/
stapled.cr
122 lines (99 loc) · 2.79 KB
/
stapled.cr
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# This class staples together two unidirectional `IO`s to form a single,
# bidirectional `IO`.
#
# Example (loopback):
# ```
# io = IO::Stapled.new(*IO.pipe)
# io.puts "linus"
# io.gets # => "linus"
# ```
#
# Most methods simply delegate to the underlying `IO`s.
class IO::Stapled < IO
# If `#sync_close?` is `true`, closing this `IO` will close the underlying `IO`s.
property? sync_close : Bool
# Returns `true` if this `IO` is closed.
#
# Underlying ÌO`s might have a different status.
getter? closed : Bool = false
# Creates a new `IO::Stapled` which reads from *reader* and writes to *writer*-
def initialize(@reader : IO, @writer : IO, @sync_close : Bool = false)
end
# Reads a single byte from `reader`.
def read_byte : UInt8?
check_open
@reader.read_byte
end
# Reads a slice from `reader`.
def read(slice : Bytes)
check_open
@reader.read(slice)
end
# Gets a string from `reader`.
def gets(delimiter : Char, limit : Int, chomp = false) : String?
check_open
@reader.gets(delimiter, limit, chomp)
end
# Peeks into *reader*.
def peek : Bytes?
check_open
@reader.peek
end
# Skips `reader`.
def skip(bytes_count : Int) : Nil
check_open
@reader.skip(bytes_count)
end
# Writes a byte to `writer`.
def write_byte(byte : UInt8) : Nil
check_open
@writer.write_byte(byte)
end
# Writes a slice to `writer`.
def write(slice : Bytes) : Nil
check_open
@writer.write(slice)
end
# `Flushes `writer`.
def flush : self
check_open
@writer.flush
self
end
# Closes this ÌO`.
#
# If `sync_close?` is `true`it will also close the underlying ÌO`s.
def close : Nil
return if @closed
@closed = true
if @sync_close
@reader.close
@writer.close
end
end
# Creates a pair of bidirectional pipe endpoints connected with each other
# and passes them to the given block.
#
# Both endpoints and the underlying ÌO`s are closed after the block
# (even if `sync_close?` is `false`).
def self.pipe(read_blocking : Bool = false, write_blocking : Bool = false)
IO.pipe(read_blocking, write_blocking) do |a_read, a_write|
IO.pipe(read_blocking, write_blocking) do |b_read, b_write|
a, b = new(a_read, b_write, true), new(b_read, a_write, true)
begin
yield a, b
ensure
a.close
b.close
end
end
end
end
# Creates a pair of bidirectional pipe endpoints connected with each other
# and returns them in a `Tuple`.
def self.pipe(read_blocking : Bool = false, write_blocking : Bool = false) : {self, self}
a_read, a_write = IO.pipe(read_blocking, write_blocking)
b_read, b_write = IO.pipe(read_blocking, write_blocking)
return new(a_read, b_write, true), new(b_read, a_write, true)
end
end