From 9e4fd67ba13984f23c7ca58ef36ed90c8fd823df Mon Sep 17 00:00:00 2001 From: Karl Heuer Date: Thu, 20 Feb 1997 06:46:40 +0000 Subject: [PATCH] Include charset.h. (forward_point, Fforward_point): New functions. (Fforward_char, Fdelete_char): Handle multibyte characters by calling forward_point. (Fdelete_backward_char): Pay attention to multibyte characters in overwrite-mode. (internal_self_insert): Handle self inserting a multibyte character. (syms_of_cmds): Handle the new function Fforward_point. --- src/cmds.c | 180 ++++++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 142 insertions(+), 38 deletions(-) diff --git a/src/cmds.c b/src/cmds.c index db05b38460e..c6e5edba7b5 100644 --- a/src/cmds.c +++ b/src/cmds.c @@ -23,6 +23,7 @@ Boston, MA 02111-1307, USA. */ #include "lisp.h" #include "commands.h" #include "buffer.h" +#include "charset.h" #include "syntax.h" #include "window.h" #include "keyboard.h" @@ -40,6 +41,45 @@ Lisp_Object Vself_insert_face_command; extern Lisp_Object Qface; +/* Return buffer position which is N characters after `point'. */ +int +forward_point (n) + int n; +{ + int pos = PT, c; + + if (!NILP (current_buffer->enable_multibyte_characters)) + { + /* Simply adding N to `point' doesn't work because of multi-byte + form. We had better not use INC_POS and DEC_POS because they + check the gap position every time. But, for the moment, we + need working code. */ + if (n > 0) + { + while (pos < ZV && n--) INC_POS (pos); + if (pos < ZV) n++; + } + else + { + while (pos > BEGV && n++) DEC_POS (pos); + if (pos > BEGV) n--; + } + } + pos += n; + + return pos; +} + +DEFUN ("forward-point", Fforward_point, Sforward_point, 1, 1, 0, + "Return buffer position N characters after (before if N negative) point.") + (n) + Lisp_Object n; +{ + CHECK_NUMBER (n, 0); + + return make_number (forward_point (XINT (n))); +} + DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 1, "p", "Move point right N characters (left if N is negative).\n\ On reaching end of buffer, stop and signal error.") @@ -57,7 +97,7 @@ On reaching end of buffer, stop and signal error.") hooks, etcetera), that's not a good approach. So we validate the proposed position, then set point. */ { - int new_point = PT + XINT (n); + int new_point = forward_point (XINT (n)); if (new_point < BEGV) { @@ -120,7 +160,7 @@ With positive N, a non-empty line at the end counts as one line\n\ && (negp || (ZV > BEGV && pos != pos2 - && FETCH_CHAR (pos - 1) != '\n'))) + && FETCH_BYTE (pos - 1) != '\n'))) shortage--; SET_PT (pos); return make_number (negp ? - shortage : shortage); @@ -172,23 +212,26 @@ N was explicitly specified.") (n, killflag) Lisp_Object n, killflag; { + int pos; + CHECK_NUMBER (n, 0); + pos = forward_point (XINT (n)); if (NILP (killflag)) { if (XINT (n) < 0) { - if (PT + XINT (n) < BEGV) + if (pos < BEGV) Fsignal (Qbeginning_of_buffer, Qnil); else - del_range (PT + XINT (n), PT); + del_range (pos, PT); } else { - if (PT + XINT (n) > ZV) + if (pos > ZV) Fsignal (Qend_of_buffer, Qnil); else - del_range (PT, PT + XINT (n)); + del_range (PT, pos); } } else @@ -209,34 +252,41 @@ N was explicitly specified.") { Lisp_Object value; int deleted_special = 0; - int i; + int pos, i; CHECK_NUMBER (n, 0); /* See if we are about to delete a tab or newline backwards. */ - for (i = 1; i <= XINT (n); i++) + pos = PT; + for (i = 0; i < XINT (n) && pos > BEGV; i++) { - if (PT - i < BEGV) - break; - if (FETCH_CHAR (PT - i) == '\t' || FETCH_CHAR (PT - i) == '\n') + int c; + + DEC_POS (pos); + c = FETCH_BYTE (pos); + if (c == '\t' || c == '\n') { deleted_special = 1; break; } } - value = Fdelete_char (make_number (-XINT (n)), killflag); - /* In overwrite mode, back over columns while clearing them out, unless at end of line. */ if (XINT (n) > 0 && ! NILP (current_buffer->overwrite_mode) && ! deleted_special - && ! (PT == ZV || FETCH_CHAR (PT) == '\n')) + && ! (PT == ZV || FETCH_BYTE (PT) == '\n')) { - Finsert_char (make_number (' '), XINT (n)); - SET_PT (PT - XINT (n)); + int column = current_column (); + + value = Fdelete_char (make_number (-XINT (n)), killflag); + i = column - current_column (); + Finsert_char (make_number (' '), i); + SET_PT (PT - i); } + else + value = Fdelete_char (make_number (-XINT (n)), killflag); return value; } @@ -275,49 +325,102 @@ Whichever character you type to run this command is inserted.") return Qnil; } -/* Insert character C1. If NOAUTOFILL is nonzero, don't do autofill +/* Insert character C. If NOAUTOFILL is nonzero, don't do autofill even if it is enabled. If this insertion is suitable for direct output (completely simple), return 0. A value of 1 indicates this *might* not have been simple. A value of 2 means this did things that call for an undo boundary. */ -internal_self_insert (c1, noautofill) - /* This has to be unsigned char; when it is char, - some compilers sign-extend it in SYNTAX_ENTRY, despite - the