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Overview
Comment:Pridany dalsi casti.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:55525ed0a62dd26de91e40b9ca1b7e62944e0a36
User & Date: Yasha 2014-04-21 15:54:38
Context
2014-04-21
16:07
Budeme mit testy. check-in: 9d774c8178 user: Yasha tags: trunk
15:54
Pridany dalsi casti. check-in: 55525ed0a6 user: Yasha tags: trunk
2014-03-16
14:18
Zaciname! check-in: 5e0dd8d9d5 user: Yasha tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Added lib/30log.lua.













































































































































































































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local assert       = assert
local pairs        = pairs
local type         = type
local tostring     = tostring
local setmetatable = setmetatable

local baseMt     = {}
local _instances = setmetatable({},{__mode='k'})
local _classes   = setmetatable({},{__mode='k'})
local class

local function deep_copy(t, dest, aType)
  local t = t or {}
  local r = dest or {}
  
  for k,v in pairs(t) do
    if aType and type(v)==aType then 
      r[k] = v 
    elseif not aType then
      if type(v) == 'table' and k ~= "__index" then 
        r[k] = deep_copy(v) 
      else
        r[k] = v
      end
    end
  end
  
  return r
end

local function instantiate(self,...)
  assert(_classes[self], 'new() should be called from a class.')
  local instance = deep_copy(self)
  _instances[instance] = tostring(instance)
  setmetatable(instance,self)
  
  if self.__init then
    if type(self.__init) == 'table' then
      deep_copy(self.__init, instance)
    else
      self.__init(instance, ...)
    end
  end
  
  return instance
end

local function extends(self,extra_params)
  local heir = {}
  _classes[heir] = tostring(heir)
  deep_copy(extra_params, deep_copy(self, heir))
  heir.__index = heir
  heir.super = self
  return setmetatable(heir,self)
end

baseMt = {
  __call = function (self,...)
    return self:new(...)
  end,
  
  __tostring = function(self,...)
    if _instances[self] then
      return 
        ('object(of %s):<%s>')
          :format((rawget(getmetatable(self),'__name') or '?'), _instances[self])
    end
    
    return
      _classes[self] and 
      ('class(%s):<%s>')
        :format((rawget(self,'__name') or '?'),_classes[self]) or 
      self      
  end
}

class = function(attr)
  local c = deep_copy(attr)
  _classes[c] = tostring(c)
  c.include = function(self,include)
    assert(_classes[self], 'Mixins can only be used on classes.')
    return deep_copy(include, self, 'function')
  end
  
  c.new = instantiate
  c.extends = extends
  c.__index = c
  c.__call = baseMt.__call
  c.__tostring = baseMt.__tostring
  
  c.is = function(self, kind)
    local super
    while true do 
      super = getmetatable(super or self)
      if super == kind or super == nil then break end
    end
    return kind and (super == kind)
  end
  return setmetatable(c, baseMt)
end

return class

Added lib/argparse.lua.



























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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local Parser, Command, Argument, Option

do -- Create classes with setters
   local class = require "30log"

   local function add_setters(cl, fields)
      for field, setter in pairs(fields) do
         cl[field] = function(self, value)
            setter(self, value)
            self["_"..field] = value
            return self
         end
      end

      cl.__init = function(self, ...)
         return self(...)
      end

      cl.__call = function(self, ...)
         local name_or_options

         for i=1, select("#", ...) do
            name_or_options = select(i, ...)

            if type(name_or_options) == "string" then
               if self._aliases then
                  table.insert(self._aliases, name_or_options)
               end

               if not self._aliases or not self._name then
                  self._name = name_or_options
               end
            elseif type(name_or_options) == "table" then
               for field, setter in pairs(fields) do
                  if name_or_options[field] ~= nil then
                     self[field](self, name_or_options[field])
                  end
               end
            end
         end

         return self
      end

      return cl
   end

   local typecheck = setmetatable({}, {
      __index = function(self, type_)
         local typechecker_factory = function(field)
            return function(_, value)
               if type(value) ~= type_ then
                  error(("bad field '%s' (%s expected, got %s)"):format(field, type_, type(value)))
               end
            end
         end

         self[type_] = typechecker_factory
         return typechecker_factory
      end
   })

   local function aliased_name(self, name)
      typecheck.string "name" (self, name)

      table.insert(self._aliases, name)
   end

   local function aliased_aliases(self, aliases)
      typecheck.table "aliases" (self, aliases)

      if not self._name then
         self._name = aliases[1]
      end
   end

   local function parse_boundaries(boundaries)
      if tonumber(boundaries) then
         return tonumber(boundaries), tonumber(boundaries)
      end

      if boundaries == "*" then
         return 0, math.huge
      end

      if boundaries == "+" then
         return 1, math.huge
      end

      if boundaries == "?" then
         return 0, 1
      end

      if boundaries:match "^%d+%-%d+$" then
         local min, max = boundaries:match "^(%d+)%-(%d+)$"
         return tonumber(min), tonumber(max)
      end

      if boundaries:match "^%d+%+$" then
         local min = boundaries:match "^(%d+)%+$"
         return tonumber(min), math.huge
      end
   end

   local function boundaries(field)
      return function(self, value)
         local min, max = parse_boundaries(value)

         if not min then
            error(("bad field '%s'"):format(field))
         end

         self["_min"..field], self["_max"..field] = min, max
      end
   end

   local function convert(self, value)
      if type(value) ~= "function" then
         if type(value) ~= "table" then
            error(("bad field 'convert' (function or table expected, got %s)"):format(type(value)))
         end
      end
   end

   local function argname(self, value)
      if type(value) ~= "string" then
         if type(value) ~= "table" then
            error(("bad field 'argname' (string or table expected, got %s)"):format(type(value)))
         end
      end
   end

   local function add_help(self, param)
      if self._has_help then
         table.remove(self._options)
         self._has_help = false
      end

      if param then
         local help = self:flag()
            :description "Show this help message and exit. "
            :action(function()
               io.stdout:write(self:get_help() .. "\r\n")
               os.exit(0)
            end)(param)

         if not help._name then
            help "-h" "--help"
         end

         self._has_help = true
      end
   end

   Parser = add_setters(class {
      __name = "Parser",
      _arguments = {},
      _options = {},
      _commands = {},
      _mutexes = {},
      _require_command = true
   }, {
      name = typecheck.string "name",
      description = typecheck.string "description",
      epilog = typecheck.string "epilog",
      require_command = typecheck.boolean "require_command",
      usage = typecheck.string "usage",
      help = typecheck.string "help",
      add_help = add_help
   })

   Command = add_setters(Parser:extends {
      __name = "Command",
      _aliases = {}
   }, {
      name = aliased_name,
      aliases = aliased_aliases,
      description = typecheck.string "description",
      epilog = typecheck.string "epilog",
      target = typecheck.string "target",
      require_command = typecheck.boolean "require_command",
      action = typecheck["function"] "action",
      usage = typecheck.string "usage",
      help = typecheck.string "help",
      add_help = add_help
   })

   Argument = add_setters(class {
      __name = "Argument",
      _minargs = 1,
      _maxargs = 1,
      _mincount = 1,
      _maxcount = 1,
      _defmode = "unused"
   }, {
      name = typecheck.string "name",
      description = typecheck.string "description",
      target = typecheck.string "target",
      args = boundaries "args",
      default = typecheck.string "default",
      defmode = typecheck.string "defmode",
      convert = convert,
      argname = argname
   })

