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gcc/libstdc++/stl/ropeimpl.h
Jason Merrill ff893307d0 algo.h, [...]: Update To September 8 SGI release. 
* algo.h, algobase.h, alloc.h, bvector.h, deque.h, hashtable.h,
	iterator.h, list.h, rope.h, ropeimpl.h, slist.h, stl_config.h,
	tree.h, vector.h: Update To September 8 SGI release.

From-SVN: r15211
1997-09-09 22:49:45 -04:00

1502 lines
42 KiB
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/*
* Copyright (c) 1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
# include <stdio.h>
# include <iostream.h>
// Set buf_start, buf_end, and buf_ptr appropriately, filling tmp_buf
// if necessary. Assumes path_end[leaf_index] and leaf_pos are correct.
// Results in a valid buf_ptr if the iterator can be legitimately
// dereferenced.
template <class charT, class Alloc>
void __rope_iterator_base<charT,Alloc>::setbuf
(__rope_iterator_base<charT,Alloc> &x)
{
const RopeBase * leaf = x.path_end[x.leaf_index];
size_t leaf_pos = x.leaf_pos;
size_t pos = x.current_pos;
switch(leaf -> tag) {
case RopeBase::leaf:
x.buf_start = ((__rope_RopeLeaf<charT,Alloc> *)leaf) -> data;
x.buf_ptr = x.buf_start + (pos - leaf_pos);
x.buf_end = x.buf_start + leaf -> size;
break;
case RopeBase::function:
case RopeBase::substringfn:
{
size_t len = iterator_buf_len;
size_t buf_start_pos = leaf_pos;
size_t leaf_end = leaf_pos + leaf -> size;
char_producer<charT> *fn =
((__rope_RopeFunction<charT,Alloc> *)leaf) -> fn;
if (buf_start_pos + len <= pos) {
buf_start_pos = pos - len/4;
if (buf_start_pos + len > leaf_end) {
buf_start_pos = leaf_end - len;
}
}
if (buf_start_pos + len > leaf_end) {
len = leaf_end - buf_start_pos;
}
(*fn)(buf_start_pos - leaf_pos, len, x.tmp_buf);
x.buf_ptr = x.tmp_buf + (pos - buf_start_pos);
x.buf_start = x.tmp_buf;
x.buf_end = x.tmp_buf + len;
}
break;
default:
__stl_assert(0);
}
}
// Set path and buffer inside a rope iterator. We assume that
// pos and root are already set.
template <class charT, class Alloc>
void __rope_iterator_base<charT,Alloc>::setcache
(__rope_iterator_base<charT,Alloc> &x)
{
const RopeBase * path[RopeBase::max_rope_depth+1];
const RopeBase * curr_rope;
int curr_depth = -1; /* index into path */
size_t curr_start_pos = 0;
size_t pos = x.current_pos;
unsigned char dirns = 0; // Bit vector indicating right turns in the path
__stl_assert(pos <= x.root -> size);
if (pos >= x.root -> size) {
x.buf_ptr = 0;
return;
}
curr_rope = x.root;
if (0 != curr_rope -> c_string) {
/* Treat the root as a leaf. */
x.buf_start = curr_rope -> c_string;
x.buf_end = curr_rope -> c_string + curr_rope -> size;
x.buf_ptr = curr_rope -> c_string + pos;
x.path_end[0] = curr_rope;
x.leaf_index = 0;
x.leaf_pos = 0;
return;
}
for(;;) {
++curr_depth;
__stl_assert(curr_depth <= RopeBase::max_rope_depth);
path[curr_depth] = curr_rope;
switch(curr_rope -> tag) {
case RopeBase::leaf:
case RopeBase::function:
case RopeBase::substringfn:
x.leaf_pos = curr_start_pos;
goto done;
case RopeBase::concat:
{
__rope_RopeConcatenation<charT,Alloc> *c =
(__rope_RopeConcatenation<charT,Alloc> *)curr_rope;
RopeBase * left = c -> left;
size_t left_len = left -> size;
dirns <<= 1;
if (pos >= curr_start_pos + left_len) {
dirns |= 1;
curr_rope = c -> right;
curr_start_pos += left_len;
} else {
curr_rope = left;
}
}
break;
}
}
done:
// Copy last section of path into path_end.
{
int i = -1;
int j = curr_depth + 1 - path_cache_len;
if (j < 0) j = 0;
while (j <= curr_depth) {
x.path_end[++i] = path[j++];
}
x.leaf_index = i;
}
x.path_directions = dirns;
setbuf(x);
}
// Specialized version of the above. Assumes that
// the path cache is valid for the previous position.
template <class charT, class Alloc>
void __rope_iterator_base<charT,Alloc>::setcache_for_incr
(__rope_iterator_base<charT,Alloc> &x)
{
int current_index = x.leaf_index;
const RopeBase * current_node = x.path_end[current_index];
size_t len = current_node -> size;
size_t node_start_pos = x.leaf_pos;
unsigned char dirns = x.path_directions;
__rope_RopeConcatenation<charT,Alloc> * c;
__stl_assert(x.current_pos <= x.root -> size);
if (x.current_pos - node_start_pos < len) {
/* More stuff in this leaf, we just didn't cache it. */
setbuf(x);
return;
}
__stl_assert(node_start_pos + len == x.current_pos);
// node_start_pos is starting position of last_node.
while (--current_index >= 0) {
if (!(dirns & 1) /* Path turned left */) break;
current_node = x.path_end[current_index];
c = (__rope_RopeConcatenation<charT,Alloc> *)current_node;
// Otherwise we were in the right child. Thus we should pop
// the concatenation node.
node_start_pos -= c -> left -> size;
dirns >>= 1;
}
if (current_index < 0) {
// We underflowed the cache. Punt.
setcache(x);
return;
}
current_node = x.path_end[current_index];
c = (__rope_RopeConcatenation<charT,Alloc> *)current_node;
// current_node is a concatenation node. We are positioned on the first
// character in its right child.
