ui.c

VIM文本编辑器

	    break;
    }

    cb->prev.lnum = row;
    cb->prev.col  = col;

#ifdef DEBUG_SELECTION
	printf("Selection is: (%u,%u) to (%u,%u)\n", cb->start.lnum,
		cb->start.col, cb->end.lnum, cb->end.col);
#endif
}

/*
 * Called after an Expose event to redraw the selection
 */
    void
clip_redraw_selection(x, y, w, h)
    int	    x;
    int	    y;
    int	    w;
    int	    h;
{
    VimClipboard    *cb = &clipboard;
    int		    row1, col1, row2, col2;
    int		    row;
    int		    start;
    int		    end;

    if (cb->state == SELECT_CLEARED)
	return;

#ifdef USE_GUI	    /* TODO: how do we invert for non-GUI versions? */
    row1 = check_row(Y_2_ROW(y));
    col1 = check_col(X_2_COL(x));
    row2 = check_row(Y_2_ROW(y + h - 1));
    col2 = check_col(X_2_COL(x + w - 1));

    /* Limit the rows that need to be re-drawn */
    if (cb->start.lnum > row1)
	row1 = cb->start.lnum;
    if (cb->end.lnum < row2)
	row2 = cb->end.lnum;

    /* Look at each row that might need to be re-drawn */
    for (row = row1; row <= row2; row++)
    {
	/* For the first selection row, use the starting selection column */
	if (row == cb->start.lnum)
	    start = cb->start.col;
	else
	    start = 0;

	/* For the last selection row, use the ending selection column */
	if (row == cb->end.lnum)
	    end = cb->end.col;
	else
	    end = Columns;

	if (col1 > start)
	    start = col1;

	if (col2 < end)
	    end = col2 + 1;

	if (end > start)
	    gui_mch_invert_rectangle(row, start, 1, end - start);
    }
#endif
}

/*
 * Redraw the selection if character at "row,col" is inside of it.
 */
    void
clip_may_redraw_selection(row, col)
    int	row, col;
{
    if (clipboard.state != SELECT_CLEARED
	    && ((row == clipboard.start.lnum
		    && col >= (int)clipboard.start.col)
		|| row > clipboard.start.lnum)
	    && ((row == clipboard.end.lnum
		    && col < (int)clipboard.end.col)
		|| row < clipboard.end.lnum))
	clip_invert_area(row, col, row, col + 1);
}

/*
 * Called from outside to clear selected region from the display
 */
    void
clip_clear_selection()
{
    VimClipboard    *cb = &clipboard;

    if (cb->state == SELECT_CLEARED)
	return;

    clip_invert_area((int)cb->start.lnum, cb->start.col, (int)cb->end.lnum,
	    cb->end.col);
    cb->state = SELECT_CLEARED;
}

/*
 * Clear the selection if any lines from "row1" to "row2" are inside of it.
 */
    void
clip_may_clear_selection(row1, row2)
    int	row1, row2;
{
    if (clipboard.state == SELECT_DONE
	    && row2 >= clipboard.start.lnum
	    && row1 <= clipboard.end.lnum)
	clip_clear_selection();
}

/*
 * Called before the screen is scrolled up or down.  Adjusts the line numbers
 * of the selection.  Call with big number when clearing the screen.
 */
    void
clip_scroll_selection(rows)
    int	    rows;		/* negative for scroll down */
{
    int	    lnum;

    if (clipboard.state == SELECT_CLEARED)
	return;

    lnum = clipboard.start.lnum - rows;
    if (lnum <= 0)
	clipboard.start.lnum = 0;
    else if (lnum >= screen_Rows)	/* scrolled off of the screen */
	clipboard.state = SELECT_CLEARED;
    else
	clipboard.start.lnum = lnum;

    lnum = clipboard.end.lnum - rows;
    if (lnum < 0)			/* scrolled off of the screen */
	clipboard.state = SELECT_CLEARED;
    else if (lnum >= screen_Rows)
	clipboard.end.lnum = screen_Rows - 1;
    else
	clipboard.end.lnum = lnum;
}

