280 lines
8.8 KiB
Ruby
280 lines
8.8 KiB
Ruby
# frozen_string_literal: true
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require 'execjs'
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require 'mini_racer'
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class DiscourseJsProcessor
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DISCOURSE_COMMON_BABEL_PLUGINS = [
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'proposal-optional-chaining',
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['proposal-decorators', { legacy: true } ],
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'transform-template-literals',
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'proposal-class-properties',
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'proposal-class-static-block',
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'proposal-private-property-in-object',
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'proposal-private-methods',
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'proposal-numeric-separator',
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'proposal-logical-assignment-operators',
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'proposal-nullish-coalescing-operator',
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'proposal-json-strings',
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'proposal-optional-catch-binding',
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'transform-parameters',
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'proposal-async-generator-functions',
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'proposal-object-rest-spread',
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'proposal-export-namespace-from',
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]
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def self.plugin_transpile_paths
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@@plugin_transpile_paths ||= Set.new
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end
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def self.ember_cli?(filename)
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filename.include?("/app/assets/javascripts/discourse/dist/")
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end
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def self.call(input)
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root_path = input[:load_path] || ''
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logical_path = (input[:filename] || '').sub(root_path, '').gsub(/\.(js|es6).*$/, '').sub(/^\//, '')
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data = input[:data]
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if should_transpile?(input[:filename])
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data = transpile(data, root_path, logical_path)
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end
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# add sourceURL until we can do proper source maps
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if !Rails.env.production? && !ember_cli?(input[:filename])
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plugin_name = root_path[/\/plugins\/([\w-]+)\/assets/, 1]
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source_url = if plugin_name
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"plugins/#{plugin_name}/assets/javascripts/#{logical_path}"
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else
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logical_path
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end
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data = "eval(#{data.inspect} + \"\\n//# sourceURL=#{source_url}\");\n"
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end
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{ data: data }
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end
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def self.transpile(data, root_path, logical_path)
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transpiler = Transpiler.new(skip_module: skip_module?(data))
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transpiler.perform(data, root_path, logical_path)
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end
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def self.should_transpile?(filename)
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filename ||= ''
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# skip ember cli
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return false if ember_cli?(filename)
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# es6 is always transpiled
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return true if filename.end_with?(".es6") || filename.end_with?(".es6.erb")
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# For .js check the path...
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return false unless filename.end_with?(".js") || filename.end_with?(".js.erb")
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relative_path = filename.sub(Rails.root.to_s, '').sub(/^\/*/, '')
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js_root = "app/assets/javascripts"
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test_root = "test/javascripts"
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return false if relative_path.start_with?("#{js_root}/locales/")
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return false if relative_path.start_with?("#{js_root}/plugins/")
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return true if %w(
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start-discourse
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onpopstate-handler
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google-tag-manager
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google-universal-analytics-v3
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google-universal-analytics-v4
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activate-account
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auto-redirect
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embed-application
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app-boot
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).any? { |f| relative_path == "#{js_root}/#{f}.js" }
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return true if plugin_transpile_paths.any? { |prefix| relative_path.start_with?(prefix) }
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!!(relative_path =~ /^#{js_root}\/[^\/]+\// ||
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relative_path =~ /^#{test_root}\/[^\/]+\//)
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end
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def self.skip_module?(data)
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!!(data.present? && data =~ /^\/\/ discourse-skip-module$/)
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end
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class Transpiler
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@mutex = Mutex.new
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@ctx_init = Mutex.new
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def self.mutex
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@mutex
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end
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def self.load_file_in_context(ctx, path, wrap_in_module: nil)
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contents = File.read("#{Rails.root}/app/assets/javascripts/#{path}")
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if wrap_in_module
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contents = <<~JS
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define(#{wrap_in_module.to_json}, ["exports", "require"], function(exports, require){
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#{contents}
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});
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JS
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end
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ctx.eval(contents, filename: path)