// node_start_pos is starting position of current_node.
node_start_pos += c -> left -> size;
current_node = c -> right;
x.path_end[++current_index] = current_node;
dirns |= 1;
while (RopeBase::concat == current_node -> tag) {
++current_index;
if (path_cache_len == current_index) {
int i;
for (i = 0; i < path_cache_len-1; i++) {
x.path_end[i] = x.path_end[i+1];
}
--current_index;
}
current_node =
((__rope_RopeConcatenation<charT,Alloc> *)current_node) -> left;
x.path_end[current_index] = current_node;
dirns <<= 1;
// node_start_pos is unchanged.
}
x.leaf_index = current_index;
x.leaf_pos = node_start_pos;
x.path_directions = dirns;
setbuf(x);
}
template <class charT, class Alloc>
void __rope_iterator_base<charT,Alloc>::incr(size_t n) {
current_pos += n;
if (0 != buf_ptr) {
size_t chars_left = buf_end - buf_ptr;
if (chars_left > n) {
buf_ptr += n;
} else if (chars_left == n) {
buf_ptr += n;
setcache_for_incr(*this);
} else {
buf_ptr = 0;
}
}
}
template <class charT, class Alloc>
void __rope_iterator_base<charT,Alloc>::decr(size_t n) {
if (0 != buf_ptr) {
size_t chars_left = buf_ptr - buf_start;
if (chars_left >= n) {
buf_ptr -= n;
} else {
buf_ptr = 0;
}
}
current_pos -= n;
}
template <class charT, class Alloc>
void __rope_iterator<charT,Alloc>::check() {
if (root_rope -> tree_ptr != root) {
// Rope was modified. Get things fixed up.
RopeBase::unref(root);
root = root_rope -> tree_ptr;
RopeBase::ref(root);
buf_ptr = 0;
}
}
template <class charT, class Alloc>
inline __rope_const_iterator<charT, Alloc>::__rope_const_iterator
(const __rope_iterator<charT,Alloc> & x)
: __rope_iterator_base<charT,Alloc>(x) { }
template <class charT, class Alloc>
inline __rope_iterator<charT,Alloc>::__rope_iterator
(rope<charT,Alloc>& r, size_t pos)
: __rope_iterator_base<charT,Alloc>(r.tree_ptr, pos), root_rope(&r) {
RopeBase::ref(root);
}
template <class charT, class Alloc>
inline size_t rope<charT,Alloc>::char_ptr_len(const charT *s)
{
const charT *p = s;
while (!is0(*p)) { ++p; }
return(p - s);
}
template <class charT, class Alloc>
rope<charT,Alloc>::RopeLeaf *
rope<charT,Alloc>::RopeLeaf_from_char_ptr(__GC_CONST charT *s, size_t size)
{
RopeLeaf *t = LAlloc::allocate();
t -> tag = RopeBase::leaf;
if (__is_basic_char_type((charT *)0)) {
// already eos terminated.
t -> c_string = s;
} else {
t -> c_string = 0;
}
t -> is_balanced = true;
t -> depth = 0;
t -> size = size;
t -> data = s;
# ifndef __GC
t -> refcount = 1;
t -> init_refcount_lock();
# endif
return (t);
}
# ifdef __GC
template <class charT, class Alloc>
void __rope_RopeBase<charT,Alloc>::fn_finalization_proc(void * tree, void *)
{
delete ((__rope_RopeFunction<charT,Alloc> *)tree) -> fn;
}
# endif
template <class charT, class Alloc>
rope<charT,Alloc>::RopeFunction *
rope<charT,Alloc>::RopeFunction_from_fn
(char_producer<charT> *fn, size_t size, bool delete_fn)
{
if (0 == size) return 0;
RopeFunction *t = FAlloc::allocate();
t -> tag = RopeBase::function;
t -> c_string = 0;
t -> is_balanced = true;
t -> depth = 0;
t -> size = size;
t -> fn = fn;
# ifdef __GC
if (delete_fn) {
GC_REGISTER_FINALIZER(t, RopeBase::fn_finalization_proc, 0, 0, 0);
}
# else
t -> delete_when_done = delete_fn;
t -> refcount = 1;
t -> init_refcount_lock();
# endif
return (t);
}
#ifndef __GC
template <class charT, class Alloc>
inline void __rope_RopeBase<charT,Alloc>::free_c_string()
{
charT * cstr = c_string;
if (0 != cstr) {
size_t sz = size + 1;
destroy(cstr, cstr + sz);
DataAlloc::deallocate(cstr, sz);
}
}
template <class charT, class Alloc>
inline void __rope_RopeBase<charT,Alloc>::free_string(charT* s, size_t n)
{
if (!__is_basic_char_type((charT *)0)) {
destroy(s, s + n);
}
DataAlloc::deallocate(s, rounded_up_size(n));
}
template <class charT, class Alloc>
void __rope_RopeBase<charT,Alloc>::free_tree()
{
switch(tag) {
case leaf:
{
__rope_RopeLeaf<charT,Alloc> * l =
(__rope_RopeLeaf<charT,Alloc> *)this;
charT * d = l -> data;
if (d != c_string) {
free_c_string();
}
free_string(d, size);
LAlloc::deallocate(l);
}
break;
case concat:
{
__rope_RopeConcatenation<charT,Alloc> * c =
(__rope_RopeConcatenation<charT,Alloc> *)this;
__rope_RopeBase * left = c -> left;
__rope_RopeBase * right = c -> right;
free_c_string();
left -> unref_nonnil();
right -> unref_nonnil();
CAlloc::deallocate(c);
}
break;
case function:
{
__rope_RopeFunction<charT,Alloc> * fn =
(__rope_RopeFunction<charT,Alloc> *)this;
free_c_string();
if ( fn -> delete_when_done) {
delete fn -> fn;
}
FAlloc::deallocate(fn);
break;
}
case substringfn:
{
__rope_RopeSubstring<charT,Alloc> * ss =
(__rope_RopeSubstring<charT,Alloc> *)this;
__rope_RopeBase *base = ss -> base;
free_c_string();
base -> unref_nonnil();
SAlloc::deallocate(ss);
break;
}
}
}
#else
template <class charT, class Alloc>
inline void __rope_RopeBase<charT,Alloc>::free_string(charT* s, size_t n)
{}
#endif
// Concatenate a C string onto a leaf rope by copying the rope data.
