lint.lua revision 1.3 
1#! /usr/bin/lua
2-- $NetBSD: lint.lua,v 1.3 2021/06/13 18:11:44 rillig Exp $
3
4--[[
5
6usage: lua ./lint.lua
7
8Check that the boilerplate code does not contain unintended
9inconsistencies.
10
11]]
12
13---@return string[]
14local function load_lines(fname)
15  local lines = {}
16
17  local f = assert(io.open(fname, "r"))
18  for line in f:lines() do
19    table.insert(lines, line)
20  end
21
22  f:close()
23
24  return lines
25end
26
27
28local function new_errors()
29  local errors = {}
30  errors.add = function(self, fmt, ...)
31    table.insert(self, string.format(fmt, ...))
32  end
33  errors.print = function(self)
34    for _, msg in ipairs(self) do
35      print(msg)
36    end
37  end
38  return errors
39end
40
41
42local function num(s)
43  if s == nil then return nil end
44  return tonumber(s)
45end
46
47
48-- After each macro ARGC, there must be the corresponding macros for ARG.
49local function check_args(errors)
50  local fname = "curses_commands.c"
51  local lines = load_lines(fname)
52  local argi, argc
53
54  for lineno, line in ipairs(lines) do
55
56    local c = num(line:match("^\tARGC%((%d)"))
57    if c and c > 0 then
58      argc, argi = c, 0
59    end
60
61    local arg = line:match("^\tARG_[%w_]+%(")
62    if arg and not argi then
63      errors:add("%s:%d: ARG without preceding ARGC", fname, lineno)
64    end
65
66    if not arg and argi and not c then
67      errors:add("%s:%d: expecting ARG %d, got %s", fname, lineno, argi, line)
68      argc, argi = nil, nil
69    end
70
71    if arg and argi then
72      argi = argi + 1
73      if argi == argc then
74        argc, argi = nil, nil
75      end
76    end
77  end
78end
79
80
81local function main(arg)
82  local errors = new_errors()
83  check_args(errors)
84  errors:print()
85  return #errors == 0
86end
87
88
89os.exit(main(arg))
90