Class: Esbuild::StdioProtocol::PacketDecoder

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(buf, offset, size) ⇒ PacketDecoder

Returns a new instance of PacketDecoder.



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# File 'lib/esbuild/stdio_protocol.rb', line 10

def initialize(buf, offset, size)
  @buf = buf
  @offset = offset
  @end = offset + size
end

Instance Attribute Details

#offset ⇒ Object (readonly)

Returns the value of attribute offset.



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# File 'lib/esbuild/stdio_protocol.rb', line 8

def offset
  @offset
end

Instance Method Details

#decode_packet ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 16

def decode_packet
  id = read32
  is_request = (id & 1) == 0
  id >>= 1

  value = visit
  Packet.new(id, is_request, value)
end

#read32 ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 75

def read32
  read8 | (read8 << 8) | (read8 << 16) | (read8 << 24)
end

#read8 ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/esbuild/stdio_protocol.rb', line 68

def read8
  raise ArgumentError, "Reading past buffer" if @offset >= @end
  byte = @buf.getbyte(@offset)
  @offset += 1
  byte
end

#read_string ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 61

def read_string
  size = read32
  result = @buf.byteslice(@offset, size)
  @offset += size
  result
end

#visit ⇒ Object 



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# File 'lib/esbuild/stdio_protocol.rb', line 25

def visit
  kind = read8
  case kind
  when 0
    # Null
    nil
  when 1
    # Bool
    read8 == 1
  when 2
    # Integer
    read32
  when 3
    # String
    read_string.force_encoding(Encoding::UTF_8)
  when 4
    # Bytes
    read_string
  when 5
    # Array
    size = read32
    size.times.map { visit }
  when 6
    # Object
    result = {}
    size = read32
    size.times do
      key = read_string.force_encoding(Encoding::UTF_8)
      result[key] = visit
    end
    result
  else
    raise ArgumentError, "Invalid packet #{kind}"
  end
end