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Edit File : task.rb \| Size : 9.47 KB
require 'rake/invocation_exception_mixin' module Rake # ######################################################################### # A Task is the basic unit of work in a Rakefile. Tasks have associated # actions (possibly more than one) and a list of prerequisites. When # invoked, a task will first ensure that all of its prerequisites have an # opportunity to run and then it will execute its own actions. # # Tasks are not usually created directly using the new method, but rather # use the +file+ and +task+ convenience methods. # class Task # List of prerequisites for a task. attr_reader :prerequisites # List of actions attached to a task. attr_reader :actions # Application owning this task. attr_accessor :application # Comment for this task. Restricted to a single line of no more than 50 # characters. attr_reader :comment # Full text of the (possibly multi-line) comment. attr_reader :full_comment # Array of nested namespaces names used for task lookup by this task. attr_reader :scope # File/Line locations of each of the task definitions for this # task (only valid if the task was defined with the detect # location option set). attr_reader :locations # Return task name def to_s name end def inspect "<#{self.class} #{name} => [#{prerequisites.join(', ')}]>" end # List of sources for task. attr_writer :sources def sources @sources \|\|= [] end # List of prerequisite tasks def prerequisite_tasks prerequisites.collect { \|pre\| lookup_prerequisite(pre) } end def lookup_prerequisite(prerequisite_name) application[prerequisite_name, @scope] end private :lookup_prerequisite # First source from a rule (nil if no sources) def source @sources.first if defined?(@sources) end # Create a task named +task_name+ with no actions or prerequisites. Use # +enhance+ to add actions and prerequisites. def initialize(task_name, app) @name = task_name.to_s @prerequisites = [] @actions = [] @already_invoked = false @full_comment = nil @comment = nil @lock = Monitor.new @application = app @scope = app.current_scope @arg_names = nil @locations = [] end # Enhance a task with prerequisites or actions. Returns self. def enhance(deps=nil, &block) @prerequisites \|= deps if deps @actions << block if block_given? self end # Name of the task, including any namespace qualifiers. def name @name.to_s end # Name of task with argument list description. def name_with_args # :nodoc: if arg_description "#{name}#{arg_description}" else name end end # Argument description (nil if none). def arg_description # :nodoc: @arg_names ? "[#{(arg_names \|\| []).join(',')}]" : nil end # Name of arguments for this task. def arg_names @arg_names \|\| [] end # Reenable the task, allowing its tasks to be executed if the task # is invoked again. def reenable @already_invoked = false end # Clear the existing prerequisites and actions of a rake task. def clear clear_prerequisites clear_actions self end # Clear the existing prerequisites of a rake task. def clear_prerequisites prerequisites.clear self end # Clear the existing actions on a rake task. def clear_actions actions.clear self end # Invoke the task if it is needed. Prerequisites are invoked first. def invoke(args) task_args = TaskArguments.new(arg_names, args) invoke_with_call_chain(task_args, InvocationChain::EMPTY) end # Same as invoke, but explicitly pass a call chain to detect # circular dependencies. def invoke_with_call_chain(task_args, invocation_chain) # :nodoc: new_chain = InvocationChain.append(self, invocation_chain) @lock.synchronize do if application.options.trace $stderr.puts "* Invoke #{name} #{format_trace_flags}" end return if @already_invoked @already_invoked = true invoke_prerequisites(task_args, new_chain) execute(task_args) if needed? end rescue Exception => ex add_chain_to(ex, new_chain) raise ex end protected :invoke_with_call_chain def add_chain_to(exception, new_chain) exception.extend(InvocationExceptionMixin) unless exception.respond_to?