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);
+  }
+}