1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
"use strict";
const assert = require('assert');
const lua = require('./lua.js');
const lapi = require('./lapi.js');
const lauxlib = require('./lauxlib.js');
const CT = lua.constant_types;
const TS = lua.thread_status;
const str_len = function(L) {
lauxlib.luaL_checkstring(L, 1);
lapi.lua_pushinteger(L, lapi.lua_tostring(L, 1).length);
return 1;
};
const strlib = {
"len": str_len
};
const createmetatable = function(L) {
lapi.lua_createtable(L, 0, 1); /* table to be metatable for strings */
lapi.lua_pushliteral(L, ""); /* dummy string */
lapi.lua_pushvalue(L, -2); /* copy table */
lapi.lua_setmetatable(L, -2); /* set table as metatable for strings */
lapi.lua_pop(L, 1); /* pop dummy string */
lapi.lua_pushvalue(L, -2); /* get string library */
lapi.lua_setfield(L, -2, "__index"); /* metatable.__index = string */
lapi.lua_pop(L, 1); /* pop metatable */
};
const luaopen_string = function(L) {
lauxlib.luaL_newlib(L, strlib);
createmetatable(L);
return 1;
};
|
