Move ICU headers from public/{common,i18n} to source/{common,i18n}

public/common/unicode/normalizer2.h

-/*
-*******************************************************************************
-*
-*   Copyright (C) 2009-2010, International Business Machines
-*   Corporation and others.  All Rights Reserved.
-*
-*******************************************************************************
-*   file name:  normalizer2.h
-*   encoding:   US-ASCII
-*   tab size:   8 (not used)
-*   indentation:4
-*
-*   created on: 2009nov22
-*   created by: Markus W. Scherer
-*/
-
-#ifndef __NORMALIZER2_H__
-#define __NORMALIZER2_H__
-
-/**
- * \file
- * \brief C++ API: New API for Unicode Normalization.
- */
-
-#include "unicode/utypes.h"
-
-#if !UCONFIG_NO_NORMALIZATION
-
-#include "unicode/uniset.h"
-#include "unicode/unistr.h"
-#include "unicode/unorm2.h"
-
-U_NAMESPACE_BEGIN
-
-/**
- * Unicode normalization functionality for standard Unicode normalization or
- * for using custom mapping tables.
- * All instances of this class are unmodifiable/immutable.
- * Instances returned by getInstance() are singletons that must not be deleted by the caller.
- * The Normalizer2 class is not intended for public subclassing.
- *
- * The primary functions are to produce a normalized string and to detect whether
- * a string is already normalized.
- * The most commonly used normalization forms are those defined in
- * http://www.unicode.org/unicode/reports/tr15/
- * However, this API supports additional normalization forms for specialized purposes.
- * For example, NFKC_Casefold is provided via getInstance("nfkc_cf", COMPOSE)
- * and can be used in implementations of UTS #46.
- *
- * Not only are the standard compose and decompose modes supplied,
- * but additional modes are provided as documented in the Mode enum.
- *
- * Some of the functions in this class identify normalization boundaries.
- * At a normalization boundary, the portions of the string
- * before it and starting from it do not interact and can be handled independently.
- *
- * The spanQuickCheckYes() stops at a normalization boundary.
- * When the goal is a normalized string, then the text before the boundary
- * can be copied, and the remainder can be processed with normalizeSecondAndAppend().
- *
- * The hasBoundaryBefore(), hasBoundaryAfter() and isInert() functions test whether
- * a character is guaranteed to be at a normalization boundary,
- * regardless of context.
- * This is used for moving from one normalization boundary to the next
- * or preceding boundary, and for performing iterative normalization.
- *
- * Iterative normalization is useful when only a small portion of a
- * longer string needs to be processed.
- * For example, in ICU, iterative normalization is used by the NormalizationTransliterator
- * (to avoid replacing already-normalized text) and ucol_nextSortKeyPart()
- * (to process only the substring for which sort key bytes are computed).
- *
- * The set of normalization boundaries returned by these functions may not be
- * complete: There may be more boundaries that could be returned.
- * Different functions may return different boundaries.
- * @stable ICU 4.4
- */
-class U_COMMON_API Normalizer2 : public UObject {
-public:
-    /**
-     * Returns a Normalizer2 instance which uses the specified data file
-     * (packageName/name similar to ucnv_openPackage() and ures_open()/ResourceBundle)
-     * and which composes or decomposes text according to the specified mode.
-     * Returns an unmodifiable singleton instance. Do not delete it.
-     *
-     * Use packageName=NULL for data files that are part of ICU's own data.
-     * Use name="nfc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFC/NFD.
-     * Use name="nfkc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFKC/NFKD.
-     * Use name="nfkc_cf" and UNORM2_COMPOSE for Unicode standard NFKC_CF=NFKC_Casefold.
-     *
-     * @param packageName NULL for ICU built-in data, otherwise application data package name
-     * @param name "nfc" or "nfkc" or "nfkc_cf" or name of custom data file
-     * @param mode normalization mode (compose or decompose etc.)
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return the requested Normalizer2, if successful
-     * @stable ICU 4.4
-     */
-    static const Normalizer2 *
-    getInstance(const char *packageName,
-                const char *name,
-                UNormalization2Mode mode,
-                UErrorCode &errorCode);
-
-    /**
-     * Returns the normalized form of the source string.
