def _parse_cfg(cls, cfg_str):
if len(cfg_str) == 0:
raise ValueError("invalid config!")
cfg_pairs = split_nest(cfg_str, sep=",")
cfg = {}
for p in cfg_pairs:
kv = split_nest(p, sep="=")
n = len(kv)
if n == 1:
key = kv[0]
val = True
elif n == 2:
key, val = kv
# value conversion
vl = val.lower()
if vl in ("true", "on", ""):
val = True
elif vl in ("false", "off"):
val = False
else:
raise ValueError("not a key value pair in config!")
if len(key) == 0:
raise ValueError("invalid key!")
cfg[key] = val
return cfg
def _parse_cfg(cls, cfg_str):
if len(cfg_str) == 0:
raise ValueError("invalid config!")
cfg_pairs = split_nest(cfg_str, sep=',')
cfg = {}
for p in cfg_pairs:
kv = split_nest(p, sep='=')
n = len(kv)
if n == 1:
key = kv[0]
val = True
elif n == 2:
key, val = kv
# value conversion
vl = val.lower()
if vl in ("true", "on", ""):
val = True
elif vl in ("false", "off"):
val = False
else:
raise ValueError("not a key value pair in config!")
if len(key) == 0:
raise ValueError("invalid key!")
cfg[key] = val
return cfg
def parse(cls, spec):
name = None
src_list = []
append = False
cfg = {}
# has optional config?
cfg_pos = spec.find("?")
if cfg_pos >= 0:
cfg = cls._parse_cfg(spec[cfg_pos + 1:])
spec = spec[0:cfg_pos]
# src start
col_pos = spec.find(":")
# no colon
if col_pos == -1:
name = spec
elif col_pos == len(spec) - 1:
name = spec[:-1]
# a:foo
elif col_pos > 0:
name = spec[:col_pos]
src = spec[col_pos + 1:]
if len(src) > 0:
# append src list?
if src[0] == "+":
append = True
src = src[1:]
if len(src) > 0:
src_list = split_nest(src, sep="+")
if len(src_list) == 0:
raise ValueError("empty source list!")
for src in src_list:
if len(src) == 0:
raise ValueError("contains empty source!")
else:
raise ValueError("empty source list!")
# check name
if name is None or name == "":
raise ValueError("no name in spec!")
return cls(name, src_list, cfg, append)
def parse(cls, spec):
name = None
src_list = []
append = False
cfg = {}
# has optional config?
cfg_pos = spec.find('?')
if cfg_pos >= 0:
cfg = cls._parse_cfg(spec[cfg_pos+1:])
spec = spec[0:cfg_pos]
# src start
col_pos = spec.find(':')
# no colon
if col_pos == -1:
name = spec
elif col_pos == len(spec) - 1:
name = spec[:-1]
# a:foo
elif col_pos > 0:
name = spec[:col_pos]
src = spec[col_pos+1:]
if len(src) > 0:
# append src list?
if src[0] == '+':
append = True
src = src[1:]
if len(src) > 0:
src_list = split_nest(src, sep='+')
if len(src_list) == 0:
raise ValueError("empty source list!")
for src in src_list:
if len(src) == 0:
raise ValueError("contains empty source!")
else:
raise ValueError("empty source list!")
# check name
if name is None or name == "":
raise ValueError("no name in spec!")
return cls(name, src_list, cfg, append)