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Commit 182ce2d2 authored by Eli Zaretskii's avatar Eli Zaretskii
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Started work on reordering display strings. Refactor FETCH_CHAR. 

Only compiled, not tested.

 src/xdisp.c (compute_display_string_pos): New function.
 (reseat_1): Initialize bidi_it.disp_pos.
 src/bidi.c (bidi_copy_it): Use offsetof.
 (bidi_fetch_char, bidi_fetch_char_advance): New functions.
 (bidi_cache_search, bidi_cache_iterator_state)
 (bidi_paragraph_init, bidi_resolve_explicit, bidi_resolve_weak)
 (bidi_level_of_next_char, bidi_move_to_visually_next): Support
 character positions inside a run of characters covered by a
 display string.
 (bidi_paragraph_init, bidi_resolve_explicit_1)
 (bidi_level_of_next_char): Call bidi_fetch_char and
 bidi_fetch_char_advance instead of FETCH_CHAR and
 FETCH_CHAR_ADVANCE.
 (bidi_init_it): Initialize new members.
 (LRE_CHAR, RLE_CHAR, PDF_CHAR, LRO_CHAR, RLO_CHAR): Remove macro
 definitions.
 (bidi_explicit_dir_char): Lookup character type in bidi_type_table,
 instead of using explicit *_CHAR codes.
 (bidi_resolve_explicit, bidi_resolve_weak): Use
 FETCH_MULTIBYTE_CHAR instead of FETCH_CHAR, as reordering of
 bidirectional text is supported only in multibyte buffers.
 src/dispextern.h (struct bidi_it): New members nchars and disp_pos.
 ch_len is now EMACS_INT.
 (compute_display_string_pos): Declare prototype.
parent ffb54e99
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Showing with 232 additions and 70 deletions
src/ChangeLog
View file @ 182ce2d2
2011-05-10 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (compute_display_string_pos): New function.
(reseat_1): Initialize bidi_it.disp_pos.
* bidi.c (bidi_copy_it): Use offsetof.
(bidi_fetch_char, bidi_fetch_char_advance): New functions.
(bidi_cache_search, bidi_cache_iterator_state)
(bidi_paragraph_init, bidi_resolve_explicit, bidi_resolve_weak)
(bidi_level_of_next_char, bidi_move_to_visually_next): Support
character positions inside a run of characters covered by a
display string.
(bidi_paragraph_init, bidi_resolve_explicit_1)
(bidi_level_of_next_char): Call bidi_fetch_char and
bidi_fetch_char_advance instead of FETCH_CHAR and
FETCH_CHAR_ADVANCE.
(bidi_init_it): Initialize new members.
(LRE_CHAR, RLE_CHAR, PDF_CHAR, LRO_CHAR, RLO_CHAR): Remove macro
definitions.
(bidi_explicit_dir_char): Lookup character type in bidi_type_table,
instead of using explicit *_CHAR codes.
(bidi_resolve_explicit, bidi_resolve_weak): Use
FETCH_MULTIBYTE_CHAR instead of FETCH_CHAR, as reordering of
bidirectional text is supported only in multibyte buffers.
* dispextern.h (struct bidi_it): New members nchars and disp_pos.
ch_len is now EMACS_INT.
(compute_display_string_pos): Declare prototype.
2011-05-09 Andreas Schwab <schwab@linux-m68k.org>
* w32menu.c (set_frame_menubar): Fix submenu allocation.
......
