/* $Id: unicode.h,v 1.1.1.1 2001/01/31 03:58:58 zarzycki Exp $ */
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#ifndef MDN_UNICODE_H
#define MDN_UNICODE_H 1

/*
 * Unicode attributes retriever.
 *
 * All the information this module provides is based on UnicodeData.txt,
 * CompositionExclusions-1.txt and SpecialCasing.txt, all of which can be
 * obtained from unicode.org.
 *
 * Unicode characters are represented as 'unsigned long'.
 */

#include <mdn/result.h>

/*
 * Context information for case conversion.
 */
typedef enum {
	mdn__unicode_context_unknown,
	mdn__unicode_context_final,
	mdn__unicode_context_nonfinal
} mdn__unicode_context_t;

/*
 * Get canonical class.
 *
 * For characters out of unicode range (i.e. above 0xffff), 0 will
 * be returned.
 */
extern int
mdn__unicode_canonicalclass(unsigned long c);

/*
 * Decompose a character.
 *
 * Decompose character given by 'c', and put the result into 'v',
 * which can hold 'vlen' characters.  The number of decomposed characters
 * will be stored in '*decomp_lenp'.
 *
 * If 'compat' is true, compatibility decomposition is performed.
 * Otherwise canonical decomposition is done.
 *
 * Since decomposition is done recursively, no further decomposition
 * will be needed.
 *
 * Returns:
 *	mdn_success		-- ok, decomposed.
 *	mdn_notfound		-- no decomposition possible.
 *	mdn_buffer_overflow	-- 'vlen' is too small.
 */
extern mdn_result_t
mdn__unicode_decompose(int compat, unsigned long *v, size_t vlen,
		       unsigned long c, int *decomp_lenp);

/*
 * Perform canonical composition.
 *
 * Do canonical composition to the character sequence 'c1' and 'c2', put the
 * result into '*compp'.
 *
 * Since Unicode Nomalization Froms requires only canonical composition,
 * compatibility composition is not supported.
 *
 * Returns:
 *	mdn_success		-- ok, composed.
 *	mdn_notfound		-- no composition possible.
 */
extern mdn_result_t
mdn__unicode_compose(unsigned long c1, unsigned long c2, unsigned long *compp);

/*
 * Returns if there may be a canonical composition sequence which starts
 * with the given character.
 *
 * Returns:
 *	1			-- there may be a composition sequence
 *				   (maybe not).
 *	0			-- no, there is definitely no such sequences.
 */
extern int
mdn__unicode_iscompositecandidate(unsigned long c);

/*
 * Translate lowercase character to uppercase, and vice versa, according
 * to Unicode Technical Report #21 "Case Mappings".
 *
 * Both functions perform conversion on the given unicode character 'c',
 * put the result into 'v', whose size is specified by 'vlen'.  The actual
 * number of characters stored in 'v' are returned as '*convlenp'.
 * In case 'c' has no mapping, 'v[0]' will contain 'c', and '*convlenp'
 * will be 1.
 *
 * Note that these functions perform locale-independent case conversion.
 *
 * There are some characters whose case mapping depends on the context.
 * 'ctx' specifies the context, which can be obtained by
 * 'mdn__unicode_getcontext'.  Most of the time you can just specify
 * 'mdn__unicode_context_unknown' as 'ctx', and if those functions
 * return 'mdn_context_required', you can get the context using
 * 'mdn__unicode_getcontext' and try again.
 *
 * Returns:
 *	mdn_success		-- successfully converted.
 *	mdn_context_required	-- context information is needed to
 *				   perform case conversion on 'c'.
 *	mdn_buffer_overflow	-- 'vlen' is too small.
 */
extern mdn_result_t
mdn__unicode_toupper(unsigned long c, mdn__unicode_context_t ctx,
		     unsigned long *v, size_t vlen, int *convlenp);
extern mdn_result_t
mdn__unicode_tolower(unsigned long c, mdn__unicode_context_t ctx,
		     unsigned long *v, size_t vlen, int *convlenp);

/*
 * Determine the context needed by the case conversion functions.
 *
 * Case conversion functions above needs context information for some
 * characters.  To get the context, you should call this function with
 * the next character as the parameter.  If you get final or nonfinal,
 * you're done.  If you get unknown, move on to the next character until
 * you get final or nonfinal.
 *
 * Returns:
 *	mdn__unicode_context_final	-- context is 'FINAL'.
 *	mdn__unicode_context_nonfinal	-- context is 'NON_FINAL'.
 *	mdn__unicode_context_unknown	-- context cannot be determined,
 *					   try the next character.
 */
extern mdn__unicode_context_t
mdn__unicode_getcontext(unsigned long c);

#endif
