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# frozen_string_literal: true
require 'open3'
require 'sass/cli'
module Sass
class Compiler
# The stdio based {Connection} between the {Dispatcher} and the compiler.
#
# It runs the `sass --embedded` command.
class Connection
def initialize
@mutex = Mutex.new
@stdin, @stdout, @stderr, @wait_thread = Open3.popen3(*CLI::COMMAND, '--embedded', chdir: __dir__)
@stdin.binmode
# # https://dart.dev/tools/dart-devtools
# if %w[dart dartvm].include?(File.basename(CLI::COMMAND.first, '.exe')) &&
# %w[--enable-vm-service --observe].intersect?(CLI::COMMAND.map { |argument| argument.partition('=').first })
# Kernel.warn(@stdout.readline, uplevel: 0)
# Kernel.warn(@stdout.readline, uplevel: 0)
# end
@stdout.binmode
@wait_thread.name = "sass-embedded-process-waiter-#{id}"
end
def id
@wait_thread.pid
end
def listen(dispatcher)
Thread.new do
Thread.current.name = "sass-embedded-process-stdout-poller-#{id}"
loop do
length = Varint.read(@stdout)
id = Varint.read(@stdout)
proto = @stdout.read(length - Varint.length(id))
dispatcher.receive_proto(id, proto)
end
rescue IOError, Errno::EBADF, Errno::EPROTO => e
dispatcher.error(e)
@mutex.synchronize do
@stdout.close
end
end
Thread.new do
Thread.current.name = "sass-embedded-process-stderr-poller-#{id}"
loop do
Kernel.warn(@stderr.readline, uplevel: 0)
end
rescue IOError, Errno::EBADF
@mutex.synchronize do
@stderr.close
end
end
end
def close
@mutex.synchronize do
@stdin.close
@wait_thread.join
@stdout.close
@stderr.close
end
end
def closed?
@mutex.synchronize do
@stdin.closed? && !@wait_thread.alive?
end
end
def write(id, proto)
buffer = []
Varint.write(buffer, Varint.length(id) + proto.length)
Varint.write(buffer, id)
@mutex.synchronize do
@stdin.write(buffer.pack('C*'), proto)
end
end
end
private_constant :Connection
end
end
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