first commit

.gitignore

@@ -0,0 +1,2 @@
+build/*
+.idea

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program 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 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

Makefile

@@ -0,0 +1,36 @@
+APPNAME=$(shell basename `pwd`)
+LDFLAGS="-s"
+TS=$(shell date -u '+%Y/%m/%d %H:%M:%S')
+
+all: clean test build install
+
+build/$(APPNAME):
+	@echo $(TS) Building $(APPAME) ...
+	@go build -ldflags $(LDFLAGS) -o build/$(APPNAME) platform/main/main.go
+	@echo $(TS) Done.
+
+build: build/$(APPNAME)
+
+clean:
+	@echo $(TS) Cleaning up previous build ...
+	@rm -f build/*
+	@echo $(TS) Done.
+
+install:
+	@echo $(TS) Installing $(APPNAME) ...
+	@cp build/$(APPNAME) $(GOPATH)/bin/
+	@mkdir -p $(HOME)/esp32/
+	@cp infrastructure/ino/mapping.json $(HOME)/esp32/mapping.json
+	@echo $(TS) Done.
+
+packages:
+	@echo $(TS) Installing Go packages ...
+	@go get -u github.com/andygeiss/assert
+	@go get -u github.com/andygeiss/esp32-controller
+	@go get -u github.com/andygeiss/log
+	@echo $(TS) Done.
+
+test:
+	@echo $(TS) Testing ...
+	@go test -v ./...
+	@echo $(TS) Done.

README.md

@@ -0,0 +1,44 @@
+# ESP32 Transpiler
+
+[![](https://goreportcard.com/badge/github.com/andygeiss/esp32-transpiler)](https://goreportcard.com/report/github.com/andygeiss/esp32-transpiler)
+
+## Purpose
+
+The [Arduino IDE](https://www.arduino.cc/en/Main/Software) is easy to use.
+But I faced problems like maintainability and testability at more complicated IoT projects.
+I needed to compile and flash the ESP32 before testing my code functionality by doing it 100% manually.
+
+This solution transpiles Golang into Arduino code, which can be compiled to an image by using the ESP32 toolchain.
+Now I am able to use a fully automated testing approach instead of doing it 100% manually.
+
+**Important**: The Transpiler only supports a small subset of the [Golang Language Specification](https://golang.org/ref/spec).
+Look at the tests in <code>infrastructure/ino/worker_test.go</code> for more information.
+
+## Installation
+
+First install necessary packages by using:
+
+    make packages
+
+## Test and Build
+
+Now Build the transpiler executable by running:
+
+    make
+
+## Install
+
+Copy the transpiler executable into your <code>$GOPATH/bin</code> directory.
+Then copy the file which will be used as mapping Golang to Arduino-API:
+
+    make install
+
+## Usage
+
+    Usage of esp32-transpiler:
+      -mapping string
+            API Mapping file (default "/home/user/esp32/mapping.json")
+      -source string
+            Golang source file
+      -target string
+            Arduino sketch file

application/transpile/transpile.go

@@ -0,0 +1,30 @@
+package transpile
+
+import (
+	"fmt"
+	"github.com/andygeiss/esp32-transpiler/business/transpiler"
+	"github.com/andygeiss/esp32-transpiler/business/worker"
+)
+
+// Transpiler uses a given worker to main source code.
+type Transpiler struct {
+	w worker.Worker
+}
+
+const (
+	// ErrorTranspilerWorkerIsNil ...
+	ErrorTranspilerWorkerIsNil = "Worker should not be nil"
+)
+
+// NewTranspiler creates a new transpiler and returns its address.
+func NewTranspiler(w worker.Worker) transpiler.Transpiler {
+	return &Transpiler{w}
+}
+
+// Transpile invokes the workers
+func (c *Transpiler) Transpile() error {
+	if c.w == nil {
+		return fmt.Errorf("Error: %v", ErrorTranspilerWorkerIsNil)
+	}
+	return c.w.Start()
+}

