diff options
| -rw-r--r-- | src/buffer.h | 585 |
1 files changed, 294 insertions, 291 deletions
diff --git a/src/buffer.h b/src/buffer.h index 7c17e9899ef..bc15a0632e5 100644 --- a/src/buffer.h +++ b/src/buffer.h @@ -436,306 +436,309 @@ struct buffer_text /* This is the structure that the buffer Lisp object points to. */ struct buffer - { - /* Everything before the `name' slot must be of a non-Lisp_Object type, - and every slot after `name' must be a Lisp_Object. - - Check out mark_buffer (alloc.c) to see why. */ - - EMACS_INT size; - - /* Next buffer, in chain of all buffers including killed buffers. - This chain is used only for garbage collection, in order to - collect killed buffers properly. - Note that vectors and most pseudovectors are all on one chain, - but buffers are on a separate chain of their own. */ - struct buffer *next; - - /* This structure holds the coordinates of the buffer contents - in ordinary buffers. In indirect buffers, this is not used. */ - struct buffer_text own_text; - - /* This points to the `struct buffer_text' that used for this buffer. - In an ordinary buffer, this is the own_text field above. - In an indirect buffer, this is the own_text field of another buffer. */ - struct buffer_text *text; - - /* Char position of point in buffer. */ - int pt; - /* Byte position of point in buffer. */ - int pt_byte; - /* Char position of beginning of accessible range. */ - int begv; - /* Byte position of beginning of accessible range. */ - int begv_byte; - /* Char position of end of accessible range. */ - int zv; - /* Byte position of end of accessible range. */ - int zv_byte; - - /* In an indirect buffer, this points to the base buffer. - In an ordinary buffer, it is 0. */ - struct buffer *base_buffer; - - /* A non-zero value in slot IDX means that per-buffer variable - with index IDX has a local value in this buffer. The index IDX - for a buffer-local variable is stored in that variable's slot - in buffer_local_flags as a Lisp integer. If the index is -1, - this means the variable is always local in all buffers. */ +{ + /* Everything before the `name' slot must be of a non-Lisp_Object type, + and every slot after `name' must be a Lisp_Object. + + Check out mark_buffer (alloc.c) to see why. */ + + EMACS_INT size; + + /* Next buffer, in chain of all buffers including killed buffers. + This chain is used only for garbage collection, in order to + collect killed buffers properly. + Note that vectors and most pseudovectors are all on one chain, + but buffers are on a separate chain of their own. */ + struct buffer *next; + + /* This structure holds the coordinates of the buffer contents + in ordinary buffers. In indirect buffers, this is not used. */ + struct buffer_text own_text; + + /* This points to the `struct buffer_text' that used for this buffer. + In an ordinary buffer, this is the own_text field above. + In an indirect buffer, this is the own_text field of another buffer. */ + struct buffer_text *text; + + /* Char position of point in buffer. */ + int pt; + /* Byte position of point in buffer. */ + int pt_byte; + /* Char position of beginning of accessible range. */ + int begv; + /* Byte position of beginning of accessible range. */ + int begv_byte; + /* Char position of end of accessible range. */ + int zv; + /* Byte position of end of accessible range. */ + int zv_byte; + + /* In an indirect buffer, this points to the base buffer. + In an ordinary buffer, it is 0. */ + struct buffer *base_buffer; + + /* A non-zero value in slot IDX means that per-buffer variable + with index IDX has a local value in this buffer. The index IDX + for a buffer-local variable is stored in that variable's slot + in buffer_local_flags as a Lisp integer. If the index is -1, + this means the variable is always local in all buffers. */ #define MAX_PER_BUFFER_VARS 50 - char local_flags[MAX_PER_BUFFER_VARS]; + char local_flags[MAX_PER_BUFFER_VARS]; - /* Set to the modtime of the visited file when read or written. - -1 means visited file was nonexistent. - 0 means visited file modtime unknown; in no case complain - about any mismatch on next save attempt. */ - int modtime; - /* the value of text->modiff at the last auto-save. */ - int auto_save_modified; - /* The time at which we detected a failure to auto-save, - Or -1 if we didn't have a failure. */ - int auto_save_failure_time; - /* Position in buffer at which display started - the last time this buffer was displayed. */ - int last_window_start; - - /* Set nonzero whenever the narrowing is changed in this buffer. */ - int clip_changed; - - /* If the long line scan cache is enabled (i.e. the buffer-local - variable cache-long-line-scans is non-nil), newline_cache - points to the newline