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|
from ply import lex
from ply import yacc
def parseif(ifoptions):
optstr = ""
for option in ifoptions:
optstr += option + " "
tokens = (
"NOT",
"AND",
"OR",
"EQ",
"NEQ",
"NONZERO",
"SEMICOL",
"LBRAC",
"RPRAC",
"OPT",
"TEST",
)
def t_TEST(t):
r"test"
return t
def t_AND(t):
r"(\-a|\&\&)"
return t
def t_OR(t):
r"(\-o|\|\|)"
return t
def t_EQ(t):
r"="
return t
def t_NEQ(t):
r"\!="
return t
def t_NOT(t):
r"\!"
return t
def t_NONZERO(t):
r"\-n"
return t
def t_SEMICOL(t):
r";"
pass
def t_LBRAC(t):
r"\{"
return t
def t_RPRAC(t):
r"\}"
return t
def t_space(t):
r"[ \t\n]"
pass
def t_quote(t):
r"[\"\']"
pass
def t_OPT(t):
r"[^ \t\n;\"\']+"
return t
def t_ANY_error(t):
print("Illegal character '%s'" % t.value[0],t.lexer.lineno)
t.lexer.skip(1)
lexer = lex.lex()
#lexer.input(optstr)
#for tok in lexer:
# print(tok)
#YACC
#Add more cases!
def p_exp(p):
"""
exp : NOT TEST expopt
| TEST expopt
"""
if len(p) == 4:
newlst = []
while len(newlst) < len(p[3]):
if p[3][len(newlst)+1][0] == "!":
newresult = p[3][len(newlst)+1][1:]
else:
newresult = "!" + p[3][len(newlst)+1]
newlst += [p[3][len(newlst)],newresult]
p[0] = newlst
else:
p[0] = p[2]
def p_expopt(p):
"""
expopt : expopt AND expopt
| expopt OR expopt
"""
if p[2] == "-a":
p[0] = p[1] + p[3]
else: #come up with something better
p[0] = p[1] + p[3]
def p_expopt2(p):
"""
expopt : OPT EQ OPT
| OPT NEQ OPT
| NONZERO OPT
| OPT
"""
if p[2] == "=":
varstr = p[1].split("$")
p[0] = [varstr[1],p[3][len(varstr[0]):]]
#[VARIABLEname,value to pass test]
elif p[2] == "!=":
varstr = p[1].split("$")
p[0] = [varstr[1],"!" + p[3][len(varstr[0]):]]
else:
varstr = p[len(p)-1].split("$")[1]
p[0] = [varstr, "!"] #req that the variable is nonzero to be True
def p_error(p):
print("syntax error at '%s'" % p.type,p.value)
pass
yacc.yacc()
return yacc.parse(optstr)
|
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