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neovim/src/nvim/marktree.c

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
// Tree data structure for storing marks at (row, col) positions and updating
// them to arbitrary text changes. Derivative work of kbtree in klib, whose
// copyright notice is reproduced below. Also inspired by the design of the
// marker tree data structure of the Atom editor, regarding efficient updates
// to text changes.
//
// Marks are inserted using marktree_put. Text changes are processed using
// marktree_splice. All read and delete operations use the iterator.
// use marktree_itr_get to put an iterator at a given position or
// marktree_lookup to lookup a mark by its id (iterator optional in this case).
// Use marktree_itr_current and marktree_itr_next/prev to read marks in a loop.
// marktree_del_itr deletes the current mark of the iterator and implicitly
// moves the iterator to the next mark.
// Copyright notice for kbtree (included in heavily modified form):
//
// Copyright 1997-1999, 2001, John-Mark Gurney.
// 2008-2009, Attractive Chaos <attractor@live.co.uk>
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// Changes done by by the neovim project follow the Apache v2 license available
// at the repo root.
#include <assert.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "klib/kvec.h"
#include "nvim/garray.h"
#include "nvim/marktree.h"
#include "nvim/memory.h"
#include "nvim/pos.h"
// only for debug functions
#include "nvim/api/private/defs.h"
#include "nvim/api/private/helpers.h"
#include "nvim/macros.h"
#define T MT_BRANCH_FACTOR
#define ILEN (sizeof(MTNode) + (2 * T) * sizeof(void *))
#define ID_INCR (((uint64_t)1) << 2)
#define rawkey(itr) ((itr)->x->key[(itr)->i])
static bool pos_leq(MTPos a, MTPos b)
{
return a.row < b.row || (a.row == b.row && a.col <= b.col);
}
static bool pos_less(MTPos a, MTPos b)
{
return !pos_leq(b, a);
}
static void relative(MTPos base, MTPos *val)
{
assert(pos_leq(base, *val));
if (val->row == base.row) {
val->row = 0;
val->col -= base.col;
} else {
val->row -= base.row;
}
}
static void unrelative(MTPos base, MTPos *val)
{
if (val->row == 0) {
val->row = base.row;
val->col += base.col;
} else {
val->row += base.row;
}
}
static void compose(MTPos *base, MTPos val)
{
if (val.row == 0) {
base->col += val.col;
} else {
base->row += val.row;
base->col = val.col;
}
}
// Used by `marktree_splice`. Need to keep track of marks which moved
// in order to repair intersections.
typedef struct {
uint64_t id;
MTNode *old, *new;
int old_i, new_i;
} Damage;
typedef kvec_withinit_t(Damage, 8) DamageList;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "marktree.c.generated.h"
#endif
#define mt_generic_cmp(a, b) (((b) < (a)) - ((a) < (b)))
static int key_cmp(MTKey a, MTKey b)
{
int cmp = mt_generic_cmp(a.pos.row, b.pos.row);
if (cmp != 0) {
return cmp;
}
cmp = mt_generic_cmp(a.pos.col, b.pos.col);
if (cmp != 0) {
return cmp;
}
// TODO(bfredl): MT_FLAG_REAL could go away if we fix marktree_getp_aux for real
const uint16_t cmp_mask = MT_FLAG_RIGHT_GRAVITY | MT_FLAG_END | MT_FLAG_REAL | MT_FLAG_LAST;
return mt_generic_cmp(a.flags & cmp_mask, b.flags & cmp_mask);
}
/// @return position of k if it exists in the node, otherwise the position
/// it should be inserted, which ranges from 0 to x->n _inclusively_
/// @param match (optional) set to TRUE if match (pos, gravity) was found
static inline int marktree_getp_aux(const MTNode *x, MTKey k, bool *match)
{
bool dummy_match;
bool *m = match ? match : &dummy_match;
int begin = 0, end = x->n;
if (x->n == 0) {
*m = false;
return -1;
}
while (begin < end) {
int mid = (begin + end) >> 1;
if (key_cmp(x->key[mid], k) < 0) {
begin = mid + 1;
} else {
end = mid;
}
}
if (begin == x->n) {
*m = false;
return x->n - 1;
}
if (!(*m = (key_cmp(k, x->key[begin]) == 0))) {
begin--;
}
return begin;
}
static inline void refkey(MarkTree *b, MTNode *x, int i)
{
pmap_put(uint64_t)(b->id2node, mt_lookup_key(x->key[i]), x);
}
static MTNode *id2node(MarkTree *b, uint64_t id)
{
return pmap_get(uint64_t)(b->id2node, id);
}
// put functions
// x must be an internal node, which is not full
// x->ptr[i] should be a full node, i e x->ptr[i]->n == 2*T-1
static inline void split_node(MarkTree *b, MTNode *x, const int i, MTKey next)
{
MTNode *y = x->ptr[i];
MTNode *z = marktree_alloc_node(b, y->level);
z->level = y->level;
z->n = T - 1;
// tricky: we might split a node in between inserting the start node and the end
// node of the same pair. Then we must not intersect this id yet (done later
// in marktree_intersect_pair).
uint64_t last_start = mt_end(next) ? mt_lookup_id(next.ns, next.id, false) : MARKTREE_END_FLAG;
// no alloc in the common case (less than 4 intersects)
kvi_copy(z->intersect, y->intersect);
if (!y->level) {
uint64_t pi = pseudo_index(y, 0); // note: sloppy pseudo-index
for (int j = 0; j < T; j++) {
MTKey k = y->key[j];
uint64_t pi_end = pseudo_index_for_id(b, mt_lookup_id(k.ns, k.id, true), true);
if (mt_start(k) && pi_end > pi && mt_lookup_key(k) != last_start) {
intersect_node(b, z, mt_lookup_id(k.ns, k.id, false));
}
}
// note: y->key[T-1] is moved up and thus checked for both
for (int j = T - 1; j < (T * 2) - 1; j++) {
MTKey k = y->key[j];
uint64_t pi_start = pseudo_index_for_id(b, mt_lookup_id(k.ns, k.id, false), true);
if (mt_end(k) && pi_start > 0 && pi_start < pi) {
intersect_node(b, y, mt_lookup_id(k.ns, k.id, false));
}
}
}
memcpy(z->key, &y->key[T], sizeof(MTKey) * (T - 1));
for (int j = 0; j < T - 1; j++) {
refkey(b, z, j);
}
if (y->level) {
memcpy(z->ptr, &y->ptr[T], sizeof(MTNode *) * T);
for (int j = 0; j < T; j++) {
z->ptr[j]->parent = z;
z->ptr[j]->p_idx = (int16_t)j;
}
}
y->n = T - 1;
memmove(&x->ptr[i + 2], &x->ptr[i + 1],
sizeof(MTNode *) * (size_t)(x->n - i));
x->ptr[i + 1] = z;
z->parent = x; // == y->parent
for (int j = i + 1; j < x->n + 2; j++) {
x->ptr[j]->p_idx = (int16_t)j;
}
memmove(&x->key[i + 1], &x->key[i], sizeof(MTKey) * (size_t)(x->n - i));
// move key to internal layer:
x->key[i] = y->key[T - 1];
refkey(b, x, i);
x->n++;
for (int j = 0; j < T - 1; j++) {
relative(x->key[i].pos, &z->key[j].pos);
}
if (i > 0) {
unrelative(x->key[i - 1].pos, &x->key[i].pos);
}
if (y->level) {
bubble_up(y);
bubble_up(z);
} else {
// code above goose here
}
}
// x must not be a full node (even if there might be internal space)
static inline void marktree_putp_aux(MarkTree *b, MTNode *x, MTKey k)
{
// TODO(bfredl): ugh, make sure this is the _last_ valid (pos, gravity) position,
// to minimize movement
int i = marktree_getp_aux(x, k, NULL) + 1;
if (x->level == 0) {
if (i != x->n) {
memmove(&x->key[i + 1], &x->key[i],
(size_t)(x->n - i) * sizeof(MTKey));
}
x->key[i] = k;
refkey(b, x, i);
x->n++;
} else {
if (x->ptr[i]->n == 2 * T - 1) {
split_node(b, x, i, k);
if (key_cmp(k, x->key[i]) > 0) {
i++;
}
}
if (i > 0) {
relative(x->key[i - 1].pos, &k.pos);
}
marktree_putp_aux(b, x->ptr[i], k);
}
}
void marktree_put(MarkTree *b, MTKey key, int end_row, int end_col, bool end_right)
{
assert(!(key.flags & ~MT_FLAG_EXTERNAL_MASK));
if (end_row >= 0) {
key.flags |= MT_FLAG_PAIRED;
}
marktree_put_key(b, key);
