Class: Cosmos::ConfigParser

Inherits:
Object show all
Defined in:
lib/cosmos/config/config_parser.rb,
ext/cosmos/ext/config_parser/config_parser.c

Overview

Reads COSMOS style configuration data which consists of keywords followed by 0 or more comma delimited parameters. Parameters with spaces must be enclosed in quotes. Quotes should also be used to indicate a parameter is a string. Keywords are case-insensitive and will be returned in uppercase.

Defined Under Namespace

Classes: Error

Constant Summary collapse

PARSING_REGEX =

Regular expression used to break up an individual line into a keyword and comma delimited parameters. Handles parameters in single or double quotes.

%r{ (?:"(?:[^\\"]|\\.)*") | (?:'(?:[^\\']|\\.)*') | \S+ }x
@@message_callback =

See Also:

nil
@@progress_callback =

See Also:

nil
@@splash =

Holds the current splash screen

nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(url = "http://cosmosc2.com/docs/v5") ⇒ ConfigParser

Returns a new instance of ConfigParser.

Parameters:

  • url (String) (defaults to: "http://cosmosc2.com/docs/v5") —

    The url to link to in error messages



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# File 'lib/cosmos/config/config_parser.rb', line 142

def initialize(url = "http://cosmosc2.com/docs/v5")
  @url = url
end

Instance Attribute Details

#filename ⇒ String

Returns The name of the configuration file being parsed. This will be an empty string if the parse_string class method is used.

Returns:

  • (String) —

    The name of the configuration file being parsed. This will be an empty string if the parse_string class method is used.



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# File 'lib/cosmos/config/config_parser.rb', line 38

def filename
  @filename
end

#keyword ⇒ String

Returns The current keyword being parsed.

Returns:

  • (String) —

    The current keyword being parsed



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# File 'lib/cosmos/config/config_parser.rb', line 31

def keyword
  @keyword
end

#line ⇒ String

Returns The current line being parsed. This is the raw string which is useful when printing errors.

Returns:

  • (String) —

    The current line being parsed. This is the raw string which is useful when printing errors.



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# File 'lib/cosmos/config/config_parser.rb', line 42

def line
  @line
end

#line_number ⇒ Integer

Returns The current line number being parsed. This will still be populated when using parse_string because lines still must be delimited by newline characters.

Returns:

  • (Integer) —

    The current line number being parsed. This will still be populated when using parse_string because lines still must be delimited by newline characters.



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# File 'lib/cosmos/config/config_parser.rb', line 47

def line_number
  @line_number
end

#parameters ⇒ Array<String>

Returns The parameters found after the keyword.

Returns:

  • (Array<String>) —

    The parameters found after the keyword



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# File 'lib/cosmos/config/config_parser.rb', line 34

def parameters
  @parameters
end

#url ⇒ String

Returns The default URL to use in errors. The URL can still be overridden by directly passing it to the error method.

Returns:

  • (String) —

    The default URL to use in errors. The URL can still be overridden by directly passing it to the error method.



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# File 'lib/cosmos/config/config_parser.rb', line 51

def url
  @url
end

Class Method Details

.handle_defined_constants(value, data_type = nil, bit_size = nil) ⇒ Numeric

Converts a string representing a defined constant into its value. The defined constants are the minimum and maximum values for all the allowable data types. [MIN/MAX]_[U]INT and [MIN/MAX]_FLOAT. Thus MIN_UINT8, MAX_INT32, and MIN_FLOAT64 are all allowable values. Any other strings raise ArgumentError but all other types are simply returned.

Parameters:

  • value (Object) —

    Can be anything

Returns:

  • (Numeric) —

    The converted value. Either a Fixnum or Float.