(:chain) exception.chain = new_chain if exception.chain.nil? end private :add_chain_to # Invoke all the prerequisites of a task. def invoke_prerequisites(task_args, invocation_chain) # :nodoc: prerequisite_tasks.each { \|prereq\| prereq_args = task_args.new_scope(prereq.arg_names) prereq.invoke_with_call_chain(prereq_args, invocation_chain) } end # Format the trace flags for display. def format_trace_flags flags = [] flags << "first_time" unless @already_invoked flags << "not_needed" unless needed? flags.empty? ? "" : "(" + flags.join(", ") + ")" end private :format_trace_flags # Execute the actions associated with this task. def execute(args=nil) args \|\|= EMPTY_TASK_ARGS if application.options.dryrun $stderr.puts " Execute (dry run) #{name}" return end if application.options.trace $stderr.puts " Execute #{name}" end application.enhance_with_matching_rule(name) if @actions.empty? @actions.each do \|act\| case act.arity when 1 act.call(self) else act.call(self, args) end end end # Is this task needed? def needed? true end # Timestamp for this task. Basic tasks return the current time for their # time stamp. Other tasks can be more sophisticated. def timestamp prerequisite_tasks.collect { \|pre\| pre.timestamp }.max \|\| Time.now end # Add a description to the task. The description can consist of an option # argument list (enclosed brackets) and an optional comment. def add_description(description) return if ! description comment = description.strip add_comment(comment) if comment && ! comment.empty? end # Writing to the comment attribute is the same as adding a description. def comment=(description) add_description(description) end # Add a comment to the task. If a comment already exists, separate # the new comment with " / ". def add_comment(comment) if @full_comment @full_comment << " / " else @full_comment = '' end @full_comment << comment if @full_comment =~ /\A([^.]+?\.)( \|$)/ @comment = $1 else @comment = @full_comment end end private :add_comment # Set the names of the arguments for this task. +args+ should be # an array of symbols, one for each argument name. def set_arg_names(args) @arg_names = args.map { \|a\| a.to_sym } end # Return a string describing the internal state of a task. Useful for # debugging. def investigation result = "------------------------------\n" result << "Investigating #{name}\n" result << "class: #{self.class}\n" result << "task needed: #{needed?}\n" result << "timestamp: #{timestamp}\n" result << "pre-requisites: \n" prereqs = prerequisite_tasks prereqs.sort! {\|a,b\| a.timestamp <=> b.timestamp} prereqs.each do \|p\| result << "--#{p.name} (#{p.timestamp})\n" end latest_prereq = prerequisite_tasks.collect { \|pre\| pre.timestamp }.max result << "latest-prerequisite time: #{latest_prereq}\n" result << "................................\n\n" return result end # ---------------------------------------------------------------- # Rake Module Methods # class << self # Clear the task list. This cause rake to immediately forget all the # tasks that have been assigned. (Normally used in the unit tests.) def clear Rake.application.clear end # List of all defined tasks. def tasks Rake.application.tasks end # Return a task with the given name. If the task is not currently # known, try to synthesize one from the defined rules. If no rules are # found, but an existing file matches the task name, assume it is a file # task with no dependencies or actions. def [](task_name) Rake.application[task_name] end # TRUE if the task name is already defined. def task_defined?(task_name) Rake.application.lookup(task_name) != nil end # Define a task given +args+ and an option block. If a rule with the # given name already exists, the prerequisites and actions are added to # the existing task. Returns the defined task. def define_task(args, &block) Rake.application.define_task(self, args, &block) end # Define a rule for synthesizing tasks. def create_rule(args, &block) Rake.application.create_rule(args, &block) end # Apply the scope to the task name according to the rules for # this kind of task. Generic tasks will accept the scope as # part of the name. def scope_name(scope, task_name) (scope + [task_name]).join(':') end end # class << Rake::Task end # class Rake::Task end Back

