Initial commit

.gitignore

@@ -0,0 +1 @@
+*.wasm

LICENSE.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 huderlem
+
+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.

README.md

@@ -0,0 +1,36 @@
+# Porygion Playground
+
+Use it online here: http://www.huderlem.com/porygion-playground/
+
+This is an online playground for [Porygion](https://github.com/huderlem/porygion), a procedural region map generator in the Gen-3 Pokémon style.
+
+![Site Image](gallery/site.png)
+
+# Getting Started with Development
+
+These instructions will get you setup and working with the Porygion Playground locally.
+
+## Building and Running Locally
+
+First, install [Go](http://golang.org).  Porygion Playground, uses Go's WebAssembly support to interface with the JavaScript on the webpage.
+
+Clone and navigate to the Porygion working directory. To build, you must specify that WebAssembly is the target.
+```
+GOARCH=wasm GOOS=js go build -o main.wasm main.go
+```
+If you're on Windows, you might be better off running them in separate commands:
+```
+set GOARCH=wasm
+set GOOS=js
+go build -o main.wasm main.go
+```
+
+This will create a `main.wasm` file which contains the Porygion logic.
+
+Next, run a local web server in the current directory. Any web server will work.  I use `goexec`:
+```
+# install goexec: go get -u github.com/shurcooL/goexec
+goexec "http.ListenAndServe(`:8080`, http.FileServer(http.Dir(`.`)))"
+```
+
+Finally, visit `http://localhost:8080/`, and you should see the page up and running. The `main.wasm` payload is automatically loaded when the page is loaded. Look in the browser's debugging console to see if there are any errors reported.

go.mod

@@ -0,0 +1,5 @@
+module github.com/huderlem/porygion-playground
+
+go 1.13
+
+require github.com/huderlem/porygion v0.0.0-20200802144530-b21bf3f0196c // indirect

go.sum

@@ -0,0 +1,18 @@
+github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
+github.com/blend/go-sdk v2.0.0+incompatible/go.mod h1:3GUb0YsHFNTJ6hsJTpzdmCUl05o8HisKjx5OAlzYKdw=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/huderlem/porygion v0.0.0-20200802144530-b21bf3f0196c h1:vKOZ0iZ6M4Qhdo7KM0fbMdFD9fEzI1PxclfdO+9eLyI=
+github.com/huderlem/porygion v0.0.0-20200802144530-b21bf3f0196c/go.mod h1:w892W/Hj6HUB3UaXcg0n7yv+2UoMA/V54wmS6GVHhiM=
+github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
+github.com/muesli/clusters v0.0.0-20180605185049-a07a36e67d36 h1:KMCH+/bbZsAbFgzCXD3aB0DRZXnwAO8NYDmfIfslo+M=
+github.com/muesli/clusters v0.0.0-20180605185049-a07a36e67d36/go.mod h1:mw5KDqUj0eLj/6DUNINLVJNoPTFkEuGMHtJsXLviLkY=
+github.com/muesli/kmeans v0.0.0-20200718051629-66f1657148c0 h1:xptegMPjfY9TDf49s3E5QFV1dZeA3acCq9IKTGirMLo=
+github.com/muesli/kmeans v0.0.0-20200718051629-66f1657148c0/go.mod h1:+s8P1Egy3DkSU5+p4yBBn9SQQP1RhzZEgLw98DNYljQ=
+github.com/ojrac/opensimplex-go v1.0.1 h1:XslvpLP6XqQSATUtsOnGBYtFPw7FQ6h6y0ihjVeOLHo=
+github.com/ojrac/opensimplex-go v1.0.1/go.mod h1:MoSgj04tZpH8U0RefZabnHV2AbLgv/2mo3hLJtWqSEs=
+github.com/wcharczuk/go-chart v2.0.2-0.20191206192251-962b9abdec2b+incompatible h1:ahpaSRefPekV3gcXot2AOgngIV8WYqzvDyFe3i7W24w=
+github.com/wcharczuk/go-chart v2.0.2-0.20191206192251-962b9abdec2b+incompatible/go.mod h1:PF5tmL4EIx/7Wf+hEkpCqYi5He4u90sw+0+6FhrryuE=
+golang.org/x/image v0.0.0-20190501045829-6d32002ffd75 h1:TbGuee8sSq15Iguxu4deQ7+Bqq/d2rsQejGcEtADAMQ=
+golang.org/x/image v0.0.0-20190501045829-6d32002ffd75/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

