lyx_mirror/src/support/lyxstring.C

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/**
* \file lyxstring.C
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Lars Gullik Bj<EFBFBD>nnes
*
* Full author contact details are available in file CREDITS
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "lyxstring.h"
#include <cstdlib>
#include <cctype>
#include <algorithm>
#include "LAssert.h"
#include "debug.h"
using std::min;
using std::istream;
using std::ostream;
// This class is supposed to be functionaly equivalent to a
// standard conformant string. This mean among others that we
// are useing the same requirements. Before you change anything
// in this file consult me and/or the standard to discover the
// right behavior.
// Asserts with a STD! are required by the standard.
// Asserts with a OURS! are added by me.
// Some asserts could still be missing and some of the existing
// ones might be wrong or not needed.
// Reference count has been checked, empty_rep removed and
// introduced again in a similar guise. Where is empty_rep _really_
// needed?
// We are missing a couple of imporant things from the standard:
// reverse iterators and methods taking InputIterators as paramters.
// Also the methods returning iterators is returning the wrong value.
// All the different find functions need a good look over.
// I have so far not tested them extensively and would be
// happy if others took the time to have a peek.
// Space allocation of string.
// I have tried to do this very simple without using any special tricks.
// Earlier we used a fixed value to enlarge the string with this would
// cause a lot of reallocations with large strings (especially if
// push_back was used) and wasting space for very small strings.
// I have now changed the allocation to use a doubling of reserved
// space until it is large enough. So far tests show a small speed
// increase and a noticable memory saving.
// Lgb.
///////////////////////////////////////
// The internal string representation
///////////////////////////////////////
struct lyxstring::Srep {
/// size
size_t sz;
/// Reference count
size_t ref;
/// The total amount of data reserved for this representaion
size_t res;
/// Data. At least 1 char for trailing null.
lyxstring::value_type * s;
///
Srep(lyxstring::size_type nsz, const lyxstring::value_type * p);
///
Srep(lyxstring::size_type nsz, lyxstring::value_type ch);
///
~Srep() { delete[] s; }
///
Srep * get_own_copy() {
if (ref == 1) return this;
--ref;
return new Srep(sz, s);
}
///
void assign(lyxstring::size_type nsz, const lyxstring::value_type * p);
///
void assign(lyxstring::size_type nsz, lyxstring::value_type ch);
///
void append(lyxstring::size_type asz, const lyxstring::value_type * p);
///
void push_back(lyxstring::value_type c);
///
void insert(lyxstring::size_type pos,
const lyxstring::value_type * p,
lyxstring::size_type n);
///
void resize(lyxstring::size_type n, lyxstring::value_type c);
///
void reserve(lyxstring::size_type res_arg);
///
void replace(lyxstring::size_type i, lyxstring::size_type n,
lyxstring::value_type const * p, lyxstring::size_type n2);
private:
Srep(const Srep &);
Srep & operator=(const Srep &);
};
lyxstring::Srep::Srep(lyxstring::size_type nsz, const value_type * p)
{
// can be called with p == 0 by
// lyxstring::assign(const value_type *, size_type)
sz = nsz;
ref = 1;
res = sz ? sz : 1;
s = new value_type[res + 1]; // add space for terminator
if (p && sz) {
// if sz = 0 nothing gets copied and we have an error
memcpy(s, p, sz);
} else {
// possibly allows for large but empty string
sz = 0; // this line should be redundant
s[0] = '\0';
}
}
lyxstring::Srep::Srep(lyxstring::size_type nsz, value_type ch)
{
sz = nsz;
ref = 1;
res = sz ? sz : 1;
s = new value_type[res + 1]; // add space for terminator
memset(s, ch, sz);
if (!ch) {
// if ch == '\0' strlen(lyxstring.c_str()) == 0 so sz = 0
// allows for large but empty string
sz = 0;
}
}
void lyxstring::Srep::assign(lyxstring::size_type nsz, const value_type * p)
{
// can be called with p == 0
// by lyxstring::assign(const value_type *, size_type)
if (res < nsz) {
delete[] s;
sz = nsz;
res = sz ? sz : 1;
s = new value_type[res + 1]; // add space for terminator
} else {
sz = nsz;
}
if (p && sz) {
// if sz = 0 nothing gets copied and we have an error
memcpy(s, p, sz);
} else {
// stops segfaults
sz = 0; // this line should be redundant
s[0] = '\0';
}
}
void lyxstring::Srep::assign(lyxstring::size_type nsz, value_type ch)
{
sz = nsz;
if (res < nsz) {
delete[] s;
res = sz ? sz : 1;
s = new value_type[res + 1]; // add space for terminator
}
memset(s, ch, sz);
if (!ch) {
// if ch == '\0' strlen(lyxstring.c_str()) == 0 so sz = 0
// allows for a large empty string
sz = 0;
}
}
void lyxstring::Srep::append(lyxstring::size_type asz, const value_type * p)