application/transpile/transpile_test.go

@@ -0,0 +1,34 @@
+package transpile_test
+
+import (
+	"bytes"
+	. "github.com/andygeiss/assert"
+	"github.com/andygeiss/esp32-transpiler/application/transpile"
+	"github.com/andygeiss/esp32-transpiler/business/worker"
+	"io"
+	"testing"
+)
+
+type mockupWorker struct {
+	in  io.Reader
+	out io.Writer
+}
+
+func (w *mockupWorker) Prepare(source []worker.Source) (chan worker.Source, error) {
+	out := make(chan worker.Source)
+	return out, nil
+}
+func (w *mockupWorker) Start() error {
+	return nil
+}
+func (w *mockupWorker) Transform(source chan worker.Source) (chan worker.Target, error) {
+	out := make(chan worker.Target)
+	return out, nil
+}
+
+func TestTranspileErrorShouldBeNil(t *testing.T) {
+	var in, out bytes.Buffer
+	worker := &mockupWorker{&in, &out}
+	trans := transpile.NewTranspiler(worker)
+	Assert(t, trans.Transpile(), IsNil())
+}

business/transpiler/transpiler.go

@@ -0,0 +1,6 @@
+package transpiler
+
+// Transpiler specifies the behaviour of taking Go source code and transforming it into another language.
+type Transpiler interface {
+	Transpile() error
+}

business/worker/mapping.go

@@ -0,0 +1,7 @@
+package worker
+
+// Mapping specifies the business logic to apply transformation to a specific identifier.
+type Mapping interface {
+	Apply(ident string) string
+	Read() error
+}

business/worker/source.go

@@ -0,0 +1,6 @@
+package worker
+
+// Source stores the code which will be transformed into another format.
+type Source interface {
+	String() string
+}

business/worker/target.go

@@ -0,0 +1,6 @@
+package worker
+
+// Target stores the result of the transformation process.
+type Target interface {
+	String() string
+}

business/worker/worker.go

@@ -0,0 +1,6 @@
+package worker
+
+// Worker specifies the business logic of transforming a source code format into another target format.
+type Worker interface {
+	Start() error
+}

infrastructure/ino/mapping.go

@@ -0,0 +1,41 @@
+package ino
+
+import (
+	"encoding/json"
+	"github.com/andygeiss/esp32-transpiler/business/worker"
+	"io/ioutil"
+)
+
+// Mapping specifies the business logic to apply transformation to a specific Golang identifier by reading simple JSON map.
+type Mapping struct {
+	Filename string            `json:"filename"`
+	Rules    map[string]string `json:"rules"`
+}
+
+// NewMapping creates a new mapping and returns its address.
+func NewMapping(filename string) worker.Mapping {
+	rules := make(map[string]string, 0)
+	return &Mapping{filename, rules}
+}
+
+// Apply checks the Golang identifier and transforms it to a specific representation.
+func (m *Mapping) Apply(ident string) string {
+	for wanted := range m.Rules {
+		if ident == wanted {
+			ident = m.Rules[ident]
+		}
+	}
+	return ident
+}
+
+// Read gets the mapping rules from the local filesystem.
+func (m *Mapping) Read() error {
+	bytes, err := ioutil.ReadFile(m.Filename)
+	if err != nil {
+		return err
+	}
+	var rules map[string]string
+	json.Unmarshal(bytes, &rules)
+	m.Rules = rules
+	return nil
+}

