Add a DEC, NOP, STOP, and basic format tests

src/python/src/gbasm/gbasm.py

@@ -6,6 +6,9 @@ import sys
 
 from .instructions import Instruction
 from .instructions.inc import Inc
+from .instructions.dec import Dec
+from .instructions.nop import Nop
+from .instructions.stop import Stop
 from .arguments import ArgumentType, Argument
 
 from typing import Callable, Dict, List, Optional
@@ -16,7 +19,10 @@ COMMENT_CHAR = '#'
 LABEL_SUFFIX = ':'
 
 GB_INSTRUCTIONS = [
-    Inc()
+    Nop(),
+    Stop(),
+    Inc(),
+    Dec()
 ]
 
 def build_instruction_map() -> Dict[str, Instruction]:
@@ -88,8 +94,8 @@ def assemble(lines: str) -> bytes:
 
             # Tokenize
             tokens = line.split()
-            logging.info("Line:", line)
-            logging.info("Tokens:", tokens)
+            logging.info("Line: {}".format(line))
+            logging.info("Tokens: {}".format(tokens))
 
             if len(tokens) == 0:
                 continue

src/python/src/gbasm/instructions/dec.py

@@ -0,0 +1,49 @@
+from .Instruction import Instruction
+from ..arguments.ArgumentTypes import Register8, Register16
+from ..arguments import Argument
+from typing import Callable, List
+
+
+class Dec(Instruction):
+
+    def __init__(self):
+        argtypes = [[Register8()], [Register16()]]
+        super().__init__("DEC", argtypes)
+
+    def num_bytes(self, arguments) -> int:
+        return 1
+
+    def to_bytes(self, arguments: List[Argument],
+                 label_resolver: Callable[[str], int]) -> bytes:
+
+        if len(arguments) != 1:
+            raise ValueError("Incorrect number of arguments")
+
+        value = arguments[0].value
+
+        if value == "BC":
+            return bytes([0x0B])
+        if value == "DE":
+            return bytes([0x1B])
+        if value == "HL":
+            return bytes([0x2B])
+        if value == "SP":
+            return bytes([0x3B])
+        if value == "A":
+            return bytes([0x3D])
+        if value == "B":
+            return bytes([0x05])
+        if value == "C":
+            return bytes([0x0D])
+        if value == "D":
+            return bytes([0x15])
+        if value == "E":
+            return bytes([0x1D])
+        if value == "H":
+            return bytes([0x25])
+        if value == "L":
+            return bytes([0x2D])
+        if value == "(HL)":
+            return bytes([0x35])
+
+        raise ValueError("Unknown value: {}".format(value))

src/python/src/gbasm/instructions/nop.py

@@ -0,0 +1,21 @@
+from .Instruction import Instruction
+from ..arguments import Argument
+from typing import Callable, List
+
+
+class Nop(Instruction):
+
+    def __init__(self):
+        argtypes = [[]]
+        super().__init__("NOP", argtypes)
+
+    def num_bytes(self, arguments) -> int:
+        return 1
+
+    def to_bytes(self, arguments: List[Argument],
+                 label_resolver: Callable[[str], int]) -> bytes:
+
+        if len(arguments) != 0:
+            raise ValueError("Incorrect number of arguments")
+
+        return bytes([0x00])

src/python/src/gbasm/instructions/stop.py

@@ -0,0 +1,21 @@
+from .Instruction import Instruction
+from ..arguments import Argument
+from typing import Callable, List
+
+
+class Stop(Instruction):
+
+    def __init__(self):
+        argtypes = [[]]
+        super().__init__("STOP", argtypes)
+
+    def num_bytes(self, arguments) -> int:
+        return 1
+
+    def to_bytes(self, arguments: List[Argument],
+                 label_resolver: Callable[[str], int]) -> bytes:
+
+        if len(arguments) != 0:
+            raise ValueError("Incorrect number of arguments")
+
+        return bytes([0x10])

