Class: Nanoc::Compiler

Inherits:
Object
  • Object
show all
Extended by:
Memoization
Defined in:
lib/nanoc/base/compilation/compiler.rb

Overview

Responsible for compiling a site’s item representations.

The compilation process makes use of notifications (see NotificationCenter) to track dependencies between items, layouts, etc. The following notifications are used:

  • compilation_started — indicates that the compiler has started compiling this item representation. Has one argument: the item representation itself. Only one item can be compiled at a given moment; therefore, it is not possible to get two consecutive compilation_started notifications without also getting a compilation_ended notification in between them.

  • compilation_ended — indicates that the compiler has finished compiling this item representation (either successfully or with failure). Has one argument: the item representation itself.

  • visit_started — indicates that the compiler requires content or attributes from the item representation that will be visited. Has one argument: the visited item identifier. This notification is used to track dependencies of items on other items; a visit_started event followed by another visit_started event indicates that the item corresponding to the former event will depend on the item from the latter event.

  • visit_ended — indicates that the compiler has finished visiting the item representation and that the requested attributes or content have been fetched (either successfully or with failure)

  • processing_started — indicates that the compiler has started processing the specified object, which can be an item representation (when it is compiled) or a layout (when it is used to lay out an item representation or when it is used as a partial)

  • processing_ended — indicates that the compiler has finished processing the specified object.

Accessors (collapse)

Public instance methods (collapse)

Private instance methods (collapse)

Methods included from Memoization

memoize

Constructor Details

- (Compiler) initialize(site)

Creates a new compiler fo the given site

Parameters:

  • site (Nanoc::Site)

    The site this compiler belongs to



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# File 'lib/nanoc/base/compilation/compiler.rb', line 60

def initialize(site)
  @site = site

  @stack = []
end

Instance Attribute Details

- (Nanoc::Site) site (readonly)

Returns The site this compiler belongs to

Returns:



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# File 'lib/nanoc/base/compilation/compiler.rb', line 46

def site
  @site
end

- (Array) stack (readonly)

The compilation stack. When the compiler begins compiling a rep or a layout, it will be placed on the stack; when it is done compiling the rep or layout, it will be removed from the stack.

Returns:

  • (Array)

    The compilation stack



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# File 'lib/nanoc/base/compilation/compiler.rb', line 53

def stack
  @stack
end

Instance Method Details

- (Hash) assigns_for(rep)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns The assigns that should be used in the next filter/layout operation

Parameters:

  • rep (Nanoc::ItemRep)

    The item representation for which the assigns should be fetched

Returns:

  • (Hash)

    The assigns that should be used in the next filter/layout operation



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# File 'lib/nanoc/base/compilation/compiler.rb', line 269

def assigns_for(rep)
  if rep.binary?
    content_or_filename_assigns = { filename: rep.temporary_filenames[:last] }
  else
    content_or_filename_assigns = { content: rep.content[:last] }
  end

  content_or_filename_assigns.merge({
    item: rep.item,
    rep: rep,
    item_rep: rep,
    items: site.items,
    layouts: site.layouts,
    config: site.config,
    site: site
  })
end

- (Object) build_reps

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Creates the representations of all items as defined by the compilation rules.



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# File 'lib/nanoc/base/compilation/compiler.rb', line 214

def build_reps
  items.each do |item|
    # Find matching rules
    matching_rules = rules_collection.item_compilation_rules_for(item)
    raise Nanoc::Errors::NoMatchingCompilationRuleFound.new(item) if matching_rules.empty?

    # Create reps
    rep_names = matching_rules.map(&:rep_name).uniq
    rep_names.each do |rep_name|
      item.reps << ItemRep.new(item, rep_name)
    end
  end
end

- (Nanoc::DependencyTracker) dependency_tracker

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns the dependency tracker for this site, creating it first if it does not yet exist.

Returns:



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# File 'lib/nanoc/base/compilation/compiler.rb', line 185

def dependency_tracker
  dt = Nanoc::DependencyTracker.new(@site.items + @site.layouts)
  dt.compiler = self
  dt
end

- (void) load

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Load the helper data that is used for compiling the site.



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# File 'lib/nanoc/base/compilation/compiler.rb', line 111

def load
  return if @loaded || @loading
  @loading = true

  # Load site if necessary
  site.load

  # Preprocess
  rules_collection.load
  preprocess
  site.setup_child_parent_links
  build_reps
  route_reps

  # Load auxiliary stores
  stores.each(&:load)

  @loaded = true
rescue => e
  unload
  raise e
ensure
  @loading = false
end

- (Object) objects

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns all objects managed by the site (items, layouts, code snippets, site configuration and the rules).



