1 files changed, 146 insertions, 0 deletions
diff --git a/ports/webassembly/api.js b/ports/webassembly/api.js
new file mode 100644
index 000000000..dfe756176
--- /dev/null
+++ b/ports/webassembly/api.js
@@ -0,0 +1,146 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2023-2024 Damien P. George
+ *
+ * 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.
+ */
+
+// Options:
+// - heapsize: size in bytes of the MicroPython GC heap.
+// - url: location to load `micropython.mjs`.
+// - stdin: function to return input characters.
+// - stdout: function that takes one argument, and is passed lines of stdout
+//   output as they are produced.  By default this is handled by Emscripten
+//   and in a browser goes to console, in node goes to process.stdout.write.
+// - stderr: same behaviour as stdout but for error output.
+// - linebuffer: whether to buffer line-by-line to stdout/stderr.
+export async function loadMicroPython(options) {
+    const { heapsize, url, stdin, stdout, stderr, linebuffer } = Object.assign(
+        { heapsize: 1024 * 1024, linebuffer: true },
+        options,
+    );
+    const Module = {};
+    Module.locateFile = (path, scriptDirectory) =>
+        url || scriptDirectory + path;
+    Module._textDecoder = new TextDecoder();
+    if (stdin !== undefined) {
+        Module.stdin = stdin;
+    }
+    if (stdout !== undefined) {
+        if (linebuffer) {
+            Module._stdoutBuffer = [];
+            Module.stdout = (c) => {
+                if (c === 10) {
+                    stdout(
+                        Module._textDecoder.decode(
+                            new Uint8Array(Module._stdoutBuffer),
+                        ),
+                    );
+                    Module._stdoutBuffer = [];
+                } else {
+                    Module._stdoutBuffer.push(c);
+                }
+            };
+        } else {
+            Module.stdout = (c) => stdout(new Uint8Array([c]));
+        }
+    }
+    if (stderr !== undefined) {
+        if (linebuffer) {
+            Module._stderrBuffer = [];
+            Module.stderr = (c) => {
+                if (c === 10) {
+                    stderr(
+                        Module._textDecoder.decode(
+                            new Uint8Array(Module._stderrBuffer),
+                        ),
+                    );
+                    Module._stderrBuffer = [];
+                } else {
+                    Module._stderrBuffer.push(c);
+                }
+            };
+        } else {
+            Module.stderr = (c) => stderr(new Uint8Array([c]));
+        }
+    }
+    const moduleLoaded = new Promise((r) => {
+        Module.postRun = r;
+    });
+    _createMicroPythonModule(Module);
+    await moduleLoaded;
+    globalThis.Module = Module;
+    proxy_js_init();
+    const pyimport = (name) => {
+        const value = Module._malloc(3 * 4);
+        Module.ccall(
+            "mp_js_do_import",
+            "null",
+            ["string", "pointer"],
+            [name, value],
+        );
+        return proxy_convert_mp_to_js_obj_jsside_with_free(value);
+    };
+    Module.ccall("mp_js_init", "null", ["number"], [heapsize]);
+    Module.ccall("proxy_c_init", "null", [], []);
+    return {
+        _module: Module,
+        PyProxy: PyProxy,
+        FS: Module.FS,
+        globals: {
+            __dict__: pyimport("__main__").__dict__,
+            get(key) {
+                return this.__dict__[key];
+            },
+            set(key, value) {
+                this.__dict__[key] = value;
+            },
+            delete(key) {
+                delete this.__dict__[key];
+            },
+        },
+        registerJsModule(name, module) {
+            const value = Module._malloc(3 * 4);
+            proxy_convert_js_to_mp_obj_jsside(module, value);
+            Module.ccall(
+                "mp_js_register_js_module",
+                "null",
+                ["string", "pointer"],
+                [name, value],
+            );
+            Module._free(value);
+        },
+        pyimport: pyimport,
+        runPython(code) {
+            const value = Module._malloc(3 * 4);
+            Module.ccall(
+                "mp_js_do_exec",
+                "number",
+                ["string", "pointer"],
+                [code, value],
+            );
+            return proxy_convert_mp_to_js_obj_jsside_with_free(value);
+        },
+    };
+}
+
+globalThis.loadMicroPython = loadMicroPython;