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55677ddc46
This is inspired by Atom's "marker index" data structure to efficiently adjust marks to text insertions deletions, but uses a wide B-tree (derived from kbtree) to keep the nesting level down.
77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
#ifndef NVIM_MARKTREE_H
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#define NVIM_MARKTREE_H
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#include <stdint.h>
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#include "nvim/map.h"
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#include "nvim/garray.h"
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#define MT_MAX_DEPTH 20
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#define MT_BRANCH_FACTOR 10
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typedef struct {
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int32_t row;
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int32_t col;
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} mtpos_t;
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typedef struct {
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int32_t row;
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int32_t col;
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uint64_t id;
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bool right_gravity;
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} mtmark_t;
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typedef struct mtnode_s mtnode_t;
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typedef struct {
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int oldcol;
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int i;
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} iterstate_t;
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typedef struct {
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mtpos_t pos;
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int lvl;
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mtnode_t *node;
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int i;
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iterstate_t s[MT_MAX_DEPTH];
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} MarkTreeIter;
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// Internal storage
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//
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// NB: actual marks have id > 0, so we can use (row,col,0) pseudo-key for
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// "space before (row,col)"
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typedef struct {
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mtpos_t pos;
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uint64_t id;
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} mtkey_t;
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struct mtnode_s {
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int32_t n;
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int32_t level;
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// TODO(bfredl): we could consider having a only-sometimes-valid
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// index into parent for faster "chached" lookup.
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mtnode_t *parent;
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mtkey_t key[2 * MT_BRANCH_FACTOR - 1];
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mtnode_t *ptr[];
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};
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// TODO(bfredl): the iterator is pretty much everpresent, make it part of the
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// tree struct itself?
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typedef struct {
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mtnode_t *root;
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size_t n_keys, n_nodes;
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uint64_t next_id;
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// TODO(bfredl): the pointer to node could be part of the larger
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// Map(uint64_t, ExtmarkItem) essentially;
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PMap(uint64_t) *id2node;
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} MarkTree;
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#ifdef INCLUDE_GENERATED_DECLARATIONS
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# include "marktree.h.generated.h"
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#endif
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#define MARKTREE_PAIRED_FLAG (((uint64_t)1) << 1)
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#define MARKTREE_END_FLAG (((uint64_t)1) << 0)
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#endif // NVIM_MARKTREE_H
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