tor-browser

string-tolowercase-latin1.js (2096B)

---

// Test inline lower case conversion of ASCII / Latin-1 strings.

function* characters(...ranges) {
 for (let [start, end] of ranges) {
   for (let i = start; i <= end; ++i) {
     yield i;
   }
 }
}

const ascii_upper = [...characters(
 [0x41, 0x5A], // A..Z
 [0x30, 0x39], // 0..9
)];

const ascii_lower = [...characters(
 [0x61, 0x7A], // a..z
 [0x30, 0x39], // 0..9
)];

const latin1_upper = [...characters(
 [0xC0, 0xDE], // À..Þ
 [0x30, 0x39], // 0..9
)];

const latin1_lower = [...characters(
 [0xDF, 0xFF], // ß..ÿ
)];

for (let upper of [ascii_upper, latin1_upper]) {
 let s = String.fromCodePoint(...upper);
 assertEq(isLatin1(s), true);
 assertEq(s, s.toUpperCase());
}

for (let lower of [ascii_lower, latin1_lower]) {
 let s = String.fromCodePoint(...lower);
 assertEq(isLatin1(s), true);
 assertEq(s, s.toLowerCase());
}

function toRope(s) {
 try {
   return newRope(s[0], s.substring(1));
 } catch {}
 // newRope can fail when |s| fits into an inline string. In that case simply
 // return the input.
 return s;
}

for (let i = 0; i <= 32; ++i) {
 let strings = [ascii_upper, ascii_lower, latin1_upper, latin1_lower].flatMap(codePoints => [
   String.fromCodePoint(...codePoints.slice(0, i)),

   // Trailing ASCII upper case character.
   String.fromCodePoint(...codePoints.slice(0, i)) + "A",

   // Trailing ASCII lower case character.
   String.fromCodePoint(...codePoints.slice(0, i)) + "a",

   // Trailing Latin-1 upper case character.
   String.fromCodePoint(...codePoints.slice(0, i)) + "À",

   // Trailing Latin-1 lower case character.
   String.fromCodePoint(...codePoints.slice(0, i)) + "ß",
 ]).flatMap(x => [
   x,
   toRope(x),
   newString(x, {twoByte: true}),
 ]);

 const expected = strings.map(x => {
   // Prevent Warp compilation when computing the expected results.
   with ({}) ;
   return x.toLowerCase();
 });

 for (let i = 0; i < 1000; ++i) {
   let idx = i % strings.length;
   let str = strings[idx];

   let actual = str.toLowerCase();
   if (actual !== expected[idx]) throw new Error();
 }
}