return (size_t)(t - s);
}
+/** @brief Return the @ref unidata structure for code point @p c
+ *
+ * @p c can be any 32-bit value, a sensible value will be returned regardless.
+ */
+static const struct unidata *utf32__unidata(uint32_t c) {
+ /* The bottom half of the table contains almost everything of interest
+ * and we can just return the right thing straight away */
+ if(c < UNICODE_BREAK_START)
+ return &unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS];
+ /* Within the break everything is unassigned */
+ if(c < UNICODE_BREAK_END)
+ return utf32__unidata(0xFFFF); /* guaranteed to be Cn */
+ /* Planes 15 and 16 are (mostly) private use */
+ if((c >= 0xF0000 && c <= 0xFFFFD)
+ || (c >= 0x100000 && c <= 0x10FFFD))
+ return utf32__unidata(0xE000); /* first Co code point */
+ /* Everything else above the break top is unassigned */
+ if(c >= UNICODE_BREAK_TOP)
+ return utf32__unidata(0xFFFF); /* guaranteed to be Cn */
+ /* Currently the rest is language tags and variation selectors */
+ c -= (UNICODE_BREAK_END - UNICODE_BREAK_START);
+ return &unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS];
+}
+
/** @brief Return the combining class of @p c
* @param c Code point
* @return Combining class of @p c
*/
static inline int utf32__combining_class(uint32_t c) {
- if(c < UNICODE_NCHARS)
- return unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS].ccc;
- return 0;
+ return utf32__unidata(c)->ccc;
}
/** @brief Stably sort [s,s+ns) into descending order of combining class
/** @brief Guts of the decomposition lookup functions */
#define utf32__decompose_one_generic(WHICH) do { \
- const uint32_t *dc = \
- (c < UNICODE_NCHARS \
- ? unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS].WHICH \
- : 0); \
+ const uint32_t *dc = utf32__unidata(c)->WHICH; \
if(dc) { \
/* Found a canonical decomposition in the table */ \
while(*dc) \
/** @brief Single-character case-fold and decompose operation */
#define utf32__casefold_one(WHICH) do { \
- const uint32_t *cf = \
- (c < UNICODE_NCHARS \
- ? unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS].casefold \
- : 0); \
+ const uint32_t *cf = utf32__unidata(c)->casefold; \
if(cf) { \
/* Found a case-fold mapping in the table */ \
while(*cf) \
* normalize before we fold. In Unicode 5.0.0 this means 0345 COMBINING
* GREEK YPOGEGRAMMENI in its decomposition and the various characters that
* canonically decompose to it. */
- for(n = 0; n < ns; ++n) {
- c = s[n];
- if(c < UNICODE_NCHARS
- && (unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS].flags
- & unicode_normalize_before_casefold))
+ for(n = 0; n < ns; ++n)
+ if(utf32__unidata(s[n])->flags & unicode_normalize_before_casefold)
break;
- }
if(n < ns) {
/* We need a preliminary decomposition */
if(!(ss = utf32_decompose_canon(s, ns, &ns)))
size_t n;
uint32_t *ss = 0;
- for(n = 0; n < ns; ++n) {
- c = s[n];
- if(c < UNICODE_NCHARS
- && (unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS].flags
- & unicode_normalize_before_casefold))