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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, ensure_gc_after_idle: 2000)
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# General shims
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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.warn", proc { |err| Rails.logger.warn(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, filename: "environment-setup.js")
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window = {};
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console = {
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prefix: "[DiscourseJsProcessor] ",
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log: function(...args){ rails.logger.info(console.prefix + args.join(" ")); },
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warn: function(...args){ rails.logger.warn(console.prefix + args.join(" ")); },
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error: function(...args){ rails.logger.error(console.prefix + args.join(" ")); }
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};
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const DISCOURSE_COMMON_BABEL_PLUGINS = #{DISCOURSE_COMMON_BABEL_PLUGINS.to_json};
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JS
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# define/require support
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load_file_in_context(ctx, "mini-loader.js")
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# Babel
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load_file_in_context(ctx, "node_modules/@babel/standalone/babel.js")
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# Template Compiler
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load_file_in_context(ctx, "node_modules/ember-source/dist/ember-template-compiler.js")
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load_file_in_context(ctx, "node_modules/babel-plugin-ember-template-compilation/src/plugin.js", wrap_in_module: "babel-plugin-ember-template-compilation/index")
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load_file_in_context(ctx, "node_modules/babel-plugin-ember-template-compilation/src/expression-parser.js", wrap_in_module: "babel-plugin-ember-template-compilation/expression-parser")
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load_file_in_context(ctx, "node_modules/babel-import-util/src/index.js", wrap_in_module: "babel-import-util")
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# Widget HBS compiler
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widget_hbs_compiler_source = File.read("#{Rails.root}/lib/javascripts/widget-hbs-compiler.js")
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widget_hbs_compiler_source = <<~JS
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define("widget-hbs-compiler", ["exports"], function(exports){
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#{widget_hbs_compiler_source}
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});
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JS
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widget_hbs_compiler_transpiled = ctx.eval <<~JS
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Babel.transform(
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#{widget_hbs_compiler_source.to_json},
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{
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ast: false,
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moduleId: 'widget-hbs-compiler',
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plugins: [
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...DISCOURSE_COMMON_BABEL_PLUGINS
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]
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}
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).code
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JS
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ctx.eval(widget_hbs_compiler_transpiled, filename: "widget-hbs-compiler.js")
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# Prepare template compiler plugins
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ctx.eval <<~JS
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const makeEmberTemplateCompilerPlugin = require("babel-plugin-ember-template-compilation").default;
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const precompile = require("ember-template-compiler").precompile;
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const DISCOURSE_TEMPLATE_COMPILER_PLUGINS = [
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require("widget-hbs-compiler").WidgetHbsCompiler,
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[makeEmberTemplateCompilerPlugin(() => precompile), { enableLegacyModules: ["ember-cli-htmlbars"] }],
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]
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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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def initialize(skip_module: false)
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@skip_module = skip_module
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end
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def perform(source, root_path = nil, logical_path = nil)
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klass = self.class
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klass.mutex.synchronize 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 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] && !@skip_module
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filename = opts[:filename] || 'unknown'
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<<~JS
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Babel.transform(
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#{js_source},
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{
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moduleId: '#{opts[:module_name]}',
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filename: '#{filename}',
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ast: false,
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plugins: [
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...DISCOURSE_TEMPLATE_COMPILER_PLUGINS,
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['transform-modules-amd', {noInterop: true}],
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...DISCOURSE_COMMON_BABEL_PLUGINS
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]
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}
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).code
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JS
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else
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<<~JS
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Babel.transform(
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#{js_source},
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{
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ast: false,
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plugins: [
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...DISCOURSE_TEMPLATE_COMPILER_PLUGINS,
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...DISCOURSE_COMMON_BABEL_PLUGINS
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]
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}
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).code
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JS
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end
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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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# We need to strip the app subdirectory to replicate how ember-cli works.
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path || logical_path&.gsub('app/', '')&.gsub('addon/', '')&.gsub('admin/addon', 'admin')
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end
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end
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end
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