src/bidi.c
View file @ 182ce2d2
......@@ -62,15 +62,8 @@ static int bidi_initialized = 0;
static Lisp_Object bidi_type_table, bidi_mirror_table;
/* FIXME: Remove these when bidi_explicit_dir_char uses a lookup table. */
#define LRM_CHAR 0x200E
#define RLM_CHAR 0x200F
#define LRE_CHAR 0x202A
#define RLE_CHAR 0x202B
#define PDF_CHAR 0x202C
#define LRO_CHAR 0x202D
#define RLO_CHAR 0x202E
#define BIDI_EOB -1
/* Local data structures. (Look in dispextern.h for the rest.) */
......@@ -258,7 +251,7 @@ bidi_copy_it (struct bidi_it *to, struct bidi_it *from)
int i;
/* Copy everything except the level stack and beyond. */
memcpy (to, from, ((size_t)&((struct bidi_it *)0)->level_stack[0]));
memcpy (to, from, offsetof (struct bidi_it, level_stack[0]));
/* Copy the active part of the level stack. */
to->level_stack[0] = from->level_stack[0]; /* level zero is always in use */
......@@ -319,10 +312,17 @@ bidi_cache_search (EMACS_INT charpos, int level, int dir)
if (bidi_cache_idx)
{
if (charpos < bidi_cache[bidi_cache_last_idx].charpos)
dir = -1;
else if (charpos > bidi_cache[bidi_cache_last_idx].charpos)
dir = 1;
if (dir)
{
dir = -1;
i_start = bidi_cache_last_idx - 1;
}
else if (charpos > (bidi_cache[bidi_cache_last_idx].charpos
+ bidi_cache[bidi_cache_last_idx].nchars - 1))
{
dir = 1;
i_start = bidi_cache_last_idx + 1;
}
else if (dir)
i_start = bidi_cache_last_idx;
else
{
......@@ -334,14 +334,16 @@ bidi_cache_search (EMACS_INT charpos, int level, int dir)
{
/* Linear search for now; FIXME! */
for (i = i_start; i >= 0; i--)
if (bidi_cache[i].charpos == charpos
if (bidi_cache[i].charpos <= charpos
&& charpos < bidi_cache[i].charpos + bidi_cache[i].nchars
&& (level == -1 || bidi_cache[i].resolved_level <= level))
return i;
}
else
{
for (i = i_start; i < bidi_cache_idx; i++)
if (bidi_cache[i].charpos == charpos
if (bidi_cache[i].charpos <= charpos
&& charpos < bidi_cache[i].charpos + bidi_cache[i].nchars
&& (level == -1 || bidi_cache[i].resolved_level <= level))
return i;
}
......@@ -426,7 +428,8 @@ bidi_cache_iterator_state (struct bidi_it *bidi_it, int resolved)
If we are outside the range of cached positions, the cache is
useless and must be reset. */
if (idx > 0 &&
(bidi_it->charpos > bidi_cache[idx - 1].charpos + 1
(bidi_it->charpos > (bidi_cache[idx - 1].charpos
+ bidi_cache[idx - 1].nchars)
|| bidi_it->charpos < bidi_cache[0].charpos))
{
bidi_cache_reset ();
......@@ -548,6 +551,7 @@ bidi_set_sor_type (struct bidi_it *bidi_it, int level_before, int level_after)
bidi_it->ignore_bn_limit = 0; /* meaning it's unknown */
}
/* Perform initializations for reordering a new line of bidi text. */
static void
bidi_line_init (struct bidi_it *bidi_it)
{
......@@ -565,6 +569,77 @@ bidi_line_init (struct bidi_it *bidi_it)
bidi_cache_reset ();
}
/* Fetch and return the character at BYTEPOS. If that character is
covered by a display string, treat the entire run of covered
characters as a single character u+FFFC, and return their combined
length in CH_LEN and NCHARS. DISP_POS specifies the byte position
of the next display string, or -1 if not yet computed. When the
next character is at or beyond that position, the function updates
DISP_POS with the position of the next display string. */
static INLINE int
bidi_fetch_char (EMACS_INT bytepos, EMACS_INT *disp_pos,
EMACS_INT *ch_len, EMACS_INT *nchars)
{
int ch;
/* FIXME: Support strings in addition to buffers. */
/* If we got past the last known position of display string, compute
the position of the next one. That position could be at BYTEPOS. */
if (bytepos < ZV_BYTE && bytepos > *disp_pos)
*disp_pos = compute_display_string_pos (bytepos);
if (bytepos >= ZV_BYTE)
{
ch = BIDI_EOB;
*ch_len = 1;
*nchars = 1;
}
#if 0
else if (bytepos >= *disp_pos)
{
/* support characters covered by a display string */
ch = 0xFFFC; /* Unicode Object Replacement Character */
}
#endif
else
{
ch = FETCH_MULTIBYTE_CHAR (bytepos);
*ch_len = CHAR_BYTES (ch);
*nchars = 1;
}
/* If we just entered a run of characters covered by a display
string, compute the position of the next display string. */
if (bytepos + *ch_len <= ZV_BYTE && bytepos + *ch_len > *disp_pos)
*disp_pos = compute_display_string_pos (bytepos + *ch_len);
return ch;
}
/* Looks like we won't need this one. */
#if 0
/* Fetch character at CHARPOS/BYTEPOS. Return the character, and
advance CHARPOS and BYTEPOS to the next character in logical
order. */
static INLINE int
bidi_fetch_char_advance (EMACS_INT *charpos, EMACS_INT *bytepos)
{
int ch;
/* FIXME: Support strings in addition to buffers. */
FETCH_CHAR_ADVANCE_NO_CHECK (ch, charpos, bytepos);
#if 0
if (...)