if (end_row >= 0) {
MTKey end_key = key;
end_key.flags = (uint16_t)((uint16_t)(key.flags & ~MT_FLAG_RIGHT_GRAVITY)
|(uint16_t)MT_FLAG_END
|(uint16_t)(end_right ? MT_FLAG_RIGHT_GRAVITY : 0));
end_key.pos = (MTPos){ end_row, end_col };
marktree_put_key(b, end_key);
MarkTreeIter itr[1] = { 0 }, end_itr[1] = { 0 };
marktree_lookup(b, mt_lookup_key(key), itr);
marktree_lookup(b, mt_lookup_key(end_key), end_itr);
marktree_intersect_pair(b, mt_lookup_key(key), itr, end_itr, false);
}
}
// this is currently not used very often, but if it was it should use binary search
static bool intersection_has(Intersection *x, uint64_t id)
{
for (size_t i = 0; i < kv_size(*x); i++) {
if (kv_A(*x, i) == id) {
return true;
} else if (kv_A(*x, i) >= id) {
return false;
}
}
return false;
}
static void intersect_node(MarkTree *b, MTNode *x, uint64_t id)
{
assert(!(id & MARKTREE_END_FLAG));
kvi_pushp(x->intersect);
// optimized for the common case: new key is always in the end
for (ssize_t i = (ssize_t)kv_size(x->intersect) - 1; i >= 0; i--) {
if (i > 0 && kv_A(x->intersect, i - 1) > id) {
kv_A(x->intersect, i) = kv_A(x->intersect, i - 1);
} else {
kv_A(x->intersect, i) = id;
break;
}
}
}
static void unintersect_node(MarkTree *b, MTNode *x, uint64_t id, bool strict)
{
assert(!(id & MARKTREE_END_FLAG));
bool seen = false;
size_t i;
for (i = 0; i < kv_size(x->intersect); i++) {
if (kv_A(x->intersect, i) < id) {
continue;
} else if (kv_A(x->intersect, i) == id) {
seen = true;
break;
} else { // (kv_A(x->intersect, i) > id)
break;
}
}
if (strict) {
assert(seen);
}
if (seen) {
if (i < kv_size(x->intersect) - 1) {
memmove(&kv_A(x->intersect, i), &kv_A(x->intersect, i + 1), (kv_size(x->intersect) - i - 1) *
sizeof(kv_A(x->intersect, i)));
}
kv_size(x->intersect)--;
}
}
/// @param itr mutated
/// @param end_itr not mutated
void marktree_intersect_pair(MarkTree *b, uint64_t id, MarkTreeIter *itr, MarkTreeIter *end_itr,
bool delete)
{
int lvl = 0, maxlvl = MIN(itr->lvl, end_itr->lvl);
#define iat(itr, l, q) ((l == itr->lvl) ? itr->i + q : itr->s[l].i)
for (; lvl < maxlvl; lvl++) {
if (itr->s[lvl].i > end_itr->s[lvl].i) {
return; // empty range
} else if (itr->s[lvl].i < end_itr->s[lvl].i) {
break; // work to do
}
}
if (lvl == maxlvl && iat(itr, lvl, 1) > iat(end_itr, lvl, 0)) {
return; // empty range
}
while (itr->x) {
bool skip = false;
if (itr->x == end_itr->x) {
if (itr->x->level == 0 || itr->i >= end_itr->i) {
break;
} else {
skip = true;
}
} else if (itr->lvl > lvl) {
skip = true;
} else {
if (iat(itr, lvl, 1) < iat(end_itr, lvl, 1)) {
skip = true;
} else {
lvl++;
}
}
if (skip) {
if (itr->x->level) {
MTNode *x = itr->x->ptr[itr->i + 1];
if (delete) {
unintersect_node(b, x, id, true);
} else {
intersect_node(b, x, id);
}
}
}
marktree_itr_next_skip(b, itr, skip, true, NULL);
}
#undef iat
}
static MTNode *marktree_alloc_node(MarkTree *b, bool internal)
{
MTNode *x = xcalloc(1, internal ? ILEN : sizeof(MTNode));
kvi_init(x->intersect);
b->n_nodes++;
return x;
}
void marktree_put_key(MarkTree *b, MTKey k)
{
k.flags |= MT_FLAG_REAL; // let's be real.
if (!b->root) {
b->root = marktree_alloc_node(b, true);
}
MTNode *r, *s;
b->n_keys++;
r = b->root;
if (r->n == 2 * T - 1) {
s = marktree_alloc_node(b, true);
b->root = s; s->level = r->level + 1; s->n = 0;
s->ptr[0] = r;
r->parent = s;
r->p_idx = 0;
split_node(b, s, 0, k);
r = s;
}
marktree_putp_aux(b, r, k);
}
/// INITIATING DELETION PROTOCOL:
///
/// 1. Construct a valid iterator to the node to delete (argument)
/// 2. If an "internal" key. Iterate one step to the left or right,
/// which gives an internal key "auxiliary key".
/// 3. Now delete this internal key (intended or auxiliary).
/// The leaf node X might become undersized.
/// 4. If step two was done: now replace the key that _should_ be
/// deleted with the auxiliary key. Adjust relative
/// 5. Now "repair" the tree as needed. We always start at a leaf node X.
/// - if the node is big enough, terminate
/// - if we can steal from the left, steal
/// - if we can steal from the right, steal
/// - otherwise merge this node with a neighbour. This might make our
/// parent undersized. So repeat 5 for the parent.
/// 6. If 4 went all the way to the root node. The root node
/// might have ended up with size 0. Delete it then.
///
/// The iterator remains valid, and now points at the key _after_ the deleted
/// one.
///
/// @param rev should be true if we plan to iterate _backwards_ and delete
/// stuff before this key. Most of the time this is false (the
/// recommended strategy is to always iterate forward)
uint64_t marktree_del_itr(MarkTree *b, MarkTreeIter *itr, bool rev)
{
int adjustment = 0;
MTNode *cur = itr->x;
int curi = itr->i;
uint64_t id = mt_lookup_key(cur->key[curi]);
MTKey raw = rawkey(itr);
uint64_t other = 0;
if (mt_paired(raw) && !(raw.flags & MT_FLAG_ORPHANED)) {
other = mt_lookup_key_side(raw, !mt_end(raw));
MarkTreeIter other_itr[1];
marktree_lookup(b, other, other_itr);
rawkey(other_itr).flags |= MT_FLAG_ORPHANED;
// Remove intersect markers. NB: must match exactly!
if (mt_start(raw)) {
MarkTreeIter this_itr[1] = { *itr }; // mutated copy
marktree_intersect_pair(b, id, this_itr, other_itr, true);
} else {
marktree_intersect_pair(b, other, other_itr, itr, true);
}
}
if (itr->x->level) {
if (rev) {
abort();
} else {
// steal previous node
marktree_itr_prev(b, itr);
adjustment = -1;
}
}
// 3.
MTNode *x = itr->x;
assert(x->level == 0);
MTKey intkey = x->key[itr->i];
if (x->n > itr->i + 1) {
memmove(&x->key[itr->i], &x->key[itr->i + 1],
sizeof(MTKey) * (size_t)(x->n - itr->i - 1));
}
x->n--;
b->n_keys--;
pmap_del(uint64_t)(b->id2node, id, NULL);
// 4.
// if (adjustment == 1) {
// abort();
// }
if (adjustment == -1) {
int ilvl = itr->lvl - 1;
MTNode *lnode = x;
uint64_t start_id = 0;
bool did_bubble = false;
if (mt_end(intkey)) {
start_id = mt_lookup_key_side(intkey, false);
}
do {
MTNode *p = lnode->parent;
if (ilvl < 0) {
abort();
}
int i = itr->s[ilvl].i;
assert(p->ptr[i] == lnode);
if (i > 0) {
unrelative(p->key[i - 1].pos, &intkey.pos);
}
if (p != cur && start_id) {
if (intersection_has(&p->ptr[0]->intersect, start_id)) {
// if not the first time, we need to undo the addition in the
// previous step (`intersect_node` just below)
int last = (lnode != x) ? 1 : 0;
for (int k = 0; k < p->n + last; k++) { // one less as p->ptr[n] is the last
unintersect_node(b, p->ptr[k], start_id, true);
}
intersect_node(b, p, start_id);
did_bubble = true;
}
}
lnode = p;
ilvl--;
} while (lnode != cur);
MTKey deleted = cur->key[curi];
cur->key[curi] = intkey;
refkey(b, cur, curi);
// if `did_bubble` then we already added `start_id` to some parent
if (mt_end(cur->key[curi]) && !did_bubble) {
uint64_t pi = pseudo_index(x, 0); // note: sloppy pseudo-index
uint64_t pi_start = pseudo_index_for_id(b, start_id, true);
if (pi_start > 0 && pi_start < pi) {
intersect_node(b, x, start_id);
}
}
relative(intkey.pos, &deleted.pos);
MTNode *y = cur->ptr[curi + 1];
if (deleted.pos.row || deleted.pos.col) {
while (y) {
for (int k = 0; k < y->n; k++) {
unrelative(deleted.pos, &y->key[k].pos);
}
y = y->level ? y->ptr[0] : NULL;
}
}
itr->i--;
}
// 5.
