atcheck/lsscanner/new_ubuntu/node_modules/truncate-utf8-bytes/test.js

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2019-12-16 18:42:21 +01:00
"use strict";
var test = require("tape");
var truncate = require("./");
var browserTruncate = require("./browser");
function isHighSurrogate(codePoint) {
return codePoint >= 0xd800 && codePoint <= 0xdbff;
}
function repeat(string, times) {
return new Array(times + 1).join(string);
}
function assertLengths(t, string, charLength, byteLength) {
t.equal(string.length, charLength);
t.equal(Buffer.byteLength(string), byteLength);
}
// Test writing files to the fs
//
try {
var blns = require("./vendor/big-list-of-naughty-strings/blns.json");
}
catch (err) {
console.error("Error: Cannot load file './vendor/big-list-of-naughty-strings/blns.json'");
console.error();
console.error("Make sure you've initialized git submodules by running");
console.error();
console.error(" git submodule update --init");
console.error();
process.exit(1);
}
// Run tests against both implementations
[truncate, browserTruncate].forEach(function(truncate) {
test("strings", function(t) {
assertLengths(t, truncate("a☃", 2), 1, 1);
assertLengths(t, truncate(repeat("a", 250) + '\uD800\uDC00', 255), 252, 254);
assertLengths(t, truncate(repeat("a", 251) + '\uD800\uDC00', 255), 253, 255);
assertLengths(t, truncate(repeat("a", 252) + '\uD800\uDC00', 255), 252, 252);
assertLengths(t, truncate(repeat("a", 253) + '\uD800\uDC00', 255), 253, 253);
assertLengths(t, truncate(repeat("a", 254) + '\uD800\uDC00', 255), 254, 254);
assertLengths(t, truncate(repeat("a", 255) + '\uD800\uDC00', 255), 255, 255);
t.end();
});
// Truncate various strings
[].concat(
[
repeat("a", 300),
repeat("a", 252) + '\uD800\uDC00',
repeat("a", 251) + '\uD800\uDC00',
repeat("a", 253) + '\uD800\uDC00',
],
blns
).forEach(function(str) {
test(JSON.stringify(str), function(t) {
var i = 0;
t.equals(truncate(str, 0), "");
// Truncate string one byte at a time
while (true) {
var truncated = truncate(str, i);
t.ok(Buffer.byteLength(truncated) <= i);
t.ok( ! isHighSurrogate(truncated[truncated.length - 1]));
if (truncated === str) {
break;
}
i += 1;
}
t.end();
});
});
});