[www] publish Annotated.java to complete the java lab2 stub

README.md

@@ -48,7 +48,7 @@ Material: plt = course book, dragon = Dragon book. Slides follow closely the plt
 | Tue 19/11 | 13-15 | Type checking | [slides](plt-book/ipl-book/slides/4-slides-ipl-book.pdf), plt 4, dragon 5,6, [script](notes/type-checking.html), [prime.c](notes/prime.c), [prime-stms.c](notes/prime-stms.c), [division.c](notes/division.c), [division-annotated.c](notes/division-annotated.c) |
 | Thu 21/11 | 13-15 | Interpreting | [slides](plt-book/ipl-book/slides/5-slides-ipl-book.pdf), plt 5, [script](notes/interpreter.html) |
 | Tue 26/11 | 13-14 | Hands-on with Lab 2 (Haskell) |  [script](notes/monads.html) |
-| Tue 26/11 | 14-15 | Hands-on with Lab 2 (Java)    | [script](notes/java.html) |
+| Tue 26/11 | 14-15 | Hands-on with Lab 2 (Java)    | [script](notes/java.html), [Annotated.java](notes/Annotated.java) |
 | Thu 28/11 | 13-15 **SB-H5** | Code generation | [slides](plt-book/ipl-book/slides/6-slides-ipl-book.pdf), plt 6, dragon 6,7, [notes](notes/compilation.html), [prime.c](notes/prime.c), [prime.j](notes/prime.j) |
 | Tue 03/12 | 13-14 | Hands-on with Lab 3 (Haskell) |  |
 | Tue 03/12 | 14-15 | Hands-on with Lab 3 (Java)    |  |

notes/Annotated.java

@@ -0,0 +1,92 @@
+// Programming Language Technology (Chalmers DAT151 / GU DIT231)
+// (C) 2022-24 Andreas Abel
+// All rights reserved.
+
+import java.util.List;
+
+// The annotated version of abstract syntax of language CMM.
+
+interface Annotated {
+
+    // The following is yet a representation of the CMM syntax
+    // _before_ type checking.
+    //
+    // TODO: Change this to type-annotated syntax trees.
+    //
+    // In essence this amounts to:
+    //
+    //   * Adding "Type" fields to some of the constructors.
+    //   * Adding a "type()" method to the "Exp" interface to give
+    //     uniform constant-time access to the type of the expression.
+    //   * Possibly adding an expression constructor to convert from 'int' to 'double'.
+    //
+    // However, you might want to also restructure expressions (and statements etc.)
+    // to better fit the need of the interpreter.
+    // (E.g., 'EMul' and 'EAdd' could be fused to 'EArithOp' etc.)
+
+    // Programs
+
+    record Program(List<Def> listdef_) {}
+
+    // Function definitions
+
+    record Def(Type type_, String id_, List<Arg> listarg_, List<Stm> liststm_) {}
+
+    // Function parameters
+
+    record Arg(Type type_, String id_) {}
+
+    // Statements
+
+    sealed interface Stm permits
+        SDecls, SInit, SBlock,
+        SExp, SReturn, SWhile, SIfElse                  {}
+
+    record SDecls  (Type type_, List<String> listid_)   implements Stm {}
+    record SInit   (Type type_, String id_, Exp exp_)   implements Stm {}
+    record SBlock  (List<Stm> liststm_)                 implements Stm {}
+    record SExp    (Exp exp_)                           implements Stm {}
+    record SReturn (Exp exp_)                           implements Stm {}
+    record SWhile  (Exp exp_, Stm stm_)                 implements Stm {}
+    record SIfElse (Exp exp_, Stm stm_1, Stm stm_2)     implements Stm {}
+
+    // Expressions
+
+    sealed interface Exp permits
+        EBool, EInt, EDouble, EId, EApp, EPost, EPre,
+        EMul, EAdd, ECmp, EAnd, EOr, EAss               {}
+
+    record EBool   (Boolean boolean_)                   implements Exp {}
+    record EInt    (Integer integer_)                   implements Exp {}
+    record EDouble (Double double_)                     implements Exp {}
+
+    record EId     (String id_)                         implements Exp {}
+    record EApp    (String id_, List<Exp> listexp_)     implements Exp {}
+
+    record EPost   (String id_, IncDecOp incdecop_)     implements Exp {}
+    record EPre    (IncDecOp incdecop_, String id_)     implements Exp {}
+
+    record EMul    (Exp exp_1, MulOp mulop_, Exp exp_2) implements Exp {}
+    record EAdd    (Exp exp_1, AddOp addop_, Exp exp_2) implements Exp {}
+    record ECmp    (Exp exp_1, CmpOp cmpop_, Exp exp_2) implements Exp {}
+
+    record EAnd    (Exp exp_1, Exp exp_2)               implements Exp {}
+    record EOr     (Exp exp_1, Exp exp_2)               implements Exp {}
+
+    record EAss    (String id_, Exp exp_)               implements Exp {}
+
+    // Types and operators can be concisely represented as enums.
+    // However, you could also (partially) reuse their definition in cmm.Absyn.
+
+    // Operators
+
+    enum IncDecOp { OInc, ODec };
+    enum MulOp    { OTimes, ODiv };
+    enum AddOp    { OPlus, OMinus };
+    enum CmpOp    { OLt, OGt, OLtEq, OGtEq, OEq, ONEq };
+
+    // Types
+
+    enum Type     { Type_bool, Type_int, Type_double, Type_void };
+
+}