v8/test/mjsunit/str-to-num.js

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function toNumber(val) {
  return Number(val);
}

function repeat(s, num) {
  var result = '';
  while (num > 0) {
    if ((num & 1) != 0) result += s;
    s += s;
    num >>= 1;
  }

  return result;
}

assertEquals('0000000000', repeat('0', 10));

// assertEquals(, toNumber());

assertEquals(123, toNumber(" 123"));
assertEquals(123, toNumber("\n123"));
assertEquals(123, toNumber("\r123"));
assertEquals(123, toNumber("\t123"));
assertEquals(123, toNumber("\f123"));

assertEquals(123, toNumber("123 "));
assertEquals(123, toNumber("123\n"));
assertEquals(123, toNumber("123\r"));
assertEquals(123, toNumber("123\t"));
assertEquals(123, toNumber("123\f"));

assertEquals(123, toNumber(" 123 "));
assertEquals(123, toNumber("\n123\n"));
assertEquals(123, toNumber("\r123\r"));
assertEquals(123, toNumber("\t123\t"));
assertEquals(123, toNumber("\f123\f"));

assertEquals(16, toNumber(" 0x10 "));
assertEquals(NaN, toNumber("0x"));
assertEquals(NaN, toNumber("0x "));

assertTrue(isNaN(toNumber(" NaN ")));
assertEquals(Infinity,  toNumber(" Infinity ") ," Infinity");
assertEquals(-Infinity, toNumber(" -Infinity "));
assertEquals(Infinity,  toNumber(" +Infinity "), " +Infinity");
assertEquals(Infinity,  toNumber("Infinity ") ,"Infinity");
assertEquals(-Infinity, toNumber("-Infinity "));
assertEquals(Infinity,  toNumber("+Infinity "), "+Infinity");

assertEquals(0,  toNumber("0"));
assertEquals(0,  toNumber("+0"));
assertEquals(-0, toNumber("-0"));
assertEquals(-Infinity, 1 / toNumber("-0"));

assertEquals(1,  toNumber("1"));
assertEquals(1,  toNumber("+1"));
assertEquals(-1, toNumber("-1"));

assertEquals(2,  toNumber("2"));
assertEquals(2,  toNumber("+2"));
assertEquals(-2, toNumber("-2"));

assertEquals(3.1415926,  toNumber("3.1415926"));
assertEquals(3.1415926,  toNumber("+3.1415926"));
assertEquals(-3.1415926, toNumber("-3.1415926"));

assertEquals(5,  toNumber("5."));
assertEquals(5,  toNumber("+5."));
assertEquals(-5, toNumber("-5."));

assertEquals(500,   toNumber("5e2"));
assertEquals(500,   toNumber("+5e2"));
assertEquals(-500,  toNumber("-5e2"));
assertEquals(500,   toNumber("5e+2"));
assertEquals(500,   toNumber("+5e+2"));
assertEquals(-500,  toNumber("-5e+2"));
assertEquals(0.05,  toNumber("5e-2"));
assertEquals(0.05,  toNumber("+5e-2"));
assertEquals(-0.05, toNumber("-5e-2"));

assertEquals(0.00001,   toNumber(".00001"));
assertEquals(0.00001,   toNumber("+.00001"));
assertEquals(-0.00001,  toNumber("-.00001"));
assertEquals(1,         toNumber(".00001e5"));
assertEquals(1,         toNumber("+.00001e5"));
assertEquals(-1,        toNumber("-.00001e5"));
assertEquals(1,         toNumber(".00001e+5"));
assertEquals(1,         toNumber("+.00001e+5"));
assertEquals(-1,        toNumber("-.00001e+5"));
assertEquals(0.00001,   toNumber(".001e-2"));
assertEquals(0.00001,   toNumber("+.001e-2"));
assertEquals(-0.00001,  toNumber("-.001e-2"));

assertEquals(12340000,   toNumber("1234e4"));
assertEquals(12340000,   toNumber("+1234e4"));
assertEquals(-12340000,  toNumber("-1234e4"));
assertEquals(12340000,   toNumber("1234e+4"));
assertEquals(12340000,   toNumber("+1234e+4"));
assertEquals(-12340000,  toNumber("-1234e+4"));
assertEquals(0.1234,     toNumber("1234e-4"));
assertEquals(0.1234,     toNumber("+1234e-4"));
assertEquals(-0.1234,    toNumber("-1234e-4"));

