Class: RiveScript::Brain

Inherits:
Object
  • Object
show all
Defined in:
lib/rivescript/brain.rb

Constant Summary collapse

MAX_REPLY_WEIGHT =

Reply weights above this are clamped to prevent trivially-crafted weight=N tags from ballooning the random-choice bucket.

10_000
BEGIN_OK_TOKEN =

Private-use-area token used to shield a fully-processed inner reply from being tag-processed a second time when substituted into a BEGIN block's ok placeholder.

"\uE000RIVE_OK\uE000"
BEGIN_OK_FORMAT_TAGS =

Simple text-transform tags that are allowed to wrap ok in a BEGIN block (e.g. "uppercaseok/uppercase"). These are resolved against the already-processed inner reply directly (bypassing the tag engine) so the wrapping author's intent is preserved without re-running the full tag processor (with its side-effecting tags) over user-influenced reply text a second time.

%w[person formal sentence uppercase lowercase].freeze
TAGS = 
{
  "bot" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, _user, _scope|
      vars = rive._var
      split = Brain.split_assignment(data)
      if split.length > 1
        vars[split[0].strip] = split[1]
        ""
      elsif split.length == 1
        val = vars[split[0].strip]
        val = "undefined" if val.nil?
        val
      else
        "undefined"
      end
    }
  },
  "env" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, _user, _scope|
      globals = rive._global
      split = Brain.split_assignment(data)
      if split.length > 1
        globals[split[0].strip] = split[1]
        ""
      elsif split.length == 1
        val = globals[split[0].strip]
        val = "undefined" if val.nil?
        val
      else
        "undefined"
      end
    }
  },
  "set" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, user, _scope|
      split = Brain.split_assignment(data)
      rive.set_uservar(user, split[0].strip, split[1]) if split.length > 1
      ""
    }
  },
  "get" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, user, _scope|
      rive.get_uservar(user, data.strip)
    }
  },
  "add" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, user, _scope|
      split = Brain.split_assignment(data)
      name = split[0].strip
      raw_value = split[1]
      existing_value = rive.get_uservar(user, name) || 0
      existing_value = 0 if existing_value == "undefined"
      value = raw_value.nil? ? nil : Brain.parse_int_js(raw_value.strip)
      existing_number = Brain.parse_int_js(existing_value.to_s)
      if value.nil?
        return "[ERR: Math can't 'add' non-numeric value '#{raw_value}']"
      elsif existing_number.nil?
        return "[ERR: Math can't 'add' non-numeric user variable '#{name}']"
      else
        result = existing_number + value
        rive.set_uservar(user, name, result)
      end
      ""
    }
  },
  "sub" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, user, _scope|
      split = Brain.split_assignment(data)
      name = split[0].strip
      raw_value = split[1]
      existing_value = rive.get_uservar(user, name) || 0
      value = raw_value.nil? ? nil : Brain.parse_int_js(raw_value.strip)
      existing_value = 0 if existing_value == "undefined"
      existing_number = Brain.parse_int_js(existing_value.to_s)
      if value.nil?
        return "[ERR: Math can't 'sub' non-numeric value '#{raw_value}']"
      elsif existing_number.nil?
        return "[ERR: Math can't 'sub' non-numeric user variable '#{name}']"
      else
        result = existing_number - value
        rive.set_uservar(user, name, result)
      end
      ""
    }
  },
  "mult" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, user, _scope|
      split = Brain.split_assignment(data)
      name = split[0].strip
      raw_value = split[1]
      existing_value = rive.get_uservar(user, name) || 0
      value = raw_value.nil? ? nil : Brain.parse_int_js(raw_value.strip)
      existing_value = 0 if existing_value == "undefined"
      existing_number = Brain.parse_int_js(existing_value.to_s)
      if value.nil?
        return "[ERR: Math can't 'mult' non-numeric value '#{raw_value}']"
      elsif existing_number.nil?
        return "[ERR: Math can't 'mult' non-numeric user variable '#{name}']"
      else
        result = existing_number * value
        rive.set_uservar(user, name, result)
      end
      ""
    }
  },
  "div" => {
    "self_closing" => true,
    "handle" => lambda { |rive, data, user, _scope|
      split = Brain.split_assignment(data)
      name = split[0].strip
      raw_value = split[1]
      existing_value = rive.get_uservar(user, name) || 0
      value = raw_value.nil? ? nil : Brain.parse_int_js(raw_value.strip)
      existing_value = 0 if existing_value == "undefined"
      existing_number = Brain.parse_int_js(existing_value.to_s)
      if value.nil?
        return "[ERR: Math can't 'div' non-numeric value '#{raw_value}']"
      elsif existing_number.nil?
        return "[ERR: Math can't 'div' non-numeric user variable '#{name}']"
      elsif value == 0
        return "[ERR: Can't Divide By Zero]"
      else
        result = existing_number.fdiv(value)
        result = result.to_i if result == result.to_i
        rive.set_uservar(user, name, result)
      end
      ""
    }
  },
  "call" => {
    "self_closing" => false,
    "handle" => lambda { |rive, data, _user, scope|
      trimmed = Utils.trim(data)
      m = trimmed.match(/\A(\S+)(?:\s+(.*))?\z/m)
      output = rive.errors["objectNotFound"]
      return output unless m

