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root = true
[*]
charset = utf-8
end_of_line = lf
indent_size = 2
indent_style = space
insert_final_newline = true
trim_trailing_whitespace = true
[*.rs]
indent_size = 4

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This project is governed by the Contributor Covenant version 2.0 (https://www.contributor-covenant.org/version/2/0/code_of_conduct).
All contributors and participants agree to abide by its terms.
To report violations, send an email to darinmorrison+conduct@gmail.com.

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SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

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README.md Normal file
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<div align="center">
<h1><code>tower-lsp-wasm-example</code></h1>
<p>
<strong>A minimal WASM target example for tower-lsp</strong>
</p>
</div>
## Building
NOTE: this example uses [ReadableByteStreamController](https://developer.mozilla.org/en-US/docs/Web/API/ReadableByteStreamController#browser_compatibility) which, as of writing this, is only supported yet on chromium based browsers.
```sh
cargo install wasm-bindgen-cli --version 0.2.80
cd server
RUSTFLAGS=--cfg=web_sys_unstable_apis cargo build --release --target wasm32-unknown-unknown
wasm-bindgen --out-dir ../app/dist --target web --typescript ./target/wasm32-unknown-unknown/release/server.wasm
cd ..
cd app
npm i
npm run build
```
## Running
```sh
cd app
npm run app
```
After the browser window opens, you can try copying and pasting the listed messages into the `stdin` textarea and hitting the `send` button.

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
.container {
box-sizing: border-box;
display: grid;
grid-template-rows: 2fr 4fr 1fr 2fr 4fr;
align-items: center;
width: 50vh;
height: 50vh;
margin-left: auto;
margin-right: auto;
margin-top: 25vh;
}
.container textarea {
width: 100%;
height: 100%;
resize: none;
}
</style>
<title>tower-lsp-wasm-example</title>
</head>
<body>
<pre>
<!-- NOTE: included for easy copy and pasting into stdin textarea -->
{"jsonrpc": "2.0", "method": "initialize", "params": { "capabilities": {}}, "id": 1}
{"jsonrpc": "2.0", "method": "shutdown", "id": 2}
{"jsonrpc": "2.0", "method": "exit"}
</pre>
<div class="container">
<h1>stdin</h1>
<textarea id="stdin" autocomplete="off" spellcheck="off" wrap="off"></textarea>
<button id="send-button">send</button>
<h1>stdout</h1>
<textarea id="stdout" autocomplete="off" spellcheck="off" wrap="off" readonly></textarea>
</div>
<script type="module">
import init, { serve } from "./dist/server.js"
import { LspStdin, LspStdout } from "./dist/index.js"
const stdin = new LspStdin(document.getElementById("stdin"), document.getElementById("send-button"));
const stdout = new LspStdout(document.getElementById("stdout"));
await init();
await serve(stdin, stdout);
</script>
</body>
</html>

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}

15
app/package.json Normal file
View file

@ -0,0 +1,15 @@
{
"name": "tower-lsp-wasm-app",
"version": "0.0.0",
"main": "index.js",
"author": "silvanshade <silvanshade@users.noreply.github.com>",
"license": "Apache-2.0 WITH LLVM-exception",
"scripts": {
"build": "tsc",
"app": "http-server -o"
},
"dependencies": {
"http-server": "^14.1.0",
"typescript": "^4.7.2"
}
}

