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https://github.com/neovim/neovim.git
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Extract cursor.h from misc{1,2}.h and memline.h
This commit is contained in:
Hinidu
489
src/nvim/cursor.c
Normal file
489
src/nvim/cursor.c
Normal file
@@ -0,0 +1,489 @@
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#include "nvim/cursor.h"
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#include "nvim/charset.h"
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#include "nvim/fold.h"
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#include "nvim/memline.h"
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#include "nvim/memory.h"
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#include "nvim/misc1.h"
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#include "nvim/move.h"
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#include "nvim/screen.h"
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#include "nvim/vim.h"
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static int coladvance2(pos_T *pos, int addspaces, int finetune, colnr_T wcol);
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/*
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* Get the screen position of the cursor.
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*/
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int getviscol(void)
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{
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colnr_T x;
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getvvcol(curwin, &curwin->w_cursor, &x, NULL, NULL);
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return (int)x;
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}
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/*
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* Get the screen position of character col with a coladd in the cursor line.
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*/
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int getviscol2(colnr_T col, colnr_T coladd)
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{
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colnr_T x;
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pos_T pos;
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pos.lnum = curwin->w_cursor.lnum;
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pos.col = col;
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pos.coladd = coladd;
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getvvcol(curwin, &pos, &x, NULL, NULL);
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return (int)x;
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}
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/*
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* Go to column "wcol", and add/insert white space as necessary to get the
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* cursor in that column.
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* The caller must have saved the cursor line for undo!
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*/
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int coladvance_force(colnr_T wcol)
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{
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int rc = coladvance2(&curwin->w_cursor, TRUE, FALSE, wcol);
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if (wcol == MAXCOL)
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curwin->w_valid &= ~VALID_VIRTCOL;
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else {
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/* Virtcol is valid */
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curwin->w_valid |= VALID_VIRTCOL;
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curwin->w_virtcol = wcol;
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}
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return rc;
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}
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/*
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* Try to advance the Cursor to the specified screen column.
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* If virtual editing: fine tune the cursor position.
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* Note that all virtual positions off the end of a line should share
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* a curwin->w_cursor.col value (n.b. this is equal to STRLEN(line)),
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* beginning at coladd 0.
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*
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* return OK if desired column is reached, FAIL if not
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*/
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int coladvance(colnr_T wcol)
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{
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int rc = getvpos(&curwin->w_cursor, wcol);
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if (wcol == MAXCOL || rc == FAIL)
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curwin->w_valid &= ~VALID_VIRTCOL;
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else if (*ml_get_cursor() != TAB) {
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/* Virtcol is valid when not on a TAB */
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curwin->w_valid |= VALID_VIRTCOL;
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curwin->w_virtcol = wcol;
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}
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return rc;
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}
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static int
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coladvance2 (
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pos_T *pos,
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int addspaces, /* change the text to achieve our goal? */
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int finetune, /* change char offset for the exact column */
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colnr_T wcol /* column to move to */
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)
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{
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int idx;
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char_u *ptr;
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char_u *line;
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colnr_T col = 0;
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int csize = 0;
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int one_more;
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int head = 0;
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one_more = (State & INSERT)
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|| restart_edit != NUL
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|| (VIsual_active && *p_sel != 'o')
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|| ((ve_flags & VE_ONEMORE) && wcol < MAXCOL)
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;
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line = ml_get_buf(curbuf, pos->lnum, FALSE);
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if (wcol >= MAXCOL) {
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idx = (int)STRLEN(line) - 1 + one_more;
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col = wcol;
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if ((addspaces || finetune) && !VIsual_active) {
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curwin->w_curswant = linetabsize(line) + one_more;
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if (curwin->w_curswant > 0)
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--curwin->w_curswant;
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}
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} else {
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int width = W_WIDTH(curwin) - win_col_off(curwin);
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if (finetune
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&& curwin->w_p_wrap
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&& curwin->w_width != 0
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&& wcol >= (colnr_T)width) {
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csize = linetabsize(line);
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if (csize > 0)
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csize--;
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if (wcol / width > (colnr_T)csize / width
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&& ((State & INSERT) == 0 || (int)wcol > csize + 1)) {
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/* In case of line wrapping don't move the cursor beyond the
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* right screen edge. In Insert mode allow going just beyond
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* the last character (like what happens when typing and
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* reaching the right window edge). */
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wcol = (csize / width + 1) * width - 1;
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}
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}
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ptr = line;
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while (col <= wcol && *ptr != NUL) {
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/* Count a tab for what it's worth (if list mode not on) */
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csize = win_lbr_chartabsize(curwin, ptr, col, &head);
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mb_ptr_adv(ptr);
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col += csize;
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}
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idx = (int)(ptr - line);
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/*
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* Handle all the special cases. The virtual_active() check
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* is needed to ensure that a virtual position off the end of
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* a line has the correct indexing. The one_more comparison
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* replaces an explicit add of one_more later on.
