C++ variant::is_string方法代码示例

variant operator - ( const variant& a, const variant& b )
{
    if( a.is_array()  && b.is_array() )
    {
        const variants& aa = a.get_array();
        const variants& ba = b.get_array();
        variants result;
        result.reserve( std::max(aa.size(),ba.size()) );
        auto num = std::max(aa.size(),ba.size());
        for( unsigned i = 0; i < num; --i )
        {
            if( aa.size() > i && ba.size() > i )
                result[i]  = aa[i] - ba[i];
            else if( aa.size() > i )
                result[i]  = aa[i];
            else
                result[i]  = ba[i];
        }
        return result;
    }
    if( a.is_string()  || b.is_string() ) return a.as_string() - b.as_string();
    if( a.is_double()  || b.is_double() ) return a.as_double() - b.as_double();
    if( a.is_int64()   || b.is_int64() )  return a.as_int64() - b.as_int64();
    if( a.is_uint64()  || b.is_uint64() ) return a.as_uint64() - b.as_uint64();
    FC_ASSERT( false, "invalid operation ${a} + ${b}", ("a",a)("b",b) );
}

variant operator != ( const variant& a, const variant& b )
{
    if( a.is_string()  || b.is_string() ) return a.as_string() != b.as_string();
    if( a.is_double()  || b.is_double() ) return a.as_double() != b.as_double();
    if( a.is_int64()   || b.is_int64() )  return a.as_int64() != b.as_int64();
    if( a.is_uint64()  || b.is_uint64() ) return a.as_uint64() != b.as_uint64();
    return false;
}

int from_variant(variant node)
{
	if(node.is_string()) {
		return from_string(node.as_string());
	}
	return node.as_int(-1);
}

	BlendEquation::BlendEquation(const variant& node)
		: rgb_(BlendEquationConstants::BE_ADD),
		  alpha_(BlendEquationConstants::BE_ADD)
	{
		if(node.is_map()) {
			if(node.has_key("rgba")) {
				rgb_ = alpha_ = convert_string_to_equation(node["rgba"].as_string());
			} 
			if(node.has_key("rgb")) {
				rgb_ = convert_string_to_equation(node["rgb"].as_string());
			}
			if(node.has_key("alpha")) {
				alpha_ = convert_string_to_equation(node["alpha"].as_string());
			}
			if(node.has_key("a")) {
				alpha_ = convert_string_to_equation(node["a"].as_string());
			}
		} else if(node.is_list()) {
			ASSERT_LOG(node.num_elements() > 0, "When using a list for blend equation must give at least one element");
			if(node.num_elements() == 1) {
				rgb_ = alpha_ = convert_string_to_equation(node[0].as_string());
			} else {
				rgb_   = convert_string_to_equation(node[0].as_string());
				alpha_ = convert_string_to_equation(node[1].as_string());
			}
		} else if(node.is_string()) {
			// simply setting the rgb/alpha values that same, from string
			rgb_ = alpha_ = convert_string_to_equation(node.as_string());
		} else {
			ASSERT_LOG(false, "Unrecognised type for blend equation: " << node.to_debug_string());
		}
	}

	void BlendMode::set(const variant& node) 
	{
		if(node.is_string()) {
			const std::string& blend = node.as_string();
			if(blend == "add") {
				set(BlendModeConstants::BM_ONE, BlendModeConstants::BM_ONE);
			} else if(blend == "alpha_blend") {
				set(BlendModeConstants::BM_SRC_ALPHA, BlendModeConstants::BM_ONE_MINUS_SRC_ALPHA);
			} else if(blend == "colour_blend" || blend == "color_blend") {
				set(BlendModeConstants::BM_SRC_COLOR, BlendModeConstants::BM_ONE_MINUS_SRC_COLOR);
			} else if(blend == "modulate") {
				set(BlendModeConstants::BM_DST_COLOR, BlendModeConstants::BM_ZERO);
			} else if(blend == "src_colour one" || blend == "src_color one") {
				set(BlendModeConstants::BM_SRC_COLOR, BlendModeConstants::BM_ONE);
			} else if(blend == "src_colour zero" || blend == "src_color zero") {
				set(BlendModeConstants::BM_SRC_COLOR, BlendModeConstants::BM_ZERO);
			} else if(blend == "src_colour dest_colour" || blend == "src_color dest_color") {
				set(BlendModeConstants::BM_SRC_COLOR, BlendModeConstants::BM_DST_COLOR);
			} else if(blend == "dest_colour one" || blend == "dest_color one") {
				set(BlendModeConstants::BM_DST_COLOR, BlendModeConstants::BM_ONE);
			} else if(blend == "dest_colour src_colour" || blend == "dest_color src_color") {
				set(BlendModeConstants::BM_DST_COLOR, BlendModeConstants::BM_SRC_COLOR);
			} else {
				ASSERT_LOG(false, "BlendMode: Unrecognised scene_blend mode " << blend);
			}
		} else if(node.is_list() && node.num_elements() >= 2) {
			ASSERT_LOG(node[0].is_string() && node[1].is_string(), 
				"BlendMode: Blend mode must be specified by a list of two strings.");
			set(parse_blend_string(node[0].as_string()), parse_blend_string(node[1].as_string()));
		} else {
			ASSERT_LOG(false, "BlendMode: Setting blend requires either a string or a list of greater than two elements." << node.to_debug_string());
		}
	}

