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|
from ply import lex
from ply import yacc
def expand(lst,variables):
newlst = []
for item in lst:
if isinstance(item, list):
strlst = com_interp(item[0],variables)
netlst += expand(strlst,variables)
else:
newlst.append(item)
return newlst
def com_interp(string,variables):
tokens = (
"COMMAND",
"COMMA",
"COL",
"EQ",
"TEXT",
"PERCENT",
)
states = (
("ccode", "exclusive"), #command code
)
# Match the first $(. Enter ccode state.
def t_ccode(t):
r'\$(\{|\()'
t.lexer.code_start = t.lexer.lexpos # Record the starting position
t.lexer.level = 1 # Initial level
t.lexer.begin('ccode') # Enter 'ccode' state
# Rules for the ccode state
def t_ccode_newcom(t):
r'\$(\{|\()'
t.lexer.level +=1
def t_ccode_endcom(t):
r'(\}|\))'
t.lexer.level -=1
# If closing command, return the code fragment
if t.lexer.level == 0:
t.value = t.lexer.lexdata[t.lexer.code_start:t.lexer.lexpos-1]
t.type = "COMMAND"
t.lexer.begin('INITIAL')
return t
def t_ccode_text(t):
"[^\$\(\{\)\}]"
def t_PERCENT(t):
r"\%"
return t
def t_EQ(t):
r"="
return t
def t_COMMA(t):
r","
return t
def t_COL(t):
r":"
return t
def t_TEXT(t):
r"[^ \n\t:=\\,]+"
return t
def t_spacetab(t):
r"[ \t]"
pass
def t_ANY_error(t):
print("Illegal character '%s'" % t.value[0])
t.lexer.skip(1)
lexer = lex.lex()
lexer.input(string)
#for tok in lexer:
# print(tok)
tokens = []
for tok in lexer:
tokens += [tok.value]
if len(tokens) == 1:
if tokens[0] in variables:
return variables[tokens[0]]
else:
return []
#YACC stuff begins here
def p_tonewstr(p):
"""
newstr : getstr EQ TEXT PERCENT TEXT
| getstr EQ PERCENT TEXT
| getstr EQ TEXT PERCENT
| getstr EQ PERCENT
| getstr EQ TEXT
"""
newtextlist = []
if p[1] == []:
p[0] = p[1]
elif len(p) == 6:
for text in p[1]:
newtextlist.append(p[3] + text + p[5])
p[0] = newtextlist
elif len(p) == 5:
if p[3] == "%":
for text in p[1]:
newtextlist.append(text + p[4])
p[0] = newtextlist
else:
for text in p[1]:
newtextlist.append(p[3] + text)
p[0] = newtextlist
elif p[3] == "%":
p[0] = p[1]
else:
for text in p[1]:
newtextlist.append(text + p[3])
p[0] = newtextlist
def p_getstr(p):
"""
getstr : TEXT COL TEXT PERCENT TEXT
| TEXT COL PERCENT TEXT
| TEXT COL TEXT PERCENT
| TEXT COL PERCENT
| TEXT COL TEXT
"""
if not p[1] in variables:
p[0] = []
else:
textlst = expand(variables[p[1]]): #make sure it's expanded
newtextlst = []
if len(p) == 6:
l1 = len(p[3]) #length of str1
l2 = len(p[5])
for text in textlst
if p[3] == text[0:l1] and p[5] == text[-l2:]:
newtextlst.append(text[l1:-l2])
p[0] = newtextlst
elif len(p) == 5:
if p[3] == "%":
l1 = len(p[4])
for text in textlst
if p[4] == text[-l1:]
newtextlst.append(text[:-l1])
p[0] = newtextlst
else:
l1 = len(p[3])
for text in textlst
if p[3] == text[0:l1]
newtextlst.append(text[l1:])
p[0] = newtextlst
elif p[3] == "%":
p[0] = textlst
else:
l1 = len(p[3])
for text in textlst
if p[3] == text[-l1:]
newtextlst.append(text[:-l1])
p[0] = newtextlst
com_interp("HELOO",{"HELOO":["mupp"]})
|
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