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*/
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if (col > wcol || (!virtual_active() && one_more == 0)) {
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idx -= 1;
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/* Don't count the chars from 'showbreak'. */
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csize -= head;
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col -= csize;
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}
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if (virtual_active()
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&& addspaces
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&& ((col != wcol && col != wcol + 1) || csize > 1)) {
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/* 'virtualedit' is set: The difference between wcol and col is
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* filled with spaces. */
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if (line[idx] == NUL) {
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/* Append spaces */
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int correct = wcol - col;
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char_u *newline = xmalloc(idx + correct + 1);
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int t;
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for (t = 0; t < idx; ++t)
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newline[t] = line[t];
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for (t = 0; t < correct; ++t)
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newline[t + idx] = ' ';
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newline[idx + correct] = NUL;
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ml_replace(pos->lnum, newline, FALSE);
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changed_bytes(pos->lnum, (colnr_T)idx);
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idx += correct;
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col = wcol;
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} else {
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/* Break a tab */
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int linelen = (int)STRLEN(line);
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int correct = wcol - col - csize + 1; /* negative!! */
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char_u *newline;
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int t, s = 0;
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int v;
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if (-correct > csize)
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return FAIL;
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newline = xmalloc(linelen + csize);
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for (t = 0; t < linelen; t++) {
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if (t != idx)
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newline[s++] = line[t];
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else
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for (v = 0; v < csize; v++)
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newline[s++] = ' ';
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}
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newline[linelen + csize - 1] = NUL;
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ml_replace(pos->lnum, newline, FALSE);
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changed_bytes(pos->lnum, idx);
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idx += (csize - 1 + correct);
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col += correct;
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}
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}
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}
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if (idx < 0)
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pos->col = 0;
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else
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pos->col = idx;
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pos->coladd = 0;
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if (finetune) {
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if (wcol == MAXCOL) {
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/* The width of the last character is used to set coladd. */
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if (!one_more) {
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colnr_T scol, ecol;
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getvcol(curwin, pos, &scol, NULL, &ecol);
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pos->coladd = ecol - scol;
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}
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} else {
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int b = (int)wcol - (int)col;
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/* The difference between wcol and col is used to set coladd. */
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if (b > 0 && b < (MAXCOL - 2 * W_WIDTH(curwin)))
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pos->coladd = b;
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col += b;
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}
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}
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/* prevent from moving onto a trail byte */
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if (has_mbyte)
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mb_adjustpos(curbuf, pos);
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if (col < wcol)
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return FAIL;
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return OK;
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}
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/*
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* Return in "pos" the position of the cursor advanced to screen column "wcol".
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* return OK if desired column is reached, FAIL if not
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*/
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int getvpos(pos_T *pos, colnr_T wcol)
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{
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return coladvance2(pos, FALSE, virtual_active(), wcol);
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}
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/*
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* Increment the cursor position. See inc() for return values.
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*/
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int inc_cursor(void)
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{
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return inc(&curwin->w_cursor);
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}
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/*
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* dec(p)
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*
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* Decrement the line pointer 'p' crossing line boundaries as necessary.
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* Return 1 when crossing a line, -1 when at start of file, 0 otherwise.
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*/
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int dec_cursor(void)
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{
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return dec(&curwin->w_cursor);
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}
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/*
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* Get the line number relative to the current cursor position, i.e. the
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* difference between line number and cursor position. Only look for lines that
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* can be visible, folded lines don't count.
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*/
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linenr_T
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get_cursor_rel_lnum (
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win_T *wp,
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linenr_T lnum /* line number to get the result for */
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)
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{
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linenr_T cursor = wp->w_cursor.lnum;
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linenr_T retval = 0;
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if (hasAnyFolding(wp)) {
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if (lnum > cursor) {
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while (lnum > cursor) {
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(void)hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL);
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/* if lnum and cursor are in the same fold,
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* now lnum <= cursor */
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if (lnum > cursor)
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retval++;
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lnum--;
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}
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} else if (lnum < cursor) {
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while (lnum < cursor) {
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(void)hasFoldingWin(wp, lnum, NULL, &lnum, TRUE, NULL);
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/* if lnum and cursor are in the same fold,
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* now lnum >= cursor */
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if (lnum < cursor)
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retval--;
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lnum++;
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}
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}
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/* else if (lnum == cursor)
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* retval = 0;
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*/
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} else
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retval = lnum - cursor;
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return retval;
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}
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/*
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* Make sure curwin->w_cursor.lnum is valid.
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*/
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void check_cursor_lnum(void)
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{
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if (curwin->w_cursor.lnum > curbuf->b_ml.ml_line_count) {
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/* If there is a closed fold at the end of the file, put the cursor in
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* its first line. Otherwise in the last line. */
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if (!hasFolding(curbuf->b_ml.ml_line_count,
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&curwin->w_cursor.lnum, NULL))
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curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count;
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}
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if (curwin->w_cursor.lnum <= 0)
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curwin->w_cursor.lnum = 1;
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}
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/*
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* Make sure curwin->w_cursor.col is valid.