+ for(n = 0; n < ns; ++n)
+ if(utf32__unidata(s[n])->flags & unicode_normalize_before_casefold)
break;
- }
if(n < ns) {
/* We need a preliminary _canonical_ decomposition */
if(!(ss = utf32_decompose_canon(s, ns, &ns)))
* @param Code point
* @return General_Category property value
*/
-static inline enum unicode_gc_cat utf32__general_category(uint32_t c) {
- if(c < UNICODE_NCHARS) {
- const struct unidata *const ud = &unidata[c / UNICODE_MODULUS][c % UNICODE_MODULUS];
- return ud->gc;
- } else
- return unicode_gc_Cn;
+static inline enum unicode_General_Category utf32__general_category(uint32_t c) {
+ return utf32__unidata(c)->general_category;
}
-/** @brief Check Grapheme_Cluster_Break property
+/** @brief Determine Grapheme_Break property
* @param c Code point
- * @return 0 if it is as described, 1 otherwise
+ * @return Grapheme_Break property value of @p c
*/
-static int utf32__is_control_or_cr_or_lf(uint32_t c) {
- switch(utf32__general_category(c)) {
- default:
- return 0;
- case unicode_gc_Zl:
- case unicode_gc_Zp:
- case unicode_gc_Cc:
- return 1;
- case unicode_gc_Cf:
- if(c == 0x200C || c == 0x200D)
- return 0;
- return 1;
- }
+static enum unicode_Grapheme_Break utf32__grapheme_break(uint32_t c) {
+ return utf32__unidata(c)->grapheme_break;
}
-#define Hangul_Syllable_Type_NA 0
-#define Hangul_Syllable_Type_L 0x1100
-#define Hangul_Syllable_Type_V 0x1160
-#define Hangul_Syllable_Type_T 0x11A8
-#define Hangul_Syllable_Type_LV 0xAC00
-#define Hangul_Syllable_Type_LVT 0xAC01
-
-/** @brief Determine Hangul_Syllable_Type of @p c
+/** @brief Determine Word_Break property
* @param c Code point
- * @return Equivalance class of @p c, or Hangul_Syllable_Type_NA
- *
- * If this is a Hangul character then a representative member of its
- * equivalence class is returned. Otherwise Hangul_Syllable_Type_NA is
- * returned.
+ * @return Word_Break property value of @p c
*/
-static uint32_t utf32__hangul_syllable_type(uint32_t c) {
- /* Dispose of the bulk of the non-Hangul code points first */
- if(c < 0x1100) return Hangul_Syllable_Type_NA;
- if(c > 0x1200 && c < 0xAC00) return Hangul_Syllable_Type_NA;
- if(c >= 0xD800) return Hangul_Syllable_Type_NA;
- /* Now we pick out the assigned Hangul code points */
- if((c >= 0x1100 && c <= 0x1159) || c == 0x115F) return Hangul_Syllable_Type_L;
- if(c >= 0x1160 && c <= 0x11A2) return Hangul_Syllable_Type_V;
- if(c >= 0x11A8 && c <= 0x11F9) return Hangul_Syllable_Type_T;
- if(c >= 0xAC00 && c <= 0xD7A3) {
- if(c % 28 == 16)
- return Hangul_Syllable_Type_LV;
- else
- return Hangul_Syllable_Type_LVT;
- }
- return Hangul_Syllable_Type_NA;
+static enum unicode_Word_Break utf32__word_break(uint32_t c) {
+ return utf32__unidata(c)->word_break;
}
/** @brief Identify a grapheme cluster boundary
* UAX #29 s3. It returns 1 if @p n points at the code point just after a
* grapheme cluster boundary (including the hypothetical code point just after
* the end of the string).
- *
- * The string must be in NFD (or NFKD) for this function to work (currently).
