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neovim/src/nvim/indent.c

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "nvim/ascii.h"
#include "nvim/assert.h"
#include "nvim/buffer.h"
#include "nvim/change.h"
#include "nvim/charset.h"
#include "nvim/cursor.h"
#include "nvim/drawscreen.h"
#include "nvim/edit.h"
#include "nvim/eval.h"
#include "nvim/eval/typval_defs.h"
#include "nvim/ex_cmds_defs.h"
#include "nvim/ex_docmd.h"
#include "nvim/extmark.h"
#include "nvim/gettext.h"
#include "nvim/globals.h"
#include "nvim/indent.h"
#include "nvim/indent_c.h"
#include "nvim/mark.h"
#include "nvim/mbyte.h"
#include "nvim/memline.h"
#include "nvim/memory.h"
#include "nvim/message.h"
#include "nvim/move.h"
#include "nvim/option.h"
#include "nvim/option_vars.h"
#include "nvim/optionstr.h"
#include "nvim/os/input.h"
#include "nvim/plines.h"
#include "nvim/pos.h"
#include "nvim/regexp.h"
#include "nvim/search.h"
#include "nvim/strings.h"
#include "nvim/textformat.h"
#include "nvim/types.h"
#include "nvim/undo.h"
#include "nvim/vim.h"
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "indent.c.generated.h"
#endif
/// Set the integer values corresponding to the string setting of 'vartabstop'.
/// "array" will be set, caller must free it if needed.
///
/// @return false for an error.
bool tabstop_set(char *var, colnr_T **array)
{
int valcount = 1;
int t;
char *cp;
if (var[0] == NUL || (var[0] == '0' && var[1] == NUL)) {
*array = NULL;
return true;
}
for (cp = var; *cp != NUL; cp++) {
if (cp == var || cp[-1] == ',') {
char *end;
if (strtol(cp, &end, 10) <= 0) {
if (cp != end) {
emsg(_(e_positive));
} else {
semsg(_(e_invarg2), cp);
}
return false;
}
}
if (ascii_isdigit(*cp)) {
continue;
}
if (cp[0] == ',' && cp > var && cp[-1] != ',' && cp[1] != NUL) {
valcount++;
continue;
}
semsg(_(e_invarg2), var);
return false;
}
*array = (colnr_T *)xmalloc((unsigned)(valcount + 1) * sizeof(int));
(*array)[0] = (colnr_T)valcount;
t = 1;
for (cp = var; *cp != NUL;) {
int n = atoi(cp);
// Catch negative values, overflow and ridiculous big values.
if (n <= 0 || n > TABSTOP_MAX) {
semsg(_(e_invarg2), cp);
XFREE_CLEAR(*array);
return false;
}
(*array)[t++] = n;
while (*cp != NUL && *cp != ',') {
cp++;
}
if (*cp != NUL) {
cp++;
}
}
return true;
}
/// Calculate the number of screen spaces a tab will occupy.
/// If "vts" is set then the tab widths are taken from that array,
/// otherwise the value of ts is used.
int tabstop_padding(colnr_T col, OptInt ts_arg, const colnr_T *vts)
{
OptInt ts = ts_arg == 0 ? 8 : ts_arg;
colnr_T tabcol = 0;
int t;
int padding = 0;
if (vts == NULL || vts[0] == 0) {
return (int)(ts - (col % ts));
}
const int tabcount = vts[0];
for (t = 1; t <= tabcount; t++) {
tabcol += vts[t];
if (tabcol > col) {
padding = tabcol - col;
break;
}
}
if (t > tabcount) {
padding = vts[tabcount] - ((col - tabcol) % vts[tabcount]);
}
return padding;
}
/// Find the size of the tab that covers a particular column.
int tabstop_at(colnr_T col, OptInt ts, const colnr_T *vts)
{
colnr_T tabcol = 0;
int t;
int tab_size = 0;
if (vts == NULL || vts[0] == 0) {
return (int)ts;
}
const int tabcount = vts[0];
for (t = 1; t <= tabcount; t++) {
tabcol += vts[t];
if (tabcol > col) {
tab_size = vts[t];
break;
}
}
if (t > tabcount) {
tab_size = vts[tabcount];
}
return tab_size;
}
/// Find the column on which a tab starts.
colnr_T tabstop_start(colnr_T col, int ts, colnr_T *vts)
{
colnr_T tabcol = 0;
int t;
if (vts == NULL || vts[0] == 0) {
return ((col / ts) * ts);
}
const int tabcount = vts[0];
for (t = 1; t <= tabcount; t++) {
tabcol += vts[t];
if (tabcol > col) {
return (tabcol - vts[t]);
}
}
const int excess = (tabcol % vts[tabcount]);
return (excess + ((col - excess) / vts[tabcount]) * vts[tabcount]);
}
/// Find the number of tabs and spaces necessary to get from one column
/// to another.
