diff --git a/lexer/__pycache__/keywords.cpython-34.pyc b/lexer/__pycache__/keywords.cpython-34.pyc
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index 0000000..40baa92
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diff --git a/lexer/__pycache__/tokens.cpython-34.pyc b/lexer/__pycache__/tokens.cpython-34.pyc
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index 0000000..ad59931
Binary files /dev/null and b/lexer/__pycache__/tokens.cpython-34.pyc differ
diff --git a/lexer/gtk.h b/lexer/gtk.h
new file mode 100644
index 0000000..7b901e1
--- /dev/null
+++ b/lexer/gtk.h
@@ -0,0 +1,293 @@
+/* GTK - The GIMP Toolkit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
+ * file for a list of people on the GTK+ Team.  See the ChangeLog
+ * files for a list of changes.  These files are distributed with
+ * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
+ */
+
+#ifndef __GTK_H__
+#define __GTK_H__
+
+#define __GTK_H_INSIDE__
+
+#include <gdk/gdk.h>
+#include <gtk/gtkaboutdialog.h>
+#include <gtk/gtkaccelgroup.h>
+#include <gtk/gtkaccellabel.h>
+#include <gtk/gtkaccelmap.h>
+#include <gtk/gtkaccessible.h>
+#include <gtk/gtkactionable.h>
+#include <gtk/gtkactionbar.h>
+#include <gtk/gtkadjustment.h>
+#include <gtk/gtkappchooser.h>
+#include <gtk/gtkappchooserdialog.h>
+#include <gtk/gtkappchooserwidget.h>
+#include <gtk/gtkappchooserbutton.h>
+#include <gtk/gtkapplication.h>
+#include <gtk/gtkapplicationwindow.h>
+#include <gtk/gtkaspectframe.h>
+#include <gtk/gtkassistant.h>
+#include <gtk/gtkbbox.h>
+#include <gtk/gtkbin.h>
+#include <gtk/gtkbindings.h>
+#include <gtk/gtkborder.h>
+#include <gtk/gtkbox.h>
+#include <gtk/gtkbuildable.h>
+#include <gtk/gtkbuilder.h>
+#include <gtk/gtkbutton.h>
+#include <gtk/gtkcalendar.h>
+#include <gtk/gtkcellarea.h>
+#include <gtk/gtkcellareabox.h>
+#include <gtk/gtkcellareacontext.h>
+#include <gtk/gtkcelleditable.h>
+#include <gtk/gtkcelllayout.h>
+#include <gtk/gtkcellrenderer.h>
+#include <gtk/gtkcellrendereraccel.h>
+#include <gtk/gtkcellrenderercombo.h>
+#include <gtk/gtkcellrendererpixbuf.h>
+#include <gtk/gtkcellrendererprogress.h>
+#include <gtk/gtkcellrendererspin.h>
+#include <gtk/gtkcellrendererspinner.h>
+#include <gtk/gtkcellrenderertext.h>
+#include <gtk/gtkcellrenderertoggle.h>
+#include <gtk/gtkcellview.h>
+#include <gtk/gtkcheckbutton.h>
+#include <gtk/gtkcheckmenuitem.h>
+#include <gtk/gtkclipboard.h>
+#include <gtk/gtkcolorbutton.h>
+#include <gtk/gtkcolorchooser.h>
+#include <gtk/gtkcolorchooserdialog.h>
+#include <gtk/gtkcolorchooserwidget.h>
+#include <gtk/gtkcolorutils.h>
+#include <gtk/gtkcombobox.h>
+#include <gtk/gtkcomboboxtext.h>
+#include <gtk/gtkcontainer.h>
+#include <gtk/gtkcssprovider.h>
+#include <gtk/gtkcsssection.h>
+#include <gtk/gtkdebug.h>
+#include <gtk/gtkdialog.h>
+#include <gtk/gtkdnd.h>
+#include <gtk/gtkdragdest.h>
+#include <gtk/gtkdragsource.h>
+#include <gtk/gtkdrawingarea.h>
+#include <gtk/gtkeditable.h>
+#include <gtk/gtkentry.h>
+#include <gtk/gtkentrybuffer.h>
+#include <gtk/gtkentrycompletion.h>
+#include <gtk/gtkenums.h>
+#include <gtk/gtkeventbox.h>
+#include <gtk/gtkeventcontroller.h>
+#include <gtk/gtkexpander.h>
+#include <gtk/gtkfixed.h>
+#include <gtk/gtkfilechooser.h>
+#include <gtk/gtkfilechooserbutton.h>
+#include <gtk/gtkfilechooserdialog.h>
+#include <gtk/gtkfilechoosernative.h>