54
app/src/index.ts Normal file
View file

@ -0,0 +1,54 @@
class LspStdin {
#stream: ReadableStream;
constructor(stdin: HTMLTextAreaElement, sendButton: HTMLButtonElement) {
const encoder = new TextEncoder();
this.#stream = new ReadableStream({
type: "bytes" as any,
async start(controller) {
while (true) {
await new Promise<void>((resolve) => {
sendButton.addEventListener(
"click",
() => {
const payload = stdin.value;
const message = `Content-Length: ${payload.length}\r\n\r\n${payload}`;
const bytes = encoder.encode(message);
controller.enqueue(bytes);
stdin.value = "";
resolve();
},
{ once: true }
);
});
}
},
});
}
getReader(): ReadableStreamDefaultReader {
return this.#stream.getReader();
}
}
class LspStdout {
#stream: WritableStream;
constructor(stdout: HTMLTextAreaElement) {
const decoder = new TextDecoder();
this.#stream = new WritableStream({
async write(bytes) {
const message = decoder.decode(bytes);
const payload = message.replace(/^Content-Length:\s*\d+\s*/, "");
stdout.value += payload;
stdout.value += "\n";
},
});
}
getWriter(): WritableStreamDefaultWriter {
return this.#stream.getWriter();
}
}
export { LspStdin, LspStdout };

105
app/tsconfig.json Normal file
View file

@ -0,0 +1,105 @@
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig to read more about this file */
/* Projects */
"incremental": true, /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./.tsbuildinfo", /* Specify the path to .tsbuildinfo incremental compilation file. */
// "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects. */
// "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "ES2022", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
"lib": ["DOM", "ES2022"], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
// "jsx": "preserve", /* Specify what JSX code is generated. */
// "experimentalDecorators": true, /* Enable experimental support for TC39 stage 2 draft decorators. */
// "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */
// "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
// "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
// "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
// "reactNamespace": "", /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
// "noLib": true, /* Disable including any library files, including the default lib.d.ts. */
// "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */
// "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */
/* Modules */
"module": "ES2022", /* Specify what module code is generated. */
"rootDir": "src", /* Specify the root folder within your source files. */
// "moduleResolution": "node", /* Specify how TypeScript looks up a file from a given module specifier. */
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */
// "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */
// "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */
// "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */
// "types": [], /* Specify type package names to be included without being referenced in a source file. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
// "moduleSuffixes": [], /* List of file name suffixes to search when resolving a module. */
// "resolveJsonModule": true, /* Enable importing .json files. */
// "noResolve": true, /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
/* JavaScript Support */
// "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
// "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */
// "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
/* Emit */
// "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
// "declarationMap": true, /* Create sourcemaps for d.ts files. */
// "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
// "sourceMap": true, /* Create source map files for emitted JavaScript files. */
// "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
"outDir": "dist", /* Specify an output folder for all emitted files. */
// "removeComments": true, /* Disable emitting comments. */
// "noEmit": true, /* Disable emitting files from a compilation. */
// "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
// "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types. */
// "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
// "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */
// "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
"newLine": "lf", /* Set the newline character for emitting files. */
// "stripInternal": true, /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
// "noEmitHelpers": true, /* Disable generating custom helper functions like '__extends' in compiled output. */
// "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */
// "preserveConstEnums": true, /* Disable erasing 'const enum' declarations in generated code. */
// "declarationDir": "./", /* Specify the output directory for generated declaration files. */
// "preserveValueImports": true, /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
/* Interop Constraints */
"isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */
// "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */
"esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
// "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
"forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
/* Type Checking */
"strict": true, /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* When type checking, take into account 'null' and 'undefined'. */
// "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
// "strictBindCallApply": true, /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
// "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */
// "noImplicitThis": true, /* Enable error reporting when 'this' is given the type 'any'. */
// "useUnknownInCatchVariables": true, /* Default catch clause variables as 'unknown' instead of 'any'. */
// "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
// "noUnusedLocals": true, /* Enable error reporting when local variables aren't read. */
// "noUnusedParameters": true, /* Raise an error when a function parameter isn't read. */
// "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */
// "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */
// "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */
// "noUncheckedIndexedAccess": true, /* Add 'undefined' to a type when accessed using an index. */
// "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */
// "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type. */
// "allowUnusedLabels": true, /* Disable error reporting for unused labels. */
// "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true /* Skip type checking all .d.ts files. */
},
"exclude": ["dist"],
"include": ["src/**/*.ts"],
}

