author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 15:13:56 +0530 | |
changeset 318 | 49ee2a7f1350 |
parent 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
307
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1 |
""" |
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2 |
module for generating and serializing xml and html structures |
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3 |
by using simple python objects. |
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|
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5 |
(c) holger krekel, holger at merlinux eu. 2009 |
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""" |
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import py |
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import sys, re |
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|
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if sys.version_info >= (3,0): |
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def u(s): |
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return s |
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def unicode(x): |
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if hasattr(x, '__unicode__'): |
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return x.__unicode__() |
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return str(x) |
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else: |
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def u(s): |
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return unicode(s) |
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unicode = unicode |
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|
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class NamespaceMetaclass(type): |
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def __getattr__(self, name): |
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if name[:1] == '_': |
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raise AttributeError(name) |
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if self == Namespace: |
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raise ValueError("Namespace class is abstract") |
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tagspec = self.__tagspec__ |
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if tagspec is not None and name not in tagspec: |
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raise AttributeError(name) |
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classattr = {} |
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if self.__stickyname__: |
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classattr['xmlname'] = name |
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cls = type(name, (self.__tagclass__,), classattr) |
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setattr(self, name, cls) |
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return cls |
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class Tag(list): |
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class Attr(object): |
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def __init__(self, **kwargs): |
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self.__dict__.update(kwargs) |
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def __init__(self, *args, **kwargs): |
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super(Tag, self).__init__(args) |
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self.attr = self.Attr(**kwargs) |
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def __unicode__(self): |
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return self.unicode(indent=0) |
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__str__ = __unicode__ |
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def unicode(self, indent=2): |
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l = [] |
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SimpleUnicodeVisitor(l.append, indent).visit(self) |
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return "".join(l) |
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def __repr__(self): |
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name = self.__class__.__name__ |
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return "<%r tag object %d>" % (name, id(self)) |
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Namespace = NamespaceMetaclass('Namespace', (object, ), { |
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'__tagspec__': None, |
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'__tagclass__': Tag, |
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'__stickyname__': False, |
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}) |
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class HtmlTag(Tag): |
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def unicode(self, indent=2): |
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l = [] |
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HtmlVisitor(l.append, indent, shortempty=False).visit(self) |
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return u("").join(l) |
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72 |
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# exported plain html namespace |
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class html(Namespace): |
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__tagclass__ = HtmlTag |
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__stickyname__ = True |
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__tagspec__ = dict([(x,1) for x in ( |
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'a,abbr,acronym,address,applet,area,b,bdo,big,blink,' |
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'blockquote,body,br,button,caption,center,cite,code,col,' |
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'colgroup,comment,dd,del,dfn,dir,div,dl,dt,em,embed,' |
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'fieldset,font,form,frameset,h1,h2,h3,h4,h5,h6,head,html,' |
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'i,iframe,img,input,ins,kbd,label,legend,li,link,listing,' |
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83 |
'map,marquee,menu,meta,multicol,nobr,noembed,noframes,' |
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84 |
'noscript,object,ol,optgroup,option,p,pre,q,s,script,' |
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85 |
'select,small,span,strike,strong,style,sub,sup,table,' |
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86 |
'tbody,td,textarea,tfoot,th,thead,title,tr,tt,u,ul,xmp,' |
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87 |
'base,basefont,frame,hr,isindex,param,samp,var' |
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88 |
).split(',') if x]) |
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89 |
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class Style(object): |
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91 |
def __init__(self, **kw): |
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92 |
for x, y in kw.items(): |
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93 |
x = x.replace('_', '-') |
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94 |
setattr(self, x, y) |
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95 |
|
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96 |
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97 |
class raw(object): |
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98 |
"""just a box that can contain a unicode string that will be |
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99 |
included directly in the output""" |
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100 |
def __init__(self, uniobj): |
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101 |
self.uniobj = uniobj |
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102 |
|
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103 |
class SimpleUnicodeVisitor(object): |
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104 |
""" recursive visitor to write unicode. """ |
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105 |
def __init__(self, write, indent=0, curindent=0, shortempty=True): |
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106 |
self.write = write |
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107 |
self.cache = {} |
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108 |
self.visited = {} # for detection of recursion |
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109 |
self.indent = indent |
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110 |
self.curindent = curindent |
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111 |
self.parents = [] |
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112 |
self.shortempty = shortempty # short empty tags or not |
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113 |
|
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114 |
def visit(self, node): |
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115 |
""" dispatcher on node's class/bases name. """ |
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116 |
cls = node.__class__ |
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117 |
try: |
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changeset
|
118 |
visitmethod = self.cache[cls] |
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|
119 |
except KeyError: |
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|
120 |
for subclass in cls.__mro__: |
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121 |
visitmethod = getattr(self, subclass.__name__, None) |
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|
122 |
if visitmethod is not None: |
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|
123 |
break |
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changeset
|
124 |
else: |
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|
125 |
visitmethod = self.object |
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|
126 |
self.cache[cls] = visitmethod |
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|
127 |
visitmethod(node) |
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changeset
|
128 |
|
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|
129 |
def object(self, obj): |
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130 |
#self.write(obj) |
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|
131 |
self.write(escape(unicode(obj))) |
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|
132 |
|
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|
133 |
def raw(self, obj): |
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|
134 |
self.write(obj.uniobj) |
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changeset