   Option = add_setters(Argument:extends {
      __name = "Option",
      _aliases = {},
      _mincount = 0,
      _overwrite = true
   }, {
      name = aliased_name,
      aliases = aliased_aliases,
      description = typecheck.string "description",
      target = typecheck.string "target",
      args = boundaries "args",
      count = boundaries "count",
      default = typecheck.string "default",
      defmode = typecheck.string "defmode",
      convert = convert,
      overwrite = typecheck.boolean "overwrite",
      action = typecheck["function"] "action",
      argname = argname
   })
end

function Argument:_get_argument_list()
   local buf = {}
   local i = 1

   while i <= math.min(self._minargs, 3) do
      local argname = self:_get_argname_i(i)

      if self._default and self._defmode:find "a" then
         argname = "[" .. argname .. "]"
      end

      table.insert(buf, argname)
      i = i+1
   end

   while i <= math.min(self._maxargs, 3) do
      table.insert(buf, "[" .. self:_get_argname_i(i) .. "]")
      i = i+1

      if self._maxargs == math.huge then
         break
      end
   end

   if i < self._maxargs then
      table.insert(buf, "...")
   end

   return buf
end

function Argument:_get_usage()
   local usage = table.concat(self:_get_argument_list(), " ")

   if self._default and self._defmode:find "u" then
      if self._maxargs > 1 or (self._minargs == 1 and not self._defmode:find "a") then
         usage = "[" .. usage .. "]"
      end
   end

   return usage
end

function Argument:_get_type()
   if self._maxcount == 1 then
      if self._maxargs == 0 then
         return "flag"
      elseif self._maxargs == 1 and (self._minargs == 1 or self._mincount == 1) then
         return "arg"
      else
         return "multiarg"
      end
   else
      if self._maxargs == 0 then
         return "counter"
      elseif self._maxargs == 1 and self._minargs == 1 then
         return "multicount"
      else
         return "twodimensional"
      end
   end
end

function Argument:_get_argname_i(i)
   local argname = self:_get_argname()

   if type(argname) == "table" then
      return argname[i]
   else
      return argname
   end
end

function Argument:_get_argname()
   return self._argname or ("<"..self._name..">")
end

function Option:_get_argname()
   return self._argname or ("<"..self:_get_target()..">")
end

function Argument:_get_label()
   return self._name
end

function Option:_get_label()
   local variants = {}
   local argument_list = self:_get_argument_list()
   table.insert(argument_list, 1, nil)

   for _, alias in ipairs(self._aliases) do
      argument_list[1] = alias
      table.insert(variants, table.concat(argument_list, " "))
   end

   return table.concat(variants, ", ")
end

function Command:_get_label()
   return table.concat(self._aliases, ", ")
end

function Argument:_get_description()
   if self._default then
      if self._description then
         return ("%s (default: %s)"):format(self._description, self._default)
      else
         return ("default: %s"):format(self._default)
      end
   else
      return self._description or ""
   end
end

function Command:_get_description()
   return self._description or ""
end

function Option:_get_usage()
   local usage = self:_get_argument_list()
   table.insert(usage, 1, self._name)
   usage = table.concat(usage, " ")

   if self._mincount == 0 or self._default then
      usage = "[" .. usage .. "]"
   end

   return usage
end

function Option:_get_target()
   if self._target then
      return self._target
   end

   for _, alias in ipairs(self._aliases) do
      if alias:sub(1, 1) == alias:sub(2, 2) then
         return alias:sub(3)
      end
   end

   return self._name:sub(2)
end

function Parser:_get_fullname()
   local parent = self._parent
   local buf = {self._name}

   while parent do
      table.insert(buf, 1, parent._name)
      parent = parent._parent
   end

   return table.concat(buf, " ")
end

function Parser:_update_charset(charset)
   charset = charset or {}

   for _, command in ipairs(self._commands) do
      command:_update_charset(charset)
   end

   for _, option in ipairs(self._options) do
      for _, alias in ipairs(option._aliases) do
         charset[alias:sub(1, 1)] = true
      end
   end

   return charset
end

function Parser:argument(...)
   local argument = Argument:new(...)
   table.insert(self._arguments, argument)
   return argument
end

function Parser:option(...)
   local option = Option:new(...)

   if self._has_help then
      table.insert(self._options, #self._options, option)
   else
      table.insert(self._options, option)
   end

   return option
end

function Parser:flag(...)
   return self:option():args(0)(...)
end

function Parser:command(...)
   local command = Command:new():add_help(true)(...)
   command._parent = self
   table.insert(self._commands, command)
   return command
end

function Parser:mutex(...)
   local options = {...}

   for i, option in ipairs(options) do
      assert(getmetatable(option) == Option, ("bad argument #%d to 'mutex' (Option expected)"):format(i))
   end

   table.insert(self._mutexes, options)
   return self
end

local max_usage_width = 70
local usage_welcome = "Usage: "

function Parser:get_usage()
   if self._usage then
      return self._usage
   end

   local lines = {usage_welcome .. self:_get_fullname()}

   local function add(s)
      if #lines[#lines]+1+#s <= max_usage_width then
         lines[#lines] = lines[#lines] .. " " .. s
      else
         lines[#lines+1] = (" "):rep(#usage_welcome) .. s
      end
   end

   -- set of mentioned elements
   local used = {}

   for _, mutex in ipairs(self._mutexes) do
      local buf = {}

      for _, option in ipairs(mutex) do
         table.insert(buf, option:_get_usage())
         used[option] = true
      end

      add("(" .. table.concat(buf, " | ") .. ")")
   end

   for _, elements in ipairs{self._options, self._arguments} do
      for _, element in ipairs(elements) do
         if not used[element] then
            add(element:_get_usage())
         end
      end
   end

   if #self._commands > 0 then
      if self._require_command then
         add("<command>")
      else
         add("[<command>]")
      end

      add("...")
   end

   return table.concat(lines, "\r\n")
end

local margin_len = 3
local margin_len2 = 25
local margin = (" "):rep(margin_len)
local margin2 = (" "):rep(margin_len2)

local function make_two_columns(s1, s2)
   if s2 == "" then
      return margin .. s1
   end

   s2 = s2:gsub("[\r\n][\r\n]?", function(sub)
      if #sub == 1 or sub == "\r\n" then
         return "\r\n" .. margin2
      else
         return "\r\n\r\n" .. margin2
      end
   end)

   if #s1 < (margin_len2-margin_len) then
      return margin .. s1 .. (" "):rep(margin_len2-margin_len-#s1) .. s2
   else
      return margin .. s1 .. "\r\n" .. margin2 .. s2
   end
end

function Parser:get_help()
   if self._help then
      return self._help
   end

   local blocks = {self:get_usage()}
   
   if self._description then
      table.insert(blocks, self._description)
   end

   local labels = {"Arguments: ", "Options: ", "Commands: "}

   for i, elements in ipairs{self._arguments, self._options, self._commands} do
      if #elements > 0 then
         local buf = {labels[i]}

         for _, element in ipairs(elements) do
            table.insert(buf, make_two_columns(element:_get_label(), element:_get_description()))
         end

         table.insert(blocks, table.concat(buf, "\r\n"))
      end
   end

   if self._epilog then
      table.insert(blocks, self._epilog)
   end

   return table.concat(blocks, "\r\n\r\n")
end

local function get_tip(context, wrong_name)
   local context_pool = {}
   local possible_name
   local possible_names = {}

   for name in pairs(context) do
      for i=1, #name do
         possible_name = name:sub(1, i-1) .. name:sub(i+1)

         if not context_pool[possible_name] then
            context_pool[possible_name] = {}
         end

         table.insert(context_pool[possible_name], name)
      end
   end

   for i=1, #wrong_name+1 do
      possible_name = wrong_name:sub(1, i-1) .. wrong_name:sub(i+1)

      if context[possible_name] then
         possible_names[possible_name] = true
      elseif context_pool[possible_name] then
         for _, name in ipairs(context_pool[possible_name]) do
            possible_names[name] = true
         end
      end
   end

   local first = next(possible_names)
   if first then
      if next(possible_names, first) then
         local possible_names_arr = {}

         for name in pairs(possible_names) do
            table.insert(possible_names_arr, "'" .. name .. "'")
         end

         table.sort(possible_names_arr)
         return "\r\nDid you mean one of these: " .. table.concat(possible_names_arr, " ") .. "?"
      else
         return "\r\nDid you mean '" .. first .. "'?"
      end
   else
      return ""
   end
end

local function plural(x)
   if x == 1 then
      return ""
   end

   return "s"
end

local default_cmdline = arg or {}

function Parser:_parse(args, errhandler)
   args = args or default_cmdline
   local parser
   local charset
   local options = {}
   local arguments = {}
   local commands
   local option_mutexes = {}
   local used_mutexes = {}
   local opt_context = {}
   local com_context
   local result = {}
   local invocations = {}
   local passed = {}
   local cur_option
   local cur_arg_i = 1
   local cur_arg
   local targets = {}

   local function error_(fmt, ...)
      return errhandler(parser, fmt:format(...))
   end

   local function assert_(assertion, ...)
      return assertion or error_(...)
   end

   local function convert(element, data)
      if element._convert then
         local ok, err

         if type(element._convert) == "function" then
            ok, err = element._convert(data)
         else
            ok, err = element._convert[data]
         end

         assert_(ok ~= nil, "%s", err or "malformed argument '" .. data .. "'")
         data = ok
      end

      return data
   end

   local invoke, pass, close

   function invoke(element)
      local overwrite = false

      if invocations[element] == element._maxcount then
         if element._overwrite then
            overwrite = true
         else
            error_("option '%s' must be used at most %d time%s", element._name, element._maxcount, plural(element._maxcount))
         end
      else
         invocations[element] = invocations[element]+1
      end

