/*
* v_left -- [count]^H, [count]h
* Move left by columns.
*
* PUBLIC: int v_left __P((SCR *, VICMD *));
*/
int
v_left(SCR *sp, VICMD *vp)
{
db_recno_t cnt;
/*
* !!!
* The ^H and h commands always failed in the first column.
*/
if (vp->m_start.cno == 0) {
v_sol(sp);
return (1);
}
/* Find the end of the range. */
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
if (vp->m_start.cno > cnt)
vp->m_stop.cno = vp->m_start.cno - cnt;
else
vp->m_stop.cno = 0;
/*
* All commands move to the end of the range. Motion commands
* adjust the starting point to the character before the current
* one.
*/
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
return (0);
}
/*
* v_cfirst -- [count]_
* Move to the first non-blank character in a line.
*
* PUBLIC: int v_cfirst __P((SCR *, VICMD *));
*/
int
v_cfirst(SCR *sp, VICMD *vp)
{
db_recno_t cnt, lno;
/*
* !!!
* If the _ is a motion component, it makes the command a line motion
* e.g. "d_" deletes the line. It also means that the cursor doesn't
* move.
*
* The _ command never failed in the first column.
*/
if (ISMOTION(vp))
F_SET(vp, VM_LMODE);
/*
* !!!
* Historically a specified count makes _ move down count - 1
* rows, so, "3_" is the same as "2j_".
*/
cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
if (cnt != 1) {
--vp->count;
return (v_down(sp, vp));
}
/*
* Move to the first non-blank.
*
* Can't just use RCM_SET_FNB, in case _ is used as the motion
* component of another command.
*/
vp->m_stop.cno = 0;
if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
return (1);
/*
* !!!
* The _ command has to fail if the file is empty and we're doing
* a delete. If deleting line 1, and 0 is the first nonblank,
* make the check.
*/
if (vp->m_stop.lno == 1 &&
vp->m_stop.cno == 0 && ISCMD(vp->rkp, 'd')) {
if (db_last(sp, &lno))
return (1);
if (lno == 0) {
v_sol(sp);
return (1);
}
}
/*
* Delete and non-motion commands move to the end of the range,
* yank stays at the start. Ignore others.
*/
vp->m_final =
ISMOTION(vp) && ISCMD(vp->rkp, 'y') ? vp->m_start : vp->m_stop;
return (0);
}
/*
* v_ncol -- [count]|
* Move to column count or the first column on this line. If the
* requested column is past EOL, move to EOL. The nasty part is
* that we have to know character column widths to make this work.
*
* PUBLIC: int v_ncol __P((SCR *, VICMD *));
*/
int
v_ncol(SCR *sp, VICMD *vp)
{
if (F_ISSET(vp, VC_C1SET) && vp->count > 1) {
--vp->count;
vp->m_stop.cno =
vs_colpos(sp, vp->m_start.lno, (size_t)vp->count);
/*
* !!!
* The | command succeeded if used as a command and the cursor
* didn't move, but failed if used as a motion component in the
* same situation.
*/
if (ISMOTION(vp) && vp->m_stop.cno == vp->m_start.cno) {
v_nomove(sp);
return (1);
}
} else {
/*
* !!!
* The | command succeeded if used as a command in column 0
* without a count, but failed if used as a motion component
* in the same situation.
*/
if (ISMOTION(vp) && vp->m_start.cno == 0) {
v_sol(sp);
return (1);
}
vp->m_stop.cno = 0;
}
/*
* If moving right, non-motion commands move to the end of the range.
* Delete and yank stay at the start. Motion commands adjust the
* ending point to the character before the current ending charcter.
*
* If moving left, all commands move to the end of the range. Motion
* commands adjust the starting point to the character before the
* current starting character.
*/
if (vp->m_start.cno < vp->m_stop.cno)
if (ISMOTION(vp)) {
--vp->m_stop.cno;
vp->m_final = vp->m_start;
} else
vp->m_final = vp->m_stop;
else {
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
}
return (0);
}
/*
* v_first -- ^
* Move to the first non-blank character in this line.
*
* PUBLIC: int v_first __P((SCR *, VICMD *));
*/
int
v_first(SCR *sp, VICMD *vp)
{
/*
* !!!
* Yielding to none in our quest for compatibility with every
* historical blemish of vi, no matter how strange it might be,
* we permit the user to enter a count and then ignore it.