// Used for short ropes.
template <class charT, class Alloc>
rope<charT,Alloc>::RopeLeaf *
rope<charT,Alloc>::leaf_concat_char_iter
(RopeLeaf * r, const charT * iter, size_t len)
{
size_t old_len = r -> size;
charT * new_data = (charT *)
DataAlloc::allocate(rounded_up_size(old_len + len));
RopeLeaf * result;
uninitialized_copy_n(r -> data, old_len, new_data);
uninitialized_copy_n(iter, len, new_data + old_len);
__cond_store_eos(new_data[old_len + len]);
__STL_TRY
result = RopeLeaf_from_char_ptr(new_data, old_len + len);
__STL_UNWIND(RopeBase::free_string(new_data, old_len + len));
return result;
}
#ifndef __GC
// As above, but it's OK to clobber original if refcount is 1
template <class charT, class Alloc>
rope<charT,Alloc>::RopeLeaf *
rope<charT,Alloc>::destr_leaf_concat_char_iter
(RopeLeaf * r, const charT * iter, size_t len)
{
__stl_assert(r -> refcount >= 1);
if (r -> refcount > 1) return leaf_concat_char_iter(r, iter, len);
size_t old_len = r -> size;
if (allocated_capacity(old_len) >= old_len + len) {
// The space has been partially initialized for the standard
// character types. But that doesn't matter for those types.
uninitialized_copy_n(iter, len, r -> data + old_len);
if (__is_basic_char_type((charT *)0)) {
__cond_store_eos(r -> data[old_len + len]);
__stl_assert(r -> c_string == r -> data);
} else if (r -> c_string != r -> data && 0 != r -> c_string) {
r -> free_c_string();
r -> c_string = 0;
}
r -> size = old_len + len;
__stl_assert(r -> refcount == 1);
r -> refcount = 2;
return r;
} else {
RopeLeaf * result = leaf_concat_char_iter(r, iter, len);
__stl_assert(result -> refcount == 1);
return result;
}
}
#endif
// Assumes left and right are not 0.
// Does not increment (nor decrement on exception) child reference counts.
// Result has ref count 1.
template <class charT, class Alloc>
rope<charT,Alloc>::RopeBase *
rope<charT,Alloc>::tree_concat (RopeBase * left, RopeBase * right)
{
RopeConcatenation * result = CAlloc::allocate();
unsigned char child_depth = left -> depth;
size_t rsize;
result -> tag = RopeBase::concat;
result -> c_string = 0;
result -> is_balanced = false;
result -> size = rsize = left -> size + right -> size;
if (right -> depth > child_depth) child_depth = right -> depth;
unsigned char depth = (unsigned char)(child_depth + 1);
result -> depth = depth;
result -> left = left;
result -> right = right;
# ifndef __GC
result -> refcount = 1;
result -> init_refcount_lock();
# endif
if (depth > 20 && (rsize < 1000 || depth > RopeBase::max_rope_depth)) {
RopeBase * balanced;
__STL_TRY
balanced = balance(result);
# ifndef __GC
if (result != balanced) {
__stl_assert(1 == result -> refcount
&& 1 == balanced -> refcount);
}
# endif
result -> unref_nonnil();
__STL_UNWIND(CAlloc::deallocate(result));
// In case of exception, we need to deallocate
// otherwise dangling result node. But caller
// still owns its children. Thus unref is
// inappropriate.
return balanced;
} else {
return result;
}
}
template <class charT, class Alloc>
rope<charT,Alloc>::RopeBase * rope<charT,Alloc>::concat_char_iter
(RopeBase * r, const charT *s, size_t slen)
{
RopeBase *result;
if (0 == slen) {
ref(r);
return r;
}
if (0 == r) return RopeLeaf_from_unowned_char_ptr(s, slen);
if (RopeBase::leaf == r -> tag && r -> size + slen <= copy_max) {
result = leaf_concat_char_iter((RopeLeaf *)r, s, slen);
# ifndef __GC
__stl_assert(1 == result -> refcount);
# endif
return result;
}
if (RopeBase::concat == r -> tag
&& RopeBase::leaf == ((RopeConcatenation *)r) -> right -> tag) {
RopeLeaf *right = (RopeLeaf *)(((RopeConcatenation *)r) -> right);
if (right -> size + slen <= copy_max) {
RopeBase * left = ((RopeConcatenation *)r) -> left;
RopeBase * nright = leaf_concat_char_iter((RopeLeaf *)right, s, slen);
left -> ref_nonnil();
__STL_TRY
result = tree_concat(left, nright);
__STL_UNWIND(unref(left); unref(nright));
# ifndef __GC
__stl_assert(1 == result -> refcount);
# endif
return result;
}
}
RopeBase * nright = RopeLeaf_from_unowned_char_ptr(s, slen);
__STL_TRY
r -> ref_nonnil();
result = tree_concat(r, nright);
__STL_UNWIND(unref(r); unref(nright));
# ifndef __GC
__stl_assert(1 == result -> refcount);
# endif
return result;
}
#ifndef __GC
template <class charT, class Alloc>
rope<charT,Alloc>::RopeBase * rope<charT,Alloc>
::destr_concat_char_iter
(RopeBase * r, const charT *s, size_t slen)
{
RopeBase *result;
if (0 == r) return RopeLeaf_from_unowned_char_ptr(s, slen);
size_t count = r -> refcount;
size_t orig_size = r -> size;
__stl_assert(count >= 1);
if (count > 1) return concat_char_iter(r, s, slen);
if (0 == slen) {
r -> refcount = 2; // One more than before
return r;
}
if (orig_size + slen <= copy_max && RopeBase::leaf == r -> tag) {
result = destr_leaf_concat_char_iter((RopeLeaf *)r, s, slen);
return result;
}
if (RopeBase::concat == r -> tag) {
RopeLeaf *right = (RopeLeaf *)(((RopeConcatenation *)r) -> right);
if (RopeBase::leaf == right -> tag
&& right -> size + slen <= copy_max) {
RopeBase * new_right = destr_leaf_concat_char_iter(right, s, slen);
if (right == new_right) {
__stl_assert(new_right -> refcount == 2);
new_right -> refcount = 1;
} else {
__stl_assert(new_right -> refcount >= 1);
right -> unref_nonnil();
}
__stl_assert(r -> refcount == 1);
r -> refcount = 2; // One more than before.