cache, and width_run_cache points to the - width run cache. - - The newline cache records which stretches of the buffer are - known *not* to contain newlines, so that they can be skipped - quickly when we search for newlines. - - The width run cache records which stretches of the buffer are - known to contain characters whose widths are all the same. If - the width run cache maps a character to a value > 0, that value is - the character's width; if it maps a character to zero, we don't - know what its width is. This allows compute_motion to process - such regions very quickly, using algebra instead of inspecting - each character. See also width_table, below. */ - struct region_cache *newline_cache; - struct region_cache *width_run_cache; - - /* Non-zero means don't use redisplay optimizations for - displaying this buffer. */ - unsigned prevent_redisplay_optimizations_p : 1; - - /* Changes in the buffer are recorded here for undo. - t means don't record anything. - This information belongs to the base buffer of an indirect buffer, - But we can't store it in the struct buffer_text - because local variables have to be right in the struct buffer. - So we copy it around in set_buffer_internal. - This comes before `name' because it is marked in a special way. */ - Lisp_Object undo_list; - - /* Everything from here down must be a Lisp_Object */ - - /* The name of this buffer. */ - Lisp_Object name; - - /* The name of the file visited in this buffer, or nil. */ - Lisp_Object filename; - /* Dir for expanding relative file names. */ - Lisp_Object directory; - /* True iff this buffer has been backed up (if you write to the - visited file and it hasn't been backed up, then a backup will - be made). */ - /* This isn't really used by the C code, so could be deleted. */ - Lisp_Object backed_up; - /* Length of file when last read or saved. - This is not in the struct buffer_text - because it's not used in indirect buffers at all. */ - Lisp_Object save_length; - /* File name used for auto-saving this buffer. - This is not in the struct buffer_text - because it's not used in indirect buffers at all. */ - Lisp_Object auto_save_file_name; - - /* Non-nil if buffer read-only. */ - Lisp_Object read_only; - /* "The mark". This is a marker which may - point into this buffer or may point nowhere. */ - Lisp_Object mark; - - /* Alist of elements (SYMBOL . VALUE-IN-THIS-BUFFER) - for all per-buffer variables of this buffer. */ - Lisp_Object local_var_alist; - - /* Symbol naming major mode (eg, lisp-mode). */ - Lisp_Object major_mode; - /* Pretty name of major mode (eg, "Lisp"). */ - Lisp_Object mode_name; - /* Mode line element that controls format of mode line. */ - Lisp_Object mode_line_format; + /* Set to the modtime of the visited file when read or written. + -1 means visited file was nonexistent. + 0 means visited file modtime unknown; in no case complain + about any mismatch on next save attempt. */ + int modtime; + /* the value of text->modiff at the last auto-save. */ + int auto_save_modified; + /* The time at which we detected a failure to auto-save, + Or -1 if we didn't have a failure. */ + int auto_save_failure_time; + /* Position in buffer at which display started + the last time this buffer was displayed. */ + int last_window_start; + + /* Set nonzero whenever the narrowing is changed in this buffer. */ + int clip_changed; + + /* If the long line scan cache is enabled (i.e. the buffer-local + variable cache-long-line-scans is non-nil), newline_cache + points to the newline cache, and width_run_cache points to the + width run cache. + + The newline cache records which stretches of the buffer are + known *not* to contain newlines, so that they can be skipped + quickly when we search for newlines. + + The width run cache records which stretches of the buffer are + known to contain characters whose widths are all the same. If + the width run cache maps a character to a value > 0, that value is + the character's width; if it maps a character to zero, we don't + know what its width is. This allows compute_motion to process + such regions very quickly, using algebra instead of inspecting + each character. See also width_table, below. */ + struct region_cache *newline_cache; + struct region_cache *width_run_cache; + + /* Non-zero means don't use redisplay optimizations for + displaying this buffer. */ + unsigned prevent_redisplay_optimizations_p : 1; + + /* Changes in the buffer are recorded here for undo. + t means don't record anything. + This information belongs to the base buffer of an indirect buffer, + But we can't store it in the struct buffer_text + because local variables have to be right in the struct buffer. + So we copy it around in set_buffer_internal. + This