{
register unsigned int const len = sz + asz;
if (res < len) {
do {
res *= 2;
} while (res < len);
value_type * tmp = new value_type[res + 1];
memcpy(tmp, s, sz);
memcpy(tmp + sz, p, asz);
sz += asz;
delete[] s;
s = tmp;
} else {
memcpy(s + sz, p, asz);
sz += asz;
}
}
void lyxstring::Srep::push_back(value_type c)
{
s[sz] = c; // it is always room to put a value_type at the end
++sz;
if (res < sz) {
do {
res *= 2;
} while (res < sz);
value_type * tmp = new value_type[res + 1];
memcpy(tmp, s, sz);
delete[] s;
s = tmp;
}
}
void lyxstring::Srep::insert(lyxstring::size_type pos, const value_type * p,
lyxstring::size_type n)
{
if (res < n + sz) {
do {
res *= 2;
} while (res < n + sz);
value_type * tmp = new value_type[res + 1];
memcpy(tmp, s, pos);
memcpy(tmp + pos, p, n);
memcpy(tmp + pos + n, &s[pos], sz - pos);
sz += n;
delete[] s;
s = tmp;
} else {
memmove(s + pos + n, &s[pos], sz - pos);
memcpy(s + pos, p, n);
sz += n;
}
}
void lyxstring::Srep::resize(size_type n, value_type c)
{
// This resets sz to res_arg
res = min(n, npos - 2); // We keep no xtra when we resize
value_type * tmp = new value_type[res + 1];
memcpy(tmp, s, min(sz, res));
if (res > sz)
memset(tmp + sz, c, res - sz);
delete[] s;
sz = res;
s = tmp;
}
void lyxstring::Srep::reserve(lyxstring::size_type res_arg)
{
// This keeps the old sz, but
// increases res with res_arg
res += res_arg;
value_type * tmp = new value_type[res + 1];
memcpy(tmp, s, sz);
delete[] s;
s = tmp;
}
void lyxstring::Srep::replace(lyxstring::size_type i, lyxstring::size_type n,
value_type const * p, size_type n2)
{
// can be called with p= 0 and n2= 0
n = min(sz - i, n);
sz -= n;
if (res >= n2 + sz) {
memmove(s + i + n2, &s[i + n], sz - i);
memcpy(s + i, p, n2);
sz += n2;
} else {
do {
res *= 2;
} while (res < n2 + sz);
value_type * tmp = new value_type[res + 1];
memcpy(tmp, s, i);
memcpy(tmp + i, p, n2);
memcpy(tmp + i + n2, &s[i + n], sz - i);
delete[] s;
s = tmp;
sz += n2;
}
}
///////////////////////////////////////
// The lyxstring Invariant tester
///////////////////////////////////////
// There are no know bugs in lyxstring now, and it have been
// tested for a long time. so we disable the invariant checker. (Lgb)
#undef ENABLE_ASSERTIONS
#ifdef ENABLE_ASSERTIONS
/** Testing of the lyxstring invariant
* By creating an object that tests the lyxstring invariant during its
* construction *and* its deconstruction we greatly simplify our code.
* Calling TestlyxstringInvariant() upon entry to an lyxstring method
* will test the invariant upon entry to the code. If the Asserts fail
* then we know from the stack trace that the corruption occurred *before*
* entry to this method. We can also be sure it didn't happen in any of
* the tested lyxstring methods. It is therefore likely to be due to some
* other external force.
* Several lyxstring methods have multiple exit points which would otherwise
* require us to insert a separate test before each return. But since we
* created an object its destructor will be called upon exit (any exit!).
* We thus get testing at both start and end of a method with one line of
* code at the head of a method. More importantly, we get good testing
* everytime we run the code.
* NOTE: just because we test the invariant doesn't mean we can forget
* about testing pre and post conditions specific to any given method.
* This test simply proves that the lyxstring/Srep is in a valid state it
* does *not* prove that the method did what it was supposed to.
*/
class lyxstringInvariant {
public:
lyxstringInvariant(lyxstring const *);
~lyxstringInvariant();
private:
void helper() const;
lyxstring const * object;
};
// To test if this scheme works "as advertised" uncomment the printf's in
// the constructor and destructor below and then uncomment the printf and the
// call to TestlyxstringInvariant() in lyxstring::operator=(char const *).
// The correct output when LyX has been recompiled and run is:
// lyxstringInvariant constructor
// lyxstring::operator=(char const *)
// lyxstringInvariant constructor
// lyxstringInvariant destructor completed
// lyxstringInvariant destructor completed
// NOTE: The easiest way to catch this snippet of the output is to wait for
// the splash screen to disappear and then open and close Help->Credits
//
lyxstringInvariant::lyxstringInvariant(lyxstring const * ls) : object(ls)
{
// printf("lyxstringInvariant constructor\n");
helper();
}
lyxstringInvariant::~lyxstringInvariant()
{
helper();
// printf("lyxstringInvariant destructor completed\n");
}
void lyxstringInvariant::helper() const
{
// Some of these tests might look pointless but they are
// all part of the invariant and if we want to make sure
// we have a bullet proof implementation then we need to
// test every last little thing we *know* should be true.