      passed[element] = 0
      local type_ = element:_get_type()
      local target = targets[element]

      if type_ == "flag" then
         result[target] = true
      elseif type_ == "multiarg" then
         result[target] = {}
      elseif type_ == "counter" then
         if not overwrite then
            result[target] = result[target]+1
         end
      elseif type_ == "multicount" then
         if overwrite then
            table.remove(result[target], 1)
         end
      elseif type_ == "twodimensional" then
         table.insert(result[target], {})

         if overwrite then
            table.remove(result[target], 1)
         end
      end

      if element._maxargs == 0 then
         close(element)
      end
   end

   function pass(element, data)
      passed[element] = passed[element]+1
      data = convert(element, data)
      local type_ = element:_get_type()
      local target = targets[element]

      if type_ == "arg" then
         result[target] = data
      elseif type_ == "multiarg" or type_ == "multicount" then
         table.insert(result[target], data)
      elseif type_ == "twodimensional" then
         table.insert(result[target][#result[target]], data)
      end

      if passed[element] == element._maxargs then
         close(element)
      end
   end

   local function complete_invocation(element)
      while passed[element] < element._minargs do
         pass(element, element._default)
      end
   end

   function close(element)
      if passed[element] < element._minargs then
         if element._default and element._defmode:find "a" then
            complete_invocation(element)
         else
            error_("too few arguments")
         end
      else
         if element == cur_option then
            cur_option = nil
         elseif element == cur_arg then
            cur_arg_i = cur_arg_i+1
            cur_arg = arguments[cur_arg_i]
         end
      end
   end

   local function switch(p)
      parser = p

      for _, option in ipairs(parser._options) do
         table.insert(options, option)

         for _, alias in ipairs(option._aliases) do
            opt_context[alias] = option
         end

         local type_ = option:_get_type()
         targets[option] = option:_get_target()

         if type_ == "counter" then
            result[targets[option]] = 0
         elseif type_ == "multicount" or type_ == "twodimensional" then
            result[targets[option]] = {}
         end

         invocations[option] = 0
      end

      for _, mutex in ipairs(parser._mutexes) do
         for _, option in ipairs(mutex) do
            if not option_mutexes[option] then
               option_mutexes[option] = {mutex}
            else
               table.insert(option_mutexes[option], mutex)
            end
         end
      end

      for _, argument in ipairs(parser._arguments) do
         table.insert(arguments, argument)
         invocations[argument] = 0
         targets[argument] = argument._target or argument._name
         invoke(argument)
      end

      cur_arg = arguments[cur_arg_i]
      commands = parser._commands
      com_context = {}

      for _, command in ipairs(commands) do
         targets[command] = command._target or command._name

         for _, alias in ipairs(command._aliases) do
            com_context[alias] = command
         end
      end
   end

   local function get_option(name)
      return assert_(opt_context[name], "unknown option '%s'%s", name, get_tip(opt_context, name))
   end

   local function do_action(element)
      if element._action then
         element._action()
      end
   end

   local function handle_argument(data)
      if cur_option then
         pass(cur_option, data)
      elseif cur_arg then
         pass(cur_arg, data)
      else
         local com = com_context[data]

         if not com then
            if #commands > 0 then
               error_("unknown command '%s'%s", data, get_tip(com_context, data))
            else
               error_("too many arguments")
            end
         else
            result[targets[com]] = true
            do_action(com)
            switch(com)
         end
      end
   end

   local function handle_option(data)
      if cur_option then
         close(cur_option)
      end

      cur_option = opt_context[data]

      if option_mutexes[cur_option] then
         for _, mutex in ipairs(option_mutexes[cur_option]) do
            if used_mutexes[mutex] and used_mutexes[mutex] ~= cur_option then
               error_("option '%s' can not be used together with option '%s'", data, used_mutexes[mutex]._name)
            else
               used_mutexes[mutex] = cur_option
            end
         end
      end

      do_action(cur_option)
      invoke(cur_option)
   end

   local function mainloop()
      local handle_options = true

      for _, data in ipairs(args) do
         local plain = true
         local first, name, option

         if handle_options then
            first = data:sub(1, 1)
            if charset[first] then
               if #data > 1 then
                  plain = false
                  if data:sub(2, 2) == first then
                     if #data == 2 then
                        if cur_option then
                           close(cur_option)
                        end

                        handle_options = false
                     else
                        local equal = data:find "="
                        if equal then
                           name = data:sub(1, equal-1)
                           option = get_option(name)
                           assert_(option._maxargs > 0, "option '%s' does not take arguments", name)

                           handle_option(data:sub(1, equal-1))
                           handle_argument(data:sub(equal+1))
                        else
                           get_option(data)
                           handle_option(data)
                        end
                     end
                  else
                     for i = 2, #data do
                        name = first .. data:sub(i, i)
                        option = get_option(name)
                        handle_option(name)

                        if i ~= #data and option._minargs > 0 then
                           handle_argument(data:sub(i+1))
                           break
                        end
                     end
                  end
               end
            end
         end

         if plain then
            handle_argument(data)
         end
      end
   end

   switch(self)
   charset = parser:_update_charset()
   mainloop()

   if cur_option then
      close(cur_option)
   end

   while cur_arg do
      if passed[cur_arg] == 0 and cur_arg._default and cur_arg._defmode:find "u" then
         complete_invocation(cur_arg)
      else
         close(cur_arg)
      end
   end

   if parser._require_command and #commands > 0 then
      error_("a command is required")
   end

   for _, option in ipairs(options) do
      if invocations[option] == 0 then
         if option._default and option._defmode:find "u" then
            invoke(option)
            complete_invocation(option)
            close(option)
         end
      end

      if invocations[option] < option._mincount then
         if option._default and option._defmode:find "a" then
            while invocations[option] < option._mincount do
               invoke(option)
               close(option)
            end
         else
            error_("option '%s' must be used at least %d time%s", option._name, option._mincount, plural(option._mincount))
         end
      end
   end

   return result
end

function Parser:error(msg)
   if _TEST then
      error(msg)
   else
      io.stderr:write(("%s\r\n\r\nError: %s\r\n"):format(self:get_usage(), msg))
      os.exit(1)
   end
end

function Parser:parse(args)
   return self:_parse(args, Parser.error)
end

function Parser:pparse(args)
   local errmsg
   local ok, result = pcall(function()
      return self:_parse(args, function(parser, err)
         errmsg = err
         return error()
      end)
   end)

   if ok then
      return true, result
   else
      assert(errmsg, result)
      return false, errmsg
   end
end

return function(...)
   return Parser(default_cmdline[0]):add_help(true)(...)
end

Added lib/dkjson.lua.























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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    -- Module options:
    local always_try_using_lpeg = true
    local register_global_module_table = false
    local global_module_name = 'json'

    --[==[

David Kolf's JSON module for Lua 5.1/5.2
========================================

*Version 2.4*

In the default configuration this module writes no global values, not even
the module table. Import it using

    json = require ("dkjson")

In environments where `require` or a similiar function are not available
and you cannot receive the return value of the module, you can set the
option `register_global_module_table` to `true`.  The module table will
then be saved in the global variable with the name given by the option
`global_module_name`.

Exported functions and values:

`json.encode (object [, state])`
--------------------------------

Create a string representing the object. `Object` can be a table,
a string, a number, a boolean, `nil`, `json.null` or any object with
a function `__tojson` in its metatable. A table can only use strings
and numbers as keys and its values have to be valid objects as
well. It raises an error for any invalid data types or reference
cycles.

`state` is an optional table with the following fields:

  - `indent`  
    When `indent` (a boolean) is set, the created string will contain
    newlines and indentations. Otherwise it will be one long line.
  - `keyorder`  
    `keyorder` is an array to specify the ordering of keys in the
    encoded output. If an object has keys which are not in this array
    they are written after the sorted keys.
  - `level`  
    This is the initial level of indentation used when `indent` is
    set. For each level two spaces are added. When absent it is set
    to 0.
  - `buffer`  
    `buffer` is an array to store the strings for the result so they
    can be concatenated at once. When it isn't given, the encode
    function will create it temporary and will return the
    concatenated result.
  - `bufferlen`  
    When `bufferlen` is set, it has to be the index of the last
    element of `buffer`.
  - `tables`  
    `tables` is a set to detect reference cycles. It is created
    temporary when absent. Every table that is currently processed
    is used as key, the value is `true`.

