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require "tempfile"
module ExecJS
class ExternalRuntime
class Context
def initialize(runtime, source = "")
source = source.encode('UTF-8') if source.respond_to?(:encode)
@runtime = runtime
@source = source
end
def eval(source, options = {})
source = source.encode('UTF-8') if source.respond_to?(:encode)
if /\S/ =~ source
exec("return eval(#{MultiJson.encode("(#{source})")})")
end
end
def exec(source, options = {})
source = source.encode('UTF-8') if source.respond_to?(:encode)
compile_to_tempfile([@source, source].join("\n")) do |file|
extract_result(@runtime.send(:exec_runtime, file.path))
end
end
def call(identifier, *args)
eval "#{identifier}.apply(this, #{MultiJson.encode(args)})"
end
protected
def compile_to_tempfile(source)
tempfile = Tempfile.open(['execjs', '.js'])
tempfile.write compile(source)
tempfile.close
yield tempfile
ensure
tempfile.close!
end
def compile(source)
@runtime.send(:runner_source).dup.tap do |output|
output.sub!('#{source}') do
source
end
output.sub!('#{encoded_source}') do
encoded_source = encode_unicode_codepoints(source)
MultiJson.encode("(function(){ #{encoded_source} })()")
end
output.sub!('#{json2_source}') do
IO.read(ExecJS.root + "/support/json2.js")
end
end
end
def extract_result(output)
status, value = output.empty? ? [] : MultiJson.decode(output)
if status == "ok"
value
elsif value == "SyntaxError: Parse error"
raise RuntimeError, value
else
raise ProgramError, value
end
end
if "".respond_to?(:codepoints)
def encode_unicode_codepoints(str)
str.gsub(/[\u0080-\uffff]/) do |ch|
"\\u%04x" % ch.codepoints.to_a
end
end
else
def encode_unicode_codepoints(str)
str.gsub(/([\xC0-\xDF][\x80-\xBF]|
[\xE0-\xEF][\x80-\xBF]{2}|
[\xF0-\xF7][\x80-\xBF]{3})+/nx) do |ch|
"\\u%04x" % ch.unpack("U*")
end
end
end
end
attr_reader :name
def initialize(options)
@name = options[:name]
@command = options[:command]
@runner_path = options[:runner_path]
@test_args = options[:test_args]
@test_match = options[:test_match]
@binary = locate_binary
end
def exec(source)
context = Context.new(self)
context.exec(source)
end
def eval(source)
context = Context.new(self)
context.eval(source)
end
def compile(source)
Context.new(self, source)
end
def available?
require "multi_json"
@binary ? true : false
end
protected
def runner_source
@runner_source ||= IO.read(@runner_path)
end
def exec_runtime(filename)
output = nil
IO.popen("#{@binary} #{filename} 2>&1") { |f| output = f.read }
if $?.success?
output
else
raise RuntimeError, output
end
end
def locate_binary
if binary = which(@command)
if @test_args
output = `#{binary} #{@test_args} 2>&1`
binary if output.match(@test_match)
else
binary
end
end
end
def which(command)
Array(command).each do |name|
name, args = name.split(/\s+/, 2)
result = if ExecJS.windows?
`"#{ExecJS.root}/support/which.bat" #{name}`
else
`command -v #{name} 2>/dev/null`
end
if path = result.strip.split("\n").first
return args ? "#{path} #{args}" : path
end
end
nil
end
end
end
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