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vi: allow line addresses to have an offset

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Line addresses in colon commands can be defined using an expression
that includes '+' or '-' operators.  The implementation follows
traditional vi:

- The first term in the expression defines an address.  It can be
  an absolute line number, '.', '$', a search or a marker.

- The second and subsequent terms must be non-negative integers.

- If the first term is missing '.' is assumed.  If the operator is
  missing addition is assumed.  If the final term in missing an
  offset of 1 is assumed.

Thus the following are valid addresses:

  .+1   .+   +   .1
  .-1   .-   -

The following are not valid (though they are in vim):

  .+$   .$   2+.

function                                             old     new   delta
colon                                               3701    3844    +143
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 143/0)             Total: 143 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2021-04-15 12:06:51 +01:00 committed by Denys Vlasenko
parent 47f78913f7
commit f227726838
1 changed files with 75 additions and 49 deletions
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46
editors/vi.c
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@ -2342,18 +2342,23 @@ static char *char_search(char *p, const char *pat, int dir_and_range)
//----- The Colon commands -------------------------------------
#if ENABLE_FEATURE_VI_COLON
static char *get_one_address(char *p, int *addr) // get colon addr, if present
static char *get_one_address(char *p, int *result) // get colon addr, if present
{
int st;
int st, num, sign, addr, new_addr;
# if ENABLE_FEATURE_VI_YANKMARK || ENABLE_FEATURE_VI_SEARCH
char *q, c;
# endif
IF_FEATURE_VI_SEARCH(int dir;)
*addr = -1; // assume no addr
if (*p == '.') { // the current line
addr = -1; // assume no addr
sign = 0;
for (;;) {
new_addr = -1;
if (isblank(*p)) {
p++;
*addr = count_lines(text, dot);
} else if (*p == '.') { // the current line
p++;
new_addr = count_lines(text, dot);
}
# if ENABLE_FEATURE_VI_YANKMARK
else if (*p == '\'') { // is this a mark addr
@ -2368,7 +2373,7 @@ static char *get_one_address(char *p, int *addr) // get colon addr, if present
}
if (q == NULL) // is mark valid
return NULL;
*addr = count_lines(text, q);
new_addr = count_lines(text, q);
}
# endif
# if ENABLE_FEATURE_VI_SEARCH
@ -2393,16 +2398,37 @@ static char *get_one_address(char *p, int *addr) // get colon addr, if present
q = char_search(q, last_search_pattern + 1, dir);
if (q == NULL)
return NULL;
*addr = count_lines(text, q);
new_addr = count_lines(text, q);
}
# endif
else if (*p == '$') { // the last line in file
p++;
*addr = count_lines(text, end - 1);
} else if (isdigit(*p)) { // specific line number
sscanf(p, "%d%n", addr, &st);
new_addr = count_lines(text, end - 1);
} else if (isdigit(*p)) {
sscanf(p, "%d%n", &num, &st);
p += st;
if (addr < 0) { // specific line number
addr = num;
} else { // offset from current addr
addr += sign >= 0 ? num : -num;
}
sign = 0;
} else if (*p == '-' || *p == '+') {
sign = *p++ == '-' ? -1 : 1;
if (addr < 0) { // default address is dot
addr = count_lines(text, dot);
}
} else {
addr += sign; // consume unused trailing sign
break;
}
if (new_addr >= 0) {
if (addr >= 0) // only one new address per expression
return NULL;
addr = new_addr;
}
}
*result = addr;
return p;
}