Edit File : task.rb | Size : 9.47 KB

require 'rake/invocation_exception_mixin'

module Rake

# #########################################################################
  # A Task is the basic unit of work in a Rakefile.  Tasks have associated
  # actions (possibly more than one) and a list of prerequisites.  When
  # invoked, a task will first ensure that all of its prerequisites have an
  # opportunity to run and then it will execute its own actions.
  #
  # Tasks are not usually created directly using the new method, but rather
  # use the +file+ and +task+ convenience methods.
  #
  class Task
    # List of prerequisites for a task.
    attr_reader :prerequisites

# List of actions attached to a task.
    attr_reader :actions

# Application owning this task.
    attr_accessor :application

# Comment for this task.  Restricted to a single line of no more than 50
    # characters.
    attr_reader :comment

# Full text of the (possibly multi-line) comment.
    attr_reader :full_comment

# Array of nested namespaces names used for task lookup by this task.
    attr_reader :scope

# File/Line locations of each of the task definitions for this
    # task (only valid if the task was defined with the detect
    # location option set).
    attr_reader :locations

# Return task name
    def to_s
      name
    end

def inspect
      "<#{self.class} #{name} => [#{prerequisites.join(', ')}]>"
    end

# List of sources for task.
    attr_writer :sources
    def sources
      @sources ||= []
    end

# List of prerequisite tasks
    def prerequisite_tasks
      prerequisites.collect { |pre| lookup_prerequisite(pre) }
    end

def lookup_prerequisite(prerequisite_name)
      application[prerequisite_name, @scope]
    end
    private :lookup_prerequisite

# First source from a rule (nil if no sources)
    def source
      @sources.first if defined?(@sources)
    end

# Create a task named +task_name+ with no actions or prerequisites. Use
    # +enhance+ to add actions and prerequisites.
    def initialize(task_name, app)
      @name = task_name.to_s
      @prerequisites = []
      @actions = []
      @already_invoked = false
      @full_comment = nil
      @comment = nil
      @lock = Monitor.new
      @application = app
      @scope = app.current_scope
      @arg_names = nil
      @locations = []
    end

# Enhance a task with prerequisites or actions.  Returns self.
    def enhance(deps=nil, &block)
      @prerequisites |= deps if deps
      @actions << block if block_given?
      self
    end

# Name of the task, including any namespace qualifiers.
    def name
      @name.to_s
    end

# Name of task with argument list description.
    def name_with_args # :nodoc:
      if arg_description
        "#{name}#{arg_description}"
      else
        name
      end
    end

# Argument description (nil if none).
    def arg_description # :nodoc:
      @arg_names ? "[#{(arg_names || []).join(',')}]" : nil
    end

# Name of arguments for this task.
    def arg_names
      @arg_names || []
    end

# Reenable the task, allowing its tasks to be executed if the task
    # is invoked again.
    def reenable
      @already_invoked = false
    end

# Clear the existing prerequisites and actions of a rake task.
    def clear
      clear_prerequisites
      clear_actions
      self
    end

# Clear the existing prerequisites of a rake task.
    def clear_prerequisites
      prerequisites.clear
      self
    end

# Clear the existing actions on a rake task.
    def clear_actions
      actions.clear
      self
    end

# Invoke the task if it is needed.  Prerequisites are invoked first.
    def invoke(*args)
      task_args = TaskArguments.new(arg_names, args)
      invoke_with_call_chain(task_args, InvocationChain::EMPTY)
    end

# Same as invoke, but explicitly pass a call chain to detect
    # circular dependencies.
    def invoke_with_call_chain(task_args, invocation_chain) # :nodoc:
      new_chain = InvocationChain.append(self, invocation_chain)
      @lock.synchronize do
        if application.options.trace
          $stderr.puts "** Invoke #{name} #{format_trace_flags}"
        end
        return if @already_invoked
        @already_invoked = true
        invoke_prerequisites(task_args, new_chain)
        execute(task_args) if needed?
      end
    rescue Exception => ex
      add_chain_to(ex, new_chain)
      raise ex
    end
    protected :invoke_with_call_chain

def add_chain_to(exception, new_chain)
      exception.extend(InvocationExceptionMixin) unless exception.respond_to?(:chain)
      exception.chain = new_chain if exception.chain.nil?
    end
    private :add_chain_to

# Invoke all the prerequisites of a task.
    def invoke_prerequisites(task_args, invocation_chain) # :nodoc:
      prerequisite_tasks.each { |prereq|
        prereq_args = task_args.new_scope(prereq.arg_names)
        prereq.invoke_with_call_chain(prereq_args, invocation_chain)
      }
    end

