#ifndef VEGA_TEXT_H
#define VEGA_TEXT_H
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

/* Text as people write it (docs/design/004-text.md): the Unicode properties
 * it needs (tables generated from the UCD by text/unicode.py) and the
 * algorithms over them, checked against Unicode's conformance tests. */

/* Bidi_Class (UAX #9), in the order of text/unicode.py. */
typedef enum {
    VEGA_BIDI_L, VEGA_BIDI_R, VEGA_BIDI_AL, VEGA_BIDI_EN, VEGA_BIDI_ES, VEGA_BIDI_ET, VEGA_BIDI_AN, VEGA_BIDI_CS,
    VEGA_BIDI_NSM, VEGA_BIDI_BN, VEGA_BIDI_B, VEGA_BIDI_S, VEGA_BIDI_WS, VEGA_BIDI_ON, VEGA_BIDI_LRE, VEGA_BIDI_LRO,
    VEGA_BIDI_RLE, VEGA_BIDI_RLO, VEGA_BIDI_PDF, VEGA_BIDI_LRI, VEGA_BIDI_RLI, VEGA_BIDI_FSI, VEGA_BIDI_PDI,
    VEGA_BIDI_CLASSES
} VegaBidiClass;
VegaBidiClass vega_bidi_class(uint32_t code);
/* A paired bracket: 1 opening, 2 closing (its pair in *pair), 0 none. */
int vega_bracket(uint32_t code, uint32_t *pair);
/* The character that mirrors code (Bidi_Mirroring_Glyph), or 0. */
uint32_t vega_mirror(uint32_t code);

/* Canonical_Combining_Class; a code point's full canonical decomposition
 * (0 when it has none; Hangul syllables are left to vega_nfd); the primary
 * composite of two code points, or 0. */
uint8_t vega_combining_class(uint32_t code);
size_t vega_decomposition(uint32_t code, const uint32_t **out);
uint32_t vega_composition(uint32_t first, uint32_t second);
/* Normalization forms D and C (UAX #15): out has room for 4 * count code
 * points (the most one decomposes into); returns how many it holds. */
size_t vega_nfd(const uint32_t *in, size_t count, uint32_t *out);
size_t vega_nfc(const uint32_t *in, size_t count, uint32_t *out);

/* The embedding levels of one paragraph by the Unicode Bidirectional
 * Algorithm (UAX #9, rules P2 to I2), then L1 as for one line: classes are
 * its characters' Bidi_Class; codes, when given, are the characters, so
 * that paired brackets resolve (rule N0); direction is VEGA_BIDI_AUTO (from
 * its first strong character, P2-P3), VEGA_BIDI_LTR or VEGA_BIDI_RTL. Each
 * character's level goes to levels, VEGA_BIDI_REMOVED for those rule X9
 * removes (embedding controls and boundary neutrals). Returns the
 * paragraph's level, or -1 without memory. */
enum { VEGA_BIDI_AUTO = 0, VEGA_BIDI_LTR = 1, VEGA_BIDI_RTL = 2, VEGA_BIDI_REMOVED = 0xff };
int vega_bidi_levels(const VegaBidiClass *classes, const uint32_t *codes, size_t count, int direction, uint8_t *levels);
/* The visual order of one line (rule L2), left to right: the positions of
 * its characters, those removed left out; returns how many. */
size_t vega_bidi_order(const uint8_t *levels, size_t count, uint32_t *order);
#endif