void tabstop_fromto(colnr_T start_col, colnr_T end_col, int ts_arg, const colnr_T *vts, int *ntabs,
int *nspcs)
{
int spaces = end_col - start_col;
colnr_T tabcol = 0;
int padding = 0;
int t;
int ts = ts_arg == 0 ? (int)curbuf->b_p_ts : ts_arg;
assert(ts != 0); // suppress clang "Division by zero"
if (vts == NULL || vts[0] == 0) {
int tabs = 0;
const int initspc = (ts - (start_col % ts));
if (spaces >= initspc) {
spaces -= initspc;
tabs++;
}
tabs += (spaces / ts);
spaces -= ((spaces / ts) * ts);
*ntabs = tabs;
*nspcs = spaces;
return;
}
// Find the padding needed to reach the next tabstop.
const int tabcount = vts[0];
for (t = 1; t <= tabcount; t++) {
tabcol += vts[t];
if (tabcol > start_col) {
padding = tabcol - start_col;
break;
}
}
if (t > tabcount) {
padding = vts[tabcount] - ((start_col - tabcol) % vts[tabcount]);
}
// If the space needed is less than the padding no tabs can be used.
if (spaces < padding) {
*ntabs = 0;
*nspcs = spaces;
return;
}
*ntabs = 1;
spaces -= padding;
// At least one tab has been used. See if any more will fit.
while (spaces != 0 && ++t <= tabcount) {
padding = vts[t];
if (spaces < padding) {
*nspcs = spaces;
return;
}
*ntabs += 1;
spaces -= padding;
}
*ntabs += spaces / (int)vts[tabcount];
*nspcs = spaces % (int)vts[tabcount];
}
/// See if two tabstop arrays contain the same values.
bool tabstop_eq(const colnr_T *ts1, const colnr_T *ts2)
{
int t;
if ((ts1 == 0 && ts2) || (ts1 && ts2 == 0)) {
return false;
}
if (ts1 == ts2) {
return true;
}
if (ts1[0] != ts2[0]) {
return false;
}
for (t = 1; t <= ts1[0]; t++) {
if (ts1[t] != ts2[t]) {
return false;
}
}
return true;
}
/// Copy a tabstop array, allocating space for the new array.
int *tabstop_copy(const int *oldts)
{
int *newts;
int t;
if (oldts == 0) {
return 0;
}
newts = xmalloc((unsigned)(oldts[0] + 1) * sizeof(int));
for (t = 0; t <= oldts[0]; t++) {
newts[t] = oldts[t];
}
return newts;
}
/// Return a count of the number of tabstops.
int tabstop_count(colnr_T *ts)
{
return ts != NULL ? (int)ts[0] : 0;
}
/// Return the first tabstop, or 8 if there are no tabstops defined.
int tabstop_first(colnr_T *ts)
{
return ts != NULL ? (int)ts[1] : 8;
}
/// Return the effective shiftwidth value for current buffer, using the
/// 'tabstop' value when 'shiftwidth' is zero.
int get_sw_value(buf_T *buf)
{
int result = get_sw_value_col(buf, 0);
return result;
}
/// Idem, using "pos".
int get_sw_value_pos(buf_T *buf, pos_T *pos)
{
pos_T save_cursor = curwin->w_cursor;
curwin->w_cursor = *pos;
int sw_value = get_sw_value_col(buf, get_nolist_virtcol());
curwin->w_cursor = save_cursor;
return sw_value;
}
/// Idem, using the first non-black in the current line.
int get_sw_value_indent(buf_T *buf)
{
pos_T pos = curwin->w_cursor;
pos.col = (colnr_T)getwhitecols_curline();
return get_sw_value_pos(buf, &pos);
}
/// Idem, using virtual column "col".
int get_sw_value_col(buf_T *buf, colnr_T col)
{
return buf->b_p_sw ? (int)buf->b_p_sw
: tabstop_at(col, buf->b_p_ts, buf->b_p_vts_array);
}
/// Return the effective softtabstop value for the current buffer,
/// using the shiftwidth value when 'softtabstop' is negative.
int get_sts_value(void)
{
int result = curbuf->b_p_sts < 0 ? get_sw_value(curbuf) : (int)curbuf->b_p_sts;
return result;
}
// Count the size (in window cells) of the indent in the current line.
int get_indent(void)
{
return get_indent_str_vtab(get_cursor_line_ptr(),
curbuf->b_p_ts,
curbuf->b_p_vts_array,
false);
}
// Count the size (in window cells) of the indent in line "lnum".
int get_indent_lnum(linenr_T lnum)
{
return get_indent_str_vtab(ml_get(lnum),
curbuf->b_p_ts,
curbuf->b_p_vts_array,
false);
}
// Count the size (in window cells) of the indent in line "lnum" of buffer
// "buf".
int get_indent_buf(buf_T *buf, linenr_T lnum)
{
return get_indent_str_vtab(ml_get_buf(buf, lnum), buf->b_p_ts, buf->b_p_vts_array, false);
}
/// Count the size (in window cells) of the indent in line "ptr", with
/// 'tabstop' at "ts".
/// If @param list is true, count only screen size for tabs.
int get_indent_str(const char *ptr, int ts, bool list)
FUNC_ATTR_NONNULL_ALL
{
int count = 0;
for (; *ptr; ptr++) {
// Count a tab for what it is worth.
if (*ptr == TAB) {
if (!list || curwin->w_p_lcs_chars.tab1) {
// count a tab for what it is worth
count += ts - (count % ts);
} else {
// In list mode, when tab is not set, count screen char width
// for Tab, displays: ^I
count += ptr2cells(ptr);
}
} else if (*ptr == ' ') {
// Count a space for one.
count++;
} else {
break;
}
}
return count;
}
/// Count the size (in window cells) of the indent in line "ptr", using
/// variable tabstops.