|
135 |
|
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|
136 |
def list(self, obj): |
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|
137 |
assert id(obj) not in self.visited |
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|
138 |
self.visited[id(obj)] = 1 |
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|
139 |
map(self.visit, obj) |
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|
140 |
|
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|
141 |
def Tag(self, tag): |
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|
142 |
assert id(tag) not in self.visited |
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|
143 |
try: |
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|
144 |
tag.parent = self.parents[-1] |
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|
145 |
except IndexError: |
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|
146 |
tag.parent = None |
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|
147 |
self.visited[id(tag)] = 1 |
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|
148 |
tagname = getattr(tag, 'xmlname', tag.__class__.__name__) |
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|
149 |
if self.curindent and not self._isinline(tagname): |
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|
150 |
self.write("\n" + u(' ') * self.curindent) |
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|
151 |
if tag: |
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|
152 |
self.curindent += self.indent |
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|
153 |
self.write(u('<%s%s>') % (tagname, self.attributes(tag))) |
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|
154 |
self.parents.append(tag) |
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changeset
|
155 |
for x in tag: |
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|
156 |
self.visit(x) |
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changeset
|
157 |
self.parents.pop() |
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changeset
|
158 |
self.write(u('</%s>') % tagname) |
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diff
changeset
|
159 |
self.curindent -= self.indent |
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diff
changeset
|
160 |
else: |
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changeset
|
161 |
nameattr = tagname+self.attributes(tag) |
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parents:
diff
changeset
|
162 |
if self._issingleton(tagname): |
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diff
changeset
|
163 |
self.write(u('<%s/>') % (nameattr,)) |
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diff
changeset
|
164 |
else: |
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changeset
|
165 |
self.write(u('<%s></%s>') % (nameattr, tagname)) |
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changeset
|
166 |
|
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changeset
|
167 |
def attributes(self, tag): |
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parents:
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|
168 |
# serialize attributes |
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|
169 |
attrlist = dir(tag.attr) |
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parents:
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changeset
|
170 |
attrlist.sort() |
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Nishanth Amuluru <nishanth@fossee.in>
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diff
changeset
|
171 |
l = [] |
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Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
172 |
for name in attrlist: |
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diff
changeset
|
173 |
res = self.repr_attribute(tag.attr, name) |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
174 |
if res is not None: |
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parents:
diff
changeset
|
175 |
l.append(res) |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
176 |
l.extend(self.getstyle(tag)) |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
177 |
return u("").join(l) |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
178 |
|
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Nishanth Amuluru <nishanth@fossee.in>
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diff
changeset
|
179 |
def repr_attribute(self, attrs, name): |
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diff
changeset
|
180 |
if name[:2] != '__': |
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Added buildout stuff and made changes accordingly
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diff
changeset
|
181 |
value = getattr(attrs, name) |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
182 |
if name.endswith('_'): |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
183 |
name = name[:-1] |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
184 |
return ' %s="%s"' % (name, escape(unicode(value))) |
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Added buildout stuff and made changes accordingly
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parents:
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changeset
|
185 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
186 |
def getstyle(self, tag): |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
187 |
""" return attribute list suitable for styling. """ |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
188 |
try: |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
189 |
styledict = tag.style.__dict__ |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
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diff
changeset
|
190 |
except AttributeError: |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
191 |
return [] |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
192 |
else: |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
193 |
stylelist = [x+': ' + y for x,y in styledict.items()] |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
194 |
return [u(' style="%s"') % u('; ').join(stylelist)] |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
195 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
196 |
def _issingleton(self, tagname): |
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parents:
diff
changeset
|
197 |
"""can (and will) be overridden in subclasses""" |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
198 |
return self.shortempty |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
199 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
200 |
def _isinline(self, tagname): |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
201 |
"""can (and will) be overridden in subclasses""" |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
202 |
return False |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
203 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
204 |
class HtmlVisitor(SimpleUnicodeVisitor): |
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Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
205 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
206 |
single = dict([(x, 1) for x in |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
207 |
('br,img,area,param,col,hr,meta,link,base,' |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
208 |
'input,frame').split(',')]) |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
209 |
inline = dict([(x, 1) for x in |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
210 |
('a abbr acronym b basefont bdo big br cite code dfn em font ' |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
211 |
'i img input kbd label q s samp select small span strike ' |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
212 |
'strong sub sup textarea tt u var'.split(' '))]) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
213 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
214 |
def repr_attribute(self, attrs, name): |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
215 |
if name == 'class_': |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
216 |
value = getattr(attrs, name) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
217 |
if value is None: |
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Added buildout stuff and made changes accordingly
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parents:
diff
changeset
|
218 |
return |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
219 |
return super(HtmlVisitor, self).repr_attribute(attrs, name) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
220 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
221 |
def _issingleton(self, tagname): |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
222 |
return tagname in self.single |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
223 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
224 |
def _isinline(self, tagname): |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
225 |
return tagname in self.inline |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
226 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
227 |
|
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
228 |
class _escape: |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
229 |
def __init__(self): |
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Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
230 |
self.escape = { |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
231 |
u('"') : u('"'), u('<') : u('<'), u('>') : u('>'), |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
232 |
u('&') : u('&'), u("'") : u('''), |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
233 |
} |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
234 |
self.charef_rex = re.compile(u("|").join(self.escape.keys())) |
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Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
235 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
236 |
def _replacer(self, match): |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
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changeset
|
237 |
return self.escape[match.group(0)] |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
238 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
239 |
def __call__(self, ustring): |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
240 |
""" xml-escape the given unicode string. """ |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
241 |
ustring = unicode(ustring) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
242 |
return self.charef_rex.sub(self._replacer, ustring) |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
243 |
|
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
|
244 |
escape = _escape() |