{
/* FIXME: Support characters covered by display strings. */
ch = 0xFFFC;
}
#endif
return ch;
}
#endif
/* Find the beginning of this paragraph by looking back in the buffer.
Value is the byte position of the paragraph's beginning. */
static EMACS_INT
......@@ -576,6 +651,10 @@ bidi_find_paragraph_start (EMACS_INT pos, EMACS_INT pos_byte)
while (pos_byte > BEGV_BYTE
&& fast_looking_at (re, pos, pos_byte, limit, limit_byte, Qnil) < 0)
{
/* FIXME: What if the paragraph beginning is covered by a
display string? And what if a display string covering some
of the text over which we scan back includes
paragraph_start_re? */
pos = find_next_newline_no_quit (pos - 1, -1);
pos_byte = CHAR_TO_BYTE (pos);
}
......@@ -587,7 +666,7 @@ bidi_find_paragraph_start (EMACS_INT pos, EMACS_INT pos_byte)
R2L, just use that. Otherwise, determine the paragraph direction
from the first strong directional character of the paragraph.
NO_DEFAULT_P non-nil means don't default to L2R if the paragraph
NO_DEFAULT_P non-zero means don't default to L2R if the paragraph
has no strong directional characters and both DIR and
bidi_it->paragraph_dir are NEUTRAL_DIR. In that case, search back
in the buffer until a paragraph is found with a strong character,
......@@ -622,8 +701,9 @@ bidi_paragraph_init (bidi_dir_t dir, struct bidi_it *bidi_it, int no_default_p)
}
else if (dir == NEUTRAL_DIR) /* P2 */
{
int ch, ch_len;
EMACS_INT pos;
int ch;
EMACS_INT ch_len, nchars;
EMACS_INT pos, disp_pos = -1;
bidi_type_t type;
if (!bidi_initialized)
......@@ -658,12 +738,11 @@ bidi_paragraph_init (bidi_dir_t dir, struct bidi_it *bidi_it, int no_default_p)
is non-zero. */
do {
bytepos = pstartbyte;
ch = FETCH_CHAR (bytepos);
ch_len = CHAR_BYTES (ch);
ch = bidi_fetch_char (bytepos, &ch_len, &nchars, &disp_pos);
pos = BYTE_TO_CHAR (bytepos);
type = bidi_get_type (ch, NEUTRAL_DIR);
for (pos++, bytepos += ch_len;
for (pos += nchars, bytepos += ch_len;
/* NOTE: UAX#9 says to search only for L, AL, or R types
of characters, and ignore RLE, RLO, LRE, and LRO.
