diff --git a/grf/alpine/alpine.py b/grf/alpine/alpine.py
index 494a790044..aa79309a31 100644
--- a/grf/alpine/alpine.py
+++ b/grf/alpine/alpine.py
@@ -114,7 +114,16 @@ replace_coastal_sprites('gfx/water/seashore_grid_temperate.gimp.png', 1, 1)
 png = grf.ImageFile("gfx/meadow_grid_temperate.png")
 gen.add_sprite(grf.SpriteSet(grf.OBJECT, 19))
 tmpl_ground_sprites(lambda *args, **kw: gen.add_sprite(grf.FileSprite(png, *args, **kw)), 1, 1)
-gen.add_sprite(grf.BasicSpriteLayout(grf.OBJECT, 255))
+# gen.add_sprite(grf.BasicSpriteLayout(grf.OBJECT, 255))
+gen.add_sprite(grf.AdvancedSpriteLayout(
+    grf.OBJECT, 255,
+    ground={
+        'sprite': 0,
+        'pal': 32768,
+        'flags': 2,
+        'add': grf.Temp(0),
+    }
+))
 
 gen.add_sprite(grf.Object(0,
     label=b'FLMA',
@@ -124,15 +133,29 @@ gen.add_sprite(grf.Object(0,
     flags=grf.Object.Flags.HAS_NO_FOUNDATION | grf.Object.Flags.ALLOW_UNDER_BRIDGE,
 ))
 
+gen.add_sprite(grf.VarAction2(
+    feature=grf.OBJECT,
+    use_related=False,
+    set_id=0,
+    ranges={0: 0, 1: 1, 2: 2, 4: 4, 8: 8, 9: 9, 3: 3, 6: 6, 12: 12, 5: 5, 10: 10, 11: 11, 7: 7, 14: 14, 13: 13, 27: 17, 23: 16, 30: 18, 29: 15},
+    default=0,
+    code='tile_slope'
+))
+
+gen.add_sprite(grf.VarAction2(
+    feature=grf.OBJECT,
+    use_related=False,
+    set_id=255,
+    ranges={0: grf.Set(255)},
+    default=grf.Set(255),
+    code='TEMP[0] = call(0)'
+))
+
 gen.add_sprite(grf.Action3(grf.OBJECT, [0], [[255, 255]], 255))
 
-{0:  0, 1: 1, 2: 2, 4: 4, 8: 8, 9: 9, 3: 3, 6: 6, 12: 12, 5: 5, 10: 10, 11: 11, 7: 7, 14: 14, 13: 13, 27: 17, 23: 16, 30: 18, 29: 15}
 
 # CREEKS
 
-
-
-
 # MEADOW
 
 # spriteset (meadow_groundsprites, "gfx/meadow_grid_temperate.png") { tmpl_groundsprites(1, 1) }
diff --git a/grf/alpine/grf.py b/grf/alpine/grf.py
index 20fdf4ffdf..ae9639f422 100644
--- a/grf/alpine/grf.py
+++ b/grf/alpine/grf.py
@@ -6,6 +6,9 @@ import spectra
 import struct
 import numpy as np
 
