template.rb in asciidoctor-2.0.0.rc.1

- old
+ new
@@ -1,309 +1,268 @@
-# encoding: UTF-8
+# frozen_string_literal: true
 module Asciidoctor
-  # A {Converter} implementation that uses templates composed in template
-  # languages supported by {https://github.com/rtomayko/tilt Tilt} to convert
-  # {AbstractNode} objects from a parsed AsciiDoc document tree to the backend
-  # format.
-  #
-  # The converter scans the specified directories for template files that are
-  # supported by Tilt. If an engine name (e.g., "slim") is specified in the
-  # options Hash passed to the constructor, the scan is restricted to template
-  # files that have a matching extension (e.g., ".slim"). The scanner trims any
-  # extensions from the basename of the file and uses the resulting name as the
-  # key under which to store the template. When the {Converter#convert} method
-  # is invoked, the transform argument is used to select the template from this
-  # table and use it to convert the node.
-  #
-  # For example, the template file "path/to/templates/paragraph.html.slim" will
-  # be registered as the "paragraph" transform. The template is then used to
-  # convert a paragraph {Block} object from the parsed AsciiDoc tree to an HTML
-  # backend format (e.g., "html5").
-  #
-  # As an optimization, scan results and templates are cached for the lifetime
-  # of the Ruby process. If the {https://rubygems.org/gems/concurrent-ruby
-  # concurrent-ruby} gem is installed, these caches are guaranteed to be thread
-  # safe. If this gem is not present, there is no such guarantee and a warning
-  # will be issued.
-  class Converter::TemplateConverter < Converter::Base
-    DEFAULT_ENGINE_OPTIONS = {
-      :erb =>  { :trim => '<' },
-      # TODO line 466 of haml/compiler.rb sorts the attributes; file an issue to make this configurable
-      # NOTE AsciiDoc syntax expects HTML/XML output to use double quotes around attribute values
-      :haml => { :format => :xhtml, :attr_wrapper => '"', :escape_attrs => false, :ugly => true },
-      :slim => { :disable_escape => true, :sort_attrs => false, :pretty => false }
-    }
+# A {Converter} implementation that uses templates composed in template
+# languages supported by {https://github.com/rtomayko/tilt Tilt} to convert
+# {AbstractNode} objects from a parsed AsciiDoc document tree to the backend
+# format.
+#
+# The converter scans the specified directories for template files that are
+# supported by Tilt. If an engine name (e.g., "slim") is specified in the
+# options Hash passed to the constructor, the scan is restricted to template
+# files that have a matching extension (e.g., ".slim"). The scanner trims any
+# extensions from the basename of the file and uses the resulting name as the
+# key under which to store the template. When the {Converter#convert} method
+# is invoked, the transform argument is used to select the template from this
+# table and use it to convert the node.
+#
+# For example, the template file "path/to/templates/paragraph.html.slim" will
+# be registered as the "paragraph" transform. The template is then used to
+# convert a paragraph {Block} object from the parsed AsciiDoc tree to an HTML
+# backend format (e.g., "html5").
+#
+# As an optimization, scan results and templates are cached for the lifetime
+# of the Ruby process. If the {https://rubygems.org/gems/concurrent-ruby
+# concurrent-ruby} gem is installed, these caches are guaranteed to be thread
+# safe. If this gem is not present, there is no such guarantee and a warning
+# will be issued.
+class Converter::TemplateConverter < Converter::Base
+  DEFAULT_ENGINE_OPTIONS = {
+    erb: { trim: 0 },
+    # TODO line 466 of haml/compiler.rb sorts the attributes; file an issue to make this configurable
+    # NOTE AsciiDoc syntax expects HTML/XML output to use double quotes around attribute values
+    haml: { format: :xhtml, attr_wrapper: '"', escape_attrs: false, ugly: true },
+    slim: { disable_escape: true, sort_attrs: false, pretty: false },
+  }
 
-    begin
-      unless defined? ::Concurrent::Hash
-        require ::RUBY_MIN_VERSION_1_9 ? 'concurrent/hash' : 'asciidoctor/core_ext/1.8.7/concurrent/hash'
-      end
-      @caches = { :scans => ::Concurrent::Hash.new, :templates => ::Concurrent::Hash.new }
-    rescue ::LoadError
-      @caches = { :scans => {}, :templates => {} }
-    end
+  begin
+    require 'concurrent/hash' unless defined? ::Concurrent::Hash
+    @caches = { scans: ::Concurrent::Hash.new, templates: ::Concurrent::Hash.new }
+  rescue ::LoadError
+    @caches = { scans: {}, templates: {} }
+  end
 