However, I'm not sure it makes sense to omit those 4;
......@@ -683,7 +762,9 @@ bidi_paragraph_init (bidi_dir_t dir, struct bidi_it *bidi_it, int no_default_p)
type = NEUTRAL_B;
break;
}
FETCH_CHAR_ADVANCE (ch, pos, bytepos);
ch = bidi_fetch_char (bytepos, &ch_len, &nchars, &disp_pos);
pos += nchars;
bytepos += ch_len;
}
if (type == STRONG_R || type == STRONG_AL) /* P3 */
bidi_it->paragraph_dir = R2L;
......@@ -702,6 +783,9 @@ bidi_paragraph_init (bidi_dir_t dir, struct bidi_it *bidi_it, int no_default_p)
/* Find the beginning of the previous paragraph, if any. */
while (pbyte > BEGV_BYTE && prevpbyte >= pstartbyte)
{
/* FXIME: What if p is covered by a display
string? See also a FIXME inside
bidi_find_paragraph_start. */
p--;
pbyte = CHAR_TO_BYTE (p);
prevpbyte = bidi_find_paragraph_start (p, pbyte);
......@@ -738,7 +822,7 @@ bidi_set_paragraph_end (struct bidi_it *bidi_it)
bidi_it->resolved_level = bidi_it->level_stack[0].level;
}
/* Initialize the bidi iterator from buffer position CHARPOS. */
/* Initialize the bidi iterator from buffer/string position CHARPOS. */
void
bidi_init_it (EMACS_INT charpos, EMACS_INT bytepos, struct bidi_it *bidi_it)
{
......@@ -746,6 +830,7 @@ bidi_init_it (EMACS_INT charpos, EMACS_INT bytepos, struct bidi_it *bidi_it)
bidi_initialize ();
bidi_it->charpos = charpos;
bidi_it->bytepos = bytepos;
bidi_it->nchars = -1; /* to be computed in bidi_resolve_explicit_1 */
bidi_it->first_elt = 1;
bidi_set_paragraph_end (bidi_it);
bidi_it->new_paragraph = 1;
......@@ -767,6 +852,7 @@ bidi_init_it (EMACS_INT charpos, EMACS_INT bytepos, struct bidi_it *bidi_it)
bidi_it->prev_for_neutral.type_after_w1 =
bidi_it->prev_for_neutral.orig_type = UNKNOWN_BT;
bidi_it->sor = L2R; /* FIXME: should it be user-selectable? */
bidi_it->disp_pos = -1; /* invalid/unknown */
bidi_cache_shrink ();
}
......@@ -829,12 +915,16 @@ bidi_resolve_neutral_1 (bidi_type_t prev_type, bidi_type_t next_type, int lev)
}
static INLINE int
bidi_explicit_dir_char (int c)
bidi_explicit_dir_char (int ch)
{
/* FIXME: this should be replaced with a lookup table with suitable
bits set, like standard C ctype macros do. */
return (c == LRE_CHAR || c == LRO_CHAR
|| c == RLE_CHAR || c == RLO_CHAR || c == PDF_CHAR);
bidi_type_t ch_type;
if (!bidi_initialized)
abort ();
ch_type = (bidi_type_t) XINT (CHAR_TABLE_REF (bidi_type_table, ch));
return (ch_type == LRE || ch_type == LRO
|| ch_type == RLE || ch_type == RLO
|| ch_type == PDF);
}
/* A helper function for bidi_resolve_explicit. It advances to the
......@@ -850,7 +940,10 @@ bidi_resolve_explicit_1 (struct bidi_it *bidi_it)
int new_level;
bidi_dir_t override;
if (bidi_it->bytepos < BEGV_BYTE /* after reseat to BEGV? */
/* If reseat()'ed, don't advance, so as to start iteration from the
position where we were reseated. bidi_it->bytepos can be less
than BEGV_BYTE after reseat to BEGV. */
if (bidi_it->bytepos < BEGV_BYTE
|| bidi_it->first_elt)
{
bidi_it->first_elt = 0;
......@@ -860,7 +953,9 @@ bidi_resolve_explicit_1 (struct bidi_it *bidi_it)
}
else if (bidi_it->bytepos < ZV_BYTE) /* don't move at ZV */
{
bidi_it->charpos++;
/* Advance to the next character, skipping characters covered by
display strings (nchars > 1). */
bidi_it->charpos += bidi_it->nchars;
if (bidi_it->ch_len == 0)
abort ();
bidi_it->bytepos += bidi_it->ch_len;
......@@ -870,17 +965,20 @@ bidi_resolve_explicit_1 (struct bidi_it *bidi_it)
override = bidi_it->level_stack[bidi_it->stack_idx].override;
new_level = current_level;
/* in case it is a unibyte character (not yet implemented) */
