Class: Bluenode::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/bluenode/context.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(basedir = Dir.pwd, env = ENV.dup, stdout = $stdout, stderr = $stderr) ⇒ Context

Returns a new instance of Context.



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# File 'lib/bluenode/context.rb', line 39

def initialize(basedir = Dir.pwd, env = ENV.dup, stdout = $stdout, stderr = $stderr)
  @runtime  = V8::Context.new
  @basedir  = basedir.to_s

  startup env, stdout, stderr
end

Instance Attribute Details

#basedir ⇒ Object (readonly)

Returns the value of attribute basedir.



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# File 'lib/bluenode/context.rb', line 37

def basedir
  @basedir
end

#runtime ⇒ Object (readonly)

Returns the value of attribute runtime.



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# File 'lib/bluenode/context.rb', line 37

def runtime
  @runtime
end

Class Method Details

.main(basedir = Dir.pwd) ⇒ Object 



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# File 'lib/bluenode/context.rb', line 7

def main(basedir = Dir.pwd)
  context = new(basedir)
  context.require './'
end

.node_module_paths(from) ⇒ Object 



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# File 'lib/bluenode/context.rb', line 12

def node_module_paths(from)
  from = File.expand_path(from)

  split_re  = windows? && /[\/\\]/ || /\//
  paths     = []
  parts     = from.split(split_re)
  tip       = parts.size - 1

  while tip >= 0
    if parts[tip] != 'node_modules'
      dir = File.join(*parts[0..tip], 'node_modules')
      paths << dir
    end

    tip -= 1
  end

  paths
end

.windows? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bluenode/context.rb', line 32

def windows?
  @windows ||= !!(RbConfig::CONFIG['host_os'] =~ /mswin|mingw|cygwin/)
end

Instance Method Details

#eval_as_module(script, name = '[eval]', is_main = false) ⇒ Object 



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# File 'lib/bluenode/context.rb', line 50

def eval_as_module(script, name = '[eval]', is_main = false)
  Module.new(self, name).tap do |mod|
    mod.filename  = File.join(basedir, name)
    mod.paths     = self.class.node_module_paths(basedir)

    if is_main
      runtime['process'].mainModule = mod
      mod.id = '.'
    end

    mod.send :compile, script, "#{name}-wrapper"
  end
end

#extensions ⇒ Object 



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# File 'lib/bluenode/context.rb', line 91

def extensions
  @extensions ||= {}.tap do |extensions|
    extensions['.js'] = lambda do |mod, filename|
      mod.send :compile, File.read(filename), filename
    end

    extensions['.json'] = lambda do |mod, filename|
      begin
        mod.exports = JSON.parse(File.read(filename))
      rescue => exc
        raise $!, "#{filename}: #{$!}", $!.backtrace
      end
    end

    extensions['.node'] = lambda do |mod, filename|
      raise 'requiring modules with a .node extension is not supported'
    end
  end
end

#find_path(request, paths) ⇒ Object 



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# File 'lib/bluenode/context.rb', line 131

def find_path(request, paths)
  exts  = extensions.keys
  paths = [''] if request[0] == '/'
  trailing_slash = request[-1] == '/'
  cache_key = { request: request, paths: paths }.to_json

  return path_cache[cache_key] if path_cache.key?(cache_key)

  i, ii = 0, paths.size

  while i < ii
    base_path = File.expand_path(request, paths[i])
    filename = nil

    unless trailing_slash
      filename = try_file(base_path)
      filename = try_extensions(base_path, exts) unless filename
    end

    filename = try_package(base_path, exts) unless filename
    filename = try_extensions(File.expand_path('index', base_path), exts) unless filename

    if filename
      path_cache[cache_key] = filename
      return filename
    end

    i += 1
  end

  false
end

#global_paths ⇒ Object 



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# File 'lib/bluenode/context.rb', line 111

def global_paths
  @global_paths ||= begin
    home_dir  = self.class.windows? && ENV['USERPROFILE'] || ENV['HOME']
    exec_path = `which node`.chomp

    paths = [File.expand_path(File.join('..', '..', 'lib', 'node'), exec_path)]

    if home_dir
      paths.unshift File.expand_path('.node_libraries', home_dir)
      paths.unshift File.expand_path('.node_modules', home_dir)
    end

    if node_path = ENV['NODE_PATH']
      paths = node_path.split(File::PATH_SEPARATOR).concat(paths)
    end

    paths
  end
end

#modules ⇒ Object 



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# File 'lib/bluenode/context.rb', line 87

def modules
  @modules ||= {}
end

#new_function(callable, props = {}) ⇒ Object 



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# File 'lib/bluenode/context.rb', line 75

def new_function(callable, props = {})
  @runtime.enter do
    function = @runtime.to_v8(callable)

    props.each do |name, value|
      function.Set @runtime.to_v8(name.to_s), @runtime.to_v8(value)
    end

    function
  end
end

#new_object ⇒ Object 



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# File 'lib/bluenode/context.rb', line 71

def new_object
  @runtime['Object'].new
end

#process ⇒ Object 



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# File 'lib/bluenode/context.rb', line 46

def process
  @runtime['process']
end

#require(path) ⇒ Object 



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# File 'lib/bluenode/context.rb', line 64

def require(path)
  script  = "module.exports = require('#{path}')"
  mod     = eval_as_module(script, '[main]', true)

  mod.exports
end