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Edit File : task_manager.rb \| Size : 8.40 KB
module Rake # The TaskManager module is a mixin for managing tasks. module TaskManager # Track the last comment made in the Rakefile. attr_accessor :last_description alias :last_comment :last_description # Backwards compatibility def initialize super @tasks = Hash.new @rules = Array.new @scope = Scope.make @last_description = nil end def create_rule(args, &block) pattern, args, deps = resolve_args(args) pattern = Regexp.new(Regexp.quote(pattern) + '$') if String === pattern @rules << [pattern, args, deps, block] end def define_task(task_class, args, &block) task_name, arg_names, deps = resolve_args(args) task_name = task_class.scope_name(@scope, task_name) deps = [deps] unless deps.respond_to?(:to_ary) deps = deps.map { \|d\| d.to_s } task = intern(task_class, task_name) task.set_arg_names(arg_names) unless arg_names.empty? if Rake::TaskManager.record_task_metadata add_location(task) task.add_description(get_description(task)) end task.enhance(deps, &block) end # Lookup a task. Return an existing task if found, otherwise # create a task of the current type. def intern(task_class, task_name) @tasks[task_name.to_s] \|\|= task_class.new(task_name, self) end # Find a matching task for +task_name+. def [](task_name, scopes=nil) task_name = task_name.to_s self.lookup(task_name, scopes) or enhance_with_matching_rule(task_name) or synthesize_file_task(task_name) or fail "Don't know how to build task '#{task_name}'" end def synthesize_file_task(task_name) return nil unless File.exist?(task_name) define_task(Rake::FileTask, task_name) end # Resolve the arguments for a task/rule. Returns a triplet of # [task_name, arg_name_list, prerequisites]. def resolve_args(args) if args.last.is_a?(Hash) deps = args.pop resolve_args_with_dependencies(args, deps) else resolve_args_without_dependencies(args) end end # Resolve task arguments for a task or rule when there are no # dependencies declared. # # The patterns recognized by this argument resolving function are: # # task :t # task :t, [:a] # def resolve_args_without_dependencies(args) task_name = args.shift if args.size == 1 && args.first.respond_to?(:to_ary) arg_names = args.first.to_ary else arg_names = args end [task_name, arg_names, []] end private :resolve_args_without_dependencies # Resolve task arguments for a task or rule when there are # dependencies declared. # # The patterns recognized by this argument resolving function are: # # task :t => [:d] # task :t, [a] => [:d] # def resolve_args_with_dependencies(args, hash) # :nodoc: fail "Task Argument Error" if hash.size != 1 key, value = hash.map { \|k, v\| [k, v] }.first if args.empty? task_name = key arg_names = [] deps = value else task_name = args.shift arg_names = key deps = value end deps = [deps] unless deps.respond_to?(:to_ary) [task_name, arg_names, deps] end private :resolve_args_with_dependencies # If a rule can be found that matches the task name, enhance the # task with the prerequisites and actions from the rule. Set the # source attribute of the task appropriately for the rule. Return # the enhanced task or nil of no rule was found. def enhance_with_matching_rule(task_name, level=0) fail Rake::RuleRecursionOverflowError, "Rule Recursion Too Deep" if level >= 16 @rules.each do \|pattern, args, extensions, block\| if pattern.match(task_name) task = attempt_rule(task_name, args, extensions, block, level) return task if task end end nil rescue Rake::RuleRecursionOverflowError => ex ex.add_target(task_name) fail ex end # List of all defined tasks in this application. def tasks @tasks.values.sort_by { \|t\| t.name } end # List of all the tasks defined in the given scope (and its # sub-scopes). def tasks_in_scope(scope) prefix = scope.path tasks.select { \|t\| /^#{prefix}:/ =~ t.name } end # Clear all tasks in this application. def clear @tasks.clear @rules.clear end # Lookup a task, using scope and the scope hints in the task name. # This method performs straight lookups without trying to # synthesize file tasks or rules. Special scope names (e.g. '^') # are recognized. If no scope argument is supplied, use the # current scope. Return nil if the task cannot be found. def lookup(task_name, initial_scope=nil) initial_scope \|\|= @scope task_name = task_name.to_s if task_name =~ /^rake:/ scopes = Scope.make task_name = task_name.sub(/^rake:/, '') elsif task_name =~ /^(\^+)/ scopes = initial_scope.trim($1.size) task_name = task_name.sub(/^(\^+)/, '') else scopes = initial_scope end lookup_in_scope(task_name, scopes) end # Lookup the task name def lookup_in_scope(name, scope) loop do tn = scope.path_with_task_name(name) task = @tasks[tn] return task if task break if scope.empty? scope = scope.tail end nil end private :lookup_in_scope # Return the list of scope names currently active in the task # manager. def current_scope @scope end # Evaluate the block in a nested namespace named +name+. Create # an anonymous namespace if +name+ is nil. def in_namespace(name) name \|\|= generate_name @scope = Scope.new(name, @scope) ns = NameSpace.new(self, @scope) yield(ns) ns ensure @scope = @scope.tail end private # Add a location to the locations field of the given task. def add_location(task) loc = find_location task.locations << loc if loc task end # Find the location that called into the dsl layer. def find_location locations = caller i = 0 while locations[i] return locations[i + 1] if locations[i] =~ /rake\/dsl_definition.rb/ i += 1 end nil end # Generate an anonymous namespace name. def generate_name @seed \|\|= 0 @seed += 1 "_anon_#{@seed}" end def trace_rule(level, message) options.trace_output.puts "#{" " * level}#{message}" if Rake.application.options.trace_rules end # Attempt to create a rule given the list of prerequisites. def attempt_rule(task_name, args, extensions, block, level) sources = make_sources(task_name, extensions) prereqs = sources.map { \|source\| trace_rule level, "Attempting Rule #{task_name} => #{source}" if File.exist?(source) \|\| Rake::Task.task_defined?(source) trace_rule level, "(#{task_name} => #{source} ... EXIST)" source elsif parent = enhance_with_matching_rule(source, level + 1) trace_rule level, "(#{task_name} => #{source} ... ENHANCE)" parent.name else trace_rule level, "(#{task_name} => #{source} ... FAIL)" return nil end } task = FileTask.define_task(task_name, {args => prereqs}, &block) task.sources = prereqs task end # Make a list of sources from the list of file name extensions / # translation procs. def make_sources(task_name, extensions) result = extensions.map { \|ext\| case ext when /%/ task_name.pathmap(ext) when %r{/} ext when /^\./ task_name.ext(ext) when String ext when Proc if ext.arity == 1 ext.call(task_name) else ext.call end else fail "Don't know how to handle rule dependent: #{ext.inspect}" end } result.flatten end private # Return the current description, clearing it in the process. def get_description(task) desc = @last_description @last_description = nil desc end class << self attr_accessor :record_task_metadata TaskManager.record_task_metadata = false end end end Back

