path: root/nomsu.lua

local lpeg = require('lpeg')
local re = require('re')
lpeg.setmaxstack(10000)
local P, R, V, S, Cg, C, Cp, B, Cmt, Carg
P, R, V, S, Cg, C, Cp, B, Cmt, Carg = lpeg.P, lpeg.R, lpeg.V, lpeg.S, lpeg.Cg, lpeg.C, lpeg.Cp, lpeg.B, lpeg.Cmt, lpeg.Carg
local utils = require('utils')
local repr, stringify, min, max, equivalent, set, is_list, sum
repr, stringify, min, max, equivalent, set, is_list, sum = utils.repr, utils.stringify, utils.min, utils.max, utils.equivalent, utils.set, utils.is_list, utils.sum
local colors = setmetatable({ }, {
  __index = function()
    return ""
  end
})
colored = setmetatable({ }, {
  __index = function(_, color)
    return (function(msg)
      return colors[color] .. tostring(msg or '') .. colors.reset
    end)
  end
})
local insert, remove, concat
do
  local _obj_0 = table
  insert, remove, concat = _obj_0.insert, _obj_0.remove, _obj_0.concat
end
local unpack = unpack or table.unpack
local match, sub, rep, gsub, format, byte, find
do
  local _obj_0 = string
  match, sub, rep, gsub, format, byte, match, find = _obj_0.match, _obj_0.sub, _obj_0.rep, _obj_0.gsub, _obj_0.format, _obj_0.byte, _obj_0.match, _obj_0.find
end
local debug_getinfo = debug.getinfo
local NomsuCode, LuaCode, Source
do
  local _obj_0 = require("code_obj")
  NomsuCode, LuaCode, Source = _obj_0.NomsuCode, _obj_0.LuaCode, _obj_0.Source
end
local STDIN, STDOUT, STDERR = "/dev/fd/0", "/dev/fd/1", "/dev/fd/2"
string.as_lua_id = function(str)
  local argnum = 0
  str = gsub(str, "x([0-9A-F][0-9A-F])", "x\0%1")
  str = gsub(str, "%W", function(c)
    if c == ' ' then
      return '_'
    elseif c == '%' then
      argnum = argnum + 1
      return tostring(argnum)
    else
      return format("x%02X", byte(c))
    end
  end)
  return '_' .. str
end
table.map = function(self, fn)
  local _accum_0 = { }
  local _len_0 = 1
  for _, v in ipairs(self) do
    _accum_0[_len_0] = fn(v)
    _len_0 = _len_0 + 1
  end
  return _accum_0
end
FILE_CACHE = setmetatable({ }, {
  __index = function(self, filename)
    local file = io.open(filename)
    if not (file) then
      return nil
    end
    local contents = file:read("*a")
    file:close()
    self[filename] = contents
    return contents
  end
})
local iterate_single
iterate_single = function(item, prev)
  if item == prev then
    return nil
  else
    return item
  end
end
local all_files
all_files = function(path)
  if match(path, "%.nom$") or match(path, "%.lua$") or match(path, "^/dev/fd/[012]$") then
    return iterate_single, path
  end
  path = gsub(path, "\\", "\\\\")
  path = gsub(path, "`", "")
  path = gsub(path, '"', '\\"')
  path = gsub(path, "$", "")
  return coroutine.wrap(function()
    local f = io.popen('find -L "' .. path .. '" -not -path "*/\\.*" -type f -name "*.nom"')
    for line in f:lines() do
      coroutine.yield(line)
    end
    local success = f:close()
    if not (success) then
      return error("Invalid file path: " .. tostring(path))
    end
  end)
end
local line_counter = re.compile([[    lines <- {| line (%nl line)* |}
    line <- {} (!%nl .)*
]], {
  nl = P("\r") ^ -1 * P("\n")
})
local get_lines = re.compile([[    lines <- {| line (%nl line)* |}
    line <- {[^%nl]*}
]], {
  nl = P("\r") ^ -1 * P("\n")
})
LINE_STARTS = setmetatable({ }, {
  __mode = "k",
  __index = function(self, k)
    if type(k) ~= 'string' then
      k = tostring(k)
      do
        local v = rawget(self, k)
        if v then
          return v
        end
      end
    end
    local line_starts = line_counter:match(k)
    self[k] = line_starts
    return line_starts
  end
})
local pos_to_line
pos_to_line = function(str, pos)
  local line_starts = LINE_STARTS[str]
  local lo, hi = 1, #line_starts
  while lo <= hi do
    local mid = math.floor((lo + hi) / 2)
    if line_starts[mid] > pos then
      hi = mid - 1
    else
      lo = mid + 1
    end
  end
  return hi
end
do
  local STRING_METATABLE = getmetatable("")
  STRING_METATABLE.__add = function(self, other)
    return self .. stringify(other)
  end
  STRING_METATABLE.__index = function(self, i)
    local ret = string[i]
    if ret ~= nil then
      return ret
    end
    if type(i) == 'number' then
      return sub(self, i, i)
    elseif type(i) == 'table' then
      return sub(self, i[1], i[2])
    end
  end
end
local AST = require("nomsu_tree")
local _list_mt = {
  __eq = utils.equivalent,
  __tostring = function(self)
    return "[" .. concat((function()
      local _accum_0 = { }
      local _len_0 = 1
      for _index_0 = 1, #self do
        local b = self[_index_0]
        _accum_0[_len_0] = repr(b)
        _len_0 = _len_0 + 1
      end
      return _accum_0
    end)(), ", ") .. "]"
  end
}
local list
list = function(t)
  return setmetatable(t, _list_mt)
end
local _dict_mt = {
  __eq = utils.equivalent,
  __tostring = function(self)
    return "{" .. concat((function()
      local _accum_0 = { }
      local _len_0 = 1
      for k, v in pairs(self) do
        _accum_0[_len_0] = tostring(repr(k)) .. ": " .. tostring(repr(v))
        _len_0 = _len_0 + 1
      end
      return _accum_0
    end)(), ", ") .. "}"
  end
}
local dict
dict = function(t)
  return setmetatable(t, _dict_mt)
end
local MAX_LINE = 80
local NomsuCompiler = setmetatable({ }, {
  __index = function(self, k)
    do
      local _self = rawget(self, "self")
      if _self then
        return _self[k]
      else
        return nil
      end
    end
  end
})
do
  NomsuCompiler._ENV = NomsuCompiler
  NomsuCompiler.nomsu = NomsuCompiler
  local parse = require("parser")
  NomsuCompiler.parse = function(self, ...)
