This file is indexed.

/usr/share/pyshared/werkzeug/templates.py is in python-werkzeug 0.8.1+dfsg-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
# -*- coding: utf-8 -*-
r"""
    werkzeug.templates
    ~~~~~~~~~~~~~~~~~~

    A minimal template engine.

    :copyright: (c) 2011 by the Werkzeug Team, see AUTHORS for more details.
    :license: BSD License.
"""
import sys
import re
import __builtin__ as builtins
from compiler import ast, parse
from compiler.pycodegen import ModuleCodeGenerator
from tokenize import PseudoToken
from werkzeug import urls, utils
from werkzeug._internal import _decode_unicode
from werkzeug.datastructures import MultiDict


from warnings import warn
warn(DeprecationWarning('werkzeug.templates is deprecated and '
                        'will be removed in Werkzeug 1.0'))


# Copyright notice: The `parse_data` method uses the string interpolation
# algorithm by Ka-Ping Yee which originally was part of `Itpl20.py`_.
#
# .. _Itpl20.py: http://lfw.org/python/Itpl20.py


token_re = re.compile('%s|%s(?s)' % (
    r'[uU]?[rR]?("""|\'\'\')((?<!\\)\\\1|.)*?\1',
    PseudoToken
))
directive_re = re.compile(r'(?<!\\)<%(?:(#)|(py(?:thon)?\b)|'
                          r'(?:\s*(\w+))\s*)(.*?)\s*%>\n?(?s)')
escape_re = re.compile(r'\\\n|\\(\\|<%)')
namestart_chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_'
undefined = type('UndefinedType', (object,), {
    '__iter__': lambda x: iter(()),
    '__repr__': lambda x: 'Undefined',
    '__str__':  lambda x: ''
})()
runtime_vars = frozenset(['Undefined', '__to_unicode', '__context',
                          '__write', '__write_many'])


def call_stmt(func, args, lineno):
    return ast.CallFunc(ast.Name(func, lineno=lineno),
                        args, lineno=lineno)


def tokenize(source, filename):
    escape = escape_re.sub
    escape_repl = lambda m: m.group(1) or ''
    lineno = 1
    pos = 0

    for match in directive_re.finditer(source):
        start, end = match.span()
        if start > pos:
            data = source[pos:start]
            yield lineno, 'data', escape(escape_repl, data)
            lineno += data.count('\n')
        is_comment, is_code, cmd, args = match.groups()
        if is_code:
            yield lineno, 'code', args
        elif not is_comment:
            yield lineno, 'cmd', (cmd, args)
        lineno += source[start:end].count('\n')
        pos = end

    if pos < len(source):
        yield lineno, 'data', escape(escape_repl, source[pos:])


def transform(node, filename):
    root = ast.Module(None, node, lineno=1)
    nodes = [root]
    while nodes:
        node = nodes.pop()
        node.filename = filename
        if node.__class__ in (ast.Printnl, ast.Print):
            node.dest = ast.Name('__context')
        elif node.__class__ is ast.Const and isinstance(node.value, str):
            try:
                node.value.decode('ascii')
            except UnicodeError:
                node.value = node.value.decode('utf-8')
        nodes.extend(node.getChildNodes())
    return root


class TemplateSyntaxError(SyntaxError):

    def __init__(self, msg, filename, lineno):
        from linecache import getline
        l = getline(filename, lineno)
        SyntaxError.__init__(self, msg, (filename, lineno, len(l) or 1, l))


class Parser(object):

    def __init__(self, gen, filename):
        self.gen = gen
        self.filename = filename
        self.lineno = 1

    def fail(self, msg):
        raise TemplateSyntaxError(msg, self.filename, self.lineno)

    def parse_python(self, expr, type='exec'):
        if isinstance(expr, unicode):
            expr = '\xef\xbb\xbf' + expr.encode('utf-8')
        try:
            node = parse(expr, type)
        except SyntaxError, e:
            raise TemplateSyntaxError(str(e), self.filename,
                                      self.lineno + e.lineno - 1)
        nodes = [node]
        while nodes:
            n = nodes.pop()
            if hasattr(n, 'lineno'):
                n.lineno = (n.lineno or 1) + self.lineno - 1
            nodes.extend(n.getChildNodes())
        return node.node

