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

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>

diff --git a/modules/luci-base/htdocs/luci-static/resources/cbi.js b/modules/luci-base/htdocs/luci-static/resources/cbi.js
index c27cc8264ee66d6c9244913ccc248d20c7b992ff..a0c0d355f51140f7289c05adc809cf3f8c0a1607 100644 (file)
--- a/modules/luci-base/htdocs/luci-static/resources/cbi.js
+++ b/modules/luci-base/htdocs/luci-static/resources/cbi.js
@@ -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);
 }