示例#1
0
文件: move.c 项目: ryanlee/mc
void
mcview_moveto_eol (mcview_t * view)
{
    off_t bol;
    if (view->hex_mode)
    {
        off_t filesize;

        bol = mcview_offset_rounddown (view->hex_cursor, view->bytes_per_line);
        if (mcview_get_byte_indexed (view, bol, view->bytes_per_line - 1, NULL) == TRUE)
        {
            view->hex_cursor = bol + view->bytes_per_line - 1;
        }
        else
        {
            filesize = mcview_get_filesize (view);
            view->hex_cursor = mcview_offset_doz (filesize, 1);
        }
    }
    else
    {
        off_t eol;
        bol = mcview_bol (view, view->dpy_start, 0);
        eol = mcview_eol (view, view->dpy_start, mcview_get_filesize (view));
        if (!view->utf8)
        {
            if (eol > bol)
                view->dpy_text_column = eol - bol;
        }
        else
        {
            char *str = NULL;
            switch (view->datasource)
            {
            case DS_STDIO_PIPE:
            case DS_VFS_PIPE:
                str = mcview_get_ptr_growing_buffer (view, bol);
                break;
            case DS_FILE:
                str = mcview_get_ptr_file (view, bol);
                break;
            case DS_STRING:
                str = mcview_get_ptr_string (view, bol);
                break;
            case DS_NONE:
                break;
            }
            if (str != NULL && eol > bol)
                view->dpy_text_column = g_utf8_strlen (str, eol - bol);
            else
                view->dpy_text_column = eol - bol;
        }
        view->dpy_text_column = max (0, view->dpy_text_column - view->data_area.width);
    }
    mcview_movement_fixups (view, FALSE);
}
示例#2
0
文件: ascii.c 项目: BpArCuCTeMbI/mc
/**
 * Parse, format and possibly display one visual line of text.
 *
 * Formatting starts at the given "state" (which encodes the file offset and parser and formatter's
 * internal state). In unwrap mode, this should point to the beginning of the paragraph with the
 * default state, the additional horizontal scrolling is added here. In wrap mode, this should
 * point to the beginning of the line, with the proper state at that point.
 *
 * In wrap mode, if a line ends in a newline, it is consumed, even if it's exactly at the right
 * edge. In unwrap mode, the whole remaining line, including the newline is consumed. Displaying
 * the next line should start at "state"'s new value, or if we displayed the bottom line then
 * state->offset tells the file offset to be shown in the top bar.
 *
 * If "row" is offscreen, don't actually display the line but still update "state" and return the
 * proper value. This is used by mcview_wrap_move_down to advance in the file.
 *
 * @param view ...
 * @param state the parser-formatter state machine's state, updated
 * @param row print to this row
 * @param paragraph_ended store TRUE if paragraph ended by newline or EOF, FALSE if wraps to next
 *   line
 * @param linewidth store the width of the line here
 * @return the number of rows, that is, 0 if we were already at EOF, otherwise 1
 */
static int
mcview_display_line (WView * view, mcview_state_machine_t * state, int row,
                     gboolean * paragraph_ended, off_t * linewidth)
{
    const screen_dimen left = view->data_area.left;
    const screen_dimen top = view->data_area.top;
    const screen_dimen width = view->data_area.width;
    const screen_dimen height = view->data_area.height;
    off_t dpy_text_column = view->text_wrap_mode ? 0 : view->dpy_text_column;
    screen_dimen col = 0;
    int cs[1 + MAX_COMBINING_CHARS];
    char str[(1 + MAX_COMBINING_CHARS) * UTF8_CHAR_LEN + 1];
    int i, j;

    if (paragraph_ended != NULL)
        *paragraph_ended = TRUE;

    if (!view->text_wrap_mode && (row < 0 || row >= (int) height) && linewidth == NULL)
    {
        /* Optimization: Fast forward to the end of the line, rather than carefully
         * parsing and then not actually displaying it. */
        off_t eol;
        int retval;

        eol = mcview_eol (view, state->offset, mcview_get_filesize (view));
        retval = (eol > state->offset) ? 1 : 0;

        mcview_state_machine_init (state, eol);
        return retval;
    }

    while (TRUE)
    {
        int charwidth = 0;
        mcview_state_machine_t state_saved;
        int n;
        int color;

        state_saved = *state;
        n = mcview_next_combining_char_sequence (view, state, cs, 1 + MAX_COMBINING_CHARS, &color);
        if (n == 0)
        {
            if (linewidth != NULL)
                *linewidth = col;
            return (col > 0) ? 1 : 0;
        }

        if (view->search_start <= state->offset && state->offset < view->search_end)
            color = VIEW_SELECTED_COLOR;

        if (cs[0] == '\n')
        {
            /* New line: reset all formatting state for the next paragraph. */
            mcview_state_machine_init (state, state->offset);
            if (linewidth != NULL)
                *linewidth = col;
            return 1;
        }

        if (mcview_is_non_spacing_mark (view, cs[0]))
        {
            /* Lonely combining character. Probably leftover after too many combining chars. Just ignore. */
            continue;
        }

        /* Nonprintable, or lonely spacing mark */
        if ((!mcview_isprint (view, cs[0]) || mcview_ismark (view, cs[0])) && cs[0] != '\t')
            cs[0] = '.';

        for (i = 0; i < n; i++)
            charwidth += mcview_wcwidth (view, cs[i]);