When `state.buffer` was set, the return value will be `true` on
success. Without `state.buffer` the return value will be a string.

`json.decode (string [, position [, null]])`
--------------------------------------------

Decode `string` starting at `position` or at 1 if `position` was
omitted.

`null` is an optional value to be returned for null values. The
default is `nil`, but you could set it to `json.null` or any other
value.

The return values are the object or `nil`, the position of the next
character that doesn't belong to the object, and in case of errors
an error message.

Two metatables are created. Every array or object that is decoded gets
a metatable with the `__jsontype` field set to either `array` or
`object`. If you want to provide your own metatables use the syntax

    json.decode (string, position, null, objectmeta, arraymeta)

To prevent the assigning of metatables pass `nil`:

    json.decode (string, position, null, nil)

`<metatable>.__jsonorder`
-------------------------

`__jsonorder` can overwrite the `keyorder` for a specific table.

`<metatable>.__jsontype`
------------------------

`__jsontype` can be either `"array"` or `"object"`. This value is only
checked for empty tables. (The default for empty tables is `"array"`).

`<metatable>.__tojson (self, state)`
------------------------------------

You can provide your own `__tojson` function in a metatable. In this
function you can either add directly to the buffer and return true,
or you can return a string. On errors nil and a message should be
returned.

`json.null`
-----------

You can use this value for setting explicit `null` values.

`json.version`
--------------

Set to `"dkjson 2.4"`.

`json.quotestring (string)`
---------------------------

Quote a UTF-8 string and escape critical characters using JSON
escape sequences. This function is only necessary when you build
your own `__tojson` functions.

`json.addnewline (state)`
-------------------------

When `state.indent` is set, add a newline to `state.buffer` and spaces
according to `state.level`.

LPeg support
------------

When the local configuration variable `always_try_using_lpeg` is set,
this module tries to load LPeg to replace the `decode` function. The
speed increase is significant. You can get the LPeg module at
  <http://www.inf.puc-rio.br/~roberto/lpeg/>.
When LPeg couldn't be loaded, the pure Lua functions stay active.

In case you don't want this module to require LPeg on its own,
disable the option `always_try_using_lpeg` in the options section at
the top of the module.

In this case you can later load LPeg support using

### `json.use_lpeg ()`

Require the LPeg module and replace the functions `quotestring` and
and `decode` with functions that use LPeg patterns.
This function returns the module table, so you can load the module
using:

    json = require "dkjson".use_lpeg()

Alternatively you can use `pcall` so the JSON module still works when
LPeg isn't found.

    json = require "dkjson"
    pcall (json.use_lpeg)

### `json.using_lpeg`

This variable is set to `true` when LPeg was loaded successfully.

---------------------------------------------------------------------

Contact
-------

You can contact the author by sending an e-mail to 'david' at the
domain 'dkolf.de'.

---------------------------------------------------------------------

*Copyright (C) 2010-2013 David Heiko Kolf*

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

<!-- This documentation can be parsed using Markdown to generate HTML.
     The source code is enclosed in a HTML comment so it won't be displayed
     by browsers, but it should be removed from the final HTML file as
     it isn't a valid HTML comment (and wastes space).
  -->

<!--]==]

-- global dependencies:
local pairs, type, tostring, tonumber, getmetatable, setmetatable, rawset =
      pairs, type, tostring, tonumber, getmetatable, setmetatable, rawset
local error, require, pcall, select = error, require, pcall, select
local floor, huge = math.floor, math.huge
local strrep, gsub, strsub, strbyte, strchar, strfind, strlen, strformat =
      string.rep, string.gsub, string.sub, string.byte, string.char,
      string.find, string.len, string.format
local strmatch = string.match
local concat = table.concat

local json = { version = "dkjson 2.4" }

if register_global_module_table then
  _G[global_module_name] = json
end

local _ENV = nil -- blocking globals in Lua 5.2

pcall (function()
  -- Enable access to blocked metatables.
  -- Don't worry, this module doesn't change anything in them.
  local debmeta = require "debug".getmetatable
  if debmeta then getmetatable = debmeta end
end)

json.null = setmetatable ({}, {
  __tojson = function () return "null" end
})

local function isarray (tbl)
  local max, n, arraylen = 0, 0, 0
  for k,v in pairs (tbl) do
    if k == 'n' and type(v) == 'number' then
      arraylen = v
      if v > max then
        max = v
      end
    else
      if type(k) ~= 'number' or k < 1 or floor(k) ~= k then
        return false
      end
      if k > max then
        max = k
      end
      n = n + 1
    end
  end
  if max > 10 and max > arraylen and max > n * 2 then
    return false -- don't create an array with too many holes
  end
  return true, max
end

local escapecodes = {
  ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b", ["\f"] = "\\f",
  ["\n"] = "\\n",  ["\r"] = "\\r",  ["\t"] = "\\t"
}

local function escapeutf8 (uchar)
  local value = escapecodes[uchar]
  if value then
    return value
  end
  local a, b, c, d = strbyte (uchar, 1, 4)
  a, b, c, d = a or 0, b or 0, c or 0, d or 0
  if a <= 0x7f then
    value = a
  elseif 0xc0 <= a and a <= 0xdf and b >= 0x80 then
    value = (a - 0xc0) * 0x40 + b - 0x80
  elseif 0xe0 <= a and a <= 0xef and b >= 0x80 and c >= 0x80 then
    value = ((a - 0xe0) * 0x40 + b - 0x80) * 0x40 + c - 0x80
  elseif 0xf0 <= a and a <= 0xf7 and b >= 0x80 and c >= 0x80 and d >= 0x80 then
    value = (((a - 0xf0) * 0x40 + b - 0x80) * 0x40 + c - 0x80) * 0x40 + d - 0x80
  else
    return ""
  end
  if value <= 0xffff then
    return strformat ("\\u%.4x", value)
  elseif value <= 0x10ffff then
    -- encode as UTF-16 surrogate pair
    value = value - 0x10000
    local highsur, lowsur = 0xD800 + floor (value/0x400), 0xDC00 + (value % 0x400)
    return strformat ("\\u%.4x\\u%.4x", highsur, lowsur)
  else
    return ""
  end
end

local function fsub (str, pattern, repl)
  -- gsub always builds a new string in a buffer, even when no match
  -- exists. First using find should be more efficient when most strings
  -- don't contain the pattern.
  if strfind (str, pattern) then
    return gsub (str, pattern, repl)
  else
    return str
  end
end

local function quotestring (value)
  -- based on the regexp "escapable" in https://github.com/douglascrockford/JSON-js
  value = fsub (value, "[%z\1-\31\"\\\127]", escapeutf8)
  if strfind (value, "[\194\216\220\225\226\239]") then
    value = fsub (value, "\194[\128-\159\173]", escapeutf8)
    value = fsub (value, "\216[\128-\132]", escapeutf8)
    value = fsub (value, "\220\143", escapeutf8)
    value = fsub (value, "\225\158[\180\181]", escapeutf8)
    value = fsub (value, "\226\128[\140-\143\168-\175]", escapeutf8)
    value = fsub (value, "\226\129[\160-\175]", escapeutf8)
    value = fsub (value, "\239\187\191", escapeutf8)
    value = fsub (value, "\239\191[\176-\191]", escapeutf8)
  end
  return "\"" .. value .. "\""
end
json.quotestring = quotestring

local function replace(str, o, n)
  local i, j = strfind (str, o, 1, true)
  if i then
    return strsub(str, 1, i-1) .. n .. strsub(str, j+1, -1)
  else
    return str
  end
end