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# File 'lib/cosmos/config/config_parser.rb', line 322

def self.handle_defined_constants(value, data_type = nil, bit_size = nil)
  if value.class == String
    case value.upcase
    when 'MIN', 'MAX'
      return self.calculate_range_value(value.upcase, data_type, bit_size)
    when 'MIN_INT8'
      return -128
    when 'MAX_INT8'
      return 127
    when 'MIN_INT16'
      return -32768
    when 'MAX_INT16'
      return 32767
    when 'MIN_INT32'
      return -2147483648
    when 'MAX_INT32'
      return 2147483647
    when 'MIN_INT64'
      return -9223372036854775808
    when 'MAX_INT64'
      return 9223372036854775807
    when 'MIN_UINT8', 'MIN_UINT16', 'MIN_UINT32', 'MIN_UINT64'
      return 0
    when 'MAX_UINT8'
      return 255
    when 'MAX_UINT16'
      return 65535
    when 'MAX_UINT32'
      return 4294967295
    when 'MAX_UINT64'
      return 18446744073709551615
    when 'MIN_FLOAT64'
      return -Float::MAX
    when 'MAX_FLOAT64'
      return Float::MAX
    when 'MIN_FLOAT32'
      return -3.402823e38
    when 'MAX_FLOAT32'
      return 3.402823e38
    when 'POS_INFINITY'
      return Float::INFINITY
    when 'NEG_INFINITY'
      return -Float::INFINITY
    else
      raise ArgumentError, "Could not convert constant: #{value}"
    end
  end
  return value
end

.handle_nil(value) ⇒ nil|Object

Converts a String containing ”, ‘NIL’ or ‘NULL’ to nil Ruby primitive. All other arguments are simply returned.

Parameters:

Returns:



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# File 'lib/cosmos/config/config_parser.rb', line 267

def self.handle_nil(value)
  if String === value
    case value.upcase
    when '', 'NIL', 'NULL'
      return nil
    end
  end
  return value
end

.handle_true_false(value) ⇒ true|false|Object

Converts a String containing ‘TRUE’ or ‘FALSE’ to true or false Ruby primitive. All other values are simply returned.

Parameters:

Returns:



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# File 'lib/cosmos/config/config_parser.rb', line 282

def self.handle_true_false(value)
  if String === value
    case value.upcase
    when 'TRUE'
      return true
    when 'FALSE'
      return false
    end
  end
  return value
end

.handle_true_false_nil(value) ⇒ true|false|nil|Object

Converts a String containing ”, ‘NIL’, ‘NULL’, ‘TRUE’ or ‘FALSE’ to nil, true or false Ruby primitives. All other values are simply returned.

Parameters:

Returns:



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# File 'lib/cosmos/config/config_parser.rb', line 299

def self.handle_true_false_nil(value)
  if String === value
    case value.upcase
    when 'TRUE'
      return true
    when 'FALSE'
      return false
    when '', 'NIL', 'NULL'
      return nil
    end
  end
  return value
end

.message_callback=(message_callback) ⇒ Object

Parameters:

  • message_callback (#call(String)) —

    Callback method called with a String when various parsing events occur.



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# File 'lib/cosmos/config/config_parser.rb', line 58

def self.message_callback=(message_callback)
  @@message_callback = message_callback
end

.progress_callback=(progress_callback) ⇒ Object

Parameters:

  • progress_callback (#call(Float)) —

    Callback method called with a Float (0.0 to 100.0) based on the amount of the io param that has currently been processed.



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# File 'lib/cosmos/config/config_parser.rb', line 68

def self.progress_callback=(progress_callback)
  @@progress_callback = progress_callback
end

.splash ⇒ Object

Returns the current splash screen if present



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# File 'lib/cosmos/config/config_parser.rb', line 90

def self.splash
  @@splash
end

.splash=(splash) ⇒ Object

Parameters:

  • splash (Splash::SplashDialogBox) —

    Set the splash dialog box which will be updated with messages and progress.



