/*

*******************************************************************************

*

*   Copyright (C) 2002-2005, International Business Machines

*   Corporation and others.  All Rights Reserved.

*

*******************************************************************************

*   file name:  uset.h

*   encoding:   US-ASCII

*   tab size:   8 (not used)

*   indentation:4

*

*   created on: 2002mar07

*   created by: Markus W. Scherer

*

*   C version of UnicodeSet.

*/

/**

 * \file

 * \brief C API: Unicode Set

 *

 * <p>This is a C wrapper around the C++ UnicodeSet class.</p>

 */

#ifndef __USET_H__

#define __USET_H__

#include "unicode/utypes.h"

#include "unicode/uchar.h"

#ifndef UCNV_H

struct USet;

/**

 * A UnicodeSet.  Use the uset_* API to manipulate.  Create with

 * uset_open*, and destroy with uset_close.

 * @stable ICU 2.4

 */

typedef struct USet USet;

#endif

/**

 * Bitmask values to be passed to uset_openPatternOptions() or

 * uset_applyPattern() taking an option parameter.

 * @stable ICU 2.4

 */

enum {

    /**

     * Ignore white space within patterns unless quoted or escaped.

     * @stable ICU 2.4

     */

    USET_IGNORE_SPACE = 1,  

    /**

     * Enable case insensitive matching.  E.g., "[ab]" with this flag

     * will match 'a', 'A', 'b', and 'B'.  "[^ab]" with this flag will

     * match all except 'a', 'A', 'b', and 'B'. This performs a full

     * closure over case mappings, e.g. U+017F for s.

     *

     * The resulting set is a superset of the input for the code points but

     * not for the strings.

     * It performs a case mapping closure of the code points and adds

     * full case folding strings for the code points, and reduces strings of

     * the original set to their full case folding equivalents.

     *

     * This is designed for case-insensitive matches, for example

     * in regular expressions. The full code point case closure allows checking of

     * an input character directly against the closure set.

     * Strings are matched by comparing the case-folded form from the closure

     * set with an incremental case folding of the string in question.

     *

     * The closure set will also contain single code points if the original

     * set contained case-equivalent strings (like U+00DF for "ss" or "Ss" etc.).

     * This is not necessary (that is, redundant) for the above matching method

     * but results in the same closure sets regardless of whether the original

     * set contained the code point or a string.

     *

     * @stable ICU 2.4

     */

    USET_CASE_INSENSITIVE = 2,  

    /**

     * Bitmask for UnicodeSet::closeOver() indicating letter case.

     * This may be ORed together with other selectors.

     * @internal

     */

    USET_CASE = 2,

    /**

     * Enable case insensitive matching.  E.g., "[ab]" with this flag

     * will match 'a', 'A', 'b', and 'B'.  "[^ab]" with this flag will

     * match all except 'a', 'A', 'b', and 'B'. This adds the lower-,

     * title-, and uppercase mappings as well as the case folding

     * of each existing element in the set.

     * @draft ICU 3.2

     */

    USET_ADD_CASE_MAPPINGS = 4,

    /**

     * Enough for any single-code point set

     * @internal

     */

    USET_SERIALIZED_STATIC_ARRAY_CAPACITY=8

};

/**

 * A serialized form of a Unicode set.  Limited manipulations are

 * possible directly on a serialized set.  See below.

 * @stable ICU 2.4

 */

typedef struct USerializedSet {

    /**

     * The serialized Unicode Set.

     * @stable ICU 2.4

     */

    const uint16_t *array;

    /**

     * The length of the array that contains BMP characters.

     * @stable ICU 2.4

     */

    int32_t bmpLength;

    /**

     * The total length of the array.

     * @stable ICU 2.4

     */

    int32_t length;

    /**

     * A small buffer for the array to reduce memory allocations.

     * @stable ICU 2.4

     */

    uint16_t staticArray[USET_SERIALIZED_STATIC_ARRAY_CAPACITY];

} USerializedSet;

/*********************************************************************

 * USet API

 *********************************************************************/

/**

 * Creates a USet object that contains the range of characters

 * start..end, inclusive.

 * @param start first character of the range, inclusive

 * @param end last character of the range, inclusive

 * @return a newly created USet.  The caller must call uset_close() on

 * it when done.

