diff --git a/README.md b/README.md index 503bd00..ab67548 100644 --- a/README.md +++ b/README.md @@ -9,30 +9,6 @@ import "github.com/euforic/templit" ``` -## Index - -- [Variables](<#variables>) -- [func ToCamelCase(s string) string](<#ToCamelCase>) -- [func ToKebabCase(s string) string](<#ToKebabCase>) -- [func ToPascalCase(s string) string](<#ToPascalCase>) -- [func ToSnakeCase(s string) string](<#ToSnakeCase>) -- [type DefaultGitClient](<#DefaultGitClient>) - - [func NewDefaultGitClient(token string) *DefaultGitClient](<#NewDefaultGitClient>) - - [func (d *DefaultGitClient) Checkout(path, branch string) error](<#DefaultGitClient.Checkout>) - - [func (d *DefaultGitClient) Clone(host, owner, repo, dest string) error](<#DefaultGitClient.Clone>) -- [type DepInfo](<#DepInfo>) - - [func ParseDepURL(rawURL string) (*DepInfo, error)](<#ParseDepURL>) -- [type Executor](<#Executor>) - - [func NewExecutor() *Executor](<#NewExecutor>) - - [func (e *Executor) EmbedFunc(client GitClient) func(remotePath string, data interface{}) (string, error)](<#Executor.EmbedFunc>) - - [func (e *Executor) ImportFunc(client GitClient) func(repoAndTag, destPath string, data interface{}) (string, error)](<#Executor.ImportFunc>) - - [func (e *Executor) ParsePath(inputPath string) error](<#Executor.ParsePath>) - - [func (e Executor) Render(name string, data interface{}) (string, error)](<#Executor.Render>) - - [func (e Executor) StringRender(templateString string, data interface{}) (string, error)](<#Executor.StringRender>) - - [func (e *Executor) WalkAndProcessDir(inputDir, outputDir string, data interface{}) error](<#Executor.WalkAndProcessDir>) -- [type GitClient](<#GitClient>) - - ## Variables DefaultFuncMap is the default function map for templates. @@ -177,6 +153,7 @@ Executor is a wrapper around the template.Template type ```go type Executor struct { *template.Template + git GitClient } ``` @@ -219,7 +196,7 @@ Placeholders: ### func (*Executor) ImportFunc ```go -func (e *Executor) ImportFunc() func(repoAndTag, destPath string, data interface{}) (string, error) +func (e *Executor) ImportFunc(destPath string) func(repoAndTag, path string, data interface{}) (string, error) ``` ImportFunc returns a function that can be used as a template function to import and process a template from a remote git repository. ImportFunc allows embedding content from a remote repository into a Go template. diff --git a/docs/go.mod b/docs/go.mod new file mode 100644 index 0000000..d784009 --- /dev/null +++ b/docs/go.mod @@ -0,0 +1,5 @@ +module github.com/euforic/exp + +go 1.21.1 + +require github.com/davecgh/go-spew v1.1.1 diff --git a/docs/go.sum b/docs/go.sum new file mode 100644 index 0000000..b5e2922 --- /dev/null +++ b/docs/go.sum @@ -0,0 +1,2 @@ +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= diff --git a/docs/index.html b/docs/index.html new file mode 100644 index 0000000..896eed2 --- /dev/null +++ b/docs/index.html @@ -0,0 +1,64 @@ + + + + + + + Go Template Renderer + + + + + + + + + + + +
+
+
+

Go Template

+
+
+
+

JSON Data

+
+
+
+ + +
+ +
+ +
+
+

Output

+
+
+
+
+ + + + + + diff --git a/docs/main.go b/docs/main.go new file mode 100644 index 0000000..bf6d4c8 --- /dev/null +++ b/docs/main.go @@ -0,0 +1,155 @@ +//go:build js && wasm +// +build js,wasm + +//go:generate cp $GOROOT/misc/wasm/wasm_exec.js . +package main + +import ( + "bytes" + "encoding/json" + "fmt" + "syscall/js" + "text/template" +) + +type App struct { + templateEditor js.Value + jsonEditor js.Value + outputEditor js.Value +} + +func main() { + app := &App{} + app.init() + + // Block forever to keep the Go program running + select {} +} + +func (app *App) init() { + app.initExports() + app.initCodeMirror() + app.initVimToggle() + app.initRender() +} + +func (app *App) initExports() { + js.Global().Set("renderTemplate", js.FuncOf(app.renderTemplate)) +} + +func (app *App) initCodeMirror() { + cm := js.Global().Get("CodeMirror") + app.templateEditor = cm.New(js.Global().Get("document").Call("getElementById", "template"), js.ValueOf(map[string]interface{}{ + "mode": "go", + "theme": "material-darker", + "lineNumbers": true, + "value": "Hello, {{.Name}}", + })) + + app.jsonEditor = cm.New(js.Global().Get("document").Call("getElementById", "json"), js.ValueOf(map[string]interface{}{ + "mode": "javascript", + "theme": "material-darker", + "lineNumbers": true, + "value": `{ + "Name": "World" +}`, + })) + + app.outputEditor = cm.New(js.Global().Get("document").Call("getElementById", "output"), js.ValueOf(map[string]interface{}{ + "lineNumbers": true, + "readOnly": true, + "theme": "material-darker", + "value": "Hello, World", + })) +} + +func (app *App) initVimToggle() { + vimToggle := js.Global().Get("document").Call("getElementById", "vim-toggle") + isVimEnabled := js.Global().Get("localStorage").Call("getItem", "vimEnabled").String() == "true" + app.setKeyMap(isVimEnabled) + vimToggle.Set("checked", isVimEnabled) + vimToggle.Call("addEventListener", "change", js.FuncOf(func(this js.Value, args []js.Value) interface{} { + app.setKeyMap(vimToggle.Get("checked").Bool()) + js.Global().Get("localStorage").Call("setItem", "vimEnabled", vimToggle.Get("checked").Bool()) + return nil + })) +} + +func (app *App) setKeyMap(vimEnabled bool) { + keyMap := "default" + if vimEnabled { + keyMap = "vim" + } + app.templateEditor.Call("setOption", "keyMap", keyMap) + app.jsonEditor.Call("setOption", "keyMap", keyMap) + app.outputEditor.Call("setOption", "keyMap", keyMap) +} + +func (app *App) initRender() { + saveFunc := js.FuncOf(func(this js.Value, args []js.Value) interface{} { + app.saveCurrentData() + return nil + }) + renderFunc := js.FuncOf(func(this js.Value, args []js.Value) interface{} { + go app.render() + return nil + }) + app.templateEditor.Call("on", "change", saveFunc) + app.jsonEditor.Call("on", "change", saveFunc) + app.templateEditor.Call("on", "change", renderFunc) + app.jsonEditor.Call("on", "change", renderFunc) + app.loadPersistedData() +} + +func (app *App) render() { + template := app.templateEditor.Call("getValue").String() + json := app.jsonEditor.Call("getValue").String() + result := app.renderTemplate(js.Null(), []js.Value{js.ValueOf(template), js.ValueOf(json)}).(string) + app.outputEditor.Call("setValue", result) +} + +func (app *App) renderTemplate(this js.Value, args []js.Value) interface{} { + tmplStr := args[0].String() + jsonStr := args[1].String() + + tmpl, err := template.New("tmpl").Parse(tmplStr) + if err != nil { + return fmt.Sprintf("Template error: %v", err) + } + + var data interface{} + err = json.Unmarshal([]byte(jsonStr), &data) + if err != nil { + return fmt.Sprintf("JSON error: %v", err) + } + + var buf bytes.Buffer + err = tmpl.Execute(&buf, data) + if err != nil { + return fmt.Sprintf("Execution error: %v", err) + } + + return buf.String() +} + +func (app *App) saveCurrentData() { + js.Global().Get("localStorage").Call("setItem", "templateData", app.templateEditor.Call("getValue").String()) + js.Global().Get("localStorage").Call("setItem", "jsonData", app.jsonEditor.Call("getValue").String()) +} + +func (app *App) loadPersistedData() { + persistedTemplateData := js.Global().Get("localStorage").Call("getItem", "templateData").String() + persistedJsonData := js.Global().Get("localStorage").Call("getItem", "jsonData").String() + + if persistedTemplateData != "" { + app.templateEditor.Call("setValue", persistedTemplateData) + } + + if persistedJsonData != "" { + app.jsonEditor.Call("setValue", persistedJsonData) + } + + if persistedTemplateData != "" || persistedJsonData != "" { + app.render() + } +} diff --git a/docs/main.wasm b/docs/main.wasm new file mode 100755 index 0000000..fa64264 Binary files /dev/null and b/docs/main.wasm differ diff --git a/docs/wasm_exec.js b/docs/wasm_exec.js new file mode 100644 index 0000000..bc6f210 --- /dev/null +++ b/docs/wasm_exec.js @@ -0,0 +1,561 @@ +// 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. + +"use strict"; + +(() => { + const enosys = () => { + const err = new Error("not implemented"); + err.code = "ENOSYS"; + return err; + }; + + if (!globalThis.fs) { + let outputBuf = ""; + globalThis.