/// if "list" is true, count only screen size for tabs.
int get_indent_str_vtab(const char *ptr, OptInt ts, colnr_T *vts, bool list)
{
int count = 0;
for (; *ptr; ptr++) {
if (*ptr == TAB) { // count a tab for what it is worth
if (!list || curwin->w_p_lcs_chars.tab1) {
count += tabstop_padding(count, ts, vts);
} else {
// In list mode, when tab is not set, count screen char width
// for Tab, displays: ^I
count += ptr2cells(ptr);
}
} else if (*ptr == ' ') {
count++; // count a space for one
} else {
break;
}
}
return count;
}
// Set the indent of the current line.
// Leaves the cursor on the first non-blank in the line.
// Caller must take care of undo.
// "flags":
// SIN_CHANGED: call changed_bytes() if the line was changed.
// SIN_INSERT: insert the indent in front of the line.
// SIN_UNDO: save line for undo before changing it.
// SIN_NOMARK: don't move extmarks (because just after ml_append or something)
// @param size measured in spaces
// Returns true if the line was changed.
int set_indent(int size, int flags)
{
char *p;
char *newline;
char *oldline;
char *s;
int todo;
int ind_len; // Measured in characters.
int line_len;
int doit = false;
int ind_done = 0; // Measured in spaces.
int tab_pad;
int retval = false;
// Number of initial whitespace chars when 'et' and 'pi' are both set.
int orig_char_len = -1;
// First check if there is anything to do and compute the number of
// characters needed for the indent.
todo = size;
ind_len = 0;
p = oldline = get_cursor_line_ptr();
// Calculate the buffer size for the new indent, and check to see if it
// isn't already set.
// If 'expandtab' isn't set: use TABs; if both 'expandtab' and
// 'preserveindent' are set count the number of characters at the
// beginning of the line to be copied.
if (!curbuf->b_p_et || (!(flags & SIN_INSERT) && curbuf->b_p_pi)) {
int ind_col = 0;
// If 'preserveindent' is set then reuse as much as possible of
// the existing indent structure for the new indent.
if (!(flags & SIN_INSERT) && curbuf->b_p_pi) {
ind_done = 0;
// Count as many characters as we can use.
while (todo > 0 && ascii_iswhite(*p)) {
if (*p == TAB) {
tab_pad = tabstop_padding(ind_done,
curbuf->b_p_ts,
curbuf->b_p_vts_array);
// Stop if this tab will overshoot the target.
if (todo < tab_pad) {
break;
}
todo -= tab_pad;
ind_len++;
ind_done += tab_pad;
} else {
todo--;
ind_len++;
ind_done++;
}
p++;
}
// These diverge from this point.
ind_col = ind_done;
// Set initial number of whitespace chars to copy if we are
// preserving indent but expandtab is set.
if (curbuf->b_p_et) {
orig_char_len = ind_len;
}
// Fill to next tabstop with a tab, if possible.
tab_pad = tabstop_padding(ind_done,
curbuf->b_p_ts,
curbuf->b_p_vts_array);
if ((todo >= tab_pad) && (orig_char_len == -1)) {
doit = true;
todo -= tab_pad;
ind_len++;
// ind_done += tab_pad;
ind_col += tab_pad;
}
}
// Count tabs required for indent.
while (true) {
tab_pad = tabstop_padding(ind_col, curbuf->b_p_ts, curbuf->b_p_vts_array);
if (todo < tab_pad) {
break;
}
if (*p != TAB) {
doit = true;
} else {
p++;
}
todo -= tab_pad;
ind_len++;
ind_col += tab_pad;
}
}
// Count spaces required for indent.
while (todo > 0) {
if (*p != ' ') {
doit = true;
} else {
p++;
}
todo--;
ind_len++;
// ind_done++;
}
// Return if the indent is OK already.
if (!doit && !ascii_iswhite(*p) && !(flags & SIN_INSERT)) {
return false;
}
// Allocate memory for the new line.
if (flags & SIN_INSERT) {
p = oldline;
} else {
p = skipwhite(p);
}
line_len = (int)strlen(p) + 1;
// If 'preserveindent' and 'expandtab' are both set keep the original
// characters and allocate accordingly. We will fill the rest with spaces
// after the if (!curbuf->b_p_et) below.
int skipcols = 0; // number of columns (in bytes) that were presved
if (orig_char_len != -1) {
int newline_size; // = orig_char_len + size - ind_done + line_len
STRICT_ADD(orig_char_len, size, &newline_size, int);
STRICT_SUB(newline_size, ind_done, &newline_size, int);
STRICT_ADD(newline_size, line_len, &newline_size, int);
assert(newline_size >= 0);
newline = xmalloc((size_t)newline_size);
todo = size - ind_done;
// Set total length of indent in characters, which may have been
// undercounted until now.
ind_len = orig_char_len + todo;
p = oldline;
s = newline;
skipcols = orig_char_len;
while (orig_char_len > 0) {
*s++ = *p++;
orig_char_len--;
}
// Skip over any additional white space (useful when newindent is less
// than old).
while (ascii_iswhite(*p)) {
p++;
}
} else {
todo = size;
assert(ind_len + line_len >= 0);
size_t newline_size;
STRICT_ADD(ind_len, line_len, &newline_size, size_t);
newline = xmalloc(newline_size);
s = newline;
}
// Put the characters in the new line.
