MAINT: vendor Tempita in scipy/_build_utils

This is an unmodified copy from `Cython/Tempita/` as of commit
`023d4af35` in Cython's master branch (21 April 2024).
Tempita hasn't been maintained independently on PyPI for 10+ years;
we've used the Cython version which is semi-public (undocumented)
for a while, with the note that we should vendor it if that ever
fails. It now failed once (see scipy#20535), and conceptually that
makes sense - this is the only place where we don't invoke the
`cython` executable but actually do `import Cython`. That can fail
in a distro setup where Cython is installed for a different Python
interpreter than the active one.

The license file was taken over from the `maintenance/1.26.x` branch
in the `numpy` repo - which came from the original upstream repo
for Tempita (now disappeared) as discussed in numpy#8096.
See scipy#20572 for more clarification about the MIT license that
this code is under.

LICENSES_bundled.txt

@@ -281,3 +281,8 @@ Name: array-api-compat
 Files: scipy/_lib/array-api-compat/*
 License: MIT
   For details, see scipy/_lib/array-api-compat/LICENCE
+
+Name: Tempita
+Files: scipy/_build_utils/tempita/*
+License: MIT
+  For details, see scipy/_build_utils/tempita/LICENCE.txt

scipy/_build_utils/tempita.py

@@ -3,9 +3,7 @@
 import os
 import argparse
 
-from Cython import Tempita as tempita
-# XXX: If this import ever fails (does it really?), vendor either
-# cython.tempita or numpy/npy_tempita.
+import tempita
 
 
 def process_tempita(fromfile, outfile=None):

scipy/_build_utils/tempita/LICENSE.txt

@@ -0,0 +1,20 @@
+Copyright (c) 2008 Ian Bicking and Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

scipy/_build_utils/tempita/__init__.py

@@ -0,0 +1,4 @@
+# The original Tempita implements all of its templating code here.
+# Moved it to _tempita.py to make the compilation portable.
+
+from ._tempita import *

scipy/_build_utils/tempita/_looper.py

@@ -0,0 +1,156 @@
+"""
+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
+
+"""
+
+basestring_ = (bytes, str)
+
+__all__ = ['looper']
+
+
+class looper:
+    """
+    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:
+
+    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
+
+
+class loop_pos:
+
+    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__)
+
+    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]