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.substring(0, nl)); + outputBuf = outputBuf.substring(nl + 1); + } + return buf.length; + }, + write(fd, buf, offset, length, position, callback) { + if (offset !== 0 || length !== buf.length || position !== null) { + callback(enosys()); + return; + } + const n = this.writeSync(fd, buf); + callback(null, n); + }, + chmod(path, mode, callback) { callback(enosys()); }, + chown(path, uid, gid, callback) { callback(enosys()); }, + close(fd, callback) { callback(enosys()); }, + fchmod(fd, mode, callback) { callback(enosys()); }, + fchown(fd, uid, gid, callback) { callback(enosys()); }, + fstat(fd, callback) { callback(enosys()); }, + fsync(fd, callback) { callback(null); }, + ftruncate(fd, length, callback) { callback(enosys()); }, + lchown(path, uid, gid, callback) { callback(enosys()); }, + link(path, link, callback) { callback(enosys()); }, + lstat(path, callback) { callback(enosys()); }, + mkdir(path, perm, callback) { callback(enosys()); }, + open(path, flags, mode, callback) { callback(enosys()); }, + read(fd, buffer, offset, length, position, callback) { callback(enosys()); }, + readdir(path, callback) { callback(enosys()); }, + readlink(path, callback) { callback(enosys()); }, + rename(from, to, callback) { callback(enosys()); }, + rmdir(path, callback) { callback(enosys()); }, + stat(path, callback) { callback(enosys()); }, + symlink(path, link, callback) { callback(enosys()); }, + truncate(path, length, callback) { callback(enosys()); }, + unlink(path, callback) { callback(enosys()); }, + utimes(path, atime, mtime, callback) { callback(enosys()); }, + }; + } + + if (!globalThis.process) { + globalThis.process = { + getuid() { return -1; }, + getgid() { return -1; }, + geteuid() { return -1; }, + getegid() { return -1; }, + getgroups() { throw enosys(); }, + pid: -1, + ppid: -1, + umask() { throw enosys(); }, + cwd() { throw enosys(); }, + chdir() { throw enosys(); }, + } + } + + if (!globalThis.crypto) { + throw new Error("globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)"); + } + + if (!globalThis.performance) { + throw new Error("globalThis.performance is not available, polyfill required (performance.now only)"); + } + + if (!globalThis.TextEncoder) { + throw new Error("globalThis.TextEncoder is not available, polyfill required"); + } + + if (!globalThis.TextDecoder) { + throw new Error("globalThis.TextDecoder is not available, polyfill required"); + } + + const encoder = new TextEncoder("utf-8"); + const decoder = new TextDecoder("utf-8"); + + globalThis.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 setInt64 = (addr, v) => { + this.mem.setUint32(addr + 0, v, true); + this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true); + } + + const setInt32 = (addr, v) => { + this.mem.setUint32(addr + 0, v, true); + } + + const getInt64 = (addr) => { + const low = this.mem.getUint32(addr + 0, true); + const high = this.mem.getInt32(addr + 4, true); + return low + high * 4294967296; + } + + const loadValue = (addr) => { + const f = this.mem.getFloat64(addr, true); + if (f === 0) { + return undefined; + } + if (!isNaN(f)) { + return f; + } + + const id = this.mem.getUint32(addr, true); + return this._values[id]; + } + + const storeValue = (addr, v) => { + const nanHead = 0x7FF80000; + + if (typeof v === "number" && v !== 0) { + if (isNaN(v)) { + this.mem.setUint32(addr + 4, nanHead, true); + this.mem.setUint32(addr, 0, true); + return; + } + this.mem.setFloat64(addr, v, true); + return; + } + + if (v === undefined) { + this.mem.setFloat64(addr, 0, true); + return; + } + + let id = this._ids.get(v); + if (id === undefined) { + id = this._idPool.pop(); + if (id === undefined) { + id = this._values.length; + } + this._values[id] = v; + this._goRefCounts[id] = 0; + this._ids.set(v, id); + } + this._goRefCounts[id]++; + let typeFlag = 0; + switch (typeof v) { + case "object": + if (v !