((RopeConcatenation *)r) -> right = new_right;
r -> size = orig_size + slen;
if (0 != r -> c_string) {
r -> free_c_string();
r -> c_string = 0;
}
return r;
}
}
RopeBase *right = RopeLeaf_from_unowned_char_ptr(s, slen);
r -> ref_nonnil();
__STL_TRY
result = tree_concat(r, right);
__STL_UNWIND(unref(r); unref(right))
__stl_assert(1 == result -> refcount);
return result;
}
#endif /* !__GC */
template <class charT, class Alloc>
rope<charT,Alloc>::RopeBase *
rope<charT,Alloc>::concat(RopeBase * left, RopeBase * right)
{
if (0 == left) {
ref(right);
return right;
}
if (0 == right) {
left -> ref_nonnil();
return left;
}
if (RopeBase::leaf == right -> tag) {
if (RopeBase::leaf == left -> tag) {
if (right -> size + left -> size <= copy_max) {
return leaf_concat_char_iter((RopeLeaf *)left,
((RopeLeaf *)right) -> data,
right -> size);
}
} else if (RopeBase::concat == left -> tag
&& RopeBase::leaf ==
((RopeConcatenation *)left) -> right -> tag) {
RopeLeaf * leftright =
(RopeLeaf *)(((RopeConcatenation *)left) -> right);
if (leftright -> size + right -> size <= copy_max) {
RopeBase * leftleft = ((RopeConcatenation *)left) -> left;
RopeBase * rest = leaf_concat_char_iter(leftright,
((RopeLeaf *)right) -> data,
right -> size);
leftleft -> ref_nonnil();
__STL_TRY
return(tree_concat(leftleft, rest));
__STL_UNWIND(unref(leftleft); unref(rest))
}
}
}
left -> ref_nonnil();
right -> ref_nonnil();
__STL_TRY
return(tree_concat(left, right));
__STL_UNWIND(unref(left); unref(right));
}
template <class charT, class Alloc>
rope<charT,Alloc>::RopeBase *
rope<charT,Alloc>::substring(RopeBase * base, size_t start, size_t endp1)
{
if (0 == base) return 0;
size_t len = base -> size;
size_t adj_endp1;
const size_t lazy_threshold = 128;
if (endp1 >= len) {
if (0 == start) {
base -> ref_nonnil();
return base;
} else {
adj_endp1 = len;
}
} else {
adj_endp1 = endp1;
}
switch(base -> tag) {
case RopeBase::concat:
{
RopeConcatenation *c = (RopeConcatenation *)base;
RopeBase *left = c -> left;
RopeBase *right = c -> right;
size_t left_len = left -> size;
RopeBase * result;
if (adj_endp1 <= left_len) {
return substring(left, start, endp1);
} else if (start >= left_len) {
return substring(right, start - left_len,
adj_endp1 - left_len);
}
self_destruct_ptr left_result(substring(left, start,
left_len));
self_destruct_ptr right_result(
substring(right, 0, endp1 - left_len));
result = concat(left_result, right_result);
# ifndef __GC
__stl_assert(1 == result -> refcount);
# endif
return result;
}
case RopeBase::leaf:
{
RopeLeaf * l = (RopeLeaf *)base;
RopeLeaf * result;
size_t result_len;
if (start >= adj_endp1) return 0;
result_len = adj_endp1 - start;
if (result_len > lazy_threshold) goto lazy;
# ifdef __GC
const charT *section = l -> data + start;
result = RopeLeaf_from_char_ptr(section, result_len);
result -> c_string = 0; // Not eos terminated.
# else
// We should sometimes create substring node instead.
result = RopeLeaf_from_unowned_char_ptr(
l -> data + start, result_len);
# endif
return result;
}
case RopeBase::substringfn:
// Avoid introducing mutiple layers of substring nodes.
{
RopeSubstring *old = (RopeSubstring *)base;
size_t result_len;
if (start >= adj_endp1) return 0;
result_len = adj_endp1 - start;
if (result_len > lazy_threshold) {
RopeSubstring * space = SAlloc::allocate();
RopeSubstring * result =
new(space) RopeSubstring(old -> base,
start + old -> start,
adj_endp1 - start);
return result;
} // else fall through:
}
case RopeBase::function:
{
RopeFunction * f = (RopeFunction *)base;
charT *section;
size_t result_len;
if (start >= adj_endp1) return 0;
result_len = adj_endp1 - start;
if (result_len > lazy_threshold) goto lazy;
section = (charT *)
DataAlloc::allocate(rounded_up_size(result_len));
__STL_TRY
(*(f -> fn))(start, result_len, section);
__STL_UNWIND(RopeBase::free_string(section, result_len));
__cond_store_eos(section[result_len]);
return RopeLeaf_from_char_ptr(section, result_len);
}
}
/*NOTREACHED*/
__stl_assert(false);
lazy:
{
// Create substring node.
