Lua (5.3) Language addition (#4804)

* starting Lua port of python implmention. Syncing commit

* Bulk of Lua module port from Python done. Not tested, only static analysis. Need to work on binary strings. Started work on flatc lua code generation

* Fixed all the basic errors to produced a binary output from the builder, don't know if it is generated correctly, but it contains data, so that must be good

* fixed binary set command that was extending the array improperly

* continued improvement

* Moved lua submodules down a directory so their names don't clash with potential other modules. Added compat module to provide Lua versioning logic

* Successful sample port from Python

* working on testing Lua code with formal tests

* continued to work on tests and fixes to code to make tests pass

* Added reading buffer test

* Changed binaryarray implmentation to use a temporary table for storing data, and then serialize it to a string when requested. This double the rate of building flatbuffers compared to the string approach.

* Didn't need encode module as it just added another layer of indirection that isn't need

* profiled reading buffers, optimizations to increase read performance of monster data to ~7 monster / millisecond

* Writing profiler improvments. Get about
~2 monsters/millisecond building rate

* removed Numpy generation from Lua (came from the Python port)

* math.pow is deprecated in Lua 5.3, so changed to ^ notation. Also added .bat script for starting Lua tests

* adding results of generate_code.bat

* simple edits for code review in PR.

* There was a buffer overflow in inserting the keywords into the unorder set for both the Lua and Python code gens. Changed insertion to use iterators.

* fixed spacing issue

* basic documenation/tutorial updates. Updated sample_binary.lua to reflect the tutorial better

* removed windows-specific build step in Lua tests

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/MyGame/Example/Test.lua b/tests/MyGame/Example/Test.lua
new file mode 100644
index 00000000..154067bf
--- /dev/null
+++ b/tests/MyGame/Example/Test.lua
@@ -0,0 +1,32 @@
+-- automatically generated by the FlatBuffers compiler, do not modify
+
+-- namespace: Example
+
+local flatbuffers = require('flatbuffers')
+
+local Test = {} -- the module
+local Test_mt = {} -- the class metatable
+
+function Test.New()
+    local o = {}
+    setmetatable(o, {__index = Test_mt})
+    return o
+end
+function Test_mt:Init(buf, pos)
+    self.view = flatbuffers.view.New(buf, pos)
+end
+function Test_mt:A()
+    return self.view:Get(flatbuffers.N.Int16, self.view.pos + 0)
+end
+function Test_mt:B()
+    return self.view:Get(flatbuffers.N.Int8, self.view.pos + 2)
+end
+function Test.CreateTest(builder, a, b)
+    builder:Prep(2, 4)
+    builder:Pad(1)
+    builder:PrependInt8(b)
+    builder:PrependInt16(a)
+    return builder:Offset()
+end
+
+return Test -- return the module
\ No newline at end of file