-- locale independent num2str and str2num functions
local decpoint, numfilter

local function updatedecpoint ()
  decpoint = strmatch(tostring(0.5), "([^05+])")
  -- build a filter that can be used to remove group separators
  numfilter = "[^0-9%-%+eE" .. gsub(decpoint, "[%^%$%(%)%%%.%[%]%*%+%-%?]", "%%%0") .. "]+"
end

updatedecpoint()

local function num2str (num)
  return replace(fsub(tostring(num), numfilter, ""), decpoint, ".")
end

local function str2num (str)
  local num = tonumber(replace(str, ".", decpoint))
  if not num then
    updatedecpoint()
    num = tonumber(replace(str, ".", decpoint))
  end
  return num
end

local function addnewline2 (level, buffer, buflen)
  buffer[buflen+1] = "\n"
  buffer[buflen+2] = strrep ("  ", level)
  buflen = buflen + 2
  return buflen
end

function json.addnewline (state)
  if state.indent then
    state.bufferlen = addnewline2 (state.level or 0,
                           state.buffer, state.bufferlen or #(state.buffer))
  end
end

local encode2 -- forward declaration

local function addpair (key, value, prev, indent, level, buffer, buflen, tables, globalorder)
  local kt = type (key)
  if kt ~= 'string' and kt ~= 'number' then
    return nil, "type '" .. kt .. "' is not supported as a key by JSON."
  end
  if prev then
    buflen = buflen + 1
    buffer[buflen] = ","
  end
  if indent then
    buflen = addnewline2 (level, buffer, buflen)
  end
  buffer[buflen+1] = quotestring (key)
  buffer[buflen+2] = ":"
  return encode2 (value, indent, level, buffer, buflen + 2, tables, globalorder)
end

encode2 = function (value, indent, level, buffer, buflen, tables, globalorder)
  local valtype = type (value)
  local valmeta = getmetatable (value)
  valmeta = type (valmeta) == 'table' and valmeta -- only tables
  local valtojson = valmeta and valmeta.__tojson
  if valtojson then
    if tables[value] then
      return nil, "reference cycle"
    end
    tables[value] = true
    local state = {
        indent = indent, level = level, buffer = buffer,
        bufferlen = buflen, tables = tables, keyorder = globalorder
    }
    local ret, msg = valtojson (value, state)
    if not ret then return nil, msg end
    tables[value] = nil
    buflen = state.bufferlen
    if type (ret) == 'string' then
      buflen = buflen + 1
      buffer[buflen] = ret
    end
  elseif value == nil then
    buflen = buflen + 1
    buffer[buflen] = "null"
  elseif valtype == 'number' then
    local s
    if value ~= value or value >= huge or -value >= huge then
      -- This is the behaviour of the original JSON implementation.
      s = "null"
    else
      s = num2str (value)
    end
    buflen = buflen + 1
    buffer[buflen] = s
  elseif valtype == 'boolean' then
    buflen = buflen + 1
    buffer[buflen] = value and "true" or "false"
  elseif valtype == 'string' then
    buflen = buflen + 1
    buffer[buflen] = quotestring (value)
  elseif valtype == 'table' then
    if tables[value] then
      return nil, "reference cycle"
    end
    tables[value] = true
    level = level + 1
    local isa, n = isarray (value)
    if n == 0 and valmeta and valmeta.__jsontype == 'object' then
      isa = false
    end
    local msg
    if isa then -- JSON array
      buflen = buflen + 1
      buffer[buflen] = "["
      for i = 1, n do
        buflen, msg = encode2 (value[i], indent, level, buffer, buflen, tables, globalorder)
        if not buflen then return nil, msg end
        if i < n then
          buflen = buflen + 1
          buffer[buflen] = ","
        end
      end
      buflen = buflen + 1
      buffer[buflen] = "]"
    else -- JSON object
      local prev = false
      buflen = buflen + 1
      buffer[buflen] = "{"
      local order = valmeta and valmeta.__jsonorder or globalorder
      if order then
        local used = {}
        n = #order
        for i = 1, n do
          local k = order[i]
          local v = value[k]
          if v then
            used[k] = true
            buflen, msg = addpair (k, v, prev, indent, level, buffer, buflen, tables, globalorder)
            prev = true -- add a seperator before the next element
          end
        end
        for k,v in pairs (value) do
          if not used[k] then
            buflen, msg = addpair (k, v, prev, indent, level, buffer, buflen, tables, globalorder)
            if not buflen then return nil, msg end
            prev = true -- add a seperator before the next element
          end
        end
      else -- unordered
        for k,v in pairs (value) do
          buflen, msg = addpair (k, v, prev, indent, level, buffer, buflen, tables, globalorder)
          if not buflen then return nil, msg end
          prev = true -- add a seperator before the next element
        end
      end
      if indent then
        buflen = addnewline2 (level - 1, buffer, buflen)
      end
      buflen = buflen + 1
      buffer[buflen] = "}"
    end
    tables[value] = nil
  else
    return nil, "type '" .. valtype .. "' is not supported by JSON."
  end
  return buflen
end

function json.encode (value, state)
  state = state or {}
  local oldbuffer = state.buffer
  local buffer = oldbuffer or {}
  updatedecpoint()
  local ret, msg = encode2 (value, state.indent, state.level or 0,
                   buffer, state.bufferlen or 0, state.tables or {}, state.keyorder)
  if not ret then
    error (msg, 2)
  elseif oldbuffer then
    state.bufferlen = ret
    return true
  else
    return concat (buffer)
  end
end

local function loc (str, where)
  local line, pos, linepos = 1, 1, 0
  while true do
    pos = strfind (str, "\n", pos, true)
    if pos and pos < where then
      line = line + 1
      linepos = pos
      pos = pos + 1
    else
      break
    end
  end
  return "line " .. line .. ", column " .. (where - linepos)
end

local function unterminated (str, what, where)
  return nil, strlen (str) + 1, "unterminated " .. what .. " at " .. loc (str, where)
end

local function scanwhite (str, pos)
  while true do
    pos = strfind (str, "%S", pos)
    if not pos then return nil end
    if strsub (str, pos, pos + 2) == "\239\187\191" then
      -- UTF-8 Byte Order Mark
      pos = pos + 3
    else
      return pos
    end
  end
end

local escapechars = {
  ["\""] = "\"", ["\\"] = "\\", ["/"] = "/", ["b"] = "\b", ["f"] = "\f",
  ["n"] = "\n", ["r"] = "\r", ["t"] = "\t"
}

local function unichar (value)
  if value < 0 then
    return nil
  elseif value <= 0x007f then
    return strchar (value)
  elseif value <= 0x07ff then
    return strchar (0xc0 + floor(value/0x40),
                    0x80 + (floor(value) % 0x40))
  elseif value <= 0xffff then
    return strchar (0xe0 + floor(value/0x1000),
                    0x80 + (floor(value/0x40) % 0x40),
                    0x80 + (floor(value) % 0x40))
  elseif value <= 0x10ffff then
    return strchar (0xf0 + floor(value/0x40000),
                    0x80 + (floor(value/0x1000) % 0x40),
                    0x80 + (floor(value/0x40) % 0x40),
                    0x80 + (floor(value) % 0x40))
  else
    return nil
  end
end

local function scanstring (str, pos)
  local lastpos = pos + 1
  local buffer, n = {}, 0
  while true do
    local nextpos = strfind (str, "[\"\\]", lastpos)
    if not nextpos then
      return unterminated (str, "string", pos)
    end
    if nextpos > lastpos then
      n = n + 1
      buffer[n] = strsub (str, lastpos, nextpos - 1)
    end
    if strsub (str, nextpos, nextpos) == "\"" then
      lastpos = nextpos + 1
      break
    else
      local escchar = strsub (str, nextpos + 1, nextpos + 1)
      local value
      if escchar == "u" then
        value = tonumber (strsub (str, nextpos + 2, nextpos + 5), 16)
        if value then
          local value2
          if 0xD800 <= value and value <= 0xDBff then
            -- we have the high surrogate of UTF-16. Check if there is a
            -- low surrogate escaped nearby to combine them.
            if strsub (str, nextpos + 6, nextpos + 7) == "\\u" then
              value2 = tonumber (strsub (str, nextpos + 8, nextpos + 11), 16)
              if value2 and 0xDC00 <= value2 and value2 <= 0xDFFF then
                value = (value - 0xD800)  * 0x400 + (value2 - 0xDC00) + 0x10000
              else
                value2 = nil -- in case it was out of range for a low surrogate
              end
            end
          end
          value = value and unichar (value)
          if value then
            if value2 then
              lastpos = nextpos + 12
            else
              lastpos = nextpos + 6
            end
          end
        end
      end
      if not value then
        value = escapechars[escchar] or escchar
        lastpos = nextpos + 2
      end
      n = n + 1
      buffer[n] = value
    end
  end
  if n == 1 then
    return buffer[1], lastpos
  elseif n > 1 then
    return concat (buffer), lastpos
  else
    return "", lastpos
  end
end