// I may have missed a test or two, so feel free to fill
// in the gaps. ARRae.
using lyx::Assert;
Assert(object);
Assert(object->rep);
Assert(object->rep->s); // s is never 0
Assert(object->rep->res); // res cannot be 0
Assert(object->rep->sz <= object->rep->res);
Assert(object->rep->ref >= 1); // its in use so it must be referenced
Assert(object->rep->ref < 1UL << (8UL * sizeof(object->rep->ref) - 1));
// if it does ever == then we should be generating a new copy
// and starting again. (Is char always 8-bits?)
}
#define TestlyxstringInvariant(s) lyxstringInvariant lyxstring_invariant(s);
#else
#define TestlyxstringInvariant(s)
#endif /* ENABLE_ASSERTIONS */
///////////////////////////////////////
// Constructors and Deconstructors.
///////////////////////////////////////
lyxstring::size_type const lyxstring::npos =
static_cast<lyxstring::size_type>(-1);
lyxstring::lyxstring()
{
static Srep empty_rep(0, "");
++empty_rep.ref;
rep = &empty_rep;
}
lyxstring::lyxstring(lyxstring const & x, size_type pos, size_type n)
{
lyx::Assert(pos <= x.rep->sz); // STD!
if (pos == 0 && n >= x.length()) { // this is the default
x.rep->ref++;
rep = x.rep;
} else {
rep = new Srep(min(n, x.rep->sz - pos), &(x.rep->s[pos]));
}
}
lyxstring::lyxstring(value_type const * s, size_type n)
{
lyx::Assert(s && n < npos); // STD!
static Srep empty_rep(0, "");
if (n) { // n > 0
rep = new Srep(n, s);
} else {
++empty_rep.ref;
rep = &empty_rep;
}
}
lyxstring::lyxstring(value_type const * s)
{
lyx::Assert(s); // STD!
static Srep empty_rep(0, "");
if (*s) { // s is not empty string
rep = new Srep(strlen(s), s);
} else {
++empty_rep.ref;
rep = &empty_rep;
}
}
lyxstring::lyxstring(size_type n, value_type c)
{
lyx::Assert(n < npos); // STD!
rep = new Srep(n, c);
}
lyxstring::lyxstring(const_iterator first, const_iterator last)
{
rep = new Srep(last - first, first);
}
lyxstring::~lyxstring()
{
if (--rep->ref == 0) delete rep;
}
///////////////////////
// Iterators
///////////////////////
lyxstring::iterator lyxstring::begin()
{
rep = rep->get_own_copy();
return rep->s;
}
lyxstring::const_iterator lyxstring::begin() const
{
return rep->s;
}
lyxstring::iterator lyxstring::end()
{
rep = rep->get_own_copy();
return rep->s + rep->sz;
}
lyxstring::const_iterator lyxstring::end() const
{
return rep->s + rep->sz;
}
#if 0
reverse_iterator lyxstring::rbegin()
{
return reverse_iterator( end() );
}
const_reverse_iterator lyxstring::rbegin() const
{
return const_reverse_iterator( end() );
}
reverse_iterator lyxstring::rend()
{
return reverse_iterator( begin() );
}
const_reverse_iterator lyxstring::rend() const
{
return const_reverse_iterator( begin() );
}
#endif
///////////////////////
// Size and Capacity
///////////////////////
lyxstring::size_type lyxstring::size() const
{
return rep->sz;
}
void lyxstring::resize(size_type n, value_type c)
{
lyx::Assert(n <= npos); // STD!
TestlyxstringInvariant(this);
// This resets sz to res_arg
rep = rep->get_own_copy();
rep->resize(n, c);
}
lyxstring::size_type lyxstring::capacity() const
{
return rep->res;
}
void lyxstring::reserve(size_type res_arg)
{
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->reserve(res_arg);
}
////////////////
// Assignment
////////////////
lyxstring & lyxstring::operator=(lyxstring const & x)
{
TestlyxstringInvariant(this);
return assign(x);
}
lyxstring & lyxstring::operator=(value_type const * s)
{
lyx::Assert(s); // OURS!
TestlyxstringInvariant(this);
// printf("lyxstring::operator= (value_type const *)\n");
return assign(s);
}
lyxstring & lyxstring::operator=(value_type c)
{
TestlyxstringInvariant(this);
value_type s[1];
s[0] = c;
if (rep->ref == 1) // recycle rep
rep->assign(1, s);
else {
rep->ref--;
rep = new Srep(1, s);
}
return *this;
}
lyxstring & lyxstring::assign(lyxstring const & x)
{
TestlyxstringInvariant(this);
x.rep->ref++; // protect against ``st = st''
if (--rep->ref == 0) delete rep;
rep = x.rep; // share representation
return *this;
}
lyxstring & lyxstring::assign(lyxstring const & x, size_type pos, size_type n)
{
lyx::Assert(pos <= x.rep->sz); // STD!
