127 lines
3.5 KiB
Ruby
127 lines
3.5 KiB
Ruby
require 'execjs'
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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 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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ctx = V8::Context.new(timeout: 5000)
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ctx.eval("module = {}; exports = {};");
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ctx.load("#{Rails.root}/lib/es6_module_transpiler/support/es6-module-transpiler.js")
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ctx
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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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rval = nil
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@mutex.synchronize do
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begin
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rval = yield
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# This may seem a bit odd, but we don't want to leak out
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# objects that require locks on the v8 vm, to get a backtrace
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# you need a lock, if this happens in the wrong spot you can
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# deadlock a process
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rescue V8::Error => e
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raise JavaScriptError.new(e.message, e.backtrace)
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end
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end
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rval
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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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@output = klass.v8.eval(generate_source(scope))
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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 ENV['DISCOURSE_NO_CONSTANTS'].nil? && scope.logical_path =~ /discourse\/(controllers|components|views)\/(.*)/
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type = Regexp.last_match[1]
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file_name = Regexp.last_match[2].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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@output << "\n\nDiscourse.#{class_name}#{type.classify} = require('#{scope.logical_path}').default"
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end
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@output
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end
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private
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def generate_source(scope)
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"new module.exports.Compiler(#{::JSON.generate(data, quirks_mode: true)}, '#{module_name(scope.root_path, scope.logical_path)}', #{compiler_options}).#{compiler_method}()"
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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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