/* _fetch_multibyte_char_len = 1; */
if (bidi_it->bytepos >= ZV_BYTE)
{
curchar = BIDI_EOB;
bidi_it->ch_len = 1;
bidi_it->nchars = 1;
bidi_it->disp_pos = ZV_BYTE;
}
else
{
curchar = FETCH_CHAR (bidi_it->bytepos);
bidi_it->ch_len = CHAR_BYTES (curchar);
/* Fetch the character at BYTEPOS. If it is covered by a
display string, treat the entire run of covered characters as
a single character u+FFFC. */
curchar = bidi_fetch_char (bidi_it->bytepos, &bidi_it->ch_len,
&bidi_it->nchars, &bidi_it->disp_pos);
}
bidi_it->ch = curchar;
......@@ -1006,10 +1104,10 @@ bidi_resolve_explicit_1 (struct bidi_it *bidi_it)
}
/* Given an iterator state in BIDI_IT, advance one character position
in the buffer to the next character (in the logical order), resolve
any explicit embeddings and directional overrides, and return the
embedding level of the character after resolving explicit
directives and ignoring empty embeddings. */
in the buffer/string to the next character (in the logical order),
resolve any explicit embeddings and directional overrides, and
return the embedding level of the character after resolving
explicit directives and ignoring empty embeddings. */
static int
bidi_resolve_explicit (struct bidi_it *bidi_it)
{
......@@ -1020,8 +1118,8 @@ bidi_resolve_explicit (struct bidi_it *bidi_it)
&& bidi_it->type == WEAK_BN
&& bidi_it->ignore_bn_limit == 0 /* only if not already known */
&& bidi_it->bytepos < ZV_BYTE /* not already at EOB */
&& bidi_explicit_dir_char (FETCH_CHAR (bidi_it->bytepos
+ bidi_it->ch_len)))
&& bidi_explicit_dir_char (FETCH_MULTIBYTE_CHAR (bidi_it->bytepos
+ bidi_it->ch_len)))
{
/* Avoid pushing and popping embedding levels if the level run
is empty, as this breaks level runs where it shouldn't.
......@@ -1033,14 +1131,16 @@ bidi_resolve_explicit (struct bidi_it *bidi_it)
bidi_copy_it (&saved_it, bidi_it);
while (bidi_explicit_dir_char (FETCH_CHAR (bidi_it->bytepos
+ bidi_it->ch_len)))
while (bidi_explicit_dir_char (FETCH_MULTIBYTE_CHAR (bidi_it->bytepos
+ bidi_it->ch_len)))
{
/* This advances to the next character, skipping any
characters covered by display strings. */
level = bidi_resolve_explicit_1 (bidi_it);
}
if (level == prev_level) /* empty embedding */
saved_it.ignore_bn_limit = bidi_it->charpos + 1;
saved_it.ignore_bn_limit = bidi_it->charpos + bidi_it->nchars;
else /* this embedding is non-empty */
saved_it.ignore_bn_limit = -1;
......@@ -1076,8 +1176,8 @@ bidi_resolve_explicit (struct bidi_it *bidi_it)
return new_level;
}
/* Advance in the buffer, resolve weak types and return the type of
the next character after weak type resolution. */
/* Advance in the buffer/string, resolve weak types and return the
type of the next character after weak type resolution. */
static bidi_type_t
bidi_resolve_weak (struct bidi_it *bidi_it)
{
......@@ -1156,7 +1256,8 @@ bidi_resolve_weak (struct bidi_it *bidi_it)
{
next_char =
bidi_it->bytepos + bidi_it->ch_len >= ZV_BYTE
? BIDI_EOB : FETCH_CHAR (bidi_it->bytepos + bidi_it->ch_len);
? BIDI_EOB : FETCH_MULTIBYTE_CHAR (bidi_it->bytepos
+ bidi_it->ch_len);
type_of_next = bidi_get_type (next_char, override);
if (type_of_next == WEAK_BN
......@@ -1204,11 +1305,12 @@ bidi_resolve_weak (struct bidi_it *bidi_it)
type = WEAK_EN;
else /* W5: ET/BN with EN after it. */
{
EMACS_INT en_pos = bidi_it->charpos + 1;
EMACS_INT en_pos = bidi_it->charpos + bidi_it->nchars;
next_char =
bidi_it->bytepos + bidi_it->ch_len >= ZV_BYTE
? BIDI_EOB : FETCH_CHAR (bidi_it->bytepos + bidi_it->ch_len);
