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/* $Id$ */
/** @file dbg_helpers.h Functions to be used for debug printings. */
#ifndef DBG_HELPERS_H
#define DBG_HELPERS_H
#include <new>
#include <map>
#include <stack>
#include "blob.hpp"
#include "str.hpp"
/** Helper template class that provides C array length and item type */
template <typename T> struct ArrayT;
/** Helper template class that provides C array length and item type */
template <typename T, size_t N> struct ArrayT<T[N]> {
static const size_t length = N;
typedef T item_t;
};
/**
* Helper template function that returns item of array at given index
* or t_unk when index is out of bounds.
*/
template <typename E, typename T>
inline typename ArrayT<T>::item_t ItemAtT(E idx, T &t, typename ArrayT<T>::item_t t_unk)
{
if ((size_t)idx >= ArrayT<T>::length) {
return t_unk;
}
return t[idx];
}
/**
* Helper template function that returns item of array at given index
* or t_inv when index == idx_inv
* or t_unk when index is out of bounds.
*/
template <typename E, typename T>
inline typename ArrayT<T>::item_t ItemAtT(E idx, T &t, typename ArrayT<T>::item_t t_unk, E idx_inv, typename ArrayT<T>::item_t t_inv)
{
if ((size_t)idx < ArrayT<T>::length) {
return t[idx];
}
if (idx == idx_inv) {
return t_inv;
}
return t_unk;
}
/**
* Helper template function that returns compound bitfield name that is
* concatenation of names of each set bit in the given value
* or t_inv when index == idx_inv
* or t_unk when index is out of bounds.
*/
template <typename E, typename T>
inline CStrA ComposeNameT(E value, T &t, const char *t_unk, E val_inv, const char *name_inv)
{
CStrA out;
if (value == val_inv) {
out = name_inv;
} else if (value == 0) {
out = "<none>";
} else {
for (size_t i = 0; i < ArrayT<T>::length; i++) {
if ((value & (1 << i)) == 0) continue;
out.AddFormat("%s%s", (out.Size() > 0 ? "+" : ""), t[i]);
value &= ~(E)(1 << i);
}
if (value != 0) out.AddFormat("%s%s", (out.Size() > 0 ? "+" : ""), t_unk);
}
return out.Transfer();
}
CStrA ValueStr(Trackdir td);
CStrA ValueStr(TrackdirBits td_bits);
CStrA ValueStr(DiagDirection dd);
CStrA ValueStr(SignalType t);
/** Class that represents the dump-into-string target. */
struct DumpTarget {
/** Used as a key into map of known object instances. */
struct KnownStructKey {
size_t m_type_id;
const void *m_ptr;
KnownStructKey(size_t type_id, const void *ptr)
: m_type_id(type_id)
, m_ptr(ptr)
{}
KnownStructKey(const KnownStructKey &src)
{
m_type_id = src.m_type_id;
m_ptr = src.m_ptr;
}
bool operator < (const KnownStructKey &other) const
{
if ((size_t)m_ptr < (size_t)other.m_ptr) return true;
if ((size_t)m_ptr > (size_t)other.m_ptr) return false;
if (m_type_id < other.m_type_id) return true;
return false;
}
};
typedef std::map<KnownStructKey, CStrA> KNOWN_NAMES;
CStrA m_out; ///< the output string
int m_indent; ///< current indent/nesting level
std::stack<CStrA> m_cur_struct; ///< here we will track the current structure name
KNOWN_NAMES m_known_names; ///< map of known object instances and their structured names
DumpTarget()
: m_indent(0)
{}
static size_t& LastTypeId();
CStrA GetCurrentStructName();
bool FindKnownName(size_t type_id, const void *ptr, CStrA &name);
void WriteIndent();
void WriteLine(const char *format, ...);
void WriteValue(const char *name, const char *value_str);
void WriteTile(const char *name, TileIndex t);
/** Dump given enum value (as a number and as named value) */
template <typename E> void WriteEnumT(const char *name, E e)
{
WriteValue(name, ValueStr(e).Data());
}
void BeginStruct(size_t type_id, const char *name, const void *ptr);
void EndStruct();
/** Dump nested object (or only its name if this instance is already known). */
template <typename S> void WriteStructT(const char *name, const S *s)
{
static size_t type_id = ++LastTypeId();
if (s == NULL) {
/* No need to dump NULL struct. */
WriteLine("%s = <null>", name);
return;
}
CStrA known_as;
if (FindKnownName(type_id, s, known_as)) {
/* We already know this one, no need to dump it. */
WriteLine("%s = known_as.%s", name, known_as.Data());
} else {
/* Still unknown, dump it */
BeginStruct(type_id, name, s);
s->Dump(*this);
EndStruct();
}
}
};
#endif /* DBG_HELPERS_H */
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