Module: RethinkDB::RPP

Defined in:
lib/rpp.rb

Constant Summary collapse

@@termtype_to_str = 
Hash[Term::TermType.constants.map{|x| [Term::TermType.const_get(x), x.to_s]
@@regex = 
if __FILE__ =~ /^(.*\/)[^\/]+.rb$/ then /^#{$1}/ else nil end

Class Method Summary collapse

Class Method Details

.bt_consume(bt, el) ⇒ Object 



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# File 'lib/rpp.rb', line 9

def self.bt_consume(bt, el)
  (bt && bt[0] == el) ? bt[1..-1] : nil
end

.can_prefix(name, args) ⇒ Object 



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# File 'lib/rpp.rb', line 96

def self.can_prefix (name, args)
  if (name == "table" ||
      name == "table_drop" ||
      name == "table_create") &&
      (!args.is_a?(Array) ||
           !args[0].is_a?(Array) ||
           args[0][0] != Term::TermType::DB)
    return false
  else
    return !["db", "db_create", "db_drop", "json", "funcall",
             "args", "branch", "http", "binary", "javascript", "random",
             "time", "iso8601", "epoch_time", "now", "geojson", "point",
             "circle", "line", "polygon", "asc", "desc", "literal",
             "range", "error"].include?(name)
  end
end

.pp(term, bt = nil) ⇒ Object 



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# File 'lib/rpp.rb', line 225

def self.pp(term, bt=nil)
  begin
    q = PrettyPrint.new
    pp_int(q, term, bt, true)
    q.flush

    in_bt = false
    q.output.split("\n").map {|line|
      line = line.gsub(/^ */) {|x| x+"\x7"} if in_bt
      arr = line.split("\x7")
      if arr[1]
        in_bt = !(arr[2] || (line[-1] == "\x7"))
        [arr.join(""), " "*arr[0].size + "^"*arr[1].size]
      else
        line
      end
    }.flatten.join("\n")
   rescue Exception => e
    "AN ERROR OCCURED DURING PRETTY-PRINTING:\n#{e.inspect}\n" +
      "FALLING BACK TO GENERIC PRINTER.\n#{term.inspect}"
  end
end

.pp_int(q, term, bt, pre_dot = false) ⇒ Object 



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# File 'lib/rpp.rb', line 112

def self.pp_int(q, term, bt, pre_dot=false)
  q.text("\x7", 0) if bt == []

  term = term.to_pb if term.is_a?(RQL)
  if term.class != Array
    if term.is_a?(Hash)
      if not pp_pseudotype(q, term, bt)
        pp_int_optargs(q, term, bt, pre_dot)
      end
    else
      pp_int_datum(q, term, pre_dot)
    end
    q.text("\x7", 0) if bt == []
    return
  end

  type = term[0]
  args = (term[1] || []).dup
  optargs = (term[2] || {}).dup
  if type == Term::TermType::VAR
    q.text("var_")
    res = pp_int_datum(q, args[0], false)
    q.text("\x7", 0) if bt == []
    return
  elsif type == Term::TermType::FUNC
    q.text("r(") if pre_dot
    q.text("lambda")
    pp_int_func(q, term, bt)
    q.text(")") if pre_dot
    q.text("\x7", 0) if bt == []
    return
  elsif type == Term::TermType::MAKE_ARRAY
    pp_int_args(q, args, bt, pre_dot)
    q.text("\x7", 0) if bt == []
    return
  elsif type == Term::TermType::FUNCALL
    func = (args[0][0] == Term::TermType::FUNC) ? args[0] : nil
    if args.size == 2
      pp_int(q, args[1], bt_consume(bt, 1), pre_dot)
      q.text(".do")
      if !func
        q.text("(")
        pp_int(q, args[0], bt_consume(bt, 0)) if !func
        q.text(")")
      end
    else
      q.text("r.do(")
      (1...args.size).each {|i|
        q.text(", ") if i != 1
        pp_int(q, args[i], bt_consume(bt, i))
      }
      if !func
        q.text(", ")
        pp_int(q, args[0], bt_consume(bt, 0))
      end
      q.text(")")
    end
    pp_int_func(q, args[0], bt_consume(bt, 0)) if func
    return
  end