 * @stable ICU 2.4

 */

U_STABLE USet* U_EXPORT2

uset_open(UChar32 start, UChar32 end);

/**

 * Creates a set from the given pattern.  See the UnicodeSet class

 * description for the syntax of the pattern language.

 * @param pattern a string specifying what characters are in the set

 * @param patternLength the length of the pattern, or -1 if null

 * terminated

 * @param ec the error code

 * @stable ICU 2.4

 */

U_STABLE USet* U_EXPORT2

uset_openPattern(const UChar* pattern, int32_t patternLength,

                 UErrorCode* ec);

/**

 * Creates a set from the given pattern.  See the UnicodeSet class

 * description for the syntax of the pattern language.

 * @param pattern a string specifying what characters are in the set

 * @param patternLength the length of the pattern, or -1 if null

 * terminated

 * @param options bitmask for options to apply to the pattern.

 * Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.

 * @param ec the error code

 * @stable ICU 2.4

 */

U_STABLE USet* U_EXPORT2

uset_openPatternOptions(const UChar* pattern, int32_t patternLength,

                 uint32_t options,

                 UErrorCode* ec);

/**

 * Disposes of the storage used by a USet object.  This function should

 * be called exactly once for objects returned by uset_open().

 * @param set the object to dispose of

 * @stable ICU 2.4

 */

U_STABLE void U_EXPORT2

uset_close(USet* set);

/**

 * Causes the USet object to represent the range <code>start - end</code>.

 * If <code>start > end</code> then this USet is set to an empty range.

 * @param set the object to set to the given range

 * @param start first character in the set, inclusive

 * @param end last character in the set, inclusive

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_set(USet* set,

         UChar32 start, UChar32 end);

/**

 * Modifies the set to represent the set specified by the given

 * pattern. See the UnicodeSet class description for the syntax of 

 * the pattern language. See also the User Guide chapter about UnicodeSet.

 * <em>Empties the set passed before applying the pattern.</em>

 * @param set               The set to which the pattern is to be applied. 

 * @param pattern           A pointer to UChar string specifying what characters are in the set.

 *                          The character at pattern[0] must be a '['.

 * @param patternLength     The length of the UChar string. -1 if NUL terminated.

 * @param options           A bitmask for options to apply to the pattern.

 *                          Valid options are USET_IGNORE_SPACE and USET_CASE_INSENSITIVE.

 * @param status            Returns an error if the pattern cannot be parsed.

 * @return                  Upon successful parse, the value is either

 *                          the index of the character after the closing ']' 

 *                          of the parsed pattern.

 *                          If the status code indicates failure, then the return value 

 *                          is the index of the error in the source.

 *                                  

 * @stable ICU 2.8

 */

U_STABLE int32_t U_EXPORT2 

uset_applyPattern(USet *set,

                  const UChar *pattern, int32_t patternLength,

                  uint32_t options,

                  UErrorCode *status);

/**

 * Modifies the set to contain those code points which have the given value

 * for the given binary or enumerated property, as returned by

 * u_getIntPropertyValue.  Prior contents of this set are lost.

 *

 * @param set the object to contain the code points defined by the property

 *

 * @param prop a property in the range UCHAR_BIN_START..UCHAR_BIN_LIMIT-1

 * or UCHAR_INT_START..UCHAR_INT_LIMIT-1

 * or UCHAR_MASK_START..UCHAR_MASK_LIMIT-1.

 *

 * @param value a value in the range u_getIntPropertyMinValue(prop)..

 * u_getIntPropertyMaxValue(prop), with one exception.  If prop is

 * UCHAR_GENERAL_CATEGORY_MASK, then value should not be a UCharCategory, but

 * rather a mask value produced by U_GET_GC_MASK().  This allows grouped

 * categories such as [:L:] to be represented.

 *

 * @param ec error code input/output parameter

 *

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_applyIntPropertyValue(USet* set,

                           UProperty prop, int32_t value, UErrorCode* ec);

/**

 * Modifies the set to contain those code points which have the

 * given value for the given property.  Prior contents of this

 * set are lost.

 *

 * @param set the object to contain the code points defined by the given

 * property and value alias

 *

 * @param prop a string specifying a property alias, either short or long.