Edit File : task_manager.rb | Size : 8.40 KB

module Rake

# The TaskManager module is a mixin for managing tasks.
  module TaskManager
    # Track the last comment made in the Rakefile.
    attr_accessor :last_description
    alias :last_comment :last_description    # Backwards compatibility

def initialize
      super
      @tasks = Hash.new
      @rules = Array.new
      @scope = Scope.make
      @last_description = nil
    end

def create_rule(*args, &block)
      pattern, args, deps = resolve_args(args)
      pattern = Regexp.new(Regexp.quote(pattern) + '$') if String === pattern
      @rules << [pattern, args, deps, block]
    end

def define_task(task_class, *args, &block)
      task_name, arg_names, deps = resolve_args(args)
      task_name = task_class.scope_name(@scope, task_name)
      deps = [deps] unless deps.respond_to?(:to_ary)
      deps = deps.map { |d| d.to_s }
      task = intern(task_class, task_name)
      task.set_arg_names(arg_names) unless arg_names.empty?
      if Rake::TaskManager.record_task_metadata
        add_location(task)
        task.add_description(get_description(task))
      end
      task.enhance(deps, &block)
    end

# Lookup a task.  Return an existing task if found, otherwise
    # create a task of the current type.
    def intern(task_class, task_name)
      @tasks[task_name.to_s] ||= task_class.new(task_name, self)
    end

# Find a matching task for +task_name+.
    def [](task_name, scopes=nil)
      task_name = task_name.to_s
      self.lookup(task_name, scopes) or
        enhance_with_matching_rule(task_name) or
        synthesize_file_task(task_name) or
        fail "Don't know how to build task '#{task_name}'"
    end

def synthesize_file_task(task_name)
      return nil unless File.exist?(task_name)
      define_task(Rake::FileTask, task_name)
    end

# Resolve the arguments for a task/rule.  Returns a triplet of
    # [task_name, arg_name_list, prerequisites].
    def resolve_args(args)
      if args.last.is_a?(Hash)
        deps = args.pop
        resolve_args_with_dependencies(args, deps)
      else
        resolve_args_without_dependencies(args)
      end
    end

# Resolve task arguments for a task or rule when there are no
    # dependencies declared.
    #
    # The patterns recognized by this argument resolving function are:
    #
    #   task :t
    #   task :t, [:a]
    #
    def resolve_args_without_dependencies(args)
      task_name = args.shift
      if args.size == 1 && args.first.respond_to?(:to_ary)
        arg_names = args.first.to_ary
      else
        arg_names = args
      end
      [task_name, arg_names, []]
    end
    private :resolve_args_without_dependencies

# Resolve task arguments for a task or rule when there are
    # dependencies declared.
    #
    # The patterns recognized by this argument resolving function are:
    #
    #   task :t => [:d]
    #   task :t, [a] => [:d]
    #
    def resolve_args_with_dependencies(args, hash) # :nodoc:
      fail "Task Argument Error" if hash.size != 1
      key, value = hash.map { |k, v| [k, v] }.first
      if args.empty?
        task_name = key
        arg_names = []
        deps = value
      else
        task_name = args.shift
        arg_names = key
        deps = value
      end
      deps = [deps] unless deps.respond_to?(:to_ary)
      [task_name, arg_names, deps]
    end
    private :resolve_args_with_dependencies