RopeSubstring * space = SAlloc::allocate();
RopeSubstring * result = new(space) RopeSubstring(base, start,
adj_endp1 - start);
return result;
}
}
template<class charT>
class __rope_flatten_char_consumer : public __rope_char_consumer<charT> {
private:
charT * buf_ptr;
public:
charT * buffer;
__rope_flatten_char_consumer(charT * buffer) {
buf_ptr = buffer;
};
~__rope_flatten_char_consumer() {}
bool operator() (const charT* leaf, size_t n) {
uninitialized_copy_n(leaf, n, buf_ptr);
buf_ptr += n;
return true;
}
};
template<class charT>
class __rope_find_char_char_consumer : public __rope_char_consumer<charT> {
private:
charT pattern;
public:
size_t count; // Number of nonmatching characters
__rope_find_char_char_consumer(charT p) : pattern(p), count(0) {}
~__rope_find_char_char_consumer() {}
bool operator() (const charT* leaf, size_t n) {
size_t i;
for (i = 0; i < n; i++) {
if (leaf[i] == pattern) {
count += i; return false;
}
}
count += n; return true;
}
};
template<class charT>
class __rope_insert_char_consumer : public __rope_char_consumer<charT> {
private:
typedef ostream insert_ostream;
insert_ostream & o;
public:
charT * buffer;
__rope_insert_char_consumer(insert_ostream & writer) : o(writer) {};
~__rope_insert_char_consumer() { };
// Caller is presumed to own the ostream
bool operator() (const charT* leaf, size_t n);
// Returns true to continue traversal.
};
template<class charT>
bool __rope_insert_char_consumer<charT>::operator()
(const charT * leaf, size_t n)
{
size_t i;
// We assume that formatting is set up correctly for each element.
for (i = 0; i < n; i++) o << leaf[i];
return true;
}
inline bool __rope_insert_char_consumer<char>::operator()
(const char * leaf, size_t n)
{
size_t i;
for (i = 0; i < n; i++) o.put(leaf[i]);
return true;
}
#if !defined(_MSC_VER) && !defined(__BORLANDC__)
// I couldn't get this to work work with the VC++ version of basic_ostream.
inline bool __rope_insert_char_consumer<wchar_t>::operator()
(const wchar_t * leaf, size_t n)
{
size_t i;
for (i = 0; i < n; i++) o.put(leaf[i]);
return true;
}
#endif /* !_MSC_VER && !BORLAND */
template <class charT, class Alloc>
bool rope<charT, Alloc>::apply_to_pieces(
__rope_char_consumer<charT>& c,
const RopeBase * r,
size_t begin, size_t end)
{
if (0 == r) return true;
switch(r -> tag) {
case RopeBase::concat:
{
RopeConcatenation *conc = (RopeConcatenation *)r;
RopeBase *left = conc -> left;
size_t left_len = left -> size;
if (begin < left_len) {
size_t left_end = min(left_len, end);
if (!apply_to_pieces(c, left, begin, left_end)) {
return false;
}
}
if (end > left_len) {
RopeBase *right = conc -> right;
size_t right_start = max(left_len, begin);
if (!apply_to_pieces(c, right,
right_start - left_len,
end - left_len)) {
return false;
}
}
}
return true;
case RopeBase::leaf:
{
RopeLeaf * l = (RopeLeaf *)r;
return c(l -> data + begin, end - begin);
}
case RopeBase::function:
case RopeBase::substringfn:
{
RopeFunction * f = (RopeFunction *)r;
size_t len = end - begin;
bool result;
charT * buffer = DataAlloc::allocate(len);
__STL_TRY
(*(f -> fn))(begin, end, buffer);
result = c(buffer, len);
__STL_ALWAYS(DataAlloc::deallocate(buffer, len))
return result;
}
default:
__stl_assert(false);
/*NOTREACHED*/
return false;
}
}
inline void __rope_fill(ostream& o, size_t n)
{
char f = o.fill();
size_t i;
for (i = 0; i < n; i++) o.put(f);
}
template <class charT> inline bool __rope_is_simple(charT *) { return false; }
inline bool __rope_is_simple(char *) { return true; }
inline bool __rope_is_simple(wchar_t *) { return true; }
template<class charT, class Alloc>
ostream& operator<< (ostream& o, const rope<charT, Alloc>& r)
{
size_t w = o.width();
bool left = bool(o.flags() & ios::left);
size_t pad_len;
size_t rope_len = r.size();
__rope_insert_char_consumer<charT> c(o);
bool is_simple = __rope_is_simple((charT *)0);
if (rope_len < w) {
pad_len = w - rope_len;
} else {
pad_len = 0;
}
if (!is_simple) o.width(w/rope_len);
__STL_TRY
if (is_simple && !left && pad_len > 0) {
__rope_fill(o, pad_len);
}
r.apply_to_pieces(0, r.size(), c);
if (is_simple && left && pad_len > 0) {
__rope_fill(o, pad_len);
}
__STL_ALWAYS(if (!is_simple) o.width(w))
return o;
}
template <class charT, class Alloc>
charT *
rope<charT,Alloc>::flatten(RopeBase * r,
size_t start, size_t len,
charT * buffer)
{
__rope_flatten_char_consumer<charT> c(buffer);
apply_to_pieces(c, r, start, start + len);
return(buffer + len);
}
template <class charT, class Alloc>
size_t
rope<charT,Alloc>::find(charT pattern, size_t start) const
{
__rope_find_char_char_consumer<charT> c(pattern);
apply_to_pieces(c, tree_ptr, start, size());
return start + c.count;
}
template <class charT, class Alloc>
charT *
rope<charT,Alloc>::flatten(RopeBase * r, charT * buffer)
{
if (0 == r) return buffer;
switch(r -> tag) {
case RopeBase::concat:
{
RopeConcatenation *c = (RopeConcatenation *)r;
RopeBase *left = c -> left;
RopeBase *right = c -> right;
charT * rest = flatten(left, buffer);
return flatten(right, rest);
}
case RopeBase::leaf:
{
RopeLeaf * l = (RopeLeaf *)r;
return copy_n(l -> data, l -> size, buffer);
}
case RopeBase::function:
case RopeBase::substringfn:
// We dont yet do anything with substring nodes.
