discourse/lib/es6_module_transpiler/tilt/es6_module_transpiler_templ...

197 lines
5.8 KiB
Ruby
Raw Normal View History

require 'execjs'
require 'babel/transpiler'
require 'mini_racer'
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
2016-04-21 19:52:12 -04:00
# timeout any eval that takes longer than 15 seconds
ctx = MiniRacer::Context.new(timeout: 15000)
ctx.eval("var self = this; #{File.read(Babel::Transpiler.script_path)}")
ctx.eval("module = {}; exports = {};");
ctx.load("#{Rails.root}/lib/es6_module_transpiler/support/es6-module-transpiler.js")
ctx.attach("rails.logger.info", proc{|err| Rails.logger.info(err.to_s)})
ctx.attach("rails.logger.error", proc{|err| Rails.logger.error(err.to_s)})
ctx.eval <<JS
console = {
prefix: "",
log: function(msg){ rails.logger.info(console.prefix + msg); },
error: function(msg){ rails.logger.error(console.prefix + msg); }
}
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
@mutex.synchronize do
yield
end
end
def whitelisted?(path)
@@whitelisted ||= Set.new(
["discourse/models/nav-item",
"discourse/models/user-action",
"discourse/routes/discourse",
"discourse/models/category",
"discourse/models/trust-level",
"discourse/models/site",
"discourse/models/user",
"discourse/models/session",
"discourse/models/model",
"discourse/models/topic",
"discourse/models/post",
"discourse/views/grouped"]
)
@@whitelisted.include?(path) || path =~ /discourse\/mixins/
end
def babel_transpile(source)
klass = self.class
klass.protect do
klass.v8.eval("console.prefix = 'BABEL: babel-eval: ';")
@output = klass.v8.eval(babel_source(source))
end
end
def module_transpile(source, root_path, logical_path)
klass = self.class
klass.protect do
klass.v8.eval("console.prefix = 'BABEL: babel-eval: ';")
transpiled = babel_source(source)
compiler_source = "new module.exports.Compiler(#{transpiled}, '#{module_name(root_path, logical_path)}', #{compiler_options}).#{compiler_method}()"
@output = klass.v8.eval(compiler_source)
end
end
def evaluate(scope, locals, &block)
return @output if @output
klass = self.class
klass.protect do
klass.v8.eval("console.prefix = 'BABEL: #{scope.logical_path}: ';")
@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 whitelisted?(scope.logical_path) &&
scope.logical_path =~ /(discourse|admin)\/(controllers|components|views|routes|mixins|models)\/(.*)/
type = Regexp.last_match[2]
file_name = Regexp.last_match[3].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)
if require_name !~ /\-test$/ && require_name !~ /^discourse\/plugins\//
2014-08-12 19:04:36 -04:00
result = "#{class_name}#{type.classify}"
# HAX
result = "Controller" if result == "ControllerController"
result = "Route" if result == "DiscourseRoute"
2015-04-08 14:17:21 -04:00
result = "View" if result == "ViewView"
2014-08-12 19:04:36 -04:00
result.gsub!(/Mixin$/, '')
result.gsub!(/Model$/, '')
2014-08-12 19:04:36 -04:00
if result != "PostMenuView"
@output << "\n\nDiscourse.#{result} = require('#{require_name}').default;\n"
end
end
end
@output
end
def babel_source(source)
js_source = ::JSON.generate(source, quirks_mode: true)
"babel.transform(#{js_source}, {ast: false, whitelist: ['es6.constants', 'es6.properties.shorthand', 'es6.arrowFunctions', 'es6.blockScoping', 'es6.destructuring', 'es6.spread', 'es6.parameters', 'es6.templateLiterals', 'es6.regex.unicode', 'es7.decorators', 'es6.classes']})['code']"
end
private
def generate_source(scope)
js_source = babel_source(data)
2015-02-06 13:25:48 -05:00
"new module.exports.Compiler(#{js_source}, '#{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