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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright Joyent, Inc. and other Node contributors.//// Permission is hereby granted, free of charge, to any person obtaining a// copy of this software and associated documentation files (the// "Software"), to deal in the Software without restriction, including// without limitation the rights to use, copy, modify, merge, publish,// distribute, sublicense, and/or sell copies of the Software, and to permit// persons to whom the Software is furnished to do so, subject to the// following conditions://// The above copyright notice and this permission notice shall be included// in all copies or substantial portions of the Software.//// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE// USE OR OTHER DEALINGS IN THE SOFTWARE.
import { charLengthAt, CSI, emitKeys } from "./utils.mjs";import { kSawKeyPress } from "./symbols.mjs";import { clearTimeout, setTimeout } from "../../timers.ts";
const {  kEscape,} = CSI;
import { StringDecoder } from "../../string_decoder.ts";
const KEYPRESS_DECODER = Symbol("keypress-decoder");const ESCAPE_DECODER = Symbol("escape-decoder");
// GNU readline library - keyseq-timeout is 500ms (default)const ESCAPE_CODE_TIMEOUT = 500;
/** * accepts a readable Stream instance and makes it emit "keypress" events */
export function emitKeypressEvents(stream, iface = {}) {  if (stream[KEYPRESS_DECODER]) return;
  stream[KEYPRESS_DECODER] = new StringDecoder("utf8");
  stream[ESCAPE_DECODER] = emitKeys(stream);  stream[ESCAPE_DECODER].next();
  const triggerEscape = () => stream[ESCAPE_DECODER].next("");  const { escapeCodeTimeout = ESCAPE_CODE_TIMEOUT } = iface;  let timeoutId;
  function onData(input) {    if (stream.listenerCount("keypress") > 0) {      const string = stream[KEYPRESS_DECODER].write(input);      if (string) {        clearTimeout(timeoutId);
        // This supports characters of length 2.        iface[kSawKeyPress] = charLengthAt(string, 0) === string.length;        iface.isCompletionEnabled = false;
        let length = 0;        for (const character of string[Symbol.iterator]()) {          length += character.length;          if (length === string.length) {            iface.isCompletionEnabled = true;          }
          try {            stream[ESCAPE_DECODER].next(character);            // Escape letter at the tail position            if (length === string.length && character === kEscape) {              timeoutId = setTimeout(triggerEscape, escapeCodeTimeout);            }          } catch (err) {            // If the generator throws (it could happen in the `keypress`            // event), we need to restart it.            stream[ESCAPE_DECODER] = emitKeys(stream);            stream[ESCAPE_DECODER].next();            throw err;          }        }      }    } else {      // Nobody's watching anyway      stream.removeListener("data", onData);      stream.on("newListener", onNewListener);    }  }
  function onNewListener(event) {    if (event === "keypress") {      stream.on("data", onData);      stream.removeListener("newListener", onNewListener);    }  }
  if (stream.listenerCount("keypress") > 0) {    stream.on("data", onData);  } else {    stream.on("newListener", onNewListener);  }}