-     * @param src source string
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return normalized src
-     * @stable ICU 4.4
-     */
-    UnicodeString
-    normalize(const UnicodeString &src, UErrorCode &errorCode) const {
-        UnicodeString result;
-        normalize(src, result, errorCode);
-        return result;
-    }
-    /**
-     * Writes the normalized form of the source string to the destination string
-     * (replacing its contents) and returns the destination string.
-     * The source and destination strings must be different objects.
-     * @param src source string
-     * @param dest destination string; its contents is replaced with normalized src
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return dest
-     * @stable ICU 4.4
-     */
-    virtual UnicodeString &
-    normalize(const UnicodeString &src,
-              UnicodeString &dest,
-              UErrorCode &errorCode) const = 0;
-    /**
-     * Appends the normalized form of the second string to the first string
-     * (merging them at the boundary) and returns the first string.
-     * The result is normalized if the first string was normalized.
-     * The first and second strings must be different objects.
-     * @param first string, should be normalized
-     * @param second string, will be normalized
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return first
-     * @stable ICU 4.4
-     */
-    virtual UnicodeString &
-    normalizeSecondAndAppend(UnicodeString &first,
-                             const UnicodeString &second,
-                             UErrorCode &errorCode) const = 0;
-    /**
-     * Appends the second string to the first string
-     * (merging them at the boundary) and returns the first string.
-     * The result is normalized if both the strings were normalized.
-     * The first and second strings must be different objects.
-     * @param first string, should be normalized
-     * @param second string, should be normalized
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return first
-     * @stable ICU 4.4
-     */
-    virtual UnicodeString &
-    append(UnicodeString &first,
-           const UnicodeString &second,
-           UErrorCode &errorCode) const = 0;
-
-    /**
-     * Gets the decomposition mapping of c. Equivalent to normalize(UnicodeString(c))
-     * on a UNORM2_DECOMPOSE Normalizer2 instance, but much faster.
-     * This function is independent of the mode of the Normalizer2.
-     * @param c code point
-     * @param decomposition String object which will be set to c's
-     *                      decomposition mapping, if there is one.
-     * @return TRUE if c has a decomposition, otherwise FALSE
-     * @draft ICU 4.6
-     */
-    virtual UBool
-    getDecomposition(UChar32 c, UnicodeString &decomposition) const = 0;
-
-    /**
-     * Tests if the string is normalized.
-     * Internally, in cases where the quickCheck() method would return "maybe"
-     * (which is only possible for the two COMPOSE modes) this method
-     * resolves to "yes" or "no" to provide a definitive result,
-     * at the cost of doing more work in those cases.
-     * @param s input string
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return TRUE if s is normalized
-     * @stable ICU 4.4
-     */
-    virtual UBool
-    isNormalized(const UnicodeString &s, UErrorCode &errorCode) const = 0;
-
-    /**
-     * Tests if the string is normalized.
-     * For the two COMPOSE modes, the result could be "maybe" in cases that
-     * would take a little more work to resolve definitively.
-     * Use spanQuickCheckYes() and normalizeSecondAndAppend() for a faster
-     * combination of quick check + normalization, to avoid
-     * re-checking the "yes" prefix.
-     * @param s input string
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return UNormalizationCheckResult
-     * @stable ICU 4.4
-     */
-    virtual UNormalizationCheckResult
-    quickCheck(const UnicodeString &s, UErrorCode &errorCode) const = 0;
-
-    /**
-     * Returns the end of the normalized substring of the input string.
-     * In other words, with <code>end=spanQuickCheckYes(s, ec);</code>
-     * the substring <code>UnicodeString(s, 0, end)</code>
-     * will pass the quick check with a "yes" result.
-     *
-     * The returned end index is usually one or more characters before the
-     * "no" or "maybe" character: The end index is at a normalization boundary.
-     * (See the class documentation for more about normalization boundaries.)
