Module: PgArrayParser

Included in:
ActiveRecord::ConnectionAdapters::PostgreSQLAdapter, ActiveRecord::ConnectionAdapters::PostgreSQLColumn, ActiveRecord::ConnectionAdapters::PostgreSQLColumn
Defined in:
lib/ar_jdbc_pg_array/parser.rb

Constant Summary collapse

CURLY_BRACKETS = 
'{}'.freeze
SQUARE_BRACKETS = 
'[]'.freeze
NULL = 
'NULL'.freeze
NIL = 
'nil'.freeze
ESCAPE_HASH = 
{'\\'.freeze=>'\\\\'.freeze, '"'.freeze=>'\\"'.freeze}

Instance Method Summary collapse

Instance Method Details

#_parse_pgarray(text, &block) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 62

def _parse_pgarray(text, &block)
  values = []
  return values  if text =~ /^\}\s*/
  if text =~ /^\{\s*/
    text = $'
    while true
      ar, rest = _parse_pgarray(text, &block)
      values << ar
      if rest =~ /^\}\s*/
        return values, $'
      elsif rest =~ /^,\s*\{\s*/
        rest = $'
      else
        raise "Mailformed postgres array"
      end
      text = rest
    end
  else
    while true
      if text =~ /^"((?:\\.|[^"\\])*)"([,}])\s*/
        val, sep, rest = $1, $2, $'
        val.gsub!(/\\(.)/, '\1')
        val = yield val
      elsif text =~ /^([^,\}]*)([,}])\s*/
        val, sep, rest = $1, $2, $'
        val = val == NULL ? nil : yield(val)
      else
        raise "Mailformed postgres array"
      end
      values << val
      if sep == '}'
        return values, rest
      end
      text = rest
    end
  end
end

#_parse_safe_pgarray(text, &block) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 26

def _parse_safe_pgarray(text, &block)
  values = []
  return values  if text =~ /^\}\s*/
  if text =~ /^\{\s*/
    text = $'
    while true
      ar, rest = _parse_safe_pgarray(text, &block)
      values << ar
      if rest =~ /^\}\s*/
        return values, $'
      elsif rest =~ /^,\s*/
        rest = $'
      else
        raise "Mailformed postgres array"
      end
      text = rest
    end
  else
    while true
      raise 'Mailformed Array' unless text =~ /^([^,\}]*)([,\}])\s*/
      val, sep, rest = $1, $2, $'
      values << (val == NULL ? nil : yield(val))
      if sep == '}'
        return values, rest
      end
      text = rest
    end
  end
end

#_prepare_pg_string_array(value, &block) ⇒ Object Also known as: prepare_pg_string_array 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 155

def _prepare_pg_string_array(value, &block)
  value = value.map{|val|
    case val
    when Array
      _prepare_pg_string_array(val, &block)
    when nil
      NULL
    else
      val = yield val
      if val =~ /^'(.*)'$/m
        "\"#{ $1.gsub(/\\|"/){|s| ESCAPE_HASH[s]} }\""
      else
        val
      end
    end
  }.join(',')
  "{#{value}}"
end

#_remap_array(array, &block) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 100

def _remap_array(array, &block)
  array.map{|v|
    case v
    when Array
      _remap_array(v, &block)
    when nil
      nil
    else
      yield v
    end
  }
end

#parse_numeric_pgarray(text) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 10

def parse_numeric_pgarray(text)
  text = text.tr(CURLY_BRACKETS, SQUARE_BRACKETS)
  text.downcase!
  JSON.load(text)
end

#parse_pgarray(text, &block) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 56

def parse_pgarray(text, &block)
  raise "Mailformed postgres array" unless text =~ /^\{\s*/
  ar, rest = _parse_pgarray($', &block)
  ar
end

#parse_safe_pgarray(text, &block) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 16

def parse_safe_pgarray(text, &block)
  if text =~ /^\{([^\}]*)\}$/
    $1.split(/,\s*/).map!{|v| v == NULL ? nil : yield(v)}
  else
    raise "Mailformed array" unless text =~ /^\{\s*/
    ar, rest = _parse_safe_pgarray($')
    ar
  end
end

#prepare_pg_float_array(value) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 120

def prepare_pg_float_array(value)
  val = _remap_array(value){|v| v.to_f}.inspect
  val.gsub!(NIL, NULL)
  val.tr!(SQUARE_BRACKETS, CURLY_BRACKETS)
  val
end

#prepare_pg_integer_array(value) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 113

def prepare_pg_integer_array(value)
  val = _remap_array(value){|v| v.to_i}.inspect
  val.gsub!(NIL, NULL)
  val.tr!(SQUARE_BRACKETS, CURLY_BRACKETS)
  val
end

#prepare_pg_safe_array(value) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 127

def prepare_pg_safe_array(value)
  value = value.map{|val|
      case val
      when Array
        prepare_pg_safe_array(val)
      when nil
        NULL
      else
        val.to_s
      end
  }.join(',')
  "{#{value}}"
end

#prepare_pg_text_array(value) ⇒ Object 



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# File 'lib/ar_jdbc_pg_array/parser.rb', line 141

def prepare_pg_text_array(value)
  value = value.map{|val|
    case val
    when Array
      prepare_pg_text_array(val)
    when nil
      NULL
    else
       "\"#{val.to_s.gsub(/\\|"/){|s| ESCAPE_HASH[s]}}\""
    end
  }.join(',')
  "{#{value}}"
end