/usr/lib/python2.7/dist-packages/uritemplate/__init__.py is in python-uritemplate 0.6-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
URI Template (RFC6570) Processor
"""
__copyright__ = """\
Copyright 2011-2013 Joe Gregorio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
import re
try:
from urllib.parse import quote
except ImportError:
from urllib import quote
__version__ = "0.6"
RESERVED = ":/?#[]@!$&'()*+,;="
OPERATOR = "+#./;?&|!@"
MODIFIER = ":^"
TEMPLATE = re.compile("{([^\}]+)}")
def variables(template):
'''Returns the set of keywords in a uri template'''
vars = set()
for varlist in TEMPLATE.findall(template):
if varlist[0] in OPERATOR:
varlist = varlist[1:]
varspecs = varlist.split(',')
for var in varspecs:
# handle prefix values
var = var.split(':')[0]
# handle composite values
if var.endswith('*'):
var = var[:-1]
vars.add(var)
return vars
def _quote(value, safe, prefix=None):
if prefix is not None:
return quote(str(value)[:prefix], safe)
return quote(str(value), safe)
def _tostring(varname, value, explode, prefix, operator, safe=""):
if isinstance(value, list):
return ",".join([_quote(x, safe) for x in value])
if isinstance(value, dict):
keys = sorted(value.keys())
if explode:
return ",".join([_quote(key, safe) + "=" + \
_quote(value[key], safe) for key in keys])
else:
return ",".join([_quote(key, safe) + "," + \
_quote(value[key], safe) for key in keys])
elif value is None:
return
else:
return _quote(value, safe, prefix)
def _tostring_path(varname, value, explode, prefix, operator, safe=""):
joiner = operator
if isinstance(value, list):
if explode:
out = [_quote(x, safe) for x in value if value is not None]
else:
joiner = ","
out = [_quote(x, safe) for x in value if value is not None]
if out:
return joiner.join(out)
else:
return
elif isinstance(value, dict):
keys = sorted(value.keys())
if explode:
out = [_quote(key, safe) + "=" + \
_quote(value[key], safe) for key in keys \
if value[key] is not None]
else:
joiner = ","
out = [_quote(key, safe) + "," + \
_quote(value[key], safe) \
for key in keys if value[key] is not None]
if out:
return joiner.join(out)
else:
return
elif value is None:
return
else:
return _quote(value, safe, prefix)
def _tostring_semi(varname, value, explode, prefix, operator, safe=""):
joiner = operator
if operator == "?":
joiner = "&"
if isinstance(value, list):
if explode:
out = [varname + "=" + _quote(x, safe) \
for x in value if x is not None]
if out:
return joiner.join(out)
else:
return
else:
return varname + "=" + ",".join([_quote(x, safe) \
for x in value])
elif isinstance(value, dict):
keys = sorted(value.keys())
if explode:
return joiner.join([_quote(key, safe) + "=" + \
_quote(value[key], safe) \
for key in keys if key is not None])
else:
return varname + "=" + ",".join([_quote(key, safe) + "," + \
_quote(value[key], safe) for key in keys \
if key is not None])
else:
if value is None:
return
elif value:
return (varname + "=" + _quote(value, safe, prefix))
else:
return varname
def _tostring_query(varname, value, explode, prefix, operator, safe=""):
joiner = operator
if operator in ["?", "&"]:
joiner = "&"
if isinstance(value, list):
if 0 == len(value):
return None
if explode:
return joiner.join([varname + "=" + _quote(x, safe) \
for x in value])
else:
return (varname + "=" + ",".join([_quote(x, safe) \
for x in value]))
elif isinstance(value, dict):
if 0 == len(value):
return None
keys = sorted(value.keys())
if explode:
return joiner.join([_quote(key, safe) + "=" + \
_quote(value[key], safe) \
for key in keys])
else:
return varname + "=" + \
",".join([_quote(key, safe) + "," + \
_quote(value[key], safe) for key in keys])
else:
if value is None:
return
elif value:
return (varname + "=" + _quote(value, safe, prefix))
else:
return (varname + "=")
TOSTRING = {
"" : _tostring,
"+": _tostring,
"#": _tostring,
";": _tostring_semi,
"?": _tostring_query,
"&": _tostring_query,
"/": _tostring_path,
".": _tostring_path,
}
def expand(template, variables):
"""
Expand template as a URI Template using variables.
"""
def _sub(match):
expression = match.group(1)
operator = ""
if expression[0] in OPERATOR:
operator = expression[0]
varlist = expression[1:]
else:
varlist = expression
safe = ""
if operator in ["+", "#"]:
safe = RESERVED
varspecs = varlist.split(",")
varnames = []
defaults = {}
for varspec in varspecs:
default = None
explode = False
prefix = None
if "=" in varspec:
varname, default = tuple(varspec.split("=", 1))
else:
varname = varspec
if varname[-1] == "*":
explode = True
varname = varname[:-1]
elif ":" in varname:
try:
prefix = int(varname[varname.index(":")+1:])
except ValueError:
raise ValueError("non-integer prefix '{0}'".format(
varname[varname.index(":")+1:]))
varname = varname[:varname.index(":")]
if default:
defaults[varname] = default
varnames.append((varname, explode, prefix))
retval = []
joiner = operator
start = operator
if operator == "+":
start = ""
joiner = ","
if operator == "#":
joiner = ","
if operator == "?":
joiner = "&"
if operator == "&":
start = "&"
if operator == "":
joiner = ","
for varname, explode, prefix in varnames:
if varname in variables:
value = variables[varname]
if not value and value != "" and varname in defaults:
value = defaults[varname]
elif varname in defaults:
value = defaults[varname]
else:
continue
expanded = TOSTRING[operator](
varname, value, explode, prefix, operator, safe=safe)
if expanded is not None:
retval.append(expanded)
if len(retval) > 0:
return start + joiner.join(retval)
else:
return ""
return TEMPLATE.sub(_sub, template)
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