== null) { + typeFlag = 1; + } + break; + case "string": + typeFlag = 2; + break; + case "symbol": + typeFlag = 3; + break; + case "function": + typeFlag = 4; + break; + } + this.mem.setUint32(addr + 4, nanHead | typeFlag, true); + this.mem.setUint32(addr, id, 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 = { + _gotest: { + add: (a, b) => a + b, + }, + gojs: { + // 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) => { + sp >>>= 0; + const code = this.mem.getInt32(sp + 8, true); + this.exited = true; + delete this._inst; + delete this._values; + delete this._goRefCounts; + delete this._ids; + delete this._idPool; + this.exit(code); + }, + + // func wasmWrite(fd uintptr, p unsafe.Pointer, n int32) + "runtime.wasmWrite": (sp) => { + sp >>>= 0; + const fd = getInt64(sp + 8); + const p = getInt64(sp + 16); + const n = this.mem.getInt32(sp + 24, true); + fs.writeSync(fd, new Uint8Array(this._inst.exports.mem.buffer, p, n)); + }, + + // func resetMemoryDataView() + "runtime.resetMemoryDataView": (sp) => { + sp >>>= 0; + this.mem = new DataView(this._inst.exports.mem.buffer); + }, + + // func nanotime1() int64 + "runtime.nanotime1": (sp) => { + sp >>>= 0; + setInt64(sp + 8, (timeOrigin + performance.now()) * 1000000); + }, + + // func walltime() (sec int64, nsec int32) + "runtime.walltime": (sp) => { + sp >>>= 0; + const msec = (new Date).getTime(); + setInt64(sp + 8, msec / 1000); + this.mem.setInt32(sp + 16, (msec % 1000) * 1000000, true); + }, + + // func scheduleTimeoutEvent(delay int64) int32 + "runtime.scheduleTimeoutEvent": (sp) => { + sp >>>= 0; + 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), + )); + this.mem.setInt32(sp + 16, id, true); + }, + + // func clearTimeoutEvent(id int32) + "runtime.clearTimeoutEvent": (sp) => { + sp >>>= 0; + const id = this.mem.getInt32(sp + 8, true); + clearTimeout(this._scheduledTimeouts.get(id)); + this._scheduledTimeouts.delete(id); + }, + + // func getRandomData(r []byte) + "runtime.getRandomData": (sp) => { + sp >>>= 0; + crypto.getRandomValues(loadSlice(sp + 8)); + }, + + // func finalizeRef(v ref) + "syscall/js.finalizeRef": (sp) => { + sp >>>= 0; + const id = this.mem.getUint32(sp + 8, true); + this._goRefCounts[id]--; + if (this._goRefCounts[id] === 0) { + const v = this._values[id]; + this._values[id] = null; + this._ids.delete(v); + this._idPool.push(id); + } + }, + + // func stringVal(value string) ref + "syscall/js.stringVal": (sp) => { + sp >>>= 0; + storeValue(sp + 24, loadString(sp + 8)); + }, + + // func valueGet(v ref, p string) ref + "syscall/js.valueGet": (sp) => { + sp >>>= 0; + const result = Reflect.get(loadValue(sp + 8), loadString(sp + 16)); + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 32, result); + }, + + // func valueSet(v ref, p string, x ref) + "syscall/js.valueSet": (sp) => { + sp >>>= 0; + Reflect.set(loadValue(sp + 8), loadString(sp + 16), loadValue(sp + 32)); + }, + + // func valueDelete(v ref, p string) + "syscall/js.valueDelete": (sp) => { + sp >>>= 0; + Reflect.deleteProperty(loadValue(sp + 8), loadString(sp + 16)); + }, + + // func valueIndex(v ref, i int) ref + "syscall/js.valueIndex": (sp) => { + sp >>>= 0; + storeValue(sp + 24, Reflect.get(loadValue(sp + 8), getInt64(sp + 16))); + }, + + // valueSetIndex(v ref, i int, x ref) + "syscall/js.valueSetIndex": (sp) => { + sp >>>= 0; + 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) => { + sp >>>= 0; + 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() >>> 0; // see comment above + storeValue(sp + 56, result); + this.mem.setUint8(sp + 64, 1); + } catch (err) { + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 56, err); + this.mem.setUint8(sp + 64, 0); + } + }, + + // func valueInvoke(v ref, args []ref) (ref, bool) + "syscall/js.valueInvoke": (sp) => { + sp >>>= 0; + try { + const v = loadValue(sp + 8); + const