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41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-segment-iterator-prototype
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description: Verifies the behavior for the iterators.
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features: [Intl.Segmenter]
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---*/
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const segmenter = new Intl.Segmenter();
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const text = "Hello World, Test 123! Foo Bar. How are you?";
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const iter = segmenter.segment(text);
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assert.sameValue("function", typeof iter.following);
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const tests = [
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["3", 2],
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[true, 0],
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[1.4, 0],
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[{ valueOf() { return 5; } }, 4],
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[text.length - 1, text.length - 2],
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[text.length, text.length - 1],
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];
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for (const [input, index] of tests) {
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assert.sameValue(iter.preceding(input), false);
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assert.sameValue(iter.index, index, String(input));
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}
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assert.throws(RangeError, () => iter.preceding("ABC"));
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assert.throws(RangeError, () => iter.preceding(null));
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assert.throws(RangeError, () => iter.preceding(-3));
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// 1.5.3.3 %SegmentIteratorPrototype%.preceding( [ from ] )
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// 3.b If ... from = 0, throw a RangeError exception.
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assert.throws(RangeError, () => iter.preceding(0));
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// 1.5.3.3 %SegmentIteratorPrototype%.preceding( [ from ] )
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// 3.b If from > iterator.[[SegmentIteratorString]] ... , throw a RangeError exception.
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assert.throws(RangeError, () => iter.preceding(text.length + 1));
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