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32b6122460
Except for the `Error *` type, all parameter types are valid identifiers, so reuse that LPeg rule.
221 lines
6.8 KiB
Lua
221 lines
6.8 KiB
Lua
lpeg = require('lpeg')
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msgpack = require('cmsgpack')
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-- lpeg grammar for building api metadata from a set of header files. It
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-- ignores comments and preprocessor commands and parses a very small subset
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-- of C prototypes with a limited set of types
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P, R, S = lpeg.P, lpeg.R, lpeg.S
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C, Ct, Cc, Cg = lpeg.C, lpeg.Ct, lpeg.Cc, lpeg.Cg
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any = P(1) -- (consume one character)
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letter = R('az', 'AZ') + S('_$')
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alpha = letter + R('09')
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nl = P('\n')
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not_nl = any - nl
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ws = S(' \t') + nl
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fill = ws ^ 0
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c_comment = P('//') * (not_nl ^ 0)
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c_preproc = P('#') * (not_nl ^ 0)
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c_id = letter * (alpha ^ 0)
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c_void = P('void')
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c_param_type = (
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((P('Error') * fill * P('*') * fill) * Cc('error')) +
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(C(c_id) * (ws ^ 1))
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)
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c_type = (C(c_void) * (ws ^ 1)) + c_param_type
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c_param = Ct(c_param_type * C(c_id))
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c_param_list = c_param * (fill * (P(',') * fill * c_param) ^ 0)
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c_params = Ct(c_void + c_param_list)
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c_proto = Ct(
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Cg(c_type, 'return_type') * Cg(c_id, 'name') *
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fill * P('(') * fill * Cg(c_params, 'parameters') * fill * P(')') *
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fill * P(';')
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)
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grammar = Ct((c_proto + c_comment + c_preproc + ws) ^ 1)
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-- we need at least 2 arguments since the last one is the output file
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assert(#arg >= 1)
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-- api metadata
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api = {
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functions = {},
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-- Helpers for object-oriented languages
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classes = {'Buffer', 'Window', 'Tabpage'}
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}
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-- names of all headers relative to the source root(for inclusion in the
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-- generated file)
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headers = {}
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-- output file(dispatch function + metadata serialized with msgpack)
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outputf = arg[#arg]
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-- read each input file, parse and append to the api metadata
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for i = 1, #arg - 1 do
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local full_path = arg[i]
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local parts = {}
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for part in string.gmatch(full_path, '[^/]+') do
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parts[#parts + 1] = part
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end
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headers[#headers + 1] = parts[#parts - 1]..'/'..parts[#parts]
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local input = io.open(full_path, 'rb')
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local tmp = grammar:match(input:read('*all'))
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for i = 1, #tmp do
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api.functions[#api.functions + 1] = tmp[i]
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local fn_id = #api.functions
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local fn = api.functions[fn_id]
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if #fn.parameters ~= 0 and fn.parameters[#fn.parameters][1] == 'error' then
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-- function can fail if the last parameter type is 'Error'
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fn.can_fail = true
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-- remove the error parameter, msgpack has it's own special field
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-- for specifying errors
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fn.parameters[#fn.parameters] = nil
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end
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-- assign a unique integer id for each api function
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fn.id = fn_id
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end
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input:close()
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end
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-- start building the output
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output = io.open(outputf, 'wb')
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output:write([[
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#include <stdbool.h>
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#include <stdint.h>
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#include <msgpack.h>
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#include "nvim/os/msgpack_rpc.h"
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]])
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for i = 1, #headers do
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output:write('\n#include "nvim/'..headers[i]..'"')
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end
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output:write([[
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static const uint8_t msgpack_metadata[] = {
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]])
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-- serialize the API metadata using msgpack and embed into the resulting
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-- binary for easy querying by clients
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packed = msgpack.pack(api)
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for i = 1, #packed do
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output:write(string.byte(packed, i)..', ')
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if i % 10 == 0 then
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output:write('\n ')
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end
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end
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-- start the dispatch function. number 0 is reserved for querying the metadata,
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-- usually it is the first function called by clients.