local scanvalue -- forward declaration

local function scantable (what, closechar, str, startpos, nullval, objectmeta, arraymeta)
  local len = strlen (str)
  local tbl, n = {}, 0
  local pos = startpos + 1
  if what == 'object' then
    setmetatable (tbl, objectmeta)
  else
    setmetatable (tbl, arraymeta)
  end
  while true do
    pos = scanwhite (str, pos)
    if not pos then return unterminated (str, what, startpos) end
    local char = strsub (str, pos, pos)
    if char == closechar then
      return tbl, pos + 1
    end
    local val1, err
    val1, pos, err = scanvalue (str, pos, nullval, objectmeta, arraymeta)
    if err then return nil, pos, err end
    pos = scanwhite (str, pos)
    if not pos then return unterminated (str, what, startpos) end
    char = strsub (str, pos, pos)
    if char == ":" then
      if val1 == nil then
        return nil, pos, "cannot use nil as table index (at " .. loc (str, pos) .. ")"
      end
      pos = scanwhite (str, pos + 1)
      if not pos then return unterminated (str, what, startpos) end
      local val2
      val2, pos, err = scanvalue (str, pos, nullval, objectmeta, arraymeta)
      if err then return nil, pos, err end
      tbl[val1] = val2
      pos = scanwhite (str, pos)
      if not pos then return unterminated (str, what, startpos) end
      char = strsub (str, pos, pos)
    else
      n = n + 1
      tbl[n] = val1
    end
    if char == "," then
      pos = pos + 1
    end
  end
end

scanvalue = function (str, pos, nullval, objectmeta, arraymeta)
  pos = pos or 1
  pos = scanwhite (str, pos)
  if not pos then
    return nil, strlen (str) + 1, "no valid JSON value (reached the end)"
  end
  local char = strsub (str, pos, pos)
  if char == "{" then
    return scantable ('object', "}", str, pos, nullval, objectmeta, arraymeta)
  elseif char == "[" then
    return scantable ('array', "]", str, pos, nullval, objectmeta, arraymeta)
  elseif char == "\"" then
    return scanstring (str, pos)
  else
    local pstart, pend = strfind (str, "^%-?[%d%.]+[eE]?[%+%-]?%d*", pos)
    if pstart then
      local number = str2num (strsub (str, pstart, pend))
      if number then
        return number, pend + 1
      end
    end
    pstart, pend = strfind (str, "^%a%w*", pos)
    if pstart then
      local name = strsub (str, pstart, pend)
      if name == "true" then
        return true, pend + 1
      elseif name == "false" then
        return false, pend + 1
      elseif name == "null" then
        return nullval, pend + 1
      end
    end
    return nil, pos, "no valid JSON value at " .. loc (str, pos)
  end
end

local function optionalmetatables(...)
  if select("#", ...) > 0 then
    return ...
  else
    return {__jsontype = 'object'}, {__jsontype = 'array'}
  end
end

function json.decode (str, pos, nullval, ...)
  local objectmeta, arraymeta = optionalmetatables(...)
  return scanvalue (str, pos, nullval, objectmeta, arraymeta)
end

function json.use_lpeg ()
  local g = require ("lpeg")

  if g.version() == "0.11" then
    error "due to a bug in LPeg 0.11, it cannot be used for JSON matching"
  end

  local pegmatch = g.match
  local P, S, R = g.P, g.S, g.R

  local function ErrorCall (str, pos, msg, state)
    if not state.msg then
      state.msg = msg .. " at " .. loc (str, pos)
      state.pos = pos
    end
    return false
  end

  local function Err (msg)
    return g.Cmt (g.Cc (msg) * g.Carg (2), ErrorCall)
  end

  local Space = (S" \n\r\t" + P"\239\187\191")^0

  local PlainChar = 1 - S"\"\\\n\r"
  local EscapeSequence = (P"\\" * g.C (S"\"\\/bfnrt" + Err "unsupported escape sequence")) / escapechars
  local HexDigit = R("09", "af", "AF")
  local function UTF16Surrogate (match, pos, high, low)
    high, low = tonumber (high, 16), tonumber (low, 16)
    if 0xD800 <= high and high <= 0xDBff and 0xDC00 <= low and low <= 0xDFFF then
      return true, unichar ((high - 0xD800)  * 0x400 + (low - 0xDC00) + 0x10000)
    else
      return false
    end
  end
  local function UTF16BMP (hex)
    return unichar (tonumber (hex, 16))
  end
  local U16Sequence = (P"\\u" * g.C (HexDigit * HexDigit * HexDigit * HexDigit))
  local UnicodeEscape = g.Cmt (U16Sequence * U16Sequence, UTF16Surrogate) + U16Sequence/UTF16BMP
  local Char = UnicodeEscape + EscapeSequence + PlainChar
  local String = P"\"" * g.Cs (Char ^ 0) * (P"\"" + Err "unterminated string")
  local Integer = P"-"^(-1) * (P"0" + (R"19" * R"09"^0))
  local Fractal = P"." * R"09"^0
  local Exponent = (S"eE") * (S"+-")^(-1) * R"09"^1
  local Number = (Integer * Fractal^(-1) * Exponent^(-1))/str2num
  local Constant = P"true" * g.Cc (true) + P"false" * g.Cc (false) + P"null" * g.Carg (1)
  local SimpleValue = Number + String + Constant
  local ArrayContent, ObjectContent

  -- The functions parsearray and parseobject parse only a single value/pair
  -- at a time and store them directly to avoid hitting the LPeg limits.
  local function parsearray (str, pos, nullval, state)
    local obj, cont
    local npos
    local t, nt = {}, 0
    repeat
      obj, cont, npos = pegmatch (ArrayContent, str, pos, nullval, state)
      if not npos then break end
      pos = npos
      nt = nt + 1
      t[nt] = obj
    until cont == 'last'
    return pos, setmetatable (t, state.arraymeta)
  end

  local function parseobject (str, pos, nullval, state)
    local obj, key, cont
    local npos
    local t = {}
    repeat
      key, obj, cont, npos = pegmatch (ObjectContent, str, pos, nullval, state)
      if not npos then break end
      pos = npos
      t[key] = obj
    until cont == 'last'
    return pos, setmetatable (t, state.objectmeta)
  end

  local Array = P"[" * g.Cmt (g.Carg(1) * g.Carg(2), parsearray) * Space * (P"]" + Err "']' expected")
  local Object = P"{" * g.Cmt (g.Carg(1) * g.Carg(2), parseobject) * Space * (P"}" + Err "'}' expected")
  local Value = Space * (Array + Object + SimpleValue)
  local ExpectedValue = Value + Space * Err "value expected"
  ArrayContent = Value * Space * (P"," * g.Cc'cont' + g.Cc'last') * g.Cp()
  local Pair = g.Cg (Space * String * Space * (P":" + Err "colon expected") * ExpectedValue)
  ObjectContent = Pair * Space * (P"," * g.Cc'cont' + g.Cc'last') * g.Cp()
  local DecodeValue = ExpectedValue * g.Cp ()

  function json.decode (str, pos, nullval, ...)
    local state = {}
    state.objectmeta, state.arraymeta = optionalmetatables(...)
    local obj, retpos = pegmatch (DecodeValue, str, pos, nullval, state)
    if state.msg then
      return nil, state.pos, state.msg
    else
      return obj, retpos
    end
  end

  -- use this function only once:
  json.use_lpeg = function () return json end

  json.using_lpeg = true

  return json -- so you can get the module using json = require "dkjson".use_lpeg()
end

if always_try_using_lpeg then
  pcall (json.use_lpeg)
end

return json

-->

Changes to lib/xmlcodec.lua.

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		-- push(current.kids,{type='comment',name='#comment',value=value,parent=rich and current or nil})
	end,
	pi = function(name,value)
		-- push(current.kids,{type='pi',name=name,value=value,parent=rich and current or nil})
	end
}

function xmlcodec.parse(txt)
	current.elem = nil
	current.root = nil
	current.stack = {}

	parser:parse(txt, {stripWhitespace=true})
	return current.root
end

return xmlcodec







|



>





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		-- push(current.kids,{type='comment',name='#comment',value=value,parent=rich and current or nil})
	end,
	pi = function(name,value)
		-- push(current.kids,{type='pi',name=name,value=value,parent=rich and current or nil})
	end
}

function xmlcodec.parse(txt, options)
	current.elem = nil
	current.root = nil
	current.stack = {}
	current.opts = options or {}
	parser:parse(txt, {stripWhitespace=true})
	return current.root
end

return xmlcodec

Added pandoc/sample.lua.









































































































































































































































































































































































































































































































































































































































































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-- This is a sample custom writer for pandoc.  It produces output
-- that is very similar to that of pandoc's HTML writer.
-- There is one new feature: code blocks marked with class 'dot'
-- are piped through graphviz and images are included in the HTML
-- output using 'data:' URLs.
--
-- Invoke with: pandoc -t sample.lua
--
-- Note:  you need not have lua installed on your system to use this
-- custom writer.  However, if you do have lua installed, you can
-- use it to test changes to the script.  'lua sample.lua' will
-- produce informative error messages if your code contains
-- syntax errors.

