232 lines
7.9 KiB
Ruby
232 lines
7.9 KiB
Ruby
# frozen_string_literal: true
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require 'execjs'
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require 'mini_racer'
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module Tilt
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class ES6ModuleTranspilerTemplate < Tilt::Template
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self.default_mime_type = 'application/javascript'
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@mutex = Mutex.new
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@ctx_init = Mutex.new
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def self.call(input)
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filename = input[:filename]
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source = input[:data]
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context = input[:environment].context_class.new(input)
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result = new(filename) { source }.render(context)
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context.metadata.merge(data: result)
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end
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def prepare
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# intentionally left empty
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# Tilt requires this method to be defined
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end
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def self.create_new_context
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# timeout any eval that takes longer than 15 seconds
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ctx = MiniRacer::Context.new(timeout: 15000)
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ctx.eval("var self = this; #{File.read("#{Rails.root}/vendor/assets/javascripts/babel.js")}")
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ctx.eval(File.read(Ember::Source.bundled_path_for('ember-template-compiler.js')))
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ctx.eval("module = {}; exports = {};")
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ctx.attach("rails.logger.info", proc { |err| Rails.logger.info(err.to_s) })
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ctx.attach("rails.logger.error", proc { |err| Rails.logger.error(err.to_s) })
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ctx.eval <<JS
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console = {
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prefix: "",
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log: function(msg){ rails.logger.info(console.prefix + msg); },
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error: function(msg){ rails.logger.error(console.prefix + msg); }
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}
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JS
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source = File.read("#{Rails.root}/lib/javascripts/widget-hbs-compiler.js.es6")
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js_source = ::JSON.generate(source, quirks_mode: true)
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js = ctx.eval("Babel.transform(#{js_source}, { ast: false, plugins: ['check-es2015-constants', 'transform-es2015-arrow-functions', 'transform-es2015-block-scoped-functions', 'transform-es2015-block-scoping', 'transform-es2015-classes', 'transform-es2015-computed-properties', 'transform-es2015-destructuring', 'transform-es2015-duplicate-keys', 'transform-es2015-for-of', 'transform-es2015-function-name', 'transform-es2015-literals', 'transform-es2015-object-super', 'transform-es2015-parameters', 'transform-es2015-shorthand-properties', 'transform-es2015-spread', 'transform-es2015-sticky-regex', 'transform-es2015-template-literals', 'transform-es2015-typeof-symbol', 'transform-es2015-unicode-regex'] }).code")
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ctx.eval(js)
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ctx
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end
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def self.reset_context
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@ctx&.dispose
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@ctx = nil
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end
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def self.v8
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return @ctx if @ctx
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# ensure we only init one of these
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@ctx_init.synchronize do
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return @ctx if @ctx
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@ctx = create_new_context
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end
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@ctx
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end
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class JavaScriptError < StandardError
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attr_accessor :message, :backtrace
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def initialize(message, backtrace)
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@message = message
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@backtrace = backtrace
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end
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end
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def self.protect
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@mutex.synchronize do
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yield
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end
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end
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def whitelisted?(path)
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@@whitelisted ||= Set.new(
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["discourse/models/nav-item",
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"discourse/models/user-action",
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"discourse/routes/discourse",
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"discourse/models/category",
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"discourse/models/trust-level",
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"discourse/models/site",
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"discourse/models/user",
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"discourse/models/session",
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"discourse/models/model",
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"discourse/models/topic",
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"discourse/models/post",
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"discourse/views/grouped"]
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)
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@@whitelisted.include?(path) || path =~ /discourse\/mixins/
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end
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def babel_transpile(source)
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klass = self.class
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klass.protect do
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klass.v8.eval("console.prefix = 'BABEL: babel-eval: ';")
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@output = klass.v8.eval(babel_source(source))
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end
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end
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def module_transpile(source, root_path, logical_path)
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klass = self.class
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klass.protect do
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klass.v8.eval("console.prefix = 'BABEL: babel-eval: ';")
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transpiled = babel_source(
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source,
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module_name: module_name(root_path, logical_path),
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filename: logical_path
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)
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@output = klass.v8.eval(transpiled)
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end
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end
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def evaluate(scope, locals, &block)
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return @output if @output
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klass = self.class
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klass.protect do
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klass.v8.eval("console.prefix = 'BABEL: #{scope.logical_path}: ';")
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source = babel_source(
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data,
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module_name: module_name(scope.root_path, scope.logical_path),
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filename: scope.logical_path
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)
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@output = klass.v8.eval(source)
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end
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# For backwards compatibility with plugins, for now export the Global format too.
