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tokenize.js
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tokenize.js
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/**
* @fileoverview Tests for tokenize().
* @author Nicholas C. Zakas
*/
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
import tester from "./tester.js";
import * as espree from "../../espree.js";
import assert from "assert";
import letResult from "../fixtures/tokenize/let-result.tokens.js";
import constResultTokens from "../fixtures/tokenize/const-result.tokens.js";
import regexpUResultTokens from "../fixtures/tokenize/regexp-u-result.tokens.js";
import regexpYResultTokens from "../fixtures/tokenize/regexp-y-result.tokens.js";
import templateStringSimpleResultTokens from "../fixtures/tokenize/template-string-simple-result.tokens.js";
import templateStringEmbeddedResultTokens from "../fixtures/tokenize/template-string-embedded-result.tokens.js";
import templateStringEmbedded2ResultTokens from "../fixtures/tokenize/template-string-embedded2-result.tokens.js";
import templateStringExpressionsResultTokens from "../fixtures/tokenize/template-string-expressions-result.tokens.js";
import regexInParensResultTokens from "../fixtures/tokenize/regex-in-parens-result.tokens.js";
import notOperatorTokens from "../fixtures/tokenize/not-operator.tokens.js";
import tildeOperatorTokens from "../fixtures/tokenize/tilde-operator.tokens.js";
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
describe("tokenize()", () => {
it("should have latestEcmaVersion as default", () => {
// needs `ecmaVersion: 6` or higher
espree.tokenize("`template`");
});
it("should produce tokens when using let", () => {
const tokens = espree.tokenize("let foo = bar;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), letResult);
});
it("should produce tokens when using const", () => {
const tokens = espree.tokenize("const foo = bar;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), constResultTokens);
});
it("should produce tokens when using regular expression u flag", () => {
const tokens = espree.tokenize("var foo = /foo/u;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), regexpUResultTokens);
});
it("should produce tokens when using regular expression y flag", () => {
const tokens = espree.tokenize("var foo = /foo/y;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), regexpYResultTokens);
});
describe("templateStrings", () => {
it("should produce tokens when tokenizing simple template string", () => {
const tokens = espree.tokenize("var foo = `hi`;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), templateStringSimpleResultTokens);
});
it("should produce tokens when tokenizing template string with embedded variable", () => {
const tokens = espree.tokenize("var foo = `hi${bar}`;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), templateStringEmbeddedResultTokens);
});
it("should produce tokens when tokenizing template string with embedded variable in function call", () => {
const tokens = espree.tokenize("var a; console.log(`${a}`, \"a\");", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), templateStringEmbedded2ResultTokens);
});
it("should produce tokens when parsing template string with embedded variable in function call and with tokens options on", () => {
const ast = espree.parse("var a; console.log(`${a}`, \"a\");", {
ecmaVersion: 6,
tokens: true,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(ast.tokens), templateStringEmbedded2ResultTokens);
});
it("should produce tokens when tokenizing template string with embedded expressions", () => {
const tokens = espree.tokenize("var foo = `Hello ${b}. a + 5 = ${a + 5}`;", {
ecmaVersion: 6,
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), templateStringExpressionsResultTokens);
});
});
// Make sure we don't introduce the same regex parsing error as Esprima
it("should produce tokens when using regular expression wrapped in parens", () => {
const tokens = espree.tokenize("(/foo/).test(bar);", {
loc: true,
range: true
});
assert.deepStrictEqual(tester.getRaw(tokens), regexInParensResultTokens);
});
it("should produce tokens when using regular expression wrapped in parens using parse()", () => {
const ast = espree.parse("(/foo/).test(bar);", {
loc: true,
range: true,
tokens: true
});
assert.deepStrictEqual(tester.getRaw(ast.tokens), regexInParensResultTokens);
});
it("should produce tokens when using not operator", () => {
const ast = espree.parse("!x", {
loc: true,
range: true,
tokens: true
});
assert.deepStrictEqual(tester.getRaw(ast.tokens), notOperatorTokens);
});
it("should produce tokens when using tilde operator", () => {
const ast = espree.parse("~x", {
loc: true,
range: true,
tokens: true
});
assert.deepStrictEqual(tester.getRaw(ast.tokens), tildeOperatorTokens);
});
it("should produce tokens when using a single identifier", () => {
const tokens = espree.tokenize("a");
assert.deepStrictEqual(tester.getRaw(tokens), [{ type: "Identifier", value: "a" }]);
});
it("should not remove } token followed by a template literal.", () => {
let tokens = espree.tokenize("const obj = {}\n`template${{}}!`", { ecmaVersion: 6 });
assert.deepStrictEqual(
tester.getRaw(tokens),
[
{ type: "Keyword", value: "const" },
{ type: "Identifier", value: "obj" },
{ type: "Punctuator", value: "=" },
{ type: "Punctuator", value: "{" },
{ type: "Punctuator", value: "}" },
{ type: "Template", value: "`template${" },
{ type: "Punctuator", value: "{" },
{ type: "Punctuator", value: "}" },
{ type: "Template", value: "}!`" }
]
);
tokens = espree.tokenize("if (a) { b }\n`template`", { ecmaVersion: 6 });
assert.deepStrictEqual(
tester.getRaw(tokens),
[
{ type: "Keyword", value: "if" },
{ type: "Punctuator", value: "(" },
{ type: "Identifier", value: "a" },
{ type: "Punctuator", value: ")" },
{ type: "Punctuator", value: "{" },
{ type: "Identifier", value: "b" },
{ type: "Punctuator", value: "}" },
{ type: "Template", value: "`template`" }
]
);
});
it("should not mutate config", () => {
espree.tokenize("foo", Object.freeze({ ecmaFeatures: Object.freeze({}) }));
});
/**
* Make sure we tokenize closing curly brace in a block statement at end of file
* @see https://github.com/eslint/espree/issues/403 for more information
*/
it("should produce tokens when } is the last token", () => {
const tokens = espree.tokenize("{}");
assert.deepStrictEqual(
tester.getRaw(tokens),
[
{ type: "Punctuator", value: "{" },
{ type: "Punctuator", value: "}" }
]
);
});
});