JezK
Edit File: external_runtime.rb
require "tmpdir" require "execjs/runtime" module ExecJS class ExternalRuntime < Runtime class Context < Runtime::Context def initialize(runtime, source = "", options = {}) source = encode(source) @runtime = runtime @source = source # Test compile context source exec("") end def eval(source, options = {}) source = encode(source) if /\S/ =~ source exec("return eval(#{::JSON.generate("(#{source})", quirks_mode: true)})") end end def exec(source, options = {}) source = encode(source) source = "#{@source}\n#{source}" if @source != "" source = @runtime.compile_source(source) tmpfile = write_to_tempfile(source) if ExecJS.cygwin? filepath = `cygpath -m #{tmpfile.path}`.rstrip else filepath = tmpfile.path end begin extract_result(@runtime.exec_runtime(filepath), filepath) ensure File.unlink(tmpfile) end end def call(identifier, *args) eval "#{identifier}.apply(this, #{::JSON.generate(args)})" end protected # See Tempfile.create on Ruby 2.1 def create_tempfile(basename) tmpfile = nil Dir::Tmpname.create(basename) do |tmpname| mode = File::WRONLY | File::CREAT | File::EXCL tmpfile = File.open(tmpname, mode, 0600) end tmpfile end def write_to_tempfile(contents) tmpfile = create_tempfile(['execjs', 'js']) tmpfile.write(contents) tmpfile.close tmpfile end def extract_result(output, filename) status, value, stack = output.empty? ? [] : ::JSON.parse(output, create_additions: false) if status == "ok" value else stack ||= "" real_filename = File.realpath(filename) stack = stack.split("\n").map do |line| line.sub(" at ", "") .sub(real_filename, "(execjs)") .sub(filename, "(execjs)") .strip end stack.reject! { |line| ["eval code", "eval@[native code]"].include?(line) } stack.shift unless stack[0].to_s.include?("(execjs)") error_class = value =~ /SyntaxError:/ ? RuntimeError : ProgramError error = error_class.new(value) error.set_backtrace(stack + caller) raise error end end end attr_reader :name def initialize(options) @name = options[:name] @command = options[:command] @runner_path = options[:runner_path] @encoding = options[:encoding] @deprecated = !!options[:deprecated] @binary = nil @popen_options = {} @popen_options[:external_encoding] = @encoding if @encoding @popen_options[:internal_encoding] = ::Encoding.default_internal || 'UTF-8' if @runner_path instance_eval generate_compile_method(@runner_path) end end def available? require 'json' binary ? true : false end def deprecated? @deprecated end private def binary @binary ||= which(@command) end def locate_executable(command) commands = Array(command) if ExecJS.windows? && File.extname(command) == "" ENV['PATHEXT'].split(File::PATH_SEPARATOR).each { |p| commands << (command + p) } end commands.find { |cmd| if File.executable? cmd cmd else path = ENV['PATH'].split(File::PATH_SEPARATOR).find { |p| full_path = File.join(p, cmd) File.executable?(full_path) && File.file?(full_path) } path && File.expand_path(cmd, path) end } end protected def generate_compile_method(path) <<-RUBY def compile_source(source) <<-RUNNER #{IO.read(path)} RUNNER end RUBY end def json2_source @json2_source ||= IO.read(ExecJS.root + "/support/json2.js") end def encode_source(source) encoded_source = encode_unicode_codepoints(source) ::JSON.generate("(function(){ #{encoded_source} })()", quirks_mode: true) end def encode_unicode_codepoints(str) str.gsub(/[\u0080-\uffff]/) do |ch| "\\u%04x" % ch.codepoints.to_a end end if ExecJS.windows? def exec_runtime(filename) path = Dir::Tmpname.create(['execjs', 'json']) {} begin command = binary.split(" ") << filename `#{shell_escape(*command)} 2>&1 > #{path}` output = File.open(path, 'rb', **@popen_options) { |f| f.read } ensure File.unlink(path) if path end if $?.success? output else raise exec_runtime_error(output) end end def shell_escape(*args) # see http://technet.microsoft.com/en-us/library/cc723564.aspx#XSLTsection123121120120 args.map { |arg| arg = %Q("#{arg.gsub('"','""')}") if arg.match(/[&|()<>^ "]/) arg }.join(" ") end elsif RUBY_ENGINE == 'jruby' require 'shellwords' def exec_runtime(filename) command = "#{Shellwords.join(binary.split(' ') << filename)} 2>&1" io = IO.popen(command, **@popen_options) output = io.read io.close if $?.success? output else raise exec_runtime_error(output) end end else def exec_runtime(filename) io = IO.popen(binary.split(' ') << filename, **(@popen_options.merge({err: [:child, :out]}))) output = io.read io.close if $?.success? output else raise exec_runtime_error(output) end end end # Internally exposed for Context. public :exec_runtime def exec_runtime_error(output) error = RuntimeError.new(output) lines = output.split("\n") lineno = lines[0][/:(\d+)$/, 1] if lines[0] lineno ||= 1 error.set_backtrace(["(execjs):#{lineno}"] + caller) error end def which(command) Array(command).find do |name| name, args = name.split(/\s+/, 2) path = locate_executable(name) next unless path args ? "#{path} #{args}" : path end end end end