[aspell-devel] Django filter

[Sergey Poznyakoff]

Hello,

Attached patch implements a filter for Django templates.

Regads,
Sergey

Index: Makefile.am
===================================================================
RCS file: /sources/aspell/aspell/Makefile.am,v
retrieving revision 1.64
diff -p -u -r1.64 Makefile.am
--- Makefile.am 7 Jul 2011 06:21:05 -0000       1.64
+++ Makefile.am 10 Mar 2012 14:52:13 -0000
@@ -182,7 +182,8 @@ optfiles = \
   modules/filter/html-filter.info\
   modules/filter/context-filter.info\
   modules/filter/nroff-filter.info\
-  modules/filter/texinfo-filter.info
+  modules/filter/texinfo-filter.info\
+  modules/filter/django-filter.info

 ### Add any extra data files your filter uses here
 fltdata = \
@@ -222,7 +223,8 @@ libaspell_la_SOURCES +=\
   modules/filter/sgml.cpp\
   modules/filter/context.cpp\
   modules/filter/nroff.cpp\
-  modules/filter/texinfo.cpp
+  modules/filter/texinfo.cpp\
+  modules/filter/django.cpp

 else # not COMPILE_IN_FILTERS

@@ -233,7 +235,8 @@ filter_ldflags = -module -avoid-version
 ### must look like lib<filtername>-filter.la see development manual
 filter_LTLIBRARIES = email-filter.la tex-filter.la\
                     sgml-filter.la context-filter.la\
-                     nroff-filter.la texinfo-filter.la
+                     nroff-filter.la texinfo-filter.la\
+                     django-filter.la

 email_filter_la_SOURCES = modules/filter/email.cpp
 email_filter_la_LIBADD = libaspell.la
@@ -259,6 +262,10 @@ texinfo_filter_la_SOURCES  = modules/fil
 texinfo_filter_la_LIBADD = libaspell.la
 texinfo_filter_la_LDFLAGS  = ${filter_ldflags}

+django_filter_la_SOURCES  = modules/filter/django.cpp
+django_filter_la_LIBADD = libaspell.la
+django_filter_la_LDFLAGS  = ${filter_ldflags}
+
 ### Before this line add the corresponding <yourfilterlibrary>_SOURCES and
 ### <yourfilterlibrary>_LIBADD lines.  The later at least has to look
 ### like <yourfilterlibrary>_LIBADD = ${top_builddir}/lib/libaspell.la
--- /dev/null   2008-08-31 00:18:45.000000000 +0300
+++ modules/filter/django.cpp   2012-03-10 13:08:16.000000000 +0200
@@ -0,0 +1,130 @@
+/* This file is part of The New Aspell
+
+   Copyright (C) 2012 Sergey Poznyakoff
+
+   GNU Aspell free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   GNU Aspell is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with GNU Aspell.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+
+#include "settings.h"
+#include "asc_ctype.hpp"
+#include "config.hpp"
+#include "indiv_filter.hpp"
+#include "string_map.hpp"
+#include "mutable_container.hpp"
+#include "clone_ptr.hpp"
+#include "filter_char_vector.hpp"
+
+namespace
+{
+  using namespace aspell;
+
+  class DjangoFilter : public NormalFilter
+  {
+  private:
+    enum filter_state {
+      initial,           // initial state: print everything
+      brace,             // open brace seen
+      escape,            // within Django braces: skip until close_brace
+      maybe_close        // close_brace[0] seen
+    } state;
+
+    char close_brace[2]; // sequence of characters that ends brace state.
+
+    bool inline process_char (FilterChar::Chr c);
+
+  public:
+
+    PosibErr<bool> setup(Config *)
+    {
+      set_name("django");
+      set_order_num(0.20);
+      reset();
+      return true;
+    };
+    void reset()
+    {
+      state = initial;
+    };
+    void process(FilterChar * &, FilterChar * &);
+  };
+
+  bool DjangoFilter::process_char(FilterChar::Chr c)
+  {
+    switch (state)
+      {
+      case initial:
+       if (c == '{')
+         state = brace;
+       return false;
+
+      case brace:
+       switch (c)
+         {
+         case '#': /* comment */
+         case '%': /* code */
+           close_brace[0] = c;
+           close_brace[1] = '}';
+           state = escape;
+           break;
+
+         case '{': /* variable reference */
+           close_brace[0] = '}';
+           close_brace[1] = '}';
+           state = escape;
+           break;
+
+         default:
+           state = initial;
+         }
+       return false;
+
+      case escape:
+       if (c == close_brace[0])
+         state = maybe_close;
+       return true;
+
+      case maybe_close:
+       if (c == close_brace[1])
+         state = initial;
+       else
+         state = escape;
+       return false;
+      }
+    return true;
+  }
+
+  void DjangoFilter::process(FilterChar * & str, FilterChar * & stop)
+  {
+    FilterChar * cur = str;
+    for (; cur != stop; cur++)
+      {
+       if (process_char (*cur))
+         *cur = ' ';
+      }
+  }
+}
+
+C_EXPORT
+IndividualFilter * new_aspell_django_filter() {
+  return new DjangoFilter;
+}
+