+#include <gtk/gtkfilechooserwidget.h>
+#include <gtk/gtkfilefilter.h>
+#include <gtk/gtkflowbox.h>
+#include <gtk/gtkfontbutton.h>
+#include <gtk/gtkfontchooser.h>
+#include <gtk/gtkfontchooserdialog.h>
+#include <gtk/gtkfontchooserwidget.h>
+#include <gtk/gtkframe.h>
+#include <gtk/gtkgesture.h>
+#include <gtk/gtkgesturedrag.h>
+#include <gtk/gtkgesturelongpress.h>
+#include <gtk/gtkgesturemultipress.h>
+#include <gtk/gtkgesturepan.h>
+#include <gtk/gtkgesturerotate.h>
+#include <gtk/gtkgesturesingle.h>
+#include <gtk/gtkgestureswipe.h>
+#include <gtk/gtkgesturezoom.h>
+#include <gtk/gtkglarea.h>
+#include <gtk/gtkgrid.h>
+#include <gtk/gtkheaderbar.h>
+#include <gtk/gtkicontheme.h>
+#include <gtk/gtkiconview.h>
+#include <gtk/gtkimage.h>
+#include <gtk/gtkimcontext.h>
+#include <gtk/gtkimcontextinfo.h>
+#include <gtk/gtkimcontextsimple.h>
+#include <gtk/gtkimmulticontext.h>
+#include <gtk/gtkinfobar.h>
+#include <gtk/gtkinvisible.h>
+#include <gtk/gtklabel.h>
+#include <gtk/gtklayout.h>
+#include <gtk/gtklevelbar.h>
+#include <gtk/gtklinkbutton.h>
+#include <gtk/gtklistbox.h>
+#include <gtk/gtkliststore.h>
+#include <gtk/gtklockbutton.h>
+#include <gtk/gtkmain.h>
+#include <gtk/gtkmenu.h>
+#include <gtk/gtkmenubar.h>
+#include <gtk/gtkmenubutton.h>
+#include <gtk/gtkmenuitem.h>
+#include <gtk/gtkmenushell.h>
+#include <gtk/gtkmenutoolbutton.h>
+#include <gtk/gtkmessagedialog.h>
+#include <gtk/gtkmodelbutton.h>
+#include <gtk/gtkmodules.h>
+#include <gtk/gtkmountoperation.h>
+#include <gtk/gtknativedialog.h>
+#include <gtk/gtknotebook.h>
+#include <gtk/gtkoffscreenwindow.h>
+#include <gtk/gtkorientable.h>
+#include <gtk/gtkoverlay.h>
+#include <gtk/gtkpadcontroller.h>
+#include <gtk/gtkpagesetup.h>
+#include <gtk/gtkpapersize.h>
+#include <gtk/gtkpaned.h>
+#include <gtk/gtkplacessidebar.h>
+#include <gtk/gtkpopover.h>
+#include <gtk/gtkpopovermenu.h>
+#include <gtk/gtkprintcontext.h>
+#include <gtk/gtkprintoperation.h>
+#include <gtk/gtkprintoperationpreview.h>
+#include <gtk/gtkprintsettings.h>
+#include <gtk/gtkprogressbar.h>
+#include <gtk/gtkradiobutton.h>
+#include <gtk/gtkradiomenuitem.h>
+#include <gtk/gtkradiotoolbutton.h>
+#include <gtk/gtkrange.h>
+#include <gtk/gtkrecentchooser.h>
+#include <gtk/gtkrecentchooserdialog.h>
+#include <gtk/gtkrecentchoosermenu.h>
+#include <gtk/gtkrecentchooserwidget.h>
+#include <gtk/gtkrecentfilter.h>
+#include <gtk/gtkrecentmanager.h>
+#include <gtk/gtkrender.h>
+#include <gtk/gtkrevealer.h>
+#include <gtk/gtkscale.h>
+#include <gtk/gtkscalebutton.h>
+#include <gtk/gtkscrollable.h>
+#include <gtk/gtkscrollbar.h>
+#include <gtk/gtkscrolledwindow.h>
+#include <gtk/gtksearchbar.h>
+#include <gtk/gtksearchentry.h>
+#include <gtk/gtkselection.h>
+#include <gtk/gtkseparator.h>
+#include <gtk/gtkseparatormenuitem.h>
+#include <gtk/gtkseparatortoolitem.h>
+#include <gtk/gtksettings.h>
+#include <gtk/gtkshortcutlabel.h>
+#include <gtk/gtkshortcutsgroup.h>
+#include <gtk/gtkshortcutssection.h>
+#include <gtk/gtkshortcutsshortcut.h>
+#include <gtk/gtkshortcutswindow.h>
+#include <gtk/gtkshow.h>
+#include <gtk/gtkstacksidebar.h>
+#include <gtk/gtksizegroup.h>
+#include <gtk/gtksizerequest.h>
+#include <gtk/gtkspinbutton.h>
+#include <gtk/gtkspinner.h>
+#include <gtk/gtkstack.h>
+#include <gtk/gtkstackswitcher.h>