TestlyxstringInvariant(this);
return assign(x.substr(pos, n));
}
lyxstring & lyxstring::assign(value_type const * s, size_type n)
{
lyx::Assert(s && n < npos); // STD!
TestlyxstringInvariant(this);
if (rep->ref == 1) // recycle rep
rep->assign(n, s);
else {
--rep->ref;
rep = new Srep(n, s);
}
return *this;
}
lyxstring & lyxstring::assign(value_type const * s)
{
lyx::Assert(s); // OURS!
TestlyxstringInvariant(this);
return assign(s, strlen(s));
}
lyxstring & lyxstring::assign(size_type n, value_type ch)
{
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->assign(n, ch);
return *this;
}
lyxstring & lyxstring::assign(const_iterator first, const_iterator last)
{
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->assign(last - first, first);
return *this;
}
////////////////////
// Element Access
////////////////////
lyxstring::const_reference lyxstring::operator[](size_type pos) const
{
#if 0
// This is actually what the standard requires,
lyx::Assert(pos <= rep->sz); // OURS!
static char const helper = '\0';
return pos == rep->sz ? helper : rep->s[pos];
#else
// but we use this one since it is stricter
// and more according to the real intent of std::string.
lyx::Assert(pos < rep->sz); // OURS!
return rep->s[pos];
#endif
}
lyxstring::reference lyxstring::operator[](size_type pos)
{
lyx::Assert(pos < rep->sz); // OURS!
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
return rep->s[pos];
}
lyxstring::const_reference lyxstring::at(size_type n) const
{
lyx::Assert(n < rep->sz); // STD!
return rep->s[n];
}
lyxstring::reference lyxstring::at(size_type n)
{
lyx::Assert(n < rep->sz); // STD!
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
return rep->s[n];
}
/////////////
// Insert
/////////////
lyxstring & lyxstring::operator+=(lyxstring const & x)
{
TestlyxstringInvariant(this);
return append(x);
}
lyxstring & lyxstring::operator+=(value_type const * x)
{
lyx::Assert(x); // OURS!
TestlyxstringInvariant(this);
return append(x);
}
lyxstring & lyxstring::operator+=(value_type c)
{
TestlyxstringInvariant(this);
push_back(c);
return *this;
}
void lyxstring::push_back(value_type c)
{
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->push_back(c);
}
lyxstring & lyxstring::append(lyxstring const & x)
{
TestlyxstringInvariant(this);
if (x.empty()) return *this;
rep = rep->get_own_copy();
rep->append(x.length(), x.rep->s);
return *this;
}
lyxstring & lyxstring::append(lyxstring const & x, size_type pos, size_type n)
{
lyx::Assert(pos <= x.rep->sz); // STD!
TestlyxstringInvariant(this);
return append(x.substr(pos, n));
}
lyxstring & lyxstring::append(value_type const * p, size_type n)
{
lyx::Assert(p); // OURS!
TestlyxstringInvariant(this);
if (!*p || !n) return *this;
rep = rep->get_own_copy();
rep->append(n, p);
return *this;
}
lyxstring & lyxstring::append(value_type const * p)
{
lyx::Assert(p); // OURS!
return append(p, strlen(p));
}
lyxstring & lyxstring::append(size_type n, value_type c)
{
TestlyxstringInvariant(this);
value_type * tmp = new value_type[n];
memset(tmp, c, n);
rep = rep->get_own_copy();
rep->append(n, tmp);
delete[] tmp;
return *this;
}
lyxstring & lyxstring::append(iterator first, iterator last)
{
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->append(last - first, first);
return *this;
}
// insert characters before (*this)[pos]
lyxstring & lyxstring::insert(size_type pos, lyxstring const & x)
{
TestlyxstringInvariant(this);
return insert(pos, x, 0, x.rep->sz);
}
lyxstring & lyxstring::insert(size_type pos, lyxstring const & x,
size_type pos2, size_type n)
{
lyx::Assert(pos <= rep->sz && pos2 <= x.rep->sz); // STD!
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->insert(pos, &(x.rep->s[pos2]), min(n, x.rep->sz));
return *this;
}
lyxstring & lyxstring::insert(size_type pos, value_type const * p, size_type n)
{
lyx::Assert(p); // OURS!
TestlyxstringInvariant(this);
if (*p && n) {
// insert nothing and you change nothing
rep = rep->get_own_copy();
rep->insert(pos, p, n);
}
return *this;
}
lyxstring & lyxstring::insert(size_type pos, value_type const * p)
{
lyx::Assert(p); // OURS!
return insert(pos, p, strlen(p));
}
lyxstring & lyxstring::insert(size_type pos, size_type n, value_type c)
{
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
value_type * tmp = new value_type[n];
memset(tmp, c, n);
rep->insert(pos, tmp, n);
delete[] tmp;
return *this;
}
lyxstring::iterator lyxstring::insert(iterator p, value_type c)
{
TestlyxstringInvariant(this);
// what iterator is this supposed to return??
size_type tmp = p - begin();
insert(p - begin(), 1, c);
return begin() + tmp + 1; // ??
