Class: Spade::Runtime::Loader

Inherits:
Object
  • Object
show all
Defined in:
lib/spade/runtime/loader.rb

Instance Method Summary collapse

Constructor Details

#initialize(ctx) ⇒ Loader

Returns a new instance of Loader.



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# File 'lib/spade/runtime/loader.rb', line 14

def initialize(ctx)
  @ctx = ctx
end

Instance Method Details

#discoverRoot(path) ⇒ Object 



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# File 'lib/spade/runtime/loader.rb', line 18

def discoverRoot(path)
  Spade.discover_root path
end

#exists(spade, id, formats) ⇒ Object

exposed to JS. Determines if the named id exists in the system



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# File 'lib/spade/runtime/loader.rb', line 102

def exists(spade, id, formats)
  
  # individual files
  return File.exists?(id[5..-1]) if id =~ /^file:\//

  parts = id.split '/'
  package_name = parts.shift
  package_info = packages[package_name]
  
  return false if package_info.nil?
  return true if parts.size==1 && parts[0] == '~package'
  
  dirname = extract_dirname(parts, package_info)
  
  
  filename = parts.pop
  base_path = package_info[:path]
  formats = ['js'] if formats.nil?
  formats.each do |fmt|
    cur_path = File.join(base_path, dirname, parts, filename+'.'+fmt)
    return true if File.exist? cur_path
  end
  
  rb_path = File.join(package_info[:path],dirname,parts, filename+'.rb')
  return File.exists? rb_path
end

#load_module(id, module_path, format, path) ⇒ Object 



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# File 'lib/spade/runtime/loader.rb', line 129

def load_module(id, module_path, format, path)
  module_contents = File.read(module_path).to_json # encode as string
  @ctx.eval("spade.register('#{id}',#{module_contents}, { format: #{format.to_s.to_json}, filename: #{path.to_s.to_json} });")
  nil
end

#load_ruby(id, rb_path) ⇒ Object 



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# File 'lib/spade/runtime/loader.rb', line 135

def load_ruby(id, rb_path)

  klass = Spade.exports_for rb_path
  exports = klass.nil? ? {} : klass.new(@ctx)
  @ctx['$__rb_exports__'] = exports

  @ctx.eval(%[(function() { 
    var exp = $__rb_exports__; 
    spade.register('#{id}', function(r,e,m) { m.exports = exp; }); 
  })();])

  @ctx['$__rb_exports__'] = nil
end

#loadFactory(spade, id, formats, done = nil) ⇒ Object

exposed to JS. Find the JS file on disk and register the module



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# File 'lib/spade/runtime/loader.rb', line 29

def loadFactory(spade, id, formats, done=nil)
  formats = formats.to_a # We may get a V8::Array, we want a normal one

  # load individual files
  if id =~ /^file:\//
    js_path = id[5..-1]
    if File.exists? js_path
      load_module id, js_path, ['js'], js_path
    end
    return nil
  end

  parts = id.split '/'
  package_name = parts.shift
  package_info = packages[package_name]
  skip_module  = false

  return nil if package_info.nil?

  if parts.size==1 && parts[0] == '~package'
    skip_module = true
  elsif parts.size==1 && parts[0] == 'main'
    parts = (package_info[:json]['main'] || 'lib/main').split('/')
    dirname = parts[0...-1]
    parts   = [parts[-1]]
  else
    dirname = extract_dirname(parts, package_info)
  end

  # register the package first - also make sure dependencies are 
  # registered since they are needed for loading plugins
  unless package_info[:registered]
    package_info[:registered] = true
    @ctx.eval "spade.register('#{package_name}', #{package_info[:json].to_json});"
    
    deps = package_info[:json]['dependencies'] || [];
    deps.each do |dep_name, ignored|
      dep_package_info = packages[dep_name]
      next unless dep_package_info && !dep_package_info[:registered]
      dep_package_info[:registered] = true
      @ctx.eval "spade.register('#{dep_name}', #{dep_package_info[:json].to_json});"

      # Add new formats if they are specified in our dependencies
      dep_formats = dep_package_info[:json]['plugin:formats']
      formats.unshift(*dep_formats.keys).uniq! if dep_formats
    end
          
  end
  
  unless skip_module
    filename = parts.pop
    base_path = package_info[:path]
    formats << ['js'] if formats.empty?
    formats.each do |fmt|
      cur_path = File.join(base_path, dirname, parts, filename+'.'+fmt)
      if File.exist? cur_path
        load_module id, cur_path, fmt, cur_path
        return nil
      end
    end
    
    rb_path = File.join(package_info[:path],dirname,parts, filename+'.rb')
    if File.exists? rb_path
      load_ruby id, rb_path
      return nil
    end
    
  end
  
  return nil
end

#packages ⇒ Object 



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# File 'lib/spade/runtime/loader.rb', line 149

def packages
  @packages unless @packages.nil?
  @packages = {}

  if defined?(Spade::Packager)
    package_paths = Dir.glob(File.join(LibGems.dir, 'gems', '*'))
    package_paths.each{|path| add_package(path) }
  end

  # in reverse order of precedence
  %w[.spade/packages vendor/cache vendor/packages packages].each do |p|
    package_paths = Dir.glob File.join(@ctx.rootdir, p.split('/'), '*')
    package_paths.each { |path| add_package(path) }
  end

  # add self
  add_package @ctx.rootdir

  @packages
end

#root(path = nil) ⇒ Object 



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# File 'lib/spade/runtime/loader.rb', line 22

def root(path=nil)
  return @ctx.rootdir if path.nil?
  @ctx.rootdir = path 
  @packages = nil
end