+from parser import Node, Expr, Value, Var, Temp, Perm, Call, parse_code, OP_INIT
+
+
 to_spectra = lambda r, g, b: spectra.rgb(float(r) / 255., float(g) / 255., float(b) / 255.)
 # working with DOS palette only
 PALETTE = (0, 0, 255, 16, 16, 16, 32, 32, 32, 48, 48, 48, 64, 64, 64, 80, 80, 80, 100, 100, 100, 116, 116, 116, 132, 132, 132, 148, 148, 148, 168, 168, 168, 184, 184, 184, 200, 200, 200, 216, 216, 216, 232, 232, 232, 252, 252, 252, 52, 60, 72, 68, 76, 92, 88, 96, 112, 108, 116, 132, 132, 140, 152, 156, 160, 172, 176, 184, 196, 204, 208, 220, 48, 44, 4, 64, 60, 12, 80, 76, 20, 96, 92, 28, 120, 120, 64, 148, 148, 100, 176, 176, 132, 204, 204, 168, 72, 44, 4, 88, 60, 20, 104, 80, 44, 124, 104, 72, 152, 132, 92, 184, 160, 120, 212, 188, 148, 244, 220, 176, 64, 0, 4, 88, 4, 16, 112, 16, 32, 136, 32, 52, 160, 56, 76, 188, 84, 108, 204, 104, 124, 220, 132, 144, 236, 156, 164, 252, 188, 192, 252, 208, 0, 252, 232, 60, 252, 252, 128, 76, 40, 0, 96, 60, 8, 116, 88, 28, 136, 116, 56, 156, 136, 80, 176, 156, 108, 196, 180, 136, 68, 24, 0, 96, 44, 4, 128, 68, 8, 156, 96, 16, 184, 120, 24, 212, 156, 32, 232, 184, 16, 252, 212, 0, 252, 248, 128, 252, 252, 192, 32, 4, 0, 64, 20, 8, 84, 28, 16, 108, 44, 28, 128, 56, 40, 148, 72, 56, 168, 92, 76, 184, 108, 88, 196, 128, 108, 212, 148, 128, 8, 52, 0, 16, 64, 0, 32, 80, 4, 48, 96, 4, 64, 112, 12, 84, 132, 20, 104, 148, 28, 128, 168, 44, 28, 52, 24, 44, 68, 32, 60, 88, 48, 80, 104, 60, 104, 124, 76, 128, 148, 92, 152, 176, 108, 180, 204, 124, 16, 52, 24, 32, 72, 44, 56, 96, 72, 76, 116, 88, 96, 136, 108, 120, 164, 136, 152, 192, 168, 184, 220, 200, 32, 24, 0, 56, 28, 0, 72, 40, 4, 88, 52, 12, 104, 64, 24, 124, 84, 44, 140, 108, 64, 160, 128, 88, 76, 40, 16, 96, 52, 24, 116, 68, 40, 136, 84, 56, 164, 96, 64, 184, 112, 80, 204, 128, 96, 212, 148, 112, 224, 168, 128, 236, 188, 148, 80, 28, 4, 100, 40, 20, 120, 56, 40, 140, 76, 64, 160, 100, 96, 184, 136, 136, 36, 40, 68, 48, 52, 84, 64, 64, 100, 80, 80, 116, 100, 100, 136, 132, 132, 164, 172, 172, 192, 212, 212, 224, 40, 20, 112, 64, 44, 144, 88, 64, 172, 104, 76, 196, 120, 88, 224, 140, 104, 252, 160, 136, 252, 188, 168, 252, 0, 24, 108, 0, 36, 132, 0, 52, 160, 0, 72, 184, 0, 96, 212, 24, 120, 220, 56, 144, 232, 88, 168, 240, 128, 196, 252, 188, 224, 252, 16, 64, 96, 24, 80, 108, 40, 96, 120, 52, 112, 132, 80, 140, 160, 116, 172, 192, 156, 204, 220, 204, 240, 252, 172, 52, 52, 212, 52, 52, 252, 52, 52, 252, 100, 88, 252, 144, 124, 252, 184, 160, 252, 216, 200, 252, 244, 236, 72, 20, 112, 92, 44, 140, 112, 68, 168, 140, 100, 196, 168, 136, 224, 200, 176, 248, 208, 184, 255, 232, 208, 252, 60, 0, 0, 92, 0, 0, 128, 0, 0, 160, 0, 0, 196, 0, 0, 224, 0, 0, 252, 0, 0, 252, 80, 0, 252, 108, 0, 252, 136, 0, 252, 164, 0, 252, 192, 0, 252, 220, 0, 252, 252, 0, 204, 136, 8, 228, 144, 4, 252, 156, 0, 252, 176, 48, 252, 196, 100, 252, 216, 152, 8, 24, 88, 12, 36, 104, 20, 52, 124, 28, 68, 140, 40, 92, 164, 56, 120, 188, 72, 152, 216, 100, 172, 224, 92, 156, 52, 108, 176, 64, 124, 200, 76, 144, 224, 92, 224, 244, 252, 200, 236, 248, 180, 220, 236, 132, 188, 216, 88, 152, 172, 244, 0, 244, 245, 0, 245, 246, 0, 246, 247, 0, 247, 248, 0, 248, 249, 0, 249, 250, 0, 250, 251, 0, 251, 252, 0, 252, 253, 0, 253, 254, 0, 254, 255, 0, 255, 76, 24, 8, 108, 44, 24, 144, 72, 52, 176, 108, 84, 210, 146, 126, 252, 60, 0, 252, 84, 0, 252, 104, 0, 252, 124, 0, 252, 148, 0, 252, 172, 0, 252, 196, 0, 64, 0, 0, 255, 0, 0, 48, 48, 0, 64, 64, 0, 80, 80, 0, 255, 255, 0, 32, 68, 112, 36, 72, 116, 40, 76, 120, 44, 80, 124, 48, 84, 128, 72, 100, 144, 100, 132, 168, 216, 244, 252, 96, 128, 164, 68, 96, 140, 255, 255, 255)
@@ -21,6 +24,12 @@ BPP_8, BPP_32 = range(2)
 OBJECT = 0x0f
 
 
+def hex_str(s):
+    if isinstance(s, (bytes, memoryview)):
+        return ':'.join('{:02x}'.format(b) for b in s)
+    return ':'.join('{:02x}'.format(ord(c)) for c in s)
+
+
 def color_distance(c1, c2):
     rmean = (c1.rgb[0] + c2.rgb[0]) / 2.
     r = c1.rgb[0] - c2.rgb[0]
@@ -46,82 +55,6 @@ def find_best_color(x, in_range=SAFE_COLORS):
 #     assert im.mode == 'RGB', im.mode
 #     data = np.array(im)
 
-OP_ADD = 0x00
-OP_SUB = 0x01
-OP_TSTO = 0x0E
-OP_PSTO = 0x10
-
-OPERATORS = {
-    OP_ADD: ('{a} + {b}', 2),
-    OP_SUB: ('{a} - {b}', 2),
-    OP_TSTO: ('TEMP[{b}] = {a}', 1),
-    OP_PSTO: ('PERM[{b}] = {a}', 1),
-}
-
-DEFAULT_INDENT_STR = '    '
-
-
-class Node:
-    def __init__(self):
-        pass
-
-    def _make_node(self, value):
-        if isinstance(value, int):
-            return Value(value)
-        assert isinstance(value, Node)
-        return value
-
-    def __add__(self, other):
-        return Expr(OP_ADD, self, self._make_node(other))
-
-    def __sub__(self, other):
-        return Expr(OP_SUB, self, self._make_node(other))
-
-    def store_temp(self, register):
-        return Expr(OP_TSTO, self, self._make_node(register))
-
-    def store_perm(self, register):
-        return Expr(OP_PSTO, self, self._make_node(register))
-
-    def format(self, parent_priority=0, indent=0, indent_str=DEFAULT_INDENT_STR):
-        raise NotImplementedError
-
-    def __str__(self):
-        return self.format()
-
-    def __repr__(self):
-        return self.format()
-
-
-class Expr(Node):
-    def __init__(self, op, a, b):
-        self.op = op
-        self.a = a
-        self.b = b
-
-    def format(self, parent_priority=0, indent=0, indent_str=DEFAULT_INDENT_STR):
-        if self.op in OPERATORS:
-            fmt, prio = OPERATORS[self.op]
-        else:
-            fmt, prio = '{a} <{self.op:02x}> {b}', 1
-        astr = self.a.format(prio, indent=0)
-        bstr = self.b.format(prio, indent=0)
-        res = fmt.format(a=astr, b=bstr)
-        suffix = indent_str * indent
-        if prio <= parent_priority:
-            return suffix + f'({res})'
-        return suffix + res
-
-
-class Value(Node):
-    def __init__(self, value):
-        super().__init__()
-        self.value = value
-
-    def format(self, parent_priority=0, indent=0, indent_str=DEFAULT_INDENT_STR):
-        return indent_str * indent + str(self.value)
-
-
 class BaseSprite:
     def get_data(self):
         raise NotImplemented
@@ -476,11 +409,11 @@ class SpriteSet(Action1):
 
