diff options
Diffstat (limited to 'ext/node/polyfills/internal/readline/emitKeypressEvents.mjs')
-rw-r--r-- | ext/node/polyfills/internal/readline/emitKeypressEvents.mjs | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/ext/node/polyfills/internal/readline/emitKeypressEvents.mjs b/ext/node/polyfills/internal/readline/emitKeypressEvents.mjs new file mode 100644 index 000000000..7f68dac47 --- /dev/null +++ b/ext/node/polyfills/internal/readline/emitKeypressEvents.mjs @@ -0,0 +1,106 @@ +// Copyright 2018-2023 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 "internal:deno_node/polyfills/internal/readline/utils.mjs"; +import { kSawKeyPress } from "internal:deno_node/polyfills/internal/readline/symbols.mjs"; +import { clearTimeout, setTimeout } from "internal:deno_node/polyfills/timers.ts"; + +const { + kEscape, +} = CSI; + +import { StringDecoder } from "internal:deno_node/polyfills/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); + } +} |