}
void lyxstring::insert(iterator p, size_type n , value_type c)
{
TestlyxstringInvariant(this);
insert(p - begin(), n , c);
}
void lyxstring::insert(iterator p, iterator first, iterator last)
{
TestlyxstringInvariant(this);
insert(p - begin(), first, last - first);
}
////////////////
// Find
////////////////
// All the below find functions should be verified,
// it is very likely that I have mixed up or interpreted
// some of the parameters wrong, also some of the funcs can surely
// be written more effectively.
lyxstring::size_type lyxstring::find(lyxstring const & a, size_type i) const
{
if (!rep->sz || i >= rep->sz) return npos;
TestlyxstringInvariant(this);
size_type n = a.length();
if (!n) return npos;
for (size_type t = i; rep->sz - t >= n; ++t) {
// search until (*this)[i] == a[0]
if (rep->s[t] == a[0]) {
// check if the rest of the value_types match
bool equal = true;
for (size_type j = 1; j < n; ++j) {
if (rep->s[t + j] != a[j]) {
equal = false;
break;
}
}
if (equal) return t;
}
}
return npos;
}
lyxstring::size_type lyxstring::find(value_type const * ptr, size_type i,
size_type n) const
{
lyx::Assert(ptr); // OURS!
if (!rep->sz || !*ptr || i >= rep->sz) return npos;
TestlyxstringInvariant(this);
// What is "n" here? is it the number of value_types to use in ptr
// or does "i" and "n" togeter form a substring to search
// for ptr in? For now I will assume that "n" tells the length
// of ptr. (Lgb)
n = min(n, strlen(ptr));
if (!n) return npos;
for (size_type t = i; rep->sz - t >= n; ++t) {
// search until (*this)[i] == a[0]
if (rep->s[t] == ptr[0]) {
// check if the rest of the value_types match
bool equal = true;
for (size_type j = 1; j < n; ++j) {
if (rep->s[t + j] != ptr[j]) {
equal = false;
break;
}
}
if (equal) return t;
}
}
return npos;
}
lyxstring::size_type lyxstring::find(value_type const * s, size_type i) const
{
lyx::Assert(s); // OURS!
if (!rep->sz || i >= rep->sz) return npos;
TestlyxstringInvariant(this);
if (!s || !*s) return npos;
return find(s, i, strlen(s));
}
lyxstring::size_type lyxstring::find(value_type c, size_type i) const
{
if (!rep->sz || i >= rep->sz) return npos;
TestlyxstringInvariant(this);
for (size_type t = 0; t + i < rep->sz; ++t) {
if (rep->s[t + i] == c) return t + i;
}
return npos;
}
lyxstring::size_type lyxstring::rfind(lyxstring const & a, size_type i) const
{
TestlyxstringInvariant(this);
size_type n = a.length();
if (!n || rep->sz < n)
return npos;
size_type t = min(rep->sz - n, i);
do {
if (rep->s[t] == a[0]) {
// check if the rest of the value_types match
bool equal = true;
for (size_type j = 1; j < n; ++j) {
if (rep->s[t + j] != a[j]) {
equal = false;
break;
}
}
if (equal) return t;
}
} while (t-- > 0);
return npos;
}
lyxstring::size_type lyxstring::rfind(value_type const * ptr, size_type i,
size_type n) const
{
lyx::Assert(ptr); // OURS!
TestlyxstringInvariant(this);
n = min(n, strlen(ptr));
if (!n || rep->sz < n)
return npos;
size_type t = min(rep->sz - n, i);
do {
if (rep->s[t] == ptr[0]) {
// check if the rest of the value_types match
bool equal = true;
for (size_type j = 1; j < n; ++j) {
if (rep->s[t + j] != ptr[j]) {
equal = false;
break;
}
}
if (equal) return t;
}
} while (t-- > 0);
return npos;
}
lyxstring::size_type lyxstring::rfind(value_type const * ptr,
size_type i) const
{
lyx::Assert(ptr); // OURS!