 * The name is matched loosely.  See PropertyAliases.txt for names and a

 * description of loose matching.  If the value string is empty, then this

 * string is interpreted as either a General_Category value alias, a Script

 * value alias, a binary property alias, or a special ID.  Special IDs are

 * matched loosely and correspond to the following sets:

 *

 * "ANY" = [\\u0000-\\U0010FFFF],

 * "ASCII" = [\\u0000-\\u007F],

 * "Assigned" = [:^Cn:].

 *

 * @param propLength the length of the prop, or -1 if NULL

 *

 * @param value a string specifying a value alias, either short or long.

 * The name is matched loosely.  See PropertyValueAliases.txt for names

 * and a description of loose matching.  In addition to aliases listed,

 * numeric values and canonical combining classes may be expressed

 * numerically, e.g., ("nv", "0.5") or ("ccc", "220").  The value string

 * may also be empty.

 *

 * @param valueLength the length of the value, or -1 if NULL

 *

 * @param ec error code input/output parameter

 *

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_applyPropertyAlias(USet* set,

                        const UChar *prop, int32_t propLength,

                        const UChar *value, int32_t valueLength,

                        UErrorCode* ec);

/**

 * Return true if the given position, in the given pattern, appears

 * to be the start of a UnicodeSet pattern.

 *

 * @param pattern a string specifying the pattern

 * @param patternLength the length of the pattern, or -1 if NULL

 * @param pos the given position

 * @draft ICU 3.2

 */

U_DRAFT UBool U_EXPORT2

uset_resemblesPattern(const UChar *pattern, int32_t patternLength,

                      int32_t pos);

/**

 * Returns a string representation of this set.  If the result of

 * calling this function is passed to a uset_openPattern(), it

 * will produce another set that is equal to this one.

 * @param set the set

 * @param result the string to receive the rules, may be NULL

 * @param resultCapacity the capacity of result, may be 0 if result is NULL

 * @param escapeUnprintable if TRUE then convert unprintable

 * character to their hex escape representations, \\uxxxx or

 * \\Uxxxxxxxx.  Unprintable characters are those other than

 * U+000A, U+0020..U+007E.

 * @param ec error code.

 * @return length of string, possibly larger than resultCapacity

 * @stable ICU 2.4

 */

U_STABLE int32_t U_EXPORT2

uset_toPattern(const USet* set,

               UChar* result, int32_t resultCapacity,

               UBool escapeUnprintable,

               UErrorCode* ec);

/**

 * Adds the given character to the given USet.  After this call,

 * uset_contains(set, c) will return TRUE.

 * @param set the object to which to add the character

 * @param c the character to add

 * @stable ICU 2.4

 */

U_STABLE void U_EXPORT2

uset_add(USet* set, UChar32 c);

/**

 * Adds all of the elements in the specified set to this set if

 * they're not already present.  This operation effectively

 * modifies this set so that its value is the <i>union</i> of the two

 * sets.  The behavior of this operation is unspecified if the specified

 * collection is modified while the operation is in progress.

 *

 * @param set the object to which to add the set

 * @param additionalSet the source set whose elements are to be added to this set.

 * @stable ICU 2.6

 */

U_STABLE void U_EXPORT2

uset_addAll(USet* set, const USet *additionalSet);

/**

 * Adds the given range of characters to the given USet.  After this call,

 * uset_contains(set, start, end) will return TRUE.

 * @param set the object to which to add the character

 * @param start the first character of the range to add, inclusive

 * @param end the last character of the range to add, inclusive

 * @stable ICU 2.2

 */

U_STABLE void U_EXPORT2

uset_addRange(USet* set, UChar32 start, UChar32 end);

/**

 * Adds the given string to the given USet.  After this call,

 * uset_containsString(set, str, strLen) will return TRUE.

 * @param set the object to which to add the character

 * @param str the string to add

 * @param strLen the length of the string or -1 if null terminated.

 * @stable ICU 2.4

 */

U_STABLE void U_EXPORT2

uset_addString(USet* set, const UChar* str, int32_t strLen);

/**

 * Adds each of the characters in this string to the set. Thus "ch" => {"c", "h"}

 * If this set already any particular character, it has no effect on that character.

 * @param set the object to which to add the character

 * @param str the source string

 * @param strLen the length of the string or -1 if null terminated.

