Remove low/high byte operators until I've thought about it more.

doc/SixtyPical.md

@@ -400,7 +400,7 @@ Grammar
     Constrnt::= ["inputs" LocExprs] ["outputs" LocExprs] ["trashes" LocExprs].
     Routine ::= "routine" Ident<new> Constraints (Block | "@" LitWord).
     LocExprs::= LocExpr {"," LocExpr}.
-    LocExpr ::= Register | Flag | Literal | ("<" | ">") Ident.
+    LocExpr ::= Register | Flag | Literal | Ident.
     Register::= "a" | "x" | "y".
     Flag    ::= "c" | "z" | "n" | "v".
     Literal ::= LitByte | LitWord.

src/sixtypical/model.py

@@ -95,6 +95,7 @@ class PartRef(Ref):
 
     height=0 = low byte, height=1 = high byte.
 
+    NOTE: Not actually used yet.  Might require more thought before it's usable.
     """
     def __init__(self, ref, height):
         assert isinstance(ref, Ref)

src/sixtypical/parser.py

@@ -4,7 +4,7 @@ from sixtypical.ast import Program, Defn, Routine, Block, Instr
 from sixtypical.model import (
     TYPE_BIT, TYPE_BYTE, TYPE_BYTE_TABLE, TYPE_WORD, TYPE_WORD_TABLE,
     RoutineType, VectorType, ExecutableType,
-    LocationRef, ConstantRef, PartRef
+    LocationRef, ConstantRef
 )
 from sixtypical.scanner import Scanner
 
@@ -142,16 +142,7 @@ class Parser(object):
             self.scanner.scan()
             return loc
         else:
-            op = None
-            if self.scanner.consume('<'):
-                op = '<'
-            elif self.scanner.consume('>'):
-                op = '>'
             loc = self.lookup(self.scanner.token)
-            if op == '<':
-                loc = PartRef(loc, 0)
-            elif op == '>':
-                loc = PartRef(loc, 1)
             self.scanner.scan()
             return loc
 

tests/SixtyPical Execution.md

@@ -435,27 +435,6 @@ Copy word to word.
     = y: 0
     = z: 0
 
-Load and store low byte, high byte of word.
-
-    | word foo : 511
-    | 
-    | routine main {
-    |     ld x, <foo
-    |     ld y, >foo
-    |     ld a, 2
-    |     st a, <foo
-    |     ld a, 1
-    |     st a, >foo
-    | }
-    = a: 1
-    = c: 0
-    = foo: 258
-    = n: 0
-    = v: 0
-    = x: 255
-    = y: 1
-    = z: 0
-
 Indirect call.
 
     | vector foo outputs x trashes z, n

tests/SixtyPical Syntax.md

@@ -164,16 +164,6 @@ User-defined locations of other types.
     | }
     = ok
 
-Referencing low and high byte of a word.
-
-    | word r1
-    | 
-    | routine main {
-    |    ld x, <r1
-    |    ld y, >r1
-    | }
-    = ok
-
 Can't access an undeclared memory location.
 
     | routine main {