bool itr_dirty = false;
int rlvl = itr->lvl - 1;
int *lasti = &itr->i;
MTPos ppos = itr->pos;
while (x != b->root) {
assert(rlvl >= 0);
MTNode *p = x->parent;
if (x->n >= T - 1) {
// we are done, if this node is fine the rest of the tree will be
break;
}
int pi = itr->s[rlvl].i;
assert(p->ptr[pi] == x);
if (pi > 0) {
ppos.row -= p->key[pi - 1].pos.row;
ppos.col = itr->s[rlvl].oldcol;
}
// ppos is now the pos of p
if (pi > 0 && p->ptr[pi - 1]->n > T - 1) {
*lasti += 1;
itr_dirty = true;
// steal one key from the left neighbour
pivot_right(b, ppos, p, pi - 1);
break;
} else if (pi < p->n && p->ptr[pi + 1]->n > T - 1) {
// steal one key from right neighbour
pivot_left(b, ppos, p, pi);
break;
} else if (pi > 0) {
assert(p->ptr[pi - 1]->n == T - 1);
// merge with left neighbour
*lasti += T;
x = merge_node(b, p, pi - 1);
if (lasti == &itr->i) {
// TRICKY: we merged the node the iterator was on
itr->x = x;
}
itr->s[rlvl].i--;
itr_dirty = true;
} else {
assert(pi < p->n && p->ptr[pi + 1]->n == T - 1);
merge_node(b, p, pi);
// no iter adjustment needed
}
lasti = &itr->s[rlvl].i;
rlvl--;
x = p;
}
// 6.
if (b->root->n == 0) {
if (itr->lvl > 0) {
memmove(itr->s, itr->s + 1, (size_t)(itr->lvl - 1) * sizeof(*itr->s));
itr->lvl--;
}
if (b->root->level) {
MTNode *oldroot = b->root;
b->root = b->root->ptr[0];
b->root->parent = NULL;
marktree_free_node(b, oldroot);
} else {
// no items, nothing for iterator to point to
// not strictly needed, should handle delete right-most mark anyway
itr->x = NULL;
}
}
if (itr->x && itr_dirty) {
marktree_itr_fix_pos(b, itr);
}
// BONUS STEP: fix the iterator, so that it points to the key afterwards
// TODO(bfredl): with "rev" should point before
// if (adjustment == 1) {
// abort();
// }
if (adjustment == -1) {
// tricky: we stand at the deleted space in the previous leaf node.
// But the inner key is now the previous key we stole, so we need
// to skip that one as well.
marktree_itr_next(b, itr);
marktree_itr_next(b, itr);
} else {
if (itr->x && itr->i >= itr->x->n) {
// we deleted the last key of a leaf node
// go to the inner key after that.
assert(itr->x->level == 0);
marktree_itr_next(b, itr);
}
}
return other;
}
/// similar to intersect_common but modify x and y in place to retain
/// only the items which are NOT in common
static void intersect_merge(Intersection *restrict m, Intersection *restrict x,
Intersection *restrict y)
{
size_t xi = 0, yi = 0;
size_t xn = 0, yn = 0;
while (xi < kv_size(*x) && yi < kv_size(*y)) {
if (kv_A(*x, xi) == kv_A(*y, yi)) {
// TODO(bfredl): kvi_pushp is actually quite complex, break out kvi_resize() to a function?
kvi_push(*m, kv_A(*x, xi));
xi++;
yi++;
} else if (kv_A(*x, xi) < kv_A(*y, yi)) {
kv_A(*x, xn++) = kv_A(*x, xi++);
} else {
kv_A(*y, yn++) = kv_A(*y, yi++);
}
}
if (xi < kv_size(*x)) {
memmove(&kv_A(*x, xn), &kv_A(*x, xi), sizeof(kv_A(*x, xn)) * (kv_size(*x) - xi));
xn += kv_size(*x) - xi;
}
if (yi < kv_size(*y)) {
memmove(&kv_A(*y, yn), &kv_A(*y, yi), sizeof(kv_A(*y, yn)) * (kv_size(*y) - yi));
yn += kv_size(*y) - yi;
}
kv_size(*x) = xn;
kv_size(*y) = yn;
}
// w used to be a child of x but it is now a child of y, adjust intersections accordingly
// @param[out] d are intersections which should be added to the old children of y
static void intersect_mov(Intersection *restrict x, Intersection *restrict y,
Intersection *restrict w, Intersection *restrict d)
{
size_t wi = 0, yi = 0;
size_t wn = 0, yn = 0;
size_t xi = 0;
while (wi < kv_size(*w) || xi < kv_size(*x)) {
if (wi < kv_size(*w) && (xi >= kv_size(*x) || kv_A(*x, xi) >= kv_A(*w, wi))) {
if (xi < kv_size(*x) && kv_A(*x, xi) == kv_A(*w, wi)) {
xi++;
}
// now w < x strictly
while (yi < kv_size(*y) && kv_A(*y, yi) < kv_A(*w, wi)) {
kvi_push(*d, kv_A(*y, yi));
yi++;
}
if (yi < kv_size(*y) && kv_A(*y, yi) == kv_A(*w, wi)) {
kv_A(*y, yn++) = kv_A(*y, yi++);
wi++;
} else {
kv_A(*w, wn++) = kv_A(*w, wi++);
}
} else {
// x < w strictly
while (yi < kv_size(*y) && kv_A(*y, yi) < kv_A(*x, xi)) {
kvi_push(*d, kv_A(*y, yi));
yi++;
}
if (yi < kv_size(*y) && kv_A(*y, yi) == kv_A(*x, xi)) {
kv_A(*y, yn++) = kv_A(*y, yi++);
xi++;
} else {
// add kv_A(x, xi) at kv_A(w, wn), pushing up wi if wi == wn
if (wi == wn) {
size_t n = kv_size(*w) - wn;
kvi_pushp(*w);
if (n > 0) {
memmove(&kv_A(*w, wn + 1), &kv_A(*w, wn), n * sizeof(kv_A(*w, 0)));
}
kv_A(*w, wi) = kv_A(*x, xi);
wn++;
wi++; // no need to consider the added element again
} else {
assert(wn < wi);
kv_A(*w, wn++) = kv_A(*x, xi);
}
xi++;
}
}
}
if (yi < kv_size(*y)) {
// move remaining items to d
size_t n = kv_size(*y) - yi; // at least one
kvi_ensure_more_space(*d, n);
memcpy(&kv_A(*d, kv_size(*d)), &kv_A(*y, yi), n * sizeof(kv_A(*d, 0)));
kv_size(*d) += n;
}
kv_size(*w) = wn;
kv_size(*y) = yn;
}
bool intersect_mov_test(uint64_t *x, size_t nx, uint64_t *y, size_t ny, uint64_t *win, size_t nwin,
uint64_t *wout, size_t *nwout, uint64_t *dout, size_t *ndout)
{
// x is immutable in the context of intersect_mov. y might shrink, but we
// don't care about it (we get it the deleted ones in d)
Intersection xi = { .items = x, .size = nx };
Intersection yi = { .items = y, .size = ny };
Intersection w;
kvi_init(w);
for (size_t i = 0; i < nwin; i++) {
kvi_push(w, win[i]);
}
Intersection d;
kvi_init(d);
intersect_mov(&xi, &yi, &w, &d);
if (w.size > *nwout || d.size > *ndout) {
return false;
}
memcpy(wout, w.items, sizeof(w.items[0]) * w.size);
*nwout = w.size;
memcpy(dout, d.items, sizeof(d.items[0]) * d.size);
*ndout = d.size;
return true;
}
/// intersection: i = x & y
static void intersect_common(Intersection *i, Intersection *x, Intersection *y)
{
size_t xi = 0, yi = 0;
while (xi < kv_size(*x) && yi < kv_size(*y)) {
if (kv_A(*x, xi) == kv_A(*y, yi)) {
kvi_push(*i, kv_A(*x, xi));
xi++;
yi++;
} else if (kv_A(*x, xi) < kv_A(*y, yi)) {
xi++;
} else {
yi++;
}
}
}
// inplace union: x |= y
static void intersect_add(Intersection *x, Intersection *y)
{
size_t xi = 0, yi = 0;
while (xi < kv_size(*x) && yi < kv_size(*y)) {
if (kv_A(*x, xi) == kv_A(*y, yi)) {
xi++;
yi++;
} else if (kv_A(*y, yi) < kv_A(*x, xi)) {
size_t n = kv_size(*x) - xi; // at least one
kvi_pushp(*x);
memmove(&kv_A(*x, xi + 1), &kv_A(*x, xi), n * sizeof(kv_A(*x, 0)));
kv_A(*x, xi) = kv_A(*y, yi);
xi++; // newly added element
yi++;
} else {
xi++;
}
}
if (yi < kv_size(*y)) {
size_t n = kv_size(*y) - yi; // at least one
kvi_ensure_more_space(*x, n);
memcpy(&kv_A(*x, kv_size(*x)), &kv_A(*y, yi), n * sizeof(kv_A(*x, 0)));
kv_size(*x) += n;
}
}
// inplace assymetric difference: x &= ~y
static void intersect_sub(Intersection *restrict x, Intersection *restrict y)
{
size_t xi = 0, yi = 0;
size_t xn = 0;
while (xi < kv_size(*x) && yi < kv_size(*y)) {
if (kv_A(*x, xi) == kv_A(*y, yi)) {
xi++;
yi++;
} else if (kv_A(*x, xi) < kv_A(*y, yi)) {
kv_A(*x, xn++) = kv_A(*x, xi++);
} else {
yi++;
}
}
if (xi < kv_size(*x)) {
size_t n = kv_size(*x) - xi;
if (xn < xi) { // otherwise xn == xi
memmove(&kv_A(*x, xn), &kv_A(*x, xi), n * sizeof(kv_A(*x, 0)));
}
xn += n;
}
kv_size(*x) = xn;
}
/// x is a node which shrunk, or the half of a split
///
/// this means that intervals which previously intersected all the (current)
/// child nodes, now instead intersects `x` itself.