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# File 'lib/cosmos/config/config_parser.rb', line 77

def self.splash=(splash)
  if splash
    @@splash = splash
    @@progress_callback = splash.progress_callback
    @@message_callback = splash.message_callback
  else
    @@splash = nil
    @@progress_callback = nil
    @@message_callback = nil
  end
end

Instance Method Details

#error(message, usage = "", url = @url) ⇒ Error

Creates an Error

Parameters:

  • message (String) —

    The string to set the Exception message to

  • usage (String) (defaults to: "") —

    The usage message

  • url (String) (defaults to: @url) —

    Where to get help about this error

Returns:

  • (Error) —

    The constructed error



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# File 'lib/cosmos/config/config_parser.rb', line 152

def error(message, usage = "", url = @url)
  return Error.new(self, message, usage, url)
end

#parse_file(filename, yield_non_keyword_lines = false, remove_quotes = true, run_erb = true, variables = {}, &block) {|keyword, parameters| ... } ⇒ Object

Processes a file and yields |config| to the given block

Parameters:

  • filename (String) —

    The full name and path of the configuration file

  • yield_non_keyword_lines (Boolean) (defaults to: false) —

    Whether to yield all lines including blank lines or comment lines.

  • remove_quotes (Boolean) (defaults to: true) —

    Whether to remove beginning and ending single or double quote characters from parameters.

  • run_erb (Boolean) (defaults to: true) —

    Whether or not to run ERB on the file

  • variables (Hash) (defaults to: {}) —

    variables to pash to ERB context

  • block (Block) —

    The block to yield to

Yield Parameters:

  • keyword (String) —

    The keyword in the current parsed line

  • parameters (Array<String>) —

    The parameters in the current parsed line

Raises:



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# File 'lib/cosmos/config/config_parser.rb', line 187

def parse_file(filename,
               yield_non_keyword_lines = false,
               remove_quotes = true,
               run_erb = true,
               variables = {},
               &block)
  raise Error.new(self, "Configuration file #{filename} does not exist.") unless filename && File.exist?(filename)

  @filename = filename

  # Create a temp file where we write the ERB parsed output
  file = create_parsed_output_file(filename, run_erb, variables)
  size = file.stat.size.to_f

  # Callbacks for beginning of parsing
  @@message_callback.call("Parsing #{size} bytes of #{filename}") if @@message_callback
  @@progress_callback.call(0.0) if @@progress_callback

  begin
    # Loop through each line of the data
    parse_loop(file,
               yield_non_keyword_lines,
               remove_quotes,
               size,
               PARSING_REGEX,
               &block)
  rescue Exception => e # Catch EVERYTHING so we can re-raise with additional info
    raise e, "#{e}\n\nParsed output in #{file.path}", e.backtrace
  ensure
    file.close unless file.closed?
  end
end

#parse_loop(io, yield_non_keyword_lines, remove_quotes, size, rx) ⇒ Object

Iterates over each line of the io object and yields the keyword and parameters



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# File 'lib/cosmos/config/config_parser.rb', line 442

def parse_loop(io, yield_non_keyword_lines, remove_quotes, size, rx)
  line_continuation = false

  @line_number = 0
  @keyword = nil
  @parameters = []
  @line = nil

  while true
    @line_number += 1

    if @@progress_callback && ((@line_number % 10) == 0)
      @@progress_callback.call(io.pos / size) if size > 0.0
    end

    begin
      line = io.readline
    rescue Exception
      break
    end

    line.strip!
    data = line.scan(rx)
    first_item = data[0].to_s

    if line_continuation
      @line << line
      # Carry over keyword and parameters
    else
      @line = line
      if (first_item.length == 0) || (first_item[0] == '#')
        @keyword = nil
      else
        @keyword = first_item.upcase
      end
      @parameters = []
    end

    # Ignore comments and blank lines
    if @keyword.nil?
      if (yield_non_keyword_lines) && (!line_continuation)
        yield(@keyword, @parameters)
      end
      next
    end

    if line_continuation
      if remove_quotes
        @parameters << first_item.remove_quotes
      else
        @parameters << first_item
      end
      line_continuation = false
    end

    length = data.length
    if length > 1
      (1..(length - 1)).each do |index|
        string = data[index]