        /* Adjust the width for TAB. It's handled below along with the normal characters,
         * so that it's wrapped consistently with them, and is painted with the proper
         * attributes (although currently it can't have a special color). */
        if (cs[0] == '\t')
        {
            charwidth = option_tab_spacing - state->unwrapped_column % option_tab_spacing;
            state->print_lonely_combining = TRUE;
        }
        else
            state->print_lonely_combining = FALSE;

        /* In wrap mode only: We're done with this row if the character sequence wouldn't fit.
         * Except if at the first column, because then it wouldn't fit in the next row either.
         * In this extreme case let the unwrapped code below do its best to display it. */
        if (view->text_wrap_mode && (off_t) col + charwidth > dpy_text_column + (off_t) width
            && col > 0)
        {
            *state = state_saved;
            if (paragraph_ended != NULL)
                *paragraph_ended = FALSE;
            if (linewidth != NULL)
                *linewidth = col;
            return 1;
        }

        /* Display, unless outside of the viewport. */
        if (row >= 0 && row < (int) height)
        {
            if ((off_t) col >= dpy_text_column &&
                (off_t) col + charwidth <= dpy_text_column + (off_t) width)
            {
                /* The combining character sequence fits entirely in the viewport. Print it. */
                tty_setcolor (color);
                widget_move (view, top + row, left + ((off_t) col - dpy_text_column));
                if (cs[0] == '\t')
                {
                    for (i = 0; i < charwidth; i++)
                        tty_print_char (' ');
                }
                else
                {
                    j = 0;
                    for (i = 0; i < n; i++)
                        j += mcview_char_display (view, cs[i], str + j);
                    str[j] = '\0';
                    /* This is probably a bug in our tty layer, but tty_print_string
                     * normalizes the string, whereas tty_printf doesn't. Don't normalize,
                     * since we handle combining characters ourselves correctly, it's
                     * better if they are copy-pasted correctly. Ticket 3255. */
                    tty_printf ("%s", str);
                }
            }
            else if ((off_t) col < dpy_text_column && (off_t) col + charwidth > dpy_text_column)
            {
                /* The combining character sequence would cross the left edge of the viewport.
                 * This cannot happen with wrap mode. Print replacement character(s),
                 * or spaces with the correct attributes for partial Tabs. */
                tty_setcolor (color);
                for (i = dpy_text_column;
                     i < (off_t) col + charwidth && i < dpy_text_column + (off_t) width; i++)
                {
                    widget_move (view, top + row, left + (i - dpy_text_column));
                    tty_print_anychar ((cs[0] == '\t') ? ' ' : PARTIAL_CJK_AT_LEFT_MARGIN);
                }
            }
            else if ((off_t) col < dpy_text_column + (off_t) width &&
                     (off_t) col + charwidth > dpy_text_column + (off_t) width)
            {
                /* The combining character sequence would cross the right edge of the viewport
                 * and we're not wrapping. Print replacement character(s),
                 * or spaces with the correct attributes for partial Tabs. */
                tty_setcolor (color);
                for (i = col; i < dpy_text_column + (off_t) width; i++)
                {
                    widget_move (view, top + row, left + (i - dpy_text_column));
                    tty_print_anychar ((cs[0] == '\t') ? ' ' : PARTIAL_CJK_AT_RIGHT_MARGIN);
                }
            }
        }

        col += charwidth;
        state->unwrapped_column += charwidth;

        if (!view->text_wrap_mode && (off_t) col >= dpy_text_column + (off_t) width
            && linewidth == NULL)
        {
            /* Optimization: Fast forward to the end of the line, rather than carefully
             * parsing and then not actually displaying it. */
            off_t eol;

            eol = mcview_eol (view, state->offset, mcview_get_filesize (view));
            mcview_state_machine_init (state, eol);
            return 1;
        }
    }
}
示例#3
0
文件: move.c 项目: ryanlee/mc
void
mcview_move_down (mcview_t * view, off_t lines)
{
    off_t last_byte;
    last_byte = mcview_get_filesize (view);
    if (view->hex_mode)
    {
        off_t i, limit;

        if (last_byte >= (off_t) view->bytes_per_line)
            limit = last_byte - view->bytes_per_line;
        else
            limit = 0;
        for (i = 0; i < lines && view->hex_cursor < limit; i++)
        {
            view->hex_cursor += view->bytes_per_line;
            if (lines != 1)
                view->dpy_start += view->bytes_per_line;
        }
    }
    else
    {
        off_t new_offset = 0;

        if (view->dpy_end - view->dpy_start > last_byte - view->dpy_end)
        {
            while (lines-- > 0)
            {
                if (view->text_wrap_mode)
                    view->dpy_end =
                        mcview_eol (view, view->dpy_end,
                                    view->dpy_end + (off_t) view->data_area.width);
                else
                    view->dpy_end = mcview_eol (view, view->dpy_end, last_byte);

                if (view->text_wrap_mode)
                    new_offset =
                        mcview_eol (view, view->dpy_start,
                                    view->dpy_start + (off_t) view->data_area.width);
                else
                    new_offset = mcview_eol (view, view->dpy_start, last_byte);
                if (new_offset < last_byte)
                    view->dpy_start = new_offset;
                if (view->dpy_end >= last_byte)
                    break;
            }
        }
        else
        {
            off_t i;
            for (i = 0; i < lines && new_offset < last_byte; i++)
            {
                if (view->text_wrap_mode)
                    new_offset =
                        mcview_eol (view, view->dpy_start,
                                    view->dpy_start + (off_t) view->data_area.width);
                else
                    new_offset = mcview_eol (view, view->dpy_start, last_byte);
                if (new_offset < last_byte)
                    view->dpy_start = new_offset;
            }
        }
    }
    mcview_movement_fixups (view, TRUE);
}