-    def self.caches
-      @caches
-    end
+  def self.caches
+    @caches
+  end
 
-    def self.clear_caches
-      @caches[:scans].clear if @caches[:scans]
-      @caches[:templates].clear if @caches[:templates]
-    end
+  def self.clear_caches
+    @caches[:scans].clear if @caches[:scans]
+    @caches[:templates].clear if @caches[:templates]
+  end
 
-    def initialize backend, template_dirs, opts = {}
-      Helpers.require_library 'tilt' unless defined? ::Tilt
-      @backend = backend
-      @templates = {}
-      @template_dirs = template_dirs
-      @eruby = opts[:eruby]
-      @safe = opts[:safe]
-      @active_engines = {}
-      @engine = opts[:template_engine]
-      @engine_options = DEFAULT_ENGINE_OPTIONS.inject({}) do |accum, (engine, default_opts)|
-        accum[engine] = default_opts.dup
-        accum
+  def initialize backend, template_dirs, opts = {}
+    Helpers.require_library 'tilt' unless defined? ::Tilt.new
+    @backend = backend
+    @templates = {}
+    @template_dirs = template_dirs
+    @eruby = opts[:eruby]
+    @safe = opts[:safe]
+    @active_engines = {}
+    @engine = opts[:template_engine]
+    @engine_options = {}.tap {|accum| DEFAULT_ENGINE_OPTIONS.each {|engine, engine_opts| accum[engine] = engine_opts.dup } }
+    if opts[:htmlsyntax] == 'html' # if not set, assume xml since this converter is also used for DocBook (which doesn't specify htmlsyntax)
+      @engine_options[:haml][:format] = :html5
+      @engine_options[:slim][:format] = :html
+    end
+    @engine_options[:slim][:include_dirs] = template_dirs.reverse.map {|dir| ::File.expand_path dir }
+    if (overrides = opts[:template_engine_options])
+      overrides.each do |engine, override_opts|
+        (@engine_options[engine] ||= {}).update override_opts
       end
-      if opts[:htmlsyntax] == 'html'
-        @engine_options[:haml][:format] = :html5
-        @engine_options[:slim][:format] = :html
-      end
-      @engine_options[:slim][:include_dirs] = template_dirs.reverse.map {|dir| ::File.expand_path dir }
-      if (overrides = opts[:template_engine_options])
-        overrides.each do |engine, override_opts|
-          (@engine_options[engine] ||= {}).update override_opts
-        end
-      end
-      case opts[:template_cache]
-      when true
-        logger.warn 'gem \'concurrent-ruby\' is not installed. This gem is recommended when using the built-in template cache.' unless defined? ::Concurrent::Hash
-        @caches = self.class.caches
-      when ::Hash
-        @caches = opts[:template_cache]
-      else
-        @caches = {} # the empty Hash effectively disables caching
-      end
-      scan
-      #create_handlers
     end
+    case opts[:template_cache]
+    when true
+      logger.warn 'gem \'concurrent-ruby\' is not installed. This gem is recommended when using the built-in template cache.' unless defined? ::Concurrent::Hash
+      @caches = self.class.caches
+    when ::Hash
+      @caches = opts[:template_cache]
+    else
+      @caches = {} # the empty Hash effectively disables caching
+    end
+    scan
+  end
 
-=begin
-    # Public: Called when this converter is added to a composite converter.
-    def composed parent
-      # TODO set the backend info determined during the scan
+  # Public: Convert an {AbstractNode} to the backend format using the named template.
+  #
+  # Looks for a template that matches the value of the template name or, if the template name is not specified, the
+  # value of the {AbstractNode#node_name} property.
+  #
+  # node          - the AbstractNode to convert
+  # template_name - the String name of the template to use, or the value of
+  #                 the node_name property on the node if a template name is
+  #                 not specified. (optional, default: nil)
+  # opts          - an optional Hash that is passed as local variables to the
+  #                 template. (optional, default: nil)
+  #
+  # Returns the [String] result from rendering the template
+  def convert node, template_name = nil, opts = nil
+    unless (template = @templates[template_name ||= node.node_name])
+      raise %(Could not find a custom template to handle transform: #{template_name})
     end
-=end
 