? BIDI_EOB : FETCH_MULTIBYTE_CHAR (bidi_it->bytepos
+ bidi_it->ch_len);
type_of_next = bidi_get_type (next_char, override);
if (type_of_next == WEAK_ET
......@@ -1299,8 +1401,8 @@ bidi_resolve_neutral (struct bidi_it *bidi_it)
/* Arrrgh!! The UAX#9 algorithm is too deeply entrenched in
the assumption of batch-style processing; see clauses W4,
W5, and especially N1, which require to look far forward
(as well as back) in the buffer. May the fleas of a
thousand camels infest the armpits of those who design
(as well as back) in the buffer/string. May the fleas of
a thousand camels infest the armpits of those who design
supposedly general-purpose algorithms by looking at their
own implementations, and fail to consider other possible
implementations! */
......@@ -1391,8 +1493,9 @@ bidi_resolve_neutral (struct bidi_it *bidi_it)
}
/* Given an iterator state in BIDI_IT, advance one character position
in the buffer to the next character (in the logical order), resolve
the bidi type of that next character, and return that type. */
in the buffer/string to the next character (in the logical order),
resolve the bidi type of that next character, and return that
type. */
static bidi_type_t
bidi_type_of_next_char (struct bidi_it *bidi_it)
{
......@@ -1416,15 +1519,16 @@ bidi_type_of_next_char (struct bidi_it *bidi_it)
}
/* Given an iterator state BIDI_IT, advance one character position in
the buffer to the next character (in the logical order), resolve
the embedding and implicit levels of that next character, and
return the resulting level. */
the buffer/string to the next character (in the current scan
direction), resolve the embedding and implicit levels of that next
character, and return the resulting level. */
static int
bidi_level_of_next_char (struct bidi_it *bidi_it)
{
bidi_type_t type;
int level, prev_level = -1;
struct bidi_saved_info next_for_neutral;
EMACS_INT next_char_pos;
if (bidi_it->scan_dir == 1)
{
......@@ -1466,8 +1570,14 @@ bidi_level_of_next_char (struct bidi_it *bidi_it)
}
next_for_neutral = bidi_it->next_for_neutral;
/* Perhaps it is already cached. */
type = bidi_cache_find (bidi_it->charpos + bidi_it->scan_dir, -1, bidi_it);
/* Perhaps the character we want is already cached. If it is, the
call to bidi_cache_find below will return a type other than
UNKNOWN_BT. */
if (bidi_it->scan_dir > 0)
next_char_pos = bidi_it->charpos + bidi_it->nchars;
else
next_char_pos = bidi_it->charpos - 1;
type = bidi_cache_find (next_char_pos, -1, bidi_it);
if (type != UNKNOWN_BT)
{
/* Don't lose the information for resolving neutrals! The
......@@ -1529,14 +1639,13 @@ bidi_level_of_next_char (struct bidi_it *bidi_it)
int clen = bidi_it->ch_len;
EMACS_INT bpos = bidi_it->bytepos;
EMACS_INT cpos = bidi_it->charpos;
EMACS_INT disp_pos = bidi_it->disp_pos;
EMACS_INT nc;
bidi_type_t chtype;
do {
/*_fetch_multibyte_char_len = 1;*/
ch = bpos + clen >= ZV_BYTE ? BIDI_EOB : FETCH_CHAR (bpos + clen);
bpos += clen;
cpos++;
clen = (ch == BIDI_EOB ? 1 : CHAR_BYTES (ch));
ch = bidi_fetch_char (bpos += clen, &clen, &nc, &disp_pos);
cpos += nc;
if (ch == '\n' || ch == BIDI_EOB /* || ch == LINESEP_CHAR */)
chtype = NEUTRAL_B;
else
......@@ -1615,8 +1724,8 @@ bidi_level_of_next_char (struct bidi_it *bidi_it)
If this level's other edge is cached, we simply jump to it, filling
the iterator structure with the iterator state on the other edge.
Otherwise, we walk the buffer until we come back to the same level
as LEVEL.
Otherwise, we walk the buffer or string until we come back to the
same level as LEVEL.
