vis

a vi-like editor based on Plan 9's structural regular expressions
text-util.h

(1236B)
      1 #ifndef TEXT_UTIL_H
      2 #define TEXT_UTIL_H
      3 
      4 #include <stdbool.h>
      5 #include <stddef.h>
      6 #include "text.h"
      7 
      8 /* test whether the given range is valid (start <= end) */
      9 bool text_range_valid(const Filerange*);
     10 /* get the size of the range (end-start) or zero if invalid */
     11 size_t text_range_size(const Filerange*);
     12 /* create an empty / invalid range of size zero */
     13 Filerange text_range_empty(void);
     14 /* merge two ranges into a new one which contains both of them */
     15 Filerange text_range_union(const Filerange*, const Filerange*);
     16 /* get intersection of two ranges */
     17 Filerange text_range_intersect(const Filerange*, const Filerange*);
     18 /* create new range [min(a,b), max(a,b)] */
     19 Filerange text_range_new(size_t a, size_t b);
     20 /* test whether two ranges are equal */
     21 bool text_range_equal(const Filerange*, const Filerange*);
     22 /* test whether two ranges overlap */
     23 bool text_range_overlap(const Filerange*, const Filerange*);
     24 /* test whether a given position is within a certain range */
     25 bool text_range_contains(const Filerange*, size_t pos);
     26 /* count the number of graphemes in data */
     27 int text_char_count(const char *data, size_t len);
     28 /* get the approximate display width of data */
     29 int text_string_width(const char *data, size_t len);
     30 
     31 #endif