-    # Internal: Scans the template directories specified in the constructor for Tilt-supported
-    # templates, loads the templates and stores the in a Hash that is accessible via the
-    # {TemplateConverter#templates} method.
-    #
-    # Returns nothing
-    def scan
-      path_resolver = PathResolver.new
-      backend = @backend
-      engine = @engine
-      @template_dirs.each do |template_dir|
-        # FIXME need to think about safe mode restrictions here
-        next unless ::File.directory?(template_dir = (path_resolver.system_path template_dir))
+    # Slim doesn't include helpers in the template's execution scope (like HAML), so do it ourselves
+    node.extend ::Slim::Helpers if (defined? ::Slim::Helpers) && (::Slim::Template === template)
 
-        if engine
-          file_pattern = %(*.#{engine})
-          # example: templates/haml
-          if ::File.directory?(engine_dir = %(#{template_dir}/#{engine}))
-            template_dir = engine_dir
-          end
-        else
-          # NOTE last matching template wins for template name if no engine is given
-          file_pattern = '*'
-        end
+    # NOTE opts become locals in the template
+    if template_name == 'document'
+      (template.render node, opts).strip
+    else
+      (template.render node, opts).rstrip
+    end
+  end
 
-        # example: templates/html5 (engine not set) or templates/haml/html5 (engine set)
-        if ::File.directory?(backend_dir = %(#{template_dir}/#{backend}))
-          template_dir = backend_dir
-        end
+  # Public: Checks whether there is a Tilt template registered with the specified name.
+  #
+  # name - the String template name
+  #
+  # Returns a [Boolean] that indicates whether a Tilt template is registered for the
+  # specified template name.
+  def handles? name
+    @templates.key? name
+  end
 
-        pattern = %(#{template_dir}/#{file_pattern})
+  # Public: Retrieves the templates that this converter manages.
+  #
+  # Returns a [Hash] of Tilt template objects keyed by template name.
+  def templates
+    @templates.dup
+  end
 
-        if (scan_cache = @caches[:scans])
-          template_cache = @caches[:templates]
-          unless (templates = scan_cache[pattern])
-            templates = (scan_cache[pattern] = (scan_dir template_dir, pattern, template_cache))
-          end
-          templates.each do |name, template|
-            @templates[name] = template_cache[template.file] = template
-          end
-        else
-          @templates.update scan_dir(template_dir, pattern, @caches[:templates])
-        end
-        nil
-      end
+  # Public: Registers a Tilt template with this converter.
+  #
+  # name     - the String template name
+  # template - the Tilt template object to register
+  #
+  # Returns the Tilt template object
+  def register name, template
+    @templates[name] = if (template_cache = @caches[:templates])
+      template_cache[template.file] = template
+    else
+      template
     end
+    #create_handler name, template
+  end
 
-=begin
-    # Internal: Creates convert methods (e.g., inline_anchor) that delegate to the discovered templates.
-    #
-    # Returns nothing
-    def create_handlers
-      @templates.each do |name, template|
-        create_handler name, template
-      end
-      nil
-    end
+  private
 
-    # Internal: Creates a convert method for the specified name that delegates to the specified template.
-    #
-    # Returns nothing
-    def create_handler name, template
-      metaclass = class << self; self; end
-      if name == 'document'
-        metaclass.send :define_method, name do |node|
-          (template.render node).strip
+  # Internal: Scans the template directories specified in the constructor for Tilt-supported
+  # templates, loads the templates and stores the in a Hash that is accessible via the
+  # {TemplateConverter#templates} method.
+  #
+  # Returns nothing
+  def scan
+    path_resolver = PathResolver.new
+    backend = @backend
+    engine = @engine
+    @template_dirs.each do |template_dir|
+      # FIXME need to think about safe mode restrictions here
+      next unless ::File.directory?(template_dir = (path_resolver.system_path template_dir))
+
+      if engine
+        file_pattern = %(*.#{engine})
+        # example: templates/haml
+        if ::File.directory?(engine_dir = %(#{template_dir}/#{engine}))
+          template_dir = engine_dir
         end
       else
-        metaclass.send :define_method, name do |node|
-          (template.render node).rstrip
-        end
+        # NOTE last matching template wins for template name if no engine is given
+        file_pattern = '*'
       end
-    end
-=end
 