    def parse(self, needle=()):
        start_lineno = self.lineno
        result = []
        add = result.append
        for self.lineno, token, value in self.gen:
            if token == 'data':
                add(self.parse_data(value))
            elif token == 'code':
                add(self.parse_code(value.splitlines()))
            elif token == 'cmd':
                name, args = value
                if name in needle:
                    return name, args, ast.Stmt(result, lineno=start_lineno)
                if name in ('for', 'while'):
                    add(self.parse_loop(args, name))
                elif name == 'if':
                    add(self.parse_if(args))
                else:
                    self.fail('unknown directive %s' % name)
        if needle:
            self.fail('unexpected end of template')
        return ast.Stmt(result, lineno=start_lineno)

    def parse_loop(self, args, type):
        rv = self.parse_python('%s %s: pass' % (type, args), 'exec').nodes[0]
        tag, value, rv.body = self.parse(('end' + type, 'else'))
        if value:
            self.fail('unexpected data after ' + tag)
        if tag == 'else':
            tag, value, rv.else_ = self.parse(('end' + type,))
            if value:
                self.fail('unexpected data after else')
        return rv

    def parse_if(self, args):
        cond = self.parse_python('if %s: pass' % args).nodes[0]
        tag, value, body = self.parse(('else', 'elif', 'endif'))
        cond.tests[0] = (cond.tests[0][0], body)
        while 1:
            if tag == 'else':
                if value:
                    self.fail('unexpected data after else')
                tag, value, cond.else_ = self.parse(('endif',))
            elif tag == 'elif':
                expr = self.parse_python(value, 'eval')
                tag, value, body = self.parse(('else', 'elif', 'endif'))
                cond.tests.append((expr, body))
                continue
            break
        if value:
            self.fail('unexpected data after endif')
        return cond

    def parse_code(self, lines):
        margin = sys.maxint
        for line in lines[1:]:
            content = len(line.lstrip())
            if content:
                indent = len(line) - content
                margin = min(margin, indent)
        if lines:
            lines[0] = lines[0].lstrip()
        if margin < sys.maxint:
            for i in xrange(1, len(lines)):
                lines[i] = lines[i][margin:]
        while lines and not lines[-1]:
            lines.pop()
        while lines and not lines[0]:
            lines.pop(0)
        return self.parse_python('\n'.join(lines))

    def parse_data(self, text):
        start_lineno = lineno = self.lineno
        pos = 0
        end = len(text)
        nodes = []

        def match_or_fail(pos):
            match = token_re.match(text, pos)
            if match is None:
                self.fail('invalid syntax')
            return match.group().strip(), match.end()

        def write_expr(code):
            node = self.parse_python(code, 'eval')
            nodes.append(call_stmt('__to_unicode', [node], lineno))
            return code.count('\n')

        def write_data(value):
            if value:
                nodes.append(ast.Const(value, lineno=lineno))
                return value.count('\n')
            return 0

        while 1:
            offset = text.find('$', pos)
            if offset < 0:
                break
            next = text[offset + 1]

            if next == '{':
                lineno += write_data(text[pos:offset])
                pos = offset + 2
                level = 1
                while level:
                    token, pos = match_or_fail(pos)
                    if token in ('{', '}'):
                        level += token == '{' and 1 or -1
                lineno += write_expr(text[offset + 2:pos - 1])
            elif next in namestart_chars:
                lineno += write_data(text[pos:offset])
                token, pos = match_or_fail(offset + 1)
                while pos < end:
                    if text[pos] == '.' and pos + 1 < end and \
                       text[pos + 1] in namestart_chars:
                        token, pos = match_or_fail(pos + 1)
                    elif text[pos] in '([':
                        pos += 1
                        level = 1
                        while level:
                            token, pos = match_or_fail(pos)
                            if token in ('(', ')', '[', ']'):
                                level += token in '([' and 1 or -1
                    else:
                        break
                lineno += write_expr(text[offset + 1:pos])
            else:
                lineno += write_data(text[pos:offset + 1])
                pos = offset + 1 + (next == '$')
        write_data(text[pos:])

