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-rw-r--r--src/lobject.js15
-rw-r--r--src/lstrlib.js4
2 files changed, 11 insertions, 8 deletions
diff --git a/src/lobject.js b/src/lobject.js
index c2950b6..d713183 100644
--- a/src/lobject.js
+++ b/src/lobject.js
@@ -118,31 +118,32 @@ class TValue {
return this.ttisnil() || (this.ttisboolean() && this.value === false);
}
- jsstring() {
+ jsstring(from, to) {
let u0, u1, u2, u3, u4, u5;
let idx = 0;
+ let value = this.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 = this.value[idx++];
+ u0 = value[idx++];
if (!u0) return str;
if (!(u0 & 0x80)) { str += String.fromCharCode(u0); continue; }
- u1 = this.value[idx++] & 63;
+ u1 = value[idx++] & 63;
if ((u0 & 0xE0) == 0xC0) { str += String.fromCharCode(((u0 & 31) << 6) | u1); continue; }
- u2 = this.value[idx++] & 63;
+ u2 = value[idx++] & 63;
if ((u0 & 0xF0) == 0xE0) {
u0 = ((u0 & 15) << 12) | (u1 << 6) | u2;
} else {
- u3 = this.value[idx++] & 63;
+ u3 = value[idx++] & 63;
if ((u0 & 0xF8) == 0xF0) {
u0 = ((u0 & 7) << 18) | (u1 << 12) | (u2 << 6) | u3;
} else {
- u4 = this.value[idx++] & 63;
+ u4 = value[idx++] & 63;
if ((u0 & 0xFC) == 0xF8) {
u0 = ((u0 & 3) << 24) | (u1 << 18) | (u2 << 12) | (u3 << 6) | u4;
} else {
- u5 = this.value[idx++] & 63;
+ u5 = value[idx++] & 63;
u0 = ((u0 & 1) << 30) | (u1 << 24) | (u2 << 18) | (u3 << 12) | (u4 << 6) | u5;
}
}
diff --git a/src/lstrlib.js b/src/lstrlib.js
index c6c0dc3..1b62db1 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -33,13 +33,15 @@ const posrelat = function(pos, len) {
const str_sub = function(L) {
let s = lauxlib.luaL_checkstring(L, 1);
+ let ts = L.stack[lapi.index2addr_(L, 1)];
+ s = ts.value;
let l = s.length;
let start = posrelat(lauxlib.luaL_checkinteger(L, 2), l);
let end = posrelat(lauxlib.luaL_optinteger(L, 3, -1), l);
if (start < 1) start = 1;
if (end > l) end = l;
if (start <= end)
- lapi.lua_pushstring(L, s.slice(start - 1, (start - 1) + (end - start + 1)));
+ lapi.lua_pushstring(L, ts.jsstring(start - 1, (start - 1) + (end - start + 1)));
else lapi.lua_pushliteral(L, "");
return 1;
};