compiles_to.vm

        ; Token('SYM', 'nop')

        ; Token('SYM', 'nop')

04 01   ; Token('DOT', '.')

02 1    ; Token('NUM', '1')
02 2    ; Token('NUM', '2')
02 3    ; Token('NUM', '3')
07      ; Token('MUL', '*')
05      ; Token('ADD', '+')

04 01   ; Token('DOT', '.')

00      ; Token('SYM', 'bye')

Rply_compiler.py

# for https://www.youtube.com/watch?v=v6y-57zw3zg

src = '''
nop
nop
.
1 + 2 * 3
.
bye
'''

D = [] # data stack
R = [] # return stack

# parser for RPython/Rply @ https://rply.readthedocs.io/en/latest/

from rply import LexerGenerator
lg = LexerGenerator()
lg.add('NUM','[0-9]+')
lg.add('DOT','\.')
lg.add('ADD','\+')
lg.add('MUL','\*')
lg.add('SYM','[a-zA-Z0-9_\.]+')
lg.ignore('\s+')
lexer = lg.build()

from rply import ParserGenerator
pg = ParserGenerator(['SYM','NUM','DOT','ADD','MUL'],
	precedence=(('left',['ADD']),('left',['MUL']),))

@pg.production(' REPL : ')
def p_REPL(p): pass
@pg.production(' REPL : REPL ex ')
def p_REPL_recur(p): print p[1]

@pg.production(' ex : SYM ')
def ex_SYM(p):
	cmd = {'nop':'','bye':'00'}
	return '%s\t; %s\n'%(cmd[p[0].value],p[0])

@pg.production(' ex : NUM ')
def ex_NUM(p): return '02 %s\t; %s\n'%(p[0].value,p[0])

@pg.production(' ex : DOT ')
def ex_DOT(p): return '04 01\t; %s\n'%(p[0])

@pg.production(' ex : ex ADD ex ')
def ex_ADD(p): return p[0]+p[2]+'05\t; %s\n'%p[1]

@pg.production(' ex : ex MUL ex ')
def ex_MUL(p): return p[0]+p[2]+'07\t; %s\n'%p[1]

@pg.error
def p_error(p): raise BaseException('error %s'%p)

parser = pg.build()

def main(argv):
	print
#	for i in parser.parse(lexer.lex(src)): print i
	parser.parse(lexer.lex(src))
	return 0

def target(*args): return main,None

import sys
if __name__ == '__main__':
	main(sys.argv)