objutils.py

wxPython的基本示例程序

#----------------------------------------------------------------------------
# Name:         objutils.py
# Purpose:      Object Utilities
#
# Author:       Alan Mullendore
#
# Created:      5/10/05
# CVS-ID:       $Id: objutils.py,v 1.5 2006/04/20 06:25:51 RD Exp $
# Copyright:    (c) 2004-2005 ActiveGrid, Inc.
# License:      wxWindows License
#----------------------------------------------------------------------------

import logging
import traceback
import sys
import os
import __builtin__
import types
import activegrid.util.utillang as utillang
import activegrid.util.datetimeparser as datetimeparser
from types import *
from activegrid.util.lang import *

FUNCTION_HAS_ATTR = '_hasAttr'
FUNCTION_GET_ATTR = '_getAttr'
FUNCTION_SET_ATTR = '_setAttr'
FUNCTION_DEL_ATTR = '_delAttr'

def hasRawAttr(obj, name):
    if obj == None:
        return False
    if name != FUNCTION_HAS_ATTR and hasattr(obj, FUNCTION_HAS_ATTR):
        return obj._hasAttr(name)
    return obj.__dict__.has_key(name)
    
def getRawAttr(obj, name):
    if name != FUNCTION_GET_ATTR and hasattr(obj, FUNCTION_GET_ATTR):
        return obj._getAttr(name)
    return obj.__dict__.get(name)
    
def setRawAttr(obj, name, value):
    if name != FUNCTION_SET_ATTR and hasattr(obj, FUNCTION_SET_ATTR):
        obj._setAttr(name, value)
    else:
        obj.__dict__[name] = value
    
def delRawAttr(obj, name):
    if name != FUNCTION_DEL_ATTR and hasattr(obj, FUNCTION_DEL_ATTR):
        obj._delAttr(name)
    else:
        del obj.__dict__[name]

def getStaticAttr(obj, attr):
    if (isinstance(obj, types.TypeType)):
        classDesc = obj
    else:
        classDesc = obj.__class__
    if (hasattr(classDesc, attr)):
        return getattr(classDesc, attr)
    return None
    
def setStaticAttr(obj, attr, value):
    if (isinstance(obj, types.TypeType)):
        classDesc = obj
    else:
        classDesc = obj.__class__
    setattr(classDesc, attr, value)

def hasAttrFast(obj, name):
    if hasRawAttr(obj, name):
        return True
    if hasattr(obj, '_complexType'):
        complexType=obj._complexType
        element=complexType.findElement(name)
        if element:
            return True
    if hasattr(obj, name):
        return True
    return False

def moduleForName(moduleName):
    module = None
    pathList = moduleName.split('.')
    if (len(moduleName) > 0):
        module = __import__(moduleName)
        for name in pathList[1:]:
            if (name in module.__dict__):
                module = module.__dict__[name]
            else:
                module = None
                break
    return module
    
def typeForName(typeName):
    i = typeName.rfind('.')
    if (i >= 0):
        module = moduleForName(typeName[:i])
        if (module != None):
            name = typeName[i+1:]
            if (name in module.__dict__):
                return module.__dict__[name]
    elif __builtin__.__dict__.has_key(typeName):
        return __builtin__.__dict__[typeName]
    return None
    
def functionForName(functionName):
    ftype = typeForName(functionName)
    if (isinstance(ftype, (types.FunctionType, types.MethodType, types.BuiltinFunctionType, types.BuiltinMethodType))):
        return ftype
    return None
    
def classForName(className):
    ctype = typeForName(className)
    if (isinstance(ctype, (types.ClassType, types.TypeType))):
        return ctype
    return None

def newInstance(className, objargs=None):
    "dynamically create an object based on the className and return it."

    if not isinstance(objargs, list):
        objargs = [objargs]

    if className == "None":
        return None
    elif className == "bool":
        if ((len(objargs) < 1) or (objargs[0].lower() == "false") or (not objargs[0])):
            return False
        return True
    if className == "str" or className == "unicode": # don't strip: blanks are significant
        if len(objargs) > 0:
            try:
                return utillang.unescape(objargs[0]).encode()
            except:
                return "?"
        else:
            return ""
            
    if className == "date":
        return datetimeparser.parse(objargs[0], asdate=True)
    if className == "datetime":
        return datetimeparser.parse(objargs[0])
    if className == "time":
        return datetimeparser.parse(objargs[0], astime=True)
        
    classtype = classForName(className)
    if (classtype == None):
        raise Exception("Could not find class %s" % className)
        
    if (len(objargs) > 0):
        return classtype(*objargs)
    else:
        return classtype()

def getClassProperty(classType, propertyName):
    return getattr(classType, propertyName)
    
def toDiffableRepr(value, maxLevel=None):
    if (value == None):
        return "None"
    if (maxLevel == None):
        maxLevel = 8
    maxLevel -= 1
    if (maxLevel < 0):
        return typeToString(value, PRINT_OBJ_DIFFABLE)
##    if ((exclude != None) and not isinstance(value, (basestring, int))):
##        for v in exclude:
##            if (v is value):
##                return "<recursive reference>"
##        exclude.append(value)
##    elif (isinstance(value, ObjectType) and hasattr(value, "__dict__")):
##        if (exclude == None):
##            exclude = []
##        s = "%s(%s)" % (type(value), toDiffableString(value.__dict__, exclude))
    if (not isinstance(value, (BooleanType, ClassType, ComplexType, DictType, DictionaryType, 
                               FloatType, IntType, ListType, LongType, StringType, TupleType, 
                               UnicodeType, BufferType, BuiltinFunctionType, BuiltinMethodType,
                               CodeType, FrameType, FunctionType, GeneratorType, InstanceType,
                               LambdaType, MethodType, ModuleType, SliceType, TracebackType,
                               TypeType, XRangeType))):
        if (hasattr(value, "_toDiffableString")):
            s = value._toDiffableString(maxLevel)
        elif (hasattr(value, "__str__")):
            s = str(value)
        elif (hasattr(value, "__dict__")):
            s = "%s(%s)" % (type(value), toDiffableString(value.__dict__, maxLevel))
        else:
            s = str(type(value))
        ix2 = s.find(" object at 0x")
        if (ix2 > 0):
            ix = s.rfind(".")
            if (ix > 0):
                s = "<class %s>" %s[ix+1:ix2]
    elif (isinstance(value, bool)):
        if (value):
            return "True"
        else:
            return "False"
    elif (isinstance(value, (tuple, list))):
        items = []
        for v in value:
            if (isinstance(v, basestring)):
                if (v.find("'") >= 0):
                    items.append('"%s"' % v)
                else:
                    items.append("'%s'" % v)
            else:
                items.append(toDiffableString(v, maxLevel))
        s = "[" + ", ".join(items) + "]"
    elif (isinstance(value, dict)):
        items = []
        for key, val in value.iteritems():
            if (isinstance(val, UnicodeType)):
                items.append("'%s': u'%s'" % (key, toDiffableString(val, maxLevel)))
            elif (isinstance(val, basestring)):
                items.append("'%s': '%s'" % (key, toDiffableString(val, maxLevel)))
            else:
                items.append("'%s': %s" % (key, toDiffableString(val, maxLevel)))
        s = "{" + ", ".join(items) + "}"
    else:
        s = str(value)
    return s