1 files changed, 91 insertions, 0 deletions
diff --git a/nandgame/assembler/py_nand_ass/lexer.py b/nandgame/assembler/py_nand_ass/lexer.py
new file mode 100755
index 0000000..e55ab05
--- /dev/null
+++ b/nandgame/assembler/py_nand_ass/lexer.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python3
+
+import ply.lex as lex
+
+# List of token names.   This is always required
+tokens = (
+    "OP",
+    "JUMP",
+    "COMMA",
+    "COLON",
+    "SYMBOL",
+    "NUMBER",
+    "HEXNUMBER",
+    "DOT",
+    "REG",
+    "NL",
+)
+
+# Regular expression rules for simple tokens
+t_COMMA = r","
+t_COLON = r":"
+t_DOT = r"\."
+
+
+def t_OP(t):
+    r"and|or|xor|not|mov|add|inc|sub|dec|cmp|neg|hlt|nop"
+    return t
+
+
+def t_REG(t):
+    r"\b(AD?M?|DM?|M|_)\b"
+    return t
+
+
+def t_JUMP(t):
+    r"jmp|jlt|jgt|jle|jge|jeq|jne"
+    return t
+
+
+def t_NUMBER(t):
+    r"\#\d+"
+    t.value = int(t.value[1:])
+    return t
+
+
+def t_HEXNUMBER(t):
+    r"\#0x[0-9a-fA-F]+"
+    t.value = int(t.value[1:], 16)
+    return t
+
+
+def t_SYMBOL(t):
+    r"[a-z][A-Za-z0-9_]+"
+    return t
+
+
+# Define a rule so we can track line numbers
+def t_NL(t):
+    r"\n+"
+    t.lexer.lineno += len(t.value)
+    return t
+
+
+# A string containing ignored characters (spaces and tabs)
+t_ignore = " \t"
+# t_ignore_COMMENT = r';.*'
+
+
+def t_COMMENT(t):
+    r";.*"
+    pass
+
+
+# Error handling rule
+def t_error(t):
+    print("!!! Illegal character '%s'" % t.value[0])
+    t.lexer.skip(1)
+
+
+# EOF handling rule
+def t_eof(t):
+    if not t.lexer.newline_added:
+        t.lexer.input("\n")
+        t.lexer.newline_added = True
+        return t.lexer.token()
+    return None
+
+
+# Build the lexer
+lexer = lex.lex()
+lexer.newline_added = False