435 lines
9.2 KiB
C++
435 lines
9.2 KiB
C++
#pragma once
|
|
|
|
#include <algorithm>
|
|
|
|
#include "StarException.hpp"
|
|
|
|
namespace Star {
|
|
|
|
STAR_EXCEPTION(IteratorException, StarException);
|
|
|
|
// Provides java style iterators for bidirectional list-like containers
|
|
// (SIterator and SMutableIterator) and forward only map-like containers
|
|
// (SMapIterator and SMutableMapIterator)
|
|
template <typename Container>
|
|
class SIterator {
|
|
public:
|
|
typedef typename Container::const_iterator iterator;
|
|
typedef decltype(*iterator()) value_ref;
|
|
|
|
SIterator(Container const& c) : cont(c) {
|
|
toFront();
|
|
}
|
|
|
|
void toFront() {
|
|
curr = cont.begin();
|
|
direction = 0;
|
|
}
|
|
|
|
void toBack() {
|
|
curr = cont.end();
|
|
direction = 0;
|
|
}
|
|
|
|
bool hasNext() const {
|
|
return curr != cont.end();
|
|
}
|
|
|
|
bool hasPrevious() const {
|
|
return curr != cont.begin();
|
|
}
|
|
|
|
value_ref value() const {
|
|
if (direction == 1) {
|
|
if (curr != cont.end() && cont.size() != 0)
|
|
return *curr;
|
|
else
|
|
throw IteratorException("value() called on end()");
|
|
} else if (direction == -1) {
|
|
if (curr != cont.begin() && cont.size() != 0) {
|
|
iterator back = curr;
|
|
return *(--back);
|
|
} else {
|
|
throw IteratorException("value() called on begin()");
|
|
}
|
|
} else {
|
|
throw IteratorException("value() called without previous next() or previous()");
|
|
}
|
|
}
|
|
|
|
value_ref next() {
|
|
if (hasNext()) {
|
|
direction = -1;
|
|
return *(curr++);
|
|
}
|
|
throw IteratorException("next() called on end");
|
|
}
|
|
|
|
value_ref previous() {
|
|
if (hasPrevious()) {
|
|
direction = 1;
|
|
return *(--curr);
|
|
}
|
|
throw IteratorException("prev() called on beginning");
|
|
}
|
|
|
|
value_ref peekNext() const {
|
|
SIterator t = *this;
|
|
return t.next();
|
|
}
|
|
|
|
value_ref peekPrevious() const {
|
|
SIterator t = *this;
|
|
return t.previous();
|
|
}
|
|
|
|
size_t distFront() const {
|
|
return std::distance(cont.begin(), curr);
|
|
}
|
|
|
|
size_t distBack() const {
|
|
return std::distance(curr, cont.end());
|
|
}
|
|
|
|
private:
|
|
SIterator& operator=(iterator const& i) {
|
|
return iterator::operator=(i);
|
|
}
|
|
Container const& cont;
|
|
iterator curr;
|
|
|
|
int direction;
|
|
};
|
|
|
|
template <typename Container>
|
|
SIterator<Container> makeSIterator(Container const& c) {
|
|
return SIterator<Container>(c);
|
|
}
|
|
|
|
template <typename Container>
|
|
class SMutableIterator {
|
|
public:
|
|
typedef typename Container::value_type value_type;
|
|
typedef typename Container::iterator iterator;
|
|
typedef decltype(*iterator()) value_ref;
|
|
|
|
SMutableIterator(Container& c) : cont(c) {
|
|
toFront();
|
|
}
|
|
|
|
void toFront() {
|
|
curr = cont.begin();
|
|
direction = 0;
|
|
}
|
|
|
|
void toBack() {
|
|
curr = cont.end();
|
|
direction = 0;
|
|
}
|
|
|
|
bool hasNext() const {
|
|
return curr != cont.end();
|
|
}
|
|
|
|
bool hasPrevious() const {
|
|
return curr != cont.begin();
|
|
}
|
|
|
|
void insert(value_type v) {
|
|
curr = ++cont.insert(curr, std::move(v));
|
|
direction = -1;
|
|
}
|
|
|
|
void remove() {
|
|
if (direction == 1) {
|
|
direction = 0;
|
|
if (curr != cont.end() && cont.size() != 0)
|
|
curr = cont.erase(curr);
|
|
else
