From 5697065e11fd593042ad572ba032b96fddad9cb5 Mon Sep 17 00:00:00 2001
From: Stefano Karapetsas <stefano@karapetsas.com>
Date: Wed, 29 Jan 2014 16:07:41 +0100
Subject: Add tool to generate plugin templates

---
 tools/preprocessor.py | 161 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 tools/preprocessor.py

(limited to 'tools/preprocessor.py')

diff --git a/tools/preprocessor.py b/tools/preprocessor.py
new file mode 100644
index 00000000..f5409cad
--- /dev/null
+++ b/tools/preprocessor.py
@@ -0,0 +1,161 @@
+# -*- coding: utf-8 -*-
+
+# preprocessor.py - simple preprocessor for plugin template files
+# This file is part of pluma
+#
+# Copyright (C) 2006 - Steve Frécinaux
+#
+# pluma is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# pluma 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pluma; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, 
+# Boston, MA  02110-1301  USA
+
+import sys
+import re
+
+class DeepnessException(Exception):
+    def __init__(self):
+        Exception.__init__(self)
+
+statements = [re.compile("^##\s*%s\s*$" % pattern) for pattern in
+                        ['(?P<stmt>ifdef|ifndef)\s+(?P<key>[^\s]+)',
+                         '(?P<stmt>elif|if)\s+(?P<expr>.+)',
+                         '(?P<stmt>else|endif)',
+                         '(?P<stmt>define)\s+(?P<key>[^\s]+)(\s+(?P<val>.+))?',
+                         '(?P<stmt>undef)\s+(?P<key>[^\s]+)']]
+variable = re.compile("##\((?P<name>[a-zA-Z_][a-zA-Z0-9_]*)(?P<mods>(\.[a-z]+)+)?\)")
+
+
+def _eval(expr, macros):
+    return eval(expr,
+                {'defined': lambda x: macros.has_key(x)},
+                macros)
+
+def _subvar(match, macros):
+    name = match.group('name')
+    if name in macros:
+        val = str(macros[name])
+        if val is None:
+            return ''
+    else:
+        return ''
+    
+    mods = match.group('mods')
+    if mods is not None:
+        for mod in mods[1:].split('.'):
+            if mod == 'lower':
+                val = val.lower()
+            elif mod == 'upper':
+                val = val.upper()
+            elif mod == 'camel':
+                val = ''.join(i.capitalize() 
+                              for i in val.split('_'))
+    return val
+
+def process(infile = sys.stdin, outfile = sys.stdout, macros = {}):
+    if not isinstance(infile, file):
+        infile = open(infile, mode = 'r')
+        close_infile = True
+    else:
+        close_infile = False
+
+    if not isinstance(outfile, file):
+        outfile = open(outfile, mode = 'w')
+        close_outfile = True
+    else:
+        close_outfile = False
+    
+    deepness = 0
+    writing_disabled = None
+    
+    for line in infile:
+        # Skip comments
+        if line[0:3].lower() == '##c':
+            continue
+
+        # Check whether current line is a preprocessor directive        
+        for statement in statements:
+            match = statement.match(line)
+            if match: break
+    
+        if match is not None:
+            stmt = match.group('stmt')
+
+            if stmt == "define":
+                if writing_disabled is None:
+                    key = match.group('key')
+                    val = match.group('val')
+                    macros[key] = val
+
+            elif stmt == "undef":
+                if writing_disabled is None:
+                    key = match.group('key')
+                    if key in macros:
+                        del macros[key]
+
+            elif stmt == "ifdef":
+                deepness += 1
+                if writing_disabled is None and \
+                   match.group('key') not in macros:
+                    writing_disabled = deepness
+
+            elif stmt == "ifndef":
+                deepness += 1
+                if writing_disabled is None and \
+                   match.group('key') in macros:
+                    writing_disabled = deepness                    
+
+            elif stmt == "if":
+                deepness += 1
+                if writing_disabled is None and \
+                   not _eval(match.group('expr'), macros):
+                       writing_disabled = deepness
+
+            elif stmt == "elif":
+                if deepness == 0:
+                    raise DeepnessException()
+                if writing_disabled is None and \
+                   not _eval(match.group('expr'), macros):
+                    writing_disabled = deepness
+                elif writing_disabled == deepness:
+                    writing_disabled = None
+
+            elif stmt == "else":
+                if deepness == 0:
+                    raise DeepnessException()
+                if writing_disabled is None:
+                    writing_disabled = deepness
+                elif writing_disabled == deepness:
+                    writing_disabled = None
+
+            elif stmt == "endif":
+                if deepness == 0:
+                    raise DeepnessException()
+                if writing_disabled is not None and \
+                   writing_disabled == deepness:
+                    writing_disabled = None
+                deepness -= 1
+
+        # Do variable substitution in the remaining lines
+        elif writing_disabled is None:
+            outfile.write(re.sub(variable, 
+                                 lambda m: _subvar(m, macros),
+                                 line))
+
+    if deepness != 0:
+        raise DeepnessException()
+
+    if close_infile: infile.close()
+    if close_outfile: outfile.close()
+
+# ex:ts=4:et:
-- 
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