assertEquals(0,  toNumber("0x0"));
assertEquals(1,  toNumber("0x1"));
assertEquals(2,  toNumber("0x2"));
assertEquals(9,  toNumber("0x9"));
assertEquals(10, toNumber("0xa"));
assertEquals(11, toNumber("0xb"));
assertEquals(15, toNumber("0xf"));
assertEquals(10, toNumber("0xA"));
assertEquals(11, toNumber("0xB"));
assertEquals(15, toNumber("0xF"));

assertEquals(0,  toNumber("0X0"));
assertEquals(9,  toNumber("0X9"));
assertEquals(10, toNumber("0Xa"));
assertEquals(10, toNumber("0XA"));
assertEquals(15, toNumber("0Xf"));
assertEquals(15, toNumber("0XF"));

assertEquals(0,  toNumber("0x000"));
assertEquals(0,  toNumber("0x000" + repeat('0', 1000)));
assertEquals(9,  toNumber("0x009"));
assertEquals(10, toNumber("0x00a"));
assertEquals(10, toNumber("0x00A"));
assertEquals(15, toNumber("0x00f"));
assertEquals(15, toNumber("0x00F"));
assertEquals(15, toNumber("0x00F "));
assertEquals(Infinity,  toNumber("0x" + repeat('0', 1000) + '1'
                        + repeat('0', 1000)));

assertEquals(0x1000000 * 0x10000000, toNumber("0x10000000000000"));
assertEquals(0x1000000 * 0x10000000 + 1, toNumber("0x10000000000001"));
assertEquals(0x10 * 0x1000000 * 0x10000000, toNumber("0x100000000000000"));
assertEquals(0x10 * 0x1000000 * 0x10000000, toNumber("0x100000000000001"));
assertEquals(0x10 * 0x1000000 * 0x10000000, toNumber("0x100000000000007"));
assertEquals(0x10 * 0x1000000 * 0x10000000, toNumber("0x100000000000008"));
assertEquals(0x10 * (0x1000000 * 0x10000000 + 1),
             toNumber("0x100000000000009"));
assertEquals(0x10 * (0x1000000 * 0x10000000 + 1),
             toNumber("0x10000000000000F"));
assertEquals(0x10 * (0x1000000 * 0x10000000 + 1),
             toNumber("0x100000000000010"));
assertEquals(0x100000000000 * 0x1000000 * 0x10000000,
             toNumber("0x1000000000000000000000000"));
assertEquals(0x100000000000 * 0x1000000 * 0x10000000,
             toNumber("0x1000000000000080000000000"));
assertEquals(0x100000000000 * (0x1000000 * 0x10000000 + 1),
             toNumber("0x1000000000000080000000001"));
assertEquals(0x100000000000 * 0x1000000 * 0x10000000,
             toNumber("  0x1000000000000000000000000  "));

assertEquals(0, toNumber("00"));
assertEquals(1, toNumber("01"));
assertEquals(2, toNumber("02"));
assertEquals(10, toNumber("010"));
assertEquals(100, toNumber("0100"));
assertEquals(100, toNumber("000100"));

assertEquals(Infinity,  toNumber("1e999"), "1e999");
assertEquals(-Infinity, toNumber("-1e999"));
assertEquals(0,         toNumber("1e-999"));
assertEquals(-0,        toNumber("-1e-999"));
assertEquals(Infinity,  1 / toNumber("1e-999"), "1e-999");
assertEquals(-Infinity, 1 / toNumber("-1e-999"));

assertTrue(isNaN(toNumber("junk")), "junk");
assertTrue(isNaN(toNumber("100 junk")), "100 junk");
assertTrue(isNaN(toNumber("0x100 junk")), "0x100 junk");
assertTrue(isNaN(toNumber("100.0 junk")), "100.0 junk");
assertTrue(isNaN(toNumber(".1e4 junk")), ".1e4 junk");
assertTrue(isNaN(toNumber("Infinity junk")), "Infinity junk");
assertTrue(isNaN(toNumber("1e")), "1e");
assertTrue(isNaN(toNumber("1e ")), "1e_");
assertTrue(isNaN(toNumber("1" + repeat('0', 1000) + 'junk')), "1e1000 junk");

for (var i = 1; i < 12; i++) {
  assertEquals(toNumber('1' + repeat('0', i)), Math.pow(10.0, i));
}

assertTrue(isNaN(toNumber("+0x0")));
assertTrue(isNaN(toNumber("+0xFF")));
assertTrue(isNaN(toNumber("+0x012")));
assertTrue(isNaN(toNumber("-0x0")));
assertTrue(isNaN(toNumber("-0xFF")));
assertTrue(isNaN(toNumber("-0x012")));