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ELS – The Ember Language Server
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Tobias Bieniek
October 11, 2018
Programming
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ELS – The Ember Language Server
Tobias Bieniek
October 11, 2018
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Transcript
ELS the Ember Language Server
Turbo87 TobiasBieniek
simplabs based in Munich consulting all over ! * Stickers
available after the talk
Disclaimer this talk contains simplified code examples! the real code
is available at https://github.com/emberwatch/ember-language-server
What text editor do you use? " # $ %
$ & ' ( ) * " *
None
Goto Class
Goto Definition
IntelliJ-only
vim Emacs VS Code IntelliJ JavaScript ❓ ❓ ❓ ❓
CSS ❓ ❓ ❓ ❓ Ember.js ❓ ❓ ❓ ❓ Rust ❓ ❓ ❓ ❓
JavaScript ✅ CSS ✅ Ember.js ✅ Rust ✅ vim ✅
Emacs ✅ VS Code ✅ IntelliJ ✅
JavaScript javascript- typescript- langserver CSS vscode-css- languageserver Ember.js ember-language- server
Rust rust-language- server vim vim-lsp Emacs emacs-lsp VS Code builtin! IntelliJ
HTTP JSON API
ELS JSON-RPC Language Server Protocol HTTP JSON API
JSON-RPC 2.0 Request { "jsonrpc": "2.0", "id": 42, "method": "add",
"params": { "a": 1, "b": 2, }, } Response { "jsonrpc": "2.0", "id": 42, "result": 3, "error": null, }
vscode-languageserver
Syntax Highlighting
Syntax Highlighting (sorry, not responsible for that...) https://github.com/Microsoft/language-server-protocol/issues/33#issuecomment-231883169
Autocomplete
Request { "method": "textDocument/completion", "params": { "textDocument": { "uri": "file:
///Users/tbieniek/Code/crates.io/app/templates/index.hbs", }, "position": { "line": 5, "character": 18, }, }, }
import URI from 'vscode-uri'; let uri = URI.parse( 'file: ///Users/tbieniek/Code/crates.io/app/templates/index.hbs'
) let path = uri.fsPath; // -> /Users/tbieniek/Code/crates.io/app/templates/index.hbs
import fs from 'fs'; let content = fs.readFileSync( '/Users/tbieniek/Code/crates.io/app/templates/index.hbs', {
encoding: 'utf-8' }, ); let lines = content.split('\n'); let line = line[5]; let character = line[18]; // -> a
import fs from 'fs'; import { preprocess } from '@glimmer/syntax';
let content = fs.readFileSync( '/Users/tbieniek/Code/crates.io/app/templates/index.hbs', { encoding: 'utf-8' }, ); let ast = preprocess(content); // -> Abstract Syntax T ree
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
AST Explorer https://astexplorer.net
{{button onclick=(a)}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression Cursor
path: { type: 'PathExpression', original: 'a', this: false, parts: [
'a', ], data: false, loc: { start: { line: 5, column: 18, }, end: { line: 5, column: 19, }, }, } Program -> MustacheStatement -> PathExpression -> Hash -> HashPair -> SubExpression -> PathExpression
path: { type: 'PathExpression', original: 'a', this: false, parts: [
'a', ], data: false, loc: { start: { line: 5, column: 18, }, end: { line: 5, column: 19, }, }, } position: { line: 5, character: 18, } Program -> MustacheStatement -> PathExpression -> Hash -> HashPair -> SubExpression -> PathExpression
let node = findNodeAtPosition(ast, position); let isSubExpressionPath = ( node.type
=== 'PathExpression' && node.parent.type === 'SubExpression' ); if (isSubExpressionPath) { return SUB_EXPRESSION_HELPERS; }
const SUB_EXPRESSION_HELPER_NAMES = [ 'action', 'component', 'concat', 'get', 'if', 'unless',
]; const SUB_EXPRESSION_HELPERS = SUB_EXPRESSION_HELPER_NAMES .map(name => ({ label: name, kind: CompletionItemKind.Function, }));
Autocomplete ✅
Autocomplete #2
import path from 'path'; import findUp from 'find-up'; let projectRoot
