Class: Cute::ConfigParser

Inherits:
Object
  • Object
show all
Defined in:
lib/cute/configparser.rb

Overview

Sample file:

database:

user: myser
password: thepassword
ip: 127.0.0.1

cache:

size: 1234
# default directory: /tmp
# default strict: true

# default values for environments fields

Parser

cp = ConfigParser.new(yamlstr) conf = :db=>{, :cache=>{}, :env=>{}, :pxe => {}} cp.parse(‘database’,true) do

# String with default value
conf[:db][:user] = cp.value('user',String,nil,'defaultvalue')
# Mandatory String
conf[:db][:password] = cp.value('password',String)
# String with multiple possible values
conf[:db][:kind] = cp.value('kind',String,nil,['MySQL','PostGRE','Oracle'])
# Regexp
conf[:db][:ip] = cp.value('ip',String,'127.0.0.1',
  /\A\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}\Z/
)

end cp.parse(‘cache’,true) do

# Integer with default value
conf[:cache][:size] = cp.value('size',Fixnum,nil,100)
# Directory that need to exist and be r/w
conf[:cache][:directory] = cp.value('directory',String,'/tmp',
  {
    :type => 'dir',
    :readable => true,
    :writable => true,
    :create => true,
    :mode => 0700
  }
)
# Boolean
conf[:cache][:strict] = cp.value('strict',[TrueClass,FalseClass],true)

end

# Non-mandatory field cp.parse(‘environments’) do

# Specification of a unix path
conf[:env][:tar_dir] = cp.value('tarball_dir',String,'/tmp',Pathname)
# Add a prefix to a value
conf[:env][:user_dir] = cp.value('user_dir',String,'/tmp',
  {:type => 'dir', :prefix => '/home/'}
)

end

Constant Summary collapse

PATH_SEPARATOR = 
'/'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(confighash) ⇒ ConfigParser

Returns a new instance of ConfigParser.



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# File 'lib/cute/configparser.rb', line 69

def initialize(confighash)
  @basehash = confighash
  # The current path
  @path = []
  # The current value
  @val = confighash
end

Instance Attribute Details

#basehash ⇒ Object (readonly)

Returns the value of attribute basehash.



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# File 'lib/cute/configparser.rb', line 66

def basehash
  @basehash
end

Class Method Details

.errmsg(field, message) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 113

def self.errmsg(field,message)
  "#{message} [field: #{field}]"
end

.pathstr(array) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 117

def self.pathstr(array)
  array.compact.join(PATH_SEPARATOR)
end

Instance Method Details

#check_array(val, array, fieldname) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 167

def check_array(val, array, fieldname)
  unless array.include?(val)
    raise ParserError.new(
      "Invalid value '#{val}', allowed value"\
      "#{(array.size == 1 ? " is" : "s are")}: "\
      "#{(array.size == 1 ? '' : "'#{array[0..-2].join("', '")}' or ")}"\
      "'#{array[-1]}'"
    )
  end
end

#check_dir(val, dir, fieldname) ⇒ Object

A directory, checking if exists (creating it otherwise) and writable



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# File 'lib/cute/configparser.rb', line 207

def check_dir(val, dir, fieldname)
  if File.exist?(val)
    unless File.directory?(val)
      raise ParserError.new("'#{val}' is not a regular directory")
    end
  else
    raise ParserError.new("The directory '#{val}' does not exists")
  end
end

#check_field(fieldname, mandatory, type) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 121

def check_field(fieldname,mandatory,type)
  begin
    if @val.is_a?(Hash)
      if !@val[fieldname].nil?
        if type.is_a?(Class)
          typeok = @val[fieldname].is_a?(type)
        elsif type.is_a?(Array)
          type.each do |t|
            typeok = @val[fieldname].is_a?(t)
            break if typeok
          end
        else
          raise 'Internal Error'
        end

        if typeok
          yield(@val[fieldname])
        else
          $,=','
          typename = type.to_s
          $,=nil
          raise ParserError.new(
            "The field should have the type #{typename}"
          )
        end
      elsif mandatory
        raise ParserError.new("The field is mandatory")
      else
        yield(nil)
      end
    elsif mandatory
      if @val.nil?
        raise ParserError.new("The field is mandatory")
      else
        raise ParserError.new("The field has to be a Hash")
      end
    else
      yield(nil)
    end
  rescue ParserError => pe
    raise ArgumentError.new(
      ConfigParser.errmsg(path(fieldname),pe.message)
    )
  end
end

#check_file(val, file, fieldname) ⇒ Object

A file, checking if exists (creating it otherwise) and writable



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# File 'lib/cute/configparser.rb', line 196

def check_file(val, file, fieldname)
  if File.exists?(val)
    unless File.file?(val)
      raise ParserError.new("The file '#{val}' is not a regular file")
    end
  else
    raise ParserError.new("The file '#{val}' does not exists")
  end
end

#check_hash(val, hash, fieldname) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 178

def check_hash(val, hash, fieldname)
  self.send("customcheck_#{hash[:type].downcase}".to_sym,val,fieldname,hash)
end

#check_pathname(val, pathname, fieldname) ⇒ Object

A pathname, checking if exists (creating it otherwise) and writable



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# File 'lib/cute/configparser.rb', line 218

def check_pathname(val, pathname, fieldname)
  begin
    Pathname.new(val)
  rescue
    raise ParserError.new("Invalid pathname '#{val}'")
  end
end

#check_range(val, range, fieldname) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 182

def check_range(val, range, fieldname)
  check_array(val, range.entries, fieldname)
end

#check_regexp(val, regexp, fieldname) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 186

def check_regexp(val, regexp, fieldname)
  unless val =~ regexp
    raise ParserError.new(
      "Invalid value '#{val}', the value must have the form (ruby-regexp): "\
      "#{regexp.source}"
    )
  end
end

