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authordaurnimator <quae@daurnimator.com>2017-04-26 23:42:18 +1000
committerdaurnimator <quae@daurnimator.com>2017-04-26 23:56:52 +1000
commit2c6ad8ae871ec8f511f1b983867fccf031bf38b3 (patch)
treeeacefbe085e0e551e4460046bd474395fcc74a32 /src/defs.js
parenta70eeebe4aa5014e08b67da7ec07be903c3cf6a5 (diff)
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Move jsstring() from lobject.js to defs.js; export from lua.js
Diffstat (limited to 'src/defs.js')
-rw-r--r--src/defs.js45
1 files changed, 45 insertions, 0 deletions
diff --git a/src/defs.js b/src/defs.js
index fd8038a..34316e9 100644
--- a/src/defs.js
+++ b/src/defs.js
@@ -134,6 +134,50 @@ class lua_Debug {
}
+const to_jsstring = function(value, from, to) {
+ assert(Array.isArray(value), "jsstring expect a array of bytes");
+
+ let u0, u1, u2, u3, u4, u5;
+ let idx = 0;
+ value = value.slice(from ? from : 0, to);
+
+ var str = '';
+ while (1) {
+ // For UTF8 byte structure, see http://en.wikipedia.org/wiki/UTF-8#Description and https://www.ietf.org/rfc/rfc2279.txt and https://tools.ietf.org/html/rfc3629
+ u0 = value[idx++];
+ if (u0 === 0) { str += "\0"; continue; } // Lua string embed '\0'
+ if (!u0) return str;
+ if (!(u0 & 0x80)) { str += String.fromCharCode(u0); continue; }
+ u1 = value[idx++] & 63;
+ if ((u0 & 0xE0) == 0xC0) { str += String.fromCharCode(((u0 & 31) << 6) | u1); continue; }
+ u2 = value[idx++] & 63;
+ if ((u0 & 0xF0) == 0xE0) {
+ u0 = ((u0 & 15) << 12) | (u1 << 6) | u2;
+ } else {
+ u3 = value[idx++] & 63;
+ if ((u0 & 0xF8) == 0xF0) {
+ u0 = ((u0 & 7) << 18) | (u1 << 12) | (u2 << 6) | u3;
+ } else {
+ u4 = value[idx++] & 63;
+ if ((u0 & 0xFC) == 0xF8) {
+ u0 = ((u0 & 3) << 24) | (u1 << 18) | (u2 << 12) | (u3 << 6) | u4;
+ } else {
+ u5 = value[idx++] & 63;
+ u0 = ((u0 & 1) << 30) | (u1 << 24) | (u2 << 18) | (u3 << 12) | (u4 << 6) | u5;
+ }
+ }
+ }
+ if (u0 < 0x10000) {
+ str += String.fromCharCode(u0);
+ } else {
+ var ch = u0 - 0x10000;
+ str += String.fromCharCode(0xD800 | (ch >> 10), 0xDC00 | (ch & 0x3FF));
+ }
+ }
+
+ return str;
+};
+
const to_luastring_cache = {};
const to_luastring = function(str, cache, maxBytesToWrite) {
@@ -277,4 +321,5 @@ module.exports.constant_types = constant_types;
module.exports.lua_Debug = lua_Debug;
module.exports.lua_upvalueindex = lua_upvalueindex;
module.exports.thread_status = thread_status;
+module.exports.to_jsstring = to_jsstring;
module.exports.to_luastring = to_luastring;