|
|
throw IteratorException("remove() called on end()");
|
|
} else if (direction == -1) {
|
|
direction = 0;
|
|
if (curr != cont.begin() && cont.size() != 0)
|
|
curr = cont.erase(--curr);
|
|
else
|
|
throw IteratorException("remove() called on begin()");
|
|
} else {
|
|
throw IteratorException("remove() called without previous next() or previous()");
|
|
}
|
|
}
|
|
|
|
value_ref value() const {
|
|
if (direction == 1) {
|
|
if (curr != cont.end() && cont.size() != 0)
|
|
return *curr;
|
|
else
|
|
throw IteratorException("value() called on end()");
|
|
} else if (direction == -1) {
|
|
if (curr != cont.begin() && cont.size() != 0) {
|
|
iterator back = curr;
|
|
return *(--back);
|
|
} else {
|
|
throw IteratorException("value() called on begin()");
|
|
}
|
|
} else {
|
|
throw IteratorException("value() called without previous next() or previous()");
|
|
}
|
|
}
|
|
|
|
void setValue(value_type v) const {
|
|
value() = std::move(v);
|
|
}
|
|
|
|
value_ref next() {
|
|
if (curr == cont.end())
|
|
throw IteratorException("next() called on end");
|
|
direction = -1;
|
|
return *curr++;
|
|
}
|
|
|
|
value_ref previous() {
|
|
if (curr == cont.begin())
|
|
throw IteratorException("previous() called on begin");
|
|
direction = 1;
|
|
return *--curr;
|
|
}
|
|
|
|
value_ref peekNext() const {
|
|
SMutableIterator n = *this;
|
|
return n.next();
|
|
}
|
|
|
|
value_ref peekPrevious() const {
|
|
SMutableIterator n = *this;
|
|
return n.previous();
|
|
}
|
|
|
|
size_t distFront() const {
|
|
return std::distance(cont.begin(), curr);
|
|
}
|
|
|
|
size_t distBack() const {
|
|
return std::distance(curr, cont.end());
|
|
}
|
|
|
|
private:
|
|
SMutableIterator& operator=(iterator const& i) {
|
|
return iterator::operator=(i);
|
|
}
|
|
|
|
Container& cont;
|
|
iterator curr;
|
|
|
|
// -1 means remove() will remove --cur, +1 means ++cur, 0 means remove() is
|
|
// invalid.
|
|
int direction;
|
|
};
|
|
|
|
template <typename Container>
|
|
SMutableIterator<Container> makeSMutableIterator(Container& c) {
|
|
return SMutableIterator<Container>(c);
|
|
}
|
|
|
|
template <typename Container>
|
|
class SMapIterator {
|
|
public:
|
|
typedef typename Container::key_type key_type;
|
|
typedef typename Container::mapped_type mapped_type;
|
|
|
|
typedef typename Container::const_iterator iterator;
|
|
typedef decltype(*iterator()) value_ref;
|
|
|
|
SMapIterator(Container const& c) : cont(c) {
|
|
toFront();
|
|
}
|
|
|
|
void toFront() {
|
|
curr = cont.end();
|
|
}
|
|
|
|
void toBack() {
|
|
curr = cont.end();
|
|
if (curr != cont.begin())
|
|
--curr;
|
|
}
|
|
|
|
bool hasNext() const {
|
|
iterator end = cont.end();
|
|
if (curr == end)
|
|
return cont.begin() != end;
|
|
else
|
|
return ++iterator(curr) != end;
|
|
}
|
|
|
|
key_type const& key() const {
|
|
if (curr != cont.end()) {
|
|
return curr->first;
|
|
} else {
|
|
throw IteratorException("key() called on begin()");
|
|
}
|
|
}
|
|
|
|
mapped_type const& value() const {
|
|
if (curr != cont.end()) {
|
|
return curr->second;
|
|
} else {
|
|
throw IteratorException("value() called on begin()");
|
|
}
|
|
}
|
|
|
|
value_ref const& next() {
|
|
if (hasNext()) {
|
|
if (curr == cont.end())
|
|
curr = cont.begin();
|
|
else
|
|
++curr;
|
|
return *curr;
|
|
}
|
|
throw IteratorException("next() called on end");