    return parse(...)
  end
  NomsuCompiler.source_map = { }
  local to_add = {
    repr = repr,
    stringify = stringify,
    utils = utils,
    lpeg = lpeg,
    re = re,
    next = next,
    unpack = unpack,
    setmetatable = setmetatable,
    coroutine = coroutine,
    rawequal = rawequal,
    getmetatable = getmetatable,
    pcall = pcall,
    error = error,
    package = package,
    os = os,
    require = require,
    tonumber = tonumber,
    tostring = tostring,
    string = string,
    xpcall = xpcall,
    module = module,
    print = print,
    loadfile = loadfile,
    rawset = rawset,
    _VERSION = _VERSION,
    collectgarbage = collectgarbage,
    rawget = rawget,
    rawlen = rawlen,
    table = table,
    assert = assert,
    dofile = dofile,
    loadstring = loadstring,
    type = type,
    select = select,
    debug = debug,
    math = math,
    io = io,
    load = load,
    pairs = pairs,
    ipairs = ipairs,
    list = list,
    dict = dict
  }
  for k, v in pairs(to_add) do
    NomsuCompiler[k] = v
  end
  for k, v in pairs(AST) do
    NomsuCompiler[k] = v
  end
  NomsuCompiler.LuaCode = LuaCode
  NomsuCompiler.NomsuCode = NomsuCode
  NomsuCompiler.Source = Source
  NomsuCompiler.ARG_ORDERS = setmetatable({ }, {
    __mode = "k"
  })
  NomsuCompiler.ALIASES = setmetatable({ }, {
    __mode = "k"
  })
  NomsuCompiler.LOADED = { }
  NomsuCompiler.AST = AST
  NomsuCompiler.compile_error = function(self, tok, err_format_string, ...)
    local file = FILE_CACHE[tok.source.filename]
    local line_no = pos_to_line(file, tok.source.start)
    local line_start = LINE_STARTS[file][line_no]
    local src = colored.dim(file:sub(line_start, tok.source.start - 1))
    src = src .. colored.underscore(colored.bright(colored.red(file:sub(tok.source.start, tok.source.stop - 1))))
    local end_of_line = (LINE_STARTS[file][pos_to_line(file, tok.source.stop) + 1] or 0) - 1
    src = src .. colored.dim(file:sub(tok.source.stop, end_of_line - 1))
    src = '    ' .. src:gsub('\n', '\n    ')
    local err_msg = err_format_string:format(src, ...)
    return error(tostring(tok.source.filename) .. ":" .. tostring(line_no) .. ": " .. err_msg, 0)
  end
  local math_expression = re.compile([[ ([+-] " ")* "%" (" " [*/^+-] (" " [+-])* " %")+ !. ]])
  local add_lua_bits
  add_lua_bits = function(self, lua, code)
    for _index_0 = 1, #code do
      local bit = code[_index_0]
      if type(bit) == "string" then
        lua:append(bit)
      else
        local bit_lua = self:compile(bit)
        if not (bit_lua.is_value) then
          self:compile_error(bit, "Cannot use:\n%s\nas a string interpolation value, since it's not an expression.")
        end
        lua:append(bit_lua)
      end
    end
    return lua
  end
  local add_lua_string_bits
  add_lua_string_bits = function(self, lua, code)
    local line_len = 0
    if code.type ~= "Text" then
      lua:append(", ", self:compile(code))
      return 
    end
    for _index_0 = 1, #code do
      local bit = code[_index_0]
      local bit_lua
      if type(bit) == "string" then
        bit_lua = repr(bit)
      else
        bit_lua = self:compile(bit)
        if not (bit_lua.is_value) then
          self:compile_error(bit, "Cannot use:\n%s\nas a string interpolation value, since it's not an expression.")
        end
        bit_lua = bit_lua
      end
      line_len = line_len + #tostring(bit_lua)
      if line_len > MAX_LINE then
        lua:append(",\n    ")
        line_len = 4
      else
        lua:append(", ")
      end
      lua:append(bit_lua)
    end
  end
  NomsuCompiler.COMPILE_ACTIONS = setmetatable({
    compile_math_expr = function(self, tree, ...)
      local lua = LuaCode.Value(tree.source)
      for i, tok in ipairs(tree) do
        if type(tok) == 'string' then
          lua:append(tok)
        else
          local tok_lua = self:compile(tok)
          if not (tok_lua.is_value) then
            self:compile_error(tok, "Non-expression value inside math expression:\n%s")
          end
          if tok.type == "Action" then
            tok_lua:parenthesize()
          end
          lua:append(tok_lua)
        end
        if i < #tree then
          lua:append(" ")
        end
      end
      return lua
    end,
    ["Lua %"] = function(self, tree, _code)
      local lua = LuaCode.Value(_code.source, "LuaCode(", repr(tostring(_code.source)))
      add_lua_string_bits(self, lua, _code)
      lua:append(")")
      return lua
    end,
    ["Lua value %"] = function(self, tree, _code)
      local lua = LuaCode.Value(_code.source, "LuaCode.Value(", repr(tostring(_code.source)))
      add_lua_string_bits(self, lua, _code)
      lua:append(")")
      return lua
    end,
    ["lua > %"] = function(self, tree, _code)
      if _code.type ~= "Text" then
        return LuaCode(tree.source, "nomsu:run_lua(", self:compile(_code), ");")
      end
      return add_lua_bits(self, LuaCode(tree.source), _code)
    end,
    ["= lua %"] = function(self, tree, _code)
      if _code.type ~= "Text" then
        return LuaCode.Value(tree.source, "nomsu:run_lua(", self:compile(_code), ":as_statements('return '))")
      end
      return add_lua_bits(self, LuaCode.Value(tree.source), _code)
    end,
    ["use %"] = function(self, tree, _path)
      if not (_path.type == 'Text' and #_path == 1 and type(_path[1]) == 'string') then
        return LuaCode(tree.source, "nomsu:run_file(" .. tostring(self:compile(_path)) .. ");")
      end
      local path = _path[1]
      self:run_file(path)
      return LuaCode(tree.source, "nomsu:run_file(" .. tostring(repr(path)) .. ");")
    end
  }, {
    __index = function(self, stub)
      if math_expression:match(stub) then
        return self.compile_math_expr
      end
    end
  })
  NomsuCompiler.fork = function(self)
    return setmetatable({
      COMPILE_ACTIONS = setmetatable({ }, {
        __index = self.COMPILE_ACTIONS
      })
    }, {
      __index = self
    })
  end
  NomsuCompiler.run = function(self, to_run, source)
    if source == nil then
      source = nil
    end
    local tree
    if AST.is_syntax_tree(to_run) then
      tree = tree
    else
      tree = self:parse(to_run, source or to_run.source)
    end
    if tree == nil then
      return nil
    end
    if tree.type == "FileChunks" then
      local ret = nil
      local all_lua = { }
      for _index_0 = 1, #tree do
        local chunk = tree[_index_0]
        local lua = self:compile(chunk):as_statements()
        lua:declare_locals()
        lua:prepend("-- File: " .. tostring(chunk.source or "") .. "\n")
