251f5e605f
- Version bump to 1.8 necessary for "unaccent" functionality - Qt now depends on nunicode, ruling out use of precompiled binaries
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
#include <assert.h>
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#include <libnu/ducet.h>
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#include <libnu/udb.h>
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#ifdef NU_WITH_DUCET
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#include "gen/_ducet.c"
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#ifndef NU_DISABLE_CONTRACTIONS
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# include "gen/_ducet_switch.c"
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#else
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const size_t _NU_DUCET_CONTRACTIONS = 0;
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#endif
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static size_t _nu_ducet_weights_count() {
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return NU_DUCET_G_SIZE + _NU_DUCET_CONTRACTIONS;
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}
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int32_t nu_ducet_weight(uint32_t codepoint, int32_t *weight, void *context) {
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(void)(weight);
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(void)(context);
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assert(_nu_ducet_weights_count() < 0x7FFFFFFF - 0x10FFFF);
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#ifndef NU_DISABLE_CONTRACTIONS
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int32_t switch_value = _nu_ducet_weight_switch(codepoint, weight, context);
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/* weight switch should return weight (if any) and fill value of *weight
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* with fallback (if needed). returned value of 0 is impossible result - this
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* special case is already handled above, this return value indicates that switch
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* couldn't find weight for a codepoint */
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if (switch_value != 0) {
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return switch_value;
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}
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#endif
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/* special case switch after contractions switch
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* to let state-machine figure out its state on abort */
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if (codepoint == 0) {
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return 0;
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}
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uint32_t mph_value = nu_udb_lookup_value(codepoint, NU_DUCET_G, NU_DUCET_G_SIZE,
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NU_DUCET_VALUES_C, NU_DUCET_VALUES_I);
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return (mph_value != 0
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? (int32_t)(mph_value)
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: (int32_t)(codepoint + _nu_ducet_weights_count()));
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/* ISO/IEC 14651 requests that codepoints with undefined weight should be
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* sorted before max weight in collation table. This way all codepoints
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* defined in ducet would have weight under a value of _nu_ducet_weights_count(),
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* all undefined codepoints would have weight under
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* 0x10FFFF + _nu_ducet_weights_count() - 1, max weight will be
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* 0x10FFFF + _nu_ducet_weights_count() */
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/* Regarding integer overflow:
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*
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* int32_t can hold 0xFFFFFFFF / 2 = 0x7FFFFFFF positive numbers, this
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* function can safely offset codepoint value up to +2146369536 without
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* risk of overflow. Thus max collation table size supported is
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* 2146369536 (0x7FFFFFFF - 0x10FFFF) */
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}
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#endif /* NU_WITH_DUCET */
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