v8/test/mjsunit/string-case.js

// Copyright 2008 the V8 project authors. All rights reserved.
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// Flags: --allow-natives-syntax --expose-externalize-string

assertEquals("ΚΟΣΜΟΣ ΚΟΣΜΟΣ".toLowerCase(), "κοσμος κοσμος");

var A_CODE = "A".charCodeAt(0);
var Z_CODE = "Z".charCodeAt(0);
var a_CODE = "a".charCodeAt(0);
var z_CODE = "z".charCodeAt(0);

function charCodeToLower(charCode) {
  if (A_CODE <= charCode && charCode <= Z_CODE) {
    return charCode + a_CODE - A_CODE;
  }
  return charCode;
}

function charCodeToUpper(charCode) {
  if (a_CODE <= charCode && charCode <= z_CODE) {
    return charCode - (a_CODE - A_CODE);
  }
  return charCode;
}

function test(length) {
  var str = "";
  var strLower = "";
  var strUpper = "";
  for (var i = 0; i < length; i++) {
    var c = Math.round(0x7f * Math.random());
    str += String.fromCharCode(c);
    strLower += String.fromCharCode(charCodeToLower(c));
    strUpper += String.fromCharCode(charCodeToUpper(c));
  }
  str = %FlattenString(str);
  strLower = %FlattenString(strLower);
  strUpper = %FlattenString(strUpper);
  // Sequential string.
  assertEquals(strLower, str.toLowerCase());
  assertEquals(strUpper, str.toUpperCase());
  // Cons string.
  assertEquals(strLower + strLower, (str + str).toLowerCase());
  assertEquals(strUpper + strUpper, (str + str).toUpperCase());
  // Sliced string.
  assertEquals(strLower.substring(1), str.substring(1).toLowerCase());
  assertEquals(strUpper.substring(1), str.substring(1).toUpperCase());
  // External string.
  externalizeString(str, false);
  assertEquals(strLower, str.toLowerCase());
  assertEquals(strUpper, str.toUpperCase());
}

for (var i = 1; i <= 128; i <<= 1); {
  for (var j = 0; j < 8; j++) {
    for (var k = 0; k < 3; k++) {
      test(i + j);
    }
  }
}