      obj = m[1]
      args = m[2] ? Utils.parse_call_args(m[2]) : []
      objlangs = rive._objlangs
      handlers = rive._handlers

      if objlangs.key?(obj)
        lang = objlangs[obj]
        if handlers[lang]
          begin
            output = handlers[lang].call(rive, obj, args, scope)
          rescue StandardError => e
            rive.brain.warn(e.message) unless e.nil?
            output = "[ERR: Error raised by object macro: #{e.message}]"
          end
        else
          output = "[ERR: No Object Handler]"
        end
      end
      output
    }
  }
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(master) ⇒ Brain

Returns a new instance of Brain.



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# File 'lib/rivescript/brain.rb', line 205

def initialize(master)
  @master = master
  @strict = master._strict
  @utf8 = master._utf8
  @mutex = Mutex.new
end

Class Method Details

.parse_int_js(str) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 27

def self.parse_int_js(str)
  m = str.to_s.strip.match(/\A[-+]?\d+/)
  m ? m[0].to_i : nil
end

.split_assignment(data) ⇒ Object

Splits "name=value" assignment data on the first "=" only, so that values which themselves contain "=" are preserved intact.



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# File 'lib/rivescript/brain.rb', line 34

def self.split_assignment(data)
  data.to_s.split("=", 2)
end

Instance Method Details

#current_user ⇒ Object

The user ID currently being processed by #reply (only meaningful from within object macros invoked during a reply). Stored per-thread so concurrent calls to #reply from different threads don't clobber each other's notion of "the current user".



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# File 'lib/rivescript/brain.rb', line 216

def current_user
  Thread.current[:rivescript_current_user]
end

#format_message(msg, botreply = nil) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 286

def format_message(msg, botreply = nil)
  msg = msg.to_s
  msg = msg.downcase unless case_sensitive?

  msg = substitute(msg, "sub")

  if @utf8
    msg = msg.gsub(/[\\<>]+/, "")

    if !@master.unicode_punctuation.nil?
      msg = msg.gsub(@master.unicode_punctuation, "")
    end

    if !botreply.nil?
      msg = msg.gsub(/[.?,!;:@#$%^&*()]/, "")
    end
  else
    msg = Utils.strip_nasties(msg, @utf8)
  end

  msg.strip.gsub(/\s+/, " ")
end

#handle_tag(rive, user, content, scope, depth) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 417

def handle_tag(rive, user, content, scope, depth)
  tag = ""
  reminder = ""
  i = 0
  while i < content.length
    if TAGS.key?(tag)
      reminder = content[(i + 1)..]
      break
    elsif content[i] == " "
      reminder = content[(i + 1)..]
      break
    elsif content[i] == ">"
      reminder = content[(i + 1)..]
      return { "response" => "<#{tag}>", "reminder" => reminder }
    end
    tag += content[i]
    i += 1
  end

  tag_def = TAGS[tag]
  self_closing = tag_def ? tag_def["self_closing"] : true
  end_tag = self_closing ? ">" : "</#{tag}>"
  result = parse_complex_tags(rive, user, reminder, scope, depth, end_tag)
  reminder = result["reminder"]

  response = if tag_def && tag_def["handle"]
               tag_def["handle"].call(rive, result["response"], user, scope)
             else
               "<#{tag} #{result["response"]}>"
             end
  { "response" => response, "reminder" => reminder }
end

