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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2013-2014, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* collationruleparser.h
*
* created on: 2013apr10
* created by: Markus W. Scherer
*/
#ifndef __COLLATIONRULEPARSER_H__
#define __COLLATIONRULEPARSER_H__
#include "unicode/utypes.h"
#if !UCONFIG_NO_COLLATION
#include "unicode/ucol.h"
#include "unicode/uniset.h"
#include "unicode/unistr.h"
struct UParseError;
U_NAMESPACE_BEGIN
struct CollationData;
struct CollationTailoring;
class Locale;
class Normalizer2;
struct CollationSettings;
class U_I18N_API CollationRuleParser : public UMemory {
public:
/** Special reset positions. */
enum Position {
FIRST_TERTIARY_IGNORABLE,
LAST_TERTIARY_IGNORABLE,
FIRST_SECONDARY_IGNORABLE,
LAST_SECONDARY_IGNORABLE,
FIRST_PRIMARY_IGNORABLE,
LAST_PRIMARY_IGNORABLE,
FIRST_VARIABLE,
LAST_VARIABLE,
FIRST_REGULAR,
LAST_REGULAR,
FIRST_IMPLICIT,
LAST_IMPLICIT,
FIRST_TRAILING,
LAST_TRAILING
};
/**
* First character of contractions that encode special reset positions.
* U+FFFE cannot be tailored via rule syntax.
*
* The second contraction character is POS_BASE + Position.
*/
static const char16_t POS_LEAD = 0xfffe;
/**
* Base for the second character of contractions that encode special reset positions.
* Braille characters U+28xx are printable and normalization-inert.
* @see POS_LEAD
*/
static const char16_t POS_BASE = 0x2800;
class U_I18N_API Sink : public UObject {
public:
virtual ~Sink();
/**
* Adds a reset.
* strength=UCOL_IDENTICAL for &str.
* strength=UCOL_PRIMARY/UCOL_SECONDARY/UCOL_TERTIARY for &[before n]str where n=1/2/3.
*/
virtual void addReset(int32_t strength, const UnicodeString &str,
const char *&errorReason, UErrorCode &errorCode) = 0;
/**
* Adds a relation with strength and prefix | str / extension.
*/
virtual void addRelation(int32_t strength, const UnicodeString &prefix,
const UnicodeString &str, const UnicodeString &extension,
const char *&errorReason, UErrorCode &errorCode) = 0;
virtual void suppressContractions(const UnicodeSet &set, const char *&errorReason,
UErrorCode &errorCode);
virtual void optimize(const UnicodeSet &set, const char *&errorReason,
UErrorCode &errorCode);
};
class U_I18N_API Importer : public UObject {
public:
virtual ~Importer();
virtual void getRules(
const char *localeID, const char *collationType,
UnicodeString &rules,
const char *&errorReason, UErrorCode &errorCode) = 0;
};
/**
* Constructor.
* The Sink must be set before parsing.
* The Importer can be set, otherwise [import locale] syntax is not supported.
*/
CollationRuleParser(const CollationData *base, UErrorCode &errorCode);
~CollationRuleParser();
/**
* Sets the pointer to a Sink object.
* The pointer is aliased: Pointer copy without cloning or taking ownership.
*/
void setSink(Sink *sinkAlias) {
sink = sinkAlias;
}
/**
* Sets the pointer to an Importer object.
* The pointer is aliased: Pointer copy without cloning or taking ownership.
*/
void setImporter(Importer *importerAlias) {
importer = importerAlias;
}
void parse(const UnicodeString &ruleString,
CollationSettings &outSettings,
UParseError *outParseError,
UErrorCode &errorCode);
const char *getErrorReason() const { return errorReason; }
/**
* Gets a script or reorder code from its string representation.
* @return the script/reorder code, or
* -1 if not recognized
*/
static int32_t getReorderCode(const char *word);
private:
/** UCOL_PRIMARY=0 .. UCOL_IDENTICAL=15 */
static const int32_t STRENGTH_MASK = 0xf;
static const int32_t STARRED_FLAG = 0x10;
static const int32_t OFFSET_SHIFT = 8;
void parse(const UnicodeString &ruleString, UErrorCode &errorCode);
void parseRuleChain(UErrorCode &errorCode);
int32_t parseResetAndPosition(UErrorCode &errorCode);
int32_t parseRelationOperator(UErrorCode &errorCode);
void parseRelationStrings(int32_t strength, int32_t i, UErrorCode &errorCode);
void parseStarredCharacters(int32_t strength, int32_t i, UErrorCode &errorCode);
int32_t parseTailoringString(int32_t i, UnicodeString &raw, UErrorCode &errorCode);
int32_t parseString(int32_t i, UnicodeString &raw, UErrorCode &errorCode);
/**
* Sets str to a contraction of U+FFFE and (U+2800 + Position).
* @return rule index after the special reset position
*/
int32_t parseSpecialPosition(int32_t i, UnicodeString &str, UErrorCode &errorCode);
void parseSetting(UErrorCode &errorCode);
void parseReordering(const UnicodeString &raw, UErrorCode &errorCode);
static UColAttributeValue getOnOffValue(const UnicodeString &s);
int32_t parseUnicodeSet(int32_t i, UnicodeSet &set, UErrorCode &errorCode);
int32_t readWords(int32_t i, UnicodeString &raw) const;
int32_t skipComment(int32_t i) const;
void setParseError(const char *reason, UErrorCode &errorCode);
void setErrorContext();
/**
* ASCII [:P:] and [:S:]:
* [\u0021-\u002F \u003A-\u0040 \u005B-\u0060 \u007B-\u007E]
*/
static UBool isSyntaxChar(UChar32 c);
int32_t skipWhiteSpace(int32_t i) const;
const Normalizer2 &nfd, &nfc;
const UnicodeString *rules;
const CollationData *const baseData;
CollationSettings *settings;
UParseError *parseError;
const char *errorReason;
Sink *sink;
Importer *importer;
int32_t ruleIndex;
};
U_NAMESPACE_END
#endif // !UCONFIG_NO_COLLATION
#endif // __COLLATIONRULEPARSER_H__
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