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gh-136251: Improvements to WASM demo REPL #136252

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af4aa0d
EMSCRIPTEN BUILD: export HEAPU32 from emscripten build so that python…
adqm Jul 2, 2025
394815e
WASM REPL: fix loading xterm.js (broken in 2f1cee8477)
adqm Jul 2, 2025
aab9ccc
WASM REPL: basic navigation in REPL (arrow keys, home/end, etc)
adqm Jul 2, 2025
bd52abe
WASM REPL: reset the python worker after a program exits so that we c…
adqm Jul 2, 2025
77cc952
WASM REPL: handle a few more special keys (tab, ctrl+c)
adqm Jul 2, 2025
4cfa3f1
WASM REPL: use ace editor instead of a plain textbox for code snippet
adqm Jul 2, 2025
b688663
WASM REPL: some organization, refactoring, fixes for history
adqm Jul 2, 2025
43a47dc
WASM REPL: put demo at index.html and change text of the 'Run Code' b…
adqm Jul 3, 2025
6d5f698
WASM REPL: update README.md to account for demo location moving
adqm Jul 3, 2025
16cfea2
WASM REPL: add HEAPU32 to exports in configure.ac
adqm Jul 3, 2025
faf2ba4
WASM REPL: fix for ACE setup in Chromium
adqm Jul 3, 2025
70d4a17
WASM REPL: run prettier on index.html
adqm Jul 3, 2025
ce5ebca
WASM REPL: lower-case 'code' on 'Run code' button
adqm Jul 3, 2025
66cf49d
WASM REPL: remove trailing slashes from void tags in index.html
adqm Jul 5, 2025
8fe92d6
add short news blurb
adqm Jul 5, 2025
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4 changes: 2 additions & 2 deletions Makefile.pre.in
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Original file line number Diff line number Diff line change
Expand Up @@ -1096,7 +1096,7 @@ $(DLLLIBRARY) libpython$(LDVERSION).dll.a: $(LIBRARY_OBJS)
# wasm32-emscripten browser web example

WEBEX_DIR=$(srcdir)/Tools/wasm/emscripten/web_example/
web_example/python.html: $(WEBEX_DIR)/python.html
web_example/index.html: $(WEBEX_DIR)/index.html
@mkdir -p web_example
@cp $< $@

Expand Down Expand Up @@ -1124,7 +1124,7 @@ web_example/python.mjs web_example/python.wasm: $(BUILDPYTHON)
cp python.wasm web_example/python.wasm

.PHONY: web_example
web_example: web_example/python.mjs web_example/python.worker.mjs web_example/python.html web_example/server.py $(WEB_STDLIB)
web_example: web_example/python.mjs web_example/python.worker.mjs web_example/index.html web_example/server.py $(WEB_STDLIB)

############################################################################
# Header files
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Tools-Demos/2025-07-05-15-10-42.gh-issue-136251.GRM6o8.rst
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@@ -0,0 +1 @@
Improved usability of ``Tools/wasm/emscripten/web_example``
10 changes: 5 additions & 5 deletions Tools/wasm/README.md
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Expand Up @@ -22,7 +22,7 @@ https://github.com/psf/webassembly for more information.
### Build

To cross compile to the ``wasm32-emscripten`` platform you need
[the Emscripten compiler toolchain](https://emscripten.org/),
[the Emscripten compiler toolchain](https://emscripten.org/),
a Python interpreter, and an installation of Node version 18 or newer.
Emscripten version 4.0.2 is recommended; newer versions may also work, but all
official testing is performed with that version. All commands below are relative
Expand Down Expand Up @@ -86,11 +86,11 @@ CLI you will need to write your own alternative to `node_entry.mjs`.

### The Web Example

When building for Emscripten, the web example will be built automatically. It is
in the ``web_example`` directory. To run the web example, ``cd`` into the
When building for Emscripten, the web example will be built automatically. It
is in the ``web_example`` directory. To run the web example, ``cd`` into the
``web_example`` directory, then run ``python server.py``. This will start a web
server; you can then visit ``http://localhost:8000/python.html`` in a browser to
see a simple REPL example.
server; you can then visit ``http://localhost:8000/`` in a browser to see a
simple REPL example.

The web example relies on a bug fix in Emscripten version 3.1.73 so if you build
with earlier versions of Emscripten it may not work. The web example uses
Expand Down
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