*/
/*
* Move to the first non-blank.
*
* Can't just use RCM_SET_FNB, in case ^ is used as the motion
* component of another command.
*/
vp->m_stop.cno = 0;
if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
return (1);
/*
* !!!
* The ^ command succeeded if used as a command when the cursor was
* on the first non-blank in the line, but failed if used as a motion
* component in the same situation.
*/
if (ISMOTION(vp) && vp->m_start.cno == vp->m_stop.cno) {
v_sol(sp);
return (1);
}
/*
* If moving right, non-motion commands move to the end of the range.
* Delete and yank stay at the start. Motion commands adjust the
* ending point to the character before the current ending charcter.
*
* If moving left, all commands move to the end of the range. Motion
* commands adjust the starting point to the character before the
* current starting character.
*/
if (vp->m_start.cno < vp->m_stop.cno)
if (ISMOTION(vp)) {
--vp->m_stop.cno;
vp->m_final = vp->m_start;
} else
vp->m_final = vp->m_stop;
else {
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
}
return (0);
}
/*
* Compute the earliest time and position of the intersection of a
* sphere and a vertex.
*
* The sphere has radius R and moves along vector V from point P. The
* vertex moves along vector W from point Q in a coordinate system
* based at O.
*/
static float v_vert(float Q[3],
const float o[3],
const float q[3],
const float w[3],
const float p[3],
const float v[3], float r)
{
float O[3], P[3], V[3];
float t = LARGE;
v_add(O, o, q);
v_sub(P, p, O);
v_sub(V, v, w);
if (v_dot(P, V) < 0.0f)
{
t = v_sol(P, V, r);
if (t < LARGE)
v_mad(Q, O, w, t);
}
return t;
}
/*
* v_zero -- 0
* Move to the first column on this line.
*
* PUBLIC: int v_zero __P((SCR *, VICMD *));
*/
int
v_zero(SCR *sp, VICMD *vp)
{
/*
* !!!
* The 0 command succeeded if used as a command in the first column
* but failed if used as a motion component in the same situation.
*/
if (ISMOTION(vp) && vp->m_start.cno == 0) {
v_sol(sp);
return (1);
}
/*
* All commands move to the end of the range. Motion commands
* adjust the starting point to the character before the current
* one.
*/
vp->m_stop.cno = 0;
if (ISMOTION(vp))
--vp->m_start.cno;
vp->m_final = vp->m_stop;
return (0);
}
/*
* Compute the earliest time and position of the intersection of a
* sphere and an edge.
*
* The sphere has radius R and moves along vector V from point P. The
* edge moves along vector W from point Q in a coordinate system based
* at O. The edge extends along the length of vector U.
*/
static float v_edge(float Q[3],
const float o[3],
const float q[3],
const float u[3],
const float w[3],
const float p[3],
const float v[3], float r)
{
float d[3], e[3];
float P[3], V[3];
float du, eu, uu, s, t;
v_sub(d, p, o);
v_sub(d, d, q);
v_sub(e, v, w);
/*
* Think projections. Vectors D, extending from the edge vertex Q
* to the sphere, and E, the relative velocity of sphere wrt the
* edge, are made orthogonal to the edge vector U. Division of
* the dot products is required to obtain the true projection
* ratios since U does not have unit length.
*/
du = v_dot(d, u);
eu = v_dot(e, u);
uu = v_dot(u, u);
v_mad(P, d, u, -du / uu);
/* First, test for intersection. */
if (v_dot(P, P) < r * r)
{
/* The sphere already intersects the line of the edge. */
if (du < 0 || du > uu)
{
/*
* The sphere is behind the endpoints of the edge, and
* can't hit the edge without hitting the vertices first.
*/
return LARGE;
}
/* The sphere already intersects the edge. */
if (v_dot(P, e) >= 0)
{
/* Moving apart. */
return LARGE;
}
v_nrm(P, P);
v_mad(Q, p, P, -r);
return 0;
}
v_mad(V, e, u, -eu / uu);
t = v_sol(P, V, r);
s = (du + eu * t) / uu; /* Projection of D + E * t on U. */
if (0.0f <= t && t < LARGE && 0.0f < s && s < 1.0f)
{
v_mad(d, o, w, t);
v_mad(e, q, u, s);
v_add(Q, e, d);
}
else
t = LARGE;
return t;
}