comes before `name' because it is marked in a special way. */ + Lisp_Object undo_list; + + /* Everything from here down must be a Lisp_Object */ + + /* The name of this buffer. */ + Lisp_Object name; + + /* The name of the file visited in this buffer, or nil. */ + Lisp_Object filename; + /* Dir for expanding relative file names. */ + Lisp_Object directory; + /* True iff this buffer has been backed up (if you write to the + visited file and it hasn't been backed up, then a backup will + be made). */ + /* This isn't really used by the C code, so could be deleted. */ + Lisp_Object backed_up; + /* Length of file when last read or saved. + This is not in the struct buffer_text + because it's not used in indirect buffers at all. */ + Lisp_Object save_length; + /* File name used for auto-saving this buffer. + This is not in the struct buffer_text + because it's not used in indirect buffers at all. */ + Lisp_Object auto_save_file_name; + + /* Non-nil if buffer read-only. */ + Lisp_Object read_only; + /* "The mark". This is a marker which may + point into this buffer or may point nowhere. */ + Lisp_Object mark; + + /* Alist of elements (SYMBOL . VALUE-IN-THIS-BUFFER) + for all per-buffer variables of this buffer. */ + Lisp_Object local_var_alist; + + /* Symbol naming major mode (eg, lisp-mode). */ + Lisp_Object major_mode; + /* Pretty name of major mode (eg, "Lisp"). */ + Lisp_Object mode_name; + /* Mode line element that controls format of mode line. */ + Lisp_Object mode_line_format; - /* Analogous to mode_line_format for the line displayed at the top - of windows. Nil means don't display that line. */ - Lisp_Object header_line_format; - - /* Keys that are bound local to this buffer. */ - Lisp_Object keymap; - /* This buffer's local abbrev table. */ - Lisp_Object abbrev_table; - /* This buffer's syntax table. */ - Lisp_Object syntax_table; - /* This buffer's category table. */ - Lisp_Object category_table; - - /* Values of several buffer-local variables */ - /* tab-width is buffer-local so that redisplay can find it - in buffers that are not current */ - Lisp_Object case_fold_search; - Lisp_Object tab_width; - Lisp_Object fill_column; - Lisp_Object left_margin; - /* Function to call when insert space past fill column. */ - Lisp_Object auto_fill_function; - /* nil: text, t: binary. - This value is meaningful only on certain operating systems. */ - /* Actually, we don't need this flag any more because end-of-line - is handled correctly according to the buffer-file-coding-system - of the buffer. Just keeping it for backward compatibility. */ - Lisp_Object buffer_file_type; - - /* Case table for case-conversion in this buffer. - This char-table maps each char into its lower-case version. */ - Lisp_Object downcase_table; - /* Char-table mapping each char to its upper-case version. */ - Lisp_Object upcase_table; - /* Char-table for conversion for case-folding search. */ - Lisp_Object case_canon_table; - /* Char-table of equivalences for case-folding search. */ - Lisp_Object case_eqv_table; - - /* Non-nil means do not display continuation lines. */ - Lisp_Object truncate_lines; - /* Non-nil means display ctl chars with uparrow. */ - Lisp_Object ctl_arrow; - /* Non-nil means display text from right to left. */ - Lisp_Object direction_reversed; - /* Non-nil means do selective display; - see doc string in syms_of_buffer (buffer.c) for details. */ - Lisp_Object selective_display; + /* Analogous to mode_line_format for the line displayed at the top + of windows. Nil means don't display that line. */ + Lisp_Object header_line_format; + + /* Keys that are bound local to this buffer. */ + Lisp_Object keymap; + /* This buffer's local abbrev table. */ + Lisp_Object abbrev_table; + /* This buffer's syntax table. */ + Lisp_Object syntax_table; + /* This buffer's category table. */ + Lisp_Object category_table; + + /* Values of several buffer-local variables */ + /* tab-width is buffer-local so that redisplay can find it + in buffers that are not current */ + Lisp_Object case_fold_search; + Lisp_Object tab_width; + Lisp_Object fill_column; + Lisp_Object left_margin; + /* Function to call when insert space past fill column. */ + Lisp_Object auto_fill_function; + /* nil: text, t: binary. + This value is meaningful only on certain operating systems. */ + /* Actually, we don't need this flag any more because end-of-line + is handled correctly according to the buffer-file-coding-system + of the buffer. Just keeping it for backward compatibility. */ + Lisp_Object buffer_file_type; + + /* Case table for case-conversion in this buffer. + This char-table maps each char into its lower-case version. */ + Lisp_Object downcase_table; + /* Char-table mapping each char to