 
 class BasicSpriteLayout(LazyBaseSprite):
-    def __init__(self, feature, ref_id, xofs=0, yofs=0, extent=(0, 0, 0)):
+    def __init__(self, feature, set_id, xofs=0, yofs=0, extent=(0, 0, 0)):
         super().__init__()
         assert feature in (0x07, 0x09, OBJECT, 0x11), feature
         self.feature = feature
-        self.ref_id = ref_id
+        self.set_id = set_id
         self.xofs = xofs
         self.yofs = yofs
         self.extent = extent
@@ -489,13 +422,135 @@ class BasicSpriteLayout(LazyBaseSprite):
         return id | (mode << 14) | (recolor << 16) | (draw_in_transparent << 30) | (use_last << 31)
 
     def _encode(self):
-        return struct.pack('<BBBBIIbbBBB', 0x02, self.feature, self.ref_id, 0,
+        return struct.pack('<BBBBIIbbBBB', 0x02, self.feature, self.set_id, 0,
                            # self._encode_sprite(), self._encode_sprite(),
                            self._encode_sprite(use_last=True), 0,
                            self.xofs, self.yofs,
+
                            *self.extent)
 
 
+class AdvancedSpriteLayout(LazyBaseSprite):
+    def __init__(self, feature, set_id, ground, sprites=()):
+        super().__init__()
+        assert feature in (0x07, 0x09, OBJECT, 0x11), feature
+        assert len(sprites) < 64, len(sprites)
+        self.feature = feature
+        self.set_id = set_id
+        self.ground = ground
+        self.sprites = sprites
+
+    def _encode_sprite(self, sprite, aux=False):
+        res = struct.pack('<HHH', sprite['sprite'], sprite['pal'], sprite['flags'])
+
+        if aux:
+            delta = s.get('delta', (0, 0, 0))
+            is_parent = bool(sprite.get('parent'))
+            if not is_parent:
+                delta = (delta[0], delta[1], 0x80)
+            res += struct.pack('<BBB', *delta)
+            if is_parent:
+                res += struct.pack('<BBB', *sprite.get('size'))
+
+        for k in ('dodraw', 'add', 'palette', 'sprite_var10', 'palette_var10'):
+            if k in sprite:
+                val = sprite[k]
+                if k == 'add':
+                    assert isinstance(val, Temp)
+                    val = val.register
+                res += bytes((val, ))
+        # TODO deltas
+        return res
+
+    def _encode(self):
+        res = struct.pack('<BBBB', 0x02, self.feature, self.set_id, len(self.sprites) + 0x40)
+        res += self._encode_sprite(self.ground)
+        for s in self.sprites:
+            res += self._encode_sprite(s, True)
+
+        return res
+
+
+class Set:
+    def __init__(self, set_id):
+        self.value = set_id
+        self.is_callback = bool(set_id & 0x8000)
+        self.set_id = set_id & 0x7fff
+
+    def __str__(self):
+        if self.is_callback:
+            return f'CB({self.set_id})'
+        return f'Set({self.set_id})'
+
+    __repr__ = __str__
+
+
+class CB(Set):
+    def __init__(self, value):
+        super().__init__(value | 0x8000)
+
+
+class Range:
+    def __init__(self, low, high, set):
+        self.set = set
+        self.low = low
+        self.high = high
+
+    def __str__(self):
+        if self.low == self.high:
+            return f'{self.low} -> {self.set}'
+        return f'{self.low}..{self.high} -> {self.set}'
+
+    __repr__ = __str__
+
+
+class VarAction2(LazyBaseSprite):
+    def __init__(self, feature, set_id, use_related, ranges, default, code):
+        super().__init__()
+        self.feature = feature
+        assert feature == OBJECT, feature
+        self.set_id = set_id
+        self.use_related = use_related
+        self.ranges = ranges
+        self.default = default
+        self.code = parse_code(code)
+
+    def _get_set_value(self, set_obj):
+        if isinstance(set_obj, Set):
+            return set_obj.value
+        assert isinstance(set_obj, int)
+        return set_obj | 0x8000
+
+    def _encode(self):
+        res = bytes((0x02, self.feature, self.set_id, 0x8a if self.use_related else 0x89))
+        code = self.code[0].compile(register=0x80)[1]
+        for c in self.code[1:]:
+            code += bytes((OP_INIT,))
+            code += c.compile(register=0x80)[1]
+        # print('CODE', hex_str(code))
+        res += code[:-5]
+        res += bytes((code[-5] & ~0x20,))  # mark the end of a chain
+        res += code[-4:]
+        res += bytes((len(self.ranges),))
+        # print('RES', hex_str(res))
+        ranges = self.ranges
+        if isinstance(ranges, dict):
