add case/endcase of/endof

alee.cpp

@@ -157,6 +157,7 @@ void parseLine(Parser& parser, State& state, const std::string& line)
         while (state.rsize())
             state.popr();
         state.dict.write(Dictionary::Compiling, 0);
+        state.ip = 0;
     }
 }
 

compat.txt

@@ -150,13 +150,13 @@ yes 6.2.0698 ACTION-OF
 yes 6.2.0700 AGAIN
 yes 6.2.0825 BUFFER:
 yes 6.2.0855 C"
-    6.2.0873 CASE
+yes 6.2.0873 CASE
 yes 6.2.0945 COMPILE,
 yes 6.2.1173 DEFER
 yes 6.2.1175 DEFER!
 yes 6.2.1177 DEFER@
-    6.2.1342 ENDCASE
-    6.2.1343 ENDOF
+yes 6.2.1342 ENDCASE
+yes 6.2.1343 ENDOF
 yes 6.2.1350 ERASE
 yes 6.2.1485 FALSE
 yes 6.2.1660 HEX
@@ -164,7 +164,7 @@ yes 6.2.1660 HEX
 yes 6.2.1725 IS
 yes 6.2.1850 MARKER
 yes 6.2.1930 NIP
-    6.2.1950 OF
+yes 6.2.1950 OF
     6.2.2000 PAD
     6.2.2008 PARSE
     6.2.2020 PARSE-NAME

core.fth

@@ -236,3 +236,9 @@
 : evaluate _source @ >r _sourceu @ >r >in @ >r
            0 >in ! _sourceu ! _source ! 5 sys
            r> >in ! r> _sourceu ! r> _source ! ;
+
+: case     ['] _lit , 1 here 0 , ['] drop , ; imm
+: of       ['] over , ['] = , postpone if ; imm
+: endof    ['] _jmp , here >r 0 , postpone then
+           swap 1+ swap r> tuck ! ; imm
+: endcase  swap 0 do dup @ swap here swap ! loop drop ['] drop , ; imm

dictionary.hpp

@@ -24,6 +24,17 @@
 #include <cstddef>
 #include <cstdint>
 
+/**
+ * Dictionary entry format:
+ *  - 1 information byte
+ *    bits  0..4: Length of name (L)
+ *    bit      5: Immediate?
+ *    bits 6..15: Distance to next entry (negative)
+ *  - L bytes of name
+ *  - 0+ bytes for address alignment
+ *  - 0+ bytes of entry's data...
+ */
+
 class Dictionary
 {
 public:
@@ -34,7 +45,7 @@ public:
     constexpr static Addr Source     = sizeof(Cell) * 4;
     constexpr static Addr SourceLen  = sizeof(Cell) * 5;
     constexpr static Addr Input      = sizeof(Cell) * 6; // len data...
-    constexpr static Addr InputCells = 82; // bytes!
+    constexpr static Addr InputCells = 80; // bytes!
     constexpr static Addr Begin      = sizeof(Cell) * 7 + InputCells;
 
     void initialize();