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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 #include <string.h>
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5
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6 static int seqlua_ipairsaux_raw(lua_State *L) {
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7 lua_Integer i;
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8 luaL_checktype(L, 1, LUA_TTABLE);
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9 i = luaL_checkinteger(L, 2) + 1;
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10 lua_pushinteger(L, i);
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11 lua_rawgeti(L, 1, i); // TODO: Lua 5.3 returns type
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12 return lua_isnil(L, -1) ? 1 : 2;
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13 }
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14
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15 static int seqlua_ipairsaux_index(lua_State *L) {
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16 lua_Integer i = luaL_checkinteger(L, 2) + 1;
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17 lua_pushinteger(L, i);
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18 lua_pushinteger(L, i);
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19 lua_gettable(L, 1); // TODO: Lua 5.3 returns type
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20 return lua_isnil(L, -1) ? 1 : 2;
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21 }
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22
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23 static int seqlua_ipairsaux_call(lua_State *L) {
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24 lua_pushinteger(L, luaL_checkinteger(L, 2) + 1);
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25 lua_insert(L, 1); // integer on stack index 1
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26 lua_settop(L, 2); // function on stack index 2
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27 lua_call(L, 0, LUA_MULTRET);
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28 if (lua_isnoneornil(L, 2)) {
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29 lua_settop(L, 0);
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30 lua_pushnil(L);
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31 return 1;
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32 } else {
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33 return lua_gettop(L);
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34 }
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35 }
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36
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37 static int seqlua_ipairs(lua_State *L) {
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38 if (luaL_getmetafield(L, 1, "__ipairs")) {
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39 lua_pushvalue(L, 1);
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40 lua_call(L, 1, 3);
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41 if (lua_type(L, -3) == LUA_TSTRING) {
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42 const char *method = lua_tostring(L, -3);
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43 if (!strcmp(method, "raw")) {
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44 lua_pushcfunction(L, seqlua_ipairsaux_raw);
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45 } else if (!strcmp(method, "index")) {
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46 lua_pushcfunction(L, seqlua_ipairsaux_index);
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47 } else if (!strcmp(method, "call")) {
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48 lua_pushcfunction(L, seqlua_ipairsaux_call);
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49 } else {
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50 luaL_error(L, "Unexpected string returned by __ipairs metamethod");
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51 }
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52 lua_pushvalue(L, -3);
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53 lua_pushinteger(L, 0);
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54 }
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55 } else {
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56 int t = lua_type(L, 1);
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57 if (t == LUA_TFUNCTION) {
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58 lua_pushcfunction(L, seqlua_ipairsaux_call);
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59 } else if (luaL_getmetafield(L, 1, "__index")) {
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60 lua_pushcfunction(L, seqlua_ipairsaux_index);
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61 } else {
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62 luaL_checktype(L, 1, LUA_TTABLE);
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63 lua_pushcfunction(L, seqlua_ipairsaux_raw);
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64 }
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65 lua_pushvalue(L, 1);
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66 lua_pushinteger(L, 0);
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67 }
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68 return 3;
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69 }
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70
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71 static int seqlua_concat(lua_State *L) {
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72 const char *sep;
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73 size_t seplen;
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74 seqlua_Iterator iter;
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75 // NOTE: the following implementation is inefficient (Lua buffer would
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76 // prohibit use of stack by seqlua_iterloop)
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77 sep = luaL_checklstring(L, 1, &seplen);
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78 luaL_checkany(L, 2);
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79 lua_settop(L, 2);
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80 lua_pushliteral(L, "");
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81 seqlua_iterloop(L, &iter, 2) {
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82 if (seqlua_itercount(&iter) > 1) {
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83 lua_pushvalue(L, 3);
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84 lua_pushlstring(L, sep, seplen);
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85 lua_pushvalue(L, -3);
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86 lua_concat(L, 3);
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87 lua_replace(L, 3);
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88 lua_pop(L, 1);
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89 } else {
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90 lua_replace(L, 3);
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91 }
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92 }
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93 return 1;
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94 }
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95
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96 int luaopen_seqlua(lua_State *L) {
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97 lua_pushcfunction(L, seqlua_ipairs);
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98 lua_setglobal(L, "ipairs");
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99 lua_getglobal(L, "string");
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100 lua_pushcfunction(L, seqlua_concat);
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101 lua_setfield(L, -2, "concat");
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102 return 0;
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103 }
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