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authorBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-02-23 08:59:35 +0100
committerBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-02-23 10:40:04 +0100
commit567e12ce3f1ef413afa510cb583d6ac8442a7a4a (patch)
treea1911e7291e917de549bbdd2dead60aa513af87f /src/lcorolib.js
parent7c459409b078e38da07e2570a77945fdc0f55c2c (diff)
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coroutines
Diffstat (limited to 'src/lcorolib.js')
-rw-r--r--src/lcorolib.js86
1 files changed, 86 insertions, 0 deletions
diff --git a/src/lcorolib.js b/src/lcorolib.js
new file mode 100644
index 0000000..73699a7
--- /dev/null
+++ b/src/lcorolib.js
@@ -0,0 +1,86 @@
+/* jshint esversion: 6 */
+"use strict";
+
+const assert = require('assert');
+
+const lua = require('./lua.js');
+const lapi = require('./lapi.js');
+const lauxlib = require('./lauxlib.js');
+const lstate = require('./lstate.js');
+const ldo = require('./ldo.js');
+const CT = lua.constant_types;
+const TS = lua.thread_status;
+
+const getco = function(L) {
+ let co = lapi.lua_tothread(L, 1);
+ lauxlib.luaL_argcheck(L, co, 1, "thread expected");
+ return co;
+};
+
+const auxresume = function(L, co, narg) {
+ if (!lapi.lua_checkstack(co, narg)) {
+ lapi.lua_pushliteral(L, "too many arguments to resume");
+ return -1; /* error flag */
+ }
+
+ if (lapi.lua_status(co) === TS.LUA_OK && lapi.lua_gettop(co) === 0) {
+ lapi.lua_pushliteral(L, "cannot resume dead coroutine");
+ return -1; /* error flag */
+ }
+
+ lapi.lua_xmove(L, co, narg);
+ let status = ldo.lua_resume(co, L, narg);
+ if (status === TS.LUA_OK || status === TS.LUA_YIELD) {
+ let nres = lapi.lua_gettop(L);
+ if (!lapi.lua_checkstack(L, nres + 1)) {
+ lapi.lua_pop(co, nres); /* remove results anyway */
+ lapi.lua_pushliteral(L, "too many results to resume");
+ return -1; /* error flag */
+ }
+
+ lapi.lua_xmove(co, L, nres); /* move yielded values */
+ return nres;
+ } else {
+ lapi.lua_xmove(co, L, 1); /* move error message */
+ return -1; /* error flag */
+ }
+};
+
+const luaB_resume = function(L) {
+ let co = getco(L);
+ let r = auxresume(L, co, lapi.lua_gettop(L) - 1);
+ if (r < 0) {
+ lapi.lua_pushboolean(L, 0);
+ lapi.lua_insert(L, -2);
+ return 2; /* return false + error message */
+ } else {
+ lapi.lua_pushboolean(L, 1);
+ lapi.lua_insert(L, -(r + 1));
+ return r + 1; /* return true + 'resume' returns */
+ }
+};
+
+const luaB_cocreate = function(L) {
+ lauxlib.luaL_checktype(L, 1, CT.LUA_TFUNCTION);
+ let NL = lstate.lua_newthread(L);
+ lapi.lua_pushvalue(L, 1); /* move function to top */
+ lapi.lua_xmove(L, NL, 1); /* move function from L to NL */
+ return 1;
+};
+
+const luaB_yield = function(L) {
+ return ldo.lua_yield(L, lapi.lua_gettop(L));
+};
+
+const co_funcs = {
+ "create": luaB_cocreate,
+ "yield": luaB_yield,
+ "resume": luaB_resume
+};
+
+const luaopen_coroutine = function(L) {
+ lauxlib.luaL_newlib(L, co_funcs);
+ return 1;
+};
+
+module.exports.luaopen_coroutine = luaopen_coroutine; \ No newline at end of file