/usr/lib/ruby/1.8/merb-core/core_ext/kernel.rb is in libmerb-core-ruby1.8 1.0.12+dfsg-4fakesync1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Gem
class Dependency
# :api: private
attr_accessor :require_block, :require_as, :original_caller
end
end
module Kernel
# Keep track of all required dependencies.
#
# @param name<String> The name of the gem to load.
# @param *ver<Gem::Requirement, Gem::Version, Array, #to_str>
# Version requirements to be passed to Gem::Dependency.new.
#
# @return <Gem::Dependency> Dependency information
#
# :api: private
def track_dependency(name, clr, *ver, &blk)
options = ver.last.is_a?(Hash) ? ver.pop : {}
new_dep = Gem::Dependency.new(name, ver.empty? ? nil : ver)
new_dep.require_block = blk
new_dep.require_as = options.key?(:require_as) ? options[:require_as] : name
new_dep.original_caller = clr
deps = Merb::BootLoader::Dependencies.dependencies
idx = deps.each_with_index {|d,i| break i if d.name == new_dep.name}
idx = idx.is_a?(Array) ? deps.size + 1 : idx
deps.delete_at(idx)
deps.insert(idx - 1, new_dep)
new_dep
end
# Loads the given string as a gem. Execution is deferred until
# after the logger has been instantiated and the framework directory
# structure is defined.
#
# If that has already happened, the gem will be activated
# immediately, but it will still be registered.
#
# ==== Parameters
# name<String> The name of the gem to load.
# *ver<Gem::Requirement, Gem::Version, Array, #to_str>
# Version requirements to be passed to Gem::Dependency.new.
# If the last argument is a Hash, extract the :immediate option,
# forcing a dependency to load immediately.
#
# ==== Options
#
# :immediate when true, gem is loaded immediately even if framework is not yet ready.
# :require_as file name to require for this gem.
#
# See examples below.
#
# ==== Notes
#
# If block is given, it is called after require is called. If you use a block to
# require multiple files, require first using :require_as option and the rest
# in the block.
#
# ==== Examples
#
# Usage scenario is typically one of the following:
#
# 1. Gem name and loaded file names are the same (ex.: amqp gem uses amqp.rb).
# In this case no extra options needed.
#
# dependency "amqp"
#
# 2. Gem name is different from the file needs to be required
# (ex.: ParseTree gem uses parse_tree.rb as main file).
#
# dependency "ParseTree", :require_as => "parse_tree"
#
# 3. You need to require a number of files from the library explicitly
# (ex.: cherry pick features from xmpp4r). Pass an array to :require_as.
#
# dependency "xmpp4r", :require_as => %w(xmpp4r/client xmpp4r/sasl xmpp4r/vcard)
#
# 4. You need to require a specific version of the gem.
#
# dependency "RedCloth", "3.0.4"
#
# 5. You want to load dependency as soon as the method is called.
#
# dependency "syslog", :immediate => true
#
# 6. You need to execute some arbitraty code after dependency is loaded:
#
# dependency "ruby-growl" do
# g = Growl.new "localhost", "ruby-growl",
# ["ruby-growl Notification"]
# g.notify "ruby-growl Notification", "Ruby-Growl is set up",
# "Ruby-Growl is set up"
# end
#
# When specifying a gem version to use, you can use the same syntax RubyGems
# support, for instance, >= 3.0.2 or >~ 1.2.
#
# See rubygems.org/read/chapter/16 for a complete reference.
#
# ==== Returns
# Gem::Dependency:: The dependency information.
#
# :api: public
def dependency(name, *opts, &blk)
immediate = opts.last.delete(:immediate) if opts.last.is_a?(Hash)
if immediate || Merb::BootLoader.finished?(Merb::BootLoader::Dependencies)
load_dependency(name, caller, *opts, &blk)
else
track_dependency(name, caller, *opts, &blk)
end
end
# Loads the given string as a gem.
#
# This new version tries to load the file via ROOT/gems first before moving
# off to the system gems (so if you have a lower version of a gem in
# ROOT/gems, it'll still get loaded).
#
# @param name<String,Gem::Dependency>
# The name or dependency object of the gem to load.
# @param *ver<Gem::Requirement, Gem::Version, Array, #to_str>
# Version requirements to be passed to Gem.activate.
#
# @note
# If the gem cannot be found, the method will attempt to require the string
# as a library.
#
# @return <Gem::Dependency> The dependency information.
#
# :api: private
def load_dependency(name, clr, *ver, &blk)
begin
dep = name.is_a?(Gem::Dependency) ? name : track_dependency(name, clr, *ver, &blk)
return unless dep.require_as
Gem.activate(dep)
rescue Gem::LoadError => e
begin
Merb.logger.debug "Falling back to a regular require"
if name.kind_of?(Gem::Dependency)
require name.name
else
require name
end
rescue LoadError => le
e.set_backtrace dep.original_caller
Merb.fatal! "The gem #{name}, #{ver.inspect} was not found and we could not require it"
end
end
begin
require dep.require_as
rescue LoadError => e
e.set_backtrace dep.original_caller
Merb.fatal! "The file #{dep.require_as} was not found", e
end
if block = dep.require_block
# reset the require block so it doesn't get called a second time
dep.require_block = nil
block.call
end
Merb.logger.verbose!("loading gem '#{dep.name}' ...")