-     *
-     * When the goal is a normalized string and most input strings are expected
-     * to be normalized already, then call this method,
-     * and if it returns a prefix shorter than the input string,
-     * copy that prefix and use normalizeSecondAndAppend() for the remainder.
-     * @param s input string
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return "yes" span end index
-     * @stable ICU 4.4
-     */
-    virtual int32_t
-    spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const = 0;
-
-    /**
-     * Tests if the character always has a normalization boundary before it,
-     * regardless of context.
-     * If true, then the character does not normalization-interact with
-     * preceding characters.
-     * In other words, a string containing this character can be normalized
-     * by processing portions before this character and starting from this
-     * character independently.
-     * This is used for iterative normalization. See the class documentation for details.
-     * @param c character to test
-     * @return TRUE if c has a normalization boundary before it
-     * @stable ICU 4.4
-     */
-    virtual UBool hasBoundaryBefore(UChar32 c) const = 0;
-
-    /**
-     * Tests if the character always has a normalization boundary after it,
-     * regardless of context.
-     * If true, then the character does not normalization-interact with
-     * following characters.
-     * In other words, a string containing this character can be normalized
-     * by processing portions up to this character and after this
-     * character independently.
-     * This is used for iterative normalization. See the class documentation for details.
-     * Note that this operation may be significantly slower than hasBoundaryBefore().
-     * @param c character to test
-     * @return TRUE if c has a normalization boundary after it
-     * @stable ICU 4.4
-     */
-    virtual UBool hasBoundaryAfter(UChar32 c) const = 0;
-
-    /**
-     * Tests if the character is normalization-inert.
-     * If true, then the character does not change, nor normalization-interact with
-     * preceding or following characters.
-     * In other words, a string containing this character can be normalized
-     * by processing portions before this character and after this
-     * character independently.
-     * This is used for iterative normalization. See the class documentation for details.
-     * Note that this operation may be significantly slower than hasBoundaryBefore().
-     * @param c character to test
-     * @return TRUE if c is normalization-inert
-     * @stable ICU 4.4
-     */
-    virtual UBool isInert(UChar32 c) const = 0;
-
-private:
-    // No ICU "poor man's RTTI" for this class nor its subclasses.
-    virtual UClassID getDynamicClassID() const;
-};
-
-/**
- * Normalization filtered by a UnicodeSet.
- * Normalizes portions of the text contained in the filter set and leaves
- * portions not contained in the filter set unchanged.
- * Filtering is done via UnicodeSet::span(..., USET_SPAN_SIMPLE).
- * Not-in-the-filter text is treated as "is normalized" and "quick check yes".
- * This class implements all of (and only) the Normalizer2 API.
- * An instance of this class is unmodifiable/immutable but is constructed and
- * must be destructed by the owner.
- * @stable ICU 4.4
- */
-class U_COMMON_API FilteredNormalizer2 : public Normalizer2 {
-public:
-    /**
-     * Constructs a filtered normalizer wrapping any Normalizer2 instance
-     * and a filter set.
-     * Both are aliased and must not be modified or deleted while this object
-     * is used.
-     * The filter set should be frozen; otherwise the performance will suffer greatly.
-     * @param n2 wrapped Normalizer2 instance
-     * @param filterSet UnicodeSet which determines the characters to be normalized
-     * @stable ICU 4.4
-     */
-    FilteredNormalizer2(const Normalizer2 &n2, const UnicodeSet &filterSet) :
-            norm2(n2), set(filterSet) {}
-
-    /**
-     * Writes the normalized form of the source string to the destination string
-     * (replacing its contents) and returns the destination string.
-     * The source and destination strings must be different objects.
-     * @param src source string
-     * @param dest destination string; its contents is replaced with normalized src
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return dest
-     * @stable ICU 4.4
-     */
-    virtual UnicodeString &
-    normalize(const UnicodeString &src,
-              UnicodeString &dest,
-              UErrorCode &errorCode) const;
-    /**
-     * Appends the normalized form of the second string to the first string
-     * (merging them at the boundary) and returns the first string.
-     * The result is normalized if the first string was normalized.
-     * The first and second strings must be different objects.
