gh-84461: Improve WebAssembly in-browser demo (#91879)

* Buffer standard input line-by-line

* Add non-root .editorconfig for JS & HTML indent

* Add support for clearing REPL with CTRL+L

* Support unicode in stdout and stderr

* Remove \r\n normalization

* Note that local .editorconfig file extends root

* Only normalize lone \r characters (convert to \n)

* Skip non-printable characters in buffered input

* Fix Safari bug (regex lookbehind not supported)

Co-authored-by: Christian Heimes <christian@python.org>

1 files changed, 2 insertions, 6 deletions

diff --git a/Tools/wasm/python.worker.js b/Tools/wasm/python.worker.js
index c3a8bdf..1b79460 100644
--- a/Tools/wasm/python.worker.js
+++ b/Tools/wasm/python.worker.js
@@ -35,15 +35,11 @@ class StdinBuffer {
     }
 }
 
-const stdoutBufSize = 128;
-const stdoutBuf = new Int32Array()
-let index = 0;
-
 const stdout = (charCode) => {
     if (charCode) {
         postMessage({
             type: 'stdout',
-            stdout: String.fromCharCode(charCode),
+            stdout: charCode,
         })
     } else {
         console.log(typeof charCode, charCode)
@@ -54,7 +50,7 @@ const stderr = (charCode) => {
     if (charCode) {
         postMessage({
             type: 'stderr',
-            stderr: String.fromCharCode(charCode),
+            stderr: charCode,
         })
     } else {
         console.log(typeof charCode, charCode)