args = loadSliceOfValues(sp + 16); + const result = Reflect.apply(v, undefined, args); + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, result); + this.mem.setUint8(sp + 48, 1); + } catch (err) { + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, err); + this.mem.setUint8(sp + 48, 0); + } + }, + + // func valueNew(v ref, args []ref) (ref, bool) + "syscall/js.valueNew": (sp) => { + sp >>>= 0; + try { + const v = loadValue(sp + 8); + const args = loadSliceOfValues(sp + 16); + const result = Reflect.construct(v, args); + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, result); + this.mem.setUint8(sp + 48, 1); + } catch (err) { + sp = this._inst.exports.getsp() >>> 0; // see comment above + storeValue(sp + 40, err); + this.mem.setUint8(sp + 48, 0); + } + }, + + // func valueLength(v ref) int + "syscall/js.valueLength": (sp) => { + sp >>>= 0; + setInt64(sp + 16, parseInt(loadValue(sp + 8).length)); + }, + + // valuePrepareString(v ref) (ref, int) + "syscall/js.valuePrepareString": (sp) => { + sp >>>= 0; + 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) => { + sp >>>= 0; + const str = loadValue(sp + 8); + loadSlice(sp + 16).set(str); + }, + + // func valueInstanceOf(v ref, t ref) bool + "syscall/js.valueInstanceOf": (sp) => { + sp >>>= 0; + this.mem.setUint8(sp + 24, (loadValue(sp + 8) instanceof loadValue(sp + 16)) ? 1 : 0); + }, + + // func copyBytesToGo(dst []byte, src ref) (int, bool) + "syscall/js.copyBytesToGo": (sp) => { + sp >>>= 0; + const dst = loadSlice(sp + 8); + const src = loadValue(sp + 32); + if (!(src instanceof Uint8Array || src instanceof Uint8ClampedArray)) { + this.mem.setUint8(sp + 48, 0); + return; + } + const toCopy = src.subarray(0, dst.length); + dst.set(toCopy); + setInt64(sp + 40, toCopy.length); + this.mem.setUint8(sp + 48, 1); + }, + + // func copyBytesToJS(dst ref, src []byte) (int, bool) + "syscall/js.copyBytesToJS": (sp) => { + sp >>>= 0; + const dst = loadValue(sp + 8); + const src = loadSlice(sp + 16); + if (!(dst instanceof Uint8Array || dst instanceof Uint8ClampedArray)) { + this.mem.setUint8(sp + 48, 0); + return; + } + const toCopy = src.subarray(0, dst.length); + dst.set(toCopy); + setInt64(sp + 40, toCopy.length); + this.mem.setUint8(sp + 48, 1); + }, + + "debug": (value) => { + console.log(value); + }, + } + }; + } + + async run(instance) { + if (!(instance instanceof WebAssembly.Instance)) { + throw new Error("Go.run: WebAssembly.Instance expected"); + } + this._inst = instance; + this.mem = new DataView(this._inst.exports.mem.buffer); + this._values = [ // JS values that Go currently has references to, indexed by reference id + NaN, + 0, + null, + true, + false, + globalThis, + this, + ]; + this._goRefCounts = new Array(this._values.length).fill(Infinity); // number of references that Go has to a JS value, indexed by reference id + this._ids = new Map([ // mapping from JS values to reference ids + [0, 1], + [null, 2], + [true, 3], + [false, 4], + [globalThis, 5], + [this, 6], + ]); + this._idPool = []; // unused ids that have been garbage collected + this.exited = false; // whether the Go program has exited + + // 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(this.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)); + }); + argvPtrs.push(0); + + const keys = Object.keys(this.env).sort(); + keys.forEach((key) => { + argvPtrs.push(strPtr(`${key}=${this.env[key]}`)); + }); + argvPtrs.push(0); + + const argv = offset; + argvPtrs.forEach((ptr) => { + this.mem.setUint32(offset, ptr, true); + this.mem.setUint32(offset + 4, 0, true); + offset += 8; + }); + + // The linker guarantees global data starts from at least wasmMinDataAddr. + // Keep in sync with cmd/link/internal/ld/data.go:wasmMinDataAddr. + const wasmMinDataAddr = 4096 + 8192; + if (offset >= wasmMinDataAddr) { + throw new Error("total length of command line and environment variables exceeds limit"); + } + + 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; + }; + } + } +})();