// if 'expandtab' isn't set: use TABs
if (!curbuf->b_p_et) {
// If 'preserveindent' is set then reuse as much as possible of
// the existing indent structure for the new indent.
if (!(flags & SIN_INSERT) && curbuf->b_p_pi) {
p = oldline;
ind_done = 0;
while (todo > 0 && ascii_iswhite(*p)) {
if (*p == TAB) {
tab_pad = tabstop_padding(ind_done,
curbuf->b_p_ts,
curbuf->b_p_vts_array);
// Stop if this tab will overshoot the target.
if (todo < tab_pad) {
break;
}
todo -= tab_pad;
ind_done += tab_pad;
} else {
todo--;
ind_done++;
}
*s++ = *p++;
skipcols++;
}
// Fill to next tabstop with a tab, if possible.
tab_pad = tabstop_padding(ind_done,
curbuf->b_p_ts,
curbuf->b_p_vts_array);
if (todo >= tab_pad) {
*s++ = TAB;
todo -= tab_pad;
ind_done += tab_pad;
}
p = skipwhite(p);
}
while (true) {
tab_pad = tabstop_padding(ind_done,
curbuf->b_p_ts,
curbuf->b_p_vts_array);
if (todo < tab_pad) {
break;
}
*s++ = TAB;
todo -= tab_pad;
ind_done += tab_pad;
}
}
while (todo > 0) {
*s++ = ' ';
todo--;
}
memmove(s, p, (size_t)line_len);
// Replace the line (unless undo fails).
if (!(flags & SIN_UNDO) || (u_savesub(curwin->w_cursor.lnum) == OK)) {
const colnr_T old_offset = (colnr_T)(p - oldline);
const colnr_T new_offset = (colnr_T)(s - newline);
// this may free "newline"
ml_replace(curwin->w_cursor.lnum, newline, false);
if (!(flags & SIN_NOMARK)) {
extmark_splice_cols(curbuf,
(int)curwin->w_cursor.lnum - 1,
skipcols,
old_offset - skipcols,
new_offset - skipcols,
kExtmarkUndo);
}
if (flags & SIN_CHANGED) {
changed_bytes(curwin->w_cursor.lnum, 0);
}
// Correct saved cursor position if it is in this line.
if (saved_cursor.lnum == curwin->w_cursor.lnum) {
if (saved_cursor.col >= old_offset) {
// Cursor was after the indent, adjust for the number of
// bytes added/removed.
saved_cursor.col += ind_len - old_offset;
} else if (saved_cursor.col >= new_offset) {
// Cursor was in the indent, and is now after it, put it back
// at the start of the indent (replacing spaces with TAB).
saved_cursor.col = new_offset;
}
}
retval = true;
} else {
xfree(newline);
}
curwin->w_cursor.col = ind_len;
return retval;
}
// Return the indent of the current line after a number. Return -1 if no
// number was found. Used for 'n' in 'formatoptions': numbered list.
// Since a pattern is used it can actually handle more than numbers.
int get_number_indent(linenr_T lnum)
{
colnr_T col;
pos_T pos;
regmatch_T regmatch;
int lead_len = 0; // Length of comment leader.
if (lnum > curbuf->b_ml.ml_line_count) {
return -1;
}
pos.lnum = 0;
// In format_lines() (i.e. not insert mode), fo+=q is needed too...
if ((State & MODE_INSERT) || has_format_option(FO_Q_COMS)) {
lead_len = get_leader_len(ml_get(lnum), NULL, false, true);
}
regmatch.regprog = vim_regcomp(curbuf->b_p_flp, RE_MAGIC);
if (regmatch.regprog != NULL) {
regmatch.rm_ic = false;
// vim_regexec() expects a pointer to a line. This lets us
// start matching for the flp beyond any comment leader...
if (vim_regexec(&regmatch, ml_get(lnum) + lead_len, (colnr_T)0)) {
pos.lnum = lnum;
pos.col = (colnr_T)(*regmatch.endp - ml_get(lnum));
pos.coladd = 0;
}
vim_regfree(regmatch.regprog);
}
if ((pos.lnum == 0) || (*ml_get_pos(&pos) == NUL)) {
return -1;
}
getvcol(curwin, &pos, &col, NULL, NULL);
return (int)col;
}
/// This is called when 'breakindentopt' is changed and when a window is
/// initialized
bool briopt_check(win_T *wp)
{
int bri_shift = 0;
int bri_min = 20;
bool bri_sbr = false;
int bri_list = 0;
int bri_vcol = 0;
char *p = wp->w_p_briopt;
while (*p != NUL) {
// Note: Keep this in sync with p_briopt_values
if (strncmp(p, "shift:", 6) == 0
&& ((p[6] == '-' && ascii_isdigit(p[7])) || ascii_isdigit(p[6]))) {
p += 6;
bri_shift = getdigits_int(&p, true, 0);
} else if (strncmp(p, "min:", 4) == 0 && ascii_isdigit(p[4])) {
p += 4;
bri_min = getdigits_int(&p, true, 0);
} else if (strncmp(p, "sbr", 3) == 0) {
p += 3;
bri_sbr = true;
} else if (strncmp(p, "list:", 5) == 0) {
p += 5;
bri_list = (int)getdigits(&p, false, 0);
} else if (strncmp(p, "column:", 7) == 0) {
p += 7;
bri_vcol = (int)getdigits(&p, false, 0);
}
if (*p != ',' && *p != NUL) {
return false;
}
if (*p == ',') {
p++;
}
}
wp->w_briopt_shift = bri_shift;
wp->w_briopt_min = bri_min;
wp->w_briopt_sbr = bri_sbr;
wp->w_briopt_list = bri_list;
wp->w_briopt_vcol = bri_vcol;
return true;
}
// Return appropriate space number for breakindent, taking influencing
// parameters into account. Window must be specified, since it is not
// necessarily always the current one.