index.html

@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Porygion Playground</title>
+  </head>
+  <body>
+    <!--
+  Add the following polyfill for Microsoft Edge 17/18 support:
+  <script src="https://cdn.jsdelivr.net/npm/text-encoding@0.7.0/lib/encoding.min.js"></script>
+  (see https://caniuse.com/#feat=textencoder)
+  -->
+    <script src="wasm_exec.js"></script>
+
+    <h1>Porygion Playground</h1>
+    <p>
+      Use the controls below to create procedurally-generated Pokémon
+      gen-3-styled region maps.
+    </p>
+    Number of Landmarks
+    <input type="number" id="num-cities-input" value="15" min="2" />
+    <br />
+    <button id="generate-full-button">
+      Generate New Region Map
+    </button>
+    <br />
+    <button id="generate-base-button">
+      Generate New Region Map Base
+    </button>
+    <br />
+    <button id="generate-cities-button">
+      Generate New Region Map Cities
+    </button>
+    <br />
+    <button id="generate-routes-button">
+      Generate New Region Map Routes
+    </button>
+    <p id="error-text"></p>
+    <image id="region-map-image-base" />
+    <image id="region-map-image-cities" />
+    <image id="region-map-image-full" />
+    <script>
+      let regionMap = {};
+      window.onload = function () {
+        if (!WebAssembly.instantiateStreaming) {
+          // polyfill
+          WebAssembly.instantiateStreaming = async (resp, importObject) => {
+            const source = await (await resp).arrayBuffer();
+            return await WebAssembly.instantiate(source, importObject);
+          };
+        }
+
+        const go = new Go();
+        let mod, inst;
+        WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject)
+          .then((result) => {
+            mod = result.module;
+            inst = result.instance;
+            go.run(inst);
+          })
+          .catch((err) => {
+            console.error(err);
+          });
+      };
+
+      function displayImage(buf, id) {
+        let blob = new Blob([buf], { type: "image/png" });
+        document.getElementById(id).src = URL.createObjectURL(blob);
+      }
+    </script>
+  </body>
+</html>