# If a rule can be found that matches the task name, enhance the
    # task with the prerequisites and actions from the rule.  Set the
    # source attribute of the task appropriately for the rule.  Return
    # the enhanced task or nil of no rule was found.
    def enhance_with_matching_rule(task_name, level=0)
      fail Rake::RuleRecursionOverflowError,
        "Rule Recursion Too Deep" if level >= 16
      @rules.each do |pattern, args, extensions, block|
        if pattern.match(task_name)
          task = attempt_rule(task_name, args, extensions, block, level)
          return task if task
        end
      end
      nil
    rescue Rake::RuleRecursionOverflowError => ex
      ex.add_target(task_name)
      fail ex
    end

# List of all defined tasks in this application.
    def tasks
      @tasks.values.sort_by { |t| t.name }
    end

# List of all the tasks defined in the given scope (and its
    # sub-scopes).
    def tasks_in_scope(scope)
      prefix = scope.path
      tasks.select { |t|
        /^#{prefix}:/ =~ t.name
      }
    end

# Clear all tasks in this application.
    def clear
      @tasks.clear
      @rules.clear
    end

# Lookup a task, using scope and the scope hints in the task name.
    # This method performs straight lookups without trying to
    # synthesize file tasks or rules.  Special scope names (e.g. '^')
    # are recognized.  If no scope argument is supplied, use the
    # current scope.  Return nil if the task cannot be found.
    def lookup(task_name, initial_scope=nil)
      initial_scope ||= @scope
      task_name = task_name.to_s
      if task_name =~ /^rake:/
        scopes = Scope.make
        task_name = task_name.sub(/^rake:/, '')
      elsif task_name =~ /^(\^+)/
        scopes = initial_scope.trim($1.size)
        task_name = task_name.sub(/^(\^+)/, '')
      else
        scopes = initial_scope
      end
      lookup_in_scope(task_name, scopes)
    end

# Lookup the task name
    def lookup_in_scope(name, scope)
      loop do
        tn = scope.path_with_task_name(name)
        task = @tasks[tn]
        return task if task
        break if scope.empty?
        scope = scope.tail
      end
      nil
    end
    private :lookup_in_scope

# Return the list of scope names currently active in the task
    # manager.
    def current_scope
      @scope
    end

# Evaluate the block in a nested namespace named +name+.  Create
    # an anonymous namespace if +name+ is nil.
    def in_namespace(name)
      name ||= generate_name
      @scope = Scope.new(name, @scope)
      ns = NameSpace.new(self, @scope)
      yield(ns)
      ns
    ensure
      @scope = @scope.tail
    end

private

# Add a location to the locations field of the given task.
    def add_location(task)
      loc = find_location
      task.locations << loc if loc
      task
    end

# Find the location that called into the dsl layer.
    def find_location
      locations = caller
      i = 0
      while locations[i]
        return locations[i + 1] if locations[i] =~ /rake\/dsl_definition.rb/
        i += 1
      end
      nil
    end

# Generate an anonymous namespace name.
    def generate_name
      @seed ||= 0
      @seed += 1
      "_anon_#{@seed}"
    end

def trace_rule(level, message)
      options.trace_output.puts "#{"    " * level}#{message}" if
        Rake.application.options.trace_rules
    end

# Attempt to create a rule given the list of prerequisites.
    def attempt_rule(task_name, args, extensions, block, level)
      sources = make_sources(task_name, extensions)
      prereqs = sources.map { |source|
        trace_rule level, "Attempting Rule #{task_name} => #{source}"
        if File.exist?(source) || Rake::Task.task_defined?(source)
          trace_rule level, "(#{task_name} => #{source} ... EXIST)"
          source
        elsif parent = enhance_with_matching_rule(source, level + 1)
          trace_rule level, "(#{task_name} => #{source} ... ENHANCE)"
          parent.name
        else
          trace_rule level, "(#{task_name} => #{source} ... FAIL)"
          return nil
        end
      }
      task = FileTask.define_task(task_name, {args => prereqs}, &block)
      task.sources = prereqs
      task
    end

# Make a list of sources from the list of file name extensions /
    # translation procs.
    def make_sources(task_name, extensions)
      result = extensions.map { |ext|
        case ext
        when /%/
          task_name.pathmap(ext)
        when %r{/}
          ext
        when /^\./
          task_name.ext(ext)
        when String
          ext
        when Proc
          if ext.arity == 1
            ext.call(task_name)
          else
            ext.call
          end
        else
          fail "Don't know how to handle rule dependent: #{ext.inspect}"
        end
      }
      result.flatten
    end

private

# Return the current description, clearing it in the process.
    def get_description(task)
      desc = @last_description
      @last_description = nil
      desc
    end

class << self
      attr_accessor :record_task_metadata
      TaskManager.record_task_metadata = false
    end
  end

end

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