int get_breakindent_win(win_T *wp, char *line)
FUNC_ATTR_NONNULL_ALL
{
static int prev_indent = 0; // cached indent value
static OptInt prev_ts = 0; // cached tabstop value
static int prev_fnum = 0; // cached buffer number
static char *prev_line = NULL; // cached copy of "line"
static varnumber_T prev_tick = 0; // changedtick of cached value
static colnr_T *prev_vts = NULL; // cached vartabs values
static int prev_list = 0; // cached list value
static int prev_listopt = 0; // cached w_p_briopt_list value
static char *prev_flp = NULL; // cached formatlistpat value
int bri = 0;
// window width minus window margin space, i.e. what rests for text
const int eff_wwidth = wp->w_width_inner -
((wp->w_p_nu || wp->w_p_rnu)
&& (vim_strchr(p_cpo, CPO_NUMCOL) == NULL) ? number_width(wp) + 1 : 0);
// used cached indent, unless
// - buffer changed
// - 'tabstop' changed
// - buffer was changed
// - 'briopt_list changed' changed or
// - 'formatlistpattern' changed
// - line changed
// - 'vartabs' changed
if (prev_fnum != wp->w_buffer->b_fnum
|| prev_ts != wp->w_buffer->b_p_ts
|| prev_tick != buf_get_changedtick(wp->w_buffer)
|| prev_listopt != wp->w_briopt_list
|| prev_flp == NULL
|| strcmp(prev_flp, get_flp_value(wp->w_buffer)) != 0
|| prev_line == NULL || strcmp(prev_line, line) != 0
|| prev_vts != wp->w_buffer->b_p_vts_array) {
prev_fnum = wp->w_buffer->b_fnum;
xfree(prev_line);
prev_line = xstrdup(line);
prev_ts = wp->w_buffer->b_p_ts;
prev_tick = buf_get_changedtick(wp->w_buffer);
prev_vts = wp->w_buffer->b_p_vts_array;
if (wp->w_briopt_vcol == 0) {
prev_indent = get_indent_str_vtab(line,
wp->w_buffer->b_p_ts,
wp->w_buffer->b_p_vts_array,
wp->w_p_list);
}
prev_listopt = wp->w_briopt_list;
prev_list = 0;
xfree(prev_flp);
prev_flp = xstrdup(get_flp_value(wp->w_buffer));
// add additional indent for numbered lists
if (wp->w_briopt_list != 0 && wp->w_briopt_vcol == 0) {
regmatch_T regmatch = {
.regprog = vim_regcomp(prev_flp, RE_MAGIC + RE_STRING + RE_AUTO + RE_STRICT),
};
if (regmatch.regprog != NULL) {
regmatch.rm_ic = false;
if (vim_regexec(&regmatch, line, 0)) {
if (wp->w_briopt_list > 0) {
prev_list += wp->w_briopt_list;
} else {
prev_indent = (int)(*regmatch.endp - *regmatch.startp);
}
}
vim_regfree(regmatch.regprog);
}
}
}
if (wp->w_briopt_vcol != 0) {
// column value has priority
bri = wp->w_briopt_vcol;
prev_list = 0;
} else {
bri = prev_indent + wp->w_briopt_shift;
}
// Add offset for number column, if 'n' is in 'cpoptions'
bri += win_col_off2(wp);
// add additional indent for numbered lists
if (wp->w_briopt_list > 0) {
bri += prev_list;
}
// indent minus the length of the showbreak string
if (wp->w_briopt_sbr) {
bri -= vim_strsize(get_showbreak_value(wp));
}
// never indent past left window margin
if (bri < 0) {
bri = 0;
} else if (bri > eff_wwidth - wp->w_briopt_min) {
// always leave at least bri_min characters on the left,
// if text width is sufficient
bri = (eff_wwidth - wp->w_briopt_min < 0)
? 0 : eff_wwidth - wp->w_briopt_min;
}
return bri;
}
// When extra == 0: Return true if the cursor is before or on the first
// non-blank in the line.