its upper-case version. */ + Lisp_Object upcase_table; + /* Char-table for conversion for case-folding search. */ + Lisp_Object case_canon_table; + /* Char-table of equivalences for case-folding search. */ + Lisp_Object case_eqv_table; + + /* Non-nil means do not display continuation lines. */ + Lisp_Object truncate_lines; + /* Non-nil means display ctl chars with uparrow. */ + Lisp_Object ctl_arrow; + /* Non-nil means display text from right to left. */ + Lisp_Object direction_reversed; + /* Non-nil means do selective display; + see doc string in syms_of_buffer (buffer.c) for details. */ + Lisp_Object selective_display; #ifndef old - /* Non-nil means show ... at end of line followed by invisible lines. */ - Lisp_Object selective_display_ellipses; + /* Non-nil means show ... at end of line followed by invisible lines. */ + Lisp_Object selective_display_ellipses; #endif - /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer. */ - Lisp_Object minor_modes; - /* t if "self-insertion" should overwrite; `binary' if it should also - overwrite newlines and tabs - for editing executables and the like. */ - Lisp_Object overwrite_mode; - /* non-nil means abbrev mode is on. Expand abbrevs automatically. */ - Lisp_Object abbrev_mode; - /* Display table to use for text in this buffer. */ - Lisp_Object display_table; - /* t means the mark and region are currently active. */ - Lisp_Object mark_active; - - /* List of overlays that end at or before the current center, - in order of end-position. */ - Lisp_Object overlays_before; - - /* List of overlays that end after the current center, - in order of start-position. */ - Lisp_Object overlays_after; - - /* Position where the overlay lists are centered. */ - Lisp_Object overlay_center; - - /* Non-nil means the buffer contents are regarded as multi-byte - form of characters, not a binary code. */ - Lisp_Object enable_multibyte_characters; - - /* Coding system to be used for encoding the buffer contents on - saving. */ - Lisp_Object buffer_file_coding_system; - - /* List of symbols naming the file format used for visited file. */ - Lisp_Object file_format; - - /* True if the newline position cache and width run cache are - enabled. See search.c and indent.c. */ - Lisp_Object cache_long_line_scans; - - /* If the width run cache is enabled, this table contains the - character widths width_run_cache (see above) assumes. When we - do a thorough redisplay, we compare this against the buffer's - current display table to see whether the display table has - affected the widths of any characters. If it has, we - invalidate the width run cache, and re-initialize width_table. */ - Lisp_Object width_table; - - /* In an indirect buffer, or a buffer that is the base of an - indirect buffer, this holds a marker that records - PT for this buffer when the buffer is not current. */ - Lisp_Object pt_marker; - - /* In an indirect buffer, or a buffer that is the base of an - indirect buffer, this holds a marker that records - BEGV for this buffer when the buffer is not current. */ - Lisp_Object begv_marker; - - /* In an indirect buffer, or a buffer that is the base of an - indirect buffer, this holds a marker that records - ZV for this buffer when the buffer is not current. */ - Lisp_Object zv_marker; - - /* This holds the point value before the last scroll operation. - Explicitly setting point sets this to nil. */ - Lisp_Object point_before_scroll; - - /* Truename of the visited file, or nil. */ - Lisp_Object file_truename; - - /* Invisibility spec of this buffer. - t => any non-nil `invisible' property means invisible. - A list => `invisible' property means invisible - if it is memq in that list. */ - Lisp_Object invisibility_spec; - - /* This is the last window that was selected with this buffer in it, - or nil if that window no longer displays this buffer. */ - Lisp_Object last_selected_window; - - /* Incremented each time the buffer is displayed in a window. */ - Lisp_Object display_count; + /* Alist of (FUNCTION . STRING) for each minor mode enabled in buffer. */ + Lisp_Object minor_modes; + /* t if "self-insertion" should overwrite; `binary' if it should also + overwrite newlines and tabs - for editing executables and the like. */ + Lisp_Object overwrite_mode; + /* non-nil means abbrev mode is on. Expand abbrevs automatically. */ + Lisp_Object abbrev_mode; + /* Display table to use for text in this buffer. */ + Lisp_Object display_table; + /* t means the mark and region are currently active. */ + Lisp_Object mark_active; + + /* List of overlays that end at or before the current center, + in order of end-position. */ + Lisp_Object overlays_before; + + /* List of overlays that end after the current center, + in order of