forked from BigfootDev/flatbuffers
ba5eb3b5cf
* 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
97 lines
2.3 KiB
Lua
97 lines
2.3 KiB
Lua
local m = {}
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local mt = {}
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local mt_name = "flatbuffers.view.mt"
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local N = require("flatbuffers.numTypes")
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local binaryarray = require("flatbuffers.binaryarray")
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function m.New(buf, pos)
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N.UOffsetT:EnforceNumber(pos)
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-- need to convert from a string buffer into
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-- a binary array
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local o = {
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bytes = type(buf) == "string" and binaryarray.New(buf) or buf,
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pos = pos
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}
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setmetatable(o, {__index = mt, __metatable = mt_name})
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return o
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end
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function mt:Offset(vtableOffset)
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local vtable = self.pos - self:Get(N.SOffsetT, self.pos)
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local vtableEnd = self:Get(N.VOffsetT, vtable)
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if vtableOffset < vtableEnd then
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return self:Get(N.VOffsetT, vtable + vtableOffset)
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end
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return 0
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end
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function mt:Indirect(off)
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N.UOffsetT:EnforceNumber(off)
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return off + N.UOffsetT:Unpack(self.bytes, off)
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end
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function mt:String(off)
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N.UOffsetT:EnforceNumber(off)
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off = off + N.UOffsetT:Unpack(self.bytes, off)
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local start = off + N.UOffsetT.bytewidth
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local length = N.UOffsetT:Unpack(self.bytes, off)
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return self.bytes:Slice(start, start+length)
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end
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function mt:VectorLen(off)
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N.UOffsetT:EnforceNumber(off)
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off = off + self.pos
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off = off + N.UOffsetT:Unpack(self.bytes, off)
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return N.UOffsetT:Unpack(self.bytes, off)
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end
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function mt:Vector(off)
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N.UOffsetT:EnforceNumber(off)
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off = off + self.pos
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local x = off + self:Get(N.UOffsetT, off)
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x = x + N.UOffsetT.bytewidth
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return x
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end
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function mt:Union(t2, off)
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assert(getmetatable(t2) == mt_name)
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N.UOffsetT:EnforceNumber(off)
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off = off + self.pos
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t2.pos = off + self:Get(N.UOffsetT, off)
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t2.bytes = self.bytes
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end
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function mt:Get(flags, off)
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N.UOffsetT:EnforceNumber(off)
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return flags:Unpack(self.bytes, off)
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end
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function mt:GetSlot(slot, d, validatorFlags)
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N.VOffsetT:EnforceNumber(slot)
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if validatorFlags then
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validatorFlags:EnforceNumber(d)
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end
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local off = self:Offset(slot)
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if off == 0 then
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return d
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end
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return self:Get(validatorFlags, self.pos + off)
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end
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function mt:GetVOffsetTSlot(slot, d)
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N.VOffsetT:EnforceNumber(slot)
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N.VOffsetT:EnforceNumber(d)
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local off = self:Offset(slot)
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if off == 0 then
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return d
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end
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return off
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end
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return m |