src/python/test/cases/format.yaml

@@ -0,0 +1,20 @@
+---
+name: two_nop
+program: |
+  NOP
+  NOP
+expected:
+  - 0x00
+  - 0x00
+---
+name: unused_labels
+program: |
+  start:
+    NOP
+  middle:
+    NOP
+  end:
+expected:
+  - 0x00
+  - 0x00
+---

src/python/test/cases/format/format.yaml

@@ -0,0 +1,19 @@
+---
+name: two_nop
+program: |
+  NOP
+  NOP
+expected:
+  - 0x00
+  - 0x00
+---
+name: unused_labels
+program: |
+  start:
+    NOP
+  middle:
+    NOP
+  end:
+expected:
+  - 0x00
+  - 0x00

src/python/test/cases/instructions/dec.yaml

@@ -0,0 +1,74 @@
+---
+name: dec_a
+program: |
+  DEC A
+expected:
+  - 0x3D
+
+---
+name: dec_b
+program: |
+  DEC B
+expected:
+  - 0x05
+---
+name: dec_c
+program: |
+  DEC C
+expected:
+  - 0x0D
+---
+name: dec_d
+program: |
+  DEC D
+expected:
+  - 0x15
+---
+name: dec_e
+program: |
+  DEC E
+expected:
+  - 0x1D
+---
+name: dec_h
+program: |
+  DEC H
+expected:
+  - 0x25
+---
+name: dec_l
+program: |
+  DEC L
+expected:
+  - 0x2D
+---
+name: dec_(hl)
+program: |
+  DEC (HL)
+expected:
+  - 0x35
+
+---
+name: dec_bc
+program: |
+  DEC BC
+expected:
+  - 0x0B
+---
+name: dec_de
+program: |
+  DEC DE
+expected:
+  - 0x1B
+---
+name: dec_hl
+program: |
+  DEC HL
+expected:
+  - 0x2B
+---
+name: dec_sp
+program: |
+  DEC SP
+expected:
+  - 0x3B

src/python/test/cases/instructions/special.yaml

@@ -0,0 +1,12 @@
+---
+name: nop
+program: |
+  NOP
+expected:
+  - 0x00
+---
+name: stop
+program: |
+  STOP
+expected:
+  - 0x10

src/python/test/test_assemble.py

@@ -6,8 +6,10 @@ import yaml
 import pytest
 import logging
 
+logging.basicConfig(format="")
 logging.getLogger().setLevel(logging.INFO)
-logging.basicConfig()
+
+logger = logging.getLogger(__name__)
 
 class AssembleCase(object):
 
@@ -17,28 +19,38 @@ class AssembleCase(object):
         self.expected = expected
 
 
-def find_case_files():
+def find_case_files(subdir: str):
     test_root = Path(os.path.dirname(os.path.abspath(__file__)))
-    case_root = test_root / "cases" / "instructions"
+    case_root = test_root / "cases" / subdir
     return case_root.glob("**/*.yaml")
 
-def get_test_cases():
+def get_test_cases(subdir: str):
     cases = []
-    files = find_case_files()
+    files = find_case_files(subdir)
     for f in files:
         index = 0
         with open(str(f), "r") as yaml_file:
             test_descs = yaml.safe_load_all(yaml_file)
             for desc in test_descs:
+                try:
                     case = AssembleCase(desc['name'], desc['program'], bytes(desc['expected']))
+                except TypeError:
+                    logger.exception("Failed to parse yaml: {}".format(desc))
                 cases.append(case)
     return cases
 
-cases = get_test_cases()
-print(cases)
-
-@pytest.mark.parametrize("case", cases, ids=[case.name for case in cases])
+instruction_cases = get_test_cases("instructions")
+@pytest.mark.parametrize("case", instruction_cases,
+                         ids=[case.name for case in instruction_cases])
 def test_assemble_instruction(case):
     lines = case.program.split("\n")
     assembled = assemble(lines)
     assert assembled == case.expected
+
+format_cases = get_test_cases("format")
+@pytest.mark.parametrize("case", format_cases,
+                         ids=[case.name for case in format_cases])
+def test_format_instruction(case):
+    lines = case.program.split("\n")
+    assembled = assemble(lines)
+    assert assembled == case.expected