-     * @param first string, should be normalized
-     * @param second string, will be normalized
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return first
-     * @stable ICU 4.4
-     */
-    virtual UnicodeString &
-    normalizeSecondAndAppend(UnicodeString &first,
-                             const UnicodeString &second,
-                             UErrorCode &errorCode) const;
-    /**
-     * Appends the second string to the first string
-     * (merging them at the boundary) and returns the first string.
-     * The result is normalized if both the strings were normalized.
-     * The first and second strings must be different objects.
-     * @param first string, should be normalized
-     * @param second string, should be normalized
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return first
-     * @stable ICU 4.4
-     */
-    virtual UnicodeString &
-    append(UnicodeString &first,
-           const UnicodeString &second,
-           UErrorCode &errorCode) const;
-
-    /**
-     * Gets the decomposition mapping of c. Equivalent to normalize(UnicodeString(c))
-     * on a UNORM2_DECOMPOSE Normalizer2 instance, but much faster.
-     * This function is independent of the mode of the Normalizer2.
-     * @param c code point
-     * @param decomposition String object which will be set to c's
-     *                      decomposition mapping, if there is one.
-     * @return TRUE if c has a decomposition, otherwise FALSE
-     * @draft ICU 4.6
-     */
-    virtual UBool
-    getDecomposition(UChar32 c, UnicodeString &decomposition) const;
-
-    /**
-     * Tests if the string is normalized.
-     * For details see the Normalizer2 base class documentation.
-     * @param s input string
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return TRUE if s is normalized
-     * @stable ICU 4.4
-     */
-    virtual UBool
-    isNormalized(const UnicodeString &s, UErrorCode &errorCode) const;
-    /**
-     * Tests if the string is normalized.
-     * For details see the Normalizer2 base class documentation.
-     * @param s input string
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return UNormalizationCheckResult
-     * @stable ICU 4.4
-     */
-    virtual UNormalizationCheckResult
-    quickCheck(const UnicodeString &s, UErrorCode &errorCode) const;
-    /**
-     * Returns the end of the normalized substring of the input string.
-     * For details see the Normalizer2 base class documentation.
-     * @param s input string
-     * @param errorCode Standard ICU error code. Its input value must
-     *                  pass the U_SUCCESS() test, or else the function returns
-     *                  immediately. Check for U_FAILURE() on output or use with
-     *                  function chaining. (See User Guide for details.)
-     * @return "yes" span end index
-     * @stable ICU 4.4
-     */
-    virtual int32_t
-    spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const;
-
-    /**
-     * Tests if the character always has a normalization boundary before it,
-     * regardless of context.
-     * For details see the Normalizer2 base class documentation.
-     * @param c character to test
-     * @return TRUE if c has a normalization boundary before it
-     * @stable ICU 4.4
-     */
-    virtual UBool hasBoundaryBefore(UChar32 c) const;
-
-    /**
-     * Tests if the character always has a normalization boundary after it,
-     * regardless of context.
-     * For details see the Normalizer2 base class documentation.
-     * @param c character to test
-     * @return TRUE if c has a normalization boundary after it
-     * @stable ICU 4.4
-     */
-    virtual UBool hasBoundaryAfter(UChar32 c) const;
-
-    /**
-     * Tests if the character is normalization-inert.
-     * For details see the Normalizer2 base class documentation.
-     * @param c character to test
-     * @return TRUE if c is normalization-inert
-     * @stable ICU 4.4
-     */
-    virtual UBool isInert(UChar32 c) const;
-private:
-    UnicodeString &
-    normalize(const UnicodeString &src,
-              UnicodeString &dest,
-              USetSpanCondition spanCondition,
-              UErrorCode &errorCode) const;
-
-    UnicodeString &
-    normalizeSecondAndAppend(UnicodeString &first,
-                             const UnicodeString &second,
-                             UBool doNormalize,
-                             UErrorCode &errorCode) const;
-
-    const Normalizer2 &norm2;
-    const UnicodeSet &set;
-};
-
-U_NAMESPACE_END
-
-#endif  // !UCONFIG_NO_NORMALIZATION
-#endif  // __NORMALIZER2_H__