-    # Public: Convert an {AbstractNode} to the backend format using the named template.
-    #
-    # Looks for a template that matches the value of the
-    # {AbstractNode#node_name} property if a template name is not specified.
-    #
-    # node          - the AbstractNode to convert
-    # template_name - the String name of the template to use, or the value of
-    #                 the node_name property on the node if a template name is
-    #                 not specified. (optional, default: nil)
-    # opts          - an optional Hash that is passed as local variables to the
-    #                 template. (optional, default: {})
-    #
-    # Returns the [String] result from rendering the template
-    def convert node, template_name = nil, opts = {}
-      template_name ||= node.node_name
-      unless (template = @templates[template_name])
-        raise %(Could not find a custom template to handle transform: #{template_name})
+      # example: templates/html5 (engine not set) or templates/haml/html5 (engine set)
+      if ::File.directory?(backend_dir = %(#{template_dir}/#{backend}))
+        template_dir = backend_dir
       end
 
-      # Slim doesn't include helpers in the template's execution scope (like HAML), so do it ourselves
-      node.extend ::Slim::Helpers if (defined? ::Slim::Helpers) && (::Slim::Template === template)
+      pattern = %(#{template_dir}/#{file_pattern})
 
-      # NOTE opts become locals in the template
-      if template_name == 'document'
-        (template.render node, opts).strip
+      if (scan_cache = @caches[:scans])
+        template_cache = @caches[:templates]
+        unless (templates = scan_cache[pattern])
+          templates = scan_cache[pattern] = scan_dir template_dir, pattern, template_cache
+        end
+        templates.each do |name, template|
+          @templates[name] = template_cache[template.file] = template
+        end
       else
-        (template.render node, opts).rstrip
+        @templates.update scan_dir(template_dir, pattern, @caches[:templates])
       end
+      nil
     end
+  end
 