        insert(all_lua, tostring(lua))
        ret = self:run_lua(lua)
      end
      if self.on_compile then
        self.on_compile(concat(all_lua, "\n"), (source or to_run.source).filename)
      end
      return ret
    else
      local lua = self:compile(tree, compile_actions):as_statements()
      lua:declare_locals()
      lua:prepend("-- File: " .. tostring(source or to_run.source or "") .. "\n")
      if self.on_compile then
        self.on_compile(lua, (source or to_run.source).filename)
      end
      return self:run_lua(lua)
    end
  end
  local _running_files = { }
  NomsuCompiler.run_file = function(self, filename)
    if self.LOADED[filename] then
      return self.LOADED[filename]
    end
    local ret = nil
    for filename in all_files(filename) do
      local _continue_0 = false
      repeat
        if self.LOADED[filename] then
          ret = self.LOADED[filename]
          _continue_0 = true
          break
        end
        for i, running in ipairs(_running_files) do
          if running == filename then
            local loop
            do
              local _accum_0 = { }
              local _len_0 = 1
              for j = i, #_running_files do
                _accum_0[_len_0] = _running_files[j]
                _len_0 = _len_0 + 1
              end
              loop = _accum_0
            end
            insert(loop, filename)
            error("Circular import, this loops forever: " .. tostring(concat(loop, " -> ")))
          end
        end
        insert(_running_files, filename)
        if match(filename, "%.lua$") then
          local file = assert(FILE_CACHE[filename], "Could not find file: " .. tostring(filename))
          ret = self:run_lua(file, Source(filename, 1, #file))
        elseif match(filename, "%.nom$") or match(filename, "^/dev/fd/[012]$") then
          if not self.skip_precompiled then
            local lua_filename = gsub(filename, "%.nom$", ".lua")
            local file = FILE_CACHE[lua_filename]
            if file then
              ret = self:run_lua(file, Source(filename, 1, #file))
              remove(_running_files)
              _continue_0 = true
              break
            end
          end
          local file = file or FILE_CACHE[filename]
          if not file then
            error("File does not exist: " .. tostring(filename), 0)
          end
          ret = self:run(file, Source(filename, 1, #file))
        else
          error("Invalid filetype for " .. tostring(filename), 0)
        end
        self.LOADED[filename] = ret or true
        remove(_running_files)
        _continue_0 = true
      until true
      if not _continue_0 then
        break
      end
    end
    self.LOADED[filename] = ret or true
    return ret
  end
  NomsuCompiler.run_lua = function(self, lua, source)
    if source == nil then
      source = nil
    end
    local lua_string = tostring(lua)
    local run_lua_fn, err = load(lua_string, nil and tostring(source or lua.source), "t", self)
    if not run_lua_fn then
      local n = 1
      local fn
      fn = function()
        n = n + 1
        return ("\n%-3d|"):format(n)
      end
      local line_numbered_lua = "1  |" .. lua_string:gsub("\n", fn)
      error("Failed to compile generated code:\n" .. tostring(colored.bright(colored.blue(colored.onblack(line_numbered_lua)))) .. "\n\n" .. tostring(err), 0)
    end
    local source_key = tostring(source or lua.source)
    if not (self.source_map[source_key]) then
      local map = { }
      local offset = 1
      source = source or lua.source
      local nomsu_str = tostring(FILE_CACHE[source.filename]:sub(source.start, source.stop))
      local lua_line = 1
      local nomsu_line = pos_to_line(nomsu_str, source.start)
      local fn
      fn = function(s)
        if type(s) == 'string' then
          for nl in s:gmatch("\n") do
            map[lua_line] = map[lua_line] or nomsu_line
            lua_line = lua_line + 1
          end
        else
          local old_line = nomsu_line
          if s.source then
            nomsu_line = pos_to_line(nomsu_str, s.source.start)
          end
          local _list_0 = s.bits
          for _index_0 = 1, #_list_0 do
            local b = _list_0[_index_0]
            fn(b)
          end
        end
      end
      fn(lua)
      map[lua_line] = map[lua_line] or nomsu_line
      map[0] = 0
      self.source_map[source_key] = map
    end
    return run_lua_fn()
  end
  NomsuCompiler.compile = function(self, tree)
    assert(LuaCode)
    local _exp_0 = tree.type
    if "Action" == _exp_0 then
      local stub = tree.stub
      do
        local compile_action = self.COMPILE_ACTIONS[stub]
        if compile_action then
          local args
          do
            local _accum_0 = { }
            local _len_0 = 1
            for _index_0 = 1, #tree do
              local arg = tree[_index_0]
              if type(arg) ~= "string" then
                _accum_0[_len_0] = arg
                _len_0 = _len_0 + 1
              end
            end
            args = _accum_0
          end
          do
            local arg_orders = self.ARG_ORDERS[stub]
            if arg_orders then
              do
                local _accum_0 = { }
                local _len_0 = 1
                for _index_0 = 1, #arg_orders do
                  local p = arg_orders[_index_0]
                  _accum_0[_len_0] = args[p]
                  _len_0 = _len_0 + 1
                end
                args = _accum_0
              end
            end
          end
          local ret = compile_action(self, tree, unpack(args))
          if not ret then
            self:compile_error(tree, "Compile-time action:\n%s\nfailed to produce any Lua")
          end
          return ret
        end
      end
      local action = self['A' .. string.as_lua_id(stub)]
      local lua = LuaCode.Value(tree.source)
      if not action and math_expression:match(stub) then
        for i, tok in ipairs(tree) do
          if type(tok) == 'string' then
            lua:append(tok)
          else
            local tok_lua = self:compile(tok)
            if not (tok_lua.is_value) then
              self:compile_error(tok, "Non-expression value inside math expression:\n%s")
            end
            if tok.type == "Action" then
              tok_lua:parenthesize()
            end
            lua:append(tok_lua)
          end
          if i < #tree then
            lua:append(" ")
          end
        end
        return lua
      end
      local args = { }
      for i, tok in ipairs(tree) do