+            ranges = self.ranges.items()
+        for r in ranges:
+            if isinstance(r, Range):
+                set_obj = r.set
+                low = r.low
+                high = r.high
+            else:
+                set_obj = r[1]
+                low = r[0]
+                high = r[0]
+            # TODO split (or validate) negative-positive ranges
+            res += struct.pack('<HII', self._get_set_value(set_obj), low, high)
+        res += struct.pack('<H', self._get_set_value(self.default))
+        return res
+
+
 class Action3(LazyBaseSprite):
     def __init__(self, feature, ids, maps, default):
         super().__init__()
diff --git a/grf/alpine/parser.py b/grf/alpine/parser.py
new file mode 100644
index 0000000000..bfd6a4505b
--- /dev/null
+++ b/grf/alpine/parser.py
@@ -0,0 +1,437 @@
+import struct
+
+import ply.lex
+import ply.yacc
+
+OP_ADD = 0x00
+OP_SUB = 0x01
+OP_MIN = 0x02
+OP_MAX = 0x03
+OP_MINU = 0x04
+OP_MAXU = 0x05
+OP_MUL = 0x0A
+OP_BINAND = 0x0B
+OP_BINOR = 0x0C
+OP_BINXOR = 0x0D
+OP_TSTO = 0x0E
+OP_INIT = 0x0F
+OP_PSTO = 0x10
+OP_ROT = 0x11
+OP_CMP = 0x12
+OP_CMPU = 0x13
+OP_SHL = 0x14
+OP_SHRU = 0x15
+OP_SHR = 0x16
+
+OPERATORS = {
+    OP_ADD: ('{a} + {b}', 5, False),
+    OP_SUB: ('{a} - {b}', 5, True),
+    OP_MIN: ('min({a}, {b})', 7, False),
+    OP_MAX: ('max({a}, {b})', 7, False),
+    OP_MINU: ('minu({a}, {b})', 7, False),
+    OP_MAXU: ('maxu({a}, {b})', 7, False),
+    OP_MUL: ('{a} * {b}', 6, False),
+    OP_BINAND: ('{a} & {b}', 4, True),
+    OP_BINOR: ('{a} | {b}', 4, True),
+    OP_BINXOR: ('{a} ^ {b}', 4, True),
+    OP_TSTO: ('TEMP[{b}] = {a}', 2, True),
+    OP_INIT: (None, 1, False),
+    OP_PSTO: ('PERM[{b}] = {a}', 2, True),
+    OP_ROT: ('rot({a}, {b})', 7, False),
+    OP_CMP: ('cmp({a}, {b})', 7, False),
+    OP_CMPU: ('cmpu({a}, {b})', 7, False),
+    OP_SHL: ('{a} << {b}', 4, True),
+    OP_SHRU: ('{a} u>> {b}', 4, True),
+    OP_SHR: ('{a} >> {b}', 4, True),
+}
+
+DEFAULT_INDENT_STR = '    '
+
+
+class Node:
+    def __init__(self):
+        pass
+
+    def _make_node(self, value):
+        if isinstance(value, int):
+            return Value(value)
+        assert isinstance(value, Node)
+        return value
+
+    def __add__(self, other):
+        return Expr(OP_ADD, self, self._make_node(other))
+
+    def __sub__(self, other):
+        return Expr(OP_SUB, self, self._make_node(other))
+
+    def store_temp(self, register):
+        return Expr(OP_TSTO, self, self._make_node(register))
+
+    def store_perm(self, register):
+        return Expr(OP_PSTO, self, self._make_node(register))
+
+    def format(self, parent_priority=0):
+        raise NotImplementedError
+
+    def __str__(self):
+        return '\n'.join(self.format())
+
+    def __repr__(self):
+        return '; '.join(self.format())
+
+    def compile(self, register, shift=0, and_mask=0xffffffff):
+        raise NotImplementedError
+
+
+class Expr(Node):
+    def __init__(self, op, a, b):
+        self.op = op
+        self.a = a
+        self.b = b
+
+    def format(self, parent_priority=0):
+        if self.op in OPERATORS:
+            fmt, prio, bracket = OPERATORS[self.op]
+        else:
+            fmt, prio, bracket = f'{{a}} <{self.op:02x}> {{b}}', 1, True
+
+        ares = self.a.format(prio - 1)
+        bres = self.b.format(prio - int(not bracket))
+        assert len(bres) == 1, bres
+
+        if self.op == OP_INIT:
+            ares.append(bres[0])
+            return ares
+
+        res = fmt.format(a=ares[-1], b=bres[-1])
+        if prio <= parent_priority:
+            res = f'({res})'
+        ares[-1] = res
+        return ares
+
+    def compile(self, register, shift=0, and_mask=0xffffffff):
+        is_value, b_code = self.b.compile(register, shift, and_mask)
+        if is_value:
+            # Second arg is a simple value, do operation directly
+            res = self.a.compile(register, shift, and_mask)[1]
+            res += bytes((self.op,))
+            res += b_code
+            return False, res
+
+        # Calculate secord arg first and store in in a temp var
+        res += b_code
+        res += struct.pack('<BBBIB', OP_TSTO, 0x1a, 0x20, register, OP_INIT)
+        res += self.a.compile(register + 1, shift, and_mask)[1]
+        res += struct.pack('<BBBI', self.op, 0x7d, 0x20, 0xffffffff)
+        return False, res
+
+
+class Value(Node):
+    def __init__(self, value):