#parse_complex_tags(rive, user, content, scope, depth, end_tag = "") ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 450

def parse_complex_tags(rive, user, content, scope, depth, end_tag = "")
  return { "response" => content, "reminder" => "" } if depth > 50

  response = ""
  reminder = content
  next_tag = reminder.index("<")
  next_end = end_tag.empty? ? reminder.length : (reminder.index(end_tag) || reminder.length)

  while !reminder.empty? && next_tag && next_tag < next_end
    response += reminder[0...next_tag]
    reminder = reminder[(next_tag + 1)..]
    result = handle_tag(rive, user, reminder, scope, depth + 1)
    response += result["response"].to_s
    reminder = result["reminder"].to_s
    next_tag = reminder.index("<")
    next_end = end_tag.empty? ? reminder.length : (reminder.index(end_tag) || reminder.length)
  end

  response += reminder[0...next_end].to_s
  reminder = reminder[(next_end + end_tag.length)..] || ""

  { "response" => response, "reminder" => reminder }
end

#process_tags(user, msg, reply, st, bst, step, scope) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 474

def process_tags(user, msg, reply, st, bst, step, scope)
  stars = [""]
  stars.concat(st)
  botstars = [""]
  botstars.concat(bst)
  stars.push("undefined") if stars.length == 1
  botstars.push("undefined") if botstars.length == 1

  giveup = 0
  while (match = reply.match(/\(@([A-Za-z0-9_]+)\)/i))
    if (giveup += 1) > bot_depth
      warn("Infinite loop looking for arrays in reply!")
      break
    end

    name = match[1]
    arrays = bot_array
    result = if arrays[name]
               "{random}#{arrays[name].join("|")}{/random}"
             else
               "\x00@#{name}\x00"
             end

    reply = reply.sub(/\(@#{Regexp.escape(name)}\)/i, result)
  end

  reply = reply.gsub(/\x00@([A-Za-z0-9_]+)\x00/, '(@\1)')

  reply = reply.gsub(/<person>/i, "{person}<star>{/person}")
  reply = reply.gsub(/<@>/i, "{@<star>}")
  reply = reply.gsub(/<formal>/i, "{formal}<star>{/formal}")
  reply = reply.gsub(/<sentence>/i, "{sentence}<star>{/sentence}")
  reply = reply.gsub(/<uppercase>/i, "{uppercase}<star>{/uppercase}")
  reply = reply.gsub(/<lowercase>/i, "{lowercase}<star>{/lowercase}")

  reply = reply.gsub(/\{weight=\d+\}/i, "")
  reply = reply.gsub(/<star>/i, stars[1].to_s)
  reply = reply.gsub(/<botstar>/i, botstars[1].to_s)
  (1...stars.length).each do |i|
    reply = reply.gsub(/<star#{i}>/i, stars[i].to_s)
  end
  (1...botstars.length).each do |i|
    reply = reply.gsub(/<botstar#{i}>/i, botstars[i].to_s)
  end

  history = bot_session.get(user, "__history__")
  history = new_history if history == "undefined"
  reply = reply.gsub(/<input>/i, history["input"] ? history["input"][0] : "undefined")
  reply = reply.gsub(/<reply>/i, history["reply"] ? history["reply"][0] : "undefined")
  (1..9).each do |i|
    reply = reply.gsub(/<input#{i}>/i, history["input"][i - 1]) if reply.include?("<input#{i}>")
    reply = reply.gsub(/<reply#{i}>/i, history["reply"][i - 1]) if reply.include?("<reply#{i}>")
  end

  reply = reply.gsub(/<id>/i, user)
  reply = reply.gsub(/\\s/i, " ")
  reply = reply.gsub(/\\n/i, "\n")
  reply = reply.gsub(/\\#/i, "#")

  giveup = 0
  while (match = reply.match(/\{random\}(.+?)\{\/random\}/i))
    if (giveup += 1) > bot_depth
      warn("Infinite loop looking for random tag!")
      break
    end

    text = match[1]
    random = text.include?("|") ? text.split("|") : text.split(" ")
    output = random[(rand * random.length).floor]
    reply = reply.sub(/\{random\}#{Regexp.escape(text)}\{\/random\}/i, output)
  end

  %w[person formal sentence uppercase lowercase].each do |type|
    giveup = 0
    while (match = reply.match(/\{#{type}\}(.+?)\{\/#{type}\}/i))
      giveup += 1
      if giveup >= 50
        warn("Infinite loop looking for #{type} tag!")
        break
      end

      content = match[1]
      replace = if type == "person"
                  substitute(content, "person")
                else
                  Utils.string_format(type, content)
                end

      reply = reply.sub(/\{#{type}\}#{Regexp.escape(content)}\{\/#{type}\}/i, replace)
    end
  end

  reply = parse_complex_tags(@master, user, reply, scope, 0)["response"]