static void bubble_up(MTNode *x)
{
Intersection xi;
kvi_init(xi);
// due to invariants, the largest subset of _all_ subnodes is the intersection
// between the first and the last
intersect_common(&xi, &x->ptr[0]->intersect, &x->ptr[x->n]->intersect);
if (kv_size(xi)) {
for (int i = 0; i < x->n + 1; i++) {
intersect_sub(&x->ptr[i]->intersect, &xi);
}
intersect_add(&x->intersect, &xi);
}
kvi_destroy(xi);
}
static MTNode *merge_node(MarkTree *b, MTNode *p, int i)
{
MTNode *x = p->ptr[i], *y = p->ptr[i + 1];
Intersection m;
kvi_init(m);
intersect_merge(&m, &x->intersect, &y->intersect);
x->key[x->n] = p->key[i];
refkey(b, x, x->n);
if (i > 0) {
relative(p->key[i - 1].pos, &x->key[x->n].pos);
}
memmove(&x->key[x->n + 1], y->key, (size_t)y->n * sizeof(MTKey));
for (int k = 0; k < y->n; k++) {
refkey(b, x, x->n + 1 + k);
unrelative(x->key[x->n].pos, &x->key[x->n + 1 + k].pos);
}
if (x->level) {
// bubble down: ranges that intersected old-x but not old-y or vice versa
// must be moved to their respective children
memmove(&x->ptr[x->n + 1], y->ptr, ((size_t)y->n + 1) * sizeof(MTNode *));
for (int k = 0; k < x->n + 1; k++) {
// TODO(bfredl): dedicated impl for "Z |= Y"
for (size_t idx = 0; idx < kv_size(x->intersect); idx++) {
intersect_node(b, x->ptr[k], kv_A(x->intersect, idx));
}
}
for (int ky = 0; ky < y->n + 1; ky++) {
int k = x->n + ky + 1;
// nodes that used to be in y, now the second half of x
x->ptr[k]->parent = x;
x->ptr[k]->p_idx = (int16_t)k;
// TODO(bfredl): dedicated impl for "Z |= X"
for (size_t idx = 0; idx < kv_size(y->intersect); idx++) {
intersect_node(b, x->ptr[k], kv_A(y->intersect, idx));
}
}
}
x->n += y->n + 1;
memmove(&p->key[i], &p->key[i + 1], (size_t)(p->n - i - 1) * sizeof(MTKey));
memmove(&p->ptr[i + 1], &p->ptr[i + 2],
(size_t)(p->n - i - 1) * sizeof(MTKey *));
for (int j = i + 1; j < p->n; j++) { // note: one has been deleted
p->ptr[j]->p_idx = (int16_t)j;
}
p->n--;
marktree_free_node(b, y);
kvi_destroy(x->intersect);
// move of a kvec_withinit_t, messy!
// TODO(bfredl): special case version of intersect_merge(x_out, x_in_m_out, y) to avoid this
kvi_move(&x->intersect, &m);
return x;
}
/// @param dest is overwritten (assumed to already been freed/moved)
/// @param src consumed (don't free or use)
void kvi_move(Intersection *dest, Intersection *src)
{
dest->size = src->size;
dest->capacity = src->capacity;
if (src->items == src->init_array) {
memcpy(dest->init_array, src->init_array, src->size * sizeof(*src->init_array));
dest->items = dest->init_array;
} else {
dest->items = src->items;
}
}
// TODO(bfredl): as a potential "micro" optimization, pivoting should balance
// the two nodes instead of stealing just one key
// x_pos is the absolute position of the key just before x (or a dummy key strictly less than any
// key inside x, if x is the first leaf)
static void pivot_right(MarkTree *b, MTPos p_pos, MTNode *p, const int i)
{
MTNode *x = p->ptr[i], *y = p->ptr[i + 1];
memmove(&y->key[1], y->key, (size_t)y->n * sizeof(MTKey));
if (y->level) {
memmove(&y->ptr[1], y->ptr, ((size_t)y->n + 1) * sizeof(MTNode *));
for (int j = 1; j < y->n + 2; j++) {
y->ptr[j]->p_idx = (int16_t)j;
}
}
y->key[0] = p->key[i];
refkey(b, y, 0);
p->key[i] = x->key[x->n - 1];
refkey(b, p, i);
if (x->level) {
y->ptr[0] = x->ptr[x->n];
y->ptr[0]->parent = y;
y->ptr[0]->p_idx = 0;
}
x->n--;
y->n++;
if (i > 0) {
unrelative(p->key[i - 1].pos, &p->key[i].pos);
}
relative(p->key[i].pos, &y->key[0].pos);
for (int k = 1; k < y->n; k++) {
unrelative(y->key[0].pos, &y->key[k].pos);
}
// repair intersections of x
if (x->level) {
// handle y and first new y->ptr[0]
Intersection d;
kvi_init(d);
// y->ptr[0] was moved from x to y
// adjust y->ptr[0] for a difference between the parents
// in addition, this might cause some intersection of the old y
// to bubble down to the old children of y (if y->ptr[0] wasn't intersected)
intersect_mov(&x->intersect, &y->intersect, &y->ptr[0]->intersect, &d);
if (kv_size(d)) {
for (int yi = 1; yi < y->n + 1; yi++) {
intersect_add(&y->ptr[yi]->intersect, &d);
}
}
kvi_destroy(d);
bubble_up(x);
} else {
// if the last element of x used to be an end node, check if it now covers all of x
if (mt_end(p->key[i])) {
uint64_t pi = pseudo_index(x, 0); // note: sloppy pseudo-index
uint64_t start_id = mt_lookup_key_side(p->key[i], false);
uint64_t pi_start = pseudo_index_for_id(b, start_id, true);
if (pi_start > 0 && pi_start < pi) {
intersect_node(b, x, start_id);
}
}
if (mt_start(y->key[0])) {
// no need for a check, just delet it if it was there
unintersect_node(b, y, mt_lookup_key(y->key[0]), false);
}
}
}
static void pivot_left(MarkTree *b, MTPos p_pos, MTNode *p, int i)
{
MTNode *x = p->ptr[i], *y = p->ptr[i + 1];
// reverse from how we "always" do it. but pivot_left
// is just the inverse of pivot_right, so reverse it literally.
for (int k = 1; k < y->n; k++) {
relative(y->key[0].pos, &y->key[k].pos);
}
unrelative(p->key[i].pos, &y->key[0].pos);
if (i > 0) {
relative(p->key[i - 1].pos, &p->key[i].pos);
}
x->key[x->n] = p->key[i];
refkey(b, x, x->n);
p->key[i] = y->key[0];
refkey(b, p, i);
if (x->level) {
x->ptr[x->n + 1] = y->ptr[0];
x->ptr[x->n + 1]->parent = x;
x->ptr[x->n + 1]->p_idx = (int16_t)(x->n + 1);
}
memmove(y->key, &y->key[1], (size_t)(y->n - 1) * sizeof(MTKey));
if (y->level) {
memmove(y->ptr, &y->ptr[1], (size_t)y->n * sizeof(MTNode *));
for (int j = 0; j < y->n; j++) { // note: last item deleted
y->ptr[j]->p_idx = (int16_t)j;
}
}
x->n++;
y->n--;
// repair intersections of x,y
if (x->level) {
// handle y and first new y->ptr[0]
Intersection d;
kvi_init(d);
// x->ptr[x->n] was moved from y to x
// adjust x->ptr[x->n] for a difference between the parents
// in addition, this might cause some intersection of the old x
// to bubble down to the old children of x (if x->ptr[n] wasn't intersected)
intersect_mov(&y->intersect, &x->intersect, &x->ptr[x->n]->intersect, &d);
if (kv_size(d)) {
for (int xi = 0; xi < x->n; xi++) { // ptr[x->n| deliberately skipped
intersect_add(&x->ptr[xi]->intersect, &d);
}
}
kvi_destroy(d);
bubble_up(y);
} else {
// if the first element of y used to be an start node, check if it now covers all of y
if (mt_start(p->key[i])) {
uint64_t pi = pseudo_index(y, 0); // note: sloppy pseudo-index
uint64_t end_id = mt_lookup_key_side(p->key[i], true);
uint64_t pi_end = pseudo_index_for_id(b, end_id, true);
if (pi_end > pi) {
intersect_node(b, y, mt_lookup_key(p->key[i]));
}
}
if (mt_end(x->key[x->n - 1])) {
// no need for a check, just delet it if it was there
unintersect_node(b, x, mt_lookup_key_side(x->key[x->n - 1], false), false);
}
}
}
/// frees all mem, resets tree to valid empty state
void marktree_clear(MarkTree *b)
{
if (b->root) {
marktree_free_subtree(b, b->root);
b->root = NULL;
}
map_destroy(uint64_t, b->id2node);
*b->id2node = (PMap(uint64_t)) MAP_INIT;
b->n_keys = 0;
assert(b->n_nodes == 0);
}
void marktree_free_subtree(MarkTree *b, MTNode *x)
{
if (x->level) {
for (int i = 0; i < x->n + 1; i++) {
marktree_free_subtree(b, x->ptr[i]);
}
}
marktree_free_node(b, x);
}
static void marktree_free_node(MarkTree *b, MTNode *x)
{
kvi_destroy(x->intersect);
xfree(x);
b->n_nodes--;
}
/// NB: caller must check not pair!
