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authorBenoit Giannangeli <giann008@gmail.com>2017-03-05 15:57:04 +0100
committerBenoit Giannangeli <giann008@gmail.com>2017-03-05 15:57:04 +0100
commit2ac8543dfd87f4c227385d6890bfcb011fc341f1 (patch)
treee122a3d4c28406aadeba2557f76bb123a34025ef /src/lstrlib.js
parentdb136649e45a63edb8bc511e756249a9e6ca9ea7 (diff)
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lstrlib, string.len
Diffstat (limited to 'src/lstrlib.js')
-rw-r--r--src/lstrlib.js36
1 files changed, 36 insertions, 0 deletions
diff --git a/src/lstrlib.js b/src/lstrlib.js
new file mode 100644
index 0000000..194d6ba
--- /dev/null
+++ b/src/lstrlib.js
@@ -0,0 +1,36 @@
+"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;
+}; \ No newline at end of file