-- Character escaping
local function escape(s, in_attribute)
  return s:gsub("[<>&\"']",
    function(x)
      if x == '<' then
        return '&lt;'
      elseif x == '>' then
        return '&gt;'
      elseif x == '&' then
        return '&amp;'
      elseif x == '"' then
        return '&quot;'
      elseif x == "'" then
        return '&#39;'
      else
        return x
      end
    end)
end

-- Helper function to convert an attributes table into
-- a string that can be put into HTML tags.
local function attributes(attr)
  local attr_table = {}
  for x,y in pairs(attr) do
    if y and y ~= "" then
      table.insert(attr_table, ' ' .. x .. '="' .. escape(y,true) .. '"')
    end
  end
  return table.concat(attr_table)
end

-- Run cmd on a temporary file containing inp and return result.
local function pipe(cmd, inp)
  local tmp = os.tmpname()
  local tmph = io.open(tmp, "w")
  tmph:write(inp)
  tmph:close()
  local outh = io.popen(cmd .. " " .. tmp,"r")
  local result = outh:read("*all")
  outh:close()
  os.remove(tmp)
  return result
end

-- Table to store footnotes, so they can be included at the end.
local notes = {}

-- Blocksep is used to separate block elements.
function Blocksep()
  return "\n\n"
end

-- This function is called once for the whole document. Parameters:
-- body is a string, metadata is a table, variables is a table.
-- One could use some kind of templating
-- system here; this just gives you a simple standalone HTML file.
function Doc(body, metadata, variables)
  local buffer = {}
  local function add(s)
    table.insert(buffer, s)
  end
  add('<!DOCTYPE html>')
  add('<html>')
  add('<head>')
  add('<title>' .. (metadata['title'] or '') .. '</title>')
  add('</head>')
  add('<body>')
  if metadata['title'] and metadata['title'] ~= "" then
    add('<h1 class="title">' .. metadata['title'] .. '</h1>')
  end
  for _, author in pairs(metadata['author'] or {}) do
    add('<h2 class="author">' .. author .. '</h2>')
  end
  if metadata['date'] and metadata['date'] ~= "" then
    add('<h3 class="date">' .. metadata.date .. '</h3>')
  end
  add(body)
  if #notes > 0 then
    add('<ol class="footnotes">')
    for _,note in pairs(notes) do
      add(note)
    end
    add('</ol>')
  end
  add('</body>')
  add('</html>')
  return table.concat(buffer,'\n')
end

-- The functions that follow render corresponding pandoc elements.
-- s is always a string, attr is always a table of attributes, and
-- items is always an array of strings (the items in a list).
-- Comments indicate the types of other variables.

function Str(s)
  return escape(s)
end

function Space()
  return " "
end

function LineBreak()
  return "<br/>"
end

function Emph(s)
  return "<em>" .. s .. "</em>"
end

function Strong(s)
  return "<strong>" .. s .. "</strong>"
end

function Subscript(s)
  return "<sub>" .. s .. "</sub>"
end

function Superscript(s)
  return "<sup>" .. s .. "</sup>"
end

function SmallCaps(s)
  return '<span style="font-variant: small-caps;">' .. s .. '</span>'
end

function Strikeout(s)
  return '<del>' .. s .. '</del>'
end

function Link(s, src, tit)
  return "<a href='" .. escape(src,true) .. "' title='" ..
         escape(tit,true) .. "'>" .. s .. "</a>"
end

function Image(s, src, tit)
  return "<img src='" .. escape(src,true) .. "' title='" ..
         escape(tit,true) .. "'/>"
end

function Code(s, attr)
  return "<code" .. attributes(attr) .. ">" .. escape(s) .. "</code>"
end

function InlineMath(s)
  return "\\(" .. escape(s) .. "\\)"
end

function DisplayMath(s)
  return "\\[" .. escape(s) .. "\\]"
end

function Note(s)
  local num = #notes + 1
  -- insert the back reference right before the final closing tag.
  s = string.gsub(s,
          '(.*)</', '%1 <a href="#fnref' .. num ..  '">&#8617;</a></')
  -- add a list item with the note to the note table.
  table.insert(notes, '<li id="fn' .. num .. '">' .. s .. '</li>')
  -- return the footnote reference, linked to the note.
  return '<a id="fnref' .. num .. '" href="#fn' .. num ..
            '"><sup>' .. num .. '</sup></a>'
end

function Span(s, attr)
  return "<span" .. attributes(attr) .. ">" .. s .. "</span>"
end

function Cite(s)
  return "<span class=\"cite\">" .. s .. "</span>"
end

function Plain(s)
  return s
end

function Para(s)
  return "<p>" .. s .. "</p>"
end

-- lev is an integer, the header level.
function Header(lev, s, attr)
  return "<h" .. lev .. attributes(attr) ..  ">" .. s .. "</h" .. lev .. ">"
end

function BlockQuote(s)
  return "<blockquote>\n" .. s .. "\n</blockquote>"
end

function HorizontalRule()
  return "<hr/>"
end

function CodeBlock(s, attr)
  -- If code block has class 'dot', pipe the contents through dot
  -- and base64, and include the base64-encoded png as a data: URL.
  if attr.class and string.match(' ' .. attr.class .. ' ',' dot ') then
    local png = pipe("base64", pipe("dot -Tpng", s))
    return '<img src="data:image/png;base64,' .. png .. '"/>'
  -- otherwise treat as code (one could pipe through a highlighter)
  else
    return "<pre><code" .. attributes(attr) .. ">" .. escape(s) ..
           "</code></pre>"
  end
end

function BulletList(items)
  local buffer = {}
  for _, item in pairs(items) do
    table.insert(buffer, "<li>" .. item .. "</li>")
  end
  return "<ul>\n" .. table.concat(buffer, "\n") .. "\n</ul>"
end

function OrderedList(items)
  local buffer = {}
  for _, item in pairs(items) do
    table.insert(buffer, "<li>" .. item .. "</li>")
  end
  return "<ol>\n" .. table.concat(buffer, "\n") .. "\n</ol>"
end

-- Revisit association list STackValue instance.
function DefinitionList(items)
  local buffer = {}
  for _,item in pairs(items) do
    for k, v in pairs(item) do
      table.insert(buffer,"<dt>" .. k .. "</dt>\n<dd>" ..
                        table.concat(v,"</dd>\n<dd>") .. "</dd>")
    end
  end
  return "<dl>\n" .. table.concat(buffer, "\n") .. "\n</dl>"
end

-- Convert pandoc alignment to something HTML can use.
-- align is AlignLeft, AlignRight, AlignCenter, or AlignDefault.
function html_align(align)
  if align == 'AlignLeft' then
    return 'left'
  elseif align == 'AlignRight' then
    return 'right'
  elseif align == 'AlignCenter' then
    return 'center'
  else
    return 'left'
  end
end

-- Caption is a string, aligns is an array of strings,
-- widths is an array of floats, headers is an array of
-- strings, rows is an array of arrays of strings.
function Table(caption, aligns, widths, headers, rows)
  local buffer = {}
  local function add(s)
    table.insert(buffer, s)
  end
  add("<table>")
  if caption ~= "" then
    add("<caption>" .. caption .. "</caption>")
  end
  if widths and widths[1] ~= 0 then
    for _, w in pairs(widths) do
      add('<col width="' .. string.format("%d%%", w * 100) .. '" />')
    end
  end
  local header_row = {}
  local empty_header = true
  for i, h in pairs(headers) do
    local align = html_align(aligns[i])
    table.insert(header_row,'<th align="' .. align .. '">' .. h .. '</th>')
    empty_header = empty_header and h == ""
  end
  if empty_header then
    head = ""
  else
    add('<tr class="header">')
    for _,h in pairs(header_row) do
      add(h)
    end
    add('</tr>')
  end
  local class = "even"
  for _, row in pairs(rows) do
    class = (class == "even" and "odd") or "even"
    add('<tr class="' .. class .. '">')
    for i,c in pairs(row) do
      add('<td align="' .. html_align(aligns[i]) .. '">' .. c .. '</td>')
    end
    add('</tr>')
  end
  add('</table')
  return table.concat(buffer,'\n')
end

function Div(s, attr)
  return "<div" .. attributes(attr) .. ">\n" .. s .. "</div>"
end

-- The following code will produce runtime warnings when you haven't defined
-- all of the functions you need for the custom writer, so it's useful
-- to include when you're working on a writer.
local meta = {}
meta.__index =
  function(_, key)
    io.stderr:write(string.format("WARNING: Undefined function '%s'\n",key))
    return function() return "" end
  end
setmetatable(_G, meta)

Added pandoc/svidoc.lua.











































































































































































































































































































































































































































































































































































































































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-- This is a sample custom writer for pandoc.  It produces output
-- that is very similar to that of pandoc's HTML writer.
-- There is one new feature: code blocks marked with class 'dot'
-- are piped through graphviz and images are included in the HTML
-- output using 'data:' URLs.
--
-- Invoke with: pandoc -t sample.lua
--
-- Note:  you need not have lua installed on your system to use this
-- custom writer.  However, if you do have lua installed, you can
-- use it to test changes to the script.  'lua sample.lua' will
-- produce informative error messages if your code contains
-- syntax errors.

