From 2bd385beb755caee756b9e9c671a2854a430edd3 Mon Sep 17 00:00:00 2001
From: Ian Bicking <ianb@colorstudy.com>
Date: Thu, 2 Sep 2010 01:12:34 -0500
Subject: Fix cases where whitespace isn't stripped properly (when there are
 multiple directive-only lines next to each other).

---
 tempita/__init__.py     | 17 ++++++++++++-----
 tests/test_template.txt | 29 +++++++++++++++++++++++++++--
 2 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/tempita/__init__.py b/tempita/__init__.py
index c4c872d..175ccb4 100644
--- a/tempita/__init__.py
+++ b/tempita/__init__.py
@@ -647,8 +647,8 @@ def lex(s, name=None, trim_whitespace=True, line_offset=0):
         chunks = trim_lex(chunks)
     return chunks
 
-statement_re = re.compile(r'^(?:if |elif |else |for |def |inherit |default |py:)')
-single_statements = ['endif', 'endfor', 'enddef', 'continue', 'break']
+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')
 
@@ -663,6 +663,7 @@ def trim_lex(tokens):
        >>> 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_):
@@ -682,12 +683,17 @@ def trim_lex(tokens):
         if (not isinstance(next, basestring_)
             or not isinstance(prev, basestring_)):
             continue
-        if ((not prev or trail_whitespace_re.search(prev)
-             or (i == 1 and not prev.strip()))
+        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 or lead_whitespace_re.search(next)
                  or (i == len(tokens)-2 and not next.strip()))):
             if prev:
-                if i == 1 and not prev.strip():
+                if ((i == 1 and not prev.strip())
+                    or prev_ok == 'last'):
                     tokens[i-1] = ''
                 else:
                     m = trail_whitespace_re.search(prev)
@@ -695,6 +701,7 @@ def trim_lex(tokens):
                     prev = prev[:m.start()+1]
                     tokens[i-1] = prev
             if next:
+                last_trim = i
                 if i == len(tokens)-2 and not next.strip():
                     tokens[i+1] = ''
                 else:
diff --git a/tests/test_template.txt b/tests/test_template.txt
index 60c3afb..7c66a7f 100644
--- a/tests/test_template.txt
+++ b/tests/test_template.txt
@@ -9,7 +9,7 @@ example::
     'Hi Ian'
     >>> Template('Hi {{repr(name)}}').substitute(name='Ian')
     "Hi 'Ian'"
-    >>> Template('Hi {{name+1}}').substitute(name='Ian')
+    >>> Template('Hi {{name+1}}').substitute(name='Ian') # doctest: +IGNORE_EXCEPTION_DETAIL
     Traceback (most recent call last):
         ...
     TypeError: cannot concatenate 'str' and 'int' objects at line 1 column 6
@@ -59,7 +59,7 @@ Also Python blocks::
 
 And some syntax errors::
 
-    >>> t = Template('{{if x}}', name='foo.html')
+    >>> t = Template('{{if x}}', name='foo.html') # doctest: +IGNORE_EXCEPTION_DETAIL
     Traceback (most recent call last):
         ...
     TemplateError: No {{endif}} at line 1 column 3 in foo.html
@@ -180,3 +180,28 @@ Then we'll define a template that inherits::
     >>> print tmpl2.substitute(master='test2').strip()
     Something:
 
+Whitespace
+==========
+
+Whitespace is removed from templates when a directive is on a line by
+itself.  For example::
+
+    >>> #import sys; sys.debug = True
+    >>> tmpl = Template('''\
+    ... {{for i, item in enumerate(['a', 'b'])}}
+    ...     {{if i % 2 == 0}}
+    ...   <div class='even'>
+    ...     {{else}}
+    ...   <div class='odd'>
+    ...     {{endif}}
+    ...     {{item}}
+    ...   </div>
+    ... {{endfor}}''')
+    >>> print tmpl.substitute()
+      <div class='even'>
+        a
+      </div>
+      <div class='odd'>
+        b
+      </div>
+    <BLANKLINE>
-- 
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