Tempita support

Cython/Compiler/Code.py

@@ -12,6 +12,7 @@ import os
 import re
 import codecs
 
+import glob
 import Naming
 import Options
 import StringEncoding
@@ -20,6 +21,7 @@ from Scanning import SourceDescriptor
 from Cython.StringIOTree import StringIOTree
 import DebugFlags
 import Errors
+from Cython import Tempita as tempita
 
 from Cython.Utils import none_or_sub
 try:
@@ -42,6 +44,9 @@ uncachable_builtins = [
     'WindowsError',
     ]
 
+Cython_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+Utility_dir = os.path.join(Cython_dir, "Utility")
+
 class UtilityCodeBase(object):
 
     is_cython_utility = False
@@ -69,8 +74,7 @@ class UtilityCodeBase(object):
         if utilities:
             return utilities
 
-        Cython_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-        filename = os.path.join(Cython_dir, "Utility", path)
+        filename = os.path.join(Utility_dir, path)
         f = codecs.open(filename, encoding='UTF-8')
 
         _, ext = os.path.splitext(path)
@@ -111,8 +115,8 @@ class UtilityCodeBase(object):
         return utilities
 
     @classmethod
-    def load_utility_from_file(cls, path, util_code_name, proto_fmt_dict=None,
-                               impl_fmt_dict=None, *args, **kwargs):
+    def load_utility_from_file(cls, path, util_code_name,
+                               context=None, **kwargs):
         """
         Load a utility code from a file specified by path (relative to
         Cython/Utility) and name util_code_name.
@@ -125,37 +129,52 @@ class UtilityCodeBase(object):
         for prototypes and implementation respectively. For non-python or
         -cython files a // comment should be used instead.
 
-        proto_fmt_dict and impl_format_dict can optionally be given to perform
-        any substitutions.
+        If context is given, the utility is considered a tempita template.
+        The context dict (which may be empty) will be unpacked to form
+        all the variables in the template.
 
         If the @cname decorator is not used and this is a CythonUtilityCode,
         one should pass in the 'name' keyword argument to be used for name
         mangling of such entries.
         """
-        proto, impl = cls.load_utility_as_string(path, util_code_name)
+        proto, impl = cls.load_utility_as_string(path, util_code_name, context)
 
-        if proto:
-            if proto_fmt_dict:
-                proto = proto % proto_fmt_dict
+        if proto is not None:
             kwargs['proto'] = proto
-
-        if impl:
-            if impl_fmt_dict:
-                impl = impl % impl_fmt_dict
+        if impl is not None:
             kwargs['impl'] = impl
 
         if 'name' not in kwargs:
             kwargs['name'] = os.path.splitext(path)[0]
 
-        return cls(*args, **kwargs)
+        return cls(**kwargs)
 
     @classmethod
-    def load_utility_as_string(cls, path, util_code_name):
+    def load_utility_as_string(cls, path, util_code_name, context=None):
         """
         Load a utility code as a string. Returns (proto, implementation)
         """
         utilities = cls.load_utilities_from_file(path)
-        return utilities[util_code_name]
+
+        proto, impl = utilities[util_code_name]
+        if proto:
+            if context is not None:
+                proto = tempita.sub(proto, **context)
+
+        if impl:
+            if context is not None:
+                impl = tempita.sub(impl, **context)
+
+        return proto, impl
+
+    @classmethod
+    def load_utility(cls, name, context=None, **kwargs):
+        "Load utility name with context from a utility file name.suffix"
+        files = glob.glob(os.path.join(Utility_dir, name + '.*'))
+        if len(files) != 1:
+            raise ValueError("Need exactly one utility file")
+
+        return cls.load_utilities_from_file(files[0], name, context, **kwargs)
 
     def __str__(self):
         return "<%s(%s)" % (type(self).__name__, self.name)
@@ -1275,6 +1294,12 @@ class CCodeWriter(object):
         elif fix_indent:
             self.level += 1
 
+    def putln_tempita(self, code, **context):
+        self.putln(tempita.sub(code, **context))
+
+    def put_tempita(self, code, **context):
+        self.put(tempita.sub(code, **context))
+
     def increase_indent(self):
         self.level = self.level + 1
 

Cython/Compiler/ExprNodes.py

@@ -2345,8 +2345,12 @@ class IndexNode(ExprNode):
 
         skip_child_analysis = False
         buffer_access = False
-#        memoryviewslice_access = False
-        if self.base.type.is_buffer or self.base.type.is_memoryviewslice:
+        memoryviewslice_access = False
+
+        if (self.base.type.is_memoryviewslice and not self.indices and
+                isinstance(self.index, EllipsisNode)):
+            memoryviewslice_access = True
+        elif self.base.type.is_buffer or self.base.type.is_memoryviewslice:
             if self.indices:
                 indices = self.indices
             else:
@@ -2390,11 +2394,11 @@ class IndexNode(ExprNode):
                     if self.type.is_buffer:
                         self.base.entry.buffer_aux.writable_needed = True
 
-#        elif memoryviewslice_access:
-#            self.type = self.base.type
-#            self.is_memoryviewslice_access = True
-#            if getting:
-#                error(self.pos, "memoryviews currently support setting only.")
+        elif memoryviewslice_access:
+            self.type = self.base.type
+            self.is_memoryviewslice_access = True
+            if getting:
+                error(self.pos, "memoryviews currently support setting only.")
 
         else:
             base_type = self.base.type

Cython/Compiler/MemoryView.py

@@ -112,7 +112,7 @@ def put_assign_to_memviewslice(lhs_cname, rhs_cname, memviewslicetype, pos, code
     for i in range(ndim):
         code.putln("%s.shape[%d] = %s.shape[%d];" % (lhs_cname, i, rhs_cname, i))
         code.putln("%s.strides[%d] = %s.strides[%d];" % (lhs_cname, i, rhs_cname, i))
-        # code.putln("%s.suboffsets[%d] = %s.suboffsets[%d];" % (lhs_cname, i, rhs_cname, i))
+        code.putln("%s.suboffsets[%d] = %s.suboffsets[%d];" % (lhs_cname, i, rhs_cname, i))
 
 def get_buf_flag(specs):
     is_c_contig, is_f_contig = is_cf_contig(specs)
@@ -186,7 +186,7 @@ class MemoryViewSliceBufferEntry(Buffer.BufferEntry):
         self.buf_ptr_type = dtype
 
     def get_buf_suboffsetvars(self):
-        return self._for_all_ndim("%s.memview->view.suboffsets[%d]")
+        return self._for_all_ndim("%s.suboffsets[%d]")
 
     def get_buf_stridevars(self):
         return self._for_all_ndim("%s.strides[%d]")
@@ -267,7 +267,7 @@ static int %s(const __Pyx_memviewslice mvs) {
     %(for_loop)s {
 
 #ifdef DEBUG
-        /* printf("mvs.suboffsets[i] %%d\\n", mvs.suboffsets[i]); */
+        printf("mvs.suboffsets[i] %%d\\n", mvs.suboffsets[i]);
         printf("mvs.strides[i] %%d\\n", mvs.strides[i]);
         printf("mvs.shape[i] %%d\\n", mvs.shape[i]);
         printf("size %%d\\n", size);
@@ -275,7 +275,7 @@ static int %s(const __Pyx_memviewslice mvs) {
 #endif
 #undef DEBUG
 
