babel-plugin-ember-template-compilation
Version:
Babel implementation of Ember's low-level template-compilation API
120 lines • 16.6 kB
JavaScript
;
/*
This class exists because:
- before template compilation starts, we need to pass a `locals` array to
ember-template-compiler
- the JSUtils API can mutate the scope during template compilation
- those scope mutations need to update both the original `locals` array and
our own name mapping, keeping them in sync.
*/
var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
if (kind === "m") throw new TypeError("Private method is not writable");
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
};
var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
};
var _ScopeLocals_instances, _ScopeLocals_mapping, _ScopeLocals_locals, _ScopeLocals_params, _ScopeLocals_isInJsScope;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ScopeLocals = void 0;
const hbs_utils_1 = require("./hbs-utils");
const read_only_array_1 = require("./read-only-array");
class ScopeLocals {
constructor(params) {
_ScopeLocals_instances.add(this);
_ScopeLocals_mapping.set(this, {});
_ScopeLocals_locals.set(this, []);
_ScopeLocals_params.set(this, void 0);
__classPrivateFieldSet(this, _ScopeLocals_params, params, "f");
}
get locals() {
return (0, read_only_array_1.readOnlyArray)(__classPrivateFieldGet(this, _ScopeLocals_locals, "f"), 'The only supported way to manipulate locals is via the jsutils API\nhttps://github.com/emberjs/babel-plugin-ember-template-compilation#jsutils-manipulating-javascript-from-within-ast-transforms');
}
has(key) {
return key in __classPrivateFieldGet(this, _ScopeLocals_mapping, "f");
}
get(key) {
return __classPrivateFieldGet(this, _ScopeLocals_mapping, "f")[key];
}
isEmpty() {
return __classPrivateFieldGet(this, _ScopeLocals_locals, "f").length === 0;
}
entries() {
return Object.entries(__classPrivateFieldGet(this, _ScopeLocals_mapping, "f"));
}
add(hbsName, jsName) {
__classPrivateFieldGet(this, _ScopeLocals_mapping, "f")[hbsName] = jsName !== null && jsName !== void 0 ? jsName : hbsName;
if (!__classPrivateFieldGet(this, _ScopeLocals_locals, "f").includes(hbsName)) {
__classPrivateFieldGet(this, _ScopeLocals_locals, "f").push(hbsName);
}
}
// this AST transform discovers all possible upvars in HBS that refer to valid
// bindings in JS, and then depending on the mode adjusts our actual scope bag
// contents.
crawl() {
return (_env) => {
let seen;
return {
name: 'scope-locals-crawl',
visitor: {
Template: {
enter: () => {
seen = new Set();
},
exit: (_node, _path) => {
if (__classPrivateFieldGet(this, _ScopeLocals_params, "f").mode === 'implicit') {
// all hbs upvars that have matching JS bindings go into the
// scope
for (let name of seen) {
if (__classPrivateFieldGet(this, _ScopeLocals_instances, "m", _ScopeLocals_isInJsScope).call(this, name, __classPrivateFieldGet(this, _ScopeLocals_params, "f").jsPath)) {
this.add(name);
}
}
}
else {
// in explicit form, we might prune back the preexising scope in
// the case where another AST transform has eliminated the use
// of the original binding. But we don't add anything new. The
// only way for new bindings to be introduced into scope is for
// another AST transform to explicitly call the jsutils, which
// calls our `add`.
for (let name of Object.keys(__classPrivateFieldGet(this, _ScopeLocals_mapping, "f"))) {
if (!seen.has(name)) {
__classPrivateFieldGet(this, _ScopeLocals_locals, "f").splice(__classPrivateFieldGet(this, _ScopeLocals_locals, "f").indexOf(name), 1);
delete __classPrivateFieldGet(this, _ScopeLocals_mapping, "f")[name];
}
}
}
},
},
PathExpression: (node, path) => {
if (node.head.type !== 'VarHead') {
return;
}
const name = node.head.name;
if (!(0, hbs_utils_1.astNodeHasBinding)(path, name)) {
seen.add(name);
}
},
ElementNode: (node, path) => {
const name = node.tag.split('.')[0];
if (!(0, hbs_utils_1.astNodeHasBinding)(path, name)) {
seen.add(name);
}
},
},
};
};
}
}
exports.ScopeLocals = ScopeLocals;
_ScopeLocals_mapping = new WeakMap(), _ScopeLocals_locals = new WeakMap(), _ScopeLocals_params = new WeakMap(), _ScopeLocals_instances = new WeakSet(), _ScopeLocals_isInJsScope = function _ScopeLocals_isInJsScope(hbsName, jsPath) {
var _a;
let jsName = (_a = __classPrivateFieldGet(this, _ScopeLocals_mapping, "f")[hbsName]) !== null && _a !== void 0 ? _a : hbsName;
return ['globalThis'].includes(jsName) || jsPath.scope.getBinding(jsName);
};
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hbsName;\n    if (!this.#locals.includes(hbsName)) {\n      this.#locals.push(hbsName);\n    }\n  }\n\n  #isInJsScope(hbsName: string, jsPath: NodePath) {\n    let jsName = this.#mapping[hbsName] ?? hbsName;\n    return ['globalThis'].includes(jsName) || jsPath.scope.getBinding(jsName);\n  }\n\n  // this AST transform discovers all possible upvars in HBS that refer to valid\n  // bindings in JS, and then depending on the mode adjusts our actual scope bag\n  // contents.\n  crawl() {\n    return (_env: ASTPluginEnvironment): { name: string; visitor: NodeVisitor } => {\n      let seen: Set<string>;\n      return {\n        name: 'scope-locals-crawl',\n        visitor: {\n          Template: {\n            enter: () => {\n              seen = new Set();\n            },\n            exit: (_node, _path) => {\n              if (this.#params.mode === 'implicit') {\n                // all hbs upvars that have matching JS bindings go into the\n                // scope\n                for (let name of seen) {\n                  if (this.#isInJsScope(name, this.#params.jsPath)) {\n                    this.add(name);\n                  }\n                }\n              } else {\n                // in explicit form, we might prune back the preexising scope in\n                // the case where another AST transform has eliminated the use\n                // of the original binding. But we don't add anything new. The\n                // only way for new bindings to be introduced into scope is for\n                // another AST transform to explicitly call the jsutils, which\n                // calls our `add`.\n                for (let name of Object.keys(this.#mapping)) {\n                  if (!seen.has(name)) {\n                    this.#locals.splice(this.#locals.indexOf(name), 1);\n                    delete this.#mapping[name];\n                  }\n                }\n              }\n            },\n          },\n          PathExpression: (node, path) => {\n            if (node.head.type !== 'VarHead') {\n              return;\n            }\n            const name = node.head.name;\n            if (!astNodeHasBinding(path, name)) {\n              seen.add(name);\n            }\n          },\n          ElementNode: (node, path) => {\n            const name = node.tag.split('.')[0];\n            if (!astNodeHasBinding(path, name)) {\n              seen.add(name);\n            }\n          },\n        },\n      };\n    };\n  }\n}\n"]}