/
parse.js
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/
parse.js
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/**
* @fileoverview Tests for parse().
* @author Nicholas C. Zakas
*/
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
import fs from "fs";
import tester from "./tester.js";
import * as espree from "../../espree.js";
import assert from "assert";
const allPiecesJson = JSON.parse(fs.readFileSync("./tests/fixtures/parse/all-pieces.json", "utf8"));
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
describe("parse()", () => {
describe("ecmaVersion", () => {
it("should be 5 if not specified", () => {
// `ecmaVersion: 3` would throw on getters/setters
espree.parse("var foo = { get bar() {} }");
// needs `ecmaVersion: 6` or higher
assert.throws(() => {
espree.parse("let foo");
});
});
});
describe("modules", () => {
it("should have correct column number when strict mode error occurs", () => {
try {
espree.parse("function fn(a, a) {\n}", { ecmaVersion: 6, sourceType: "module" });
} catch (err) {
assert.strictEqual(err.column, 16);
}
});
});
describe("ES5", () => {
it("should throw an error when using the y regex flag", () => {
assert.throws(() => {
espree.parse("/./y");
});
});
it("should throw an error when using the u regex flag", () => {
assert.throws(() => {
espree.parse("/./u");
});
});
});
describe("general", () => {
it("should output tokens, comments, locs, and ranges when called with those options", () => {
const ast = espree.parse("let foo = bar;", {
ecmaVersion: 6,
comment: true,
tokens: true,
range: true,
loc: true
});
assert.deepStrictEqual(tester.getRaw(ast), allPiecesJson);
});
it("should output the same value for program.start, end and range when there is a leading/trailing comments", () => {
const ast = espree.parse("/* foo */ bar /* baz */", {
range: true
});
assert.strictEqual(ast.start, ast.range[0]);
assert.strictEqual(ast.end, ast.range[1]);
});
it("should output the same value for program.start, end as when ranges are returned and there is a leading/trailing comments using default options", () => {
const ast = espree.parse("/* foo */ bar /* baz */");
assert.strictEqual(ast.start, 10);
assert.strictEqual(ast.end, 13);
});
it("should output the same value for program.start, end and range and loc when there is a leading comments with range and loc true", () => {
const ast = espree.parse("/* foo */ bar", {
range: true,
loc: true
});
assert.strictEqual(ast.start, ast.range[0]);
assert.strictEqual(ast.end, ast.range[1]);
assert.strictEqual(ast.start, ast.loc.start.column);
assert.strictEqual(ast.end, ast.loc.end.column);
});
it("should output the same value for program.start, end and loc when there is a leading comments with loc", () => {
const ast = espree.parse("/* foo */ bar", {
loc: true
});
assert.strictEqual(ast.start, ast.loc.start.column);
assert.strictEqual(ast.end, ast.loc.end.column);
});
it("should output the same value for program.start, end and range when there is a trailing comments", () => {
const ast = espree.parse(" bar /* foo */", {
range: true
});
assert.strictEqual(ast.start, ast.range[0]);
assert.strictEqual(ast.end, ast.range[1]);
});
it("should output the same value for range and start and end in templateElement with range", () => {
const ast = espree.parse("`foo ${bar}`;", {
ecmaVersion: 6,
range: true
});
assert.strictEqual(ast.body[0].expression.quasis[0].start, ast.body[0].expression.quasis[0].range[0]);
assert.strictEqual(ast.body[0].expression.quasis[0].end, ast.body[0].expression.quasis[0].range[1]);
assert.strictEqual(ast.body[0].expression.quasis[1].start, ast.body[0].expression.quasis[1].range[0]);
assert.strictEqual(ast.body[0].expression.quasis[1].end, ast.body[0].expression.quasis[1].range[1]);
});