infrastructure/ino/mapping.json

@@ -0,0 +1,47 @@
+{
+    "digital.Low": "LOW",
+    "digital.High": "HIGH",
+    "digital.ModeInput": "INPUT",
+    "digital.ModeOutput": "OUTPUT",
+    "digital.PinMode": "pinMode",
+    "digital.Write": "digitalWrite",
+    "random.Num": "random",
+    "random.NumBetween": "random",
+    "random.Seed": "randomSeed",
+    "serial.Available": "Serial.available",
+    "serial.BaudRate300": "300",
+    "serial.BaudRate600": "600",
+    "serial.BaudRate1200": "1200",
+    "serial.BaudRate2400": "2400",
+    "serial.BaudRate4800": "4800",
+    "serial.BaudRate9600": "9600",
+    "serial.BaudRate14400": "14400",
+    "serial.BaudRate28800": "28800",
+    "serial.BaudRate38400": "38400",
+    "serial.BaudRate57600": "57600",
+    "serial.BaudRate115200": "115200",
+    "serial.Begin": "Serial.begin",
+    "serial.Print": "Serial.print",
+    "serial.Println": "Serial.println",
+    "timer.Delay": "delay",
+    "wifi": "WiFi",
+    "wifi.Begin": "WiFi.begin",
+    "wifi.BeginEncrypted": "WiFi.begin",
+    "wifi.BSSID": "WiFi.BSSID",
+    "wifi.Disconnect": "WiFi.disconnect",
+    "wifi.EncryptionType": "WiFi.encryptionType",
+    "wifi.EncryptionTypeAuto": "8",
+    "wifi.EncryptionTypeCCMP": "4",
+    "wifi.EncryptionTypeNone": "7",
+    "wifi.EncryptionTypeTKIP": "2",
+    "wifi.EncryptionTypeWEP": "5",
+    "wifi.LocalIP": "WiFi.localIP",
+    "wifi.RSSI": "WiFi.RSSI",
+    "wifi.ScanNetworks": "WiFi.scanNetworks",
+    "wifi.SetDNS": "WiFi.setDNS",
+    "wifi.SSID": "WiFi.SSID",
+    "wifi.StatusConnected": "WL_CONNECTED",
+    "wifi.StatusIdle": "WL_IDLE",
+    "Loop": "void loop",
+    "Setup": "void setup"
+}