  giveup = 0
  while (match = reply.match(/\{topic=(.+?)\}/i))
    giveup += 1
    if giveup >= 50
      warn("Infinite loop looking for topic tag!")
      break
    end

    name = match[1]
    @master.set_uservar(user, "topic", name)
    reply = reply.sub(/\{topic=#{Regexp.escape(name)}\}/i, "")
  end

  giveup = 0
  while (match = reply.match(/\{@([^\}]*?)\}/))
    giveup += 1
    if giveup >= 50
      warn("Infinite loop looking for redirect tag!")
      break
    end

    target = format_message(Utils.strip(match[1]))
    say("Inline redirection to: #{target}")

    subreply = get_reply(user, target, "normal", step + 1, scope)
    reply = reply.sub(/\{@#{Regexp.escape(match[1])}\}/i, subreply)
  end

  reply
end

#reply(user, msg, scope = nil) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 228

def reply(user, msg, scope = nil)
  @mutex.synchronize do
    say("Asked to reply to [#{user}] #{msg}")

    Thread.current[:rivescript_current_user] = user
    msg = format_message(msg)
    reply = ""

    bot_session.set(user, { "__initialmatch__" => nil })

    if bot_topics["__begin__"]
      begin_reply = get_reply(user, "request", "begin", 0, scope)

      if begin_reply.include?("{ok}")
        inner_reply = get_reply(user, msg, "normal", 0, scope)
        ok_replacement = inner_reply

        BEGIN_OK_FORMAT_TAGS.each do |type|
          wrap_pattern = /\{#{type}\}\{ok\}\{\/#{type}\}/i
          next unless begin_reply.match?(wrap_pattern)

          ok_replacement = type == "person" ? substitute(inner_reply, "person") : Utils.string_format(type, inner_reply)
          begin_reply = begin_reply.gsub(wrap_pattern, BEGIN_OK_TOKEN)
        end

        begin_reply = begin_reply.gsub("{ok}", BEGIN_OK_TOKEN)
        reply = process_tags(user, msg, begin_reply, [], [], 0, scope)
        reply = reply.gsub(BEGIN_OK_TOKEN, ok_replacement)
      else
        reply = process_tags(user, msg, begin_reply, [], [], 0, scope)
      end
    else
      reply = get_reply(user, msg, "normal", 0, scope)
    end

    history = bot_session.get(user, "__history__")
    history = new_history if history == "undefined"
    begin
      history["input"].pop
      history["input"].unshift(msg)
      # Keep %previous intact when nothing matched / no reply was found.
      # Otherwise ERR strings overwrite history.reply[0] and short
      # conversations cannot continue (aichaos/rivescript-js#411).
      unless error_reply?(reply)
        history["reply"].pop
        history["reply"].unshift(reply)
      end
    rescue StandardError
      history = new_history
    end
    bot_session.set(user, { "__history__" => history })

    reply
  end
ensure
  Thread.current[:rivescript_current_user] = nil
end

#say(message) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 220

def say(message)
  @master.send(:say, message)
end

#substitute(msg, type) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 599

def substitute(msg, type)
  sort_key = type == "sub" ? "sub" : "person"
  unless bot_sorted && bot_sorted[sort_key]
    @master.warn("You forgot to call sortReplies()!")
    return msg
  end

  subs = type == "sub" ? bot_sub : bot_person
  maxwords = type == "sub" ? bot_submax : bot_personmax
  result = ""

  pattern = if !@master.unicode_punctuation.nil?
              msg.gsub(@master.unicode_punctuation, "")
            else
              msg.gsub(/[.,!?;:]/, "")
            end

  giveup = 0
  subgiveup = 0

  while pattern.include?(" ")
    giveup += 1
    if giveup >= 1000
      warn("Too many loops when handling substitutions!")
      break
    end

    li = Utils.n_index_of(pattern, " ", maxwords)
    subpattern = pattern[0...li]

    result = subs[subpattern]
    if !result.nil?
      msg = msg.sub(subpattern, result)
    else
      while subpattern.include?(" ")
        subgiveup += 1
        if subgiveup >= 1000
          warn("Too many loops when handling substitutions!")
          break
        end

        li = subpattern.rindex(" ")
        subpattern = subpattern[0...li]

        result = subs[subpattern]
        if !result.nil?
          msg = msg.sub(subpattern, result)
          break
        end
      end
    end

    fi = pattern.index(" ")
    pattern = pattern[(fi + 1)..]
  end

  result = subs[pattern]
  msg = msg.sub(pattern, result) if !result.nil?