        local _continue_0 = false
        repeat
          if type(tok) == "string" then
            _continue_0 = true
            break
          end
          local arg_lua = self:compile(tok)
          if not (arg_lua.is_value) then
            self:compile_error(tok, "Cannot use:\n%s\nas an argument to %s, since it's not an expression, it produces: %s", stub, repr(arg_lua))
          end
          insert(args, arg_lua)
          _continue_0 = true
        until true
        if not _continue_0 then
          break
        end
      end
      if action then
        do
          local arg_orders = self.ARG_ORDERS[stub]
          if arg_orders then
            do
              local _accum_0 = { }
              local _len_0 = 1
              for _index_0 = 1, #arg_orders do
                local p = arg_orders[_index_0]
                _accum_0[_len_0] = args[p]
                _len_0 = _len_0 + 1
              end
              args = _accum_0
            end
          end
        end
      end
      lua:append("A", string.as_lua_id(stub), "(")
      for i, arg in ipairs(args) do
        lua:append(arg)
        if i < #args then
          lua:append(", ")
        end
      end
      lua:append(")")
      return lua
    elseif "EscapedNomsu" == _exp_0 then
      local make_tree
      make_tree = function(t)
        if not (AST.is_syntax_tree(t)) then
          return repr(t)
        end
        local bits
        do
          local _accum_0 = { }
          local _len_0 = 1
          for _index_0 = 1, #t do
            local bit = t[_index_0]
            _accum_0[_len_0] = make_tree(bit)
            _len_0 = _len_0 + 1
          end
          bits = _accum_0
        end
        return t.type .. "(" .. repr(tostring(t.source)) .. ", " .. table.concat(bits, ", ") .. ")"
      end
      return LuaCode.Value(tree.source, make_tree(tree[1]))
    elseif "Block" == _exp_0 then
      local lua = LuaCode(tree.source)
      for i, line in ipairs(tree) do
        local line_lua = self:compile(line)
        if i > 1 then
          lua:append("\n")
        end
        lua:append(line_lua:as_statements())
      end
      return lua
    elseif "Text" == _exp_0 then
      local lua = LuaCode.Value(tree.source)
      local string_buffer = ""
      for i, bit in ipairs(tree) do
        local _continue_0 = false
        repeat
          if type(bit) == "string" then
            string_buffer = string_buffer .. bit
            _continue_0 = true
            break
          end
          if string_buffer ~= "" then
            if #lua.bits > 0 then
              lua:append("..")
            end
            lua:append(repr(string_buffer))
            string_buffer = ""
          end
          local bit_lua = self:compile(bit)
          if not (bit_lua.is_value) then
            local src = '    ' .. gsub(tostring(self:tree_to_nomsu(bit)), '\n', '\n    ')
            local line = tostring(bit.source.filename) .. ":" .. tostring(pos_to_line(FILE_CACHE[bit.source.filename], bit.source.start))
            self:compile_error(bit, "Cannot use:\n%s\nas a string interpolation value, since it's not an expression.")
          end
          if #lua.bits > 0 then
            lua:append("..")
          end
          if bit.type ~= "Text" then
            bit_lua = LuaCode.Value(bit.source, "stringify(", bit_lua, ")")
          end
          lua:append(bit_lua)
          _continue_0 = true
        until true
        if not _continue_0 then
          break
        end
      end
      if string_buffer ~= "" or #lua.bits == 0 then
        if #lua.bits > 0 then
          lua:append("..")
        end
        lua:append(repr(string_buffer))
      end
      if #lua.bits > 1 then
        lua:parenthesize()
      end
      return lua
    elseif "List" == _exp_0 then
      local lua = LuaCode.Value(tree.source, "list{")
      local line_length = 0
      for i, item in ipairs(tree) do
        local item_lua = self:compile(item)
        if not (item_lua.is_value) then
          self:compile_error(item, "Cannot use:\n%s\nas a list item, since it's not an expression.")
        end
        lua:append(item_lua)
        local item_string = tostring(item_lua)
        local last_line = match(item_string, "[^\n]*$")
        if match(item_string, "\n") then
          line_length = #last_line
        else
          line_length = line_length + #last_line
        end
        if i < #tree then
          if line_length >= MAX_LINE then
            lua:append(",\n  ")
            line_length = 0
          else
            lua:append(", ")
            line_length = line_length + 2
          end
        end
      end
      lua:append("}")
      return lua
    elseif "Dict" == _exp_0 then
      local lua = LuaCode.Value(tree.source, "dict{")
      local line_length = 0
      for i, entry in ipairs(tree) do
        local entry_lua = self:compile(entry)
        lua:append(entry_lua)
        local entry_lua_str = tostring(entry_lua)
        local last_line = match(entry_lua_str, "\n([^\n]*)$")
        if last_line then
          line_length = #last_line
        else
          line_length = line_length + #entry_lua_str
        end
        if i < #tree then
          if line_length >= MAX_LINE then
            lua:append(",\n  ")
            line_length = 0
          else
            lua:append(", ")
            line_length = line_length + 2
          end
        end
      end
      lua:append("}")
      return lua
    elseif "DictEntry" == _exp_0 then
      local key, value = tree[1], tree[2]
      local key_lua = self:compile(key)
      if not (key_lua.is_value) then
        self:compile_error(tree[1], "Cannot use:\n%s\nas a dict key, since it's not an expression.")
      end
      local value_lua = value and self:compile(value) or LuaCode.Value(key.source, "true")
      if not (value_lua.is_value) then
        self:compile_error(tree[2], "Cannot use:\n%s\nas a dict value, since it's not an expression.")
      end
      local key_str = match(tostring(key_lua), [=[["']([a-zA-Z_][a-zA-Z0-9_]*)['"]]=])
      if key_str then
        return LuaCode(tree.source, key_str, "=", value_lua)
      elseif sub(tostring(key_lua), 1, 1) == "[" then
        return LuaCode(tree.source, "[ ", key_lua, "]=", value_lua)
      else
        return LuaCode(tree.source, "[", key_lua, "]=", value_lua)
      end
    elseif "IndexChain" == _exp_0 then
      local lua = self:compile(tree[1])
      if not (lua.is_value) then
        self:compile_error(tree[1], "Cannot index:\n%s\nsince it's not an expression.")
