128 lines
3.5 KiB
Ruby
128 lines
3.5 KiB
Ruby
require 'execjs'
|
|
|
|
module Tilt
|
|
class ES6ModuleTranspilerTemplate < Tilt::Template
|
|
self.default_mime_type = 'application/javascript'
|
|
|
|
@mutex = Mutex.new
|
|
@ctx_init = Mutex.new
|
|
|
|
def prepare
|
|
# intentionally left empty
|
|
# Tilt requires this method to be defined
|
|
end
|
|
|
|
def self.create_new_context
|
|
ctx = V8::Context.new(timeout: 5000)
|
|
ctx.eval("module = {}; exports = {};");
|
|
ctx.load("#{Rails.root}/lib/es6_module_transpiler/support/es6-module-transpiler.js")
|
|
ctx
|
|
end
|
|
|
|
def self.v8
|
|
return @ctx if @ctx
|
|
|
|
# ensure we only init one of these
|
|
@ctx_init.synchronize do
|
|
return @ctx if @ctx
|
|
@ctx = create_new_context
|
|
end
|
|
|
|
@ctx
|
|
end
|
|
|
|
class JavaScriptError < StandardError
|
|
attr_accessor :message, :backtrace
|
|
|
|
def initialize(message, backtrace)
|
|
@message = message
|
|
@backtrace = backtrace
|
|
end
|
|
|
|
end
|
|
|
|
def self.protect
|
|
rval = nil
|
|
@mutex.synchronize do
|
|
begin
|
|
rval = yield
|
|
# This may seem a bit odd, but we don't want to leak out
|
|
# objects that require locks on the v8 vm, to get a backtrace
|
|
# you need a lock, if this happens in the wrong spot you can
|
|
# deadlock a process
|
|
rescue V8::Error => e
|
|
raise JavaScriptError.new(e.message, e.backtrace)
|
|
end
|
|
end
|
|
rval
|
|
end
|
|
|
|
def evaluate(scope, locals, &block)
|
|
return @output if @output
|
|
|
|
klass = self.class
|
|
klass.protect do
|
|
@output = klass.v8.eval(generate_source(scope))
|
|
end
|
|
|
|
# For backwards compatibility with plugins, for now export the Global format too.
|
|
# We should eventually have an upgrade system for plugins to use ES6 or some other
|
|
# resolve based API.
|
|
if ENV['DISCOURSE_NO_CONSTANTS'].nil? && scope.logical_path =~ /discourse\/(controllers|components|views)\/(.*)/
|
|
type = Regexp.last_match[1]
|
|
file_name = Regexp.last_match[2].gsub(/[\-\/]/, '_')
|
|
class_name = file_name.classify
|
|
|
|
# Rails removes pluralization when calling classify
|
|
if file_name.end_with?('s') && (!class_name.end_with?('s'))
|
|
class_name << "s"
|
|
end
|
|
require_name = module_name(scope.root_path, scope.logical_path)
|
|
@output << "\n\nDiscourse.#{class_name}#{type.classify} = require('#{require_name}').default"
|
|
end
|
|
|
|
@output
|
|
end
|
|
|
|
private
|
|
|
|
def generate_source(scope)
|
|
"new module.exports.Compiler(#{::JSON.generate(data, quirks_mode: true)}, '#{module_name(scope.root_path, scope.logical_path)}', #{compiler_options}).#{compiler_method}()"
|
|
end
|
|
|
|
def module_name(root_path, logical_path)
|
|
path = nil
|
|
|
|
root_base = File.basename(Rails.root)
|
|
# If the resource is a plugin, use the plugin name as a prefix
|
|
if root_path =~ /(.*\/#{root_base}\/plugins\/[^\/]+)\//
|
|
plugin_path = "#{Regexp.last_match[1]}/plugin.rb"
|
|
|
|
plugin = Discourse.plugins.find {|p| p.path == plugin_path }
|
|
path = "discourse/plugins/#{plugin.name}/#{logical_path.sub(/javascripts\//, '')}" if plugin
|
|
end
|
|
|
|
path ||= logical_path
|
|
if ES6ModuleTranspiler.transform
|
|
path = ES6ModuleTranspiler.transform.call(path)
|
|
end
|
|
|
|
path
|
|
end
|
|
|
|
def compiler_method
|
|
type = {
|
|
amd: 'AMD',
|
|
cjs: 'CJS',
|
|
globals: 'Globals'
|
|
}[ES6ModuleTranspiler.compile_to.to_sym]
|
|
|
|
"to#{type}"
|
|
end
|
|
|
|
def compiler_options
|
|
::JSON.generate(ES6ModuleTranspiler.compiler_options, quirks_mode: true)
|
|
end
|
|
end
|
|
end
|