Note: we are not talking here about a ``level run'' in the UAX#9
sense of the term, but rather about a ``level'' which includes
......@@ -1680,6 +1789,7 @@ bidi_move_to_visually_next (struct bidi_it *bidi_it)
sentinel.bytepos--;
sentinel.ch = '\n'; /* doesn't matter, but why not? */
sentinel.ch_len = 1;
sentinel.nchars = 1;
}
bidi_cache_iterator_state (&sentinel, 1);
}
......@@ -1750,14 +1860,15 @@ bidi_move_to_visually_next (struct bidi_it *bidi_it)
&& bidi_it->bytepos < ZV_BYTE)
{
EMACS_INT sep_len =
bidi_at_paragraph_end (bidi_it->charpos + 1,
bidi_at_paragraph_end (bidi_it->charpos + bidi_it->nchars,
bidi_it->bytepos + bidi_it->ch_len);
if (sep_len >= 0)
{
bidi_it->new_paragraph = 1;
/* Record the buffer position of the last character of the
paragraph separator. */
bidi_it->separator_limit = bidi_it->charpos + 1 + sep_len;
bidi_it->separator_limit =
bidi_it->charpos + bidi_it->nchars + sep_len;
}
}
......@@ -1767,7 +1878,8 @@ bidi_move_to_visually_next (struct bidi_it *bidi_it)
last cached position, the cache's job is done and we can
discard it. */
if (bidi_it->resolved_level == bidi_it->level_stack[0].level
&& bidi_it->charpos > bidi_cache[bidi_cache_idx - 1].charpos)
&& bidi_it->charpos > (bidi_cache[bidi_cache_idx - 1].charpos
+ bidi_cache[bidi_cache_idx - 1].nchars - 1))
bidi_cache_reset ();
/* But as long as we are caching during forward scan, we must
cache each state, or else the cache integrity will be
......
src/dispextern.h
View file @ 182ce2d2
......@@ -1812,12 +1812,16 @@ struct bidi_stack {
bidi_dir_t override;
};
/* Data type for iterating over bidi text. */
/* Data type for reordering bidirectional text. */
struct bidi_it {
EMACS_INT bytepos; /* iterator's position in buffer */
EMACS_INT charpos;
int ch; /* character itself */
int ch_len; /* length of its multibyte sequence */
int ch; /* character at that position, or u+FFFC
("object replacement character") for a run
of characters covered by a display string */
EMACS_INT nchars; /* its "length", usually 1; it's > 1 for a run
of characters covered by a display string */
EMACS_INT ch_len; /* its length in bytes */
bidi_type_t type; /* bidi type of this character, after
resolving weak and neutral types */
bidi_type_t type_after_w1; /* original type, after overrides and W1 */
......@@ -1844,6 +1848,7 @@ struct bidi_it {
bidi_dir_t paragraph_dir; /* current paragraph direction */
int new_paragraph; /* if non-zero, we expect a new paragraph */
EMACS_INT separator_limit; /* where paragraph separator should end */
EMACS_INT disp_pos; /* byte position of display string after ch */
};
/* Value is non-zero when the bidi iterator is at base paragraph
......@@ -3001,6 +3006,7 @@ extern void reseat_at_previous_visible_line_start (struct it *);
extern Lisp_Object lookup_glyphless_char_display (int, struct it *);
extern int calc_pixel_width_or_height (double *, struct it *, Lisp_Object,
struct font *, int, int *);
extern EMACS_INT compute_display_string_pos (EMACS_INT);
#ifdef HAVE_WINDOW_SYSTEM
......
src/xdisp.c
View file @ 182ce2d2
......@@ -3085,6 +3085,20 @@ next_overlay_change (EMACS_INT pos)
return endpos;
}
/* Return the byte position of a display string at or after BYTEPOS.
If no display string exist at or after BYTEPOS, return ZV_BYTE. A
display string is either an overlay with `display' property whose
value is a string or a `display' text property whose value is a
string. */
EMACS_INT
compute_display_string_pos (EMACS_INT bytepos)
{
if (bytepos >= ZV_BYTE)
return ZV_BYTE;
/* FIXME! */
return ZV_BYTE;
}
/***********************************************************************
......@@ -5382,6 +5396,7 @@ reseat_1 (struct it *it, struct text_pos pos, int set_stop_p)
{
it->bidi_it.first_elt = 1;
it->bidi_it.paragraph_dir = NEUTRAL_DIR;
it->bidi_it.disp_pos = -1;
}
if (set_stop_p)
......
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