forked from mirrors/gecko-dev
5c7cdbd4ba
# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D35940 --HG-- extra : source : d214f0c82813e5a8d3987debc490a2c11f1308ff
83 lines
2.4 KiB
JavaScript
83 lines
2.4 KiB
JavaScript
/**
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* @fileoverview Simply marks exported symbols as used. Designed for use in
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* .jsm files only.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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"use strict";
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function markArrayElementsAsUsed(context, node, expression) {
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if (expression.type != "ArrayExpression") {
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context.report({
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node,
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message: "Unexpected assignment of non-Array to EXPORTED_SYMBOLS",
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});
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return;
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}
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for (let element of expression.elements) {
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context.markVariableAsUsed(element.value);
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}
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// Also mark EXPORTED_SYMBOLS as used.
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context.markVariableAsUsed("EXPORTED_SYMBOLS");
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}
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// -----------------------------------------------------------------------------
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// Rule Definition
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// -----------------------------------------------------------------------------
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module.exports = function(context) {
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// Ignore assignments not in the global scope, e.g. where special module
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// definitions are required due to having different ways of importing files,
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// e.g. osfile.
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function isGlobalScope() {
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return !context.getScope().upper;
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}
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// ---------------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------------
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return {
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AssignmentExpression(node, parents) {
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if (
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node.operator === "=" &&
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node.left.type === "MemberExpression" &&
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node.left.object.type === "ThisExpression" &&
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node.left.property.name === "EXPORTED_SYMBOLS" &&
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isGlobalScope()
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) {
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markArrayElementsAsUsed(context, node, node.right);
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}
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},
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VariableDeclaration(node, parents) {
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if (!isGlobalScope()) {
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return;
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}
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for (let item of node.declarations) {
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if (
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item.id &&
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item.id.type == "Identifier" &&
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item.id.name === "EXPORTED_SYMBOLS"
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) {
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if (node.kind === "let") {
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// The use of 'let' isn't allowed as the lexical scope may die after
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// the script executes.
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context.report({
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node,
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message:
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"EXPORTED_SYMBOLS cannot be declared via `let`. Use `var` or `this.EXPORTED_SYMBOLS =`",
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});
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}
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markArrayElementsAsUsed(context, node, item.init);
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}
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}
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},
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};
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};
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