main.go

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+package main
+
+import (
+	"bytes"
+	"image/png"
+	_ "image/png"
+	"strconv"
+	"syscall/js"
+	"time"
+
+	"github.com/huderlem/porygion"
+)
+
+type context struct {
+	regionMap porygion.RegionMap
+}
+
+func (c *context) renderBaseMap() error {
+	imgBase := porygion.RenderBaseRegionMap(c.regionMap)
+	buf := new(bytes.Buffer)
+	err := png.Encode(buf, imgBase)
+	if err != nil {
+		return err
+	}
+	dst := js.Global().Get("Uint8Array").New(len(buf.Bytes()))
+	js.CopyBytesToJS(dst, buf.Bytes())
+	js.Global().Call("displayImage", dst, "region-map-image-base")
+	return nil
+}
+
+func (c *context) renderCitiesMap() error {
+	imgBase := porygion.RenderRegionMapWithCities(c.regionMap)
+	buf := new(bytes.Buffer)
+	err := png.Encode(buf, imgBase)
+	if err != nil {
+		return err
+	}
+	dst := js.Global().Get("Uint8Array").New(len(buf.Bytes()))
+	js.CopyBytesToJS(dst, buf.Bytes())
+	js.Global().Call("displayImage", dst, "region-map-image-cities")
+	return nil
+}
+
+func (c *context) renderFullMap() error {
+	imgBase := porygion.RenderFullRegionMap(c.regionMap)
+	buf := new(bytes.Buffer)
+	err := png.Encode(buf, imgBase)
+	if err != nil {
+		return err
+	}
+	dst := js.Global().Get("Uint8Array").New(len(buf.Bytes()))
+	js.CopyBytesToJS(dst, buf.Bytes())
+	js.Global().Call("displayImage", dst, "region-map-image-full")
+	return nil
+}
+
+func (c *context) generateBase() interface{} {
+	seed := time.Now().UnixNano()
+	regionMap := porygion.GenerateBaseRegionMap(seed, 240, 160)
+	c.regionMap = regionMap
+	c.renderBaseMap()
+	return nil
+}
+
+func (c *context) generateCities() interface{} {
+	if len(c.regionMap.Elevations) == 0 {
+		return nil
+	}
+	numCities, _ := strconv.Atoi(js.Global().Get("document").
+		Call("getElementById", "num-cities-input").
+		Get("value").String())
+	seed := time.Now().UnixNano()
+	regionMap := porygion.GenerateRegionMapWithCities(seed, numCities, c.regionMap)
+	c.regionMap = regionMap
+	c.renderBaseMap()
+	c.renderCitiesMap()
+	return regionMap
+}
+
+func (c *context) generateRoutes() interface{} {
+	if len(c.regionMap.Elevations) == 0 {
+		return nil
+	}
+	seed := time.Now().UnixNano()
+	regionMap, err := porygion.GenerateRegionMapWithRoutes(seed, c.regionMap)
+	if err != nil {
+		return porygion.RegionMap{}
+	}
+	c.regionMap = regionMap
+	c.renderBaseMap()
+	c.renderCitiesMap()
+	c.renderFullMap()
+
+	return regionMap
+}
+
+func (c *context) generateFull() interface{} {
+	seed := time.Now().UnixNano()
+	numCities, _ := strconv.Atoi(js.Global().Get("document").
+		Call("getElementById", "num-cities-input").
+		Get("value").String())
+	regionMap, err := porygion.GenerateRegionMap(seed, 240, 160, numCities)
+	if err != nil {
+		return porygion.RegionMap{}
+	}
+	c.regionMap = regionMap
+	c.renderBaseMap()
+	c.renderCitiesMap()
+	c.renderFullMap()
+
+	return regionMap
+}
+
+func (c *context) registerFunctions() {
+	js.Global().Get("document").
+		Call("getElementById", "generate-full-button").
+		Call("addEventListener", "click", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+			c.generateFull()
+			return nil
+		}))
+	js.Global().Get("document").
+		Call("getElementById", "generate-base-button").
+		Call("addEventListener", "click", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+			c.generateBase()
+			return nil
+		}))
+	js.Global().Get("document").
+		Call("getElementById", "generate-cities-button").
+		Call("addEventListener", "click", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+			c.generateCities()
+			return nil
+		}))
+	js.Global().Get("document").
+		Call("getElementById", "generate-routes-button").
+		Call("addEventListener", "click", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
+			c.generateRoutes()
+			return nil
+		}))
+}
+
+func main() {
+	c := make(chan struct{}, 0)
+	ctx := context{}
+	ctx.registerFunctions()
+	<-c
+}