= findUp.sync('ember-cli-build.js', { cwd: path.dirname( '/Users/tbieniek/Code/crates.io/app/templates/index.hbs' ), }); // -> /Users/tbieniek/Code/crates.io
import glob from 'fast-glob'; let components = glob.sync(['**/*.js'], { cwd:
`${projectRoot}/app/components`, }); let templates = glob.sync(['**/*.hbs'], { cwd: `${projectRoot}/app/templates/components`, });
import glob from 'fast-glob'; let components = glob.sync(['**/*.js'], { cwd:
`${projectRoot}/app/components`, }); let templates = glob.sync(['**/*.hbs'], { cwd: `${projectRoot}/app/templates/components`, }); let names = components .concat(templates) .map(filePath => stripExtension(filePath));
import glob from 'fast-glob'; let components = glob.sync(['**/*.js'], { cwd:
`${projectRoot}/app/components`, }); let templates = glob.sync(['**/*.hbs'], { cwd: `${projectRoot}/app/templates/components`, }); let names = components .concat(templates) .map(filePath => stripExtension(filePath)); let uniqueNames = Array.from(new Set(names));
let names = components .concat(templates) .map(filePath => stripExtension(filePath)); let uniqueNames
= Array.from(new Set(names)); return uniqueNames.map(name => ({ label: name, kind: CompletionItemKind.Class, }));
Autocomplete #2 ✅
Goto Definition
Request { "method": "textDocument/definition", "params": { "textDocument": { "uri": "file:
///Users/tbieniek/Code/crates.io/app/templates/crate.hbs", }, "position": { "line": 92, "character": 14, }, }, }
{{crate-readme rendered=crate.readme}} Program -> MustacheStatement -> PathExpression -> Hash ->
HashPair -> SubExpression -> PathExpression
let node = findNodeAtPosition(ast, position); let isMustacheStatementPath = ( node.type
=== 'PathExpression' && node.parent.type === 'MustacheStatement' ); if (!isMustacheStatementPath) { return; }
import path from 'path'; import findUp from 'find-up'; let projectRoot
= findUp.sync('ember-cli-build.js', { cwd: path.dirname( '/Users/tbieniek/Code/crates.io/app/templates/crate.hbs' ), }); // -> /Users/tbieniek/Code/crates.io
import URI from 'vscode-uri'; let componentPath = `${projectRoot}/app/components/${node.original}.js`; if (fs.existsSync(componentPath))
{ results.push({ uri: URI.file(componentPath), range: { start: ..., end: ... }, }); }
What else can we build with this?
{{#link-to "index"}}Home{{/link-to}} • app/controllers/index.js • app/routes/index.js • app/templates/index.hbs
import DS from 'ember-data'; export default DS.Model.extend({ crates: DS.hasMany('crate'), });
• app/adapters/crate.js • app/models/crate.js • app/serializers/crate.js
import Component from '@ember/component'; import { inject as service }
from '@ember/service'; export default Component.extend({ session: service('session'), }); • app/services/session.js
{{t "my-name-is"}} • translations/de.json • translations/en.json • translations/fr.json • translations/nl.json
Caveats (roadblocks and deviations)
Compiler vs. Editor
Compiler > must produce 100% correct output > expects 100%
valid input
Editor > is allowed to produce incomplete output > should
handle incomplete/invalid input
@glimmer/syntax > written for the template compiler > can not
handle incomplete/invalid input {{#link-to "|
ELS Editor Support
ELS Editor Support > VSCode ... done (vscode-ember extension) >
Atom ... done (ide-ember package) > emacs ... work-in-progress > vim ... )
Wishlist (not yet supported by LSP)
File Type Icons
Goto Related File from the crates controller
Goto Related File > cycle through controller, route, template >
or component and template > or model, adapter, serializer > or to the related test file
Inline Translations
emberwatch/ember-language-server #topic-editors
ELS the Ember Language Server Thanks!