+        super().__init__()
+        self.value = value
+
+    def format(self, parent_priority=0):
+        return [str(self.value)]
+
+    def compile(self, register, shift=0, and_mask=0xffffffff):
+        assert shift < 0x20, shift
+        assert and_mask <= 0xffffffff, and_mask
+        valueadj = (self.value >> shift) & and_mask
+        return True, struct.pack('<BBI', 0x1a, 0x20, valueadj)
+
+
+class Var(Node):
+    def __init__(self, name):
+        super().__init__()
+        self.name = name
+
+    def format(self, parent_priority=0):
+        return [self.name]
+
+    def compile(self, register, shift=0, and_mask=0xffffffff):
+        var_data = VARS = {
+            'tile_slope': (0x41, 8, 0x1f)
+        }.get(self.name)
+        if var_data is None:
+            raise ValueError(f'Unknown variable `{self.name}`')
+        and_mask &= var_data[2] >> shift
+        shift += var_data[1]
+        assert shift < 0x20, shift
+        assert and_mask <= 0xffffffff, and_mask
+        return True, struct.pack('<BBI', var_data[0], 0x20 | shift, and_mask)
+
+
+class Temp(Node):
+    def __init__(self, register):
+        super().__init__()
+        self.register = register
+
+    def format(self, parent_priority=0):
+        return [f'TEMP[{self.register}]']
+
+    def compile(self, register, shift=0, and_mask=0xffffffff):
+        assert shift < 0x20, shift
+        assert and_mask <= 0xffffffff, and_mask
+        return True, struct.pack('<BBI', 0x7d, 0x20 | shift, and_mask)
+
+
+class Perm(Node):
+    def __init__(self, register):
+        super().__init__()
+        self.register = register
+
+    def format(self, parent_priority=0):
+        return [f'PERM[{self.register}]']
+
+    def compile(self, register, shift=0, and_mask=0xffffffff):
+        assert shift < 0x20, shift
+        assert and_mask <= 0xffffffff, and_mask
+        return True, struct.pack('<BBI', 0x7c, 0x20 | shift, and_mask)
+
+
+class Call(Node):
+    def __init__(self, subroutine):
+        assert 0 <= subroutine < 256, subroutine
+        self.subroutine = subroutine
+
+    def format(self, parent_priority=0):
+        return [f'call({self.subroutine})']
+
+    def compile(self, register, shift=0, and_mask=0xffffffff):
+        assert shift < 0x20, shift
+        assert and_mask <= 0xffffffff, and_mask
+        return True, struct.pack('<BBBI', 0x7e, self.subroutine, 0x20 | shift, and_mask)
+
+
+tokens = (
+    'NAME', 'NUMBER', 'NEWLINE',
+    'ADD', 'SUB', 'MUL',
+    'BINAND', 'BINOR', 'BINXOR',
+    'ASSIGN', 'COMMA',
+    'LPAREN', 'RPAREN', 'LBRACKET', 'RBRACKET',
+)
+
+# Tokens
+
+t_ADD = r'\+'
+t_SUB = r'-'
+t_MUL = r'\*'
+# t_DIV = r'/'
+# t_MOD = r'%'
+t_BINAND = r'\&'
+t_BINOR = r'\|'
+t_BINXOR = r'\^'
+t_ASSIGN = r'='
+t_COMMA = r','
+t_LPAREN = r'\('
+t_RPAREN = r'\)'
+t_LBRACKET = r'\['
+t_RBRACKET = r'\]'
+t_NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
+
+
+def t_NUMBER(t):
+    r'\d+'
+    try:
+        t.value = int(t.value)
+    except ValueError:
+        print("Integer value too large %d", t.value)
+        t.value = 0
+    return t
+
+
+# Ignored characters
+t_ignore = ' \t'
+
+
+def t_NEWLINE(t):
+    r'\n+'
+    t.lexer.lineno += t.value.count("\n")
+    return t
+
+
+def t_error(t):
+    print("Illegal character '%s'" % t.value[0])
+    t.lexer.skip(1)
+
+
+# Parsing rules
+
+precedence = (
+    ('left', 'BINOR'),
+    ('left', 'BINXOR'),
+    ('left', 'BINAND'),
+    ('left', 'ADD', 'SUB'),
+    ('left', 'MUL'),
+    # ('right', 'UMINUS'),
+)
+
+
+def p_lines(t):
+    '''lines : line
+             | expression
+             | lines line
+    '''
+    # print('LINES', t[1])
+    if len(t) == 2:
+        lines, line = [], t[1]
+    else:
+        lines, line = t[1], t[2]
+
+    if line is not None:
+        lines.append(line)
+    t[0] = lines
+
+
+def p_line(t):
+    '''line : expression NEWLINE
+            | NEWLINE
+    '''
+    # print('LINE', t[1], len(t))
+    if len(t) == 2:
+        t[0] = None
+    else:
+        t[0] = t[1]
+
+
+# def p_statement_expr(t):
+#     'statement : expression'
+#     t[0] = t[1]
+
+
+# def p_storagge(t):
+#     'storage : NAME LBRACKET NUMBER RBRACKET'
+#     storage = {
+#         'TEMP': grf.Temp,
+#         'PERM': grf.Perm,
+#     }.get(t[1])
+#     assert storage is not None, t[1]
+#     register = int(t[3])
+
+#     t[0] = storage(grf.Value(register))
+
+
+def p_expression_binop(t):