if (!ptr || !*ptr) return npos;
return rfind(ptr, i, strlen(ptr));
}
lyxstring::size_type lyxstring::rfind(value_type c, size_type i) const
{
TestlyxstringInvariant(this);
size_type const sz = rep->sz;
if (sz < 1) return npos;
size_type ii = min(sz - 1, i);
do {
if (rep->s[ii] == c) return ii;
} while (ii-- > 0);
return npos;
}
lyxstring::size_type lyxstring::find_first_of(lyxstring const & a,
size_type i) const
{
lyx::Assert(i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
for (size_type t = i; t < rep->sz; ++t) {
if (a.find(rep->s[t]) != npos) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_first_of(value_type const * ptr,
size_type i,
size_type n) const
{
lyx::Assert(ptr && i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
if (!n) return npos;
for (size_type t = i; t < rep->sz; ++t) {
if (memchr(ptr, rep->s[t], n) != 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_first_of(value_type const * ptr,
size_type i) const
{
lyx::Assert(ptr && i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
for (size_type t = i; t < rep->sz; ++t) {
if (strchr(ptr, rep->s[t]) != 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_first_of(value_type c, size_type i) const
{
lyx::Assert(i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
for (size_type t = i; t < rep->sz; ++t) {
if (rep->s[t] == c) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_of(lyxstring const & a,
size_type i) const
{
TestlyxstringInvariant(this);
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (a.find(rep->s[t]) != npos) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_of(value_type const * ptr,
size_type i,
size_type n) const
{
lyx::Assert(ptr); // OURS!
TestlyxstringInvariant(this);
if (!n) return npos;
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (memchr(ptr, rep->s[t], n) != 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_of(value_type const * ptr,
size_type i) const
{
lyx::Assert(ptr); // OURS!
TestlyxstringInvariant(this);
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (strchr(ptr, rep->s[t]) != 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_of(value_type c, size_type i) const
{
TestlyxstringInvariant(this);
if (!rep->sz) return npos;
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (rep->s[t] == c) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_first_not_of(lyxstring const & a,
size_type i) const
{
TestlyxstringInvariant(this);
if (!rep->sz) return npos;
lyx::Assert(i <= rep->sz);
for (size_type t = i; t < rep->sz; ++t) {
if (a.find(rep->s[t]) == npos) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_first_not_of(value_type const * ptr,
size_type i,
size_type n) const
{
lyx::Assert(ptr && i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
if (!n) return (i < rep->sz) ? i : npos;
for (size_type t = i; t < rep->sz; ++t) {
if (memchr(ptr, rep->s[t], n) == 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_first_not_of(value_type const * ptr,
size_type i) const
{
lyx::Assert(ptr && i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
for (size_type t = i; t < rep->sz; ++t) {
if (strchr(ptr, rep->s[t]) == 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_first_not_of(value_type c,
size_type i) const
{
if (!rep->sz) return npos;
lyx::Assert(i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
for (size_type t = i; t < rep->sz; ++t) {
if (rep->s[t] != c) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_not_of(lyxstring const & a,
size_type i) const
{
TestlyxstringInvariant(this);
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (a.find(rep->s[t]) == npos) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_not_of(value_type const * ptr,
size_type i,
size_type n) const
{
lyx::Assert(ptr); // OURS!
TestlyxstringInvariant(this);
if (!n) return npos;
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (memchr(ptr, rep->s[t], n) == 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_not_of(value_type const * ptr,
size_type i) const
{
lyx::Assert(ptr); // OURS!
TestlyxstringInvariant(this);
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (strchr(ptr, rep->s[t]) == 0) return t;
}
return npos;
}
lyxstring::size_type lyxstring::find_last_not_of(value_type c,
size_type i) const
{
TestlyxstringInvariant(this);
size_type ii = min(rep->sz - 1, i);
for (int t = ii; t >= 0; --t) {
if (rep->s[t] != c) return t;
}
return npos;
}
/////////////////
// Replace
/////////////////
lyxstring & lyxstring::replace(size_type i, size_type n, lyxstring const & x)
{
lyx::Assert(i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
return replace(i, n, x, 0, x.rep->sz);
}
lyxstring & lyxstring::replace(size_type i, size_type n, lyxstring const & x,
size_type i2, size_type n2)
{
lyx::Assert(i <= rep->sz && i2 <= x.rep->sz); // STD!
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->replace(i, min(n, rep->sz), &(x.rep->s[i2]), min(n2, x.rep->sz));
return *this;
}
lyxstring & lyxstring::replace(size_type i, size_type n,
value_type const * p, size_type n2)
{
lyx::Assert(p && i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
rep->replace(i, min(n, rep->sz), p, min(n2, strlen(p)));
return *this;
}
lyxstring & lyxstring::replace(size_type i, size_type n, value_type const * p)
{
lyx::Assert(p && i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
return replace(i, min(n, rep->sz), p, (!p) ? 0 : strlen(p));
}
lyxstring & lyxstring::replace(size_type i, size_type n,
size_type n2, value_type c)
{
lyx::Assert(i <= rep->sz); // OURS!
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
value_type * tmp = new value_type[n2];
memset(tmp, c, n2);
rep->replace(i, min(n, rep->sz), tmp, n2);
delete[] tmp;
return *this;
}
/// FY! FY! FY! go away !
lyxstring & lyxstring::replace(size_type i, size_type n, value_type c)
{
return replace(i, n, 1, c);
}
lyxstring & lyxstring::replace(iterator i, iterator i2, const lyxstring & str)
{
TestlyxstringInvariant(this);
return replace(i - begin(), i2 - i, str);
}
lyxstring & lyxstring::replace(iterator i, iterator i2,
value_type const * p, size_type n)
{
lyx::Assert(p); // OURS!