infrastructure/ino/worker.go

@@ -0,0 +1,365 @@
+package ino
+
+import (
+	"fmt"
+	"github.com/andygeiss/esp32-transpiler/business/worker"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"io"
+	"strings"
+)
+
+const (
+	// ErrorWorkerReaderIsNil ...
+	ErrorWorkerReaderIsNil = "Reader should not be nil"
+	// ErrorWorkerWriterIsNil ...
+	ErrorWorkerWriterIsNil = "Writer should not be nil"
+)
+
+var mapping worker.Mapping
+
+// Worker specifies the business logic of transforming a source code format into another target format.
+type Worker struct {
+	in  io.Reader
+	out io.Writer
+}
+
+// NewWorker creates a a new worker and returns its address.
+func NewWorker(in io.Reader, out io.Writer, m worker.Mapping) worker.Worker {
+	mapping = m
+	return &Worker{in, out}
+}
+
+// Start ...
+func (w *Worker) Start() error {
+	if w.in == nil {
+		return fmt.Errorf("Error: %s", ErrorWorkerReaderIsNil)
+	}
+	if w.out == nil {
+		return fmt.Errorf("Error: %s", ErrorWorkerWriterIsNil)
+	}
+	// Read tokens from file by using Go's parser.
+	fset := token.NewFileSet()
+	file, err := parser.ParseFile(fset, "source.go", w.in, 0)
+	if err != nil {
+		return fmt.Errorf("ParseFile failed! %v", err)
+	}
+	// If source has no declarations then main it to an empty for loop.
+	if file.Decls == nil {
+		fmt.Fprint(w.out, "void loop() {} void setup() {}")
+		return nil
+	}
+	// Use Goroutines to work concurrently.
+	count := len(file.Decls)
+	done := make(chan bool, count)
+	dst := make([]chan string, count)
+	for i := 0; i < count; i++ {
+		dst[i] = make(chan string, 1)
+	}
+	// Start a worker with an individual channel for each declaration in the source file.
+	for i, decl := range file.Decls {
+		go handleDecl(i, decl, dst[i], done)
+	}
+	// Wait for all workers are done.
+	for i := 0; i < count; i++ {
+		select {
+		case <-done:
+		}
+	}
+	// Print the ordered result.
+	for i := 0; i < count; i++ {
+		for content := range dst[i] {
+			w.out.Write([]byte(content))
+		}
+	}
+	// Print the AST.
+	//ast.Fprint(os.Stderr, fset, file, nil)
+	return nil
+}
+
+func handleAssignStmt(stmt ast.Stmt) string {
+	a := stmt.(*ast.AssignStmt)
+	code := ""
+	code += handleAssignStmtExpr(a.Lhs)
+	code += a.Tok.String()
+	code += handleAssignStmtExpr(a.Rhs)
+	return code
+}
+
+func handleAssignStmtExpr(expr []ast.Expr) string {
+	code := ""
+	ops := make([]string, 0)
+	for _, op := range expr {
+		switch o := op.(type) {
+		case *ast.BasicLit:
+			ops = append(ops, handleBasicLit(o))
+		case *ast.BinaryExpr:
+			ops = append(ops, handleBinaryExpr(o))
+		case *ast.CallExpr:
+			ops = append(ops, handleCallExpr(o))
+		case *ast.Ident:
+			ops = append(ops, handleIdent(o))
+		}
+	}
+	code += strings.Join(ops, ",")
+	return code
+}
+
+func handleBasicLit(expr ast.Expr) string {
+	bl := expr.(*ast.BasicLit)
+	code := ""
+	code += bl.Value
+	return code
+}
+
+func handleBinaryExpr(expr ast.Expr) string {
+	e := expr.(*ast.BinaryExpr)
+	code := ""
+	switch x := e.X.(type) {
+	case *ast.Ident:
+		code += handleIdent(x)
+	}
+	code += e.Op.String()
+	switch y := e.Y.(type) {
+	case *ast.Ident:
+		code += handleIdent(y)
+	}
+	return code
+}
+
+func handleCallExpr(expr *ast.CallExpr) string {
+	code := ""
+	switch e := expr.Fun.(type) {
+	case *ast.Ident:
+		code += handleIdent(e)
+	case *ast.SelectorExpr:
+		code += handleSelectorExpr(e)
+	}
+	code += "("
+	args := make([]string, 0)
+	for _, arg := range expr.Args {
+		switch a := arg.(type) {
+		case *ast.BasicLit:
+			args = append(args, handleBasicLit(a))
+		case *ast.CallExpr:
+			args = append(args, handleCallExpr(a))
+		case *ast.SelectorExpr:
+			args = append(args, handleSelectorExpr(a))
+		}
+	}
+	code += strings.Join(args, ",")
+	code += ")"
+	return code
+}
+
+func handleDecl(id int, decl ast.Decl, dst chan<- string, done chan<- bool) {
+	code := ""
+	switch d := decl.(type) {
+	case *ast.FuncDecl:
+		code += handleFuncDecl(d)
+	case *ast.GenDecl:
+		code += handleGenDecl(d)