+    '''expression : expression ADD expression
+                  | expression SUB expression
+                  | expression MUL expression
+                  | expression BINAND expression
+                  | expression BINOR expression
+                  | expression BINXOR expression
+    '''
+    op = {
+        '+': OP_ADD,
+        '-': OP_SUB,
+        '*': OP_MUL,
+        '&': OP_BINAND,
+        '|': OP_BINOR,
+        '^': OP_BINXOR,
+    }.get(t[2])
+
+    assert op is not None, t[2]
+    # print(op, t[1], t[3])
+    t[0] = Expr(op, t[1], t[3])
+
+
+# def p_storagge(t):
+#     'storage : NAME LBRACKET NUMBER RBRACKET'
+#     storage = {
+#         'TEMP': grf.Temp,
+#         'PERM': grf.Perm,
+#     }.get(t[1])
+#     assert storage is not None, t[1]
+#     register = int(t[3])
+
+#     t[0] = storage(grf.Value(register))
+
+
+def p_expression_assign(t):
+    'expression : NAME LBRACKET NUMBER RBRACKET ASSIGN expression'
+    assert t[1] in ('TEMP', 'PERM'), t[1]
+    op = OP_TSTO if t[1] == 'TEMP' else OP_PSTO
+    register = int(t[3])
+    t[0] = Expr(op, t[6], Value(register))
+
+
+# def p_expression_uminus(t):
+#     'expression : SUB expression %prec UMINUS'
+#     t[0] = -t[2]
+
+def p_expression_call1(t):
+    'expression : NAME LPAREN NUMBER RPAREN'
+    assert t[1] == 'call', t[1]
+    t[0] = Call(int(t[3]))
+
+
+def p_expression_call2(t):
+    'expression : NAME LPAREN expression COMMA expression RPAREN'
+    op = {
+        'min': OP_MIN,
+        'max': OP_MAX,
+        'minu': OP_MINU,
+        'maxu': OP_MAXU,
+        'rot': OP_ROT,
+        'cmp': OP_CMP,
+        'cmpu': OP_CMPU,
+    }.get(t[1])
+    assert op is not None, t[1]
+    t[0] = Expr(op, t[3], t[5])
+
+
+def p_expression_group(t):
+    'expression : LPAREN expression RPAREN'
+    t[0] = t[2]
+
+
+def p_expression_storage(t):
+    'expression : NAME LBRACKET NUMBER RBRACKET'
+    assert t[1] in ('TEMP', 'PERM'), t[1]
+    cls = Temp if t[1] == 'TEMP' else Perm
+    register = int(t[3])
+    t[0] = cls(Value(register))
+
+
+def p_expression_number(t):
+    'expression : NUMBER'
+    t[0] = Value(int(t[1]))
+
+
+def p_expression_name(t):
+    'expression : NAME'
+    t[0] = Var(t[1])
+
+
+def p_error(t):
+    # stack_state_str = ' '.join([symbol.type for symbol in parser.symstack][1:])
+
+    # print('Syntax error in input! Parser State:{} {} . {}'
+    #       .format(parser.state,
+    #               stack_state_str,
+    #               t))
+
+    if t is None:
+        print("Unexpected syntax error")
+        return
+
+    print(f'Syntax error at `{t.value}` line {t.lineno}')
+
+
+def parse_code(code):
+    lexer = ply.lex.lex()
+    parser = ply.yacc.yacc()
+    return parser.parse(code)
+
+
+if __name__ == "__main__":
+    res = parse_code('''
+        TEMP[128] = (cmp(tile_slope, 30) & 1) * 18
+        TEMP[129] = (cmp(tile_slope, 29) & 1) * 15
+        TEMP[130] = (cmp(tile_slope, 27) & 1) * 17
+        TEMP[131] = (cmp(tile_slope, 23) & 1) * 16
+        TEMP[132] = min(cmp(tile_slope, 0), 1)
+        TEMP[134] = (min((cmp(tile_slope, 14) ^ 2), 1) & TEMP[132]) * tile_slope + TEMP[131] + TEMP[130] + TEMP[129] + TEMP[128]
+    ''')
+
+    for line in res:
+        print(line.format())
diff --git a/grf/alpine/parsetab.py b/grf/alpine/parsetab.py
new file mode 100644
index 0000000000..27234cb13d
--- /dev/null
+++ b/grf/alpine/parsetab.py
@@ -0,0 +1,48 @@
+
+# parsetab.py
+# This file is automatically generated. Do not edit.
+# pylint: disable=W,C,R
+_tabversion = '3.10'
+
+_lr_method = 'LALR'
+
+_lr_signature = 'leftBINORleftBINXORleftBINANDleftADDSUBleftMULADD ASSIGN BINAND BINOR BINXOR COMMA LBRACKET LPAREN MUL NAME NEWLINE NUMBER RBRACKET RPAREN SUBlines : line\n             | expression\n             | lines line\n    line : expression NEWLINE\n            | NEWLINE\n    expression : expression ADD expression\n                  | expression SUB expression\n                  | expression MUL expression\n                  | expression BINAND expression\n                  | expression BINOR expression\n                  | expression BINXOR expression\n    expression : NAME LBRACKET NUMBER RBRACKET ASSIGN expressionexpression : NAME LPAREN NUMBER RPARENexpression : NAME LPAREN expression COMMA expression RPARENexpression : LPAREN expression RPARENexpression : NAME LBRACKET NUMBER RBRACKETexpression : NUMBERexpression : NAME'
+    
