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luci-base: cbi.js: add client side translation infrastructure

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Implement the string hash algorithm used by LuCI's translation system in
JavaScript and provide a `_()` translation wrapper function to lookup
messages in the global string table.

Once client side translation loading is activated in a later commit,
JavaScript code can use the same string translation mechanism as server
side Lua code, e.g. `_("Static Routes")` would yield "Statische Routen"
when the German translation is loaded.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2018-10-18 13:48:05 +02:00
parent c916b5ed87
commit ab405edfb6
1 changed files with 51 additions and 0 deletions
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51
modules/luci-base/htdocs/luci-static/resources/cbi.js
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@ -15,6 +15,57 @@ var cbi_d = [];
var cbi_t = [];
var cbi_strings = { path: {}, label: {} };
function sfh(s) {
if (s === null || s.length === 0)
return null;
var hash = (s.length >>> 0),
len = (s.length >>> 2),
off = 0, tmp;
while (len--) {
hash += ((s.charCodeAt(off + 1) << 8) + s.charCodeAt(off)) >>> 0;
tmp = ((((s.charCodeAt(off + 3) << 8) + s.charCodeAt(off + 2)) << 11) ^ hash) >>> 0;
hash = ((hash << 16) ^ tmp) >>> 0;
hash += hash >>> 11;
off += 4;
}
switch ((s.length & 3) >>> 0) {
case 3:
hash += ((s.charCodeAt(off + 1) << 8) + s.charCodeAt(off)) >>> 0;
hash = (hash ^ (hash << 16)) >>> 0;
hash = (hash ^ (s.charCodeAt(off + 2) << 18)) >>> 0;
hash += hash >> 11;
break;
case 2:
hash += ((s.charCodeAt(off + 1) << 8) + s.charCodeAt(off)) >>> 0;
hash = (hash ^ (hash << 11)) >>> 0;
hash += hash >>> 17;
break;
case 1:
hash += s.charCodeAt(off);
hash = (hash ^ (hash << 10)) >>> 0;
hash += hash >>> 1;
break;
}
hash = (hash ^ (hash << 3)) >>> 0;
hash += hash >>> 5;
hash = (hash ^ (hash << 4)) >>> 0;
hash += hash >>> 17;
hash = (hash ^ (hash << 25)) >>> 0;
hash += hash >>> 6;
return (0x100000000 + hash).toString(16).substr(1);
}
function _(s) {
return (window.TR && TR[sfh(s)]) || s;
}
function Int(x) {
return (/^-?\d+$/.test(x) ? +x : NaN);
}