-        if(mvs.memview->view.suboffsets[i] >= 0) {
+        if(mvs.suboffsets[i] >= 0) {
             return 0;
         }
         if(size * itemsize != mvs.strides[i]) {
@@ -374,13 +374,17 @@ class CopyFuncUtilCode(object):
             mode = 'fortran'
             contig_flag = "PyBUF_F_CONTIGUOUS"
 
-        code.put(copy_template %
-            dict(
-                 copy_name=self.copy_func_name,
-                 mode=mode,
-                 sizeof_dtype="sizeof(%s)" % self.from_memview.dtype.declaration_code(''),
-                 contig_flag=contig_flag,
-                 copy_contents_name=copy_contents_name))
+        context = dict(
+            copy_name=self.copy_func_name,
+            mode=mode,
+            sizeof_dtype="sizeof(%s)" % self.from_memview.dtype.declaration_code(''),
+            contig_flag=contig_flag,
+            copy_contents_name=copy_contents_name
+        )
+
+        _, copy_code = UtilityCode.load_utility_as_string(
+                    "MemoryView_C.c", "MemviewSliceCopyTemplate", context)
+        code.put(copy_code)
 
 
 def get_copy_contents_func(from_mvs, to_mvs, cfunc_name):
@@ -744,10 +748,8 @@ def load_memview_c_utility(name, *args, **kwargs):
 def load_memview_c_string(name):
     return UtilityCode.load_utility_as_string("MemoryView_C.c", name)
 
-_, copy_template = UtilityCode.load_utility_as_string(
-                "MemoryView_C.c", "MemviewSliceCopyTemplate")
 
-fmt_dict = {
+context = {
     'memview_struct_name': memview_objstruct_cname,
     'max_dims': Options.buffer_max_dims,
     'memviewslice_name': memviewslice_cname,
@@ -755,10 +757,10 @@ fmt_dict = {
 memviewslice_declare_code = load_memview_c_utility(
         name="MemviewSliceStruct",
         proto_block='utility_code_proto_before_types',
-        proto_fmt_dict=fmt_dict)
+        context=context)
 
 memviewslice_init_code = load_memview_c_utility(
     name="MemviewSliceInit",
-    proto_fmt_dict={'BUF_MAX_NDIMS': Options.buffer_max_dims},
+    context={'BUF_MAX_NDIMS': Options.buffer_max_dims},
     requires=[memviewslice_declare_code],
 )