// When extra == 1: Return true if the cursor is before the first non-blank in
// the line.
int inindent(int extra)
{
char *ptr;
colnr_T col;
for (col = 0, ptr = get_cursor_line_ptr(); ascii_iswhite(*ptr); col++) {
ptr++;
}
if (col >= curwin->w_cursor.col + extra) {
return true;
}
return false;
}
/// @return true if the conditions are OK for smart indenting.
bool may_do_si(void)
{
return curbuf->b_p_si && !curbuf->b_p_cin && *curbuf->b_p_inde == NUL && !p_paste;
}
/// Give a "resulting text too long" error and maybe set got_int.
static void emsg_text_too_long(void)
{
emsg(_(e_resulting_text_too_long));
// when not inside a try/catch set got_int to break out of any loop
if (trylevel == 0) {
got_int = true;
}
}
/// ":retab".
void ex_retab(exarg_T *eap)
{
linenr_T lnum;
bool got_tab = false;
int num_spaces = 0;
int num_tabs;
int len;
int start_col = 0; // For start of white-space string
int64_t start_vcol = 0; // For start of white-space string
int old_len;
char *new_line = (char *)1; // init to non-NULL
colnr_T *new_vts_array = NULL;
char *new_ts_str; // string value of tab argument
int save_list;
linenr_T first_line = 0; // first changed line
linenr_T last_line = 0; // last changed line
save_list = curwin->w_p_list;
curwin->w_p_list = 0; // don't want list mode here
new_ts_str = eap->arg;
if (!tabstop_set(eap->arg, &new_vts_array)) {
return;
}
while (ascii_isdigit(*(eap->arg)) || *(eap->arg) == ',') {
(eap->arg)++;
}
// This ensures that either new_vts_array and new_ts_str are freshly
// allocated, or new_vts_array points to an existing array and new_ts_str
// is null.
if (new_vts_array == NULL) {
new_vts_array = curbuf->b_p_vts_array;
new_ts_str = NULL;
} else {
new_ts_str = xstrnsave(new_ts_str, (size_t)(eap->arg - new_ts_str));
}
for (lnum = eap->line1; !got_int && lnum <= eap->line2; lnum++) {
char *ptr = ml_get(lnum);
int col = 0;
int64_t vcol = 0;
bool did_undo = false; // called u_save for current line
while (true) {
if (ascii_iswhite(ptr[col])) {
if (!got_tab && num_spaces == 0) {
// First consecutive white-space
start_vcol = vcol;
start_col = col;
}
if (ptr[col] == ' ') {
num_spaces++;
} else {
got_tab = true;
}
} else {
if (got_tab || (eap->forceit && num_spaces > 1)) {
// Retabulate this string of white-space
// len is virtual length of white string
len = num_spaces = (int)(vcol - start_vcol);
num_tabs = 0;
if (!curbuf->b_p_et) {
int t, s;
tabstop_fromto((colnr_T)start_vcol, (colnr_T)vcol,
(int)curbuf->b_p_ts, new_vts_array, &t, &s);
num_tabs = t;
num_spaces = s;
}
if (curbuf->b_p_et || got_tab
|| (num_spaces + num_tabs < len)) {
if (did_undo == false) {
did_undo = true;
if (u_save((linenr_T)(lnum - 1),
(linenr_T)(lnum + 1)) == FAIL) {
new_line = NULL; // flag out-of-memory
break;
}
}
// len is actual number of white characters used
len = num_spaces + num_tabs;
old_len = (int)strlen(ptr);
const int new_len = old_len - col + start_col + len + 1;
if (new_len <= 0 || new_len >= MAXCOL) {
emsg_text_too_long();
break;
}
new_line = xmalloc((size_t)new_len);
if (start_col > 0) {
memmove(new_line, ptr, (size_t)start_col);
}
memmove(new_line + start_col + len,
ptr + col, (size_t)old_len - (size_t)col + 1);
ptr = new_line + start_col;
for (col = 0; col < len; col++) {
ptr[col] = (col < num_tabs) ? '\t' : ' ';
}
if (ml_replace(lnum, new_line, false) == OK) {
// "new_line" may have been copied
new_line = curbuf->b_ml.ml_line_ptr;
extmark_splice_cols(curbuf, lnum - 1, 0, (colnr_T)old_len,
(colnr_T)new_len - 1, kExtmarkUndo);
}
if (first_line == 0) {
first_line = lnum;
}
last_line = lnum;
ptr = new_line;
col = start_col + len;
}
}
got_tab = false;
num_spaces = 0;
}
if (ptr[col] == NUL) {
break;
}
vcol += win_chartabsize(curwin, ptr + col, (colnr_T)vcol);
if (vcol >= MAXCOL) {
emsg_text_too_long();
break;
}
col += utfc_ptr2len(ptr + col);
}
if (new_line == NULL) { // out of memory
break;
}
line_breakcheck();
}
if (got_int) {
emsg(_(e_interr));
}
// If a single value was given then it can be considered equal to
// either the value of 'tabstop' or the value of 'vartabstop'.
if (tabstop_count(curbuf->b_p_vts_array) == 0
&& tabstop_count(new_vts_array) == 1
&& curbuf->b_p_ts == tabstop_first(new_vts_array)) {
// not changed
} else if (tabstop_count(curbuf->b_p_vts_array) > 0
&& tabstop_eq(curbuf->b_p_vts_array, new_vts_array)) {
// not changed
} else {
redraw_curbuf_later(UPD_NOT_VALID);
}
if (first_line != 0) {
changed_lines(curbuf, first_line, 0, last_line + 1, 0, true);
}
curwin->w_p_list = save_list; // restore 'list'
if (new_ts_str != NULL) { // set the new tabstop
// If 'vartabstop' is in use or if the value given to retab has more
// than one tabstop then update 'vartabstop'.