wasm_exec.js

@@ -0,0 +1,533 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+(() => {
+	// Map multiple JavaScript environments to a single common API,
+	// preferring web standards over Node.js API.
+	//
+	// Environments considered:
+	// - Browsers
+	// - Node.js
+	// - Electron
+	// - Parcel
+
+	if (typeof global !== "undefined") {
+		// global already exists
+	} else if (typeof window !== "undefined") {
+		window.global = window;
+	} else if (typeof self !== "undefined") {
+		self.global = self;
+	} else {
+		throw new Error("cannot export Go (neither global, window nor self is defined)");
+	}
+
+	if (!global.require && typeof require !== "undefined") {
+		global.require = require;
+	}
+
+	if (!global.fs && global.require) {
+		global.fs = require("fs");
+	}
+
+	if (!global.fs) {
+		let outputBuf = "";
+		global.fs = {
+			constants: { O_WRONLY: -1, O_RDWR: -1, O_CREAT: -1, O_TRUNC: -1, O_APPEND: -1, O_EXCL: -1 }, // unused
+			writeSync(fd, buf) {
+				outputBuf += decoder.decode(buf);
+				const nl = outputBuf.lastIndexOf("\n");
+				if (nl != -1) {
+					console.log(outputBuf.substr(0, nl));
+					outputBuf = outputBuf.substr(nl + 1);
+				}
+				return buf.length;
+			},
+			write(fd, buf, offset, length, position, callback) {
+				if (offset !== 0 || length !== buf.length || position !== null) {
+					throw new Error("not implemented");
+				}
+				const n = this.writeSync(fd, buf);
+				callback(null, n);
+			},
+			open(path, flags, mode, callback) {
+				const err = new Error("not implemented");
+				err.code = "ENOSYS";
+				callback(err);
+			},
+			read(fd, buffer, offset, length, position, callback) {
+				const err = new Error("not implemented");
+				err.code = "ENOSYS";
+				callback(err);
+			},
+			fsync(fd, callback) {
+				callback(null);
+			},
+		};
+	}
+
+	if (!global.crypto) {
+		const nodeCrypto = require("crypto");
+		global.crypto = {
+			getRandomValues(b) {
+				nodeCrypto.randomFillSync(b);
+			},
+		};
+	}
+
+	if (!global.performance) {
+		global.performance = {
+			now() {
+				const [sec, nsec] = process.hrtime();
+				return sec * 1000 + nsec / 1000000;
+			},
+		};
+	}
+
+	if (!global.TextEncoder) {
+		global.TextEncoder = require("util").TextEncoder;
+	}
+
+	if (!global.TextDecoder) {
+		global.TextDecoder = require("util").TextDecoder;
+	}
+
+	// End of polyfills for common API.
+
+	const encoder = new TextEncoder("utf-8");
+	const decoder = new TextDecoder("utf-8");
+
+	global.Go = class {
+		constructor() {
+			this.argv = ["js"];
+			this.env = {};
+			this.exit = (code) => {
+				if (code !== 0) {
+					console.warn("exit code:", code);
+				}
+			};
+			this._exitPromise = new Promise((resolve) => {
+				this._resolveExitPromise = resolve;
+			});
+			this._pendingEvent = null;
+			this._scheduledTimeouts = new Map();
+			this._nextCallbackTimeoutID = 1;
+
+			const mem = () => {
+				// The buffer may change when requesting more memory.
+				return new DataView(this._inst.exports.mem.buffer);
+			}
+
+			const setInt64 = (addr, v) => {
+				mem().setUint32(addr + 0, v, true);
+				mem().setUint32(addr + 4, Math.floor(v / 4294967296), true);
+			}
+
+			const getInt64 = (addr) => {
+				const low = mem().getUint32(addr + 0, true);
+				const high = mem().getInt32(addr + 4, true);
+				return low + high * 4294967296;
+			}
+
+			const loadValue = (addr) => {
+				const f = mem().getFloat64(addr, true);
+				if (f === 0) {
+					return undefined;
+				}
+				if (!isNaN(f)) {
+					return f;
+				}
+
+				const id = mem().getUint32(addr, true);
+				return this._values[id];
+			}
+
+			const storeValue = (addr, v) => {
+				const nanHead = 0x7FF80000;
+
+				if (typeof v === "number") {
