Python-сообщество

# -*- coding: utf-8
from ply import lex
from ply import yacc

raw = '#sec x =-12.57 y=2203 z=337.304 #sec abc=232'

tokens = ('SEC', 'VAR', 'DIG', 'EQ', 'SIG', 'DOT')
t_VAR =     r'[a-z_]+'
t_EQ =      r'='
t_DIG =     r'[0-9]+'
t_SEC =     r'\#sec'
t_SIG =     r'[+-]'
t_DOT =     '.'
t_ignore =  ' \t'

def t_error(t):
    print "Parse error at '%s'" % t.value

def p_product(p):
    """ 
    prod : prod sec
    prod : sec
    """
    if len(p) == 2: p[0] = [p[1]]
    if len(p) == 3: p[0] = p[1] + [p[2]]

def p_sec(p):
    """
    sec : SEC
        | sec expr
    """
    if len(p) == 2: p[0] = []
    if len(p) == 3: p[0] = p[1] + [p[2]]
        
def p_expr(p):
    """
    expr : VAR EQ num
    """
    p[0] = (p[1], p[3])

def p_num(p):
    """
    num     : DIG 
            | SIG num 
            | DIG DOT DIG
    """
    if len(p) == 2: p[0] = p[1]
    if len(p) == 3: p[0] = p[1] + p[2]
    if len(p) == 4: p[0] = p[1] + p[2] + p[3]

def p_error(p):
    print "Syntax error at '%s'" % p.value

lexer = lex.lex()
parser = yacc.yacc()
print parser.parse(raw)