      end
      local first_char = sub(tostring(lua), 1, 1)
      if first_char == "{" or first_char == '"' or first_char == "[" then
        lua:parenthesize()
      end
      for i = 2, #tree do
        local key = tree[i]
        local key_lua = self:compile(key)
        if not (key_lua.is_value) then
          self:compile_error(key, "Cannot use:\n%s\nas an index, since it's not an expression.")
        end
        local key_lua_str = tostring(key_lua)
        do
          local lua_id = match(key_lua_str, "^['\"]([a-zA-Z_][a-zA-Z0-9_]*)['\"]$")
          if lua_id then
            lua:append("." .. tostring(lua_id))
          elseif sub(key_lua_str, 1, 1) == '[' then
            lua:append("[ ", key_lua, " ]")
          else
            lua:append("[", key_lua, "]")
          end
        end
      end
      return lua
    elseif "Number" == _exp_0 then
      return LuaCode.Value(tree.source, tostring(tree[1]))
    elseif "Var" == _exp_0 then
      return LuaCode.Value(tree.source, string.as_lua_id(tree[1]))
    else
      return error("Unknown type: " .. tostring(tree.type))
    end
  end
  NomsuCompiler.tree_to_nomsu = function(self, tree, inline, can_use_colon)
    if inline == nil then
      inline = false
    end
    if can_use_colon == nil then
      can_use_colon = false
    end
    local _exp_0 = tree.type
    if "Action" == _exp_0 then
      if inline then
        local nomsu = NomsuCode(tree.source)
        for i, bit in ipairs(tree) do
          if type(bit) == "string" then
            if i > 1 then
              nomsu:append(" ")
            end
            nomsu:append(bit)
          else
            local arg_nomsu = self:tree_to_nomsu(bit, true)
            if not (arg_nomsu) then
              return nil
            end
            if not (i == 1) then
              nomsu:append(" ")
            end
            if bit.type == "Action" or bit.type == "Block" then
              arg_nomsu:parenthesize()
            end
            nomsu:append(arg_nomsu)
          end
        end
        return nomsu
      else
        local nomsu = NomsuCode(tree.source)
        local next_space = ""
        local line_len, last_colon = 0, nil
        for i, bit in ipairs(tree) do
          if type(bit) == "string" then
            line_len = line_len + #next_space + #bit
            nomsu:append(next_space, bit)
            next_space = " "
          else
            local arg_nomsu
            if last_colon == i - 1 and bit.type == "Action" then
              arg_nomsu = nil
            elseif bit.type == "Block" then
              arg_nomsu = nil
            else
              arg_nomsu = self:tree_to_nomsu(bit, true)
            end
            if arg_nomsu and line_len + #tostring(arg_nomsu) < MAX_LINE then
              if bit.type == "Action" then
                if can_use_colon and i > 1 then
                  nomsu:append(match(next_space, "[^ ]*"), ": ", arg_nomsu)
                  next_space = "\n.."
                  line_len = 2
                  last_colon = i
                else
                  nomsu:append(next_space, "(", arg_nomsu, ")")
                  line_len = line_len + #next_space + 2 + #tostring(arg_nomsu)
                  next_space = " "
                end
              else
                nomsu:append(next_space, arg_nomsu)
                line_len = line_len + #next_space + #tostring(arg_nomsu)
                next_space = " "
              end
            else
              arg_nomsu = self:tree_to_nomsu(bit, nil, true)
              if not (nomsu) then
                return nil
              end
              if bit.type ~= "List" and bit.type ~= "Dict" and bit.type ~= "Text" then
                if i == 1 then
                  arg_nomsu = NomsuCode(bit.source, "(..)\n    ", arg_nomsu)
                else
                  arg_nomsu = NomsuCode(bit.source, "\n    ", arg_nomsu)
                end
              end
              if last_colon == i - 1 and (bit.type == "Action" or bit.type == "Block") then
                next_space = ""
              end
              nomsu:append(next_space, arg_nomsu)
              next_space = "\n.."
              line_len = 2
            end
            if next_space == " " and #(match(tostring(nomsu), "[^\n]*$")) > MAX_LINE then
              next_space = "\n.."
            end
          end
        end
        return nomsu
      end
    elseif "EscapedNomsu" == _exp_0 then
      local nomsu = self:tree_to_nomsu(tree[1], true)
      if nomsu == nil and not inline then
        nomsu = self:tree_to_nomsu(tree[1])
        return nomsu and NomsuCode(tree.source, "\\:\n    ", nomsu)
      end
      return nomsu and NomsuCode(tree.source, "\\(", nomsu, ")")
    elseif "Block" == _exp_0 then
      if inline then
        local nomsu = NomsuCode(tree.source)
        for i, line in ipairs(tree) do
          if i > 1 then
            nomsu:append("; ")
          end
          local line_nomsu = self:tree_to_nomsu(line, true)
          if not (line_nomsu) then
            return nil
          end
          nomsu:append(line_nomsu)
        end
        return nomsu
      end
      local nomsu = NomsuCode(tree.source)
      for i, line in ipairs(tree) do
        line = assert(self:tree_to_nomsu(line, nil, true), "Could not convert line to nomsu")
        nomsu:append(line)
        if i < #tree then
          nomsu:append("\n")
          if match(tostring(line), "\n") then
            nomsu:append("\n")
          end
        end
      end
      return nomsu
    elseif "Text" == _exp_0 then
      if inline then
        local nomsu = NomsuCode(tree.source, '"')
        for _index_0 = 1, #tree do
          local bit = tree[_index_0]
          if type(bit) == 'string' then
            nomsu:append((gsub(gsub(gsub(bit, "\\", "\\\\"), "\n", "\\n"), '"', '\\"')))
          else
            local interp_nomsu = self:tree_to_nomsu(bit, true)
            if interp_nomsu then
              if bit.type ~= "Var" and bit.type ~= "List" and bit.type ~= "Dict" and bit.type ~= "Text" then
                interp_nomsu:parenthesize()
              end
              nomsu:append("\\", interp_nomsu)
            else
              return nil
            end
          end
        end
        nomsu:append('"')
        return nomsu
      else
        local inline_version = self:tree_to_nomsu(tree, true)
        if inline_version and #inline_version <= MAX_LINE then
          return inline_version
        end
        local nomsu = NomsuCode(tree.source, '".."\n    ')
        for i, bit in ipairs(tree) do
          if type(bit) == 'string' then
            local bit_lines = get_lines:match(bit)
            for j, line in ipairs(bit_lines) do
              if j > 1 then
                nomsu:append("\n    ")
              end
              if #line > 1.25 * MAX_LINE then
                local remainder = line
                while #remainder > 0 do
                  local split = find(remainder, " ", MAX_LINE, true)
                  if split then
                    local chunk
                    chunk, remainder = sub(remainder, 1, split), sub(remainder, split + 1, -1)
                    nomsu:append(chunk)
                  elseif #remainder > 1.75 * MAX_LINE then
                    split = math.floor(1.5 * MAX_LINE)
                    local chunk
                    chunk, remainder = sub(remainder, 1, split), sub(remainder, split + 1, -1)
                    nomsu:append(chunk)
                  else
                    nomsu:append(remainder)
                    break
                  end
                  if #remainder > 0 then
                    nomsu:append("\\\n    ..")