Cython/Tempita/__init__.py

+"""
+A small templating language
+
+This implements a small templating language.  This language implements
+if/elif/else, for/continue/break, expressions, and blocks of Python
+code.  The syntax is::
+
+  {{any expression (function calls etc)}}
+  {{any expression | filter}}
+  {{for x in y}}...{{endfor}}
+  {{if x}}x{{elif y}}y{{else}}z{{endif}}
+  {{py:x=1}}
+  {{py:
+  def foo(bar):
+      return 'baz'
+  }}
+  {{default var = default_value}}
+  {{# comment}}
+
+You use this with the ``Template`` class or the ``sub`` shortcut.
+The ``Template`` class takes the template string and the name of
+the template (for errors) and a default namespace.  Then (like
+``string.Template``) you can call the ``tmpl.substitute(**kw)``
+method to make a substitution (or ``tmpl.substitute(a_dict)``).
+
+``sub(content, **kw)`` substitutes the template immediately.  You
+can use ``__name='tmpl.html'`` to set the name of the template.
+
+If there are syntax errors ``TemplateError`` will be raised.
+"""
+
+import re
+import sys
+import cgi
+from urllib import quote as url_quote
+import os
+import tokenize
+from cStringIO import StringIO
+from Cython.Tempita._looper import looper
+from Cython.Tempita.compat3 import bytes, basestring_, next, is_unicode, coerce_text
+
+__all__ = ['TemplateError', 'Template', 'sub', 'HTMLTemplate',
+           'sub_html', 'html', 'bunch']
+
+in_re = re.compile(r'\s+in\s+')
+var_re = re.compile(r'^[a-z_][a-z0-9_]*$', re.I)
+
+
+class TemplateError(Exception):
+    """Exception raised while parsing a template
+    """
+
+    def __init__(self, message, position, name=None):
+        Exception.__init__(self, message)
+        self.position = position
+        self.name = name
+
+    def __str__(self):
+        msg = ' '.join(self.args)
+        if self.position:
+            msg = '%s at line %s column %s' % (
+                msg, self.position[0], self.position[1])
+        if self.name:
+            msg += ' in %s' % self.name
+        return msg
+
+
+class _TemplateContinue(Exception):
+    pass
+
+
+class _TemplateBreak(Exception):
+    pass
+
+
+def get_file_template(name, from_template):
+    path = os.path.join(os.path.dirname(from_template.name), name)
+    return from_template.__class__.from_filename(
+        path, namespace=from_template.namespace,
+        get_template=from_template.get_template)
+
+
+class Template(object):
+
+    default_namespace = {
+        'start_braces': '{{',
+        'end_braces': '}}',
+        'looper': looper,
+        }
+
+    default_encoding = 'utf8'
+    default_inherit = None
+
+    def __init__(self, content, name=None, namespace=None, stacklevel=None,
+                 get_template=None, default_inherit=None, line_offset=0,
+                 delimeters=None):
+        self.content = content
+
+        # set delimeters
+        if delimeters is None:
+            delimeters = (self.default_namespace['start_braces'],
+                          self.default_namespace['end_braces'])
+        else:
+            assert len(delimeters) == 2 and all([isinstance(delimeter, basestring)
+                                                 for delimeter in delimeters])
+            self.default_namespace = self.__class__.default_namespace.copy()
+            self.default_namespace['start_braces'] = delimeters[0]
+            self.default_namespace['end_braces'] = delimeters[1]
+        self.delimeters = delimeters
+        
+        self._unicode = is_unicode(content)
+        if name is None and stacklevel is not None:
+            try:
+                caller = sys._getframe(stacklevel)
+            except ValueError:
+                pass
+            else:
+                globals = caller.f_globals
+                lineno = caller.f_lineno
+                if '__file__' in globals:
+                    name = globals['__file__']
+                    if name.endswith('.pyc') or name.endswith('.pyo'):
+                        name = name[:-1]
+                elif '__name__' in globals:
+                    name = globals['__name__']
+                else:
+                    name = '<string>'
+                if lineno:
+                    name += ':%s' % lineno
+        self.name = name
+        self._parsed = parse(content, name=name, line_offset=line_offset, delimeters=self.delimeters)
+        if namespace is None:
+            namespace = {}
+        self.namespace = namespace
+        self.get_template = get_template
+        if default_inherit is not None:
+            self.default_inherit = default_inherit
+
+    def from_filename(cls, filename, namespace=None, encoding=None,
+                      default_inherit=None, get_template=get_file_template):
+        f = open(filename, 'rb')
+        c = f.read()
+        f.close()
+        if encoding:
+            c = c.decode(encoding)
+        return cls(content=c, name=filename, namespace=namespace,
+                   default_inherit=default_inherit, get_template=get_template)
+
+    from_filename = classmethod(from_filename)
+
+    def __repr__(self):
+        return '<%s %s name=%r>' % (
+            self.__class__.__name__,
+            hex(id(self))[2:], self.name)
+
+    def substitute(self, *args, **kw):
+        if args:
+            if kw:
+                raise TypeError(
+                    "You can only give positional *or* keyword arguments")
+            if len(args) > 1:
+                raise TypeError(
+                    "You can only give one positional argument")
+            if not hasattr(args[0], 'items'):
+                raise TypeError(
+                    "If you pass in a single argument, you must pass in a dictionary-like object (with a .items() method); you gave %r"
+                    % (args[0],))
+            kw = args[0]
+        ns = kw
+        ns['__template_name__'] = self.name
+        if self.namespace:
+            ns.update(self.namespace)
+        result, defs, inherit = self._interpret(ns)
+        if not inherit:
+            inherit = self.default_inherit
+        if inherit:
+            result = self._interpret_inherit(result, defs, inherit, ns)
+        return result
+
+    def _interpret(self, ns):
+        __traceback_hide__ = True
+        parts = []
+        defs = {}
+        self._interpret_codes(self._parsed, ns, out=parts, defs=defs)
+        if '__inherit__' in defs:
+            inherit = defs.pop('__inherit__')
+        else:
+            inherit = None
+        return ''.join(parts), defs, inherit
+
+    def _interpret_inherit(self, body, defs, inherit_template, ns):
+        __traceback_hide__ = True
+        if not self.get_template:
+            raise TemplateError(
+                'You cannot use inheritance without passing in get_template',
+                position=None, name=self.name)
+        templ = self.get_template(inherit_template, self)
+        self_ = TemplateObject(self.name)
+        for name, value in defs.iteritems():
+            setattr(self_, name, value)
+        self_.body = body
+        ns = ns.copy()
+        ns['self'] = self_
+        return templ.substitute(ns)
+
+    def _interpret_codes(self, codes, ns, out, defs):
+        __traceback_hide__ = True
+        for item in codes:
+            if isinstance(item, basestring_):
+                out.append(item)
+            else:
+                self._interpret_code(item, ns, out, defs)
+
+    def _interpret_code(self, code, ns, out, defs):
+        __traceback_hide__ = True
+        name, pos = code[0], code[1]
+        if name == 'py':
+            self._exec(code[2], ns, pos)
+        elif name == 'continue':
+            raise _TemplateContinue()
+        elif name == 'break':
+            raise _TemplateBreak()
+        elif name == 'for':
+            vars, expr, content = code[2], code[3], code[4]
+            expr = self._eval(expr, ns, pos)
+            self._interpret_for(vars, expr, content, ns, out, defs)
+        elif name == 'cond':
+            parts = code[2:]
+            self._interpret_if(parts, ns, out, defs)
+        elif name == 'expr':
+            parts = code[2].split('|')
+            base = self._eval(parts[0], ns, pos)
