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#ifndef BLOCK_ITER_H
#define BLOCK_ITER_H
#include <stdbool.h>
#include <stddef.h>
#include "block.h"
#include "util/list.h"
#include "util/macros.h"
#include "util/string-view.h"
#include "util/unicode.h"
typedef struct {
Block *blk;
const ListHead *head;
size_t offset;
} BlockIter;
static inline void block_iter_bof(BlockIter *bi)
{
bi->blk = BLOCK(bi->head->next);
bi->offset = 0;
}
static inline void block_iter_eof(BlockIter *bi)
{
bi->blk = BLOCK(bi->head->prev);
bi->offset = bi->blk->size;
}
static inline bool block_iter_is_eof(const BlockIter *bi)
{
return bi->offset == bi->blk->size && bi->blk->node.next == bi->head;
}
static inline bool block_iter_is_bol(const BlockIter *bi)
{
return bi->offset == 0 || bi->blk->data[bi->offset - 1] == '\n';
}
static inline bool block_iter_is_eol(const BlockIter *bi)
{
const Block *blk = bi->blk;
size_t offset = bi->offset;
if (offset == blk->size) {
if (blk->node.next == bi->head) {
// EOF
return true;
}
// Normalize
blk = BLOCK(blk->node.next);
offset = 0;
}
return blk->data[offset] == '\n';
}
void block_iter_normalize(BlockIter *bi);
size_t block_iter_eat_line(BlockIter *bi);
size_t block_iter_next_line(BlockIter *bi);
size_t block_iter_prev_line(BlockIter *bi);
size_t block_iter_next_char(BlockIter *bi, CodePoint *up);
size_t block_iter_prev_char(BlockIter *bi, CodePoint *up);
size_t block_iter_next_column(BlockIter *bi);
size_t block_iter_prev_column(BlockIter *bi);
size_t block_iter_bol(BlockIter *bi);
size_t block_iter_eol(BlockIter *bi);
void block_iter_back_bytes(BlockIter *bi, size_t count);
void block_iter_skip_bytes(BlockIter *bi, size_t count);
void block_iter_goto_offset(BlockIter *bi, size_t offset);
void block_iter_goto_line(BlockIter *bi, size_t line);
size_t block_iter_get_offset(const BlockIter *bi) WARN_UNUSED_RESULT;
size_t block_iter_get_char(const BlockIter *bi, CodePoint *up) WARN_UNUSED_RESULT;
char *block_iter_get_bytes(const BlockIter *bi, size_t len) WARN_UNUSED_RESULT;
void fill_line_ref(BlockIter *bi, StringView *line);
void fill_line_nl_ref(BlockIter *bi, StringView *line);
size_t fetch_this_line(const BlockIter *bi, StringView *line);
#endif
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