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output:write([[
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};
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void msgpack_rpc_dispatch(msgpack_object *req, msgpack_packer *res)
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{
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Error error = { .set = false };
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uint64_t method_id = (uint32_t)req->via.array.ptr[2].via.u64;
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switch (method_id) {
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case 0:
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msgpack_pack_nil(res);
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// The result is the `msgpack_metadata` byte array
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msgpack_pack_raw(res, sizeof(msgpack_metadata));
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msgpack_pack_raw_body(res, msgpack_metadata, sizeof(msgpack_metadata));
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return;
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]])
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-- Visit each function metadata to build the case label with code generated
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-- for validating arguments and calling to the real API
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for i = 1, #api.functions do
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local fn = api.functions[i]
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local args = {}
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local cleanup_label = 'cleanup_'..i
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output:write('\n case '..fn.id..': {')
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output:write('\n if (req->via.array.ptr[3].via.array.size != '..#fn.parameters..') {')
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output:write('\n snprintf(error.msg, sizeof(error.msg), "Wrong number of arguments: expecting '..#fn.parameters..' but got %u", req->via.array.ptr[3].via.array.size);')
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output:write('\n msgpack_rpc_error(error.msg, res);')
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output:write('\n goto '..cleanup_label..';')
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output:write('\n }\n')
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-- Declare/initialize variables that will hold converted arguments
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for j = 1, #fn.parameters do
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local param = fn.parameters[j]
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local converted = 'arg_'..j
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output:write('\n '..param[1]..' '..converted..' msgpack_rpc_init_'..string.lower(param[1])..';')
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end
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output:write('\n')
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-- Validation/conversion for each argument
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for j = 1, #fn.parameters do
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local converted, convert_arg, param, arg
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param = fn.parameters[j]
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arg = '(req->via.array.ptr[3].via.array.ptr + '..(j - 1)..')'
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converted = 'arg_'..j
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convert_arg = 'msgpack_rpc_to_'..string.lower(param[1])
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output:write('\n if (!'..convert_arg..'('..arg..', &'..converted..')) {')
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output:write('\n msgpack_rpc_error("Wrong type for argument '..j..', expecting '..param[1]..'", res);')
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output:write('\n goto '..cleanup_label..';')
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output:write('\n }\n')
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args[#args + 1] = converted
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end
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-- function call
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local call_args = table.concat(args, ', ')
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output:write('\n ')
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if fn.return_type ~= 'void' then
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-- has a return value, prefix the call with a declaration
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output:write(fn.return_type..' rv = ')
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end
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-- write the call without the closing parenthesis
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output:write(fn.name..'('..call_args)
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if fn.can_fail then
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-- if the function can fail, also pass a pointer to the local error object
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if #args > 0 then
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output:write(', &error);\n')
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else
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output:write('&error);\n')
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end
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-- and check for the error
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output:write('\n if (error.set) {')
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output:write('\n msgpack_rpc_error(error.msg, res);')
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output:write('\n goto '..cleanup_label..';')
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output:write('\n }\n')
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else
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output:write(');\n')
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end
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-- nil error
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output:write('\n msgpack_pack_nil(res);');
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if fn.return_type == 'void' then
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output:write('\n msgpack_pack_nil(res);');
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else
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output:write('\n msgpack_rpc_from_'..string.lower(fn.return_type)..'(rv, res);')
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-- free the return value
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output:write('\n msgpack_rpc_free_'..string.lower(fn.return_type)..'(rv);')
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end
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-- Now generate the cleanup label for freeing memory allocated for the
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-- arguments
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output:write('\n\n'..cleanup_label..':');
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for j = 1, #fn.parameters do
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local param = fn.parameters[j]
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output:write('\n msgpack_rpc_free_'..string.lower(param[1])..'(arg_'..j..');')
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end
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output:write('\n return;');
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output:write('\n };\n');
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end
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output:write([[
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default:
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msgpack_rpc_error("Invalid function id", res);
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}
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}
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]])
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output:close()
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