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bridge_device.cpp
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bridge_device.cpp
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#include "common.h"
#include "device.h"
Device *BridgeDevice::create(void) {
return new BridgeDevice();
}
std::string BridgeDevice::name(void) {
return "Bridge";
}
Rgb BridgeDevice::color = Rgb(0x79, 0x44, 0x3b);
bool BridgeDevice::parse(AspngSurface *surface, Coord coord) {
this->patch = this->flood(surface, coord, BridgeDevice::color);
return this->patch.size() == 1;
}
std::list<Patch *> BridgeDevice::all_patches(void) {
std::list<Patch *> all_patches;
all_patches.push_back(&(this->patch));
return all_patches;
}
std::tuple<LinkResult, PortType, std::string> BridgeDevice::prelink(Patch *, std::shared_ptr<Device> d) {
if (std::dynamic_pointer_cast<CopperDevice>(d))
return std::make_tuple(CanLink, ToBeResolved, "");
// Why use a Bridge if any of its ports are unused?
return std::make_tuple(LinkError, NoSpecialMeaning, "must touch copper");
}
bool BridgeDevice::link(void) {
// Why use a Bridge if any of its ports are unused?
auto all_ports = this->all_ports();
if (all_ports.size() != 4)
return false;
int north_south_ports = 0;
int east_west_ports = 0;
for (auto i = all_ports.begin(); i != all_ports.end(); i++) {
auto port = *i;
auto *port_our_half = port->get_our_port_half(this);
ASSERT(port_our_half->port_type == ToBeResolved);
auto *port_their_half = port->get_their_port_half(this);
if (port_our_half->coord.x == port_their_half->coord.x) {
port_our_half->port_type = BridgeNorthSouth;
north_south_ports++;
} else if (port_our_half->coord.y == port_their_half->coord.y) {
port_our_half->port_type = BridgeEastWest;
east_west_ports++;
} else {
ASSERT(0);
}
}
ASSERT(north_south_ports == 2);
ASSERT(east_west_ports == 2);
return true;
}
std::list<std::shared_ptr<Port>> BridgeDevice::propagate(std::shared_ptr<Port> port) {
// East-west ports connect, and north-south ports connect.
auto all_ports = this->all_ports();
std::list<std::shared_ptr<Port>> next_ports;
for (auto i = all_ports.begin(); i != all_ports.end(); i++) {
auto port2 = *i;
if (port2 == port) {
continue;
}
if (port2->get_our_port_half(this)->port_type == port->get_our_port_half(this)->port_type) {
next_ports.push_back(port2);
}
}
ASSERT(next_ports.size() == 1);
return next_ports;
}
ElectricalValue BridgeDevice::get_value_at_port(std::shared_ptr<Port>) {
return EmptyElectricalValue;
}
void BridgeDevice::apply_new_value(std::shared_ptr<Port>, ElectricalValue) {
// Deliberately empty.
}
Rgb BridgeDevice::get_draw_color(Patch *) {
return BridgeDevice::color;
}