-- Character escaping
local function escape(s, in_attribute)
  return s:gsub("[<>&\"']",
    function(x)
      if x == '<' then
        return '&lt;'
      elseif x == '>' then
        return '&gt;'
      elseif x == '&' then
        return '&amp;'
      elseif x == '"' then
        return '&quot;'
      elseif x == "'" then
        return '&#39;'
      else
        return x
      end
    end)
end

-- Helper function to convert an attributes table into
-- a string that can be put into HTML tags.
local function attributes(attr)
  local attr_table = {}
  for x,y in pairs(attr) do
    if y and y ~= "" then
      table.insert(attr_table, ' ' .. x .. '="' .. escape(y,true) .. '"')
    end
  end
  return table.concat(attr_table)
end

-- Table to store footnotes, so they can be included at the end.
local notes = {}

-- Blocksep is used to separate block elements.
function Blocksep()
  return "\n\n"
end

-- This function is called once for the whole document. Parameters:
-- body is a string, metadata is a table, variables is a table.
-- One could use some kind of templating
-- system here; this just gives you a simple standalone HTML file.
function Doc(body, metadata, variables)
  local buffer = {}
  local function add(s)
    table.insert(buffer, s)
  end
  add('<!DOCTYPE html>')
  add('<html>')
  add('<head>')
  add('<title>' .. (metadata['title'] or '') .. '</title>')
  for _, author in pairs(metadata['author'] or {}) do
    add('<meta name="author" content="' .. author .. '"/>')
  end
  if metadata['date'] and metadata['date'] ~= "" then
    add('<meta name="date" content="' .. metadata.date .. '"/>')
  end
  add('</head>')
  add('<body>')
  add(body)
  if #notes > 0 then
    add('<ol class="footnotes">')
    for _,note in pairs(notes) do
      add(note)
    end
    add('</ol>')
  end
  add('</body>')
  add('</html>')
  return table.concat(buffer,'\n')
end

-- The functions that follow render corresponding pandoc elements.
-- s is always a string, attr is always a table of attributes, and
-- items is always an array of strings (the items in a list).
-- Comments indicate the types of other variables.

function Str(s)
  return escape(s)
end

function Space()
  return " "
end

function LineBreak()
  return "<br/>"
end

function Emph(s)
  return "<em>" .. s .. "</em>"
end

function Strong(s)
  return "<strong>" .. s .. "</strong>"
end

function Subscript(s)
  return "<sub>" .. s .. "</sub>"
end

function Superscript(s)
  return "<sup>" .. s .. "</sup>"
end

function SmallCaps(s)
  return '<span style="font-variant: small-caps;">' .. s .. '</span>'
end

function Strikeout(s)
  return '<del>' .. s .. '</del>'
end

function Link(s, src, tit)
  return "<a href='" .. escape(src,true) .. "' title='" ..
         escape(tit,true) .. "'>" .. s .. "</a>"
end

function Image(s, src, tit)
  return "<img src='" .. escape(src,true) .. "' title='" ..
         escape(tit,true) .. "'/>"
end

function Code(s, attr)
  return "<code" .. attributes(attr) .. ">" .. escape(s) .. "</code>"
end

function InlineMath(s)
  return "<texmath>" .. escape(s) .. "</texmath>"
end

function DisplayMath(s)
  return "<texmath>" .. escape(s) .. "</texmath>"
end

function Note(s)
  local num = #notes + 1
  -- insert the back reference right before the final closing tag.
  s = string.gsub(s,
          '(.*)</', '%1 <a href="#fnref' .. num ..  '">&#8617;</a></')
  -- add a list item with the note to the note table.
  table.insert(notes, '<li id="fn' .. num .. '">' .. s .. '</li>')
  -- return the footnote reference, linked to the note.
  return '<a id="fnref' .. num .. '" href="#fn' .. num ..
            '"><sup>' .. num .. '</sup></a>'
end

function Span(s, attr)
  return "<span" .. attributes(attr) .. ">" .. s .. "</span>"
end

function Cite(s)
  return "<span class=\"cite\">" .. s .. "</span>"
end

function Plain(s)
  return s
end

function Para(s)
  return "<p>" .. s .. "</p>"
end

-- lev is an integer, the header level.
function Header(lev, s, attr)
  return "<h" .. lev .. attributes(attr) ..  ">" .. s .. "</h" .. lev .. ">"
end

function BlockQuote(s)
  return "<blockquote>\n" .. s .. "\n</blockquote>"
end

function HorizontalRule()
  return "<hr/>"
end

function CodeBlock(s, attr)
 return "<pre ".. attributes(attr) .."><![CDATA[\n"
            .. escape(s) ..
           "\n]]></pre>"
end

function BulletList(items)
  local buffer = {}
  for _, item in pairs(items) do
    table.insert(buffer, "<li>" .. item .. "</li>")
  end
  return "<ul>\n" .. table.concat(buffer, "\n") .. "\n</ul>"
end

function OrderedList(items)
  local buffer = {}
  for _, item in pairs(items) do
    table.insert(buffer, "<li>" .. item .. "</li>")
  end
  return "<ol>\n" .. table.concat(buffer, "\n") .. "\n</ol>"
end

-- Revisit association list STackValue instance.
function DefinitionList(items)
  local buffer = {}
  for _,item in pairs(items) do
    for k, v in pairs(item) do
      table.insert(buffer,"<dt>" .. k .. "</dt>\n<dd>" ..
                        table.concat(v,"</dd>\n<dd>") .. "</dd>")
    end
  end
  return "<dl>\n" .. table.concat(buffer, "\n") .. "\n</dl>"
end

-- Convert pandoc alignment to something HTML can use.
-- align is AlignLeft, AlignRight, AlignCenter, or AlignDefault.
function html_align(align)
  if align == 'AlignLeft' then
    return 'left'
  elseif align == 'AlignRight' then
    return 'right'
  elseif align == 'AlignCenter' then
    return 'center'
  else
    return 'left'
  end
end

-- Caption is a string, aligns is an array of strings,
-- widths is an array of floats, headers is an array of
-- strings, rows is an array of arrays of strings.
function Table(caption, aligns, widths, headers, rows)
  local buffer = {}
  local function add(s)
    table.insert(buffer, s)
  end
  add("<table>")
  if caption ~= "" then
    add("<caption>" .. caption .. "</caption>")
  end
  --[[if widths and widths[1] ~= 0 then
    for _, w in pairs(widths) do
      add('<col width="' .. string.format("%d%%", w * 100) .. '" />')
    end
  end]]
  local header_row = {}
  local empty_header = true
  for i, h in pairs(headers) do
    local align = html_align(aligns[i])
    table.insert(header_row,'<th align="' .. align .. '">' .. h .. '</th>')
    empty_header = empty_header and h == ""
  end
  if empty_header then
    head = ""
  else
    add('<tr class="header">')
    for _,h in pairs(header_row) do
      add(h)
    end
    add('</tr>')
  end
  local class = "even"
  for _, row in pairs(rows) do
    class = (class == "even" and "odd") or "even"
    add('<tr class="' .. class .. '">')
    for i,c in pairs(row) do
      add('<td align="' .. html_align(aligns[i]) .. '">' .. c .. '</td>')
    end
    add('</tr>')
  end
  add('</table')
  return table.concat(buffer,'\n')
end

function Div(s, attr)
  return "<div" .. attributes(attr) .. ">\n" .. s .. "</div>"
end

function RawBlock(fmt, s)
  return s
end

function RawInline(fmt, s)
  return s
end

-- The following code will produce runtime warnings when you haven't defined
-- all of the functions you need for the custom writer, so it's useful
-- to include when you're working on a writer.
local meta = {}
meta.__index =
  function(_, key)
    io.stderr:write(string.format("WARNING: Undefined function '%s'\n",key))
    return function() return "" end
  end
setmetatable(_G, meta)