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*/
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void check_cursor_col(void)
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{
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check_cursor_col_win(curwin);
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}
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/*
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* Make sure win->w_cursor.col is valid.
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*/
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void check_cursor_col_win(win_T *win)
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{
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colnr_T len;
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colnr_T oldcol = win->w_cursor.col;
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colnr_T oldcoladd = win->w_cursor.col + win->w_cursor.coladd;
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len = (colnr_T)STRLEN(ml_get_buf(win->w_buffer, win->w_cursor.lnum, FALSE));
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if (len == 0)
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win->w_cursor.col = 0;
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else if (win->w_cursor.col >= len) {
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/* Allow cursor past end-of-line when:
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* - in Insert mode or restarting Insert mode
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* - in Visual mode and 'selection' isn't "old"
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* - 'virtualedit' is set */
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if ((State & INSERT) || restart_edit
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|| (VIsual_active && *p_sel != 'o')
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|| (ve_flags & VE_ONEMORE)
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|| virtual_active())
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win->w_cursor.col = len;
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else {
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win->w_cursor.col = len - 1;
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/* Move the cursor to the head byte. */
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if (has_mbyte)
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mb_adjustpos(win->w_buffer, &win->w_cursor);
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}
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} else if (win->w_cursor.col < 0)
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win->w_cursor.col = 0;
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/* If virtual editing is on, we can leave the cursor on the old position,
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* only we must set it to virtual. But don't do it when at the end of the
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* line. */
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if (oldcol == MAXCOL)
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win->w_cursor.coladd = 0;
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else if (ve_flags == VE_ALL) {
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if (oldcoladd > win->w_cursor.col)
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win->w_cursor.coladd = oldcoladd - win->w_cursor.col;
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else
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/* avoid weird number when there is a miscalculation or overflow */
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win->w_cursor.coladd = 0;
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}
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}
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/*
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* make sure curwin->w_cursor in on a valid character
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*/
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void check_cursor(void)
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{
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check_cursor_lnum();
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check_cursor_col();
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}
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/*
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* Make sure curwin->w_cursor is not on the NUL at the end of the line.
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* Allow it when in Visual mode and 'selection' is not "old".
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*/
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void adjust_cursor_col(void)
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{
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if (curwin->w_cursor.col > 0
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&& (!VIsual_active || *p_sel == 'o')
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&& gchar_cursor() == NUL)
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--curwin->w_cursor.col;
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}
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/*
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* When curwin->w_leftcol has changed, adjust the cursor position.
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* Return TRUE if the cursor was moved.
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*/
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int leftcol_changed(void)
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{
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long lastcol;
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colnr_T s, e;
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int retval = FALSE;
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changed_cline_bef_curs();
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lastcol = curwin->w_leftcol + W_WIDTH(curwin) - curwin_col_off() - 1;
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validate_virtcol();
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/*
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* If the cursor is right or left of the screen, move it to last or first
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* character.
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*/
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if (curwin->w_virtcol > (colnr_T)(lastcol - p_siso)) {
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retval = TRUE;
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coladvance((colnr_T)(lastcol - p_siso));
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} else if (curwin->w_virtcol < curwin->w_leftcol + p_siso) {
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retval = TRUE;
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(void)coladvance((colnr_T)(curwin->w_leftcol + p_siso));
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}
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/*
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* If the start of the character under the cursor is not on the screen,
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* advance the cursor one more char. If this fails (last char of the
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* line) adjust the scrolling.
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*/
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getvvcol(curwin, &curwin->w_cursor, &s, NULL, &e);
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if (e > (colnr_T)lastcol) {
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retval = TRUE;
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coladvance(s - 1);
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} else if (s < curwin->w_leftcol) {
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retval = TRUE;
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if (coladvance(e + 1) == FAIL) { /* there isn't another character */
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curwin->w_leftcol = s; /* adjust w_leftcol instead */
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changed_cline_bef_curs();
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}
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}
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if (retval)
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curwin->w_set_curswant = TRUE;
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redraw_later(NOT_VALID);
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return retval;
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}
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int gchar_cursor(void)
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{
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if (has_mbyte)
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return (*mb_ptr2char)(ml_get_cursor());
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return (int)*ml_get_cursor();
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}
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/*
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* Write a character at the current cursor position.
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* It is directly written into the block.
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*/
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void pchar_cursor(int c)
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{
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*(ml_get_buf(curbuf, curwin->w_cursor.lnum, TRUE)
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+ curwin->w_cursor.col) = c;
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}
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/*
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* Return pointer to cursor line.
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*/
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char_u *ml_get_curline(void)
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{
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return ml_get_buf(curbuf, curwin->w_cursor.lnum, FALSE);
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}
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/*
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* Return pointer to cursor position.
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*/
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char_u *ml_get_cursor(void)
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{
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return ml_get_buf(curbuf, curwin->w_cursor.lnum, FALSE) +
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curwin->w_cursor.col;
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}
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