return dep # ensure needs explicit return
end
# Loads both gem and library dependencies that are passed in as arguments.
# Execution is deferred to the Merb::BootLoader::Dependencies.run during bootup.
#
# ==== Parameters
# *args<String, Hash, Array> The dependencies to load.
#
# ==== Returns
# Array[(Gem::Dependency, Array[Gem::Dependency])]:: Gem::Dependencies for the
# dependencies specified in args.
#
# :api: public
def dependencies(*args)
args.map do |arg|
case arg
when String then dependency(arg)
when Hash then arg.map { |r,v| dependency(r, v) }
when Array then arg.map { |r| dependency(r) }
end
end
end
# Loads both gem and library dependencies that are passed in as arguments.
#
# @param *args<String, Hash, Array> The dependencies to load.
#
# @note
# Each argument can be:
# String:: Single dependency.
# Hash::
# Multiple dependencies where the keys are names and the values versions.
# Array:: Multiple string dependencies.
#
# @example dependencies "RedCloth" # Loads the the RedCloth gem
# @example dependencies "RedCloth", "merb_helpers" # Loads RedCloth and merb_helpers
# @example dependencies "RedCloth" => "3.0" # Loads RedCloth 3.0
#
# :api: private
def load_dependencies(*args)
args.map do |arg|
case arg
when String then load_dependency(arg)
when Hash then arg.map { |r,v| load_dependency(r, v) }
when Array then arg.map { |r| load_dependency(r) }
end
end
end
# Does a basic require, and prints a message if an error occurs.
#
# @param library<to_s> The library to attempt to include.
# @param message<String> The error to add to the log upon failure. Defaults to nil.
#
# :api: private
# @deprecated
def rescue_require(library, message = nil)
Merb.logger.warn("Deprecation warning: rescue_require is deprecated")
sleep 2.0
require library
rescue LoadError, RuntimeError
Merb.logger.error!(message) if message
end
# Used in Merb.root/config/init.rb to tell Merb which ORM (Object Relational
# Mapper) you wish to use. Currently Merb has plugins to support
# ActiveRecord, DataMapper, and Sequel.
#
# ==== Parameters
# orm<Symbol>:: The ORM to use.
#
# ==== Returns
# nil
#
# ==== Example
# use_orm :datamapper
#
# # This will use the DataMapper generator for your ORM
# $ merb-gen model ActivityEvent
#
# ==== Notes
# If for some reason this is called more than once, latter
# call takes over other.
#
# :api: public
def use_orm(orm, &blk)
begin
Merb.orm = orm
orm_plugin = "merb_#{orm}"
Kernel.dependency(orm_plugin, &blk)
rescue LoadError => e
Merb.logger.warn!("The #{orm_plugin} gem was not found. You may need to install it.")
raise e
end
nil
end
# Used in Merb.root/config/init.rb to tell Merb which testing framework to
# use. Currently Merb has plugins to support RSpec and Test::Unit.
#
# ==== Parameters
# test_framework<Symbol>::
# The test framework to use. Currently only supports :rspec and :test_unit.
#
# ==== Returns
# nil
#
# ==== Example
# use_test :rspec
#
# # This will now use the RSpec generator for tests
# $ merb-gen model ActivityEvent
#
# :api: public
def use_testing_framework(test_framework, *test_dependencies)
Merb.test_framework = test_framework
Kernel.dependencies test_dependencies if Merb.env == "test" || Merb.env.nil?
nil
end
def use_test(*args)
use_testing_framework(*args)
end
# Used in Merb.root/config/init.rb to tell Merb which template engine to
# prefer.
#
# ==== Parameters
# template_engine<Symbol>
# The template engine to use.
#
# ==== Returns
# nil
#
# ==== Example
# use_template_engine :haml
#
# # This will now use haml templates in generators where available.
# $ merb-gen resource_controller Project
#
# :api: public
def use_template_engine(template_engine, &blk)
Merb.template_engine = template_engine
if template_engine != :erb
if template_engine.in?(:haml, :builder)
template_engine_plugin = "merb-#{template_engine}"
else
template_engine_plugin = "merb_#{template_engine}"
end
Kernel.dependency(template_engine_plugin, &blk)
end
nil
rescue LoadError => e
Merb.logger.warn!("The #{template_engine_plugin} gem was not found. You may need to install it.")
