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#!/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"mov|and|dec|hlt|add|sub|inc"
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
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