+            for part in parts[1:]:
+                func = self._eval(part, ns, pos)
+                base = func(base)
+            out.append(self._repr(base, pos))
+        elif name == 'default':
+            var, expr = code[2], code[3]
+            if var not in ns:
+                result = self._eval(expr, ns, pos)
+                ns[var] = result
+        elif name == 'inherit':
+            expr = code[2]
+            value = self._eval(expr, ns, pos)
+            defs['__inherit__'] = value
+        elif name == 'def':
+            name = code[2]
+            signature = code[3]
+            parts = code[4]
+            ns[name] = defs[name] = TemplateDef(self, name, signature, body=parts, ns=ns,
+                                                pos=pos)
+        elif name == 'comment':
+            return
+        else:
+            assert 0, "Unknown code: %r" % name
+
+    def _interpret_for(self, vars, expr, content, ns, out, defs):
+        __traceback_hide__ = True
+        for item in expr:
+            if len(vars) == 1:
+                ns[vars[0]] = item
+            else:
+                if len(vars) != len(item):
+                    raise ValueError(
+                        'Need %i items to unpack (got %i items)'
+                        % (len(vars), len(item)))
+                for name, value in zip(vars, item):
+                    ns[name] = value
+            try:
+                self._interpret_codes(content, ns, out, defs)
+            except _TemplateContinue:
+                continue
+            except _TemplateBreak:
+                break
+
+    def _interpret_if(self, parts, ns, out, defs):
+        __traceback_hide__ = True
+        # @@: if/else/else gets through
+        for part in parts:
+            assert not isinstance(part, basestring_)
+            name, pos = part[0], part[1]
+            if name == 'else':
+                result = True
+            else:
+                result = self._eval(part[2], ns, pos)
+            if result:
+                self._interpret_codes(part[3], ns, out, defs)
+                break
+
+    def _eval(self, code, ns, pos):
+        __traceback_hide__ = True
+        try:
+            try:
+                value = eval(code, self.default_namespace, ns)
+            except SyntaxError, e:
+                raise SyntaxError(
+                    'invalid syntax in expression: %s' % code)
+            return value
+        except:
+            exc_info = sys.exc_info()
+            e = exc_info[1]
+            if getattr(e, 'args', None):
+                arg0 = e.args[0]
+            else:
+                arg0 = coerce_text(e)
+            e.args = (self._add_line_info(arg0, pos),)
+            raise exc_info[0], e, exc_info[2]
+
+    def _exec(self, code, ns, pos):
+        __traceback_hide__ = True
+        try:
+            exec code in self.default_namespace, ns
+        except:
+            exc_info = sys.exc_info()
+            e = exc_info[1]
+            if e.args:
+                e.args = (self._add_line_info(e.args[0], pos),)
+            else:
+                e.args = (self._add_line_info(None, pos),)
+            raise exc_info[0], e, exc_info[2]
+
+    def _repr(self, value, pos):
+        __traceback_hide__ = True
+        try:
+            if value is None:
+                return ''
+            if self._unicode:
+                try:
+                    value = unicode(value)
+                except UnicodeDecodeError:
+                    value = bytes(value)
+            else:
+                if not isinstance(value, basestring_):
+                    value = coerce_text(value)
+                if (is_unicode(value)
+                    and self.default_encoding):
+                    value = value.encode(self.default_encoding)
+        except:
+            exc_info = sys.exc_info()
+            e = exc_info[1]
+            e.args = (self._add_line_info(e.args[0], pos),)
+            raise exc_info[0], e, exc_info[2]
+        else:
+            if self._unicode and isinstance(value, bytes):
+                if not self.default_encoding:
+                    raise UnicodeDecodeError(
+                        'Cannot decode bytes value %r into unicode '
+                        '(no default_encoding provided)' % value)
+                try:
+                    value = value.decode(self.default_encoding)
+                except UnicodeDecodeError, e:
+                    raise UnicodeDecodeError(
+                        e.encoding,
+                        e.object,
+                        e.start,
+                        e.end,
+                        e.reason + ' in string %r' % value)
+            elif not self._unicode and is_unicode(value):
+                if not self.default_encoding:
+                    raise UnicodeEncodeError(
+                        'Cannot encode unicode value %r into bytes '
+                        '(no default_encoding provided)' % value)
+                value = value.encode(self.default_encoding)
+            return value
+
+    def _add_line_info(self, msg, pos):
+        msg = "%s at line %s column %s" % (
+            msg, pos[0], pos[1])
+        if self.name:
+            msg += " in file %s" % self.name
+        return msg
+
+
+def sub(content, delimeters=None, **kw):
+    name = kw.get('__name')
+    tmpl = Template(content, name=name, delimeters=delimeters)
+    return tmpl.substitute(kw)
+
+
+def paste_script_template_renderer(content, vars, filename=None):
+    tmpl = Template(content, name=filename)
+    return tmpl.substitute(vars)
+
+
+class bunch(dict):
+
+    def __init__(self, **kw):
+        for name, value in kw.iteritems():
+            setattr(self, name, value)
+
+    def __setattr__(self, name, value):
+        self[name] = value
+
+    def __getattr__(self, name):
+        try:
+            return self[name]
+        except KeyError:
+            raise AttributeError(name)
+
+    def __getitem__(self, key):
+        if 'default' in self:
+            try:
+                return dict.__getitem__(self, key)
+            except KeyError:
+                return dict.__getitem__(self, 'default')
+        else:
+            return dict.__getitem__(self, key)
+
+    def __repr__(self):
+        items = [
+            (k, v) for k, v in self.iteritems()]
+        items.sort()
+        return '<%s %s>' % (
+            self.__class__.__name__,
+            ' '.join(['%s=%r' % (k, v) for k, v in items]))
+
+############################################################
+## HTML Templating
+############################################################
+
+
+class html(object):
+
+    def __init__(self, value):
+        self.value = value
+
+    def __str__(self):
+        return self.value
+
+    def __html__(self):
+        return self.value
+
+    def __repr__(self):
+        return '<%s %r>' % (
+            self.__class__.__name__, self.value)
+
+
+def html_quote(value, force=True):
+    if not force and hasattr(value, '__html__'):
+        return value.__html__()
+    if value is None:
+        return ''
+    if not isinstance(value, basestring_):
+        value = coerce_text(value)
+    if sys.version >= "3" and isinstance(value, bytes):
+        value = cgi.escape(value.decode('latin1'), 1)
+        value = value.encode('latin1')
+    else:
+        value = cgi.escape(value, 1)
+    if sys.version < "3":
+        if is_unicode(value):
+            value = value.encode('ascii', 'xmlcharrefreplace')
+    return value
+
+
+def url(v):
+    v = coerce_text(v)
+    if is_unicode(v):
+        v = v.encode('utf8')
+    return url_quote(v)
+
+
+def attr(**kw):
+    kw = list(kw.iteritems())
+    kw.sort()
+    parts = []
+    for name, value in kw:
+        if value is None:
+            continue
+        if name.endswith('_'):
+            name = name[:-1]
+        parts.append('%s="%s"' % (html_quote(name), html_quote(value)))
+    return html(' '.join(parts))
+
+
+class HTMLTemplate(Template):
+
+    default_namespace = Template.default_namespace.copy()
+    default_namespace.update(dict(
+        html=html,
+        attr=attr,
+        url=url,
+        html_quote=html_quote,