#check_string(val, str, fieldname) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 226

def check_string(val, str, fieldname)
  unless val == str
    raise ParserError.new(
      "Invalid value '#{val}', allowed values are: '#{str}'"
    )
  end
end

#curval ⇒ Object 



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# File 'lib/cute/configparser.rb', line 95

def curval
  ret = @basehash
  @path.compact.each do |field|
    begin
      field = Integer(field)
    rescue ArgumentError
    end

    if ret[field]
      ret = ret[field]
    else
      ret = nil
      break
    end
  end
  ret
end

#customcheck_code(val, fieldname, args) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 234

def customcheck_code(val, fieldname, args)
  begin
    eval("#{args[:prefix]}#{args[:code]}#{args[:suffix]}")
  rescue
    raise ParserError.new("Invalid expression '#{args[:code]}'")
  end
end

#customcheck_dir(val, fieldname, args) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 277

def customcheck_dir(val, fieldname, args)
  return if args[:disable]
  val = File.join(args[:prefix],val) if args[:prefix]
  val = File.join(val,args[:suffix]) if args[:suffix]
  if File.exist?(val)
    if File.directory?(val)
      if args[:writable]
        unless File.stat(val).writable?
          raise ParserError.new("The directory '#{val}' is not writable")
        end
      end

      if args[:readable]
        unless File.stat(val).readable?
          raise ParserError.new("The directory '#{val}' is not readable")
        end
      end
    else
      raise ParserError.new("'#{val}' is not a regular directory")
    end
  else
    if args[:create]
      begin
        puts "The directory '#{val}' does not exists, let's create it"
        tmp = FileUtils.mkdir_p(val, :mode => (args[:mode] || 0700))
        raise if tmp.is_a?(FalseClass)
      rescue
        raise ParserError.new("Cannot create the directory '#{val}'")
      end
    else
      raise ParserError.new("The directory '#{val}' does not exists")
    end
  end
end

#customcheck_file(val, fieldname, args) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 242

def customcheck_file(val, fieldname, args)
  return if args[:disable]
  val = File.join(args[:prefix],val) if args[:prefix]
  val = File.join(val,args[:suffix]) if args[:suffix]
  if File.exists?(val)
    if File.file?(val)
      if args[:writable]
        unless File.stat(val).writable?
          raise ParserError.new("The file '#{val}' is not writable")
        end
      end

      if args[:readable]
        unless File.stat(val).readable?
          raise ParserError.new("The file '#{val}' is not readable")
        end
      end
    else
      raise ParserError.new("The file '#{val}' is not a regular file")
    end
  else
    if args[:create]
      begin
        puts "The file '#{val}' does not exists, let's create it"
        tmp = FileUtils.touch(val)
        raise if tmp.is_a?(FalseClass)
      rescue
        raise ParserError.new("Cannot create the file '#{val}'")
      end
    else
      raise ParserError.new("The file '#{val}' does not exists")
    end
  end
end

#depth ⇒ Object 



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# File 'lib/cute/configparser.rb', line 87

def depth
  @path.size
end

#parse(fieldname, mandatory = false, type = Hash) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 313

def parse(fieldname, mandatory=false, type=Hash)
  check_field(fieldname,mandatory,type) do |curval|
    oldval = @val
    push(fieldname, curval)

    if curval.is_a?(Array)
      curval.each_index do |i|
        push(i)
        yield({
          :val => curval,
          :empty => curval.nil?,
          :path => path,
          :iter => i,
        })
        pop()
      end
      curval.clear
    else
      yield({
        :val => curval,
        :empty => curval.nil?,
        :path => path,
        :iter => 0,
      })
    end

    oldval.delete(fieldname) if curval and curval.empty?

    pop(oldval)
  end
end

#path(val = nil) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 91

def path(val=nil)
  ConfigParser.pathstr(@path + [val])
end

#pop(val = nil) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 82

def pop(val=nil)
  @path.pop
  @val = (val.nil? ? curval() : val)
end

#push(fieldname, val = nil) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 77

def push(fieldname, val=nil)
  @path.push(fieldname)
  @val = (val.nil? ? curval() : val)
end

#unused(result = [], curval = nil, curpath = nil) ⇒ Object 



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# File 'lib/cute/configparser.rb', line 372

def unused(result = [],curval=nil,curpath=nil)
  curval = @basehash if curval.nil?
  curpath = [] unless curpath

  if curval.is_a?(Hash)
    curval.each do |key,value|
      curpath << key
      if value.nil?
        result << ConfigParser.pathstr(curpath)
      else
        unused(result,value,curpath)
      end
      curpath.pop
    end
  elsif curval.is_a?(Array)
    curval.each_index do |i|
      curpath << i
      if curval[i].nil?
        result << ConfigParser.pathstr(curpath)
      else
        unused(result,curval[i],curpath)
      end
      curpath.pop
    end
  else
    result << ConfigParser.pathstr(curpath)
  end

  result
end

#value(fieldname, type, defaultvalue = nil, expected = nil) ⇒ Object

if no defaultvalue defined, field is mandatory



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# File 'lib/cute/configparser.rb', line 346

def value(fieldname,type,defaultvalue=nil,expected=nil)
  ret = nil
  check_field(fieldname,defaultvalue.nil?,type) do |val|
    if val.nil?
      ret = defaultvalue
    else
      ret = val
      @val.delete(fieldname)
    end
    #ret = (val.nil? ? defaultvalue : val)

    if expected
      classname = (
        expected.class == Class ? expected.name : expected.class.name
      ).split('::').last
      self.send(
        "check_#{classname.downcase}".to_sym,
        ret,
        expected,
        fieldname
      )
    end
  end
  ret
end