+					if (isNaN(v)) {
+						mem().setUint32(addr + 4, nanHead, true);
+						mem().setUint32(addr, 0, true);
+						return;
+					}
+					if (v === 0) {
+						mem().setUint32(addr + 4, nanHead, true);
+						mem().setUint32(addr, 1, true);
+						return;
+					}
+					mem().setFloat64(addr, v, true);
+					return;
+				}
+
+				switch (v) {
+					case undefined:
+						mem().setFloat64(addr, 0, true);
+						return;
+					case null:
+						mem().setUint32(addr + 4, nanHead, true);
+						mem().setUint32(addr, 2, true);
+						return;
+					case true:
+						mem().setUint32(addr + 4, nanHead, true);
+						mem().setUint32(addr, 3, true);
+						return;
+					case false:
+						mem().setUint32(addr + 4, nanHead, true);
+						mem().setUint32(addr, 4, true);
+						return;
+				}
+
+				let ref = this._refs.get(v);
+				if (ref === undefined) {
+					ref = this._values.length;
+					this._values.push(v);
+					this._refs.set(v, ref);
+				}
+				let typeFlag = 0;
+				switch (typeof v) {
+					case "string":
+						typeFlag = 1;
+						break;
+					case "symbol":
+						typeFlag = 2;
+						break;
+					case "function":
+						typeFlag = 3;
+						break;
+				}
+				mem().setUint32(addr + 4, nanHead | typeFlag, true);
+				mem().setUint32(addr, ref, true);
+			}
+
+			const loadSlice = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return new Uint8Array(this._inst.exports.mem.buffer, array, len);
+			}
+
+			const loadSliceOfValues = (addr) => {
+				const array = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				const a = new Array(len);
+				for (let i = 0; i < len; i++) {
+					a[i] = loadValue(array + i * 8);
+				}
+				return a;
+			}
+
+			const loadString = (addr) => {
+				const saddr = getInt64(addr + 0);
+				const len = getInt64(addr + 8);
+				return decoder.decode(new DataView(this._inst.exports.mem.buffer, saddr, len));
+			}
+
+			const timeOrigin = Date.now() - performance.now();
+			this.importObject = {
+				go: {
+					// Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
+					// may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
+					// function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
+					// This changes the SP, thus we have to update the SP used by the imported function.
+
+					// func wasmExit(code int32)
+					"runtime.wasmExit": (sp) => {
+						const code = mem().getInt32(sp + 8, true);
+						this.exited = true;
+						delete this._inst;
+						delete this._values;
+						delete this._refs;
+						this.exit(code);
+					},
+
+					// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
+					"runtime.wasmWrite": (sp) => {
+						const fd = getInt64(sp + 8);
+						const p = getInt64(sp + 16);
+						const n = mem().getInt32(sp + 24, true);
+						fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n));
+					},
+
+					// func nanotime() int64
+					"runtime.nanotime": (sp) => {
+						setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000);
+					},
+
+					// func walltime() (sec int64, nsec int32)
+					"runtime.walltime": (sp) => {
+						const msec = (new Date).getTime();
+						setInt64(sp + 8, msec / 1000);
+						mem().setInt32(sp + 16, (msec % 1000) * 1000000, true);
+					},
+
+					// func scheduleTimeoutEvent(delay int64) int32
+					"runtime.scheduleTimeoutEvent": (sp) => {
+						const id = this._nextCallbackTimeoutID;
+						this._nextCallbackTimeoutID++;
+						this._scheduledTimeouts.set(id, setTimeout(
+							() => {
+								this._resume();
+								while (this._scheduledTimeouts.has(id)) {
+									// for some reason Go failed to register the timeout event, log and try again
+									// (temporary workaround for https://github.com/golang/go/issues/28975)
