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Diffstat (limited to 'silpa/jsonrpc/json.py')
| -rw-r--r-- | silpa/jsonrpc/json.py | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/silpa/jsonrpc/json.py b/silpa/jsonrpc/json.py new file mode 100644 index 0000000..4f945b2 --- /dev/null +++ b/silpa/jsonrpc/json.py @@ -0,0 +1,230 @@ + +""" + Copyright (c) 2007 Jan-Klaas Kollhof + + This file is part of jsonrpc. + + jsonrpc is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + This software is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this software; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +""" + +from types import * +import re + +CharReplacements ={ + '\t': '\\t', + '\b': '\\b', + '\f': '\\f', + '\n': '\\n', + '\r': '\\r', + '\\': '\\\\', + '/': '\\/', + '"': '\\"'} + +EscapeCharToChar = { + 't': '\t', + 'b': '\b', + 'f': '\f', + 'n': '\n', + 'r': '\r', + '\\': '\\', + '/': '/', + '"' : '"'} + +StringEscapeRE= re.compile(r'[\x00-\x19\\"/\b\f\n\r\t]') +Digits = ['0', '1', '2','3','4','5','6','7','8','9'] + + +class JSONEncodeException(Exception): + def __init__(self, obj): + Exception.__init__(self) + self.obj = obj + + def __str__(self): + return "Object not encodeable: %s" % self.obj + + +class JSONDecodeException(Exception): + def __init__(self, message): + Exception.__init__(self) + self.message = message + + def __str__(self): + return self.message + + +def escapeChar(match): + c=match.group(0) + try: + replacement = CharReplacements[c] + return replacement + except KeyError: + d = ord(c) + if d < 32: + return '\\u%04x' % d + else: + return c + +def dumps(obj): + return unicode("".join([part for part in dumpParts (obj)])) + +def dumpParts (obj): + objType = type(obj) + if obj == None: + yield u'null' + elif objType is BooleanType: + if obj: + yield u'true' + else: + yield u'false' + elif objType is DictionaryType: + yield u'{' + isFirst=True + for (key, value) in obj.items(): + if isFirst: + isFirst=False + else: + yield u"," + yield u'"' + StringEscapeRE.sub(escapeChar, key) +u'":' + for part in dumpParts (value): + yield part + yield u'}' + elif objType in StringTypes: + yield u'"' + StringEscapeRE.sub(escapeChar, obj) +u'"' + + elif objType in [TupleType, ListType, GeneratorType]: + yield u'[' + isFirst=True + for item in obj: + if isFirst: + isFirst=False + else: + yield u"," + for part in dumpParts (item): + yield part + yield u']' + elif objType in [IntType, LongType, FloatType]: + yield unicode(obj) + else: + raise JSONEncodeException(obj) + + +def loads(s): + stack = [] + chars = iter(s) + value = None + currCharIsNext=False + + try: + while(1): + skip = False + if not currCharIsNext: + c = chars.next() + while(c in [' ', '\t', '\r','\n']): + c = chars.next() + currCharIsNext=False + if c=='"': + value = '' + try: + c=chars.next() + while c != '"': + if c == '\\': + c=chars.next() + try: + value+=EscapeCharToChar[c] + except KeyError: + if c == 'u': + hexCode = chars.next() + chars.next() + chars.next() + chars.next() + value += unichr(int(hexCode,16)) + else: + raise JSONDecodeException("Bad Escape Sequence Found") + else: + value+=c + c=chars.next() + except StopIteration: + raise JSONDecodeException("Expected end of String") + elif c == '{': + stack.append({}) + skip=True + elif c =='}': + value = stack.pop() + elif c == '[': + stack.append([]) + skip=True + elif c == ']': + value = stack.pop() + elif c in [',',':']: + skip=True + elif c in Digits or c == '-': + digits=[c] + c = chars.next() + numConv = int + try: + while c in Digits: + digits.append(c) + c = chars.next() + if c == ".": + numConv=float + digits.append(c) + c = chars.next() + while c in Digits: + digits.append(c) + c = chars.next() + if c.upper() == 'E': + digits.append(c) + c = chars.next() + if c in ['+','-']: + digits.append(c) + c = chars.next() + while c in Digits: + digits.append(c) + c = chars.next() + else: + raise JSONDecodeException("Expected + or -") + except StopIteration: + pass + value = numConv("".join(digits)) + currCharIsNext=True + + elif c in ['t','f','n']: + kw = c+ chars.next() + chars.next() + chars.next() + if kw == 'null': + value = None + elif kw == 'true': + value = True + elif kw == 'fals' and chars.next() == 'e': + value = False + else: + raise JSONDecodeException('Expected Null, False or True') + else: + raise JSONDecodeException('Expected []{}," or Number, Null, False or True') + + if not skip: + if len(stack): + top = stack[-1] + if type(top) is ListType: + top.append(value) + elif type(top) is DictionaryType: + stack.append(value) + elif type(top) in StringTypes: + key = stack.pop() + stack[-1][key] = value + else: + raise JSONDecodeException("Expected dictionary key, or start of a value") + else: + return value + except StopIteration: + raise JSONDecodeException("Unexpected end of JSON source") + + |