Class: Esbuild::StdioProtocol::PacketEncoder

Inherits:
Object
  • Object
show all
Defined in:
lib/esbuild/stdio_protocol.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PacketEncoder

Returns a new instance of PacketEncoder.



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# File 'lib/esbuild/stdio_protocol.rb', line 81

def initialize
  @format = ""
  @elements = []
  @size = 0
end

Instance Method Details

#encode_packet(packet) ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 87

def encode_packet(packet)
  write32 0
  write32((packet.id << 1) | (packet.is_request ? 0 : 1))
  visit(packet.value)
  @elements[0] = @size - 4
  @elements.pack(@format)
end

#visit(value) ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 95

def visit(value)
  case value
  when nil
    write8 0
  when true, false
    write8 1
    write8(value ? 1 : 0)
  when Integer
    write8 2
    write32 value
  when String
    if value.encoding == Encoding::BINARY
      write8 4
    else
      write8 3
      value = value.encode(Encoding::UTF_8) unless value.encoding == Encoding::UTF_8
    end
    write_string value
  when Array
    write8 5
    write32 value.size
    value.each { |item| visit(item) }
  when Hash
    write8 6
    write32 value.size
    value.each do |key, val|
      write_string key
      visit val
    end
  else
    raise ArgumentError, "Don't know how to encode #{value.inspect}"
  end
end

#write32(value) ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 137

def write32(value)
  @elements << value
  @format << "L<"
  @size += 4
end

#write8(value) ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 143

def write8(value)
  @elements << value
  @format << "C"
  @size += 1
end

#write_string(string) ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 129

def write_string(string)
  string = string.to_s
  write32 string.bytesize
  @elements << string
  @format << "a*"
  @size += string.bytesize
end