colnr_T *old_vts_ary = curbuf->b_p_vts_array;
if (tabstop_count(old_vts_ary) > 0 || tabstop_count(new_vts_array) > 1) {
set_string_option_direct("vts", -1, new_ts_str, OPT_FREE | OPT_LOCAL, 0);
curbuf->b_p_vts_array = new_vts_array;
xfree(old_vts_ary);
} else {
// 'vartabstop' wasn't in use and a single value was given to
// retab then update 'tabstop'.
curbuf->b_p_ts = tabstop_first(new_vts_array);
xfree(new_vts_array);
}
xfree(new_ts_str);
}
coladvance(curwin->w_curswant);
u_clearline(curbuf);
}
/// Get indent level from 'indentexpr'.
int get_expr_indent(void)
{
int indent = -1;
pos_T save_pos;
colnr_T save_curswant;
int save_set_curswant;
int save_State;
int use_sandbox = was_set_insecurely(curwin, "indentexpr", OPT_LOCAL);
const sctx_T save_sctx = current_sctx;
// Save and restore cursor position and curswant, in case it was changed
// * via :normal commands.
save_pos = curwin->w_cursor;
save_curswant = curwin->w_curswant;
save_set_curswant = curwin->w_set_curswant;
set_vim_var_nr(VV_LNUM, (varnumber_T)curwin->w_cursor.lnum);
if (use_sandbox) {
sandbox++;
}
textlock++;
current_sctx = curbuf->b_p_script_ctx[BV_INDE].script_ctx;
// Need to make a copy, the 'indentexpr' option could be changed while
// evaluating it.
char *inde_copy = xstrdup(curbuf->b_p_inde);
indent = (int)eval_to_number(inde_copy);
xfree(inde_copy);
if (use_sandbox) {
sandbox--;
}
textlock--;
current_sctx = save_sctx;
// Restore the cursor position so that 'indentexpr' doesn't need to.
// Pretend to be in Insert mode, allow cursor past end of line for "o"
// command.
save_State = State;
State = MODE_INSERT;
curwin->w_cursor = save_pos;
curwin->w_curswant = save_curswant;
curwin->w_set_curswant = save_set_curswant;
check_cursor();
State = save_State;
// Reset did_throw, unless 'debug' has "throw" and inside a try/catch.
if (did_throw && (vim_strchr(p_debug, 't') == NULL || trylevel == 0)) {
handle_did_throw();
did_throw = false;
}
// If there is an error, just keep the current indent.
if (indent < 0) {
indent = get_indent();
}
return indent;
}
// When 'p' is present in 'cpoptions, a Vi compatible method is used.
// The incompatible newer method is quite a bit better at indenting
// code in lisp-like languages than the traditional one; it's still
// mostly heuristics however -- Dirk van Deun, dirk@rave.org
// TODO(unknown):
// Findmatch() should be adapted for lisp, also to make showmatch
// work correctly: now (v5.3) it seems all C/C++ oriented:
// - it does not recognize the #\( and #\) notations as character literals
// - it doesn't know about comments starting with a semicolon
// - it incorrectly interprets '(' as a character literal
// All this messes up get_lisp_indent in some rare cases.
// Update from Sergey Khorev:
// I tried to fix the first two issues.
int get_lisp_indent(void)
{
pos_T *pos, realpos, paren;
int amount;
char *that;
int vi_lisp;
// Set vi_lisp to use the vi-compatible method.
vi_lisp = (vim_strchr(p_cpo, CPO_LISP) != NULL);
realpos = curwin->w_cursor;
curwin->w_cursor.col = 0;
if ((pos = findmatch(NULL, '(')) == NULL) {
pos = findmatch(NULL, '[');
} else {
paren = *pos;
pos = findmatch(NULL, '[');
if ((pos == NULL) || lt(*pos, paren)) {
pos = &paren;
}
}
if (pos != NULL) {
// Extra trick: Take the indent of the first previous non-white
// line that is at the same () level.
amount = -1;
int parencount = 0;
while (--curwin->w_cursor.lnum >= pos->lnum) {
if (linewhite(curwin->w_cursor.lnum)) {
continue;
}
for (that = get_cursor_line_ptr(); *that != NUL; that++) {
if (*that == ';') {
while (*(that + 1) != NUL) {
that++;
}
continue;
}
if (*that == '\\') {
if (*(that + 1) != NUL) {
that++;
}
continue;
}
if ((*that == '"') && (*(that + 1) != NUL)) {
while (*++that && *that != '"') {
// Skipping escaped characters in the string
if (*that == '\\') {
if (*++that == NUL) {
break;
}
if (that[1] == NUL) {
that++;
break;
}
}
}
if (*that == NUL) {
break;
}
}
if ((*that == '(') || (*that == '[')) {
parencount++;
} else if ((*that == ')') || (*that == ']')) {
parencount--;
}
}
if (parencount == 0) {
amount = get_indent();
break;
}
}
if (amount == -1) {
curwin->w_cursor.lnum = pos->lnum;
curwin->w_cursor.col = pos->col;
colnr_T col = pos->col;
that = get_cursor_line_ptr();
if (vi_lisp && (get_indent() == 0)) {
amount = 2;
} else {
char *line = that;
chartabsize_T cts;
init_chartabsize_arg(&cts, curwin, pos->lnum, 0, line, line);
while (*cts.cts_ptr != NUL && col > 0) {
cts.cts_vcol += lbr_chartabsize_adv(&cts);
col--;
}
amount = cts.cts_vcol;
that = cts.cts_ptr;
clear_chartabsize_arg(&cts);
// Some keywords require "body" indenting rules (the
// non-standard-lisp ones are Scheme special forms):
// (let ((a 1)) instead (let ((a 1))
// (...)) of (...))