+									console.warn("scheduleTimeoutEvent: missed timeout event");
+									this._resume();
+								}
+							},
+							getInt64(sp + 8) + 1, // setTimeout has been seen to fire up to 1 millisecond early
+						));
+						mem().setInt32(sp + 16, id, true);
+					},
+
+					// func clearTimeoutEvent(id int32)
+					"runtime.clearTimeoutEvent": (sp) => {
+						const id = mem().getInt32(sp + 8, true);
+						clearTimeout(this._scheduledTimeouts.get(id));
+						this._scheduledTimeouts.delete(id);
+					},
+
+					// func getRandomData(r []byte)
+					"runtime.getRandomData": (sp) => {
+						crypto.getRandomValues(loadSlice(sp + 8));
+					},
+
+					// func stringVal(value string) ref
+					"syscall/js.stringVal": (sp) => {
+						storeValue(sp + 24, loadString(sp + 8));
+					},
+
+					// func valueGet(v ref, p string) ref
+					"syscall/js.valueGet": (sp) => {
+						const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16));
+						sp = this._inst.exports.getsp(); // see comment above
+						storeValue(sp + 32, result);
+					},
+
+					// func valueSet(v ref, p string, x ref)
+					"syscall/js.valueSet": (sp) => {
+						Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32));
+					},
+
+					// func valueIndex(v ref, i int) ref
+					"syscall/js.valueIndex": (sp) => {
+						storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16)));
+					},
+
+					// valueSetIndex(v ref, i int, x ref)
+					"syscall/js.valueSetIndex": (sp) => {
+						Reflect.set(loadValue(sp + 8), getInt64(sp + 16), loadValue(sp + 24));
+					},
+
+					// func valueCall(v ref, m string, args []ref) (ref, bool)
+					"syscall/js.valueCall": (sp) => {
+						try {
+							const v = loadValue(sp + 8);
+							const m = Reflect.get(v, loadString(sp + 16));
+							const args = loadSliceOfValues(sp + 32);
+							const result = Reflect.apply(m, v, args);
+							sp = this._inst.exports.getsp(); // see comment above
+							storeValue(sp + 56, result);
+							mem().setUint8(sp + 64, 1);
+						} catch (err) {
+							storeValue(sp + 56, err);
+							mem().setUint8(sp + 64, 0);
+						}
+					},
+
+					// func valueInvoke(v ref, args []ref) (ref, bool)
+					"syscall/js.valueInvoke": (sp) => {
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.apply(v, undefined, args);
+							sp = this._inst.exports.getsp(); // see comment above
+							storeValue(sp + 40, result);
+							mem().setUint8(sp + 48, 1);
+						} catch (err) {
+							storeValue(sp + 40, err);
+							mem().setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueNew(v ref, args []ref) (ref, bool)
+					"syscall/js.valueNew": (sp) => {
+						try {
+							const v = loadValue(sp + 8);
+							const args = loadSliceOfValues(sp + 16);
+							const result = Reflect.construct(v, args);
+							sp = this._inst.exports.getsp(); // see comment above
+							storeValue(sp + 40, result);
+							mem().setUint8(sp + 48, 1);
+						} catch (err) {
+							storeValue(sp + 40, err);
+							mem().setUint8(sp + 48, 0);
+						}
+					},
+
+					// func valueLength(v ref) int
+					"syscall/js.valueLength": (sp) => {
+						setInt64(sp + 16, parseInt(loadValue(sp + 8).length));
+					},
+
+					// valuePrepareString(v ref) (ref, int)
+					"syscall/js.valuePrepareString": (sp) => {
+						const str = encoder.encode(String(loadValue(sp + 8)));
+						storeValue(sp + 16, str);
+						setInt64(sp + 24, str.length);
+					},
+
+					// valueLoadString(v ref, b []byte)
+					"syscall/js.valueLoadString": (sp) => {
+						const str = loadValue(sp + 8);
+						loadSlice(sp + 16).set(str);
+					},
+
+					// func valueInstanceOf(v ref, t ref) bool