void marktree_revise(MarkTree *b, MarkTreeIter *itr, uint8_t decor_level, MTKey key)
{
// TODO(bfredl): clean up this mess and re-instantiate &= and |= forms
// once we upgrade to a non-broken version of gcc in functionaltest-lua CI
rawkey(itr).flags = (uint16_t)(rawkey(itr).flags & (uint16_t) ~MT_FLAG_DECOR_MASK);
rawkey(itr).flags = (uint16_t)(rawkey(itr).flags
| (uint16_t)(decor_level << MT_FLAG_DECOR_OFFSET)
| (uint16_t)(key.flags & MT_FLAG_DECOR_MASK));
rawkey(itr).decor_full = key.decor_full;
rawkey(itr).hl_id = key.hl_id;
rawkey(itr).priority = key.priority;
}
/// @param itr iterator is invalid after call
void marktree_move(MarkTree *b, MarkTreeIter *itr, int row, int col)
{
MTKey key = rawkey(itr);
MTNode *x = itr->x;
if (!x->level) {
bool internal = false;
MTPos newpos = MTPos(row, col);
if (x->parent != NULL) {
// strictly _after_ key before `x`
// (not optimal when x is very first leaf of the entire tree, but that's fine)
if (pos_less(itr->pos, newpos)) {
relative(itr->pos, &newpos);
// strictly before the end of x. (this could be made sharper by
// finding the internal key just after x, but meh)
if (pos_less(newpos, x->key[x->n - 1].pos)) {
internal = true;
}
}
} else {
// tree is one node. newpos thus is already "relative" itr->pos
internal = true;
}
if (internal) {
if (key.pos.row == newpos.row && key.pos.col == newpos.col) {
return;
}
key.pos = newpos;
bool match;
// tricky: could minimize movement in either direction better
int new_i = marktree_getp_aux(x, key, &match);
if (!match) {
new_i++;
}
if (new_i == itr->i) {
x->key[itr->i].pos = newpos;
} else if (new_i < itr->i) {
memmove(&x->key[new_i + 1], &x->key[new_i], sizeof(MTKey) * (size_t)(itr->i - new_i));
x->key[new_i] = key;
} else if (new_i > itr->i) {
memmove(&x->key[itr->i], &x->key[itr->i + 1], sizeof(MTKey) * (size_t)(new_i - itr->i - 1));
x->key[new_i - 1] = key;
}
return;
}
}
uint64_t other = marktree_del_itr(b, itr, false);
key.pos = (MTPos){ row, col };
marktree_put_key(b, key);
if (other) {
marktree_restore_pair(b, key);
}
itr->x = NULL; // itr might become invalid by put
}
void marktree_restore_pair(MarkTree *b, MTKey key)
{
MarkTreeIter itr[1];
MarkTreeIter end_itr[1];
marktree_lookup(b, mt_lookup_key_side(key, false), itr);
marktree_lookup(b, mt_lookup_key_side(key, true), end_itr);
if (!itr->x || !end_itr->x) {
// this could happen if the other end is waiting to be restored later
// this function will be called again for the other end.
return;
}
rawkey(itr).flags &= (uint16_t) ~MT_FLAG_ORPHANED;
rawkey(end_itr).flags &= (uint16_t) ~MT_FLAG_ORPHANED;
marktree_intersect_pair(b, mt_lookup_key_side(key, false), itr, end_itr, false);
}
// itr functions
bool marktree_itr_get(MarkTree *b, int32_t row, int col, MarkTreeIter *itr)
{
return marktree_itr_get_ext(b, MTPos(row, col), itr, false, false, NULL);
}
bool marktree_itr_get_ext(MarkTree *b, MTPos p, MarkTreeIter *itr, bool last, bool gravity,
MTPos *oldbase)
{
if (b->n_keys == 0) {
itr->x = NULL;
return false;
}
MTKey k = { .pos = p, .flags = gravity ? MT_FLAG_RIGHT_GRAVITY : 0 };
if (last && !gravity) {
k.flags = MT_FLAG_LAST;
}
itr->pos = (MTPos){ 0, 0 };
itr->x = b->root;
itr->lvl = 0;
if (oldbase) {
oldbase[itr->lvl] = itr->pos;
}
while (true) {
itr->i = marktree_getp_aux(itr->x, k, 0) + 1;
if (itr->x->level == 0) {
break;
}
itr->s[itr->lvl].i = itr->i;
itr->s[itr->lvl].oldcol = itr->pos.col;
if (itr->i > 0) {
compose(&itr->pos, itr->x->key[itr->i - 1].pos);
relative(itr->x->key[itr->i - 1].pos, &k.pos);
}
itr->x = itr->x->ptr[itr->i];
itr->lvl++;
if (oldbase) {
oldbase[itr->lvl] = itr->pos;
}
}
if (last) {
return marktree_itr_prev(b, itr);
} else if (itr->i >= itr->x->n) {
return marktree_itr_next(b, itr);
}
return true;
}
bool marktree_itr_first(MarkTree *b, MarkTreeIter *itr)
{
if (b->n_keys == 0) {
itr->x = NULL;
return false;
}
itr->x = b->root;
itr->i = 0;
itr->lvl = 0;
itr->pos = MTPos(0, 0);
while (itr->x->level > 0) {
itr->s[itr->lvl].i = 0;
itr->s[itr->lvl].oldcol = 0;
itr->lvl++;
itr->x = itr->x->ptr[0];
}
return true;
}
// gives the first key that is greater or equal to p
int marktree_itr_last(MarkTree *b, MarkTreeIter *itr)
{
if (b->n_keys == 0) {
itr->x = NULL;
return false;
}
itr->pos = MTPos(0, 0);
itr->x = b->root;
itr->lvl = 0;
while (true) {
itr->i = itr->x->n;
if (itr->x->level == 0) {
break;
}
itr->s[itr->lvl].i = itr->i;
itr->s[itr->lvl].oldcol = itr->pos.col;
assert(itr->i > 0);
compose(&itr->pos, itr->x->key[itr->i - 1].pos);
itr->x = itr->x->ptr[itr->i];
itr->lvl++;
}
itr->i--;
return true;
}
bool marktree_itr_next(MarkTree *b, MarkTreeIter *itr)
{
return marktree_itr_next_skip(b, itr, false, false, NULL);
}
static bool marktree_itr_next_skip(MarkTree *b, MarkTreeIter *itr, bool skip, bool preload,
MTPos oldbase[])
{
if (!itr->x) {
return false;
}
itr->i++;
if (itr->x->level == 0 || skip) {
if (preload && itr->x->level == 0 && skip) {
// skip rest of this leaf node
itr->i = itr->x->n;
} else if (itr->i < itr->x->n) {
// TODO(bfredl): this is the common case,
// and could be handled by inline wrapper
return true;
}
// we ran out of non-internal keys. Go up until we find an internal key
while (itr->i >= itr->x->n) {
itr->x = itr->x->parent;
if (itr->x == NULL) {
return false;
}
itr->lvl--;
itr->i = itr->s[itr->lvl].i;
if (itr->i > 0) {
itr->pos.row -= itr->x->key[itr->i - 1].pos.row;
itr->pos.col = itr->s[itr->lvl].oldcol;
}
}
} else {
// we stood at an "internal" key. Go down to the first non-internal
// key after it.
while (itr->x->level > 0) {
// internal key, there is always a child after
if (itr->i > 0) {
itr->s[itr->lvl].oldcol = itr->pos.col;
compose(&itr->pos, itr->x->key[itr->i - 1].pos);
}
if (oldbase && itr->i == 0) {
oldbase[itr->lvl + 1] = oldbase[itr->lvl];
}
itr->s[itr->lvl].i = itr->i;
assert(itr->x->ptr[itr->i]->parent == itr->x);
itr->lvl++;
itr->x = itr->x->ptr[itr->i];
if (preload && itr->x->level) {
itr->i = -1;
break;
} else {
itr->i = 0;
}
}
}
return true;
}
bool marktree_itr_prev(MarkTree *b, MarkTreeIter *itr)
{
if (!itr->x) {
return false;
}
if (itr->x->level == 0) {
itr->i--;
if (itr->i >= 0) {
// TODO(bfredl): this is the common case,
// and could be handled by inline wrapper
return true;
}
// we ran out of non-internal keys. Go up until we find a non-internal key
while (itr->i < 0) {
itr->x = itr->x->parent;
if (itr->x == NULL) {
return false;
}
itr->lvl--;
itr->i = itr->s[itr->lvl].i - 1;
if (itr->i >= 0) {
itr->pos.row -= itr->x->key[itr->i].pos.row;
itr->pos.col = itr->s[itr->lvl].oldcol;
}
}
} else {
// we stood at an "internal" key. Go down to the last non-internal
// key before it.
while (itr->x->level > 0) {
// internal key, there is always a child before
if (itr->i > 0) {
itr->s[itr->lvl].oldcol = itr->pos.col;
compose(&itr->pos, itr->x->key[itr->i - 1].pos);
}
itr->s[itr->lvl].i = itr->i;
assert(itr->x->ptr[itr->i]->parent == itr->x);
itr->x = itr->x->ptr[itr->i];
itr->i = itr->x->n;
itr->lvl++;
}
itr->i--;
}
return true;
}
bool marktree_itr_node_done(MarkTreeIter *itr)
{
return !itr->x || itr->i == itr->x->n - 1;
}
MTPos marktree_itr_pos(MarkTreeIter *itr)
{
MTPos pos = rawkey(itr).pos;
unrelative(itr->pos, &pos);
return pos;
}
MTKey marktree_itr_current(MarkTreeIter *itr)
{
if (itr->x) {
MTKey key = rawkey(itr);
key.pos = marktree_itr_pos(itr);
return key;
}
return MT_INVALID_KEY;
}
static bool itr_eq(MarkTreeIter *itr1, MarkTreeIter *itr2)
{
return (&rawkey(itr1) == &rawkey(itr2));
}
/// Get all marks which overlaps the position (row,col)
///
/// After calling this function, use marktree_itr_step_overlap to step through
/// one overlapping mark at a time, until it returns false
///
/// NOTE: It's possible to get all marks which overlaps a region (row,col) to (row_end,col_end)
/// To do this, first call marktree_itr_get_overlap with the start position and
/// keep calling marktree_itr_step_overlap until it returns false.