  name = @@termtype_to_str[type].downcase

  if can_prefix(name, args) && first_arg = args.shift
    pp_int(q, first_arg, bt_consume(bt, 0), true)
    arg_offset = 1
  else
    q.text("r")
    arg_offset = 0
  end
  if name == "bracket"
    argstart, argstop = "[", "]"
  else
    q.text(".")
    q.text(name)
    argstart, argstop = "(", ")"
  end

  if args[-1] && args[-1].is_a?(Array) && args[-1][0] == Term::TermType::FUNC
    func_bt = bt_consume(bt, args.size() - 1 + arg_offset)
    func = args.pop
  end

  if args != [] || optargs != {}
    q.group(0, argstart, argstop) {
      pushed = nil
      q.nest(2) {
        args.each_with_index {|arg, index|
          if !pushed
            pushed = true
            q.breakable('')
          else
            q.text(",")
            q.breakable
          end
          pp_int(q, arg, bt_consume(bt, index + arg_offset))
        }
        if optargs != {}
          if pushed
            q.text(",")
            q.breakable
          end
          pp_int_optargs(q, optargs, bt)
        end
      }
      q.breakable('')
    }
  end

  pp_int_func(q, func, func_bt) if func
  q.text("\x7", 0) if bt == []
end

.pp_int_args(q, args, bt, pre_dot = false) ⇒ Object 



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# File 'lib/rpp.rb', line 56

def self.pp_int_args(q, args, bt, pre_dot = false)
  q.text("r(") if pre_dot
  q.group(1, "[", "]") {
    args.each_with_index {|arg, i|
      if i != 0
        q.text(",")
        q.breakable
      end
      pp_int(q, arg, bt_consume(bt, i))
    }
  }
  q.text(")") if pre_dot
end

.pp_int_datum(q, dat, pre_dot) ⇒ Object 



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# File 'lib/rpp.rb', line 70

def self.pp_int_datum(q, dat, pre_dot)
  q.text("r(") if pre_dot
  q.text(dat.inspect)
  q.text(")") if pre_dot
end

.pp_int_func(q, func, bt) ⇒ Object 



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# File 'lib/rpp.rb', line 76

def self.pp_int_func(q, func, bt)
  begin
    func_args = func[1][0][1].map{|x| x.to_pb}
    func_body = func[1][1]
    q.text(" ")
    q.group(0, "{", "}") {
      if func_args != []
        q.text(func_args.map{|x| :"var_#{x}"}.inspect.gsub(/\[|\]/,"|").gsub(":",""))
      end
      q.nest(2) {
        q.breakable
        pp_int(q, func_body, bt_consume(bt, 1))
      }
      q.breakable('')
    }
  rescue StandardError => e
    q.text(" {#<unprintable function:`#{func}`>}")
  end
end

.pp_int_optargs(q, optargs, bt, pre_dot = false) ⇒ Object 



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# File 'lib/rpp.rb', line 38

def self.pp_int_optargs(q, optargs, bt, pre_dot = false)
  q.text("r(") if pre_dot
  q.group(1, "{", "}") {
    optargs.to_a.each_with_index {|optarg, i|
      if i != 0
        q.text(",")
        q.breakable
      end
      q.text("#{optarg[0].inspect} =>")
      q.nest(2) {
        q.breakable
        pp_int(q, optarg[1], bt_consume(bt, optarg[0]))
      }
    }
  }
  q.text(")") if pre_dot
end

.pp_pseudotype(q, pt, bt) ⇒ Object 



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# File 'lib/rpp.rb', line 13

def self.pp_pseudotype(q, pt, bt)
  if not pt.has_key?('$reql_type$')
    return false
  end

  case pt['$reql_type$']
  when 'TIME' then
    if not (pt.has_key?('epoch_time') and pt.has_key?('timezone'))
      return false
    end
    t = Time.at(pt['epoch_time'])
    tz = pt['timezone']
    t = (tz && tz != "" && tz != "Z") ? t.getlocal(tz) : t.utc
    q.text("r.expr(#{t.inspect})")
  when 'BINARY' then
    if not (pt.has_key?('data'))
      return false
    end
    q.text("<data>")
  else return false
  end

  return true
end