        return ast.Discard(call_stmt(len(nodes) == 1 and '__write' or
                           '__write_many', nodes, start_lineno),
                           lineno=start_lineno)


class Context(object):

    def __init__(self, namespace, charset, errors):
        self.charset = charset
        self.errors = errors
        self._namespace = namespace
        self._buffer = []
        self._write = self._buffer.append
        _extend = self._buffer.extend
        self.runtime = dict(
            Undefined=undefined,
            __to_unicode=self.to_unicode,
            __context=self,
            __write=self._write,
            __write_many=lambda *a: _extend(a)
        )

    def write(self, value):
        self._write(self.to_unicode(value))

    def to_unicode(self, value):
        if isinstance(value, str):
            return _decode_unicode(value, self.charset, self.errors)
        return unicode(value)

    def get_value(self, as_unicode=True):
        rv = u''.join(self._buffer)
        if not as_unicode:
            return rv.encode(self.charset, self.errors)
        return rv

    def __getitem__(self, key, default=undefined):
        try:
            return self._namespace[key]
        except KeyError:
            return getattr(builtins, key, default)

    def get(self, key, default=None):
        return self.__getitem__(key, default)

    def __setitem__(self, key, value):
        self._namespace[key] = value

    def __delitem__(self, key):
        del self._namespace[key]


class TemplateCodeGenerator(ModuleCodeGenerator):

    def __init__(self, node, filename):
        ModuleCodeGenerator.__init__(self, transform(node, filename))

    def _nameOp(self, prefix, name):
        if name in runtime_vars:
            return self.emit(prefix + '_GLOBAL', name)
        return ModuleCodeGenerator._nameOp(self, prefix, name)


class Template(object):
    """Represents a simple text based template.  It's a good idea to load such
    templates from files on the file system to get better debug output.
    """

    default_context = {
        'escape':           utils.escape,
        'url_quote':        urls.url_quote,
        'url_quote_plus':   urls.url_quote_plus,
        'url_encode':       urls.url_encode
    }

    def __init__(self, source, filename='<template>', charset='utf-8',
                 errors='strict', unicode_mode=True):
        if isinstance(source, str):
            source = _decode_unicode(source, charset, errors)
        if isinstance(filename, unicode):
            filename = filename.encode('utf-8')
        node = Parser(tokenize(u'\n'.join(source.splitlines()),
                               filename), filename).parse()
        self.code = TemplateCodeGenerator(node, filename).getCode()
        self.filename = filename
        self.charset = charset
        self.errors = errors
        self.unicode_mode = unicode_mode

    @classmethod
    def from_file(cls, file, charset='utf-8', errors='strict',
                  unicode_mode=True):
        """Load a template from a file.

        .. versionchanged:: 0.5
            The encoding parameter was renamed to charset.

        :param file: a filename or file object to load the template from.
        :param charset: the charset of the template to load.
        :param errors: the error behavior of the charset decoding.
        :param unicode_mode: set to `False` to disable unicode mode.
        :return: a template
        """
        close = False
        f = file
        if isinstance(file, basestring):
            f = open(file, 'r')
            close = True
        try:
            data = _decode_unicode(f.read(), charset, errors)
        finally:
            if close:
                f.close()
        return cls(data, getattr(f, 'name', '<template>'), charset,
                   errors, unicode_mode)

    def render(self, *args, **kwargs):
        """This function accepts either a dict or some keyword arguments which
        will then be the context the template is evaluated in.  The return
        value will be the rendered template.

        :param context: the function accepts the same arguments as the
                        :class:`dict` constructor.
        :return: the rendered template as string
        """
        ns = self.default_context.copy()
        if len(args) == 1 and isinstance(args[0], MultiDict):
            ns.update(args[0].to_dict(flat=True))
        else:
            ns.update(dict(*args))
        if kwargs:
            ns.update(kwargs)
        context = Context(ns, self.charset, self.errors)
        exec self.code in context.runtime, context
        return context.get_value(self.unicode_mode)

    def substitute(self, *args, **kwargs):
        """For API compatibility with `string.Template`."""
        return self.render(*args, **kwargs)