/// After this, as a second loop, keep calling the marktree_itr_next() until
/// the iterator is invalid or reaches past (row_end, col_end). In this loop,
/// consider all "start" marks (and unpaired marks if relevant), but skip over
/// all "end" marks, using mt_end(mark).
///
/// @return false if we already know no marks can be found
/// even if "true" the first call to marktree_itr_step_overlap
/// could return false
bool marktree_itr_get_overlap(MarkTree *b, int row, int col, MarkTreeIter *itr)
{
if (b->n_keys == 0) {
itr->x = NULL;
return false;
}
itr->x = b->root;
itr->i = -1;
itr->lvl = 0;
itr->pos = MTPos(0, 0);
itr->intersect_pos = MTPos(row, col);
// intersect_pos but will be adjusted relative itr->x
itr->intersect_pos_x = MTPos(row, col);
itr->intersect_idx = 0;
return true;
}
static inline MTPair pair_from(MTKey start, MTKey end)
{
return (MTPair){ .start = start, .end_pos = end.pos, .end_right_gravity = mt_right(end) };
}
/// Step through all overlapping pairs at a position.
///
/// This function must only be used with an iterator from |marktree_itr_step_overlap|
///
/// @return true if a valid pair was found (returned as `pair`)
/// When all overlapping mark pairs have been found, false will be returned. `itr`
/// is then valid as an ordinary iterator at the (row, col) position specified in
/// marktree_itr_step_overlap
bool marktree_itr_step_overlap(MarkTree *b, MarkTreeIter *itr, MTPair *pair)
{
// phase one: we start at the root node and step inwards towards itr->intersect_pos
// (the position queried in marktree_itr_get_overlap)
//
// For each node (ancestor node to the node containing the sought position)
// we return all intersecting intervals, one at a time
while (itr->i == -1) {
if (itr->intersect_idx < kv_size(itr->x->intersect)) {
uint64_t id = kv_A(itr->x->intersect, itr->intersect_idx++);
*pair = pair_from(marktree_lookup(b, id, NULL),
marktree_lookup(b, id|MARKTREE_END_FLAG, NULL));
return true;
}
if (itr->x->level == 0) {
itr->s[itr->lvl].i = itr->i = 0;
break;
}
MTKey k = { .pos = itr->intersect_pos_x, .flags = 0 };
itr->i = marktree_getp_aux(itr->x, k, 0) + 1;
itr->s[itr->lvl].i = itr->i;
itr->s[itr->lvl].oldcol = itr->pos.col;
if (itr->i > 0) {
compose(&itr->pos, itr->x->key[itr->i - 1].pos);
relative(itr->x->key[itr->i - 1].pos, &itr->intersect_pos_x);
}
itr->x = itr->x->ptr[itr->i];
itr->lvl++;
itr->i = -1;
itr->intersect_idx = 0;
}
// phase two: we now need to handle the node found at itr->intersect_pos
// first consider all start nodes in the node before this position.
while (itr->i < itr->x->n && pos_less(rawkey(itr).pos, itr->intersect_pos_x)) {
MTKey k = itr->x->key[itr->i++];
itr->s[itr->lvl].i = itr->i;
if (mt_start(k)) {
MTKey end = marktree_lookup(b, mt_lookup_id(k.ns, k.id, true), NULL);
if (pos_less(end.pos, itr->intersect_pos)) {
continue;
}
unrelative(itr->pos, &k.pos);
*pair = pair_from(k, end);
return true; // it's a start!
}
}
// phase 2B: We also need to step to the end of this node and consider all end marks, which
// might end an interval overlapping itr->intersect_pos
while (itr->i < itr->x->n) {
MTKey k = itr->x->key[itr->i++];
if (mt_end(k)) {
uint64_t id = mt_lookup_id(k.ns, k.id, false);
if (id2node(b, id) == itr->x) {
continue;
}
unrelative(itr->pos, &k.pos);
MTKey start = marktree_lookup(b, id, NULL);
if (pos_less(itr->intersect_pos, start.pos)) {
continue;
}
*pair = pair_from(start, k);
return true; // end of a range which began before us!
}
}
// when returning false, get back to the queried position, to ensure the caller
// can keep using it as an ordinary iterator at the queried position. The docstring
// for marktree_itr_get_overlap explains how this is useful.
itr->i = itr->s[itr->lvl].i;
assert(itr->i >= 0);
if (itr->i >= itr->x->n) {
marktree_itr_next(b, itr);
}
// either on or after the intersected position, bail out
return false;
}
static void swap_keys(MarkTree *b, MarkTreeIter *itr1, MarkTreeIter *itr2, DamageList *damage)
{
if (itr1->x != itr2->x) {
if (mt_paired(rawkey(itr1))) {
kvi_push(*damage, ((Damage){ mt_lookup_key(rawkey(itr1)), itr1->x, itr2->x,
itr1->i, itr2->i }));
}
if (mt_paired(rawkey(itr2))) {
kvi_push(*damage, ((Damage){ mt_lookup_key(rawkey(itr2)), itr2->x, itr1->x,
itr2->i, itr1->i }));
}
}
MTKey key1 = rawkey(itr1);
MTKey key2 = rawkey(itr2);
rawkey(itr1) = key2;
rawkey(itr1).pos = key1.pos;
rawkey(itr2) = key1;
rawkey(itr2).pos = key2.pos;
refkey(b, itr1->x, itr1->i);
refkey(b, itr2->x, itr2->i);
}
static int damage_cmp(const void *s1, const void *s2)
{
Damage *d1 = (Damage *)s1, *d2 = (Damage *)s2;
assert(d1->id != d2->id);
return d1->id > d2->id;
}
bool marktree_splice(MarkTree *b, int32_t start_line, int start_col, int old_extent_line,
int old_extent_col, int new_extent_line, int new_extent_col)
{
MTPos start = { start_line, start_col };
MTPos old_extent = { old_extent_line, old_extent_col };
MTPos new_extent = { new_extent_line, new_extent_col };
bool may_delete = (old_extent.row != 0 || old_extent.col != 0);
bool same_line = old_extent.row == 0 && new_extent.row == 0;
unrelative(start, &old_extent);
unrelative(start, &new_extent);
MarkTreeIter itr[1] = { 0 }, enditr[1] = { 0 };
MTPos oldbase[MT_MAX_DEPTH] = { 0 };
marktree_itr_get_ext(b, start, itr, false, true, oldbase);
if (!itr->x) {
// den e FÄRDIG
return false;
}
MTPos delta = { new_extent.row - old_extent.row,
new_extent.col - old_extent.col };
if (may_delete) {
MTPos ipos = marktree_itr_pos(itr);
if (!pos_leq(old_extent, ipos)
|| (old_extent.row == ipos.row && old_extent.col == ipos.col
&& !mt_right(rawkey(itr)))) {
marktree_itr_get_ext(b, old_extent, enditr, true, true, NULL);
assert(enditr->x);
// "assert" (itr <= enditr)
} else {
may_delete = false;
}
}
bool past_right = false;
bool moved = false;
DamageList damage;
kvi_init(damage);
// Follow the general strategy of messing things up and fix them later
// "oldbase" carries the information needed to calculate old position of
// children.
if (may_delete) {
while (itr->x && !past_right) {
MTPos loc_start = start;
MTPos loc_old = old_extent;
relative(itr->pos, &loc_start);
relative(oldbase[itr->lvl], &loc_old);
continue_same_node:
// NB: strictly should be less than the right gravity of loc_old, but
// the iter comparison below will already break on that.
