Class: Cosmos::ConfigParser

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

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://cosmosrb.com/docs/home") ⇒ ConfigParser

Returns a new instance of ConfigParser.

Parameters:

  • url (String) (defaults to: "http://cosmosrb.com/docs/home") —

    The url to link to in error messages



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# File 'lib/cosmos/config/config_parser.rb', line 133

def initialize(url = "http://cosmosrb.com/docs/home")
  @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 29

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 22

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 33

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 38

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 25

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 42

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 294

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 239

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 254

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 271

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 49

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 59

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 81

def self.splash
  @@splash
end

.splash=(splash) ⇒ Object

Parameters:



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

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 143

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, &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.

  • 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 183

def parse_file(filename,
               yield_non_keyword_lines = false,
               remove_quotes = true,
               &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)
  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

#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 148

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]
    if RUBY_VERSION.split('.')[0..1].join.to_i >= 21
      options[:locals].each {|key, value| b.local_variable_set(key, value) }
    else
      options[:locals].each do |key, value|
        if value.is_a? String
          b.eval("#{key} = '#{value}'")
        else
          b.eval("#{key} = #{value}")
        end
      end
    end
  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
  ERB.new(File.read(path)).result(b)
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 219

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