+					"syscall/js.valueInstanceOf": (sp) => {
+						mem().setUint8(sp + 24, loadValue(sp + 8) instanceof loadValue(sp + 16));
+					},
+
+					// func copyBytesToGo(dst []byte, src ref) (int, bool)
+					"syscall/js.copyBytesToGo": (sp) => {
+						const dst = loadSlice(sp + 8);
+						const src = loadValue(sp + 32);
+						if (!(src instanceof Uint8Array)) {
+							mem().setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						mem().setUint8(sp + 48, 1);
+					},
+
+					// func copyBytesToJS(dst ref, src []byte) (int, bool)
+					"syscall/js.copyBytesToJS": (sp) => {
+						const dst = loadValue(sp + 8);
+						const src = loadSlice(sp + 16);
+						if (!(dst instanceof Uint8Array)) {
+							mem().setUint8(sp + 48, 0);
+							return;
+						}
+						const toCopy = src.subarray(0, dst.length);
+						dst.set(toCopy);
+						setInt64(sp + 40, toCopy.length);
+						mem().setUint8(sp + 48, 1);
+					},
+
+					"debug": (value) => {
+						console.log(value);
+					},
+				}
+			};
+		}
+
+		async run(instance) {
+			this._inst = instance;
+			this._values = [ // TODO: garbage collection
+				NaN,
+				0,
+				null,
+				true,
+				false,
+				global,
+				this,
+			];
+			this._refs = new Map();
+			this.exited = false;
+
+			const mem = new DataView(this._inst.exports.mem.buffer)
+
+			// Pass command line arguments and environment variables to WebAssembly by writing them to the linear memory.
+			let offset = 4096;
+
+			const strPtr = (str) => {
+				const ptr = offset;
+				const bytes = encoder.encode(str + "\0");
+				new Uint8Array(mem.buffer, offset, bytes.length).set(bytes);
+				offset += bytes.length;
+				if (offset % 8 !== 0) {
+					offset += 8 - (offset % 8);
+				}
+				return ptr;
+			};
+
+			const argc = this.argv.length;
+
+			const argvPtrs = [];
+			this.argv.forEach((arg) => {
+				argvPtrs.push(strPtr(arg));
+			});
+
+			const keys = Object.keys(this.env).sort();
+			argvPtrs.push(keys.length);
+			keys.forEach((key) => {
+				argvPtrs.push(strPtr(`${key}=${this.env[key]}`));
+			});
+
+			const argv = offset;
+			argvPtrs.forEach((ptr) => {
+				mem.setUint32(offset, ptr, true);
+				mem.setUint32(offset + 4, 0, true);
+				offset += 8;
+			});
+
+			this._inst.exports.run(argc, argv);
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+			await this._exitPromise;
+		}
+
+		_resume() {
+			if (this.exited) {
+				throw new Error("Go program has already exited");
+			}
+			this._inst.exports.resume();
+			if (this.exited) {
+				this._resolveExitPromise();
+			}
+		}
+
+		_makeFuncWrapper(id) {
+			const go = this;
+			return function () {
+				const event = { id: id, this: this, args: arguments };
+				go._pendingEvent = event;
+				go._resume();
+				return event.result;
+			};
+		}
+	}
+
+	if (
+		global.require &&
+		global.require.main === module &&
+		global.process &&
+		global.process.versions &&
+		!global.process.versions.electron
+	) {
+		if (process.argv.length < 3) {
+			console.error("usage: go_js_wasm_exec [wasm binary] [arguments]");
+			process.exit(1);
+		}
+
+		const go = new Go();
+		go.argv = process.argv.slice(2);
+		go.env = Object.assign({ TMPDIR: require("os").tmpdir() }, process.env);
+		go.exit = process.exit;
+		WebAssembly.instantiate(fs.readFileSync(process.argv[2]), go.importObject).then((result) => {
+			process.on("exit", (code) => { // Node.js exits if no event handler is pending
+				if (code === 0 && !go.exited) {
+					// deadlock, make Go print error and stack traces
+					go._pendingEvent = { id: 0 };
+					go._resume();
+				}
+			});
+			return go.run(result.instance);
+		}).catch((err) => {
+			console.error(err);
+			process.exit(1);
+		});
+	}
+})();