if (!pos_leq(rawkey(itr).pos, loc_old)) {
break;
}
if (mt_right(rawkey(itr))) {
while (!itr_eq(itr, enditr)
&& mt_right(rawkey(enditr))) {
marktree_itr_prev(b, enditr);
}
if (!mt_right(rawkey(enditr))) {
swap_keys(b, itr, enditr, &damage);
} else {
past_right = true; // NOLINT
(void)past_right;
break;
}
}
if (itr_eq(itr, enditr)) {
// actually, will be past_right after this key
past_right = true;
}
moved = true;
if (itr->x->level) {
oldbase[itr->lvl + 1] = rawkey(itr).pos;
unrelative(oldbase[itr->lvl], &oldbase[itr->lvl + 1]);
rawkey(itr).pos = loc_start;
marktree_itr_next_skip(b, itr, false, false, oldbase);
} else {
rawkey(itr).pos = loc_start;
if (itr->i < itr->x->n - 1) {
itr->i++;
if (!past_right) {
goto continue_same_node;
}
} else {
marktree_itr_next(b, itr);
}
}
}
while (itr->x) {
MTPos loc_new = new_extent;
relative(itr->pos, &loc_new);
MTPos limit = old_extent;
relative(oldbase[itr->lvl], &limit);
past_continue_same_node:
if (pos_leq(limit, rawkey(itr).pos)) {
break;
}
MTPos oldpos = rawkey(itr).pos;
rawkey(itr).pos = loc_new;
moved = true;
if (itr->x->level) {
oldbase[itr->lvl + 1] = oldpos;
unrelative(oldbase[itr->lvl], &oldbase[itr->lvl + 1]);
marktree_itr_next_skip(b, itr, false, false, oldbase);
} else {
if (itr->i < itr->x->n - 1) {
itr->i++;
goto past_continue_same_node;
} else {
marktree_itr_next(b, itr);
}
}
}
}
while (itr->x) {
unrelative(oldbase[itr->lvl], &rawkey(itr).pos);
int realrow = rawkey(itr).pos.row;
assert(realrow >= old_extent.row);
bool done = false;
if (realrow == old_extent.row) {
if (delta.col) {
rawkey(itr).pos.col += delta.col;
}
} else {
if (same_line) {
// optimization: column only adjustment can skip remaining rows
done = true;
}
}
if (delta.row) {
rawkey(itr).pos.row += delta.row;
moved = true;
}
relative(itr->pos, &rawkey(itr).pos);
if (done) {
break;
}
marktree_itr_next_skip(b, itr, true, false, NULL);
}
if (kv_size(damage)) {
// TODO(bfredl): a full sort is not really needed. we just need a "start" node to find
// its corresponding "end" node. Set up some dedicated hash for this later (c.f. the
// "grow only" variant of khash_t branch)
qsort((void *)&kv_A(damage, 0), kv_size(damage), sizeof(kv_A(damage, 0)),
damage_cmp);
for (size_t i = 0; i < kv_size(damage); i++) {
Damage d = kv_A(damage, i);
if (!(d.id & MARKTREE_END_FLAG)) { // start
if (i + 1 < kv_size(damage) && kv_A(damage, i + 1).id == (d.id | MARKTREE_END_FLAG)) {
Damage d2 = kv_A(damage, i + 1);
// pair
marktree_itr_set_node(b, itr, d.old, d.old_i);
marktree_itr_set_node(b, enditr, d2.old, d2.old_i);
marktree_intersect_pair(b, d.id, itr, enditr, true);
marktree_itr_set_node(b, itr, d.new, d.new_i);
marktree_itr_set_node(b, enditr, d2.new, d2.new_i);
marktree_intersect_pair(b, d.id, itr, enditr, false);
i++; // consume two items
continue;
}
// d is lone start, end didn't move
MarkTreeIter endpos[1];
marktree_lookup(b, d.id | MARKTREE_END_FLAG, endpos);
if (endpos->x) {
marktree_itr_set_node(b, itr, d.old, d.old_i);
*enditr = *endpos;
marktree_intersect_pair(b, d.id, itr, enditr, true);
marktree_itr_set_node(b, itr, d.new, d.new_i);
*enditr = *endpos;
marktree_intersect_pair(b, d.id, itr, enditr, false);
}
} else {
// d is lone end, start didn't move
MarkTreeIter startpos[1];
uint64_t start_id = d.id & ~MARKTREE_END_FLAG;
marktree_lookup(b, start_id, startpos);
if (startpos->x) {
*itr = *startpos;
marktree_itr_set_node(b, enditr, d.old, d.old_i);
marktree_intersect_pair(b, start_id, itr, enditr, true);
*itr = *startpos;
marktree_itr_set_node(b, enditr, d.new, d.new_i);
marktree_intersect_pair(b, start_id, itr, enditr, false);
}
}
}
}
kvi_destroy(damage);
return moved;
}
void marktree_move_region(MarkTree *b, int start_row, colnr_T start_col, int extent_row,
colnr_T extent_col, int new_row, colnr_T new_col)
{
MTPos start = { start_row, start_col }, size = { extent_row, extent_col };
MTPos end = size;
unrelative(start, &end);
MarkTreeIter itr[1] = { 0 };
marktree_itr_get_ext(b, start, itr, false, true, NULL);
kvec_t(MTKey) saved = KV_INITIAL_VALUE;
while (itr->x) {
MTKey k = marktree_itr_current(itr);
if (!pos_leq(k.pos, end) || (k.pos.row == end.row && k.pos.col == end.col
&& mt_right(k))) {
break;
}
relative(start, &k.pos);
kv_push(saved, k);
marktree_del_itr(b, itr, false);
}
marktree_splice(b, start.row, start.col, size.row, size.col, 0, 0);
MTPos new = { new_row, new_col };
marktree_splice(b, new.row, new.col,
0, 0, size.row, size.col);
for (size_t i = 0; i < kv_size(saved); i++) {
MTKey item = kv_A(saved, i);
unrelative(new, &item.pos);
marktree_put_key(b, item);
if (mt_paired(item)) {
// other end might be later in `saved`, this will safely bail out then
marktree_restore_pair(b, item);
}
}
kv_destroy(saved);
}
/// @param itr OPTIONAL. set itr to pos.
MTKey marktree_lookup_ns(MarkTree *b, uint32_t ns, uint32_t id, bool end, MarkTreeIter *itr)
{
return marktree_lookup(b, mt_lookup_id(ns, id, end), itr);
}
static uint64_t pseudo_index(MTNode *x, int i)
{
int off = MT_LOG2_BRANCH * x->level;
uint64_t index = 0;
while (x) {
index |= (uint64_t)(i + 1) << off;
off += MT_LOG2_BRANCH;
i = x->p_idx;
x = x->parent;
}
return index;
}
/// @param itr OPTIONAL. set itr to pos.
/// if sloppy, two keys at the same _leaf_ node has the same index
static uint64_t pseudo_index_for_id(MarkTree *b, uint64_t id, bool sloppy)
{
MTNode *n = id2node(b, id);
if (n == NULL) {
return 0; // a valid pseudo-index is never zero!
}
int i = 0;
if (n->level || !sloppy) {
for (i = 0; i < n->n; i++) {
if (mt_lookup_key(n->key[i]) == id) {
break;
}
}
assert(i < n->n);
if (n->level) {
i += 1; // internal key i comes after ptr[i]
}
}
return pseudo_index(n, i);
}
/// @param itr OPTIONAL. set itr to pos.
MTKey marktree_lookup(MarkTree *b, uint64_t id, MarkTreeIter *itr)
{
MTNode *n = id2node(b, id);
if (n == NULL) {
if (itr) {
itr->x = NULL;
}
return MT_INVALID_KEY;
}
int i = 0;
for (i = 0; i < n->n; i++) {
if (mt_lookup_key(n->key[i]) == id) {
return marktree_itr_set_node(b, itr, n, i);
}
}
abort();
}
MTKey marktree_itr_set_node(MarkTree *b, MarkTreeIter *itr, MTNode *n, int i)
{
MTKey key = n->key[i];
if (itr) {
itr->i = i;
itr->x = n;
itr->lvl = b->root->level - n->level;
}
while (n->parent != NULL) {
MTNode *p = n->parent;
i = n->p_idx;
assert(p->ptr[i] == n);
if (itr) {
itr->s[b->root->level - p->level].i = i;
}
if (i > 0) {
unrelative(p->key[i - 1].pos, &key.pos);
}
n = p;
}
if (itr) {
marktree_itr_fix_pos(b, itr);
}
return key;
}
MTPos marktree_get_altpos(MarkTree *b, MTKey mark, MarkTreeIter *itr)
{
return marktree_get_alt(b, mark, itr).pos;
}
MTKey marktree_get_alt(MarkTree *b, MTKey mark, MarkTreeIter *itr)
{
MTKey end = MT_INVALID_KEY;
if (mt_paired(mark)) {
end = marktree_lookup_ns(b, mark.ns, mark.id, !mt_end(mark), itr);
}
return end;
}
static void marktree_itr_fix_pos(MarkTree *b, MarkTreeIter *itr)
{
itr->pos = (MTPos){ 0, 0 };
MTNode *x = b->root;
for (int lvl = 0; lvl < itr->lvl; lvl++) {
itr->s[lvl].oldcol = itr->pos.col;
int i = itr->s[lvl].i;
if (i > 0) {
compose(&itr->pos, x->key[i - 1].pos);
}
assert(x->level);
x = x->ptr[i];
}
assert(x == itr->x);
}
// for unit test
void marktree_put_test(MarkTree *b, uint32_t ns, uint32_t id, int row, int col, bool right_gravity,
int end_row, int end_col, bool end_right)
{
MTKey key = { { row, col }, ns, id, 0,
mt_flags(right_gravity, 0), 0, NULL };
marktree_put(b, key, end_row, end_col, end_right);
}
// for unit test
bool mt_right_test(MTKey key)
{
return mt_right(key);
}
// for unit test
void marktree_del_pair_test(MarkTree *b, uint32_t ns, uint32_t id)
{
MarkTreeIter itr[1];
marktree_lookup_ns(b, ns, id, false, itr);
uint64_t other = marktree_del_itr(b, itr, false);
assert(other);
marktree_lookup(b, other, itr);
marktree_del_itr(b, itr, false);
}
void marktree_check(MarkTree *b)
{
#ifndef NDEBUG
if (b->root == NULL) {
assert(b->n_keys == 0);
assert(b->n_nodes == 0);
assert(b->id2node == NULL || map_size(b->id2node) == 0);
return;
}
MTPos dummy;
bool last_right = false;
size_t nkeys = marktree_check_node(b, b->root, &dummy, &last_right);
assert(b->n_keys == nkeys);
assert(b->n_keys == map_size(b->id2node));
#else
// Do nothing, as assertions are required
(void)b;
#endif
}
#ifndef NDEBUG
size_t marktree_check_node(MarkTree *b, MTNode *x, MTPos *last, bool *last_right)
{
assert(x->n <= 2 * T - 1);
// TODO(bfredl): too strict if checking "in repair" post-delete tree.