/*
 * Invert a region of the display between a starting and ending row and column
 */
    static void
clip_invert_area(row1, col1, row2, col2)
    int	    row1;
    int	    col1;
    int	    row2;
    int	    col2;
{
#ifdef USE_GUI	    /* TODO: how do we invert for non-GUI versions? */
    /* Swap the from and to positions so the from is always before */
    if (clip_compare_pos(row1, col1, row2, col2) > 0)
    {
	int tmp_row, tmp_col;
	tmp_row = row1;
	tmp_col = col1;
	row1	= row2;
	col1	= col2;
	row2	= tmp_row;
	col2	= tmp_col;
    }

    /* If all on the same line, do it the easy way */
    if (row1 == row2)
    {
	gui_mch_invert_rectangle(row1, col1, 1, col2 - col1);
	return;
    }

    /* Handle a piece of the first line */
    if (col1 > 0)
    {
	gui_mch_invert_rectangle(row1, col1, 1, (int)Columns - col1);
	row1++;
    }

    /* Handle a piece of the last line */
    if (col2 < Columns - 1)
    {
	gui_mch_invert_rectangle(row2, 0, 1, col2);
	row2--;
    }

    /* Handle the rectangle thats left */
    if (row2 >= row1)
	gui_mch_invert_rectangle(row1, 0, row2 - row1 + 1, (int)Columns);
#endif
}

/*
 * Yank the currently selected area into the special selection buffer so it
 * will be available for pasting.
 */
    static void
clip_yank_non_visual_selection(row1, col1, row2, col2)
    int	    row1;
    int	    col1;
    int	    row2;
    int	    col2;
{
    char_u  *buffer;
    char_u  *bufp;
    int	    row;
    int	    start_col;
    int	    end_col;
    int	    line_end_col;
    int	    add_newline_flag = FALSE;

    /*
     * Make sure row1 <= row2, and if row1 == row2 that col1 <= col2.
     */
    if (row1 > row2)
    {
	row = row1; row1 = row2; row2 = row;
	row = col1; col1 = col2; col2 = row;
    }
    else if (row1 == row2 && col1 > col2)
    {
	row = col1; col1 = col2; col2 = row;
    }

    /* Create a temporary buffer for storing the text */
    buffer = lalloc((row2 - row1 + 1) * Columns + 1, TRUE);
    if (buffer == NULL)	    /* out of memory */
	return;

    /* Process each row in the selection */
    for (bufp = buffer, row = row1; row <= row2; row++)
    {
	if (row == row1)
	    start_col = col1;
	else
	    start_col = 0;

	if (row == row2)
	    end_col = col2;
	else
	    end_col = Columns;

	line_end_col = clip_get_line_end(row);

	/* See if we need to nuke some trailing whitespace */
	if (end_col >= Columns && (row < row2 || end_col > line_end_col))
	{
	    /* Get rid of trailing whitespace */
	    end_col = line_end_col;
	    if (end_col < start_col)
		end_col = start_col;

	    /* If the last line extended to the end, add an extra newline */
	    if (row == row2)
		add_newline_flag = TRUE;
	}

	/* If after the first row, we need to always add a newline */
	if (row > row1)
	    *bufp++ = NL;

	if (row < screen_Rows && end_col <= screen_Columns)
	{
	    STRNCPY(bufp, &LinePointers[row][start_col], end_col - start_col);
	    bufp += end_col - start_col;
	}
    }

    /* Add a newline at the end if the selection ended there */
    if (add_newline_flag)
	*bufp++ = NL;

    clip_yank_selection(MCHAR, buffer, (long)(bufp - buffer));
    vim_free(buffer);
}

/*
 * Find the starting and ending positions of the word at the given row and
 * column.
 */
    static void
clip_get_word_boundaries(cb, row, col)
    VimClipboard    *cb;
    int		    row;
    int		    col;
{
    char    start_class;
    int	    temp_col;

    if (row >= screen_Rows || col >= screen_Columns)
	return;

    start_class = char_class(LinePointers[row][col]);

    temp_col = col;
    for ( ; temp_col > 0; temp_col--)
	if (char_class(LinePointers[row][temp_col - 1]) != start_class)
	    break;

    cb->word_start_col = temp_col;

    temp_col = col;
    for ( ; temp_col < screen_Columns; temp_col++)
	if (char_class(LinePointers[row][temp_col]) != start_class)
	    break;
    cb->word_end_col = temp_col;

