literal map (#107)

Author: DerThorsten

CMakeLists.txt

@@ -37,6 +37,7 @@ set(PREJS_FILES
     ${CMAKE_CURRENT_SOURCE_DIR}/include/pyjs/pre_js/dynload/dynload.js
     ${CMAKE_CURRENT_SOURCE_DIR}/include/pyjs/pre_js/fetch.js
     ${CMAKE_CURRENT_SOURCE_DIR}/include/pyjs/pre_js/load_pkg.js
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/pyjs/pre_js/literal_map.js
 )
 set(POSTJS_FILES
     ${CMAKE_CURRENT_SOURCE_DIR}/include/pyjs/post_js/fixes.js

build_debug2.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+set -e
+
+# dir of this script
+THIS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+PREFIX_DIR=$THIS_DIR/wasm_prefix
+EMSDK_DIR=$THIS_DIR/emsdk_install
+EMSDK_VERSION="3.1.58"
+
+if [ ! -d "$EMSDK_DIR" ]; then
+    echo "Creating emsdk dir $EMSDK_DIR"
+    $THIS_DIR/emsdk/setup_emsdk.sh $EMSDK_VERSION $EMSDK_DIR
+else
+    echo "Emsdk dir $EMSDK_DIR already exists"
+fi
+
+
+if true; then
+    rm -rf $PREFIX_DIR
+    echo "Creating wasm env at $PREFIX_DIR"
+    $MAMBA_EXE create -p $PREFIX_DIR \
+            --platform=emscripten-wasm32 \
+            -c https://repo.mamba.pm/emscripten-forge \
+            -c https://repo.mamba.pm/conda-forge \
+            --yes \
+            python pybind11 "emscripten-abi=3.1.58"\
+            bzip2 sqlite zlib libffi pytest
+fi
+   
+cd $THIS_DIR
+source $EMSDK_DIR/emsdk_env.sh
+
+
+mkdir -p build
+cd build
+
+export PREFIX=$PREFIX_DIR
+export CMAKE_PREFIX_PATH=$PREFIX
+export CMAKE_SYSTEM_PREFIX_PATH=$PREFIX
+
+emcmake cmake \
+-DCMAKE_BUILD_TYPE=Release \
+-DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON \
+-DBUILD_RUNTIME_BROWSER=ON \
+-DBUILD_RUNTIME_NODE=OFF \
+-DCMAKE_INSTALL_PREFIX=$PREFIX \
+..
+
+emmake make -j8
+emmake make install

include/pyjs/pre_js/literal_map.js

@@ -0,0 +1,60 @@
+// see literal_map_license.txt for license information
+
+const { get, getOwnPropertyDescriptor, ownKeys } = Reflect;
+
+const getPropertyDescriptor = (value) => ({
+  value,
+  enumerable: true,
+  writable: true,
+  configurable: true,
+});
+
+const _ = Symbol();
+const prototype = "prototype";
+
+const handler = {
+  deleteProperty: (map, k) => (map.has(k) ? map.delete(k) : delete map[k]),
+  get(map, k, proxy) {
+    if (k === _) return map;
+    let v = map[k];
+    if (typeof v === "function" && k !== "constructor") {
+      v = v.bind(map);
+    }
+    v ||= map.get(k);
+    return v;
+  },
+  getOwnPropertyDescriptor(map, k) {
+    if (map.has(k)) return getPropertyDescriptor(map.get(k));
+    if (k in map) return getOwnPropertyDescriptor(map, k);
+  },
+  has: (map, k) => map.has(k) || k in map,
+  ownKeys: (map) =>
+    [...map.keys(), ...ownKeys(map)].filter((x) =>
+      ["string", "symbol"].includes(typeof x),
+    ),
+  set: (map, k, v) => (map.set(k, v), true),
+};
+
+const LiteralMap = new Proxy(
+  class LiteralMap extends Map {
+    constructor(...args) {
+      return new Proxy(super(...args), handler);
+    }
+  },
+  {
+    get(Class, k, ...rest) {
+      return k !== prototype && k in Class[prototype]
+        ? (proxy, ...args) => {
+            const map = proxy[_];
+            let value = map[k];
+            if (typeof value === "function") value = value.apply(map, args);
+            // prevent leaking the internal map elsewhere
+            return value === map ? proxy : value;
+          }
+        : get(Class, k, ...rest);
+    },
+  },
+);
+
+// export default LiteralMap;
+globalThis.LiteralMap = LiteralMap;