// This needs to be fixed before ropefiles will work well.
{
RopeFunction * f = (RopeFunction *)r;
(*(f -> fn))(0, f -> size, buffer);
return buffer + f -> size;
}
default:
__stl_assert(false);
/*NOTREACHED*/
return 0;
}
}
// This needs work for charT != char
template <class charT, class Alloc>
void
rope<charT,Alloc>::dump(RopeBase * r, int indent)
{
for (int i = 0; i < indent; i++) putchar(' ');
if (0 == r) {
printf("NULL\n"); return;
}
if (RopeBase::concat == r -> tag) {
RopeConcatenation *c = (RopeConcatenation *)r;
RopeBase *left = c -> left;
RopeBase *right = c -> right;
# ifdef __GC
printf("Concatenation %p (depth = %d, len = %ld, %s balanced)\n",
r, r -> depth, r -> size, r -> is_balanced? "" : "not");
# else
printf("Concatenation %p (rc = %ld, depth = %d, len = %ld, %s balanced)\n",
r, r -> refcount, r -> depth, r -> size,
r -> is_balanced? "" : "not");
# endif
dump(left, indent + 2);
dump(right, indent + 2);
return;
} else {
char * kind;
switch (r -> tag) {
case RopeBase::leaf:
kind = "Leaf";
break;
case RopeBase::function:
kind = "Function";
break;
case RopeBase::substringfn:
kind = "Function representing substring";
break;
default:
kind = "(corrupted kind field!)";
}
# ifdef __GC
printf("%s %p (depth = %d, len = %ld) ",
kind, r, r -> depth, r -> size);
# else
printf("%s %p (rc = %ld, depth = %d, len = %ld) ",
kind, r, r -> refcount, r -> depth, r -> size);
# endif
if (__is_one_byte_char_type((charT *)0)) {
const int max_len = 40;
self_destruct_ptr prefix(substring(r, 0, max_len));
charT buffer[max_len + 1];
bool too_big = r -> size > prefix-> size;
flatten(prefix, buffer);
buffer[prefix -> size] = __eos((charT *)0);
printf("%s%s\n", (char *)buffer, too_big? "...\n" : "\n");
} else {
printf("\n");
}
}
}
template <class charT, class Alloc>
const unsigned long
rope<charT,Alloc>::min_len[__rope_RopeBase<charT,Alloc>::max_rope_depth + 1] = {
/* 0 */1, /* 1 */2, /* 2 */3, /* 3 */5, /* 4 */8, /* 5 */13, /* 6 */21,
/* 7 */34, /* 8 */55, /* 9 */89, /* 10 */144, /* 11 */233, /* 12 */377,
/* 13 */610, /* 14 */987, /* 15 */1597, /* 16 */2584, /* 17 */4181,
/* 18 */6765, /* 19 */10946, /* 20 */17711, /* 21 */28657, /* 22 */46368,
/* 23 */75025, /* 24 */121393, /* 25 */196418, /* 26 */317811,
/* 27 */514229, /* 28 */832040, /* 29 */1346269, /* 30 */2178309,
/* 31 */3524578, /* 32 */5702887, /* 33 */9227465, /* 34 */14930352,
/* 35 */24157817, /* 36 */39088169, /* 37 */63245986, /* 38 */102334155,
/* 39 */165580141, /* 40 */267914296, /* 41 */433494437,
/* 42 */701408733, /* 43 */1134903170, /* 44 */1836311903,
/* 45 */2971215073 };
// These are Fibonacci numbers < 2**32.
template <class charT, class Alloc>
rope<charT,Alloc>::RopeBase *
rope<charT,Alloc>::balance(RopeBase *r)
{
RopeBase * forest[RopeBase::max_rope_depth + 1];
RopeBase * result = 0;
int i;
// Inariant:
// The concatenation of forest in descending order is equal to r.
// forest[i].size >= min_len[i]
// forest[i].depth = i
// References from forest are included in refcount.
for (i = 0; i <= RopeBase::max_rope_depth; ++i) forest[i] = 0;
__STL_TRY
add_to_forest(r, forest);
for (i = 0; i <= RopeBase::max_rope_depth; ++i) if (0 != forest[i]) {
# ifndef __GC
self_destruct_ptr old(result);
# endif
result = concat(forest[i], result);
forest[i] -> unref_nonnil();
# if !defined(__GC) && defined(__STL_USE_EXCEPTIONS)
forest[i] = 0;
# endif
}
__STL_UNWIND(for(i = 0; i <= RopeBase::max_rope_depth; i++)
unref(forest[i]))
if (result -> depth > RopeBase::max_rope_depth) abort();
return(result);
}
template <class charT, class Alloc>
void
rope<charT,Alloc>::add_to_forest(RopeBase *r, RopeBase **forest)
{
if (r -> is_balanced) {
add_leaf_to_forest(r, forest);
return;
}
__stl_assert(r -> tag == RopeBase::concat);
{
RopeConcatenation *c = (RopeConcatenation *)r;
add_to_forest(c -> left, forest);
add_to_forest(c -> right, forest);
}
}
template <class charT, class Alloc>
void
rope<charT,Alloc>::add_leaf_to_forest(RopeBase *r, RopeBase **forest)
{
RopeBase * insertee; // included in refcount
RopeBase * too_tiny = 0; // included in refcount
int i; // forest[0..i-1] is empty
size_t s = r -> size;
for (i = 0; s >= min_len[i+1]/* not this bucket */; ++i) {
if (0 != forest[i]) {
# ifndef __GC
self_destruct_ptr old(too_tiny);
# endif
too_tiny = concat_and_set_balanced(forest[i], too_tiny);
forest[i] -> unref_nonnil();
forest[i] = 0;
}
}
{
# ifndef __GC
self_destruct_ptr old(too_tiny);
# endif
insertee = concat_and_set_balanced(too_tiny, r);
}
// Too_tiny dead, and no longer included in refcount.