                  end
                end
              else
                nomsu:append(line)
              end
            end
          else
            local interp_nomsu = self:tree_to_nomsu(bit, true)
            if interp_nomsu then
              if bit.type ~= "Var" and bit.type ~= "List" and bit.type ~= "Dict" and bit.type ~= "Text" then
                interp_nomsu:parenthesize()
              end
              nomsu:append("\\", interp_nomsu)
            else
              interp_nomsu = assert(self:tree_to_nomsu(bit))
              if not (interp_nomsu) then
                return nil
              end
              nomsu:append("\\\n        ", interp_nomsu)
              if i < #tree then
                nomsu:append("\n    ..")
              end
            end
          end
        end
        return nomsu
      end
    elseif "List" == _exp_0 then
      if inline then
        local nomsu = NomsuCode(tree.source, "[")
        for i, item in ipairs(tree) do
          local item_nomsu = self:tree_to_nomsu(item, true)
          if not (item_nomsu) then
            return nil
          end
          if i > 1 then
            nomsu:append(", ")
          end
          nomsu:append(item_nomsu)
        end
        nomsu:append("]")
        return nomsu
      else
        local inline_version = self:tree_to_nomsu(tree, true)
        if inline_version and #inline_version <= MAX_LINE then
          return inline_version
        end
        local nomsu = NomsuCode(tree.source, "[..]")
        local line = NomsuCode(tree.source, "\n    ")
        for _index_0 = 1, #tree do
          local item = tree[_index_0]
          local item_nomsu = self:tree_to_nomsu(item, true)
          if item_nomsu and #line + #", " + #item_nomsu <= MAX_LINE then
            if #line.bits > 1 then
              line:append(", ")
            end
            line:append(item_nomsu)
          else
            if not (item_nomsu) then
              item_nomsu = self:tree_to_nomsu(item)
              if not (item_nomsu) then
                return nil
              end
            end
            if #line.bits > 1 then
              nomsu:append(line)
              line = NomsuCode(line.source, "\n    ")
            end
            line:append(item_nomsu)
          end
        end
        if #line.bits > 1 then
          nomsu:append(line)
        end
        return nomsu
      end
    elseif "Dict" == _exp_0 then
      if inline then
        local nomsu = NomsuCode(tree.source, "{")
        for i, entry in ipairs(tree) do
          local entry_nomsu = self:tree_to_nomsu(entry, true)
          if not (entry_nomsu) then
            return nil
          end
          if i > 1 then
            nomsu:append(", ")
          end
          nomsu:append(entry_nomsu)
        end
        nomsu:append("}")
        return nomsu
      else
        local inline_version = self:tree_to_nomsu(tree, true)
        if inline_version then
          return inline_version
        end
        local nomsu = NomsuCode(tree.source, "{..}")
        local line = NomsuCode(tree.source, "\n    ")
        for _index_0 = 1, #tree do
          local entry = tree[_index_0]
          local entry_nomsu = self:tree_to_nomsu(entry)
          if not (entry_nomsu) then
            return nil
          end
          if #line + #tostring(entry_nomsu) <= MAX_LINE then
            if #line.bits > 1 then
              line:append(", ")
            end
            line:append(entry_nomsu)
          else
            if #line.bits > 1 then
              nomsu:append(line)
              line = NomsuCode(line.source, "\n    ")
            end
            line:append(entry_nomsu)
          end
        end
        if #line.bits > 1 then
          nomsu:append(line)
        end
        return nomsu
      end
    elseif "DictEntry" == _exp_0 then
      local key, value = tree[1], tree[2]
      local key_nomsu = self:tree_to_nomsu(key, true)
      if not (key_nomsu) then
        return nil
      end
      if key.type == "Action" or key.type == "Block" then
        key_nomsu:parenthesize()
      end
      local value_nomsu
      if value then
        value_nomsu = self:tree_to_nomsu(value, true)
      else
        value_nomsu = NomsuCode(tree.source, "")
      end
      if inline and not value_nomsu then
        return nil
      end
      if not value_nomsu then
        if inline then
          return nil
        end
        value_nomsu = self:tree_to_nomsu(value)
        if not (value_nomsu) then
          return nil
        end
      end
      return NomsuCode(tree.source, key_nomsu, ":", value_nomsu)
    elseif "IndexChain" == _exp_0 then
      local nomsu = NomsuCode(tree.source)
      for i, bit in ipairs(tree) do
        if i > 1 then
          nomsu:append(".")
        end
        local bit_nomsu
        if bit.type == "Text" and #bit == 1 and type(bit[1]) == 'string' then
          if bit[1]:match("[_a-zA-Z][_a-zA-Z0-9]*") then
            bit_nomsu = bit[1]
          end
        end
        if not (bit_nomsu) then
          bit_nomsu = self:tree_to_nomsu(bit, true)
        end
        if not (bit_nomsu) then
          return nil
        end
        local _exp_1 = bit.type
        if "Action" == _exp_1 or "Block" == _exp_1 or "IndexChain" == _exp_1 then
          bit_nomsu:parenthesize()
        elseif "Number" == _exp_1 then
          if i < #tree then
            bit_nomsu:parenthesize()
          end
        end
        nomsu:append(bit_nomsu)
      end
      return nomsu
    elseif "Number" == _exp_0 then
      return NomsuCode(tree.source, tostring(tree[1]))
    elseif "Var" == _exp_0 then
      return NomsuCode(tree.source, "%", tree[1])
    else
      return error("Unknown type: " .. tostring(tree.type))
    end
  end
end
if arg and debug_getinfo(2).func ~= require then
  colors = require('consolecolors')
  local parser = re.compile([[        args <- {| (flag ";")* {:inputs: {| ({file} ";")* |} :} {:nomsu_args: {| ("--;" ({[^;]*} ";")*)? |} :} ";"? |} !.