#ifdef DEBUG_SELECTION
    printf("Current word: col %u to %u\n", cb->word_start_col,
	    cb->word_end_col);
#endif
}

/*
 * Find the column position for the last non-whitespace character on the given
 * line.
 */
    static int
clip_get_line_end(row)
    int		row;
{
    int	    i;

    if (row >= screen_Rows)
	return 0;
    for (i = screen_Columns; i > 0; i--)
	if (LinePointers[row][i - 1] != ' ')
	    break;
    return i;
}

/*
 * Update the currently selected region by adding and/or subtracting from the
 * beginning or end and inverting the changed area(s).
 */
    static void
clip_update_non_visual_selection(cb, row1, col1, row2, col2)
    VimClipboard    *cb;
    int		    row1;
    int		    col1;
    int		    row2;
    int		    col2;
{
    /* See if we changed at the beginning of the selection */
    if (row1 != cb->start.lnum || col1 != (int)cb->start.col)
    {
	clip_invert_area(row1, col1, (int)cb->start.lnum, cb->start.col);
	cb->start.lnum = row1;
	cb->start.col  = col1;
    }

    /* See if we changed at the end of the selection */
    if (row2 != cb->end.lnum || col2 != (int)cb->end.col)
    {
	clip_invert_area(row2, col2, (int)cb->end.lnum, cb->end.col);
	cb->end.lnum = row2;
	cb->end.col  = col2;
    }
}

#else /* If USE_GUI not defined */

/*
 * Called from outside to clear selected region from the display
 */
    void
clip_clear_selection()
{
    /*
     * Dummy version for now... the point of this code is to set the selected
     * area back to "normal" colour if we are clearing the selection. As we
     * don't have GUI-style mouse selection, we can ignore this for now.
     * Eventually we could actually invert the area in a terminal by redrawing
     * in reverse mode, but we don't do that yet.
     */
    clipboard.state = SELECT_CLEARED;
}
#endif /* USE_GUI */


#endif /* USE_CLIPBOARD */

/*****************************************************************************
 * Functions that handle the input buffer.
 * This is used for any GUI version, and the unix terminal version.
 *
 * For Unix, the input characters are buffered to be able to check for a
 * CTRL-C.  This should be done with signals, but I don't know how to do that
 * in a portable way for a tty in RAW mode.
 */

#if defined(UNIX) || defined(USE_GUI) || defined(OS2) || defined(VMS)

/*
 * Internal typeahead buffer.  Includes extra space for long key code
 * descriptions which would otherwise overflow.  The buffer is considered full
 * when only this extra space (or part of it) remains.
 */
#define INBUFLEN 250

static char_u	inbuf[INBUFLEN + MAX_KEY_CODE_LEN];
static int	inbufcount = 0;	    /* number of chars in inbuf[] */

/*
 * vim_is_input_buf_full(), vim_is_input_buf_empty(), add_to_input_buf(), and
 * trash_input_buf() are functions for manipulating the input buffer.  These
 * are used by the gui_* calls when a GUI is used to handle keyboard input.
 */

    int
vim_is_input_buf_full()
{
    return (inbufcount >= INBUFLEN);
}

    int
vim_is_input_buf_empty()
{
    return (inbufcount == 0);
}

    int
vim_free_in_input_buf()
{
    return (INBUFLEN - inbufcount);
}

/* Add the given bytes to the input buffer */
    void
add_to_input_buf(s, len)
    char_u  *s;
    int	    len;
{
    if (inbufcount + len > INBUFLEN + MAX_KEY_CODE_LEN)
	return;	    /* Shouldn't ever happen! */

    while (len--)
	inbuf[inbufcount++] = *s++;
}

/* Remove everything from the input buffer.  Called when ^C is found */
    void
trash_input_buf()
{
    inbufcount = 0;
}