-    # Public: Checks whether there is a Tilt template registered with the specified name.
-    #
-    # name - the String template name
-    #
-    # Returns a [Boolean] that indicates whether a Tilt template is registered for the
-    # specified template name.
-    def handles? name
-      @templates.key? name
-    end
-
-    # Public: Retrieves the templates that this converter manages.
-    #
-    # Returns a [Hash] of Tilt template objects keyed by template name.
-    def templates
-      @templates.dup
-    end
-
-    # Public: Registers a Tilt template with this converter.
-    #
-    # name     - the String template name
-    # template - the Tilt template object to register
-    #
-    # Returns the Tilt template object
-    def register name, template
-      @templates[name] = if (template_cache = @caches[:templates])
-        template_cache[template.file] = template
-      else
-        template
+  # Internal: Scan the specified directory for template files matching pattern and instantiate
+  # a Tilt template for each matched file.
+  #
+  # Returns the scan result as a [Hash]
+  def scan_dir template_dir, pattern, template_cache = nil
+    result, helpers = {}, nil
+    # Grab the files in the top level of the directory (do not recurse)
+    ::Dir.glob(pattern).select {|match| ::File.file? match }.each do |file|
+      if (basename = ::File.basename file) == 'helpers.rb'
+        helpers = file
+        next
+      elsif (path_segments = basename.split '.').size < 2
+        next
       end
-      #create_handler name, template
-    end
-
-    # Internal: Scan the specified directory for template files matching pattern and instantiate
-    # a Tilt template for each matched file.
-    #
-    # Returns the scan result as a [Hash]
-    def scan_dir template_dir, pattern, template_cache = nil
-      result, helpers = {}, nil
-      # Grab the files in the top level of the directory (do not recurse)
-      ::Dir.glob(pattern).select {|match| ::File.file? match }.each do |file|
-        if (basename = ::File.basename file) == 'helpers.rb'
-          helpers = file
+      if (name = path_segments[0]) == 'block_ruler'
+        name = 'thematic_break'
+      elsif name.start_with? 'block_'
+        name = name.slice 6, name.length
+      end
+      unless template_cache && (template = template_cache[file])
+        template_class, extra_engine_options, extsym = ::Tilt, {}, path_segments[-1].to_sym
+        case extsym
+        when :slim
+          unless @active_engines[extsym]
+            # NOTE slim doesn't get automatically loaded by Tilt
+            Helpers.require_library 'slim' unless defined? ::Slim::Engine
+            require 'slim/include' unless defined? ::Slim::Include
+            ::Slim::Engine.define_options asciidoc: {}
+            # align safe mode of AsciiDoc embedded in Slim template with safe mode of current document
+            # NOTE safe mode won't get updated if using template cache and changing safe mode
+            (@engine_options[extsym][:asciidoc] ||= {})[:safe] ||= @safe if @safe
+            @active_engines[extsym] = true
+          end
+        when :haml
+          unless @active_engines[extsym]
+            Helpers.require_library 'haml' unless defined? ::Haml::Engine
+            # NOTE Haml 5 dropped support for pretty printing
+            @engine_options[extsym].delete :ugly if defined? ::Haml::TempleEngine
+            @active_engines[extsym] = true
+          end
+        when :erb
+          template_class, extra_engine_options = (@active_engines[extsym] ||= (load_eruby @eruby))
+        when :rb
           next
-        elsif (path_segments = basename.split '.').size < 2
-          next
+        else
+          next unless ::Tilt.registered? extsym.to_s
         end
-        if (name = path_segments[0]) == 'block_ruler'
-          name = 'thematic_break'
-        elsif name.start_with? 'block_'
-          name = name.slice 6, name.length
-        end
-        unless template_cache && (template = template_cache[file])
-          template_class, extra_engine_options, extsym = ::Tilt, {}, path_segments[-1].to_sym
-          case extsym
-          when :slim
-            unless @active_engines[extsym]
-              # NOTE slim doesn't get automatically loaded by Tilt
-              Helpers.require_library 'slim' unless defined? ::Slim
-              ::Slim::Engine.define_options :asciidoc => {}
-              # align safe mode of AsciiDoc embedded in Slim template with safe mode of current document
-              # NOTE safe mode won't get updated if using template cache and changing safe mode
-              (@engine_options[extsym][:asciidoc] ||= {})[:safe] ||= @safe if @safe && ::Slim::VERSION >= '3.0'
-              # load include plugin when using Slim >= 2.1
-              require 'slim/include' unless (defined? ::Slim::Include) || ::Slim::VERSION < '2.1'
-              @active_engines[extsym] = true
-            end
-          when :haml
-            unless @active_engines[extsym]
-              Helpers.require_library 'haml' unless defined? ::Haml
-              # NOTE Haml 5 dropped support for pretty printing
-              @engine_options[extsym].delete :ugly if defined? ::Haml::TempleEngine
-              @active_engines[extsym] = true
-            end
-          when :erb
-            template_class, extra_engine_options = (@active_engines[extsym] ||= (load_eruby @eruby))
-          when :rb
-            next
-          else
-            next unless ::Tilt.registered? extsym.to_s
-          end
-          template = template_class.new file, 1, (@engine_options[extsym] ||= {}).merge(extra_engine_options)
-        end
-        result[name] = template
+        template = template_class.new file, 1, (@engine_options[extsym] ||= {}).merge(extra_engine_options)
       end
-      if helpers || ::File.file?(helpers = %(#{template_dir}/helpers.rb))
-        require helpers
-      end
-      result
+      result[name] = template
     end
+    if helpers || ::File.file?(helpers = %(#{template_dir}/helpers.rb))
+      require helpers
+    end
+    result
+  end
 
-    # Internal: Load the eRuby implementation
-    #
-    # name - the String name of the eRuby implementation
-    #
-    # Returns an [Array] containing the Tilt template Class for the eRuby implementation
-    # and a Hash of additional options to pass to the initializer
-    def load_eruby name
-      if !name || name == 'erb'
-        require 'erb' unless defined? ::ERB
-        [::Tilt::ERBTemplate, {}]
-      elsif name == 'erubis'
-        Helpers.require_library 'erubis' unless defined? ::Erubis::FastEruby
-        [::Tilt::ErubisTemplate, { :engine_class => ::Erubis::FastEruby }]
-      else
-        raise ::ArgumentError, %(Unknown ERB implementation: #{name})
-      end
+  # Internal: Load the eRuby implementation
+  #
+  # name - the String name of the eRuby implementation
+  #
+  # Returns an [Array] containing the Tilt template Class for the eRuby implementation
+  # and a Hash of additional options to pass to the initializer
+  def load_eruby name
+    if !name || name == 'erb'
+      require 'erb' unless defined? ::ERB.version
+      [::Tilt::ERBTemplate, {}]
+    elsif name == 'erubis'
+      Helpers.require_library 'erubis' unless defined? ::Erubis::FastEruby
+      [::Tilt::ErubisTemplate, { engine_class: ::Erubis::FastEruby }]
+    else
+      raise ::ArgumentError, %(Unknown ERB implementation: #{name})
     end
   end
+end
 end