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Add support for canonically equivalent bracket characters.

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This commit is contained in:
Eli Zaretskii 2014-10-18 14:07:44 +03:00
parent 1c39638499
commit b5e71861a3
1 changed files with 48 additions and 11 deletions
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59
src/bidi.c
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@ -2338,6 +2338,41 @@ typedef struct bpa_stack_entry {
BPA stack, which should be more than enough for actual bidi text. */
#define MAX_BPA_STACK (max (MAX_ALLOCA / sizeof (bpa_stack_entry), 1))
/* UAX#9 says to match opening brackets with the matching closing
brackets or their canonical equivalents. As of Unicode 7.0, there
are only 2 bracket characters that have canonical equivalence
decompositions: u+2329 and u+232A. So instead of accessing the
table in uni-decomposition.el, we just handle these 2 characters
with this simple macro. Note that ASCII characters don't have
canonical equivalents by definition. */
/* To find all the characters that need to be processed by
CANONICAL_EQU, first find all the characters which have
decompositions in UnicodeData.txt, with this Awk script:
awk -F ";" " {if ($6 != \"\") print $1, $6}" UnicodeData.txt
Then produce a list of all the bracket characters in BidiBrackets.txt:
awk -F "[ ;]" " {if ($1 != \"#\" && $1 != \"\") print $1}" BidiBrackets.txt
And finally, cross-reference these two:
fgrep -w -f brackets.txt decompositions.txt
where "decompositions.txt" was produced by the 1st script, and
"brackets.txt" by the 2nd script. In the output of fgrep, look
only for decompositions that don't begin with some compatibility
formatting tag, such as "<compat>". Only decompositions that
consist solely of character codepoints are relevant to bidi
brackets processing. */
#define CANONICAL_EQU(c) \
( ASCII_CHAR_P (c) ? c \
: (c) == 0x2329 ? 0x3008 \
: (c) == 0x232a ? 0x3009 \
: c )
#ifdef ENABLE_CHECKING
# define STORE_BRACKET_CHARPOS \
bpa_stack[bpa_sp].open_bracket_pos = bidi_it->charpos
@ -2347,16 +2382,18 @@ typedef struct bpa_stack_entry {
#define PUSH_BPA_STACK \
do { \
bpa_sp++; \
if (bpa_sp >= MAX_BPA_STACK) \
{ \
bpa_sp = MAX_BPA_STACK - 1; \
goto bpa_give_up; \
} \
bpa_stack[bpa_sp].close_bracket_char = bidi_mirror_char (bidi_it->ch); \
bpa_stack[bpa_sp].open_bracket_idx = bidi_cache_last_idx; \
bpa_stack[bpa_sp].flags = 0; \
STORE_BRACKET_CHARPOS; \
int ch; \
bpa_sp++; \
if (bpa_sp >= MAX_BPA_STACK) \
{ \
bpa_sp = MAX_BPA_STACK - 1; \
goto bpa_give_up; \
} \
ch = CANONICAL_EQU (bidi_it->ch); \
bpa_stack[bpa_sp].close_bracket_char = bidi_mirror_char (ch); \
bpa_stack[bpa_sp].open_bracket_idx = bidi_cache_last_idx; \
bpa_stack[bpa_sp].flags = 0; \
STORE_BRACKET_CHARPOS; \
} while (0)
@ -2416,7 +2453,7 @@ bidi_find_bracket_pairs (struct bidi_it *bidi_it)
else if (btype == BIDI_BRACKET_CLOSE)
{
int sp = bpa_sp;
int curchar = bidi_it->ch;
int curchar = CANONICAL_EQU (bidi_it->ch);
eassert (sp >= 0);
while (sp >= 0 && bpa_stack[sp].close_bracket_char != curchar)