Lua 中栈操作的C API示例

这是《Lua程序设计》中的例子，做个简单记录。

#include <stdio.h>
#include <lua5.2/lua.h>
#include <lua5.2/lauxlib.h>

static void stackDump(lua_State *L){
    int i;
    int top = lua_gettop(L);
    for(i = 1; i <= top; i++){
        int t = lua_type(L, i);
        switch(t){
            case LUA_TSTRING:
                printf("'%s'", lua_tostring(L, i));
                break;
            case LUA_TBOOLEAN:
                printf(lua_toboolean(L, i) ? "true":"false");
                break;
            case LUA_TNUMBER:
                printf("%g", lua_tonumber(L, i));
                break;
            default:
                printf("%s", lua_typename(L, t));
                break;
        }
        printf("  ");
    }
    printf("\n");
}

int main(void){

    lua_State *L = luaL_newstate();

    lua_pushboolean(L, 1);
    lua_pushnumber(L, 10);
    lua_pushnil(L);
    lua_pushstring(L, "vonzhou");

    stackDump(L);    // dump the stack

    lua_pushvalue(L, -4);// push the value of the index to the stack
    stackDump(L);

    lua_replace(L, 3);  // pop a value and replace the index's
    stackDump(L);

    lua_settop(L, 6);   // set the top index, fill 'nil'
    stackDump(L);

    lua_remove(L, -3);   //
    stackDump(L);

    lua_settop(L, -5);
    stackDump(L);

    lua_close(L);
    return 0;
}

运行结果：

简单画个示意图：