/*
 * Read as much data from the input buffer as possible up to maxlen, and store
 * it in buf.
 * Note: this function used to be Read() in unix.c
 */
    int
read_from_input_buf(buf, maxlen)
    char_u  *buf;
    long    maxlen;
{
    if (inbufcount == 0)	/* if the buffer is empty, fill it */
	fill_input_buf(TRUE);
    if (maxlen > inbufcount)
	maxlen = inbufcount;
    mch_memmove(buf, inbuf, (size_t)maxlen);
    inbufcount -= maxlen;
    if (inbufcount)
	mch_memmove(inbuf, inbuf + maxlen, (size_t)inbufcount);
    return (int)maxlen;
}

    void
fill_input_buf(exit_on_error)
    int	exit_on_error;
{
#if defined(UNIX) || defined(OS2) || defined(VMS)
    int		len;
    int		try;
    static int	did_read_something = FALSE;
#endif
#ifdef VMS
    extern char ibuf[];
#endif

#ifdef USE_GUI
    if (gui.in_use)
    {
	gui_mch_update();
	return;
    }
#endif
#if defined(UNIX) || defined(OS2) || defined(VMS)
    if (vim_is_input_buf_full())
	return;
    /*
     * Fill_input_buf() is only called when we really need a character.
     * If we can't get any, but there is some in the buffer, just return.
     * If we can't get any, and there isn't any in the buffer, we give up and
     * exit Vim.
     */
# ifdef __BEOS__
    /*
     * On the BeBox version (for now), all input is secretly performed within
     * beos_select() which is called from RealWaitForChar().
     */
    while (!vim_is_input_buf_full() && RealWaitForChar(read_cmd_fd, 0))
	    ;
    len = inbufcount;
    inbufcount = 0;
# else

#ifdef USE_SNIFF
    if (sniff_request_waiting)
    {
	add_to_input_buf((char_u *)"\233sniff",6); /* results in K_SNIFF */
	sniff_request_waiting = 0;
	want_sniff_request = 0;
	return;
    }
#endif
#  ifdef VMS
    while (!vim_is_input_buf_full() && RealWaitForChar(0, 0L))
    {
	add_to_input_buf((char_u *)ibuf, 1);
    }
    if (inbufcount < 1 && !exit_on_error)
	return;
    len = inbufcount;
    inbufcount = 0;
#  else

    for (try = 0; try < 100; ++try)
    {
	len = read(read_cmd_fd, (char *)inbuf + inbufcount,
					     (size_t)(INBUFLEN - inbufcount));
	if (len > 0 || got_int)
	    break;
	/*
	 * If reading stdin results in an error, continue reading stderr.
	 * This helps when using "foo | xargs vim".
	 */
	if (!did_read_something && !isatty(read_cmd_fd) && read_cmd_fd == 0)
	    read_cmd_fd = 2;
	if (!exit_on_error)
	    return;
    }
#  endif /* VMS */
# endif
    if (len <= 0 && !got_int)
	read_error_exit();
    did_read_something = TRUE;
    if (got_int)
    {
	inbuf[inbufcount] = 3;
	inbufcount = 1;
    }
    else
	while (len-- > 0)
	{
	    /*
	     * if a CTRL-C was typed, remove it from the buffer and set got_int
	     */
	    if (inbuf[inbufcount] == 3)
	    {
		/* remove everything typed before the CTRL-C */
		mch_memmove(inbuf, inbuf + inbufcount, (size_t)(len + 1));
		inbufcount = 0;
		got_int = TRUE;
	    }
	    ++inbufcount;
	}
#endif /* UNIX or OS2 or VMS*/
}
#endif /* defined(UNIX) || defined(USE_GUI) || defined(OS2)  || defined(VMS) */

/*
 * Exit because of an input read error.
 */
    void
read_error_exit()
{
    if (silent_mode)	/* Normal way to exit for "ex -s" */
	getout(0);
    STRCPY(IObuff, "Vim: Error reading input, exiting...\n");
    preserve_exit();
}

#if defined(CURSOR_SHAPE) || defined(PROTO)
/*
 * May update the shape of the cursor.
 */
    void
ui_cursor_shape()
{
#ifdef USE_GUI
    if (gui.in_use)
	gui_upd_cursor_shape();
#endif
#if defined(MSDOS) || (defined(WIN32) && !defined(USE_GUI_WIN32))
    mch_update_cursor();
#endif
}
#endif