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1 #include <lua.h>
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2 #include <lauxlib.h>
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3 #include "seqlualib.h"
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4
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5 static int seqlua_ipairsaux_raw(lua_State *L) {
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6 lua_Integer i;
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7 luaL_checktype(L, 1, LUA_TTABLE);
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8 i = luaL_checkinteger(L, 2) + 1;
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9 lua_pushinteger(L, i);
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10 lua_rawgeti(L, 1, i); // TODO: Lua 5.3 returns type
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11 return lua_isnil(L, -1) ? 1 : 2;
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12 }
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13
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14 static int seqlua_ipairsaux_index(lua_State *L) {
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15 lua_Integer i = luaL_checkinteger(L, 2) + 1;
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16 lua_pushinteger(L, i);
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17 lua_pushinteger(L, i);
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18 lua_gettable(L, 1); // TODO: Lua 5.3 returns type
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19 return lua_isnil(L, -1) ? 1 : 2;
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20 }
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21
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22 static int seqlua_ipairsaux_call(lua_State *L) {
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23 lua_pushinteger(L, luaL_checkinteger(L, 2) + 1);
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24 lua_insert(L, 1); // integer on stack index 1
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25 lua_settop(L, 2); // function on stack index 2
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26 lua_call(L, 0, LUA_MULTRET);
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27 if (lua_isnoneornil(L, 2)) {
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28 lua_settop(L, 0);
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29 lua_pushnil(L);
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30 return 1;
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31 } else {
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32 return lua_gettop(L);
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33 }
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34 }
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35
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36 static int seqlua_ipairs(lua_State *L) {
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37 if (luaL_getmetafield(L, 1, "__ipairs")) {
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38 lua_pushvalue(L, 1);
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39 lua_call(L, 1, 3);
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40 } else {
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41 int t = lua_type(L, 1);
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42 if (t == LUA_TFUNCTION) {
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43 lua_pushcfunction(L, seqlua_ipairsaux_call);
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44 } else if (luaL_getmetafield(L, 1, "__index")) {
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45 lua_pushcfunction(L, seqlua_ipairsaux_index);
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46 } else {
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47 luaL_checktype(L, 1, LUA_TTABLE);
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48 lua_pushcfunction(L, seqlua_ipairsaux_index);
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49 }
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50 lua_pushvalue(L, 1);
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51 lua_pushinteger(L, 0);
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52 }
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53 return 3;
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54 }
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55
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56 static int seqlua_concat(lua_State *L) {
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57 const char *sep;
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58 size_t seplen;
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59 luaL_Buffer buf;
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60 seqlua_Iterator iter;
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61 sep = luaL_checklstring(L, 1, &seplen);
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62 luaL_checkany(L, 2);
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63 lua_settop(L, 3);
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64 luaL_buffinit(L, &buf);
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65 seqlua_iterloop(L, &iter, 2) {
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66 lua_replace(L, 3);
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67 if (seqlua_itercount(&iter) > 1) luaL_addlstring(&buf, sep, seplen);
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68 luaL_tolstring(L, 3, NULL);
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69 luaL_addvalue(&buf);
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70 }
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71 luaL_pushresult(&buf);
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72 return 1;
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73 }
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74
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75 int luaopen_seqlua(lua_State *L) {
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76 lua_pushcfunction(L, seqlua_ipairs);
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77 lua_setglobal(L, "ipairs");
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78 lua_getglobal(L, "string");
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79 lua_pushcfunction(L, seqlua_concat);
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80 lua_setfield(L, -2, "concat");
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81 return 0;
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82 }
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