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# We should eventually have an upgrade system for plugins to use ES6 or some other
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# resolve based API.
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if whitelisted?(scope.logical_path) &&
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scope.logical_path =~ /(discourse|admin)\/(controllers|components|views|routes|mixins|models)\/(.*)/
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type = Regexp.last_match[2]
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file_name = Regexp.last_match[3].gsub(/[\-\/]/, '_')
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class_name = file_name.classify
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# Rails removes pluralization when calling classify
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if file_name.end_with?('s') && (!class_name.end_with?('s'))
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class_name << "s"
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end
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require_name = module_name(scope.root_path, scope.logical_path)
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if require_name !~ /\-test$/ && require_name !~ /^discourse\/plugins\//
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result = "#{class_name}#{type.classify}"
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# HAX
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result = "Controller" if result == "ControllerController"
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result = "Route" if result == "DiscourseRoute"
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result = "View" if result == "ViewView"
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result = result.gsub(/Mixin$/, '')
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result = result.gsub(/Model$/, '')
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if result != "PostMenuView"
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@output << "\n\nDiscourse.#{result} = require('#{require_name}').default;\n"
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end
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end
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end
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@output
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end
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def babel_source(source, opts = nil)
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opts ||= {}
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js_source = ::JSON.generate(source, quirks_mode: true)
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if opts[:module_name] && transpile_into_module?
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filename = opts[:filename] || 'unknown'
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"Babel.transform(#{js_source}, { moduleId: '#{opts[:module_name]}', filename: '#{filename}', ast: false, presets: ['es2015'], plugins: [['transform-es2015-modules-amd', {noInterop: true}], 'transform-decorators-legacy', exports.WidgetHbsCompiler] }).code"
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else
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"Babel.transform(#{js_source}, { ast: false, plugins: ['check-es2015-constants', 'transform-es2015-arrow-functions', 'transform-es2015-block-scoped-functions', 'transform-es2015-block-scoping', 'transform-es2015-classes', 'transform-es2015-computed-properties', 'transform-es2015-destructuring', 'transform-es2015-duplicate-keys', 'transform-es2015-for-of', 'transform-es2015-function-name', 'transform-es2015-literals', 'transform-es2015-object-super', 'transform-es2015-parameters', 'transform-es2015-shorthand-properties', 'transform-es2015-spread', 'transform-es2015-sticky-regex', 'transform-es2015-template-literals', 'transform-es2015-typeof-symbol', 'transform-es2015-unicode-regex', 'transform-regenerator', 'transform-decorators-legacy', exports.WidgetHbsCompiler] }).code"
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end
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end
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private
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def transpile_into_module?
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file.nil? || file.exclude?('.no-module')
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end
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def module_name(root_path, logical_path)
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path = nil
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root_base = File.basename(Rails.root)
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# If the resource is a plugin, use the plugin name as a prefix
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if root_path =~ /(.*\/#{root_base}\/plugins\/[^\/]+)\//
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plugin_path = "#{Regexp.last_match[1]}/plugin.rb"
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plugin = Discourse.plugins.find { |p| p.path == plugin_path }
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path = "discourse/plugins/#{plugin.name}/#{logical_path.sub(/javascripts\//, '')}" if plugin
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end
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path ||= logical_path
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if ES6ModuleTranspiler.transform
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path = ES6ModuleTranspiler.transform.call(path)
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end
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path
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end
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def compiler_method
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type = {
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amd: 'AMD',
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cjs: 'CJS',
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globals: 'Globals'
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}[ES6ModuleTranspiler.compile_to.to_sym]
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"to#{type}"
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end
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def compiler_options
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::JSON.generate(ES6ModuleTranspiler.compiler_options, quirks_mode: true)
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end
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end
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end
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