surrogate-pair-split.js

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// |reftest| skip-if(!this.hasOwnProperty('Intl')||!this.Intl.Segmenter)

// Calling %Segments.prototype%.containing in the middle of a surrogate pair

// doubles back to the lead surrogate.

// Grapheme

  let segmenter = new Intl.Segmenter(undefined, {granularity: "grapheme"});

  let string = "\u{1F925}";

  let segments = segmenter.segment(string);

  let data1 = segments.containing(0);

  let data2 = segments.containing(1);

  let data3 = segments.containing(2);

  assertEq(data1.segment, string);

  assertDeepEq(data1, data2);

  assertEq(data3, undefined);

// Word

  let segmenter = new Intl.Segmenter(undefined, {granularity: "word"});

  let prefix = "Nothing to see here! ";

  let string = "\u{1F925}";

  let segments = segmenter.segment(prefix + string);

  let data1 = segments.containing(prefix.length + 0);

  let data2 = segments.containing(prefix.length + 1);

  let data3 = segments.containing(prefix.length + 2);

  assertEq(data1.segment, string);

  assertDeepEq(data1, data2);

  assertEq(data3, undefined);

// Sentence

  let segmenter = new Intl.Segmenter(undefined, {granularity: "sentence"});

  let prefix = "Nothing to see here! Please disperse. ";

  let string = "\u{1F925}";

  let segments = segmenter.segment(prefix + string);

  let data1 = segments.containing(prefix.length + 0);

  let data2 = segments.containing(prefix.length + 1);

  let data3 = segments.containing(prefix.length + 2);

  assertEq(data1.segment, string);

  assertDeepEq(data1, data2);

  assertEq(data3, undefined);

if (typeof reportCompare === "function")

  reportCompare(0, 0);