start-position. */ + Lisp_Object overlays_after; + + /* Position where the overlay lists are centered. */ + Lisp_Object overlay_center; + + /* Non-nil means the buffer contents are regarded as multi-byte + form of characters, not a binary code. */ + Lisp_Object enable_multibyte_characters; + + /* Coding system to be used for encoding the buffer contents on + saving. */ + Lisp_Object buffer_file_coding_system; + + /* List of symbols naming the file format used for visited file. */ + Lisp_Object file_format; + + /* True if the newline position cache and width run cache are + enabled. See search.c and indent.c. */ + Lisp_Object cache_long_line_scans; + + /* If the width run cache is enabled, this table contains the + character widths width_run_cache (see above) assumes. When we + do a thorough redisplay, we compare this against the buffer's + current display table to see whether the display table has + affected the widths of any characters. If it has, we + invalidate the width run cache, and re-initialize width_table. */ + Lisp_Object width_table; + + /* In an indirect buffer, or a buffer that is the base of an + indirect buffer, this holds a marker that records + PT for this buffer when the buffer is not current. */ + Lisp_Object pt_marker; + + /* In an indirect buffer, or a buffer that is the base of an + indirect buffer, this holds a marker that records + BEGV for this buffer when the buffer is not current. */ + Lisp_Object begv_marker; + + /* In an indirect buffer, or a buffer that is the base of an + indirect buffer, this holds a marker that records + ZV for this buffer when the buffer is not current. */ + Lisp_Object zv_marker; + + /* This holds the point value before the last scroll operation. + Explicitly setting point sets this to nil. */ + Lisp_Object point_before_scroll; + + /* Truename of the visited file, or nil. */ + Lisp_Object file_truename; + + /* Invisibility spec of this buffer. + t => any non-nil `invisible' property means invisible. + A list => `invisible' property means invisible + if it is memq in that list. */ + Lisp_Object invisibility_spec; + + /* This is the last window that was selected with this buffer in it, + or nil if that window no longer displays this buffer. */ + Lisp_Object last_selected_window; + + /* Incremented each time the buffer is displayed in a window. */ + Lisp_Object display_count; - /* Widths of left and right marginal areas for windows displaying - this buffer. */ - Lisp_Object left_margin_width, right_margin_width; - - /* Non-nil means indicate lines not displaying text (in a style - like vi). */ - Lisp_Object indicate_empty_lines; - - /* Time stamp updated each time this buffer is displayed in a window. */ - Lisp_Object display_time; - - /* If scrolling the display because point is below the bottom of a - window showing this buffer, try to choose a window start so - that point ends up this number of lines from the top of the - window. Nil means that scrolling method isn't used. */ - Lisp_Object scroll_up_aggressively; + /* Widths of left and right marginal areas for windows displaying + this buffer. */ + Lisp_Object left_margin_width, right_margin_width; + + /* Non-nil means indicate lines not displaying text (in a style + like vi). */ + Lisp_Object indicate_empty_lines; + + /* Time stamp updated each time this buffer is displayed in a window. */ + Lisp_Object display_time; + + /* If scrolling the display because point is below the bottom of a + window showing this buffer, try to choose a window start so + that point ends up this number of lines from the top of the + window. Nil means that scrolling method isn't used. */ + Lisp_Object scroll_up_aggressively; - /* If scrolling the display because point is above the top of a - window showing this buffer, try to choose a window start so - that point ends up this number of lines from the bottom of the - window. Nil means that scrolling method isn't used. */ - Lisp_Object scroll_down_aggressively; + /* If scrolling the display because point is above the top of a + window showing this buffer, try to choose a window start so + that point ends up this number of lines from the bottom of the + window. Nil means that scrolling method isn't used. */ + Lisp_Object scroll_down_aggressively; - Lisp_Object cursor_type; + /* Desired cursor type in this buffer. See the doc string of + per-buffer variable `cursor-type'. */ + Lisp_Object cursor_type; + + /* An integer > 0 means put that number of pixels below text lines + in the display of this buffer. */ + Lisp_Object extra_line_spacing; +}; - /* These are so we don't have to recompile everything - the next few times we add a new slot. */ - Lisp_Object extra2, extra3; - }; /* This points to the current buffer. */ |