+#include <gtk/gtkstatusbar.h>
+#include <gtk/gtkstylecontext.h>
+#include <gtk/gtkstyleprovider.h>
+#include <gtk/gtkswitch.h>
+#include <gtk/gtktextattributes.h>
+#include <gtk/gtktextbuffer.h>
+#include <gtk/gtktextbufferrichtext.h>
+#include <gtk/gtktextchild.h>
+#include <gtk/gtktextiter.h>
+#include <gtk/gtktextmark.h>
+#include <gtk/gtktexttag.h>
+#include <gtk/gtktexttagtable.h>
+#include <gtk/gtktextview.h>
+#include <gtk/gtktogglebutton.h>
+#include <gtk/gtktoggletoolbutton.h>
+#include <gtk/gtktoolbar.h>
+#include <gtk/gtktoolbutton.h>
+#include <gtk/gtktoolitem.h>
+#include <gtk/gtktoolitemgroup.h>
+#include <gtk/gtktoolpalette.h>
+#include <gtk/gtktoolshell.h>
+#include <gtk/gtktooltip.h>
+#include <gtk/gtktestutils.h>
+#include <gtk/gtktreednd.h>
+#include <gtk/gtktreemodel.h>
+#include <gtk/gtktreemodelfilter.h>
+#include <gtk/gtktreemodelsort.h>
+#include <gtk/gtktreeselection.h>
+#include <gtk/gtktreesortable.h>
+#include <gtk/gtktreestore.h>
+#include <gtk/gtktreeview.h>
+#include <gtk/gtktreeviewcolumn.h>
+#include <gtk/gtktypebuiltins.h>
+#include <gtk/gtktypes.h>
+#include <gtk/gtkversion.h>
+#include <gtk/gtkviewport.h>
+#include <gtk/gtkvolumebutton.h>
+#include <gtk/gtkwidget.h>
+#include <gtk/gtkwidgetpath.h>
+#include <gtk/gtkwindow.h>
+#include <gtk/gtkwindowgroup.h>
+
+#ifndef GTK_DISABLE_DEPRECATED
+#include <gtk/deprecated/gtkarrow.h>
+#include <gtk/deprecated/gtkactivatable.h>
+#include <gtk/deprecated/gtkaction.h>
+#include <gtk/deprecated/gtkactiongroup.h>
+#include <gtk/deprecated/gtkalignment.h>
+#include <gtk/deprecated/gtkcolorsel.h>
+#include <gtk/deprecated/gtkcolorseldialog.h>
+#include <gtk/deprecated/gtkfontsel.h>
+#include <gtk/deprecated/gtkgradient.h>
+#include <gtk/deprecated/gtkhandlebox.h>
+#include <gtk/deprecated/gtkhbbox.h>
+#include <gtk/deprecated/gtkhbox.h>
+#include <gtk/deprecated/gtkhpaned.h>
+#include <gtk/deprecated/gtkhsv.h>
+#include <gtk/deprecated/gtkhscale.h>
+#include <gtk/deprecated/gtkhscrollbar.h>
+#include <gtk/deprecated/gtkhseparator.h>
+#include <gtk/deprecated/gtkiconfactory.h>
+#include <gtk/deprecated/gtkimagemenuitem.h>
+#include <gtk/deprecated/gtkmisc.h>
+#include <gtk/deprecated/gtknumerableicon.h>
+#include <gtk/deprecated/gtkradioaction.h>
+#include <gtk/deprecated/gtkrc.h>
+#include <gtk/deprecated/gtkrecentaction.h>
+#include <gtk/deprecated/gtkstatusicon.h>
+#include <gtk/deprecated/gtkstock.h>
+#include <gtk/deprecated/gtkstyle.h>
+#include <gtk/deprecated/gtkstyleproperties.h>
+#include <gtk/deprecated/gtksymboliccolor.h>
+#include <gtk/deprecated/gtktable.h>
+#include <gtk/deprecated/gtktearoffmenuitem.h>
+#include <gtk/deprecated/gtkthemingengine.h>
+#include <gtk/deprecated/gtktoggleaction.h>
+#include <gtk/deprecated/gtkuimanager.h>
+#include <gtk/deprecated/gtkvbbox.h>
+#include <gtk/deprecated/gtkvbox.h>
+#include <gtk/deprecated/gtkvpaned.h>
+#include <gtk/deprecated/gtkvscale.h>
+#include <gtk/deprecated/gtkvscrollbar.h>
+#include <gtk/deprecated/gtkvseparator.h>
+#endif /* GTK_DISABLE_DEPRECATED */
+
+#include <gtk/gtk-autocleanups.h>
+
+#undef __GTK_H_INSIDE__
+
+#endif /* __GTK_H__ */
diff --git a/lexer/keywords.py b/lexer/keywords.py
new file mode 100644
index 0000000..ea03bd7
--- /dev/null
+++ b/lexer/keywords.py
@@ -0,0 +1,107 @@
+# (c) 2018 Jan Lerking
+# Python lexer for c header files.
