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utils.cpp
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utils.cpp
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#include <iostream>
#include <client/dbclient.h>
extern "C" {
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#if !defined(LUA_VERSION_NUM) || (LUA_VERSION_NUM < 501)
#include <compat-5.1.h>
#endif
};
#include "utils.h"
#include "common.h"
using namespace mongo;
extern void push_bsontype_table(lua_State* L, mongo::BSONType bsontype);
void lua_push_value(lua_State *L, const BSONElement &elem);
const char *bson_name(int type);
static void bson_to_array(lua_State *L, const BSONObj &obj) {
BSONObjIterator it = BSONObjIterator(obj);
lua_newtable(L);
int n = 1;
while (it.more()) {
BSONElement elem = it.next();
lua_push_value(L, elem);
lua_rawseti(L, -2, n++);
}
}
static void bson_to_table(lua_State *L, const BSONObj &obj) {
BSONObjIterator it = BSONObjIterator(obj);
lua_newtable(L);
while (it.more()) {
BSONElement elem = it.next();
const char *key = elem.fieldName();
lua_pushstring(L, key);
lua_push_value(L, elem);
lua_rawset(L, -3);
}
}
void lua_push_value(lua_State *L, const BSONElement &elem) {
int type = elem.type();
switch(type) {
case mongo::Undefined:
case mongo::jstNULL:
lua_pushnil(L);
break;
case mongo::NumberInt:
lua_pushinteger(L, elem.number());
break;
case mongo::NumberDouble:
lua_pushnumber(L, elem.number());
break;
case mongo::Bool:
lua_pushboolean(L, elem.boolean());
break;
case mongo::String:
lua_pushstring(L, elem.valuestr());
break;
case mongo::Array:
bson_to_array(L, elem.embeddedObject());
break;
case mongo::Object:
bson_to_table(L, elem.embeddedObject());
break;
case mongo::Date:
push_bsontype_table(L, mongo::Date);
lua_pushnumber(L, elem.date());
lua_rawseti(L, -2, 1);
break;
case mongo::Timestamp:
push_bsontype_table(L, mongo::Date);
lua_pushnumber(L, elem.timestampTime());
lua_rawseti(L, -2, 1);
break;
case mongo::Symbol:
push_bsontype_table(L, mongo::Symbol);
lua_pushstring(L, elem.valuestr());
lua_rawseti(L, -2, 1);
break;
case mongo::RegEx:
push_bsontype_table(L, mongo::RegEx);
lua_pushstring(L, elem.regex());
lua_rawseti(L, -2, 1);
lua_pushstring(L, elem.regexFlags());
lua_rawseti(L, -2, 2);
break;
case mongo::jstOID:
push_bsontype_table(L, mongo::jstOID);
lua_pushstring(L, elem.__oid().str().c_str());
lua_rawseti(L, -2, 1);
break;
case mongo::EOO:
break;
default:
luaL_error(L, LUAMONGO_UNSUPPORTED_BSON_TYPE, bson_name(type));
}
}
static void lua_append_bson(lua_State *L, const char *key, int stackpos, BSONObjBuilder *builder) {
int type = lua_type(L, stackpos);
if (type == LUA_TTABLE) {
int bsontype_found = luaL_getmetafield(L, stackpos, "__bsontype");
if (!bsontype_found)
{
// not a special bsontype
// handle as a regular table, iterating keys
BSONObjBuilder b;
lua_pushnil(L);
int isarray = 1;
while (lua_next(L, stackpos-1) != 0) {
if (lua_type(L, -2) == LUA_TNUMBER) {
int index = lua_tointeger(L, -2);
stringstream ss;
ss << index-1;
lua_append_bson(L, ss.str().c_str(), -1, &b);
lua_pop(L, 1);
} else {
const char *k = lua_tostring(L, -2);
lua_append_bson(L, k, -1, &b);
lua_pop(L, 1);
isarray = 0;
}
}
if (isarray) {
builder->appendArray(key, b.obj());
} else {
builder->append(key, b.obj());
}
}
else
{
int bson_type = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_rawgeti(L, -1, 1);
switch (bson_type) {
case mongo::Date:
builder->appendDate(key, lua_tonumber(L, -1));
break;
case mongo::Timestamp:
builder->appendTimestamp(key);
break;
case mongo::RegEx: {
const char* regex = lua_tostring(L, -1);
lua_rawgeti(L, -2, 2); // options
const char* options = lua_tostring(L, -1);
lua_pop(L, 1);
builder->appendRegex(key, regex, options);
break;
}
case mongo::NumberInt:
builder->append(key, static_cast<int32_t>(lua_tointeger(L, -1)));
break;
case mongo::Symbol:
builder->appendSymbol(key, lua_tostring(L, -1));
break;
case mongo::jstOID: {
OID oid;
oid.init(lua_tostring(L, -1));
builder->appendOID(key, &oid);
break;
}
default:
luaL_error(L, LUAMONGO_UNSUPPORTED_BSON_TYPE, luaL_typename(L, stackpos));
}
lua_pop(L, 1);
}
} else if (type == LUA_TNIL) {
builder->appendNull(key);
} else if (type == LUA_TNUMBER) {
builder->append(key, lua_tonumber(L, stackpos));
} else if (type == LUA_TBOOLEAN) {
builder->appendBool(key, lua_toboolean(L, stackpos));
} else if (type == LUA_TSTRING) {
builder->append(key, lua_tostring(L, stackpos));
} else {
luaL_error(L, LUAMONGO_UNSUPPORTED_LUA_TYPE, luaL_typename(L, stackpos));
}
}
void bson_to_lua(lua_State *L, const BSONObj &obj) {
if (obj.isEmpty()) {
lua_pushnil(L);
} else {
bson_to_table(L, obj);
}
}
void lua_to_bson(lua_State *L, int stackpos, BSONObj &obj) {
BSONObjBuilder builder;
lua_pushnil(L);
while (lua_next(L, stackpos) != 0) {
const char *k = lua_tostring(L, -2);
lua_append_bson(L, k, -1, &builder);
lua_pop(L, 1);
}
obj = builder.obj();
}
const char *bson_name(int type) {
const char *name;
switch(type) {
case mongo::EOO:
name = "EndOfObject";
break;
case mongo::NumberDouble:
name = "NumberDouble";
break;
case mongo::String:
name = "String";
break;
case mongo::Object:
name = "Object";
break;
case mongo::Array:
name = "Array";
break;
case mongo::BinData:
name = "BinData";
break;
case mongo::Undefined:
name = "Undefined";
break;
case mongo::jstOID:
name = "ObjectID";
break;
case mongo::Bool:
name = "Bool";
break;
case mongo::Date:
name = "Date";
break;
case mongo::jstNULL:
name = "NULL";
break;
case mongo::RegEx:
name = "RegEx";
break;
case mongo::DBRef:
name = "DBRef";
break;
case mongo::Code:
name = "Code";
break;
case mongo::Symbol:
name = "Symbol";
break;
case mongo::CodeWScope:
name = "CodeWScope";
break;
case mongo::NumberInt:
name = "NumberInt";
break;
case mongo::Timestamp:
name = "Timestamp";
break;
case mongo::NumberLong:
name = "NumberLong";
break;
default:
name = "UnknownType";
}
return name;
}