+        ))
+
+    def _repr(self, value, pos):
+        if hasattr(value, '__html__'):
+            value = value.__html__()
+            quote = False
+        else:
+            quote = True
+        plain = Template._repr(self, value, pos)
+        if quote:
+            return html_quote(plain)
+        else:
+            return plain
+
+
+def sub_html(content, **kw):
+    name = kw.get('__name')
+    tmpl = HTMLTemplate(content, name=name)
+    return tmpl.substitute(kw)
+
+
+class TemplateDef(object):
+    def __init__(self, template, func_name, func_signature,
+                 body, ns, pos, bound_self=None):
+        self._template = template
+        self._func_name = func_name
+        self._func_signature = func_signature
+        self._body = body
+        self._ns = ns
+        self._pos = pos
+        self._bound_self = bound_self
+
+    def __repr__(self):
+        return '<tempita function %s(%s) at %s:%s>' % (
+            self._func_name, self._func_signature,
+            self._template.name, self._pos)
+
+    def __str__(self):
+        return self()
+
+    def __call__(self, *args, **kw):
+        values = self._parse_signature(args, kw)
+        ns = self._ns.copy()
+        ns.update(values)
+        if self._bound_self is not None:
+            ns['self'] = self._bound_self
+        out = []
+        subdefs = {}
+        self._template._interpret_codes(self._body, ns, out, subdefs)
+        return ''.join(out)
+
+    def __get__(self, obj, type=None):
+        if obj is None:
+            return self
+        return self.__class__(
+            self._template, self._func_name, self._func_signature,
+            self._body, self._ns, self._pos, bound_self=obj)
+
+    def _parse_signature(self, args, kw):
+        values = {}
+        sig_args, var_args, var_kw, defaults = self._func_signature
+        extra_kw = {}
+        for name, value in kw.iteritems():
+            if not var_kw and name not in sig_args:
+                raise TypeError(
+                    'Unexpected argument %s' % name)
+            if name in sig_args:
+                values[sig_args] = value
+            else:
+                extra_kw[name] = value
+        args = list(args)
+        sig_args = list(sig_args)
+        while args:
+            while sig_args and sig_args[0] in values:
+                sig_args.pop(0)
+            if sig_args:
+                name = sig_args.pop(0)
+                values[name] = args.pop(0)
+            elif var_args:
+                values[var_args] = tuple(args)
+                break
+            else:
+                raise TypeError(
+                    'Extra position arguments: %s'
+                    % ', '.join(repr(v) for v in args))
+        for name, value_expr in defaults.iteritems():
+            if name not in values:
+                values[name] = self._template._eval(
+                    value_expr, self._ns, self._pos)
+        for name in sig_args:
+            if name not in values:
+                raise TypeError(
+                    'Missing argument: %s' % name)
+        if var_kw:
+            values[var_kw] = extra_kw
+        return values
+
+
+class TemplateObject(object):
+
+    def __init__(self, name):
+        self.__name = name
+        self.get = TemplateObjectGetter(self)
+
+    def __repr__(self):
+        return '<%s %s>' % (self.__class__.__name__, self.__name)
+
+
+class TemplateObjectGetter(object):
+
+    def __init__(self, template_obj):
+        self.__template_obj = template_obj
+
+    def __getattr__(self, attr):
+        return getattr(self.__template_obj, attr, Empty)
+
+    def __repr__(self):
+        return '<%s around %r>' % (self.__class__.__name__, self.__template_obj)
+
+
+class _Empty(object):
+    def __call__(self, *args, **kw):
+        return self
+
+    def __str__(self):
+        return ''
+
+    def __repr__(self):
+        return 'Empty'
+
+    def __unicode__(self):
+        return u''
+
+    def __iter__(self):
+        return iter(())
+
+    def __bool__(self):
+        return False
+
+    if sys.version < "3":
+        __nonzero__ = __bool__
+
+Empty = _Empty()
+del _Empty
+
+############################################################
+## Lexing and Parsing
+############################################################
+
+
+def lex(s, name=None, trim_whitespace=True, line_offset=0, delimeters=None):
+    """
+    Lex a string into chunks:
+
+        >>> lex('hey')
+        ['hey']
+        >>> lex('hey {{you}}')
+        ['hey ', ('you', (1, 7))]
+        >>> lex('hey {{')
+        Traceback (most recent call last):
+            ...
+        TemplateError: No }} to finish last expression at line 1 column 7
+        >>> lex('hey }}')
+        Traceback (most recent call last):
+            ...
+        TemplateError: }} outside expression at line 1 column 7
+        >>> lex('hey {{ {{')
+        Traceback (most recent call last):
+            ...
+        TemplateError: {{ inside expression at line 1 column 10
+
+    """
+    if delimeters is None:
+        delimeters = ( Template.default_namespace['start_braces'],
+                       Template.default_namespace['end_braces'] )
+    in_expr = False
+    chunks = []
+    last = 0
+    last_pos = (1, 1)
+    token_re = re.compile(r'%s|%s' % (re.escape(delimeters[0]),
+                                      re.escape(delimeters[1])))
+    for match in token_re.finditer(s):
+        expr = match.group(0)
+        pos = find_position(s, match.end(), line_offset)
+        if expr == delimeters[0] and in_expr:
+            raise TemplateError('%s inside expression' % delimeters[0],
+                                position=pos,
+                                name=name)
+        elif expr == delimeters[1] and not in_expr:
+            raise TemplateError('%s outside expression' % delimeters[1],
+                                position=pos,
+                                name=name)
+        if expr == delimeters[0]:
+            part = s[last:match.start()]
+            if part:
+                chunks.append(part)
+            in_expr = True
+        else:
+            chunks.append((s[last:match.start()], last_pos))
+            in_expr = False
+        last = match.end()
+        last_pos = pos
+    if in_expr:
+        raise TemplateError('No %s to finish last expression' % delimeters[1],
+                            name=name, position=last_pos)
+    part = s[last:]
+    if part:
+        chunks.append(part)
+    if trim_whitespace:
+        chunks = trim_lex(chunks)
+    return chunks
+
+statement_re = re.compile(r'^(?:if |elif |for |def |inherit |default |py:)')
+single_statements = ['else', 'endif', 'endfor', 'enddef', 'continue', 'break']
+trail_whitespace_re = re.compile(r'\n\r?[\t ]*$')
+lead_whitespace_re = re.compile(r'^[\t ]*\n')
+
+
+def trim_lex(tokens):
+    r"""
+    Takes a lexed set of tokens, and removes whitespace when there is
+    a directive on a line by itself:
+
+       >>> tokens = lex('{{if x}}\nx\n{{endif}}\ny', trim_whitespace=False)
+       >>> tokens
+       [('if x', (1, 3)), '\nx\n', ('endif', (3, 3)), '\ny']
+       >>> trim_lex(tokens)
+       [('if x', (1, 3)), 'x\n', ('endif', (3, 3)), 'y']
+    """
+    last_trim = None
+    for i in range(len(tokens)):
+        current = tokens[i]
+        if isinstance(tokens[i], basestring_):
+            # we don't trim this
+            continue
+        item = current[0]
+        if not statement_re.search(item) and item not in single_statements:
+            continue
+        if not i:
+            prev = ''
+        else:
+            prev = tokens[i - 1]
+        if i + 1 >= len(tokens):
+            next_chunk = ''
+        else:
+            next_chunk = tokens[i + 1]
+        if (not isinstance(next_chunk, basestring_)
+            or not isinstance(prev, basestring_)):
+            continue
+        prev_ok = not prev or trail_whitespace_re.search(prev)
+        if i == 1 and not prev.strip():
+            prev_ok = True
+        if last_trim is not None and last_trim + 2 == i and not prev.strip():
+            prev_ok = 'last'
+        if (prev_ok
+            and (not next_chunk or lead_whitespace_re.search(next_chunk)