|
|
}
|
|
|
|
value_ref peekNext() const {
|
|
SMapIterator t = *this;
|
|
return t.next();
|
|
}
|
|
|
|
size_t distFront() const {
|
|
return std::distance(cont.begin(), curr);
|
|
}
|
|
|
|
size_t distBack() const {
|
|
return std::distance(curr, cont.end()) - 1;
|
|
}
|
|
|
|
protected:
|
|
SMapIterator& operator=(iterator const& i) {
|
|
return iterator::operator=(i);
|
|
}
|
|
Container const& cont;
|
|
iterator curr;
|
|
};
|
|
|
|
template <typename Container>
|
|
SMapIterator<Container> makeSMapIterator(Container const& c) {
|
|
return SMapIterator<Container>(c);
|
|
}
|
|
|
|
template <typename Container>
|
|
class SMutableMapIterator {
|
|
public:
|
|
typedef typename Container::key_type key_type;
|
|
typedef typename Container::mapped_type mapped_type;
|
|
|
|
typedef typename Container::iterator iterator;
|
|
typedef decltype(*iterator()) value_ref;
|
|
|
|
SMutableMapIterator(Container& c) : cont(c) {
|
|
toFront();
|
|
}
|
|
|
|
void toFront() {
|
|
curr = cont.end();
|
|
remCalled = false;
|
|
}
|
|
|
|
void toBack() {
|
|
curr = cont.end();
|
|
if (curr != cont.begin())
|
|
--curr;
|
|
}
|
|
|
|
bool hasNext() const {
|
|
iterator end = cont.end();
|
|
if (curr == end)
|
|
return cont.begin() != end && !remCalled;
|
|
else if (remCalled)
|
|
return curr != end;
|
|
else
|
|
return ++iterator(curr) != end;
|
|
}
|
|
|
|
key_type const& key() const {
|
|
if (remCalled)
|
|
throw IteratorException("key() called after remove()");
|
|
else if (curr != cont.end())
|
|
return curr->first;
|
|
else
|
|
throw IteratorException("key() called on begin()");
|
|
}
|
|
|
|
mapped_type& value() const {
|
|
if (remCalled)
|
|
throw IteratorException("value() called after remove()");
|
|
else if (curr != cont.end())
|
|
return curr->second;
|
|
else
|
|
throw IteratorException("value() called on begin()");
|
|
}
|
|
|
|
value_ref next() {
|
|
if (hasNext()) {
|
|
if (curr == cont.end())
|
|
curr = cont.begin();
|
|
else if (remCalled)
|
|
remCalled = false;
|
|
else
|
|
++curr;
|
|
|
|
return *curr;
|
|
} else {
|
|
throw IteratorException("next() called on end");
|
|
}
|
|
}
|
|
|
|
value_ref peekNext() const {
|
|
SMutableMapIterator t = *this;
|
|
return t.next();
|
|
}
|
|
|
|
void remove() {
|
|
if (remCalled) {
|
|
throw IteratorException("remove() called twice");
|
|
} else if (curr == cont.end()) {
|
|
throw IteratorException("remove() called at front");
|
|
} else {
|
|
if (curr == cont.begin()) {
|
|
cont.erase(curr);
|
|
curr = cont.end();
|
|
} else {
|
|
curr = cont.erase(curr);
|
|
remCalled = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
size_t distFront() const {
|
|
if (curr == cont.end())
|
|
return 0;
|
|
else
|
|
return std::distance(cont.begin(), curr) - (remCalled ? 1 : 0);
|
|
}
|
|
|
|
size_t distBack() const {
|
|
if (curr == cont.end())
|
|
return cont.size();
|
|
else
|
|
return std::distance(curr, cont.end()) - 1 + (remCalled ? 1 : 0);
|
|
}
|
|
|
|
private:
|
|
SMutableMapIterator& operator=(iterator const& i) {
|
|
return iterator::operator=(i);
|
|
}
|
|
|
|
Container& cont;
|
|
iterator curr;
|
|
bool remCalled;
|
|
};
|
|
|
|
template <typename Container>
|
|
SMutableMapIterator<Container> makeSMutableMapIterator(Container& c) {
|
|
return SMutableMapIterator<Container>(c);
|
|
}
|
|
|
|
}
|