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[package]
edition = "2021"
name = "server"
version = "0.1.0"
[features]
default = ["tower-lsp/runtime-agnostic"]
[lib]
crate-type = ["cdylib", "rlib"]
[dependencies]
console_error_panic_hook = "0.1.7"
tower-lsp = { version = "0.17.0", default-features = false }
wasm-bindgen = "0.2.80"
wasm-bindgen-futures = "0.4.30"
wasm-streams = "0.2.3"
web-sys = { version = "0.3.57", features = [ "console", "ReadableStream", "WritableStream" ] }
[dev-dependencies]

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# binop_separator = "Front"
# blank_lines_lower_bound = 0
# blank_lines_upper_bound = 1
# brace_style = "SameLineWhere"
# color = "Auto"
# combine_control_expr = true
comment_width = 100
condense_wildcard_suffixes = true
# control_brace_style = "AlwaysSameLine"
# disable_all_formatting = false
edition = "2018"
empty_item_single_line = false
# enum_discrim_align_threshold = 0
error_on_line_overflow = true
error_on_unformatted = true
# fn_args_layout = "Tall"
# fn_single_line = false
force_explicit_abi = false
# force_multiline_blocks = false
format_code_in_doc_comments = true
format_macro_matchers = true
# format_macro_bodies = true
# format_strings = false
# hard_tabs = false
# hide_parse_errors = false
# ignore = []
imports_granularity = "Crate"
# imports_indent = "Block"
imports_layout = "HorizontalVertical"
# indent_style = "Block"
# inline_attribute_width = 0
# license_template_path = ""
# match_arm_blocks = true
match_block_trailing_comma = true
max_width = 120
# merge_derives = true
newline_style = "Unix"
normalize_comments = true
normalize_doc_attributes = true
overflow_delimited_expr = true
# remove_nested_parens = true
reorder_impl_items = true
# reorder_imports = true
# reorder_modules = true
# report_fixme = "Never"
# report_todo = "Never"
# required_version = "CARGO_PKG_VERSION"
# skip_children = false
# space_after_colon = true
# space_before_colon = false
spaces_around_ranges = true
# struct_field_align_threshold = 0
# struct_lit_single_line = true
# tab_spaces = 4
# trailing_comma = "Vertical"
# trailing_semicolon = true
# type_punctuation_density = "Wide"
unstable_features = true
use_field_init_shorthand = true
# use_small_heuristics = "Max"
use_try_shorthand = true
version = "Two"
# where_single_line = false
wrap_comments = true

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#![cfg(web_sys_unstable_apis)]
use tower_lsp::{jsonrpc, lsp_types::*, LanguageServer, LspService, Server};
use wasm_bindgen::{prelude::*, JsCast};
struct LspServer {
}
#[tower_lsp::async_trait]
impl LanguageServer for LspServer {
async fn initialize(&self, _: InitializeParams) -> jsonrpc::Result<InitializeResult> {
web_sys::console::log_1(&"server::initialize".into());
Ok(InitializeResult {
..InitializeResult::default()
})
}
async fn shutdown(&self) -> jsonrpc::Result<()> {
web_sys::console::log_1(&"server::shutdown".into());
Ok(())
}
}
#[wasm_bindgen]
// NOTE: input needs to be a ReadableByteStream specifically
pub async fn serve(input: web_sys::ReadableStream, output: web_sys::WritableStream) -> Result<(), JsValue> {
console_error_panic_hook::set_once();
web_sys::console::log_1(&"server::serve".into());
let input = JsCast::unchecked_into::<wasm_streams::readable::sys::ReadableStream>(input);
let input = wasm_streams::ReadableStream::from_raw(input);
let input = input.try_into_async_read().map_err(|err| err.0)?;
let output = JsCast::unchecked_into::<wasm_streams::writable::sys::WritableStream>(output);
let output = wasm_streams::WritableStream::from_raw(output);
let output = output.try_into_async_write().map_err(|err| err.0)?;
let (service, messages) = LspService::new(|_client| LspServer {});
Server::new(input, output, messages).serve(service).await;
Ok(())
}