*/
-int utf32_is_gcb(const uint32_t *s, size_t ns, size_t n) {
+int utf32_is_grapheme_boundary(const uint32_t *s, size_t ns, size_t n) {
uint32_t before, after;
- uint32_t hbefore, hafter;
+ enum unicode_Grapheme_Break gbbefore, gbafter;
/* GB1 and GB2 */
if(n == 0 || n == ns)
return 1;
after = s[n];
if(before == 0x000D && after == 0x000A)
return 0;
- /* GB4 and GB5 */
- if(utf32__is_control_or_cr_or_lf(before)
- || utf32__is_control_or_cr_or_lf(after))
+ gbbefore = utf32__grapheme_break(before);
+ gbafter = utf32__grapheme_break(after);
+ /* GB4 */
+ if(gbbefore == unicode_Grapheme_Break_Control
+ || before == 0x000D
+ || before == 0x000A)
+ return 1;
+ /* GB5 */
+ if(gbafter == unicode_Grapheme_Break_Control
+ || after == 0x000D
+ || after == 0x000A)
return 1;
- hbefore = utf32__hangul_syllable_type(before);
- hafter = utf32__hangul_syllable_type(after);
/* GB6 */
- if(hbefore == Hangul_Syllable_Type_L
- && (hafter == Hangul_Syllable_Type_L
- || hafter == Hangul_Syllable_Type_V
- || hafter == Hangul_Syllable_Type_LV
- || hafter == Hangul_Syllable_Type_LVT))
+ if(gbbefore == unicode_Grapheme_Break_L
+ && (gbafter == unicode_Grapheme_Break_L
+ || gbafter == unicode_Grapheme_Break_V
+ || gbafter == unicode_Grapheme_Break_LV
+ || gbafter == unicode_Grapheme_Break_LVT))
return 0;
/* GB7 */
- if((hbefore == Hangul_Syllable_Type_LV
- || hbefore == Hangul_Syllable_Type_V)
- && (hafter == Hangul_Syllable_Type_V
- || hafter == Hangul_Syllable_Type_T))
+ if((gbbefore == unicode_Grapheme_Break_LV
+ || gbbefore == unicode_Grapheme_Break_V)
+ && (gbafter == unicode_Grapheme_Break_V
+ || gbafter == unicode_Grapheme_Break_T))
return 0;
/* GB8 */
- if((hbefore == Hangul_Syllable_Type_LVT
- || hbefore == Hangul_Syllable_Type_T)
- && hafter == Hangul_Syllable_Type_T)
+ if((gbbefore == unicode_Grapheme_Break_LVT
+ || gbbefore == unicode_Grapheme_Break_T)
+ && gbafter == unicode_Grapheme_Break_T)
return 0;
/* GB9 */
- if(after < UNICODE_NCHARS
- && (unidata[after / UNICODE_MODULUS][after % UNICODE_MODULUS].flags
- & unicode_grapheme_break_extend))
+ if(utf32__word_break(after) == unicode_Word_Break_Extend)
return 0;
/* GB10 */
return 1;
}
+/** @brief Return true if @p c is ignorable for boundary specifications */
+static inline int utf32__boundary_ignorable(enum unicode_Word_Break wb) {
+ return (wb == unicode_Word_Break_Extend
+ || wb == unicode_Word_Break_Format);
+}
+
+/** @brief Identify a word boundary
+ * @param s Start of string (must be NFD)
+ * @param ns Length of string
+ * @param n Index within string (in [0,ns].)
+ * @return 1 at a word boundary, 0 otherwise
+ *
+ * This function identifies default word boundaries as described in UAX #29 s4.
+ * It returns 1 if @p n points at the code point just after a word boundary
+ * (including the hypothetical code point just after the end of the string).
