class TermBuf::ResponseScanner

• TermBuf::ResponseScanner
• Reference
• Object

Overview

Splits a stream of bytes arriving from the terminal into complete escape sequences and everything else.

The prober needs this to tell a reply to its own query from a keystroke that happened to arrive at the same moment, and the input decoder needs the same split for the same reason. Bytes that do not form a complete sequence yet are held back rather than guessed at.

Defined in:

termbuf/caps/response_scanner.cr

Constant Summary

BEL = 7_u8

ESC = 27_u8

MAX_SEQUENCE = 1024

A sequence longer than this is treated as a stray escape followed by ordinary input. Without a bound, one ESC with nothing after it would hold every later byte hostage.

Constructors

• .new

Instance Method Summary

• #clear : Nil

  Discards anything held back.

• #feed(chunk : Bytes, & : Kind, Bytes -> ) : Nil

  Feeds bytes in, yielding each complete chunk that can be classified.

• #flush(& : Kind, Bytes -> ) : Nil

  Treats whatever is held back as ordinary text, which is what a timeout means: no more of that sequence is coming.

• #pending : Bytes

  Bytes held back because they do not yet form a complete sequence.

• #pending? : Bool

  Whether anything is being held back, without copying it out.

Constructor Detail

Instance Method Detail