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--[[
The upb compiler. Unlike the proto2 compiler, this does
not output any parsing code or generated classes or anything
specific to the protobuf binary format at all. At the moment
it only dumps C initializers for upb_defs, so that a .proto
file can be represented in a .o file.
--]]
local dump_cinit = require "dump_cinit"
local upb = require "upb"
local src = arg[1]
if not src then
print("Usage: upbc <binary descriptor>")
return 1
end
function strip_proto(filename)
return string.gsub(filename, '%.proto$','')
end
-- Open input/output files.
local f = assert(io.open(src, "r"), "couldn't open input file " .. src)
local descriptor = f:read("*all")
local files = upb.load_descriptor(descriptor)
local symtab = upb.SymbolTable()
for _, file in ipairs(files) do
symtab:add_file(file)
local outbase = strip_proto(file:name())
local hfilename = outbase .. ".upbdefs.h"
local cfilename = outbase .. ".upbdefs.c"
if os.getenv("UPBC_VERBOSE") then
print("upbc:")
print(string.format(" source file=%s", src))
print(string.format(" output file base=%s", outbase))
print(string.format(" hfilename=%s", hfilename))
print(string.format(" cfilename=%s", cfilename))
end
os.execute(string.format("mkdir -p `dirname %s`", outbase))
local hfile = assert(io.open(hfilename, "w"), "couldn't open " .. hfilename)
local cfile = assert(io.open(cfilename, "w"), "couldn't open " .. cfilename)
local happend = dump_cinit.file_appender(hfile)
local cappend = dump_cinit.file_appender(cfile)
-- Dump defs
dump_cinit.dump_defs(file, happend, cappend)
hfile:close()
cfile:close()
end
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