casts to unsigned char there. */ - unsigned char c1; +internal_self_insert (c, noautofill) + int c; int noautofill; { extern Lisp_Object Fexpand_abbrev (); int hairy = 0; Lisp_Object tem; register enum syntaxcode synt; - register int c = c1; Lisp_Object overwrite; + /* Length of multi-byte form of C. */ + int len; + /* Working buffer and pointer for multi-byte form of C. */ + unsigned char workbuf[4], *str; overwrite = current_buffer->overwrite_mode; if (!NILP (Vbefore_change_function) || !NILP (Vafter_change_function) || !NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions)) hairy = 1; + /* At first, get multi-byte form of C in STR. */ + if (!NILP (current_buffer->enable_multibyte_characters)) + len = CHAR_STRING (c, workbuf, str); + else + workbuf[0] = c, str = workbuf, len = 1; + if (!NILP (overwrite) - && PT < ZV - && (EQ (overwrite, Qoverwrite_mode_binary) - || (c != '\n' && FETCH_CHAR (PT) != '\n')) - && (EQ (overwrite, Qoverwrite_mode_binary) - || FETCH_CHAR (PT) != '\t' - || XINT (current_buffer->tab_width) <= 0 - || XFASTINT (current_buffer->tab_width) > 20 - || !((current_column () + 1) % XFASTINT (current_buffer->tab_width)))) + && PT < ZV) { - del_range (PT, PT + 1); + /* In overwrite-mode, we substitute a character at point (C2, + hereafter) by C. For that, we delete C2 in advance. But, + just substituting C2 by C may move a remaining text in the + line to the right or to the left, which is not preferable. + So we insert more spaces or delete more characters in the + following cases: if C is narrower than C2, after deleting C2, + we fill columns with spaces, if C is wider than C2, we delete + C2 and several characters following C2. */ + + /* A code at `point'. Since this is checked only against + NEWLINE and TAB, we don't need a character code but only the + first byte of multi-byte form. */ + unsigned char c2 = FETCH_BYTE (PT); + /* A column the cursor should be placed at after this insertion. + The correct value should be calculated only when necessary. */ + int target_clm = 0; + + /* Overwriting in binary-mode always substitute C2 by C. But, + overwriting in textual-mode does this substitution in the + case that C is not NEWLINE and C2 is not NEWLINE nor TAB. If + C2 is TAB, the substitution is done only when C2 is currently + expanded to 0 column, or more than 20 columns, or more than + the width of C. */ + if (EQ (overwrite, Qoverwrite_mode_binary) + || (c != '\n' + && c2 != '\n' + && (target_clm = current_column() + WIDTH_BY_CHAR_HEAD (str[0]), + (c2 != '\t' + || XINT (current_buffer->tab_width) <= 0 + || XFASTINT (current_buffer->tab_width) > 20 + || !(target_clm % XFASTINT (current_buffer->tab_width)))))) + { + if (target_clm == 0) + del_range (PT, forward_point (1)); + else + { + int pos = point; + /* The actual cursor position after the trial of moving + to column TARGET_CLM. It is greater than TARGET_CLM + if the TARGET_CLM is middle of multi-column + character. In that case, the new point is set after + that character. */ + int actual_clm = XFASTINT (Fmove_to_column (target_clm)); + + del_range (pos, PT); + if (actual_clm > target_clm) + { + /* We deleted too many columns. Let's fill columns + by spaces so that the remaining text won't move. */ + insert(" ", actual_clm - target_clm); + SET_PT (pos); + } + } + hairy = 2; + } hairy = 2; } if (!NILP (current_buffer->abbrev_mode) && SYNTAX (c) != Sword && NILP (current_buffer->read_only) - && PT > BEGV && SYNTAX (FETCH_CHAR (PT - 1)) == Sword) + && PT > BEGV && SYNTAX (XFASTINT (Fprevious_char ())) == Sword) { int modiff = MODIFF; Lisp_Object sym; @@ -345,20 +448,20 @@ internal_self_insert (c1, noautofill) { Lisp_Object tem; - insert_and_inherit (&c1, 1); - if (c1 == '\n') + insert_and_inherit (str, len); + if (c == '\n') /* After inserting a newline, move to previous line and fill */ /* that. Must have the newline in place already so filling and */ /* justification, if any, know where the end is going to be. */ SET_PT (PT - 1); tem = call0 (current_buffer->auto_fill_function); - if (c1 == '\n') + if (c == '\n') SET_PT (PT + 1); if (!NILP (tem)) hairy = 2; } else - insert_and_inherit (&c1, 1); + insert_and_inherit (str, len); #ifdef HAVE_FACES /* If previous command specified a face to use, use it. */ @@ -366,7 +469,7 @@ internal_self_insert (c1, noautofill) && EQ (current_kboard->Vlast_command, Vself_insert_face_command)) { Lisp_Object before, after; - XSETINT (before, PT - 1); + XSETINT (before, PT - len); XSETINT (after, PT); Fput_text_property (before, after, Qface, Vself_insert_face, Qnil); Vself_insert_face = Qnil; @@ -411,6 +514,7 @@ If `last-command' does not equal this value, we ignore `self-insert-face'."); More precisely, a char with closeparen syntax is self-inserted."); Vblink_paren_function = Qnil; + defsubr (&Sforward_point); defsubr (&Sforward_char); defsubr (&Sbackward_char); defsubr (&Sforward_line); -- 2.39.2