seqlua
view seqlua.c @ 53:664736a8fcbf
Included mode argument for seqlua_iterloop in README
| author | jbe |
|---|---|
| date | Tue Aug 26 23:53:29 2014 +0200 (2014-08-26) |
| parents | 3362ec36cb09 |
| children | 92ce3958aca7 |
line source
1 #include <lua.h>
2 #include <lauxlib.h>
3 #include "seqlualib.h"
4 #include <string.h>
6 static int seqlua_ipairsaux_raw(lua_State *L) {
7 lua_Integer i;
8 luaL_checktype(L, 1, LUA_TTABLE);
9 i = luaL_checkinteger(L, 2) + 1;
10 lua_pushinteger(L, i);
11 lua_rawgeti(L, 1, i); // TODO: Lua 5.3 returns type
12 return lua_isnil(L, -1) ? 1 : 2;
13 }
15 static int seqlua_ipairsaux_index(lua_State *L) {
16 lua_Integer i = luaL_checkinteger(L, 2) + 1;
17 lua_pushinteger(L, i);
18 lua_pushinteger(L, i);
19 lua_gettable(L, 1); // TODO: Lua 5.3 returns type
20 return lua_isnil(L, -1) ? 1 : 2;
21 }
23 static int seqlua_ipairsaux_call(lua_State *L) {
24 lua_pushinteger(L, luaL_checkinteger(L, 2) + 1);
25 lua_insert(L, 1); // integer on stack index 1
26 lua_settop(L, 2); // function on stack index 2
27 lua_call(L, 0, LUA_MULTRET);
28 if (lua_isnoneornil(L, 2)) {
29 lua_settop(L, 0);
30 lua_pushnil(L);
31 return 1;
32 } else {
33 return lua_gettop(L);
34 }
35 }
37 static int seqlua_ipairs(lua_State *L) {
38 const char *method;
39 int generated = 0;
40 seqlua_ipairs_repeat:
41 if (luaL_getmetafield(L, 1, "__ipairs")) {
42 lua_pushvalue(L, 1);
43 lua_call(L, 1, 3);
44 if (lua_type(L, -3) == LUA_TSTRING) {
45 const char *method = lua_tostring(L, -3);
46 if (!strcmp(method, "raw")) {
47 lua_pushcfunction(L, seqlua_ipairsaux_raw);
48 } else if (!strcmp(method, "index")) {
49 lua_pushcfunction(L, seqlua_ipairsaux_index);
50 } else if (!strcmp(method, "call")) {
51 lua_pushcfunction(L, seqlua_ipairsaux_call);
52 } else {
53 luaL_error(L, "Unexpected string returned by __ipairs metamethod");
54 }
55 lua_pushvalue(L, -3);
56 lua_pushinteger(L, 0);
57 }
58 } else {
59 int t = lua_type(L, 1);
60 if (t == LUA_TFUNCTION) {
61 if (generated) goto seqlua_ipairs_call;
62 method = lua_tostring(L, 2);
63 if (method) {
64 if (!strcmp(method, "call")) {
65 seqlua_ipairs_call:
66 lua_pushcfunction(L, seqlua_ipairsaux_call);
67 goto seqlua_ipairs_finish;
68 } else if (!strcmp(method, "generator")) {
69 lua_settop(L, 1);
70 lua_call(L, 0, 1);
71 generated = 1;
72 goto seqlua_ipairs_repeat;
73 }
74 }
75 } else if (luaL_getmetafield(L, 1, "__index")) {
76 lua_pushcfunction(L, seqlua_ipairsaux_index);
77 goto seqlua_ipairs_finish;
78 }
79 luaL_checktype(L, 1, LUA_TTABLE);
80 lua_pushcfunction(L, seqlua_ipairsaux_raw);
81 seqlua_ipairs_finish:
82 lua_pushvalue(L, 1);
83 lua_pushinteger(L, 0);
84 }
85 return 3;
86 }
88 static int seqlua_concat(lua_State *L) {
89 const char *sep;
90 size_t seplen;
91 luaL_Buffer buf;
92 seqlua_Iterator iter;
93 sep = luaL_checklstring(L, 1, &seplen);
94 luaL_checkany(L, 2);
95 lua_settop(L, 3);
96 luaL_buffinit(L, &buf);
97 seqlua_iterloop(L, &iter, SEQLUA_MODE_CALL, 2) {
98 lua_replace(L, 3);
99 if (seqlua_itercount(&iter) > 1) luaL_addlstring(&buf, sep, seplen);
100 luaL_tolstring(L, 3, NULL);
101 luaL_addvalue(&buf);
102 }
103 luaL_pushresult(&buf);
104 return 1;
105 }
107 int luaopen_seqlua(lua_State *L) {
108 lua_pushcfunction(L, seqlua_ipairs);
109 lua_setglobal(L, "ipairs");
110 lua_getglobal(L, "string");
111 lua_pushcfunction(L, seqlua_concat);
112 lua_setfield(L, -2, "concat");
113 return 0;
114 }