+ */
+int utf32_is_word_boundary(const uint32_t *s, size_t ns, size_t n) {
+ enum unicode_Word_Break twobefore, before, after, twoafter;
+ size_t nn;
+
+ /* WB1 and WB2 */
+ if(n == 0 || n == ns)
+ return 1;
+ /* WB3 */
+ if(s[n-1] == 0x000D && s[n] == 0x000A)
+ return 0;
+ /* WB4 */
+ /* (!Sep) x (Extend|Format) as in UAX #29 s6.2 */
+ switch(s[n-1]) { /* bit of a bodge */
+ case 0x000A:
+ case 0x000D:
+ case 0x0085:
+ case 0x2028:
+ case 0x2029:
+ break;
+ default:
+ if(utf32__boundary_ignorable(utf32__word_break(s[n])))
+ return 0;
+ break;
+ }
+ /* Gather the property values we'll need for the rest of the test taking the
+ * s6.2 changes into account */
+ /* First we look at the code points after the proposed boundary */
+ nn = n; /* <ns */
+ after = utf32__word_break(s[nn++]);
+ if(!utf32__boundary_ignorable(after)) {
+ /* X (Extend|Format)* -> X */
+ while(nn < ns && utf32__boundary_ignorable(utf32__word_break(s[nn])))
+ ++nn;
+ }
+ /* It's possible now that nn=ns */
+ if(nn < ns)
+ twoafter = utf32__word_break(s[nn]);
+ else
+ twoafter = unicode_Word_Break_Other;
+
+ /* Next we look at the code points before the proposed boundary. This is a
+ * bit fiddlier. */
+ nn = n;
+ while(nn > 0 && utf32__boundary_ignorable(utf32__word_break(s[nn - 1])))
+ --nn;
+ if(nn == 0) {
+ /* s[nn] must be ignorable */
+ before = utf32__word_break(s[nn]);
+ twobefore = unicode_Word_Break_Other;
+ } else {
+ /* s[nn] is ignorable or after the proposed boundary; but s[nn-1] is not
+ * ignorable. */
+ before = utf32__word_break(s[nn - 1]);
+ --nn;
+ /* Repeat the exercise */
+ while(nn > 0 && utf32__boundary_ignorable(utf32__word_break(s[nn - 1])))
+ --nn;
+ if(nn == 0)
+ twobefore = utf32__word_break(s[nn]);
+ else
+ twobefore = utf32__word_break(s[nn - 1]);
+ }
+
+ /* WB5 */
+ if(before == unicode_Word_Break_ALetter
+ && after == unicode_Word_Break_ALetter)
+ return 0;
+ /* WB6 */
+ if(before == unicode_Word_Break_ALetter
+ && after == unicode_Word_Break_MidLetter
+ && twoafter == unicode_Word_Break_ALetter)
+ return 0;
+ /* WB7 */
+ if(twobefore == unicode_Word_Break_ALetter
+ && before == unicode_Word_Break_MidLetter
+ && after == unicode_Word_Break_ALetter)
+ return 0;
+ /* WB8 */
+ if(before == unicode_Word_Break_Numeric
+ && after == unicode_Word_Break_Numeric)
+ return 0;
+ /* WB9 */
+ if(before == unicode_Word_Break_ALetter
+ && after == unicode_Word_Break_Numeric)
+ return 0;
+ /* WB10 */
+ if(before == unicode_Word_Break_Numeric
+ && after == unicode_Word_Break_ALetter)
+ return 0;
+ /* WB11 */
+ if(twobefore == unicode_Word_Break_Numeric
+ && before == unicode_Word_Break_MidNum
+ && after == unicode_Word_Break_Numeric)
+ return 0;
+ /* WB12 */
+ if(before == unicode_Word_Break_Numeric
+ && after == unicode_Word_Break_MidNum
+ && twoafter == unicode_Word_Break_Numeric)
+ return 0;
+ /* WB13 */
+ if(before == unicode_Word_Break_Katakana
+ && after == unicode_Word_Break_Katakana)
+ return 0;
+ /* WB13a */
+ if((before == unicode_Word_Break_ALetter
+ || before == unicode_Word_Break_Numeric
+ || before == unicode_Word_Break_Katakana
+ || before == unicode_Word_Break_ExtendNumLet)
+ && after == unicode_Word_Break_ExtendNumLet)
+ return 0;
+ /* WB13b */
+ if(before == unicode_Word_Break_ExtendNumLet
+ && (after == unicode_Word_Break_ALetter
+ || after == unicode_Word_Break_Numeric
+ || after == unicode_Word_Break_Katakana))
+ return 0;
+ /* WB14 */
+ return 1;
+}
+
/*@}*/
-/** @defgroup Functions that operate on UTF-8 strings */
+/** @defgroup utf8 Functions that operate on UTF-8 strings */
/*@{*/
/** @brief Wrapper to transform a UTF-8 string using the UTF-32 function */
~mdw / disorder / blobdiff