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def parse_interval(s):
if not s:
return None, s
dash = False
init_s = s
buff = ""
r = [-1, -1]
i = 0
while s:
if not dash and s[0] == '-':
if buff:
r[0] = int(buff)
buff = ""
dash = True
elif s[0] in "0123456789":
buff += s[0]
else:
break
s = s[1:]
i += 1
if buff:
r[1 if dash else 0] = int(buff)
elif not buff and not dash:
return None, s, None
if not dash:
r[1] = r[0]
return tuple(r), s, init_s[:i]
def parse_range(s):
if not s:
return None, s, None
rs = []
disp = []
tc = False
while s:
r, s, d = parse_interval(s)
if r is None:
break
tc = False
rs.append(r)
disp.append(d)
if s and s[0] == ',':
s = s[1:]
tc = True
else:
break
if not rs:
return None, s, None
return tuple(rs), s, ", ".join(disp) + (", " if tc else "")
def parse_channelrange(s):
if not s:
return None, s, None
f, s, d1 = parse_range(s)
if f is None:
return None, s, None
elif not s or s[0] != ';':
return (f, ((-1,-1),)), s, d1
s = s[1:]
c, s, d2 = parse_range(s)
if c is None:
return (f, ((-1, -1),)), s, d1 + "; "
return (f, c), s, d1+"; "+d2
def parse_value(s):
if not s:
return None, s
buff = ""
while s:
if s[0] in "0123456789" and int(buff+s[0]) < 256:
buff += s[0]
s = s[1:]
else:
break
return (None if not buff else int(buff)), s, buff
def parse_num(s):
if not s:
return None, s
buff = ""
while s:
if s[0] in "0123456789":
buff += s[0]
s = s[1:]
else:
break
return (None if not buff else int(buff)), s, buff
def make_parse_letter(letter, display):
def inner(s):
if not s or s[0] != letter:
return None, s, None
return True, s[1:], display
return inner
def parse_null(s):
return True, s, ""
def parse_string(s):
if not s:
return None, s, None
buff = ""
while s:
if s[0] != ' ':
buff += s[0]
s = s[1:]
else:
if not buff:
return None, s, None
break
return buff, s, buff
def parse_quotedstring(s):
if not s:
return None, s, None
if s[0] != "'":
return None, s, None
s = s[1:]
buff = ""
bs = False
while s:
if s[0] == '\\':
buff += s[0]
bs = not bs
elif s[0] == "'":
if bs:
buff += s[0]
bs = False
else:
s = s[1:]
break
else:
buff += s[0]
bs = False
s = s[1:]
else:
return buff, s, "'"+buff
return buff, s, "'"+buff+"'"
PARSE_MAP = {
"$channel_range": parse_channelrange,
"$value": parse_value,
"$null": parse_null,
"$string": parse_string,
"$num": parse_num,
"$quoted_string": parse_quotedstring,
}
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