+	}
+	dst <- code
+	close(dst)
+	done <- true
+}
+
+func handleDeclStmt(stmt *ast.DeclStmt) string {
+	code := ""
+	switch decl := stmt.Decl.(type) {
+	case *ast.GenDecl:
+		code += handleGenDecl(decl)
+	}
+	return code
+}
+
+func handleExprStmt(stmt *ast.ExprStmt) string {
+	code := ""
+	switch x := stmt.X.(type) {
+	case *ast.CallExpr:
+		code += handleCallExpr(x)
+	}
+	return code
+}
+
+func handleFuncDecl(decl ast.Decl) string {
+	fd := decl.(*ast.FuncDecl)
+	code := ""
+	name := ""
+	code += handleFuncDeclType(fd.Type)
+	code += " "
+	name = handleFuncDeclName(fd.Name)
+	if name == "NewController" {
+		return ""
+	}
+	code += name
+	code += "("
+	code += handleFuncDeclParams(fd.Type)
+	code += ") {"
+	code += handleFuncDeclBody(fd.Body)
+	code += "}"
+	return code
+}
+
+func handleFuncDeclParams(t *ast.FuncType) string {
+	code := ""
+	if t.Params == nil || t.Params.List == nil {
+		return code
+	}
+	values := make([]string, 0)
+	for _, field := range t.Params.List {
+		ftype := ""
+		switch ft := field.Type.(type) {
+		case *ast.Ident:
+			ftype = handleIdent(ft)
+		}
+		for _, names := range field.Names {
+			values = append(values, ftype+" "+names.Name)
+		}
+	}
+	code += strings.Join(values, ",")
+	return code
+}
+
+func handleFuncDeclBody(body *ast.BlockStmt) string {
+	code := ""
+	if body == nil {
+		return code
+	}
+	for _, stmt := range body.List {
+		switch s := stmt.(type) {
+		case *ast.AssignStmt:
+			code += handleAssignStmt(s)
+			code += ";"
+		case *ast.DeclStmt:
+			code += handleDeclStmt(s)
+		case *ast.ExprStmt:
+			code += handleExprStmt(s)
+			code += ";"
+		}
+	}
+	return code
+}
+
+func handleFuncDeclName(ident *ast.Ident) string {
+	code := ""
+	if ident == nil {
+		return code
+	}
+	code += ident.Name
+	code = mapping.Apply(code)
+	return code
+}
+
+func handleFuncDeclType(t *ast.FuncType) string {
+	code := ""
+	if t.Results == nil {
+		code = "void"
+	}
+	return code
+}
+
+func handleGenDecl(decl ast.Decl) string {
+	gd := decl.(*ast.GenDecl)
+	code := ""
+	switch gd.Tok {
+	case token.CONST:
+		code += "const "
+	}
+	code += handleSpecs(gd.Specs)
+	return code
+}
+
+func handleIdent(expr ast.Expr) string {
+	ident := expr.(*ast.Ident)
+	code := ""
+	switch ident.Name {
+	case "string":
+		code += "char*"
+	default:
+		code += ident.Name
+	}
+	return code
+}
+
+func handleImportSpec(spec ast.Spec) string {
+	s := spec.(*ast.ImportSpec)
+	code := ""
+	if s.Name != nil {
+		name := handleIdent(s.Name)
+		name = mapping.Apply(name)
+		if name != "" {
+			if name != "controller" {
+				code = "#include <" + name + ".h>\n"
+			}
+		}
+	}
+	return code
+}
+
+func handleSelectorExpr(expr ast.Expr) string {
+	s := expr.(*ast.SelectorExpr)
+	code := ""
+	switch x := s.X.(type) {
+	case *ast.Ident:
+		code += handleIdent(x)
+	}
+	code += "."
+	code += handleIdent(s.Sel)
+	code = mapping.Apply(code)
+	return code
+}
+
+func handleSpecs(specs []ast.Spec) string {
+	code := ""
+	for _, spec := range specs {
+		switch spec.(type) {
+		case *ast.ImportSpec:
+			code += handleImportSpec(spec)
+		case *ast.ValueSpec:
+			code += handleValueSpec(spec) + ";"
+		}
+	}
+	return code
+}
+
+func handleValueSpec(spec ast.Spec) string {
+	s := spec.(*ast.ValueSpec)
+	code := ""
+	code += handleValueSpecType(s.Type)
+	code += " "
+	code += handleValueSpecNames(s.Names)
+	code += " = "
+	code += handleValueSpecValues(s.Values)
+	return code
+}
+
+func handleValueSpecNames(names []*ast.Ident) string {
+	code := ""
+	for _, name := range names {
+		code += handleIdent(name)
+	}
+	return code
+}
+
+func handleValueSpecType(expr ast.Expr) string {
+	code := ""
+	switch t := expr.(type) {
+	case *ast.Ident:
+		code += handleIdent(t)
+	}
+	return code
+}
+
+func handleValueSpecValues(values []ast.Expr) string {
+	code := ""
+	for _, value := range values {
+		switch v := value.(type) {
+		case *ast.BasicLit:
+			code += handleBasicLit(v)
+		}
+	}
+	return code
+}