# Format the trace flags for display.
    def format_trace_flags
      flags = []
      flags << "first_time" unless @already_invoked
      flags << "not_needed" unless needed?
      flags.empty? ? "" : "(" + flags.join(", ") + ")"
    end
    private :format_trace_flags

# Execute the actions associated with this task.
    def execute(args=nil)
      args ||= EMPTY_TASK_ARGS
      if application.options.dryrun
        $stderr.puts "** Execute (dry run) #{name}"
        return
      end
      if application.options.trace
        $stderr.puts "** Execute #{name}"
      end
      application.enhance_with_matching_rule(name) if @actions.empty?
      @actions.each do |act|
        case act.arity
        when 1
          act.call(self)
        else
          act.call(self, args)
        end
      end
    end

# Is this task needed?
    def needed?
      true
    end

# Timestamp for this task.  Basic tasks return the current time for their
    # time stamp.  Other tasks can be more sophisticated.
    def timestamp
      prerequisite_tasks.collect { |pre| pre.timestamp }.max || Time.now
    end

# Add a description to the task.  The description can consist of an option
    # argument list (enclosed brackets) and an optional comment.
    def add_description(description)
      return if ! description
      comment = description.strip
      add_comment(comment) if comment && ! comment.empty?
    end

# Writing to the comment attribute is the same as adding a description.
    def comment=(description)
      add_description(description)
    end

# Add a comment to the task.  If a comment already exists, separate
    # the new comment with " / ".
    def add_comment(comment)
      if @full_comment
        @full_comment << " / "
      else
        @full_comment = ''
      end
      @full_comment << comment
      if @full_comment =~ /\A([^.]+?\.)( |$)/
        @comment = $1
      else
        @comment = @full_comment
      end
    end
    private :add_comment

# Set the names of the arguments for this task. +args+ should be
    # an array of symbols, one for each argument name.
    def set_arg_names(args)
      @arg_names = args.map { |a| a.to_sym }
    end

# Return a string describing the internal state of a task.  Useful for
    # debugging.
    def investigation
      result = "------------------------------\n"
      result << "Investigating #{name}\n"
      result << "class: #{self.class}\n"
      result <<  "task needed: #{needed?}\n"
      result <<  "timestamp: #{timestamp}\n"
      result << "pre-requisites: \n"
      prereqs = prerequisite_tasks
      prereqs.sort! {|a,b| a.timestamp <=> b.timestamp}
      prereqs.each do |p|
        result << "--#{p.name} (#{p.timestamp})\n"
      end
      latest_prereq = prerequisite_tasks.collect { |pre| pre.timestamp }.max
      result <<  "latest-prerequisite time: #{latest_prereq}\n"
      result << "................................\n\n"
      return result
    end

# ----------------------------------------------------------------
    # Rake Module Methods
    #
    class << self

# Clear the task list.  This cause rake to immediately forget all the
      # tasks that have been assigned.  (Normally used in the unit tests.)
      def clear
        Rake.application.clear
      end

# List of all defined tasks.
      def tasks
        Rake.application.tasks
      end

# Return a task with the given name.  If the task is not currently
      # known, try to synthesize one from the defined rules.  If no rules are
      # found, but an existing file matches the task name, assume it is a file
      # task with no dependencies or actions.
      def [](task_name)
        Rake.application[task_name]
      end

# TRUE if the task name is already defined.
      def task_defined?(task_name)
        Rake.application.lookup(task_name) != nil
      end

# Define a task given +args+ and an option block.  If a rule with the
      # given name already exists, the prerequisites and actions are added to
      # the existing task.  Returns the defined task.
      def define_task(*args, &block)
        Rake.application.define_task(self, *args, &block)
      end

# Define a rule for synthesizing tasks.
      def create_rule(*args, &block)
        Rake.application.create_rule(*args, &block)
      end

# Apply the scope to the task name according to the rules for
      # this kind of task.  Generic tasks will accept the scope as
      # part of the name.
      def scope_name(scope, task_name)
        (scope + [task_name]).join(':')
      end

end # class << Rake::Task
  end # class Rake::Task
end

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