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// -*- related-file-name: "../../liblcdf/permstr.cc" -*-
#ifndef LCDF_PERMSTR_HH
#define LCDF_PERMSTR_HH
#include <assert.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <lcdf/inttypes.h>
#include <lcdf/hashcode.hh>
class PermString;
inline bool operator==(PermString a, PermString b);
inline bool operator!=(PermString a, PermString b);
class PermString { struct Doodad; public:
typedef Doodad *Capsule;
// Declare a PermString::Initializer in any file in which you declare
// static global PermStrings.
struct Initializer { Initializer(); };
PermString()
: _rep(zero_char_doodad.data) {
}
explicit PermString(char c)
: _rep(one_char_doodad[(unsigned char) c].data) {
}
inline PermString(const char *s);
inline PermString(const char *s, int len);
inline PermString(const char *begin, const char *end);
typedef int (PermString::*unspecified_bool_type)() const;
inline operator unspecified_bool_type() const;
inline bool operator!() const;
inline int length() const;
char operator[](int i) const;
inline const char *c_str() const {
return _rep;
}
inline char operator*() const {
return *_rep;
}
inline const char *begin() const;
inline const char *end() const;
inline bool equals(const char *s, int len) const;
friend inline bool operator==(PermString a, PermString b);
friend inline bool operator!=(PermString a, PermString b);
inline Capsule capsule() const;
inline static PermString decapsule(Capsule c);
friend PermString permprintf(const char*, ...);
friend PermString vpermprintf(const char*, va_list);
friend PermString permcat(PermString, PermString);
friend PermString permcat(PermString, PermString, PermString);
private:
struct Doodad {
Doodad *next;
int length;
char data[2];
};
const char *_rep;
PermString(Doodad* d) : _rep(d->data) { }
void initialize(const char*, int);
Doodad* doodad() const { return (Doodad*)(_rep - offsetof(Doodad, data)); }
friend struct PermString::Initializer;
static void static_initialize();
enum { NHASH = 1024 }; // must be power of 2
static Doodad zero_char_doodad, one_char_doodad[256], *buckets[NHASH];
};
inline PermString::PermString(const char* s)
{
initialize(s, -1);
}
inline PermString::PermString(const char* s, int len)
{
initialize(s, len);
}
inline PermString::PermString(const char* begin, const char* end)
{
assert(end);
initialize(begin, end > begin ? end - begin : 0);
}
inline PermString::operator unspecified_bool_type() const
{
return _rep != zero_char_doodad.data ? &PermString::length : 0;
}
inline bool PermString::operator!() const
{
return _rep == zero_char_doodad.data;
}
inline int PermString::length() const
{
return doodad()->length;
}
inline const char *PermString::begin() const
{
return _rep;
}
inline const char *PermString::end() const
{
return _rep + doodad()->length;
}
inline char PermString::operator[](int i) const
{
assert((unsigned) i < (unsigned) length());
return c_str()[i];
}
inline bool operator==(PermString a, PermString b)
{
return a._rep == b._rep;
}
inline bool operator==(PermString a, const char *b)
{
return (!a || !b ? !a && !b : strcmp(a.c_str(), b) == 0);
}
inline bool operator==(const char *a, PermString b)
{
return b == a;
}
inline bool operator!=(PermString a, PermString b)
{
return a._rep != b._rep;
}
inline bool operator!=(PermString a, const char *b)
{
return !(a == b);
}
inline bool operator!=(const char *a, PermString b)
{
return !(b == a);
}
inline bool operator<(PermString a, PermString b)
{
// NOT lexicographic ordering!
return a.begin() < b.begin();
}
inline bool PermString::equals(const char *s, int len) const
{
if (len > 0)
return len == length() && memcmp(s, _rep, len) == 0;
else
return strcmp(s, _rep) == 0;
}
inline PermString::Capsule PermString::capsule() const
{
return doodad();
}
inline PermString PermString::decapsule(Capsule c)
{
return PermString(c);
}
inline hashcode_t hashcode(PermString s)
{
return (uintptr_t) s.c_str();
}
PermString permprintf(const char *format, ...);
PermString vpermprintf(const char *format, va_list val);
PermString permcat(PermString a, PermString b);
#endif
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