if (!vi_lisp && ((*that == '(') || (*that == '['))
&& lisp_match(that + 1)) {
amount += 2;
} else {
if (*that != NUL) {
that++;
amount++;
}
colnr_T firsttry = amount;
init_chartabsize_arg(&cts, curwin, (colnr_T)(that - line),
amount, line, that);
while (ascii_iswhite(*cts.cts_ptr)) {
cts.cts_vcol += lbr_chartabsize(&cts);
cts.cts_ptr++;
}
that = cts.cts_ptr;
amount = cts.cts_vcol;
clear_chartabsize_arg(&cts);
if (*that && (*that != ';')) {
// Not a comment line.
// Test *that != '(' to accommodate first let/do
// argument if it is more than one line.
if (!vi_lisp && (*that != '(') && (*that != '[')) {
firsttry++;
}
parencount = 0;
init_chartabsize_arg(&cts, curwin,
(colnr_T)(that - line), amount, line, that);
if (vi_lisp || ((*that != '"') && (*that != '\'')
&& (*that != '#')
&& (((uint8_t)(*that) < '0') || ((uint8_t)(*that) > '9')))) {
int quotecount = 0;
while (*cts.cts_ptr
&& (!ascii_iswhite(*cts.cts_ptr) || quotecount || parencount)
&& (!((*cts.cts_ptr == '(' || *cts.cts_ptr == '[')
&& !quotecount && !parencount && vi_lisp))) {
if (*cts.cts_ptr == '"') {
quotecount = !quotecount;
}
if (((*cts.cts_ptr == '(') || (*cts.cts_ptr == '[')) && !quotecount) {
parencount++;
}
if (((*cts.cts_ptr == ')') || (*cts.cts_ptr == ']')) && !quotecount) {
parencount--;
}
if ((*cts.cts_ptr == '\\') && (*(cts.cts_ptr + 1) != NUL)) {
cts.cts_vcol += lbr_chartabsize_adv(&cts);
}
cts.cts_vcol += lbr_chartabsize_adv(&cts);
}
}
while (ascii_iswhite(*cts.cts_ptr)) {
cts.cts_vcol += lbr_chartabsize(&cts);
cts.cts_ptr++;
}
that = cts.cts_ptr;
amount = cts.cts_vcol;
clear_chartabsize_arg(&cts);
if (!*that || (*that == ';')) {
amount = firsttry;
}
}
}
}
}
} else {
amount = 0; // No matching '(' or '[' found, use zero indent.
}
curwin->w_cursor = realpos;
return amount;
}
static int lisp_match(char *p)
{
char buf[LSIZE];
char *word = *curbuf->b_p_lw != NUL ? curbuf->b_p_lw : p_lispwords;
while (*word != NUL) {
(void)copy_option_part(&word, buf, LSIZE, ",");
int len = (int)strlen(buf);
if ((strncmp(buf, p, (size_t)len) == 0) && ascii_iswhite_or_nul(p[len])) {
return true;
}
}
return false;
}
/// Re-indent the current line, based on the current contents of it and the
/// surrounding lines. Fixing the cursor position seems really easy -- I'm very
/// confused what all the part that handles Control-T is doing that I'm not.
/// "get_the_indent" should be get_c_indent, get_expr_indent or get_lisp_indent.
void fixthisline(IndentGetter get_the_indent)
{
int amount = get_the_indent();
if (amount < 0) {
return;
}
change_indent(INDENT_SET, amount, false, 0, true);
if (linewhite(curwin->w_cursor.lnum)) {
did_ai = true; // delete the indent if the line stays empty
}
}
/// Return true if 'indentexpr' should be used for Lisp indenting.
/// Caller may want to check 'autoindent'.
bool use_indentexpr_for_lisp(void)
{
return curbuf->b_p_lisp
&& *curbuf->b_p_inde != NUL
&& strcmp(curbuf->b_p_lop, "expr:1") == 0;
}
/// Fix indent for 'lisp' and 'cindent'.
void fix_indent(void)
{
if (p_paste) {
return; // no auto-indenting when 'paste' is set
}
if (curbuf->b_p_lisp && curbuf->b_p_ai) {
if (use_indentexpr_for_lisp()) {
do_c_expr_indent();
} else {
fixthisline(get_lisp_indent);
}
} else if (cindent_on()) {
do_c_expr_indent();
}
}
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