// Copyright 2017 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: >
  Named groups in Unicode RegExps have some syntax errors and some
  compatibility escape fallback behavior.
esid: prod-GroupSpecifier
features: [regexp-named-groups]
includes: [compareArray.js]
---*/

assert.throws(SyntaxError, () => eval("/(?<>a)/"));
assert.throws(SyntaxError, () => eval("/(?<aa)/"));
assert.throws(SyntaxError, () => eval("/(?<42a>a)/"));
assert.throws(SyntaxError, () => eval("/(?<:a>a)/"));
assert.throws(SyntaxError, () => eval("/(?<a:>a)/"));
assert.throws(SyntaxError, () => eval("/(?<a>a)(?<a>a)/"));
assert.throws(SyntaxError, () => eval("/(?<a>a)(?<b>b)(?<a>a)/"));

assert.throws(SyntaxError, () => eval("/(?<a>.)\\k/"));
assert.throws(SyntaxError, () => eval("/(?<a>.)\\k<a/"));
assert.throws(SyntaxError, () => eval("/(?<a>.)\\k<>/"));
assert.throws(SyntaxError, () => eval("/(?<a>.)\\k<b>/"));
assert.throws(SyntaxError, () => eval("/(?<a>a)\\k<ab>/"));
assert.throws(SyntaxError, () => eval("/(?<ab>a)\\k<a>/"));
assert.throws(SyntaxError, () => eval("/\\k<a>(?<ab>a)/"));
assert.throws(SyntaxError, () => eval("/\\k<a(?<a>a)/"));

// A couple of corner cases around '\k' as named back-references vs. identity
// escapes.
assert(/\k<a>(?<a>x)/.test("x"));
assert.throws(SyntaxError, () => eval("/\\k<a>(?<b>x)/"));
assert.throws(SyntaxError, () => eval("/\\k<a(?<a>.)/"));
assert.throws(SyntaxError, () => eval("/\\k(?<a>.)/"));