        # Don't process trailing comments such as:
        # KEYWORD PARAM #This is a comment
        # But still process Ruby string interpolations such as:
        # KEYWORD PARAM #{var}
        if (string.length > 0) && (string[0] == '#')
          if !((string.length > 1) && (string[1] == '{'))
            break
          end
        end

        # If the string is simply '&' and its the last string then its a line continuation so break the loop
        if (string.length == 1) && (string[0] == '&') && (index == (length - 1))
          line_continuation = true
          next
        end

        line_continuation = false
        if remove_quotes
          @parameters << string.remove_quotes
        else
          @parameters << string
        end
      end
    end

    # If we detected a line continuation while going through all the
    # strings on the line then we strip off the continuation character and
    # return to the top of the loop to continue processing the line.
    if line_continuation
      # Strip the continuation character
      if @line.length >= 1
        @line = @line[0..-2]
      else
        @line = ""
      end
      next
    end

    yield(@keyword, @parameters)
  end

  @@progress_callback.call(1.0) if @@progress_callback

  return nil
end

#render(template_name, options = {}) ⇒ Object

Called by the ERB template to render a partial

Raises:



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# File 'lib/cosmos/config/config_parser.rb', line 157

def render(template_name, options = {})
  raise Error.new(self, "Partial name '#{template_name}' must begin with an underscore.") if File.basename(template_name)[0] != '_'

  b = binding
  if options[:locals]
    options[:locals].each { |key, value| b.local_variable_set(key, value) }
  end
  # Assume the file is there. If not we raise a pretty obvious error
  if File.expand_path(template_name) == template_name # absolute path
    path = template_name
  else # relative to the current @filename
    path = File.join(File.dirname(@filename), template_name)
  end
  Cosmos.set_working_dir(File.dirname(path)) do
    return ERB.new(File.read(path)).result(b)
  end
end

#verify_num_parameters(min_num_params, max_num_params, usage = "") ⇒ Object

Verifies the parameters in the config parameter have the specified number of parameter and raises an Error if not.

Parameters:

  • min_num_params (Integer) —

    The minimum number of parameters

  • max_num_params (Integer) —

    The maximum number of parameters. Pass nil to indicate there is no maximum number of parameters.



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# File 'lib/cosmos/config/config_parser.rb', line 226

def verify_num_parameters(min_num_params, max_num_params, usage = "")
  # This syntax works with 0 because each doesn't return any values
  # for a backwards range
  (1..min_num_params).each do |index|
    # If the parameter is nil (0 based) then we have a problem
    if @parameters[index - 1].nil?
      raise Error.new(self, "Not enough parameters for #{@keyword}.", usage, @url)
    end
  end
  # If they pass nil for max_params we don't check for a maximum number
  if max_num_params && !@parameters[max_num_params].nil?
    raise Error.new(self, "Too many parameters for #{@keyword}.", usage, @url)
  end
end

#verify_parameter_naming(index, usage = "") ⇒ Object

Verifies the indicated parameter in the config doesn’t start or end with an underscore, doesn’t contain a double underscore, doesn’t contain spaces and doesn’t start with a close bracket.

Parameters:

  • index (Integer) —

    The index of the parameter to check



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# File 'lib/cosmos/config/config_parser.rb', line 246

def verify_parameter_naming(index, usage = "")
  param = @parameters[index - 1]
  if param.end_with? '_'
    raise Error.new(self, "Parameter #{index} (#{param}) for #{@keyword} cannot end with an underscore ('_').", usage, @url)
  end
  if param.include? '__'
    raise Error.new(self, "Parameter #{index} (#{param}) for #{@keyword} cannot contain a double underscore ('__').", usage, @url)
  end
  if param.include? ' '
    raise Error.new(self, "Parameter #{index} (#{param}) for #{@keyword} cannot contain a space (' ').", usage, @url)
  end
  if param.start_with?('}')
    raise Error.new(self, "Parameter #{index} (#{param}) for #{@keyword} cannot start with a close bracket ('}').", usage, @url)
  end
end