+_lr_action_items = {'NEWLINE':([0,1,2,3,4,5,6,8,9,10,20,21,22,23,24,25,29,30,31,35,36,],[4,4,-1,10,-5,-18,-17,-3,10,-4,-6,-7,-8,-9,-10,-11,-15,-16,-13,-12,-14,]),'NAME':([0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,18,20,21,22,23,24,25,29,30,31,32,33,35,36,],[5,5,-1,-2,-5,-18,-17,5,-3,-4,5,5,5,5,5,5,5,-6,-7,-8,-9,-10,-11,-15,-16,-13,5,5,-12,-14,]),'LPAREN':([0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,18,20,21,22,23,24,25,29,30,31,32,33,35,36,],[7,7,-1,-2,-5,18,-17,7,-3,-4,7,7,7,7,7,7,7,-6,-7,-8,-9,-10,-11,-15,-16,-13,7,7,-12,-14,]),'NUMBER':([0,1,2,3,4,5,6,7,8,10,11,12,13,14,15,16,17,18,20,21,22,23,24,25,29,30,31,32,33,35,36,],[6,6,-1,-2,-5,-18,-17,6,-3,-4,6,6,6,6,6,6,26,27,-6,-7,-8,-9,-10,-11,-15,-16,-13,6,6,-12,-14,]),'$end':([1,2,3,4,5,6,8,10,20,21,22,23,24,25,29,30,31,35,36,],[0,-1,-2,-5,-18,-17,-3,-4,-6,-7,-8,-9,-10,-11,-15,-16,-13,-12,-14,]),'ADD':([3,5,6,9,19,20,21,22,23,24,25,27,28,29,30,31,34,35,36,],[11,-18,-17,11,11,-6,-7,-8,11,11,11,-17,11,-15,-16,-13,11,11,-14,]),'SUB':([3,5,6,9,19,20,21,22,23,24,25,27,28,29,30,31,34,35,36,],[12,-18,-17,12,12,-6,-7,-8,12,12,12,-17,12,-15,-16,-13,12,12,-14,]),'MUL':([3,5,6,9,19,20,21,22,23,24,25,27,28,29,30,31,34,35,36,],[13,-18,-17,13,13,13,13,-8,13,13,13,-17,13,-15,-16,-13,13,13,-14,]),'BINAND':([3,5,6,9,19,20,21,22,23,24,25,27,28,29,30,31,34,35,36,],[14,-18,-17,14,14,-6,-7,-8,-9,14,14,-17,14,-15,-16,-13,14,14,-14,]),'BINOR':([3,5,6,9,19,20,21,22,23,24,25,27,28,29,30,31,34,35,36,],[15,-18,-17,15,15,-6,-7,-8,-9,-10,-11,-17,15,-15,-16,-13,15,15,-14,]),'BINXOR':([3,5,6,9,19,20,21,22,23,24,25,27,28,29,30,31,34,35,36,],[16,-18,-17,16,16,-6,-7,-8,-9,16,-11,-17,16,-15,-16,-13,16,16,-14,]),'LBRACKET':([5,],[17,]),'RPAREN':([5,6,19,20,21,22,23,24,25,27,29,30,31,34,35,36,],[-18,-17,29,-6,-7,-8,-9,-10,-11,31,-15,-16,-13,36,-12,-14,]),'COMMA':([5,6,20,21,22,23,24,25,27,28,29,30,31,35,36,],[-18,-17,-6,-7,-8,-9,-10,-11,-17,32,-15,-16,-13,-12,-14,]),'RBRACKET':([26,],[30,]),'ASSIGN':([30,],[33,]),}
+
+_lr_action = {}
+for _k, _v in _lr_action_items.items():
+   for _x,_y in zip(_v[0],_v[1]):
+      if not _x in _lr_action:  _lr_action[_x] = {}
+      _lr_action[_x][_k] = _y
+del _lr_action_items
+
+_lr_goto_items = {'lines':([0,],[1,]),'line':([0,1,],[2,8,]),'expression':([0,1,7,11,12,13,14,15,16,18,32,33,],[3,9,19,20,21,22,23,24,25,28,34,35,]),}
+
+_lr_goto = {}
+for _k, _v in _lr_goto_items.items():
+   for _x, _y in zip(_v[0], _v[1]):
+       if not _x in _lr_goto: _lr_goto[_x] = {}
+       _lr_goto[_x][_k] = _y
+del _lr_goto_items
+_lr_productions = [
+  ("S' -> lines","S'",1,None,None,None),
+  ('lines -> line','lines',1,'p_lines','parser.py',272),
+  ('lines -> expression','lines',1,'p_lines','parser.py',273),
+  ('lines -> lines line','lines',2,'p_lines','parser.py',274),
+  ('line -> expression NEWLINE','line',2,'p_line','parser.py',288),
+  ('line -> NEWLINE','line',1,'p_line','parser.py',289),
+  ('expression -> expression ADD expression','expression',3,'p_expression_binop','parser.py',316),
+  ('expression -> expression SUB expression','expression',3,'p_expression_binop','parser.py',317),
+  ('expression -> expression MUL expression','expression',3,'p_expression_binop','parser.py',318),
+  ('expression -> expression BINAND expression','expression',3,'p_expression_binop','parser.py',319),
+  ('expression -> expression BINOR expression','expression',3,'p_expression_binop','parser.py',320),
+  ('expression -> expression BINXOR expression','expression',3,'p_expression_binop','parser.py',321),
+  ('expression -> NAME LBRACKET NUMBER RBRACKET ASSIGN expression','expression',6,'p_expression_assign','parser.py',350),
+  ('expression -> NAME LPAREN NUMBER RPAREN','expression',4,'p_expression_call1','parser.py',362),
+  ('expression -> NAME LPAREN expression COMMA expression RPAREN','expression',6,'p_expression_call2','parser.py',368),
+  ('expression -> LPAREN expression RPAREN','expression',3,'p_expression_group','parser.py',383),
+  ('expression -> NAME LBRACKET NUMBER RBRACKET','expression',4,'p_expression_storage','parser.py',388),
+  ('expression -> NUMBER','expression',1,'p_expression_number','parser.py',396),
+  ('expression -> NAME','expression',1,'p_expression_name','parser.py',401),
+]
diff --git a/grf/alpine/readgrftest.py b/grf/alpine/readgrftest.py
index fd6bf71baa..7971db3a03 100644
--- a/grf/alpine/readgrftest.py
+++ b/grf/alpine/readgrftest.py
@@ -2,7 +2,7 @@ import sys
 import struct
 from nml import lz77
 
