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Cherry-pick a fix from trunk; fix level handling in bidi_resolve_brackets.

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This commit is contained in:
Eli Zaretskii 2014-10-16 16:18:00 +03:00
parent b8ec977659
commit e23e97d504
1 changed files with 47 additions and 13 deletions
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60
src/bidi.c
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@ -2450,7 +2450,7 @@ bidi_find_bracket_pairs (struct bidi_it *bidi_it)
}
else if (bidi_get_category (bidi_it->type_after_wn) != NEUTRAL)
{
unsigned flag;
unsigned flag = 0;
int sp;
/* Whenever we see a strong type, update the flags of
@ -2472,8 +2472,11 @@ bidi_find_bracket_pairs (struct bidi_it *bidi_it)
default:
break;
}
for (sp = bpa_sp; sp >= 0; sp--)
bpa_stack[sp].flags |= flag;
if (flag)
{
for (sp = bpa_sp; sp >= 0; sp--)
bpa_stack[sp].flags |= flag;
}
}
old_sidx = bidi_it->stack_idx;
type = bidi_resolve_weak (bidi_it);
@ -2517,6 +2520,27 @@ bidi_find_bracket_pairs (struct bidi_it *bidi_it)
return retval;
}
static void
bidi_record_prev_for_neutral (struct bidi_saved_info *info, int level)
{
int idx;
for (idx = bidi_cache_last_idx + 1; idx < bidi_cache_idx; idx++)
{
int lev = bidi_cache[idx].level_stack[bidi_cache[idx].stack_idx].level;
if (bidi_cache[idx].type_after_wn == NEUTRAL_B)
return; /* no cache slot to update */
if (lev <= level)
{
eassert (lev == level);
bidi_cache[idx].prev_for_neutral = *info;
break;
}
}
eassert (idx < bidi_cache_idx);
}
static bidi_type_t
bidi_resolve_brackets (struct bidi_it *bidi_it)
{
@ -2526,7 +2550,14 @@ bidi_resolve_brackets (struct bidi_it *bidi_it)
int ch;
struct bidi_saved_info tem_info;
bidi_remember_char (&tem_info, bidi_it, 1);
/* Record the prev_for_neutral type either from the previous
character, if it was a strong or AN/EN, or from the
prev_for_neutral information recvorded previously. */
if (bidi_it->type == STRONG_L || bidi_it->type == STRONG_R
|| bidi_it->type == WEAK_AN || bidi_it->type == WEAK_EN)
bidi_remember_char (&tem_info, bidi_it, 1);
else
tem_info = bidi_it->prev_for_neutral;
if (!bidi_it->first_elt)
{
type = bidi_cache_find (bidi_it->charpos + bidi_it->nchars, 1, bidi_it);
@ -2540,10 +2571,18 @@ bidi_resolve_brackets (struct bidi_it *bidi_it)
}
else
{
/* If the cached state shows an increase of embedding level due
to an isolate initiator, we need to update the 1st cached
state of the next run of the current isolating sequence with
the prev_for_neutral information, so that it will be picked
up when we advanced to that next run. */
if (bidi_it->level_stack[bidi_it->stack_idx].level > prev_level
&& bidi_it->level_stack[bidi_it->stack_idx].isolate_status)
bidi_record_prev_for_neutral (&tem_info, prev_level);
if (type == NEUTRAL_ON
&& bidi_paired_bracket_type (ch) == BIDI_BRACKET_OPEN)
{
if (bidi_it->level_stack[bidi_it->stack_idx].level == prev_level)
if (bidi_it->level_stack[bidi_it->stack_idx].level <= prev_level)
{
if (bidi_it->bracket_pairing_pos > 0)
{
@ -2555,20 +2594,15 @@ bidi_resolve_brackets (struct bidi_it *bidi_it)
else
{
/* Higher levels were not BPA-resolved yet, even if
cached by bidi_find_bracket_pairs. Lower levels were
probably processed by bidi_find_bracket_pairs, but we
have no easy way of retaining the prev_for_neutral
from the previous level run of the isolating
sequence. Force application of BPA now. */
cached by bidi_find_bracket_pairs. Force application
of BPA to the new level now. */
if (bidi_find_bracket_pairs (bidi_it))
resolve_bracket = true;
}
}
/* Keep track of the prev_for_neutral type, needed for resolving
brackets below and for resolving neutrals in bidi_resolve_neutral. */
if (bidi_it->level_stack[bidi_it->stack_idx].level == prev_level
&& (tem_info.type == STRONG_L || tem_info.type == STRONG_R
|| tem_info.type == WEAK_AN || tem_info.type == WEAK_EN))
if (bidi_it->level_stack[bidi_it->stack_idx].level == prev_level)
bidi_it->prev_for_neutral = tem_info;
}