assert(x->n >= (x != b->root ? T - 1 : 0));
size_t n_keys = (size_t)x->n;
for (int i = 0; i < x->n; i++) {
if (x->level) {
n_keys += marktree_check_node(b, x->ptr[i], last, last_right);
} else {
*last = (MTPos) { 0, 0 };
}
if (i > 0) {
unrelative(x->key[i - 1].pos, last);
}
assert(pos_leq(*last, x->key[i].pos));
if (last->row == x->key[i].pos.row && last->col == x->key[i].pos.col) {
assert(!*last_right || mt_right(x->key[i]));
}
*last_right = mt_right(x->key[i]);
assert(x->key[i].pos.col >= 0);
assert(pmap_get(uint64_t)(b->id2node, mt_lookup_key(x->key[i])) == x);
}
if (x->level) {
n_keys += marktree_check_node(b, x->ptr[x->n], last, last_right);
unrelative(x->key[x->n - 1].pos, last);
for (int i = 0; i < x->n + 1; i++) {
assert(x->ptr[i]->parent == x);
assert(x->ptr[i]->p_idx == i);
assert(x->ptr[i]->level == x->level - 1);
// PARANOIA: check no double node ref
for (int j = 0; j < i; j++) {
assert(x->ptr[i] != x->ptr[j]);
}
}
} else if (x->n > 0) {
*last = x->key[x->n - 1].pos;
}
return n_keys;
}
bool marktree_check_intersections(MarkTree *b)
{
if (!b->root) {
return true;
}
PMap(ptr_t) checked = MAP_INIT;
// 1. move x->intersect to checked[x] and reinit x->intersect
mt_recurse_nodes(b->root, &checked);
// 2. iterate over all marks. for each START mark of a pair,
// intersect the nodes between the pair
MarkTreeIter itr[1];
marktree_itr_first(b, itr);
while (true) {
MTKey mark = marktree_itr_current(itr);
if (mark.pos.row < 0) {
break;
}
if (mt_start(mark)) {
MarkTreeIter start_itr[1];
MarkTreeIter end_itr[1];
uint64_t end_id = mt_lookup_id(mark.ns, mark.id, true);
MTKey k = marktree_lookup(b, end_id, end_itr);
if (k.pos.row >= 0) {
*start_itr = *itr;
marktree_intersect_pair(b, mt_lookup_key(mark), start_itr, end_itr, false);
}
}
marktree_itr_next(b, itr);
}
// 3. for each node check if the recreated intersection
// matches the old checked[x] intersection.
bool status = mt_recurse_nodes_compare(b->root, &checked);
uint64_t *val;
map_foreach_value(&checked, val, {
xfree(val);
});
map_destroy(ptr_t, &checked);
return status;
}
void mt_recurse_nodes(MTNode *x, PMap(ptr_t) *checked)
{
if (kv_size(x->intersect)) {
kvi_push(x->intersect, (uint64_t)-1); // sentinel
uint64_t *val;
if (x->intersect.items == x->intersect.init_array) {
val = xmemdup(x->intersect.items, x->intersect.size * sizeof(*x->intersect.items));
} else {
val = x->intersect.items;
}
pmap_put(ptr_t)(checked, x, val);
kvi_init(x->intersect);
}
if (x->level) {
for (int i = 0; i < x->n + 1; i++) {
mt_recurse_nodes(x->ptr[i], checked);
}
}
}
bool mt_recurse_nodes_compare(MTNode *x, PMap(ptr_t) *checked)
{
uint64_t *ref = pmap_get(ptr_t)(checked, x);
if (ref != NULL) {
for (size_t i = 0;; i++) {
if (ref[i] == (uint64_t)-1) {
if (i != kv_size(x->intersect)) {
return false;
}
break;
} else {
if (kv_size(x->intersect) <= i || ref[i] != kv_A(x->intersect, i)) {
return false;
}
}
}
} else {
if (kv_size(x->intersect)) {
return false;
}
}
if (x->level) {
for (int i = 0; i < x->n + 1; i++) {
if (!mt_recurse_nodes_compare(x->ptr[i], checked)) {
return false;
}
}
}
return true;
}
#endif
// TODO(bfredl): kv_print
#define GA_PUT(x) ga_concat(ga, (char *)(x))
#define GA_PRINT(fmt, ...) snprintf(buf, sizeof(buf), fmt, __VA_ARGS__); \
GA_PUT(buf);
String mt_inspect(MarkTree *b, bool keys, bool dot)
{
garray_T ga[1];
ga_init(ga, (int)sizeof(char), 80);
MTPos p = { 0, 0 };
if (b->root) {
if (dot) {
GA_PUT("digraph D {\n\n");
mt_inspect_dotfile_node(b, ga, b->root, p, NULL);
GA_PUT("\n}");
} else {
mt_inspect_node(b, ga, keys, b->root, p);
}
}
return ga_take_string(ga);
}
void mt_inspect_node(MarkTree *b, garray_T *ga, bool keys, MTNode *n, MTPos off)
{
static char buf[1024];
GA_PUT("[");
if (keys && kv_size(n->intersect)) {
for (size_t i = 0; i < kv_size(n->intersect); i++) {
GA_PUT(i == 0 ? "{" : ";");
// GA_PRINT("%"PRIu64, kv_A(n->intersect, i));
GA_PRINT("%" PRIu64, mt_dbg_id(kv_A(n->intersect, i)));
}
GA_PUT("},");
}
if (n->level) {
mt_inspect_node(b, ga, keys, n->ptr[0], off);
}
for (int i = 0; i < n->n; i++) {
MTPos p = n->key[i].pos;
unrelative(off, &p);
GA_PRINT("%d/%d", p.row, p.col);
if (keys) {
MTKey key = n->key[i];
GA_PUT(":");
if (mt_start(key)) {
GA_PUT("<");
}
// GA_PRINT("%"PRIu64, mt_lookup_id(key.ns, key.id, false));
GA_PRINT("%" PRIu32, key.id);
if (mt_end(key)) {
GA_PUT(">");
}
}
if (n->level) {
mt_inspect_node(b, ga, keys, n->ptr[i + 1], p);
} else {
ga_concat(ga, ",");
}
}
ga_concat(ga, "]");
}
void mt_inspect_dotfile_node(MarkTree *b, garray_T *ga, MTNode *n, MTPos off, char *parent)
{
static char buf[1024];
char namebuf[64];
if (parent != NULL) {
snprintf(namebuf, sizeof namebuf, "%s_%c%d", parent, 'a' + n->level, n->p_idx);
} else {
snprintf(namebuf, sizeof namebuf, "Node");
}
GA_PRINT(" %s[shape=plaintext, label=<\n", namebuf);
GA_PUT(" <table border='0' cellborder='1' cellspacing='0'>\n");
if (kv_size(n->intersect)) {
GA_PUT(" <tr><td>");
for (size_t i = 0; i < kv_size(n->intersect); i++) {
if (i > 0) {
GA_PUT(", ");
}
GA_PRINT("%" PRIu64, mt_dbg_id(kv_A(n->intersect, i)));
}
GA_PUT("</td></tr>\n");
}
GA_PUT(" <tr><td>");
for (int i = 0; i < n->n; i++) {
MTKey k = n->key[i];
if (i > 0) {
GA_PUT(", ");
}
GA_PRINT("%d", k.id);
if (mt_paired(k)) {
GA_PUT(mt_end(k) ? "e" : "s");
}
}
GA_PUT("</td></tr>\n");
GA_PUT(" </table>\n");
GA_PUT(">];\n");
if (parent) {
GA_PRINT(" %s -> %s\n", parent, namebuf);
}
if (n->level) {
mt_inspect_dotfile_node(b, ga, n->ptr[0], off, namebuf);
}
for (int i = 0; i < n->n; i++) {
MTPos p = n->key[i].pos;
unrelative(off, &p);
if (n->level) {
mt_inspect_dotfile_node(b, ga, n->ptr[i + 1], p, namebuf);
}
}
}
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