-from grf import Node, Expr, Value
+from grf import Node, Expr, Value, Var, Temp, Perm, Range, Set, Call
 
 
 def hex_str(s):
@@ -270,33 +270,6 @@ def read_sprite_layout_registers(d, flags, is_parent):
     return regs
 
 
-class Set:
-    def __init__(self, set_id):
-        self.is_callback = bool(set_id & 0x8000)
-        self.set_id = set_id & 0x7fff
-
-    def __str__(self):
-        if self.is_callback:
-            return f'CB({self.set_id})'
-        return f'Set({self.set_id})'
-
-    __repr__ = __str__
-
-
-class Range:
-    def __init__(self, low, high, set):
-        self.set = set
-        self.low = low
-        self.high = high
-
-    def __str__(self):
-        if self.low == self.high:
-            return f'{self.low} -> {self.set}'
-        return f'{self.low}..{self.high} -> {self.set}'
-
-    __repr__ = __str__
-
-
 def read_sprite_layout(d, num, no_z_position):
     has_z_position = not no_z_position
     has_flags = bool((num >> 6) & 1)
@@ -427,11 +400,6 @@ def get_va2_var(var):
     return V2_OBJECT_VARS[var]
 
 
-class Call(Node):
-    def __init__(self, subroutine):
-        self.suroutine = subroutine
-
-
 class Generic(Node):
     def __init__(self, var, shift, and_mask, type, add_val, divmod_val):
         self.var = var
@@ -441,13 +409,13 @@ class Generic(Node):
         self.add_val = add_val
         self.divmod_val = divmod_val
 
-    def format(self, parent_priority=0, indent=0, indent_str='   '):
+    def format(self, parent_priority=0):
         addstr = ''
         if self.type == 1:
-            addstr = ' +{self.add_val} /{self.divmod_val}'
+            addstr = f' +{self.add_val} /{self.divmod_val}'
         elif self.type == 2:
-            addstr = ' +{self.add_val} %{self.divmod_val}'
-        return (indent_str * indent) + f'(var: {self.var} >>{self.shift} &{self.and_mask}{addstr})'
+            addstr = f' +{self.add_val} %{self.divmod_val}'
+        return [f'(var{self.var:02x} >>{self.shift} &{self.and_mask:x}{addstr})']
 
 
 def decode_action2(data):
@@ -466,7 +434,7 @@ def decode_action2(data):
             print(f'BASIC ground_sprite:{ground_sprite} building_sprite:{building_sprite} '
                   f'xofs:{xofs} yofs:{yofs} extent:({xext}, {yext}, {zext})')
             return
-        if num_ent1 < 0x3f:
+        if num_ent1 <= 0x3f:
             raise NotImplemented
 
         if num_ent1 in (0x81, 0x82, 0x85, 0x86, 0x89, 0x8a):
@@ -486,6 +454,7 @@ def decode_action2(data):
                 has_more = bool(varadj & 0x20)
                 node_type = varadj >> 6
                 and_mask = d.get_var(group_size)
+                # print(f'CODE op:{op:x} var{var:02x} >>{shift} &{and_mask:x} has_more:{has_more} node_type:{node_type}')
                 if node_type != 0:
                     # old magic, use advaction2 instead
                     add_val = d.get_var(group_size)
@@ -493,6 +462,14 @@ def decode_action2(data):
                     node = Generic(var, shift, and_mask, node_type, add_val, divmod_val)
                 elif var == 0x1a and shift == 0:
                     node = Value(and_mask)
+                elif (var, shift, and_mask) == (0x7c, 0, 0xffffffff):
+                    node = Perm(param)
+                elif (var, shift, and_mask) == (0x7d, 0, 0xffffffff):
+                    node = Temp(param)
+                elif (var, shift, and_mask) == (0x7e, 0, 0xffffffff):
+                    node = Call(param)
+                elif (var, shift, and_mask) == (0x41, 8, 0x1f):
+                    node = Var('tile_slope')
                 else:
                     node = Generic(var, shift, and_mask, 0, None, None)
 
@@ -533,8 +510,8 @@ def decode_action2(data):
             #     if a['type'] != 0:
             #         type_str = '+{add_val} /%{divmod_val}'.format(**a)
             #     print(f'   op<{a["op"]}>:{op} var<{var:02x}>:{name}({fmt}){param_str} type:{a["type"]} >>{a["shift_num"]} &{a["and_mask"]:x}{type_str}')
-            print()
-            print(root.format(indent=1))
+            for line in root.format():
+                print('        ', line)
             return
 
         layout = read_sprite_layout(d, max(num_ent1, 1), num_ent1 == 0)
@@ -684,6 +661,7 @@ ACTIONS = {
     0x14: decode_action14,
 }
 
+
 def read_pseudo_sprite(f, nfo_line):
     l = struct.unpack('<I', f.read(4))[0]
     if l == 0:
@@ -699,6 +677,7 @@ def read_pseudo_sprite(f, nfo_line):
             decoder(data[1:])
     return True
 
+
 def decode_sprite(f, num):
     data = b''
     while num > 0:
@@ -720,6 +699,7 @@ def decode_sprite(f, num):
     if num != 0: raise RuntimeError('Corrupt sprite')
     return data
 
+
 def read_real_sprite(f):
     sprite_id = struct.unpack('<I', f.read(4))[0]
     if sprite_id == 0:
@@ -742,6 +722,7 @@ def read_real_sprite(f):
     f.seek(start_pos + num - 1, 0)
     return True
 
+
 with open(sys.argv[1], 'rb') as f:
     print('Header:', hex_str(f.read(10)))
     data_offest, compression = struct.unpack('<IB', f.read(5))