiles a method signature for an operator that can either be unary or // infix (i.e. "-"). private static void MixedSignature(Compiler c, Signature signature) { signature.Type = SignatureType.Getter; // If there is a parameter, it's an infix operator, otherwise it's unary. if (c.Match(TokenType.LeftParen)) { // Add the RHS parameter. signature.Type = SignatureType.Method; signature.Arity = 1; // Parse the parameter name. c.DeclareNamedVariable(); c.Consume(TokenType.RightParen, "Expect ')' after parameter name."); } }