it("should output the same value for loc and start and end in templateElement with loc", () => {
const ast = espree.parse("`foo ${bar}`;", {
ecmaVersion: 6,
loc: true
});
assert.strictEqual(ast.body[0].expression.quasis[0].start, ast.body[0].expression.quasis[0].loc.start.column);
assert.strictEqual(ast.body[0].expression.quasis[0].end, ast.body[0].expression.quasis[0].loc.end.column);
assert.strictEqual(ast.body[0].expression.quasis[1].start, ast.body[0].expression.quasis[1].loc.start.column);
assert.strictEqual(ast.body[0].expression.quasis[1].end, ast.body[0].expression.quasis[1].loc.end.column);
});
it("should output the same value for loc, range and start and end in templateElement with loc and range", () => {
const ast = espree.parse("`foo ${bar}`;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.strictEqual(ast.body[0].expression.quasis[0].start, ast.body[0].expression.quasis[0].loc.start.column);
assert.strictEqual(ast.body[0].expression.quasis[0].end, ast.body[0].expression.quasis[0].loc.end.column);
assert.strictEqual(ast.body[0].expression.quasis[0].start, ast.body[0].expression.quasis[0].range[0]);
assert.strictEqual(ast.body[0].expression.quasis[0].end, ast.body[0].expression.quasis[0].range[1]);
assert.strictEqual(ast.body[0].expression.quasis[1].start, ast.body[0].expression.quasis[1].loc.start.column);
assert.strictEqual(ast.body[0].expression.quasis[1].end, ast.body[0].expression.quasis[1].loc.end.column);
assert.strictEqual(ast.body[0].expression.quasis[1].start, ast.body[0].expression.quasis[1].range[0]);
assert.strictEqual(ast.body[0].expression.quasis[1].end, ast.body[0].expression.quasis[1].range[1]);
});
it("should output the same value for start and end in templateElement as when ranges are present", () => {
const ast = espree.parse("`foo ${bar}`;", {
ecmaVersion: 6
});
assert.strictEqual(ast.body[0].expression.quasis[0].start, 0);
assert.strictEqual(ast.body[0].expression.quasis[0].end, 7);
assert.strictEqual(ast.body[0].expression.quasis[1].start, 10);
assert.strictEqual(ast.body[0].expression.quasis[1].end, 12);
});
it("should reset lastToken on each parse", () => {
espree.parse("var foo = bar;");
const ast = espree.parse("//foo", {
comment: true,
tokens: true,
range: true,
loc: true
});
assert.deepStrictEqual(ast.range, [0, 5]);
assert.deepStrictEqual([ast.loc.start.line, ast.loc.start.column], [1, 0]);
assert.deepStrictEqual([ast.loc.end.line, ast.loc.end.column], [1, 5]);
});
it("should not mutate config", () => {
espree.parse("foo", Object.freeze({ ecmaFeatures: Object.freeze({}) }));
});
it("Cast valid non-string input", () => {
const str = "var foo = bar;";
assert.deepStrictEqual(
espree.parse(Buffer.from(str)),
espree.parse(str)
);
});
// https://github.com/eslint/espree/issues/470
it("Should throw on invalid `(a = 1) = t`", () => {
assert.throws(() => {
espree.parse("(a = 1) = t", { ecmaVersion: 6 });
});
});
// https://github.com/eslint/espree/issues/472
it("Should throw on invalid `async () => await 5 ** 6;`", () => {
assert.throws(() => {
espree.parse("async () => await 5 ** 6;", { ecmaVersion: 10 });
});
});
});
describe("nodes", () => {
it("should not re-use the same identifier node in shorthand properties", () => {
const code = "({x, y = 1} = {z})";
const ast = espree.parse(code, { ecmaVersion: 2015 });
const assignment = ast.body[0].expression;
const objectPattern = assignment.left;
const objectExpression = assignment.right;
const propertyX = objectPattern.properties[0];
const propertyY = objectPattern.properties[1];
const propertyZ = objectExpression.properties[0];
assert.notStrictEqual(propertyX.key, propertyX.value);
assert.notStrictEqual(propertyY.key, propertyY.value.left);
assert.notStrictEqual(propertyZ.key, propertyZ.value);
});
});
});