// Insertee is live and included.
__stl_assert(is_almost_balanced(insertee));
__stl_assert(insertee -> depth <= r -> depth + 1);
for (;; ++i) {
if (0 != forest[i]) {
# ifndef __GC
self_destruct_ptr old(insertee);
# endif
insertee = concat_and_set_balanced(forest[i], insertee);
forest[i] -> unref_nonnil();
forest[i] = 0;
__stl_assert(is_almost_balanced(insertee));
}
__stl_assert(min_len[i] <= insertee -> size);
__stl_assert(forest[i] == 0);
if (i == RopeBase::max_rope_depth
|| insertee -> size < min_len[i+1]) {
forest[i] = insertee;
// refcount is OK since insertee is now dead.
return;
}
}
}
template <class charT, class Alloc>
charT
rope<charT,Alloc>::fetch(RopeBase *r, size_type i)
{
__GC_CONST charT * cstr = r -> c_string;
__stl_assert(i < r -> size);
if (0 != cstr) return cstr[i];
for(;;) {
switch(r -> tag) {
case RopeBase::concat:
{
RopeConcatenation *c = (RopeConcatenation *)r;
RopeBase *left = c -> left;
size_t left_len = left -> size;
if (i >= left_len) {
i -= left_len;
r = c -> right;
} else {
r = left;
}
}
break;
case RopeBase::leaf:
{
RopeLeaf * l = (RopeLeaf *)r;
return l -> data[i];
}
case RopeBase::function:
case RopeBase::substringfn:
{
RopeFunction * f = (RopeFunction *)r;
charT result;
(*(f -> fn))(i, 1, &result);
return result;
}
}
}
}
# ifndef __GC
// Return a uniquely referenced character slot for the given
// position, or 0 if that's not possible.
template <class charT, class Alloc>
charT*
rope<charT,Alloc>::fetch_ptr(RopeBase *r, size_type i)
{
RopeBase * clrstack[RopeBase::max_rope_depth];
size_t csptr = 0;
for(;;) {
if (r -> refcount > 1) return 0;
switch(r -> tag) {
case RopeBase::concat:
{
RopeConcatenation *c = (RopeConcatenation *)r;
RopeBase *left = c -> left;
size_t left_len = left -> size;
if (c -> c_string != 0) clrstack[csptr++] = c;
if (i >= left_len) {
i -= left_len;
r = c -> right;
} else {
r = left;
}
}
break;
case RopeBase::leaf:
{
RopeLeaf * l = (RopeLeaf *)r;
if (l -> c_string != l -> data && l -> c_string != 0)
clrstack[csptr++] = l;
while (csptr > 0) {
-- csptr;
RopeBase * d = clrstack[csptr];
d -> free_c_string();
d -> c_string = 0;
}
return l -> data + i;
}
case RopeBase::function:
case RopeBase::substringfn:
return 0;
}
}
}
# endif /* __GC */
// The following could be implemented trivially using
// lexicographical_compare_3way.
// We do a little more work to avoid dealing with rope iterators for
// flat strings.
template <class charT, class Alloc>
int
rope<charT,Alloc>::compare (const RopeBase *left, const RopeBase *right)
{
size_t left_len;
size_t right_len;
if (0 == right) return 0 != left;
if (0 == left) return -1;
left_len = left -> size;
right_len = right -> size;
if (RopeBase::leaf == left -> tag) {
RopeLeaf *l = (RopeLeaf *) left;
if (RopeBase::leaf == right -> tag) {
RopeLeaf *r = (RopeLeaf *) right;
return lexicographical_compare_3way(
l -> data, l -> data + left_len,
r -> data, r -> data + right_len);
} else {
const_iterator rstart(right, 0);
const_iterator rend(right, right_len);
return lexicographical_compare_3way(
l -> data, l -> data + left_len,
rstart, rend);
}
} else {
const_iterator lstart(left, 0);
const_iterator lend(left, left_len);
if (RopeBase::leaf == right -> tag) {
RopeLeaf *r = (RopeLeaf *) right;
return lexicographical_compare_3way(
lstart, lend,
r -> data, r -> data + right_len);
} else {
const_iterator rstart(right, 0);
const_iterator rend(right, right_len);
return lexicographical_compare_3way(
lstart, lend,
rstart, rend);
}
}
}
// Assignment to reference proxies.
template <class charT, class Alloc>
__rope_charT_ref_proxy<charT, Alloc>&
__rope_charT_ref_proxy<charT, Alloc>::operator= (charT c) {
RopeBase * old = root -> tree_ptr;
# ifndef __GC
// First check for the case in which everything is uniquely
// referenced. In that case we can do this destructively.