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# File 'lib/nanoc/base/compilation/compiler.rb', line 205

def objects
  site.items + site.layouts + site.code_snippets +
    [site.config, rules_collection]
end

- (Nanoc::OutdatednessChecker) outdatedness_checker

Returns The outdatedness checker

Returns:



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# File 'lib/nanoc/base/compilation/compiler.rb', line 288

def outdatedness_checker
  Nanoc::OutdatednessChecker.new(
    site: @site,
    checksum_store: checksum_store,
    dependency_tracker: dependency_tracker)
end

- (Object) preprocess

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Runs the preprocessors.



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# File 'lib/nanoc/base/compilation/compiler.rb', line 195

def preprocess
  rules_collection.preprocessors.each_value do |preprocessor|
    preprocessor_context.instance_eval(&preprocessor)
  end
end

- (Object) route_reps

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Determines the paths of all item representations.



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# File 'lib/nanoc/base/compilation/compiler.rb', line 231

def route_reps
  reps.each do |rep|
    # Find matching rules
    rules = rules_collection.routing_rules_for(rep)
    raise Nanoc::Errors::NoMatchingRoutingRuleFound.new(rep) if rules[:last].nil?

    rules.each_pair do |snapshot, rule|
      # Get basic path by applying matching rule
      basic_path = rule.apply_to(rep, compiler: self)
      next if basic_path.nil?
      if basic_path !~ %r{^/}
        raise "The path returned for the #{rep.inspect} item representation, “#{basic_path}”, does not start with a slash. Please ensure that all routing rules return a path that starts with a slash."
      end

      # Get raw path by prepending output directory
      rep.raw_paths[snapshot] = @site.config[:output_dir] + basic_path

      # Get normal path by stripping index filename
      rep.paths[snapshot] = basic_path
      @site.config[:index_filenames].each do |index_filename|
        rep_path_ending = rep.paths[snapshot][-index_filename.length..-1]
        next unless rep_path_ending == index_filename

        # Strip and stop
        rep.paths[snapshot] = rep.paths[snapshot][0..-index_filename.length - 1]
        break
      end
    end
  end
end

- (Nanoc::RulesCollection) rules_collection

Returns The collection of rules to be used for compiling this site

Returns:



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# File 'lib/nanoc/base/compilation/compiler.rb', line 101

def rules_collection
  Nanoc::RulesCollection.new(self)
end

- (void) run

Compiles the site and writes out the compiled item representations.

Previous versions of nanoc (< 3.2) allowed passing items to compile, and had a “force” option to make the compiler recompile all pages, even when not outdated. These arguments and options are, as of nanoc 3.2, no longer used, and will simply be ignored when passed to #run.

This method returns an undefined value.



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# File 'lib/nanoc/base/compilation/compiler.rb', line 75

def run(*_args)
  # Create output directory if necessary
  FileUtils.mkdir_p(@site.config[:output_dir])

  # Compile reps
  load
  @site.freeze

  # Determine which reps need to be recompiled
  forget_dependencies_if_outdated(items)

  dependency_tracker.start
  compile_reps(reps)
  dependency_tracker.stop
  store
ensure
  Nanoc::TempFilenameFactory.instance.cleanup(
    Nanoc::Filter::TMP_BINARY_ITEMS_DIR)
  Nanoc::TempFilenameFactory.instance.cleanup(
    Nanoc::ItemRep::TMP_TEXT_ITEMS_DIR)
end

- (void) store

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Store the modified helper data used for compiling the site.



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# File 'lib/nanoc/base/compilation/compiler.rb', line 164

def store
  # Calculate rule memory
  (reps + layouts).each do |obj|
    rule_memory_store[obj] = rule_memory_calculator[obj]
  end

  # Calculate checksums
  objects.each do |obj|
    checksum_store[obj] = obj.checksum
  end

  # Store
  stores.each(&:store)
end

- (void) unload

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Undoes the effects of #load. Used when #load raises an exception.



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# File 'lib/nanoc/base/compilation/compiler.rb', line 141

def unload
  return if @unloading
  @unloading = true

  stores.each(&:unload)

  @stack = []

  items.each { |item| item.reps.clear }
  site.teardown_child_parent_links
  rules_collection.unload

  site.unload

  @loaded = false
  @unloading = false
end