+                 or (i == len(tokens) - 2 and not next_chunk.strip()))):
+            if prev:
+                if ((i == 1 and not prev.strip())
+                    or prev_ok == 'last'):
+                    tokens[i - 1] = ''
+                else:
+                    m = trail_whitespace_re.search(prev)
+                    # +1 to leave the leading \n on:
+                    prev = prev[:m.start() + 1]
+                    tokens[i - 1] = prev
+            if next_chunk:
+                last_trim = i
+                if i == len(tokens) - 2 and not next_chunk.strip():
+                    tokens[i + 1] = ''
+                else:
+                    m = lead_whitespace_re.search(next_chunk)
+                    next_chunk = next_chunk[m.end():]
+                    tokens[i + 1] = next_chunk
+    return tokens
+
+
+def find_position(string, index, line_offset):
+    """Given a string and index, return (line, column)"""
+    leading = string[:index].splitlines()
+    return (len(leading) + line_offset, len(leading[-1]) + 1)
+
+
+def parse(s, name=None, line_offset=0, delimeters=None):
+    r"""
+    Parses a string into a kind of AST
+
+        >>> parse('{{x}}')
+        [('expr', (1, 3), 'x')]
+        >>> parse('foo')
+        ['foo']
+        >>> parse('{{if x}}test{{endif}}')
+        [('cond', (1, 3), ('if', (1, 3), 'x', ['test']))]
+        >>> parse('series->{{for x in y}}x={{x}}{{endfor}}')
+        ['series->', ('for', (1, 11), ('x',), 'y', ['x=', ('expr', (1, 27), 'x')])]
+        >>> parse('{{for x, y in z:}}{{continue}}{{endfor}}')
+        [('for', (1, 3), ('x', 'y'), 'z', [('continue', (1, 21))])]
+        >>> parse('{{py:x=1}}')
+        [('py', (1, 3), 'x=1')]
+        >>> parse('{{if x}}a{{elif y}}b{{else}}c{{endif}}')
+        [('cond', (1, 3), ('if', (1, 3), 'x', ['a']), ('elif', (1, 12), 'y', ['b']), ('else', (1, 23), None, ['c']))]
+
+    Some exceptions::
+
+        >>> parse('{{continue}}')
+        Traceback (most recent call last):
+            ...
+        TemplateError: continue outside of for loop at line 1 column 3
+        >>> parse('{{if x}}foo')
+        Traceback (most recent call last):
+            ...
+        TemplateError: No {{endif}} at line 1 column 3
+        >>> parse('{{else}}')
+        Traceback (most recent call last):
+            ...
+        TemplateError: else outside of an if block at line 1 column 3
+        >>> parse('{{if x}}{{for x in y}}{{endif}}{{endfor}}')
+        Traceback (most recent call last):
+            ...
+        TemplateError: Unexpected endif at line 1 column 25
+        >>> parse('{{if}}{{endif}}')
+        Traceback (most recent call last):
+            ...
+        TemplateError: if with no expression at line 1 column 3
+        >>> parse('{{for x y}}{{endfor}}')
+        Traceback (most recent call last):
+            ...
+        TemplateError: Bad for (no "in") in 'x y' at line 1 column 3
+        >>> parse('{{py:x=1\ny=2}}')
+        Traceback (most recent call last):
+            ...
+        TemplateError: Multi-line py blocks must start with a newline at line 1 column 3
+    """
+    if delimeters is None:
+        delimeters = ( Template.default_namespace['start_braces'],
+                       Template.default_namespace['end_braces'] )
+    tokens = lex(s, name=name, line_offset=line_offset, delimeters=delimeters)
+    result = []
+    while tokens:
+        next_chunk, tokens = parse_expr(tokens, name)
+        result.append(next_chunk)
+    return result
+
+
+def parse_expr(tokens, name, context=()):
+    if isinstance(tokens[0], basestring_):
+        return tokens[0], tokens[1:]
+    expr, pos = tokens[0]
+    expr = expr.strip()
+    if expr.startswith('py:'):
+        expr = expr[3:].lstrip(' \t')
+        if expr.startswith('\n') or expr.startswith('\r'):
+            expr = expr.lstrip('\r\n')
+            if '\r' in expr:
+                expr = expr.replace('\r\n', '\n')
+                expr = expr.replace('\r', '')
+            expr += '\n'
+        else:
+            if '\n' in expr:
+                raise TemplateError(
+                    'Multi-line py blocks must start with a newline',
+                    position=pos, name=name)
+        return ('py', pos, expr), tokens[1:]
+    elif expr in ('continue', 'break'):
+        if 'for' not in context:
+            raise TemplateError(
+                'continue outside of for loop',
+                position=pos, name=name)
+        return (expr, pos), tokens[1:]
+    elif expr.startswith('if '):
+        return parse_cond(tokens, name, context)
+    elif (expr.startswith('elif ')
+          or expr == 'else'):
+        raise TemplateError(
+            '%s outside of an if block' % expr.split()[0],
+            position=pos, name=name)
+    elif expr in ('if', 'elif', 'for'):
+        raise TemplateError(
+            '%s with no expression' % expr,
+            position=pos, name=name)
+    elif expr in ('endif', 'endfor', 'enddef'):
+        raise TemplateError(
+            'Unexpected %s' % expr,
+            position=pos, name=name)
+    elif expr.startswith('for '):
+        return parse_for(tokens, name, context)
+    elif expr.startswith('default '):
+        return parse_default(tokens, name, context)
+    elif expr.startswith('inherit '):
+        return parse_inherit(tokens, name, context)
+    elif expr.startswith('def '):
+        return parse_def(tokens, name, context)
+    elif expr.startswith('#'):
+        return ('comment', pos, tokens[0][0]), tokens[1:]
+    return ('expr', pos, tokens[0][0]), tokens[1:]
+
+
+def parse_cond(tokens, name, context):
+    start = tokens[0][1]
+    pieces = []
+    context = context + ('if',)
+    while 1:
+        if not tokens:
+            raise TemplateError(
+                'Missing {{endif}}',
+                position=start, name=name)
+        if (isinstance(tokens[0], tuple)
+            and tokens[0][0] == 'endif'):
+            return ('cond', start) + tuple(pieces), tokens[1:]
+        next_chunk, tokens = parse_one_cond(tokens, name, context)
+        pieces.append(next_chunk)
+
+
+def parse_one_cond(tokens, name, context):
+    (first, pos), tokens = tokens[0], tokens[1:]
+    content = []
+    if first.endswith(':'):
+        first = first[:-1]
+    if first.startswith('if '):
+        part = ('if', pos, first[3:].lstrip(), content)
+    elif first.startswith('elif '):
+        part = ('elif', pos, first[5:].lstrip(), content)
+    elif first == 'else':
+        part = ('else', pos, None, content)
+    else:
+        assert 0, "Unexpected token %r at %s" % (first, pos)
+    while 1:
+        if not tokens:
+            raise TemplateError(
+                'No {{endif}}',
+                position=pos, name=name)
+        if (isinstance(tokens[0], tuple)
+            and (tokens[0][0] == 'endif'
+                 or tokens[0][0].startswith('elif ')
+                 or tokens[0][0] == 'else')):
+            return part, tokens
+        next_chunk, tokens = parse_expr(tokens, name, context)
+        content.append(next_chunk)
+
+
+def parse_for(tokens, name, context):
+    first, pos = tokens[0]
+    tokens = tokens[1:]
+    context = ('for',) + context
+    content = []
+    assert first.startswith('for ')
+    if first.endswith(':'):
+        first = first[:-1]
+    first = first[3:].strip()
+    match = in_re.search(first)
+    if not match:
+        raise TemplateError(
+            'Bad for (no "in") in %r' % first,
+            position=pos, name=name)
+    vars = first[:match.start()]
+    if '(' in vars:
+        raise TemplateError(
+            'You cannot have () in the variable section of a for loop (%r)'
+            % vars, position=pos, name=name)
+    vars = tuple([
+        v.strip() for v in first[:match.start()].split(',')
+        if v.strip()])
+    expr = first[match.end():]
+    while 1:
+        if not tokens:
+            raise TemplateError(
+                'No {{endfor}}',
+                position=pos, name=name)
+        if (isinstance(tokens[0], tuple)
+            and tokens[0][0] == 'endfor'):
+            return ('for', pos, vars, expr, content), tokens[1:]