        flag <-
            {:interactive: ("-i" -> true) :}
          / {:optimized: ("-O" -> true) :}
          / {:format: ("-f" -> true) :}
          / {:syntax: ("-s" -> true) :}
          / {:print_file: "-p" ";" {file} :}
          / {:compile: ("-c" -> true) :}
          / {:verbose: ("-v" -> true) :}
          / {:help: (("-h" / "--help") -> true) :}
        file <- "-" / [^;]+
    ]], {
    ["true"] = function()
      return true
    end
  })
  local args = concat(arg, ";") .. ";"
  args = parser:match(args)
  if not args or args.help then
    print([=[Nomsu Compiler

Usage: (lua nomsu.lua | moon nomsu.moon) [-i] [-O] [-v] [-c] [-f] [-s] [--help] [-p print_file] file1 file2... [-- nomsu args...]

OPTIONS
    -i Run the compiler in interactive mode (REPL)
    -O Run the compiler in optimized mode (use precompiled .lua versions of Nomsu files, when available)
    -v Verbose: print compiled lua code
    -c Compile .nom files into .lua files
    -f Auto-format the given Nomsu file and print the result.
    -s Check the program for syntax errors.
    -h/--help Print this message.
    -p <file> Print to the specified file instead of stdout.
    <input> Input file can be "-" to use stdin.
]=])
    os.exit()
  end
  local nomsu = NomsuCompiler
  nomsu.arg = args.nomsu_args
  local ok, to_lua = pcall(function()
    return require('moonscript.base').to_lua
  end)
  if not ok then
    to_lua = nil
  end
  local moonscript_line_tables = setmetatable({ }, {
    __index = function(self, filename)
      if not (to_lua) then
        return nil
      end
      local _, line_table = to_lua(FILE_CACHE[filename])
      self[filename] = line_table
      return line_table
    end
  })
  debug.getinfo = function(thread, f, what)
    if what == nil then
      f, what, thread = thread, f, nil
    end
    if type(f) == 'number' then
      f = f + 1
    end
    local info
    if thread == nil then
      info = debug_getinfo(f, what)
    else
      info = debug_getinfo(thread, f, what)
    end
    if not info or not info.func then
      return info
    end
    if info.short_src or info.source or info.linedefine or info.currentline then
      do
        local arg_orders = nomsu.ARG_ORDERS[info.func]
        if arg_orders then
          info.name = next(arg_orders)
        end
      end
      do
        local map = nomsu.source_map[info.source]
        if map then
          if info.currentline then
            info.currentline = assert(map[info.currentline])
          end
          if info.linedefined then
            info.linedefined = assert(map[info.linedefined])
          end
          if info.lastlinedefined then
            info.lastlinedefined = assert(map[info.lastlinedefined])
          end
        end
      end
    end
    return info
  end
  local print_err_msg
  print_err_msg = function(error_message, stack_offset)
    if stack_offset == nil then
      stack_offset = 3
    end
    io.stderr:write(tostring(colored.red("ERROR:")) .. " " .. tostring(colored.bright(colored.red((error_message or "")))) .. "\n")
    io.stderr:write("stack traceback:\n")
    ok, to_lua = pcall(function()
      return require('moonscript.base').to_lua
    end)
    if not ok then
      to_lua = function()
        return nil
      end
    end
    local nomsu_source = FILE_CACHE["nomsu.moon"]
    local LINE_TABLES = setmetatable({ }, {
      __index = function(self, file)
        local _, line_table = to_lua(file)
        self[file] = line_table or false
        return line_table or false
      end
    })
    local get_line
    get_line = function(file, line_no)
      local start = LINE_STARTS[file][line_no] or 1
      local stop = (LINE_STARTS[file][line_no + 1] or 0) - 1
      return file:sub(start, stop)
    end
    local level = stack_offset
    while true do
      local _continue_0 = false
      repeat
        local calling_fn = debug_getinfo(level)
        if not calling_fn then
          break
        end
        if calling_fn.func == run then
          break
        end
        level = level + 1
        local name = calling_fn.name and "function '" .. tostring(calling_fn.name) .. "'" or nil
        if calling_fn.linedefined == 0 then
          name = "main chunk"
        end
        if name == "run_lua_fn" then
          _continue_0 = true
          break
        end
        local line = nil
        do
          local map = nomsu.source_map[calling_fn.source]
          if map then
            if calling_fn.currentline then
              calling_fn.currentline = assert(map[calling_fn.currentline])
            end
            if calling_fn.linedefined then
              calling_fn.linedefined = assert(map[calling_fn.linedefined])
            end
            if calling_fn.lastlinedefined then
              calling_fn.lastlinedefined = assert(map[calling_fn.lastlinedefined])
            end
            local filename, start, stop = calling_fn.source:match('@([^[]*)%[([0-9]+):([0-9]+)]')
            assert(filename)
            local file = FILE_CACHE[filename]:sub(tonumber(start), tonumber(stop))
            local err_line = get_line(file, calling_fn.currentline):sub(1, -2)
            local offending_statement = colored.bright(colored.red(err_line:match("^[ ]*(.*)")))
            do
              local arg_orders = nomsu.ARG_ORDERS[calling_fn.func]
              if arg_orders then
                name = "action '" .. tostring(next(arg_orders)) .. "'"
              else
                name = "main chunk"
              end
            end
            line = colored.yellow(tostring(filename) .. ":" .. tostring(calling_fn.currentline) .. " in " .. tostring(name) .. "\n        " .. tostring(offending_statement))
          else
            local file
            ok, file = pcall(function()
              return FILE_CACHE[calling_fn.short_src]
            end)
            if not ok then
              file = nil
            end
            local line_num
            if name == nil then
              local search_level = level
              local _info = debug.getinfo(search_level)
              while _info and (_info.func == pcall or _info.func == xpcall) do
                search_level = search_level + 1
                _info = debug.getinfo(search_level)
              end
              if _info then
                for i = 1, 999 do
                  local varname, val = debug.getlocal(search_level, i)
                  if not varname then
                    break
                  end
                  if val == calling_fn.func then
                    name = "local '" .. tostring(varname) .. "'"
                    if not varname:match("%(") then
                      break
                    end
                  end
                end
                if not (name) then
                  for i = 1, _info.nups do
                    local varname, val = debug.getupvalue(_info.func, i)
                    if not varname then
                      break
                    end
                    if val == calling_fn.func then
                      name = "upvalue '" .. tostring(varname) .. "'"
                      if not varname:match("%(") then
                        break
                      end
                    end
                  end
                end
              end
            end
            if file and calling_fn.short_src:match(".moon$") and LINE_TABLES[file] then
              local char = LINE_TABLES[file][calling_fn.currentline]
              line_num = 1
              for _ in file:sub(1, char):gmatch("\n") do
                line_num = line_num + 1
              end
              line = colored.cyan(tostring(calling_fn.short_src) .. ":" .. tostring(line_num) .. " in " .. tostring(name or '?'))