TestlyxstringInvariant(this);
return replace(i - begin(), i2 - i, p, n);
}
lyxstring & lyxstring::replace(iterator i, iterator i2, value_type const * p)
{
lyx::Assert(p); // OURS!
TestlyxstringInvariant(this);
return replace(i - begin(), i2 - i, p);
}
lyxstring & lyxstring::replace(iterator i, iterator i2,
size_type n , value_type c)
{
TestlyxstringInvariant(this);
return replace(i - begin(), i2 - i, n, c);
}
lyxstring & lyxstring::replace(iterator i, iterator i2,
iterator j, iterator j2)
{
TestlyxstringInvariant(this);
return replace(i - begin(), i2 - i, j, j2 - j);
}
void lyxstring::swap(lyxstring & str)
{
if (rep == str.rep) return;
Srep * tmp = str.rep;
str.rep = rep;
rep = tmp;
}
lyxstring & lyxstring::erase(size_type i, size_type n)
{
lyx::Assert(i <= rep->sz); // STD!
TestlyxstringInvariant(this);
rep = rep->get_own_copy();
if (i == 0 && n >= rep->sz) {
rep->sz = 0;
} else {
n = min(n, rep->sz - i);
memmove(&(rep->s[i]), &(rep->s[i + n]), rep->sz - i - n);
rep->sz -= n;
}
return *this;
}
lyxstring::iterator lyxstring::erase(iterator i)
{
TestlyxstringInvariant(this);
// what iterator is this supposed to return?
// the iterator after the one erased
erase(i - begin(), 1);
return begin(); // BUG
}
lyxstring::iterator lyxstring::erase(iterator first, iterator last)
{
TestlyxstringInvariant(this);
erase(first - begin(), last - first);
return begin(); // BUG
}
/////////////////////////////////////
// Conversion to C-style Strings
/////////////////////////////////////
lyxstring::value_type const * lyxstring::c_str() const
{
rep->s[length()] = '\0';
return rep->s;
}
lyxstring::value_type const * lyxstring::data() const
{
return rep->s;
}
lyxstring::size_type lyxstring::copy(value_type * buf, size_type len,
size_type pos) const
{
lyx::Assert(buf); // OURS!
lyx::Assert(pos <= rep->sz); // STD!
TestlyxstringInvariant(this);
register int nn = min(len, length() - pos);
memcpy(buf, &(rep->s[pos]), nn);
return nn;
}
////////////////////
// Comparisons
////////////////////
// Compare funcs should be verified.
int lyxstring::internal_compare(size_type pos, size_type n,
value_type const * s,
size_type slen, size_type n2) const
{
if ((rep->sz == 0 || n == 0) && (!*s || n2 == 0)) return 0;
if (!*s) return 1;
// since n > n2, min(n, n2) == 0, c == 0 (stops segfault also)
// remember that n can very well be a lot larger than rep->sz
// so we have to ensure that n is no larger than rep->sz
n = min(n, rep->sz);
n2 = min(n2, slen);
if (n == n2)
return memcmp(&(rep->s[pos]), s, n);
int c = memcmp(&(rep->s[pos]), s, min(n, n2));
if (c)
return c;
if (n < n2)
return -1;
return 1;
}
int lyxstring::compare(lyxstring const & str) const
{
TestlyxstringInvariant(this);
return internal_compare(0, rep->sz, str.rep->s,
str.rep->sz, str.rep->sz);
}
int lyxstring::compare(value_type const * s) const
{
lyx::Assert(s); //OURS!
TestlyxstringInvariant(this);
int n = (!s) ? 0 : strlen(s);
return internal_compare(0, rep->sz, s, n, n);
}
int lyxstring::compare(size_type pos, size_type n,
lyxstring const & str) const
{
lyx::Assert(pos <= rep->sz); // OURS!
TestlyxstringInvariant(this);
return internal_compare(pos, n, str.rep->s, str.rep->sz, str.rep->sz);
}
int lyxstring::compare(size_type pos, size_type n, lyxstring const & str,
size_type pos2, size_type n2) const
{
lyx::Assert(pos <= rep->sz); // OURS!
lyx::Assert(pos2 <= str.rep->sz); // OURS!
TestlyxstringInvariant(this);
return internal_compare(pos, n,
str.rep->s + pos2,
str.rep->sz - pos2, n2);
}
int lyxstring::compare(size_type pos, size_type n, value_type const * s,
size_type n2) const
{
lyx::Assert(s && pos <= rep->sz); // OURS!
TestlyxstringInvariant(this);
return internal_compare(pos, n, s, (!s) ? 0 : strlen(s), n2);
}
/////////////////
// Substrings
/////////////////
// i = index, n = length
lyxstring lyxstring::substr(size_type i, size_type n) const
{
lyx::Assert(i <= rep->sz); // STD!