infrastructure/ino/worker_test.go

@@ -0,0 +1,247 @@
+package ino_test
+
+import (
+	"bytes"
+	. "github.com/andygeiss/assert"
+	"github.com/andygeiss/esp32-transpiler/infrastructure/ino"
+	"strings"
+	"testing"
+)
+
+// Trim removes all the whitespaces and returns a new string.
+func Trim(s string) string {
+	s = strings.Replace(s, " ", "", -1)
+	s = strings.Replace(s, "\n", "", -1)
+	s = strings.Replace(s, "\r", "", -1)
+	s = strings.Replace(s, "\t", "", -1)
+	return s
+}
+
+// Validate the content of a given source with an expected outcome by using a string compare.
+// The Worker will be started and used to transform the source into an Arduino sketch format.
+func Validate(source, expected string, t *testing.T) {
+	var in, out bytes.Buffer
+	mapping := ino.NewMapping("mapping.json")
+	Assert(t, mapping.Read(), IsNil())
+	in.WriteString(source)
+	worker := ino.NewWorker(&in, &out, mapping)
+	Assert(t, worker.Start(), IsNil())
+	code := out.String()
+	tcode, texpected := Trim(code), Trim(expected)
+	Assert(t, tcode, IsEqual(texpected))
+}
+
+func TestEmptyPackage(t *testing.T) {
+	source := `package test`
+	expected := `void loop(){}
+	void setup() {}	`
+	Validate(source, expected, t)
+}
+
+func TestFunctionDeclaration(t *testing.T) {
+	source := `package test
+	func foo() {}
+	func bar() {}
+	`
+	expected := `void foo(){}
+	void bar() {}	`
+	Validate(source, expected, t)
+}
+func TestFunctionDeclarationWithArgs(t *testing.T) {
+	source := `package test
+	func foo(x int) {}
+	func bar(y int) {}
+	`
+	expected := `void foo(int x){}
+	void bar(int y) {}	`
+	Validate(source, expected, t)
+}
+func TestConstStringDeclaration(t *testing.T) {
+	source := `package test
+	const foo string = "bar"
+	`
+	expected := `
+	const char* foo = "bar";
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithConstStringDeclaration(t *testing.T) {
+	source := `package test
+	func foo() {
+		const foo string = "bar"
+	}
+	`
+	expected := `
+	void foo() {
+		const char* foo = "bar";
+	}
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithVarStringDeclaration(t *testing.T) {
+	source := `package test
+	func foo() {
+		var foo string = "bar"
+	}
+	`
+	expected := `
+	void foo() {
+		char* foo = "bar";
+	}
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithFunctionCall(t *testing.T) {
+	source := `package test
+	func foo() {
+		bar()
+	}
+	`
+	expected := `
+	void foo() {
+		bar();
+	}
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithFunctionCallWithArgs(t *testing.T) {
+	source := `package test
+	func foo() {
+		bar(1,2,3)
+	}
+	`
+	expected := `
+	void foo() {
+		bar(1,2,3);
+	}
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithFunctionCallWithString(t *testing.T) {
+	source := `package test
+	func foo() {
+		bar("foo")
+	}
+	`
+	expected := `
+	void foo() {
+		bar("foo");
+	}
+	`
+	Validate(source, expected, t)
+}
+
+func TestFunctionWithPackageFunctionCall(t *testing.T) {
+	source := `package test
+	func foo() {
+		foo.Bar(1,"2")
+	}
+	`
+	expected := `
+	void foo() {
+		foo.Bar(1,"2");
+	}
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithAssignments(t *testing.T) {
+	source := `package test
+	func foo() {
+		x = 1
+		y = 2
+		z = x + y
+	}
+	`
+	expected := `
+	void foo() {
+		x = 1;
+		y = 2;
+		z = x + y;
+	}
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithPackageSelectorAssignments(t *testing.T) {
+	source := `package test
+	func foo() {
+		x = bar()
+		y = pkg.Bar()
+		z = x + y
+	}
+	`
+	expected := `
+	void foo() {
+		x = bar();
+		y = pkg.Bar();
+		z = x + y;
+	}
+	`
+	Validate(source, expected, t)
+}
+
+func TestFunctionIdentMapping(t *testing.T) {
+	source := `package test
+	func foo() {
+		serial.Begin()
+	}
+	`
+	expected := `
+	void foo() {
+		Serial.begin();
+	}
+	`
+	Validate(source, expected, t)
+}
+func TestFunctionWithIdentParam(t *testing.T) {
+	source := `package test
+	func foo() {
+		foo.Bar(1,"2",digital.Low)
+	}
+	`
+	expected := `
+	void foo() {
+		foo.Bar(1,"2",LOW);
+	}
+	`
+	Validate(source, expected, t)
+}
+
+func TestFunctionWithFunctionParam(t *testing.T) {
+	source := `package test
+	func foo() {
+		serial.Println(wifi.LocalIP())
+	}
+	`
+	expected := `
+	void foo() {
+		Serial.println(WiFi.localIP());
+	}
+	`
+	Validate(source, expected, t)
+}
+
+func TestPackageImport(t *testing.T) {
+	source := `package test
+	import "github.com/andygeiss/esp32-mqtt/business/controller"
+	import "github.com/andygeiss/esp32-mqtt/business/controller/serial"
+	import "github.com/andygeiss/esp32/business/controller/timer"
+	import wifi "github.com/andygeiss/esp32/business/controller/wifi"
+	`
+	expected := `
+	#include <WiFi.h>
+	`
+	Validate(source, expected, t)
+}
+
+func TestPackageImport_ButIgnoreController(t *testing.T) {
+	source := `package test
+	import controller "github.com/andygeiss/esp32-controller"
+	import "github.com/andygeiss/esp32-mqtt/business/controller/serial"
+	import "github.com/andygeiss/esp32/business/controller/timer"
+	import wifi "github.com/andygeiss/esp32/business/controller/wifi"
+	`
+	expected := `
+	#include <WiFi.h>
+	`
+	Validate(source, expected, t)
+}