+# Used for creating corresponding NASM include files.
+# Contains tokens expanded with reserved 'C' keywords
+
+def init():
+    global tokens
+    tokens = [
+        'CSTART',
+        'CMID',
+        'CEND',
+        'RPAREN',
+        'LPAREN',
+        'ENDLINE',
+        'POINTER',
+        'PREPROCESS',
+        'ID',
+        'PLUS',
+        'MINUS',
+        'DIV',
+        'MULT',
+        'ASSIGN',
+        'EQUAL',
+        'LBRACE',
+        'RBRACE',
+        'COMMA',
+        'SEMICOLON',
+        'LANGLE',
+        'RANGLE'
+    ]
+
+    reserved = {
+        'auto'  : 'AUTO',
+        'break' : 'BREAK',
+        'case' : 'CASE',
+        'char' : 'CHAR',
+        'const' : 'CONST',
+        'continue' : 'CONTINUE',
+        'default' : 'DEFAULT',
+        'do' : 'DO',
+        'int' : 'INT',
+        'long' : 'LONG',
+        'register' : 'REGISTER',
+        'return' : 'RETURN',
+        'short' : 'SHORT',
+        'signed' : 'SIGNED',
+        'sizeof' : 'SIZEOF',
+        'static' : 'STATIC',
+        'struct' : 'STRUCT',
+        'switch' : 'SWITCH',
+        'typedef' : 'TYPEDEF',
+        'union' : 'UNION',
+        'unsigned' : 'UNSIGNED',
+        'void' : 'VOID',
+        'volatile' : 'VOLATILE',
+        'while' : 'WHILE',
+        'double' : 'DOUBLE',
+        'else' : 'ELSE',
+        'enum' : 'ENUM',
+        'extern' : 'EXTERN',
+        'float' : 'FLOAT',
+        'for' : 'FOR',
+        'goto' : 'GOTO',
+        'if' : 'IF'
+    }
+
+    global preprocessor_directives
+    preprocessor_directives = {
+        '#include' : 'PREPROCESS',
+        '#define' : 'PREPROCESS',
+        '#undef' : 'PREPROCESS',
+        '#if' : 'PREPROCESS',
+        '#ifdef' : 'PREPROCESS',
+        '#ifndef' : 'PREPROCESS',
+        '#error' : 'PREPROCESS',
+        '__FILE__' : 'PREPROCESS',
+        '__LINE__' : 'PREPROCESS',
+        '__DATE__' : 'PREPROCESS',
+        '__TIME__' : 'PREPROCESS',
+        '__TIMESTAMP__' : 'PREPROCESS',
+        'pragma' : 'PREPROCESS',
+        '#' : 'PREPROCESS',
+        '##' : 'PREPROCESS'
+    }
+
+    global regular
+    regular = {
+        '/*' : 'CSTART',
+        '*' : 'CMID',
+        '*/' : 'CEND',
+        '=' : 'ASSIGN',
+        '==' : 'EQUAL',
+        '{' : 'LBRACE',
+        '}' : 'RBRACE',
+        '\+' : 'PLUS',
+        '-' : 'MINUS',
+        '\*' : 'MULT',
+        '/' : 'DIV',
+        '\(' : 'LPAREN',
+        '\)' : 'RPAREN',
+        ',' : 'COMMA',
+        ';' : 'SEMICOLON',
+        '\<' : 'LANGLE',
+        '\>' : 'RANGLE'
+    }
+
+    tokens += reserved.values()
\ No newline at end of file
diff --git a/lexer/lexer.py b/lexer/lexer.py
new file mode 100644
index 0000000..fff4e30
--- /dev/null
+++ b/lexer/lexer.py
@@ -0,0 +1,22 @@
+# (c) 2018 Jan Lerking
+# Python lexer for c header files.
+# Used for creating corresponding NASM include files.
+
+import keywords
+import os
+
+keywords.init()
+
+lexed_line = []
+
+def lex_line(l):
+    prep = keywords.preprocessor_directives
+    reg = keywords.regular
+    for w in l:
+        if w in prep:
+            lexed_line.append(prep(w))
+            lexed_line.append(w)
+            break
+        if w in reg:
+            lexed_line.append(reg(w))
+            lexed_line.append(w)
\ No newline at end of file