int EBuffer::KillCharPrev() {
if (CP.Col == 0) {
if (CP.Row > 0)
if (ExposeRow(VToR(CP.Row) - 1) == 0) return 0;
if (!MoveUp()) return 0;
if (!MoveLineEnd()) return 0;
if (LineJoin()) return 1;
} else {
if (!MovePrev()) return 0;
if (DelText(CP.Row, CP.Col, 1)) return 1;
}
return 0;
}
int EBuffer::FoldDemote(int Line) { /*FOLD00*/
int f = FindFold(Line);
if (Modify() == 0) return 0;
if (f == -1) return 0;
if (FF[f].open == 0) return 0;
if (FF[f].level == 99) return 0;
if (BFI(this, BFI_Undo)) {
if (PushULong(Line) == 0) return 0;
if (PushUChar(ucFoldDemote) == 0) return 0;
}
if ((FF[f].line > 0) && (ExposeRow(FF[f].line - 1) == 0)) return 0;
FF[f].level++;
Draw(Line, Line);
return 1;
}
int EBuffer::BackSpace() {
int Y = VToR(CP.Row);
if (CheckBlock() == 1 && BFI(this, BFI_BackSpKillBlock)) {
if (BlockKill() == 0)
return 0;
} else if (BFI(this, BFI_WordWrap) == 2 && CP.Row > 0 && !IsLineBlank(Y - 1) &&
CP.Col <= BFI(this, BFI_LeftMargin) && CP.Col <= LineIndented(Y)) {
if (SetPos(LineLen(Y - 1), CP.Row - 1) == 0) return 0;
} else if (CP.Col == 0) {
if (CP.Row > 0)
if (ExposeRow(VToR(CP.Row) - 1) == 0) return 0;
if (MoveUp() == 0) return 0;
if (MoveLineEnd() == 0) return 0;
if (LineJoin() == 0) return 0;
} else {
if (BFI(this, BFI_BackSpUnindents) && (LineIndented(Y) == CP.Col)) {
int C = CP.Col, C1 = 0;
int L = VToR(CP.Row);
C1 = C;
while (L > 0 && (IsLineBlank(L - 1) || (C1 = LineIndented(L - 1)) >= C)) L--;
if (L == 0) C1 = 0;
if (C1 == C) C1--;
if (C1 < 0) C1 = 0;
if (C1 > C) C1 = C;
if (SetPos(C1, CP.Row) == 0) return 0;
if (C > LineIndented(Y)) return 0;
if (DelText(Y, C1, C - C1) == 0) return 0;
if (BFI(this, BFI_Insert) == 0)
if (InsText(Y, C1, 1, " ") == 0) return 0;
} else if (BFI(this, BFI_BackSpKillTab)) {
int P;
int C = CP.Col, C1;
P = CharOffset(RLine(Y), C - 1);
C1 = ScreenPos(RLine(Y), P);
if (SetPos(C1, CP.Row) == 0) return 0;
if (DelText(Y, C1, C - C1) == 0) return 0;
if (BFI(this, BFI_Insert) == 0)
if (InsText(Y, C1, 1, " ") == 0) return 0;
} else {
if (MovePrev() == 0) return 0;
ELine *L = RLine(Y);
int C = CharOffset(L, CP.Col);
if (L->Count > 0 && L->Chars[C] == 9) {
/* We're on top of tab character. Skip over all spaces and
tabs so that only the last space/tab gets deleted. */
while (C < L->Count &&
(L->Chars[C+1] == 9 || L->Chars[C+1] == ' ')) C++;
}
if (DelText(Y, ScreenPos(L, C), 1) == 0) return 0;
if (BFI(this, BFI_Insert) == 0)
if (InsText(Y, ScreenPos(L, C), 1, " ") == 0) return 0;
}
}
if (BFI(this, BFI_WordWrap) == 2) {
if (DoWrap(0) == 0) return 0;
}
if (BFI(this, BFI_Trim)) {
Y = VToR(CP.Row);
if (TrimLine(Y) == 0) return 0;
}
return 1;
}