 * @draft ICU 3.4

 */

U_DRAFT void U_EXPORT2

uset_addAllCodePoints(USet* set, const UChar *str, int32_t strLen);

/**

 * Removes the given character from the given USet.  After this call,

 * uset_contains(set, c) will return FALSE.

 * @param set the object from which to remove the character

 * @param c the character to remove

 * @stable ICU 2.4

 */

U_STABLE void U_EXPORT2

uset_remove(USet* set, UChar32 c);

/**

 * Removes the given range of characters from the given USet.  After this call,

 * uset_contains(set, start, end) will return FALSE.

 * @param set the object to which to add the character

 * @param start the first character of the range to remove, inclusive

 * @param end the last character of the range to remove, inclusive

 * @stable ICU 2.2

 */

U_STABLE void U_EXPORT2

uset_removeRange(USet* set, UChar32 start, UChar32 end);

/**

 * Removes the given string to the given USet.  After this call,

 * uset_containsString(set, str, strLen) will return FALSE.

 * @param set the object to which to add the character

 * @param str the string to remove

 * @param strLen the length of the string or -1 if null terminated.

 * @stable ICU 2.4

 */

U_STABLE void U_EXPORT2

uset_removeString(USet* set, const UChar* str, int32_t strLen);

/**

 * Removes from this set all of its elements that are contained in the

 * specified set.  This operation effectively modifies this

 * set so that its value is the <i>asymmetric set difference</i> of

 * the two sets.

 * @param set the object from which the elements are to be removed

 * @param removeSet the object that defines which elements will be

 * removed from this set

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_removeAll(USet* set, const USet* removeSet);

/**

 * Retain only the elements in this set that are contained in the

 * specified range.  If <code>start > end</code> then an empty range is

 * retained, leaving the set empty.  This is equivalent to

 * a boolean logic AND, or a set INTERSECTION.

 *

 * @param set the object for which to retain only the specified range

 * @param start first character, inclusive, of range to be retained

 * to this set.

 * @param end last character, inclusive, of range to be retained

 * to this set.

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_retain(USet* set, UChar32 start, UChar32 end);

/**

 * Retains only the elements in this set that are contained in the

 * specified set.  In other words, removes from this set all of

 * its elements that are not contained in the specified set.  This

 * operation effectively modifies this set so that its value is

 * the <i>intersection</i> of the two sets.

 *

 * @param set the object on which to perform the retain

 * @param retain set that defines which elements this set will retain

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_retainAll(USet* set, const USet* retain);

/**

 * Reallocate this objects internal structures to take up the least

 * possible space, without changing this object's value.

 *

 * @param set the object on which to perfrom the compact

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_compact(USet* set);

/**

 * Inverts this set.  This operation modifies this set so that

 * its value is its complement.  This operation does not affect

 * the multicharacter strings, if any.

 * @param set the set

 * @stable ICU 2.4

 */

U_STABLE void U_EXPORT2

uset_complement(USet* set);

/**

 * Complements in this set all elements contained in the specified

 * set.  Any character in the other set will be removed if it is

 * in this set, or will be added if it is not in this set.

 *

 * @param set the set with which to complement

 * @param complement set that defines which elements will be xor'ed

 * from this set.

 * @draft ICU 3.2

 */

U_DRAFT void U_EXPORT2

uset_complementAll(USet* set, const USet* complement);

/**

 * Removes all of the elements from this set.  This set will be

 * empty after this call returns.

 * @param set the set

 * @stable ICU 2.4

 */

U_STABLE void U_EXPORT2

uset_clear(USet* set);

/**

 * Returns TRUE if the given USet contains no characters and no

 * strings.

 * @param set the set

 * @return true if set is empty

 * @stable ICU 2.4

 */

U_STABLE UBool U_EXPORT2

uset_isEmpty(const USet* set);

/**

 * Returns TRUE if the given USet contains the given character.

 * @param set the set

 * @param c The codepoint to check for within the set

 * @return true if set contains c

 * @stable ICU 2.4

 */

U_STABLE UBool U_EXPORT2

uset_contains(const USet* set, UChar32 c);

/**

 * Returns TRUE if the given USet contains all characters c

 * where start <= c && c <= end.

 * @param set the set

 * @param start the first character of the range to test, inclusive

 * @param end the last character of the range to test, inclusive

 * @return TRUE if set contains the range

 * @stable ICU 2.2

 */