charT * charT_ptr = my_rope::fetch_ptr(old, pos);
if (0 != charT_ptr) {
*charT_ptr = c;
return *this;
}
# endif
self_destruct_ptr left(my_rope::substring(old, 0, pos));
self_destruct_ptr right(my_rope::substring(old, pos+1, old -> size));
self_destruct_ptr result_left(my_rope::destr_concat_char_iter(left, &c, 1));
# ifndef __GC
__stl_assert(left == result_left || 1 == result_left -> refcount);
# endif
RopeBase * result =
my_rope::concat(result_left, right);
# ifndef __GC
__stl_assert(1 <= result -> refcount);
RopeBase::unref(old);
# endif
root -> tree_ptr = result;
return *this;
}
template <class charT, class Alloc>
inline __rope_charT_ref_proxy<charT, Alloc>::operator charT () const
{
if (current_valid) {
return current;
} else {
return my_rope::fetch(root->tree_ptr, pos);
}
}
template <class charT, class Alloc>
__rope_charT_ptr_proxy<charT, Alloc>
__rope_charT_ref_proxy<charT, Alloc>::operator& () const {
return __rope_charT_ptr_proxy<charT, Alloc>(*this);
}
template <class charT, class Alloc>
rope<charT, Alloc>::rope(size_t n, charT c)
{
rope result;
const size_t exponentiate_threshold = 32;
size_t exponent;
size_t rest;
charT *rest_buffer;
RopeBase * remainder;
rope remainder_rope;
if (0 == n) { tree_ptr = 0; return; }
exponent = n / exponentiate_threshold;
rest = n % exponentiate_threshold;
if (0 == rest) {
remainder = 0;
} else {
rest_buffer = DataAlloc::allocate(rounded_up_size(rest));
uninitialized_fill_n(rest_buffer, rest, c);
__cond_store_eos(rest_buffer[rest]);
__STL_TRY
remainder = RopeLeaf_from_char_ptr(rest_buffer, rest);
__STL_UNWIND(RopeBase::free_string(rest_buffer, rest))
}
remainder_rope.tree_ptr = remainder;
if (exponent != 0) {
charT * base_buffer =
DataAlloc::allocate(rounded_up_size(exponentiate_threshold));
RopeLeaf * base_leaf;
rope base_rope;
uninitialized_fill_n(base_buffer, exponentiate_threshold, c);
__cond_store_eos(base_buffer[exponentiate_threshold]);
__STL_TRY
base_leaf = RopeLeaf_from_char_ptr(base_buffer,
exponentiate_threshold);
__STL_UNWIND(RopeBase::free_string(base_buffer, exponentiate_threshold))
base_rope.tree_ptr = base_leaf;
if (1 == exponent) {
result = base_rope;
# ifndef __GC
__stl_assert(1 == result -> tree_ptr -> refcount);
# endif
} else {
result = power(base_rope, exponent, concat_fn());
}
if (0 != remainder) {
result += remainder_rope;
}
} else {
result = remainder_rope;
}
tree_ptr = result.tree_ptr;
tree_ptr -> ref_nonnil();
}
template<class charT, class Alloc> charT rope<charT,Alloc>::empty_c_str[1];
# ifdef _PTHREADS
template<class charT, class Alloc>
pthread_mutex_t rope<charT,Alloc>::swap_lock = PTHREAD_MUTEX_INITIALIZER;
# endif
template<class charT, class Alloc>
const charT * rope<charT,Alloc>::c_str() const {
if (0 == tree_ptr) {
empty_c_str[0] = __eos((charT *)0); // Possibly redundant,
// but probably fast.
return empty_c_str;
}
__GC_CONST charT * old_c_string = tree_ptr -> c_string;
if (0 != old_c_string) return(old_c_string);
size_t s = size();
charT * result = DataAlloc::allocate(s + 1);
flatten(tree_ptr, result);
result[s] = __eos((charT *)0);
# ifdef __GC
tree_ptr -> c_string = result;
# else
if ((old_c_string = atomic_swap(&(tree_ptr -> c_string), result)) != 0) {
// It must have been added in the interim. Hence it had to have been
// separately allocated. Deallocate the old copy, since we just
// replaced it.
destroy(old_c_string, old_c_string + s + 1);
DataAlloc::deallocate(old_c_string, s + 1);
}
# endif
return(result);
}
template<class charT, class Alloc>
const charT * rope<charT,Alloc>::replace_with_c_str() {
if (0 == tree_ptr) {
empty_c_str[0] = __eos((charT *)0);
return empty_c_str;
}
__GC_CONST charT * old_c_string = tree_ptr -> c_string;
if (RopeBase::leaf == tree_ptr -> tag && 0 != old_c_string) {
return(old_c_string);
}
size_t s = size();
charT * result = DataAlloc::allocate(rounded_up_size(s));
flatten(tree_ptr, result);
result[s] = __eos((charT *)0);
tree_ptr -> unref_nonnil();
tree_ptr = RopeLeaf_from_char_ptr(result, s);
return(result);
}
// Algorithm specializations. More should be added.
#ifndef _MSC_VER
// I couldn't get this to work with VC++
template<class charT,class Alloc>
void
__rope_rotate(__rope_iterator<charT,Alloc> first,
__rope_iterator<charT,Alloc> middle,
__rope_iterator<charT,Alloc> last) {
__stl_assert(first.container() == middle.container()
&& middle.container() == last.container());
rope<charT,Alloc>& r(first.container());
rope<charT,Alloc> prefix = r.substr(0, first.index());
rope<charT,Alloc> suffix = r.substr(last.index(), r.size() - last.index());
rope<charT,Alloc> part1 = r.substr(middle.index(),
last.index() - middle.index());
rope<charT,Alloc> part2 = r.substr(first.index(),
middle.index() - first.index());
r = prefix;
r += part1;
r += part2;
r += suffix;
}
inline void rotate(__rope_iterator<char,__ALLOC> first,
__rope_iterator<char,__ALLOC> middle,
__rope_iterator<char,__ALLOC> last) {
__rope_rotate(first, middle, last);
}
# if 0
// Probably not useful for several reasons:
// - for SGIs 7.1 compiler and probably some others,
// this forces lots of rope<wchar_t, ...> instantiations, creating a
// code bloat and compile time problem. (Fixed in 7.2.)
// - wchar_t is 4 bytes wide on most UNIX platforms, making it unattractive
// for unicode strings. Unsigned short may be a better character
// type.
inline void rotate(__rope_iterator<wchar_t,__ALLOC> first,
__rope_iterator<wchar_t,__ALLOC> middle,
__rope_iterator<wchar_t,__ALLOC> last) {
__rope_rotate(first, middle, last);
}
# endif
#endif /* _MSC_VER */
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