raise e
end
# @param i<Fixnum> The caller number. Defaults to 1.
#
# @return <Array[Array]> The file, line and method of the caller.
#
# @example
# __caller_info__(1)
# # => ['/usr/lib/ruby/1.8/irb/workspace.rb', '52', 'irb_binding']
#
# :api: private
def __caller_info__(i = 1)
file, line, meth = caller[i].scan(/(.*?):(\d+):in `(.*?)'/).first
end
# @param file<String> The file to read.
# @param line<Fixnum> The line number to look for.
# @param size<Fixnum>
# Number of lines to include above and below the the line to look for.
# Defaults to 4.
#
# @return <Array[Array]>
# Triplets containing the line number, the line and whether this was the
# searched line.
#
# @example
# __caller_lines__('/usr/lib/ruby/1.8/debug.rb', 122, 2) # =>
# [
# [ 120, " def check_suspend", false ],
# [ 121, " return if Thread.critical", false ],
# [ 122, " while (Thread.critical = true; @suspend_next)", true ],
# [ 123, " DEBUGGER__.waiting.push Thread.current", false ],
# [ 124, " @suspend_next = false", false ]
# ]
#
# :api: private
def __caller_lines__(file, line, size = 4)
line = line.to_i
if file =~ /\(erubis\)/
yield :error, "Template Error! Problem while rendering", false
elsif !File.file?(file) || !File.readable?(file)
yield :error, "File `#{file}' not available", false
else
lines = File.read(file).split("\n")
first_line = (f = line - size - 1) < 0 ? 0 : f
if first_line.zero?
new_size = line - 1
lines = lines[first_line, size + new_size + 1]
else
new_size = nil
lines = lines[first_line, size * 2 + 1]
end
lines && lines.each_with_index do |str, index|
line_n = index + line
line_n = (new_size.nil?) ? line_n - size : line_n - new_size
yield line_n, str.chomp
end
end
end
# Takes a block, profiles the results of running the block
# specified number of times and generates HTML report.
#
# @param name<#to_s>
# The file name. The result will be written out to
# Merb.root/"log/#{name}.html".
# @param min<Fixnum>
# Minimum percentage of the total time a method must take for it to be
# included in the result. Defaults to 1.
#
# @return <String>
# The result of the profiling.
#
# @note
# Requires ruby-prof (<tt>sudo gem install ruby-prof</tt>)
#
# @example
# __profile__("MyProfile", 5, 30) do
# rand(10)**rand(10)
# puts "Profile run"
# end
#
# Assuming that the total time taken for #puts calls was less than 5% of the
# total time to run, #puts won't appear in the profile report.
# The code block will be run 30 times in the example above.
#
# :api: private
def __profile__(name, min=1, iter=100)
require 'ruby-prof' unless defined?(RubyProf)
return_result = ''
result = RubyProf.profile do
iter.times{return_result = yield}
end
printer = RubyProf::GraphHtmlPrinter.new(result)
path = File.join(Merb.root, 'log', "#{name}.html")
File.open(path, 'w') do |file|
printer.print(file, {:min_percent => min,
:print_file => true})
end
return_result
end
# Extracts an options hash if it is the last item in the args array. Used
# internally in methods that take *args.
#
# @param args<Array> The arguments to extract the hash from.
#
# @example
# def render(*args,&blk)
# opts = extract_options_from_args!(args) || {}
# # [...]
# end
#
# :api: public
def extract_options_from_args!(args)
args.pop if (args.last.instance_of?(Hash) || args.last.instance_of?(Mash))
end
# Checks that the given objects quack like the given conditions.
#
# @param opts<Hash>
# Conditions to enforce. Each key will receive a quacks_like? call with the
# value (see Object#quacks_like? for details).
#
# @raise <ArgumentError>
# An object failed to quack like a condition.
#
# :api: public
def enforce!(opts = {})
opts.each do |k,v|
raise ArgumentError, "#{k.inspect} doesn't quack like #{v.inspect}" unless k.quacks_like?(v)
end
end
unless Kernel.respond_to?(:debugger)
# Define debugger method so that code even works if debugger was not
# requested. Drops a note to the logs that Debugger was not available.
def debugger
Merb.logger.info! "\n***** Debugger requested, but was not " +
"available: Start server with --debugger " +
"to enable *****\n"
end
end
end
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