platform/main/main.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"github.com/andygeiss/esp32-transpiler/application/transpile"
+	"github.com/andygeiss/esp32-transpiler/infrastructure/ino"
+	"github.com/andygeiss/log"
+	"os"
+)
+
+func main() {
+	mapping, source, target := getFlags()
+	checkFlagsAreValid(mapping, source, target)
+	safeTranspile(mapping, source, target)
+}
+
+func checkFlagsAreValid(mapping, source, target string) {
+	if mapping == "" || source == "" || target == "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+}
+
+func getFlags() (string, string, string) {
+	mapping := flag.String("mapping", fmt.Sprintf("%s/esp32/mapping.json", os.Getenv("HOME")), "API Mapping file")
+	source := flag.String("source", "", "Golang source file")
+	target := flag.String("target", "", "Arduino sketch file")
+	flag.Parse()
+	return *mapping, *source, *target
+}
+
+func printUsage() {
+	fmt.Print("This program transpiles Golang source into corresponding Arduino sketches.\n\n")
+	fmt.Print("Options:\n")
+	flag.PrintDefaults()
+	fmt.Print("\n")
+	fmt.Print("Example:\n")
+	fmt.Printf("\tesp32 -source application/blink/controller.go -target application/blink/controller.ino\n\n")
+}
+
+func safeTranspile(mapping, source, target string) {
+	// Read the Golang source file.
+	in, err := os.Open(source)
+	if err != nil {
+		log.Fatal("Go source file [%s] could not be opened! %v", source, err)
+	}
+	defer in.Close()
+	// Create the Arduino sketch file.
+	os.Remove(target)
+	out, err := os.OpenFile(target, os.O_CREATE|os.O_RDWR|os.O_SYNC, 0666)
+	if err != nil {
+		log.Fatal("Arduino sketch file [%s] could not be opened! %v", target, err)
+	}
+	// Transpiles the Golang source into Arduino sketch.
+	m := ino.NewMapping(mapping)
+	if err := m.Read(); err != nil {
+		log.Fatal("%v", err)
+	}
+	worker := ino.NewWorker(in, out, m)
+	trans := transpile.NewTranspiler(worker)
+	if err := trans.Transpile(); err != nil {
+		log.Fatal("%v", err)
+	}
+}