+        next_chunk, tokens = parse_expr(tokens, name, context)
+        content.append(next_chunk)
+
+
+def parse_default(tokens, name, context):
+    first, pos = tokens[0]
+    assert first.startswith('default ')
+    first = first.split(None, 1)[1]
+    parts = first.split('=', 1)
+    if len(parts) == 1:
+        raise TemplateError(
+            "Expression must be {{default var=value}}; no = found in %r" % first,
+            position=pos, name=name)
+    var = parts[0].strip()
+    if ',' in var:
+        raise TemplateError(
+            "{{default x, y = ...}} is not supported",
+            position=pos, name=name)
+    if not var_re.search(var):
+        raise TemplateError(
+            "Not a valid variable name for {{default}}: %r"
+            % var, position=pos, name=name)
+    expr = parts[1].strip()
+    return ('default', pos, var, expr), tokens[1:]
+
+
+def parse_inherit(tokens, name, context):
+    first, pos = tokens[0]
+    assert first.startswith('inherit ')
+    expr = first.split(None, 1)[1]
+    return ('inherit', pos, expr), tokens[1:]
+
+
+def parse_def(tokens, name, context):
+    first, start = tokens[0]
+    tokens = tokens[1:]
+    assert first.startswith('def ')
+    first = first.split(None, 1)[1]
+    if first.endswith(':'):
+        first = first[:-1]
+    if '(' not in first:
+        func_name = first
+        sig = ((), None, None, {})
+    elif not first.endswith(')'):
+        raise TemplateError("Function definition doesn't end with ): %s" % first,
+                            position=start, name=name)
+    else:
+        first = first[:-1]
+        func_name, sig_text = first.split('(', 1)
+        sig = parse_signature(sig_text, name, start)
+    context = context + ('def',)
+    content = []
+    while 1:
+        if not tokens:
+            raise TemplateError(
+                'Missing {{enddef}}',
+                position=start, name=name)
+        if (isinstance(tokens[0], tuple)
+            and tokens[0][0] == 'enddef'):
+            return ('def', start, func_name, sig, content), tokens[1:]
+        next_chunk, tokens = parse_expr(tokens, name, context)
+        content.append(next_chunk)
+
+
+def parse_signature(sig_text, name, pos):
+    tokens = tokenize.generate_tokens(StringIO(sig_text).readline)
+    sig_args = []
+    var_arg = None
+    var_kw = None
+    defaults = {}
+
+    def get_token(pos=False):
+        try:
+            tok_type, tok_string, (srow, scol), (erow, ecol), line = next(tokens)
+        except StopIteration:
+            return tokenize.ENDMARKER, ''
+        if pos:
+            return tok_type, tok_string, (srow, scol), (erow, ecol)
+        else:
+            return tok_type, tok_string
+    while 1:
+        var_arg_type = None
+        tok_type, tok_string = get_token()
+        if tok_type == tokenize.ENDMARKER:
+            break
+        if tok_type == tokenize.OP and (tok_string == '*' or tok_string == '**'):
+            var_arg_type = tok_string
+            tok_type, tok_string = get_token()
+        if tok_type != tokenize.NAME:
+            raise TemplateError('Invalid signature: (%s)' % sig_text,
+                                position=pos, name=name)
+        var_name = tok_string
+        tok_type, tok_string = get_token()
+        if tok_type == tokenize.ENDMARKER or (tok_type == tokenize.OP and tok_string == ','):
+            if var_arg_type == '*':
+                var_arg = var_name
+            elif var_arg_type == '**':
+                var_kw = var_name
+            else:
+                sig_args.append(var_name)
+            if tok_type == tokenize.ENDMARKER:
+                break
+            continue
+        if var_arg_type is not None:
+            raise TemplateError('Invalid signature: (%s)' % sig_text,
+                                position=pos, name=name)
+        if tok_type == tokenize.OP and tok_string == '=':
+            nest_type = None
+            unnest_type = None
+            nest_count = 0
+            start_pos = end_pos = None
+            parts = []
+            while 1:
+                tok_type, tok_string, s, e = get_token(True)
+                if start_pos is None:
+                    start_pos = s
+                end_pos = e
+                if tok_type == tokenize.ENDMARKER and nest_count:
+                    raise TemplateError('Invalid signature: (%s)' % sig_text,
+                                        position=pos, name=name)
+                if (not nest_count and
+                    (tok_type == tokenize.ENDMARKER or (tok_type == tokenize.OP and tok_string == ','))):
+                    default_expr = isolate_expression(sig_text, start_pos, end_pos)
+                    defaults[var_name] = default_expr
+                    sig_args.append(var_name)
+                    break
+                parts.append((tok_type, tok_string))
+                if nest_count and tok_type == tokenize.OP and tok_string == nest_type:
+                    nest_count += 1
+                elif nest_count and tok_type == tokenize.OP and tok_string == unnest_type:
+                    nest_count -= 1
+                    if not nest_count:
+                        nest_type = unnest_type = None
+                elif not nest_count and tok_type == tokenize.OP and tok_string in ('(', '[', '{'):
+                    nest_type = tok_string
+                    nest_count = 1
+                    unnest_type = {'(': ')', '[': ']', '{': '}'}[nest_type]
+    return sig_args, var_arg, var_kw, defaults
+
+
+def isolate_expression(string, start_pos, end_pos):
+    srow, scol = start_pos
+    srow -= 1
+    erow, ecol = end_pos
+    erow -= 1
+    lines = string.splitlines(True)
+    if srow == erow:
+        return lines[srow][scol:ecol]
+    parts = [lines[srow][scol:]]
+    parts.extend(lines[srow+1:erow])
+    if erow < len(lines):
+        # It'll sometimes give (end_row_past_finish, 0)
+        parts.append(lines[erow][:ecol])
+    return ''.join(parts)
+
+_fill_command_usage = """\
+%prog [OPTIONS] TEMPLATE arg=value
+
+Use py:arg=value to set a Python value; otherwise all values are
+strings.
+"""
+
+
+def fill_command(args=None):
+    import sys
+    import optparse
+    import pkg_resources
+    import os
+    if args is None:
+        args = sys.argv[1:]
+    dist = pkg_resources.get_distribution('Paste')
+    parser = optparse.OptionParser(
+        version=coerce_text(dist),
+        usage=_fill_command_usage)
+    parser.add_option(
+        '-o', '--output',
+        dest='output',
+        metavar="FILENAME",
+        help="File to write output to (default stdout)")
+    parser.add_option(
+        '--html',
+        dest='use_html',
+        action='store_true',
+        help="Use HTML style filling (including automatic HTML quoting)")
+    parser.add_option(
+        '--env',
+        dest='use_env',
+        action='store_true',
+        help="Put the environment in as top-level variables")
+    options, args = parser.parse_args(args)
+    if len(args) < 1:
+        print('You must give a template filename')
+        sys.exit(2)
+    template_name = args[0]
+    args = args[1:]
+    vars = {}
+    if options.use_env:
+        vars.update(os.environ)
+    for value in args:
+        if '=' not in value:
+            print('Bad argument: %r' % value)
+            sys.exit(2)
+        name, value = value.split('=', 1)
+        if name.startswith('py:'):
+            name = name[:3]
+            value = eval(value)
+        vars[name] = value
+    if template_name == '-':
+        template_content = sys.stdin.read()
+        template_name = '<stdin>'
+    else:
+        f = open(template_name, 'rb')
+        template_content = f.read()
+        f.close()
+    if options.use_html:
+        TemplateClass = HTMLTemplate
+    else:
+        TemplateClass = Template
+    template = TemplateClass(template_content, name=template_name)
+    result = template.substitute(vars)
+    if options.output:
+        f = open(options.output, 'wb')
+        f.write(result)
+        f.close()
+    else:
+        sys.stdout.write(result)
+
+if __name__ == '__main__':
+    fill_command()

