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module RSS
##
# RSS::Utils is a module that holds various utility functions that are used
# across many parts of the rest of the RSS library. Like most modules named
# some variant of 'util', its methods are probably not particularly useful
# to those who aren't developing the library itself.
module Utils
module_function
# Given a +name+ in a name_with_underscores or a name-with-dashes format,
# returns the CamelCase version of +name+.
#
# If the +name+ is already CamelCased, nothing happens.
#
# Examples:
#
# require 'rss/utils'
#
# RSS::Utils.to_class_name("sample_name")
# # => "SampleName"
# RSS::Utils.to_class_name("with-dashes")
# # => "WithDashes"
# RSS::Utils.to_class_name("CamelCase")
# # => "CamelCase"
def to_class_name(name)
name.split(/[_\-]/).collect do |part|
"#{part[0, 1].upcase}#{part[1..-1]}"
end.join("")
end
# Returns an array of two elements: the filename where the calling method
# is located, and the line number where it is defined.
#
# Takes an optional argument +i+, which specifies how many callers up the
# stack to look.
#
# Examples:
#
# require 'rss/utils'
#
# def foo
# p RSS::Utils.get_file_and_line_from_caller
# p RSS::Utils.get_file_and_line_from_caller(1)
# end
#
# def bar
# foo
# end
#
# def baz
# bar
# end
#
# baz
# # => ["test.rb", 5]
# # => ["test.rb", 9]
#
# If +i+ is not given, or is the default value of 0, it attempts to figure
# out the correct value. This is useful when in combination with
# instance_eval. For example:
#
# require 'rss/utils'
#
# def foo
# p RSS::Utils.get_file_and_line_from_caller(1)
# end
#
# def bar
# foo
# end
#
# instance_eval <<-RUBY, *RSS::Utils.get_file_and_line_from_caller
# def baz
# bar
# end
# RUBY
#
# baz
#
# # => ["test.rb", 8]
def get_file_and_line_from_caller(i=0)
file, line, = caller[i].split(':')
line = line.to_i
line += 1 if i.zero?
[file, line]
end
# Takes a string +s+ with some HTML in it, and escapes '&', '"', '<' and '>', by
# replacing them with the appropriate entities.
#
# This method is also aliased to h, for convenience.
#
# Examples:
#
# require 'rss/utils'
#
# RSS::Utils.html_escape("Dungeons & Dragons")
# # => "Dungeons & Dragons"
# RSS::Utils.h(">_>")
# # => ">_>"
def html_escape(s)
s.to_s.gsub(/&/, "&").gsub(/\"/, """).gsub(/>/, ">").gsub(/</, "<")
end
alias h html_escape
# If +value+ is an instance of class +klass+, return it, else
# create a new instance of +klass+ with value +value+.
def new_with_value_if_need(klass, value)
if value.is_a?(klass)
value
else
klass.new(value)
end
end
# This method is used inside of several different objects to determine
# if special behavior is needed in the constructor.
#
# Special behavior is needed if the array passed in as +args+ has
# +true+ or +false+ as its value, and if the second element of +args+
# is a hash.
def element_initialize_arguments?(args)
[true, false].include?(args[0]) and args[1].is_a?(Hash)
end
module YesCleanOther
module_function
def parse(value)
if [true, false, nil].include?(value)
value
else
case value.to_s
when /\Ayes\z/i
true
when /\Aclean\z/i
false
else
nil
end
end
end
end
module YesOther
module_function
def parse(value)
if [true, false].include?(value)
value
else
/\Ayes\z/i.match(value.to_s) ? true : false
end
end
end
module CSV
module_function
def parse(value, &block)
if value.is_a?(String)
value = value.strip.split(/\s*,\s*/)
value = value.collect(&block) if block_given?
value
else
value
end
end
end
module InheritedReader
def inherited_reader(constant_name)
base_class = inherited_base
result = base_class.const_get(constant_name)
found_base_class = false
ancestors.reverse_each do |klass|
if found_base_class
if klass.const_defined?(constant_name)
result = yield(result, klass.const_get(constant_name))
end
else
found_base_class = klass == base_class
end
end
result
end
def inherited_array_reader(constant_name)
inherited_reader(constant_name) do |result, current|
current + result
end
end
def inherited_hash_reader(constant_name)
inherited_reader(constant_name) do |result, current|
result.merge(current)
end
end
end
end
end
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