1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Common definitions used by TAL and METAL compilation and transformation.
"""
import re
from zope.interface import implementer
from zope.tal.interfaces import ITALExpressionErrorInfo
#: Version of the specification we implement.
TAL_VERSION = "1.6"
#: URI for XML namespace
XML_NS = "http://www.w3.org/XML/1998/namespace"
#: URI for XML NS declarations
XMLNS_NS = "http://www.w3.org/2000/xmlns/"
#: TAL namespace URI
ZOPE_TAL_NS = "http://xml.zope.org/namespaces/tal"
#: METAL namespace URI
ZOPE_METAL_NS = "http://xml.zope.org/namespaces/metal"
#: I18N namespace URI
ZOPE_I18N_NS = "http://xml.zope.org/namespaces/i18n"
# This RE must exactly match the expression of the same name in the
# zope.i18n.simpletranslationservice module:
NAME_RE = "[a-zA-Z_][-a-zA-Z0-9_]*"
#: Known METAL attributes
KNOWN_METAL_ATTRIBUTES = frozenset([
"define-macro",
"extend-macro",
"use-macro",
"define-slot",
"fill-slot",
])
#: Known TAL attributes
KNOWN_TAL_ATTRIBUTES = frozenset([
"define",
"condition",
"content",
"replace",
"repeat",
"attributes",
"on-error",
"omit-tag",
"script",
"tal tag", # a pseudo attribute that holds the namespace of elements
# like <tal:x>, <metal:y>, <i18n:z>
])
#: Known I18N attributes
KNOWN_I18N_ATTRIBUTES = frozenset([
"translate",
"domain",
"target",
"source",
"attributes",
"data",
"name",
"ignore",
"ignore-attributes",
])
class TALError(Exception):
"""
A base exception for errors raised by this implementation.
"""
def __init__(self, msg, position=(None, None)):
Exception.__init__(self)
assert msg != ""
self.msg = msg
self.lineno = position[0]
self.offset = position[1]
self.filename = None
def setFile(self, filename):
self.filename = filename
def __str__(self):
result = self.msg
if self.lineno is not None:
result = result + ", at line %d" % self.lineno
if self.offset is not None:
result = result + ", column %d" % (self.offset + 1)
if self.filename is not None:
result = result + ', in file %s' % self.filename
return result
class METALError(TALError):
"""An error parsing on running METAL macros."""
class TALExpressionError(TALError):
"""An error parsing or running a TAL expression."""
class I18NError(TALError):
"""An error parsing a I18N expression."""
@implementer(ITALExpressionErrorInfo)
class ErrorInfo:
"""
Default implementation of
:class:`zope.tal.interfaces.ITALExpressionErrorInfo`.
"""
def __init__(self, err, position=(None, None)):
if isinstance(err, Exception):
self.type = err.__class__
self.value = err
else:
self.type = err
self.value = None
self.lineno = position[0]
self.offset = position[1]
_attr_re = re.compile(r"\s*([^\s]+)\s+([^\s].*)\Z", re.S)
_subst_re = re.compile(r"\s*(?:(text|structure)\s+)?(.*)\Z", re.S)
def parseAttributeReplacements(arg, xml):
attr_dict = {}
for part in splitParts(arg):
m = _attr_re.match(part)
if not m:
raise TALError("Bad syntax in attributes: %r" % part)
name, expr = m.groups()
if not xml:
name = name.lower()
if name in attr_dict:
raise TALError("Duplicate attribute name in attributes: %r" % part)
attr_dict[name] = expr
return attr_dict
def parseSubstitution(arg, position=(None, None)):
m = _subst_re.match(arg)
if not m:
raise TALError("Bad syntax in substitution text: %r" % arg, position)
key, expr = m.groups()
if not key:
key = "text"
return key, expr
def splitParts(arg):
# Break in pieces at undoubled semicolons and
# change double semicolons to singles:
arg = arg.replace(";;", "\0")
parts = arg.split(';')
parts = [p.replace("\0", ";") for p in parts]
if len(parts) > 1 and not parts[-1].strip():
del parts[-1] # It ended in a semicolon
return parts
def isCurrentVersion(program):
version = getProgramVersion(program)
return version == TAL_VERSION
def isinstance_(ob, kind):
# Proxy-friendly and faster isinstance_ check for new-style objects
try:
return kind in ob.__class__.__mro__
except AttributeError:
return False
def getProgramMode(program):
version = getProgramVersion(program)
if (version == TAL_VERSION and isinstance_(program[1], tuple)
and len(program[1]) == 2):
opcode, mode = program[1]
if opcode == "mode":
return mode
return None
def getProgramVersion(program):
if (len(program) >= 2
and isinstance_(program[0], tuple) and len(program[0]) == 2):
opcode, version = program[0]
if opcode == "version":
return version
return None
_ent1_re = re.compile('&(?![A-Z#])', re.I)
_entch_re = re.compile('&([A-Z][A-Z0-9]*)(?![A-Z0-9;])', re.I)
_entn1_re = re.compile('&#(?![0-9X])', re.I)
_entnx_re = re.compile('&(#X[A-F0-9]*)(?![A-F0-9;])', re.I)
_entnd_re = re.compile('&(#[0-9][0-9]*)(?![0-9;])')
def attrEscape(s):
"""Replace special characters '&<>' by character entities,
except when '&' already begins a syntactically valid entity."""
s = _ent1_re.sub('&', s)
s = _entch_re.sub(r'&\1', s)
s = _entn1_re.sub('&#', s)
s = _entnx_re.sub(r'&\1', s)
s = _entnd_re.sub(r'&\1', s)
s = s.replace('<', '<')
s = s.replace('>', '>')
s = s.replace('"', '"')
return s
def quote(s):
s = s.replace("&", "&") # Must be done first!
s = s.replace("<", "<")
s = s.replace(">", ">")
s = s.replace('"', """)
return '"%s"' % s
|