  msg
end

#trigger_regexp(user, regexp) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 309

def trigger_regexp(user, regexp)
  regexp = regexp.gsub(/^\*$/, "<zerowidthstar>")
  regexp = regexp.gsub("*", "(.+?)")
  regexp = regexp.gsub("#", "(\\d+?)")
  regexp = regexp.gsub("_", "(\\w+?)")
  regexp = regexp.gsub(/\s*\{weight=\d+\}\s*/i, "")
  regexp = regexp.gsub("<zerowidthstar>", "(.*?)")
  regexp = regexp.gsub(/\|{2,}/, "|")
  regexp = regexp.gsub(/(\(|\[)\|/, '\1')
  regexp = regexp.gsub(/\|(\)|\])/, '\1')

  if @utf8
    regexp = regexp.gsub("\\@", "\\u0040")
  end

  giveup = 0
  while (match = regexp.match(/\[(.+?)\]/))
    if (giveup += 1) > 50
      warn("Infinite loop when trying to process optionals in a trigger!")
      return ""
    end

    parts = match[1].split("|")
    opts = parts.map { |p| "(?:\\s|\\b)+#{p}(?:\\s|\\b)+" }

    pipes = opts.join("|")
    pipes = pipes.gsub(Regexp.new(Regexp.escape("(.+?)")), "(?:.+?)")
    pipes = pipes.gsub(Regexp.new(Regexp.escape("(\\d+?)")), "(?:\\d+?)")
    pipes = pipes.gsub(Regexp.new(Regexp.escape("(\\w+?)")), "(?:\\w+?)")
    pipes = pipes.gsub("[", "__lb__").gsub("]", "__rb__")
    regexp = regexp.sub(
      Regexp.new("\\s*\\[#{Regexp.escape(match[1])}\\]\\s*"),
      "(?:#{pipes}|(?:\\b|\\s)+)"
    )
  end

  regexp = regexp.gsub("__lb__", "[").gsub("__rb__", "]")
  regexp = regexp.gsub("\\w", "[^\\s\\d]")

  giveup = 0
  while regexp.include?("@")
    if (giveup += 1) > 50
      break
    end
    if (match = regexp.match(/@(.+?)\b/))
      name = match[1]
      rep = ""
      arrays = bot_array
      if arrays[name] && !arrays[name].empty?
        rep = "(?:" + arrays[name].map { |item| Utils.quotemeta(item) }.join("|") + ")"
      end
      regexp = regexp.sub(/@#{Regexp.escape(name)}\b/, rep)
    end
  end

  giveup = 0
  while regexp.include?("<bot")
    if (giveup += 1) > 50
      break
    end
    if (match = regexp.match(/<bot (.+?)>/i))
      name = match[1]
      rep = ""
      vars = bot_var
      rep = Utils.quotemeta(Utils.strip_nasties(vars[name], @utf8).downcase) if vars[name]
      regexp = regexp.sub(/<bot #{Regexp.escape(name)}>/i, rep)
    end
  end

  giveup = 0
  while regexp.include?("<get")
    if (giveup += 1) > 50
      break
    end
    if (match = regexp.match(/<get (.+?)>/i))
      name = match[1]
      rep = @master.get_uservar(user, name)
      regexp = regexp.sub(/<get #{Regexp.escape(name)}>/i, Utils.quotemeta(rep.to_s.downcase))
    end
  end

  giveup = 0
  regexp = regexp.gsub(/<input>/i, "<input1>")
  regexp = regexp.gsub(/<reply>/i, "<reply1>")
  history = bot_session.get(user, "__history__")
  history = new_history if history == "undefined"
  while regexp.include?("<input") || regexp.include?("<reply")
    if (giveup += 1) > 50
      break
    end
    %w[input reply].each do |type|
      (1..9).each do |i|
        tag = "<#{type}#{i}>"
        next unless regexp.include?(tag)

        value = Utils.quotemeta(format_message(history[type][i - 1], type == "reply"))
        regexp = regexp.gsub(tag, value)
      end
    end
  end

  if @utf8 && regexp.include?("\\u")
    regexp = regexp.gsub(/\\u([A-Fa-f0-9]{4})/) { Regexp.last_match(1).to_i(16).chr(Encoding::UTF_8) }
  end

  regexp.gsub(/\|{2,}/m, "|")
end

#warn(message, filename = nil, lineno = nil) ⇒ Object 



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# File 'lib/rivescript/brain.rb', line 224

def warn(message, filename = nil, lineno = nil)
  @master.warn(message, filename, lineno)
end