TestlyxstringInvariant(this);
return lyxstring(*this, i, n);
}
/////////////////////////////////////////////
// String operators, non member functions
/////////////////////////////////////////////
bool operator==(lyxstring const & a, lyxstring const & b)
{
return a.compare(b) == 0;
}
bool operator==(lyxstring::value_type const * a, lyxstring const & b)
{
lyx::Assert(a); // OURS!
return b.compare(a) == 0;
}
bool operator==(lyxstring const & a, lyxstring::value_type const * b)
{
lyx::Assert(b); // OURS!
return a.compare(b) == 0;
}
bool operator!=(lyxstring const & a, lyxstring const & b)
{
return a.compare(b) != 0;
}
bool operator!=(lyxstring::value_type const * a, lyxstring const & b)
{
lyx::Assert(a); // OURS!
return b.compare(a) != 0;
}
bool operator!=(lyxstring const & a, lyxstring::value_type const * b)
{
lyx::Assert(b); // OURS!
return a.compare(b) != 0;
}
bool operator>(lyxstring const & a, lyxstring const & b)
{
return a.compare(b) > 0;
}
bool operator>(lyxstring::value_type const * a, lyxstring const & b)
{
lyx::Assert(a); // OURS!
return b.compare(a) < 0; // since we reverse the parameters
}
bool operator>(lyxstring const & a, lyxstring::value_type const * b)
{
lyx::Assert(b); // OURS!
return a.compare(b) > 0;
}
bool operator<(lyxstring const & a, lyxstring const & b)
{
return a.compare(b) < 0;
}
bool operator<(lyxstring::value_type const * a, lyxstring const & b)
{
lyx::Assert(a); // OURS!
return b.compare(a) > 0; // since we reverse the parameters
}
bool operator<(lyxstring const & a, lyxstring::value_type const * b)
{
lyx::Assert(b); // OURS!
return a.compare(b) < 0;
}
bool operator>=(lyxstring const & a, lyxstring const & b)
{
return a.compare(b) >= 0;
}
bool operator>=(lyxstring::value_type const * a, lyxstring const & b)
{
lyx::Assert(a); // OURS!
return b.compare(a) <= 0; // since we reverse the parameters
}
bool operator>=(lyxstring const & a, lyxstring::value_type const * b)
{
lyx::Assert(b); // OURS!
return a.compare(b) >= 0;
}
bool operator<=(lyxstring const & a, lyxstring const & b)
{
return a.compare(b) <= 0;
}
bool operator<=(lyxstring::value_type const * a, lyxstring const & b)
{
lyx::Assert(a); // OURS!
return b.compare(a) >= 0; // since we reverse the parameters
}
bool operator<=(lyxstring const & a, lyxstring::value_type const * b)
{
lyx::Assert(b); // OURS!
return a.compare(b) <= 0;
}
lyxstring operator+(lyxstring const & a, lyxstring const & b)
{
lyxstring tmp(a);
tmp += b;
return tmp;
}
lyxstring operator+(lyxstring::value_type const * a, lyxstring const & b)
{
lyx::Assert(a); // OURS!
lyxstring tmp(a);
tmp += b;
return tmp;
}
lyxstring operator+(lyxstring::value_type a, lyxstring const & b)
{
lyxstring tmp;
tmp += a;
tmp += b;
return tmp;
}
lyxstring operator+(lyxstring const & a, lyxstring::value_type const * b)
{
lyx::Assert(b); // OURS!
lyxstring tmp(a);
tmp += b;
return tmp;
}
lyxstring operator+(lyxstring const & a, lyxstring::value_type b)
{
lyxstring tmp(a);
tmp += b;
return tmp;
}
void swap(lyxstring & str1, lyxstring & str2)
{
str1.swap(str2);
}
#include <iostream>
istream & operator>>(istream & is, lyxstring & s)
{
#if 0
// very bad solution
char * nome = new char[1024];
is >> nome;
lyxstring tmp(nome);
delete [] nome;
if (!tmp.empty()) s = tmp;
#else
// better solution
int w = is.width(0);
s.clear();
char c = 0;
bool skipspace = true;
while (is.get(c)) {
if (isspace(c)) {
if (!skipspace) {
is.putback(c);
break;
}
} else {
s += c;
skipspace = false;
}
if (--w == 1) break;
}
if (s.empty()) is.setstate(std::ios::failbit);
#endif
return is;
}
ostream & operator<<(ostream & o, lyxstring const & s)
{
return o.write(s.data(), s.length());
}
istream & getline(istream & is, lyxstring & s,
lyxstring::value_type delim)
{
// very bad solution
char tmp = 0;
s.erase();
while (is) {
is.get(tmp);
if (tmp != delim) {
s += tmp;
} else {
break;
}
}
return is;
}
#ifdef TEST_MAIN
int main() {
lyxstring a = "abcac";
cout << a.rfind("ab") << endl;
cout << a.rfind("c") << endl;
cout << a.rfind("d") << endl;
}
#endif