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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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
from qpid.lexer import Lexicon, LexError
from qpid.parser import Parser, ParseError
l = Lexicon()
LBRACE = l.define("LBRACE", r"\{")
RBRACE = l.define("RBRACE", r"\}")
LBRACK = l.define("LBRACK", r"\[")
RBRACK = l.define("RBRACK", r"\]")
COLON = l.define("COLON", r":")
SEMI = l.define("SEMI", r";")
SLASH = l.define("SLASH", r"/")
COMMA = l.define("COMMA", r",")
NUMBER = l.define("NUMBER", r'[+-]?[0-9]*\.?[0-9]+')
ID = l.define("ID", r'[a-zA-Z_](?:[a-zA-Z0-9_-]*[a-zA-Z0-9_])?')
STRING = l.define("STRING", r""""(?:[^\\"]|\\.)*"|'(?:[^\\']|\\.)*'""")
ESC = l.define("ESC", r"\\[^ux]|\\x[0-9a-fA-F][0-9a-fA-F]|\\u[0-9a-fA-F][0-9a-fA-F][0-9a-fA-F][0-9a-fA-F]")
SYM = l.define("SYM", r"[.#*%@$^!+-]")
WSPACE = l.define("WSPACE", r"[ \n\r\t]+")
EOF = l.eof("EOF")
LEXER = l.compile()
def lex(st):
return LEXER.lex(st)
def tok2str(tok):
if tok.type is STRING:
return eval(tok.value)
elif tok.type is ESC:
if tok.value[1] == "x":
return eval('"%s"' % tok.value)
elif tok.value[1] == "u":
return eval('u"%s"' % tok.value)
else:
return tok.value[1]
else:
return tok.value
CONSTANTS = {
"True": True,
"true": True,
"False": False,
"false": False,
"None": None
}
def tok2obj(tok):
if tok.type == ID:
return CONSTANTS.get(tok.value, tok.value)
elif tok.type in (STRING, NUMBER):
return eval(tok.value)
else:
return tok.value
def toks2str(toks):
if toks:
return "".join(map(tok2str, toks))
else:
return None
class AddressParser(Parser):
def __init__(self, tokens):
Parser.__init__(self, [t for t in tokens if t.type is not WSPACE])
def parse(self):
result = self.address()
self.eat(EOF)
return result
def address(self):
name = toks2str(self.eat_until(SLASH, SEMI, EOF))
if name is None:
raise ParseError(self.next())
if self.matches(SLASH):
self.eat(SLASH)
subject = toks2str(self.eat_until(SEMI, EOF))
else:
subject = None
if self.matches(SEMI):
self.eat(SEMI)
options = self.map()
else:
options = None
return name, subject, options
def map(self):
self.eat(LBRACE)
result = {}
while True:
if self.matches(NUMBER, STRING, ID, LBRACE, LBRACK):
n, v = self.keyval()
result[n] = v
if self.matches(COMMA):
self.eat(COMMA)
elif self.matches(RBRACE):
break
else:
raise ParseError(self.next(), COMMA, RBRACE)
elif self.matches(RBRACE):
break
else:
raise ParseError(self.next(), NUMBER, STRING, ID, LBRACE, LBRACK,
RBRACE)
self.eat(RBRACE)
return result
def keyval(self):
key = self.value()
self.eat(COLON)
val = self.value()
return (key, val)
def value(self):
if self.matches(NUMBER, STRING, ID):
return tok2obj(self.eat())
elif self.matches(LBRACE):
return self.map()
elif self.matches(LBRACK):
return self.list()
else:
raise ParseError(self.next(), NUMBER, STRING, ID, LBRACE, LBRACK)
def list(self):
self.eat(LBRACK)
result = []
while True:
if self.matches(RBRACK):
break
else:
result.append(self.value())
if self.matches(COMMA):
self.eat(COMMA)
elif self.matches(RBRACK):
break
else:
raise ParseError(self.next(), COMMA, RBRACK)
self.eat(RBRACK)
return result
def parse(addr):
return AddressParser(lex(addr)).parse()
__all__ = ["parse", "ParseError"]
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