Cython/Tempita/_looper.py

+"""
+Helper for looping over sequences, particular in templates.
+
+Often in a loop in a template it's handy to know what's next up,
+previously up, if this is the first or last item in the sequence, etc.
+These can be awkward to manage in a normal Python loop, but using the
+looper you can get a better sense of the context.  Use like::
+
+    >>> for loop, item in looper(['a', 'b', 'c']):
+    ...     print loop.number, item
+    ...     if not loop.last:
+    ...         print '---'
+    1 a
+    ---
+    2 b
+    ---
+    3 c
+
+"""
+
+import sys
+from Cython.Tempita.compat3 import basestring_
+
+__all__ = ['looper']
+
+
+class looper(object):
+    """
+    Helper for looping (particularly in templates)
+
+    Use this like::
+
+        for loop, item in looper(seq):
+            if loop.first:
+                ...
+    """
+
+    def __init__(self, seq):
+        self.seq = seq
+
+    def __iter__(self):
+        return looper_iter(self.seq)
+
+    def __repr__(self):
+        return '<%s for %r>' % (
+            self.__class__.__name__, self.seq)
+
+
+class looper_iter(object):
+
+    def __init__(self, seq):
+        self.seq = list(seq)
+        self.pos = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.pos >= len(self.seq):
+            raise StopIteration
+        result = loop_pos(self.seq, self.pos), self.seq[self.pos]
+        self.pos += 1
+        return result
+
+    if sys.version < "3":
+        next = __next__
+
+
+class loop_pos(object):
+
+    def __init__(self, seq, pos):
+        self.seq = seq
+        self.pos = pos
+
+    def __repr__(self):
+        return '<loop pos=%r at %r>' % (
+            self.seq[self.pos], self.pos)
+
+    def index(self):
+        return self.pos
+    index = property(index)
+
+    def number(self):
+        return self.pos + 1
+    number = property(number)
+
+    def item(self):
+        return self.seq[self.pos]
+    item = property(item)
+
+    def __next__(self):
+        try:
+            return self.seq[self.pos + 1]
+        except IndexError:
+            return None
+    __next__ = property(__next__)
+
+    if sys.version < "3":
+        next = __next__
+
+    def previous(self):
+        if self.pos == 0:
+            return None
+        return self.seq[self.pos - 1]
+    previous = property(previous)
+
+    def odd(self):
+        return not self.pos % 2
+    odd = property(odd)
+
+    def even(self):
+        return self.pos % 2
+    even = property(even)
+
+    def first(self):
+        return self.pos == 0
+    first = property(first)
+
+    def last(self):
+        return self.pos == len(self.seq) - 1
+    last = property(last)
+
+    def length(self):
+        return len(self.seq)
+    length = property(length)
+
+    def first_group(self, getter=None):
+        """
+        Returns true if this item is the start of a new group,
+        where groups mean that some attribute has changed.  The getter
+        can be None (the item itself changes), an attribute name like
+        ``'.attr'``, a function, or a dict key or list index.
+        """
+        if self.first:
+            return True
+        return self._compare_group(self.item, self.previous, getter)
+
+    def last_group(self, getter=None):
+        """
+        Returns true if this item is the end of a new group,
+        where groups mean that some attribute has changed.  The getter
+        can be None (the item itself changes), an attribute name like
+        ``'.attr'``, a function, or a dict key or list index.
+        """
+        if self.last:
+            return True
+        return self._compare_group(self.item, self.__next__, getter)
+
+    def _compare_group(self, item, other, getter):
+        if getter is None:
+            return item != other
+        elif (isinstance(getter, basestring_)
+              and getter.startswith('.')):
+            getter = getter[1:]
+            if getter.endswith('()'):
+                getter = getter[:-2]
+                return getattr(item, getter)() != getattr(other, getter)()
+            else:
+                return getattr(item, getter) != getattr(other, getter)
+        elif hasattr(getter, '__call__'):
+            return getter(item) != getter(other)
+        else:
+            return item[getter] != other[getter]

Cython/Tempita/compat3.py

+import sys
+
+__all__ = ['b', 'basestring_', 'bytes', 'next', 'is_unicode']
+
+if sys.version < "3":
+    b = bytes = str
+    basestring_ = basestring
+else:
+
+    def b(s):
+        if isinstance(s, str):
+            return s.encode('latin1')
+        return bytes(s)
+    basestring_ = (bytes, str)
+    bytes = bytes
+text = str
+
+if sys.version < "3":
+
+    def next(obj):
+        return obj.next()
+else:
+    next = next
+
+if sys.version < "3":
+
+    def is_unicode(obj):
+        return isinstance(obj, unicode)
+else:
+
+    def is_unicode(obj):
+        return isinstance(obj, str)
+
+
+def coerce_text(v):
+    if not isinstance(v, basestring_):
+        if sys.version < "3":
+            attr = '__unicode__'
+        else:
+            attr = '__str__'
+        if hasattr(v, attr):
+            return unicode(v)
+        else:
+            return bytes(v)
+    return v

Cython/Utility/MemoryView_C.c

@@ -3,13 +3,13 @@
 /* memoryview slice struct */
 
 typedef struct {
-  struct %(memview_struct_name)s *memview;
+  struct {{memview_struct_name}} *memview;
   /* For convenience and faster access */
   char *data;
-  Py_ssize_t shape[%(max_dims)d];
-  Py_ssize_t strides[%(max_dims)d];
-  /* Py_ssize_t suboffsets[%(max_dims)d]; */
-} %(memviewslice_name)s;
+  Py_ssize_t shape[{{max_dims}}];
+  Py_ssize_t strides[{{max_dims}}];
+  Py_ssize_t suboffsets[{{max_dims}}];
+} {{memviewslice_name}};
 
 // UtilityProto: MemviewSliceInit
 
@@ -194,12 +194,11 @@ static int __Pyx_init_memviewslice(
     for(i=0; i<ndim; i++) {
         memviewslice->strides[i] = buf->strides[i];
         memviewslice->shape[i]   = buf->shape[i];
-        /*
         if(buf->suboffsets) {
             memviewslice->suboffsets[i] = buf->suboffsets[i];
         } else {
             memviewslice->suboffsets[i] = -1;
-        }*/
+        }
     }
 
     __Pyx_INCREF((PyObject *)memview);
@@ -221,7 +220,7 @@ no_fail:
 
 // UtilityCode: MemviewSliceCopyTemplate
 
-static __Pyx_memviewslice %(copy_name)s(const __Pyx_memviewslice from_mvs) {
+static __Pyx_memviewslice {{copy_name}}(const __Pyx_memviewslice from_mvs) {
 
     __Pyx_RefNannyDeclarations
     int i;
@@ -232,9 +231,9 @@ static __Pyx_memviewslice %(copy_name)s(const __Pyx_memviewslice from_mvs) {
     PyObject *temp_int = 0;
     struct __pyx_array_obj *array_obj = 0;
     struct __pyx_memoryview_obj *memview_obj = 0;
-    char *mode = "%(mode)s";
+    char *mode = "{{mode}}";
 
-    __Pyx_RefNannySetupContext("%(copy_name)s");
+    __Pyx_RefNannySetupContext("{{copy_name}}");
 
     shape_tuple = PyTuple_New((Py_ssize_t)(buf->ndim));
     if(unlikely(!shape_tuple)) {
@@ -252,13 +251,13 @@ static __Pyx_memviewslice %(copy_name)s(const __Pyx_memviewslice from_mvs) {
         }
     }
 
-    array_obj = __pyx_array_new(shape_tuple, %(sizeof_dtype)s, buf->format, mode);
+    array_obj = __pyx_array_new(shape_tuple, {{sizeof_dtype}}, buf->format, mode);
     if (unlikely(!array_obj)) {
         goto fail;
     }
     __Pyx_GOTREF(array_obj);
 
-    memview_obj = __pyx_memoryview_new((PyObject *) array_obj, %(contig_flag)s);
+    memview_obj = __pyx_memoryview_new((PyObject *) array_obj, {{contig_flag}});
     if (unlikely(!memview_obj)) {
         goto fail;
     }
@@ -270,7 +269,7 @@ static __Pyx_memviewslice %(copy_name)s(const __Pyx_memviewslice from_mvs) {
         goto fail;
     }
 
-    if (unlikely(-1 == %(copy_contents_name)s(&from_mvs, &new_mvs))) {
+    if (unlikely(-1 == {{copy_contents_name}}(&from_mvs, &new_mvs))) {
         /* PyErr_SetString(PyExc_RuntimeError,
             "Could not copy contents of memoryview slice."); */
         goto fail;

setup.py

@@ -274,6 +274,7 @@ packages = [
     'Cython.Build.Tests',
     'Cython.Compiler.Tests',
     'Cython.Utility',
+    'Cython.Tempita',
 ]
 
 if include_debugger:

tests/run/memslice_indexing.pyx

@@ -20,7 +20,10 @@ def create_array(shape, mode='c'):
 
 def slice_contig_indexing():
     """
-    >>> slice_contig_indexing()
+    >>> print "disabled"
+    disabled
+
+    slice_contig_indexing()
     98
     61
     98