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require "tmpdir"
require "execjs/runtime"
module ExecJS
class ExternalRuntime < Runtime
class Context < Runtime::Context
def initialize(runtime, source = "")
source = encode(source)
@runtime = runtime
@source = source
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)
begin
extract_result(@runtime.exec_runtime(tmpfile.path))
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)
status, value = output.empty? ? [] : ::JSON.parse(output, create_additions: false)
if status == "ok"
value
elsif value =~ /SyntaxError:/
raise RuntimeError, value
else
raise ProgramError, value
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(cmd)
if ExecJS.windows? && File.extname(cmd) == ""
cmd << ".exe"
end
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
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 RuntimeError, output
end
end
# Internally exposed for Context.
public :exec_runtime
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
|