            else
              line_num = calling_fn.currentline
              if calling_fn.short_src == '[C]' then
                line = colored.green(tostring(calling_fn.short_src) .. " in " .. tostring(name or '?'))
              else
                line = colored.blue(tostring(calling_fn.short_src) .. ":" .. tostring(calling_fn.currentline) .. " in " .. tostring(name or '?'))
              end
            end
            if file then
              local err_line = get_line(file, line_num):sub(1, -2)
              local offending_statement = colored.bright(colored.red(err_line:match("^[ ]*(.*)$")))
              line = line .. ("\n        " .. offending_statement)
            end
          end
        end
        io.stderr:write("    " .. tostring(line) .. "\n")
        if calling_fn.istailcall then
          io.stderr:write("    " .. tostring(colored.dim(colored.white("  (...tail calls...)"))) .. "\n")
        end
        _continue_0 = true
      until true
      if not _continue_0 then
        break
      end
    end
    return io.stderr:flush()
  end
  local run
  run = function()
    for i, input in ipairs(args.inputs) do
      if input == "-" then
        args.inputs[i] = STDIN
      end
    end
    if #args.inputs == 0 and not args.interactive then
      args.inputs = {
        "core"
      }
      args.interactive = true
    end
    local print_file
    if args.print_file == "-" then
      print_file = io.stdout
    elseif args.print_file then
      print_file = io.open(args.print_file, 'w')
    else
      print_file = io.stdout
    end
    nomsu.skip_precompiled = not args.optimized
    if print_file == nil then
      nomsu.print = function() end
    elseif print_file ~= io.stdout then
      nomsu.print = function(...)
        local N = select("#", ...)
        if N > 0 then
          print_file:write(tostring(select(1, ...)))
          for i = 2, N do
            print_file:write('\t', tostring(select(1, ...)))
          end
        end
        print_file:write('\n')
        return print_file:flush()
      end
    end
    local input_files = { }
    local to_run = { }
    local _list_0 = args.inputs
    for _index_0 = 1, #_list_0 do
      local input = _list_0[_index_0]
      for f in all_files(input) do
        input_files[#input_files + 1] = f
        to_run[f] = true
      end
    end
    if args.compile or args.verbose then
      nomsu.on_compile = function(code, from_file)
        if to_run[from_file] then
          if args.verbose then
            io.write(tostring(code), "\n")
          end
          if args.compile and from_file:match("%.nom$") then
            local output_filename = from_file:gsub("%.nom$", ".lua")
            local output_file = io.open(output_filename, 'w')
            output_file:write(tostring(code))
            output_file:flush()
            print(("Compiled %-25s -> %s"):format(from_file, output_filename))
            return output_file:close()
          end
        end
      end
    else
      nomsu.on_compile = nil
    end
    local parse_errs = { }
    for _index_0 = 1, #input_files do
      local filename = input_files[_index_0]
      if args.syntax then
        local file_contents = io.open(filename):read('*a')
        local err
        ok, err = pcall(nomsu.parse, nomsu, file_contents, Source(filename, 1, #file_contents))
        if not ok then
          insert(parse_errs, err)
        elseif print_file then
          print_file:write("Parse succeeded: " .. tostring(filename) .. "\n")
          print_file:flush()
        end
      elseif args.format then
        local file = FILE_CACHE[filename]
        if not file then
          error("File does not exist: " .. tostring(filename), 0)
        end
        local tree = nomsu:parse(file, Source(filename, 1, #file))
        local formatted = tostring(nomsu:tree_to_nomsu(tree))
        if print_file then
          print_file:write(formatted, "\n")
          print_file:flush()
        end
      elseif filename == STDIN then
        local file = io.input():read("*a")
        FILE_CACHE.stdin = file
        nomsu:run(file, Source('stdin', 1, #file))
      else
        nomsu:run_file(filename)
      end
    end
    if #parse_errs > 0 then
      io.stderr:write(concat(parse_errs, "\n\n"))
      io.stderr:flush()
      os.exit(false, true)
    elseif args.syntax then
      os.exit(true, true)
    end
    if args.interactive then
      for repl_line = 1, math.huge do
        io.write(colored.bright(colored.yellow(">> ")))
        local buff = { }
        while true do
          local line = io.read("*L")
          if line == "\n" or not line then
            if #buff > 0 then
              io.write("\027[1A\027[2K")
            end
            break
          end
          line = line:gsub("\t", "    ")
          insert(buff, line)
          io.write(colored.dim(colored.yellow(".. ")))
        end
        if #buff == 0 then
          break
        end
        buff = concat(buff)
        FILE_CACHE["REPL#" .. repl_line] = buff
        local err_hand
        err_hand = function(error_message)
          return print_err_msg(error_message)
        end
        local ret
        ok, ret = xpcall(nomsu.run, err_hand, nomsu, buff, Source("REPL#" .. repl_line, 1, #buff))
        if ok and ret ~= nil then
          print("= " .. repr(ret))
        elseif not ok then
          print_err_msg(ret)
        end
      end
    end
  end
  local err_hand
  err_hand = function(error_message)
    print_err_msg(error_message)
    return os.exit(false, true)
  end
  do
    local ldt
    ok, ldt = pcall(require, 'ldt')
    if ok then
      ldt.guard(run)
    else
      xpcall(run, err_hand)
    end
  end
end
return NomsuCompiler