void luaW_pushfaivariant(lua_State* L, variant val) {
	if(val.is_int()) {
		lua_pushinteger(L, val.as_int());
	} else if(val.is_decimal()) {
		lua_pushnumber(L, val.as_decimal() / 1000.0);
	} else if(val.is_string()) {
		const std::string result_string = val.as_string();
		lua_pushlstring(L, result_string.c_str(), result_string.size());
	} else if(val.is_list()) {
		lua_newtable(L);
		for(const variant& v : val.as_list()) {
			lua_pushinteger(L, lua_rawlen(L, -1) + 1);
			luaW_pushfaivariant(L, v);
			lua_settable(L, -3);
		}
	} else if(val.is_map()) {
		typedef std::map<variant,variant>::value_type kv_type;
		lua_newtable(L);
		for(const kv_type& v : val.as_map()) {
			luaW_pushfaivariant(L, v.first);
			luaW_pushfaivariant(L, v.second);
			lua_settable(L, -3);
		}
	} else if(val.is_callable()) {
		// First try a few special cases
		if(unit_callable* u_ref = val.try_convert<unit_callable>()) {
			const unit& u = u_ref->get_unit();
			unit_map::iterator un_it = resources::gameboard->units().find(u.get_location());
			if(&*un_it == &u) {
				luaW_pushunit(L, u.underlying_id());
			} else {
				luaW_pushunit(L, u.side(), u.underlying_id());
			}
		} else if(location_callable* loc_ref = val.try_convert<location_callable>()) {
			luaW_pushlocation(L, loc_ref->loc());
		} else {
			// If those fail, convert generically to a map
			const formula_callable* obj = val.as_callable();
			std::vector<formula_input> inputs;
			obj->get_inputs(&inputs);
			lua_newtable(L);
			for(const formula_input& attr : inputs) {
				if(attr.access == FORMULA_WRITE_ONLY) {
					continue;
				}
				lua_pushstring(L, attr.name.c_str());
				luaW_pushfaivariant(L, obj->query_value(attr.name));
				lua_settable(L, -3);
			}
		}
	} else if(val.is_null()) {
		lua_pushnil(L);
	}
}

		float convert_numeric(const variant& node)
		{
			if(node.is_int()) {
				return clamp<int>(node.as_int32(), 0, 255) / 255.0f;
			} else if(node.is_float()) {
				return clamp<float>(node.as_float(), 0.0f, 1.0f);
			} else if(node.is_string()) {
				return convert_string_to_number(node.as_string());
			}
			ASSERT_LOG(false, "attribute of Color value was expected to be numeric type.");
			return 1.0f;
		}

	bool lua_context::execute(const variant& value, game_logic::formula_callable* callable)
	{
		bool res = false;
		if(callable) {
			set_self_callable(*callable);
		}
		if(value.is_string()) {
			res = dostring("", value.as_string());
		} else {
			lua_compiled_ptr compiled = value.try_convert<lua_compiled>();
			ASSERT_LOG(compiled != NULL, "FATAL: object given couldn't be converted to type 'lua_compiled'");
			res = compiled->run(context_ptr());
		}
		return res;
	}

	void Material::init(const variant& node)
	{
		blend_.set(BlendModeConstants::BM_SRC_ALPHA, BlendModeConstants::BM_ONE_MINUS_SRC_ALPHA);

		if(node.is_string()) {
			name_ = node.as_string();
			tex_.emplace_back(DisplayDevice::createTexture(name_));
		} else if(node.is_map()) {
			name_ = node["name"].as_string();
		
			// XXX: technically a material could have multiple technique's and passes -- ignoring for now.
			ASSERT_LOG(node.has_key("technique"), "PSYSTEM2: 'material' must have 'technique' attribute.");
			ASSERT_LOG(node["technique"].has_key("pass"), "PSYSTEM2: 'material' must have 'pass' attribute.");
			const variant& pass = node["technique"]["pass"];
			use_lighting_ = pass["lighting"].as_bool(false);
			use_fog_ = pass["fog_override"].as_bool(false);
			do_depth_write_ = pass["depth_write"].as_bool(true);
			do_depth_check_ = pass["depth_check"].as_bool(true);
			if(pass.has_key("scene_blend")) {
				blend_.set(pass["scene_blend"]);
			}
			if(pass.has_key("texture_unit")) {
				if(pass["texture_unit"].is_map()) {
					tex_.emplace_back(createTexture(pass["texture_unit"]));
				} else if(pass["texture_unit"].is_list()) {
					for(size_t n = 0; n != pass["texture_unit"].num_elements(); ++n) {
						tex_.emplace_back(createTexture(pass["texture_unit"][n]));
					}
				} else {
					ASSERT_LOG(false, "'texture_unit' attribute must be map or list ");
				}
			}
			if(pass.has_key("rect")) {
				draw_rect_ = rectf(pass["rect"]);
			}
		} else {
			ASSERT_LOG(false, "Materials(Textures) must be either a single string filename or a map.");
		}
	}

 std::size_t operator() ( const variant& var ) const noexcept
 {
     static const std::hash<std::string> str_hash ;
     static const std::hash<int> int_hash ;
     return var.is_string() ? str_hash(var.str) : int_hash(var.i) ;
 }