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comparison runtime/doc/eval.txt @ 32307:8d6f53a07ffd v9.0.1485

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patch 9.0.1485: no functions for converting from/to UTF-16 index Commit: https://github.com/vim/vim/commit/67672ef097dd708244ff042a8364994da2b91e75 Author: Christian Brabandt <cb@256bit.org> Date: Mon Apr 24 21:09:54 2023 +0100 patch 9.0.1485: no functions for converting from/to UTF-16 index Problem: no functions for converting from/to UTF-16 index. Solution: Add UTF-16 flag to existing funtions and add strutf16len() and utf16idx(). (Yegappan Lakshmanan, closes #12216)
author Bram Moolenaar <Bram@vim.org>
date Mon, 24 Apr 2023 22:15:05 +0200
parents b2e8663e6dcc
children 2a17771529af
comparison
equal deleted inserted replaced
32306:6d5e523b5b6a 32307:8d6f53a07ffd
1578 < Hello, Peter! ~ 1578 < Hello, Peter! ~
1579 > 1579 >
1580 echo $"The square root of {{9}} is {sqrt(9)}" 1580 echo $"The square root of {{9}} is {sqrt(9)}"
1581 < The square root of {9} is 3.0 ~ 1581 < The square root of {9} is 3.0 ~
1582 1582
1583 *string-offset-encoding*
1584 A string consists of multiple characters. How the characters are stored
1585 depends on 'encoding'. Most common is UTF-8, which uses one byte for ASCII
1586 characters, two bytes for other latin characters and more bytes for other
1587 characters.
1588
1589 A string offset can count characters or bytes. Other programs may use
1590 UTF-16 encoding (16-bit words) and an offset of UTF-16 words. Some functions
1591 use byte offsets, usually for UTF-8 encoding. Other functions use character
1592 offsets, in which case the encoding doesn't matter.
1593
1594 The different offsets for the string "a©😊" are below:
1595
1596 UTF-8 offsets:
1597 [0]: 61, [1]: C2, [2]: A9, [3]: F0, [4]: 9F, [5]: 98, [6]: 8A
1598 UTF-16 offsets:
1599 [0]: 0061, [1]: 00A9, [2]: D83D, [3]: DE0A
1600 UTF-32 (character) offsets:
1601 [0]: 00000061, [1]: 000000A9, [2]: 0001F60A
1602
1603 You can use the "g8" and "ga" commands on a character to see the
1604 decimal/hex/octal values.
1605
1606 The functions |byteidx()|, |utf16idx()| and |charidx()| can be used to convert
1607 between these indices. The functions |strlen()|, |strutf16len()| and
1608 |strcharlen()| return the number of bytes, UTF-16 code units and characters in
1609 a string respectively.
1583 1610
1584 option *expr-option* *E112* *E113* 1611 option *expr-option* *E112* *E113*
1585 ------ 1612 ------
1586 &option option value, local value if possible 1613 &option option value, local value if possible
1587 &g:option global option value 1614 &g:option global option value