219 lines
7.1 KiB
C++
219 lines
7.1 KiB
C++
/******************************************************************************
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* Copyright © {1996-1999}, International Business Machines Corporation and others. All Rights Reserved.
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******************************************************************************
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*/
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//=============================================================================
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//
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// File mergecol.h
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//
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//
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//
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// Created by: Helena Shih
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//
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// Modification History:
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//
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// Date Name Description
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// 3/5/97 mark Cleaned up fixEntry(). Added constants BYTEPOWER
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// and BYTEMASK to replace BYTESIZE.
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// 6/17/97 helena In getPattern, added the queue-up list for entries
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// with the same extension chars.
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// 8/18/97 helena Added internal API documentation.
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// 8/13/98 erm Synched up with 1.2 version of MergeCollation.java
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// 04/23/99 stephen Removed EDecompositionMode, merged with
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// Normalizer::EMode
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//=============================================================================
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#ifndef MERGECOL_H
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#define MERGECOL_H
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#include "unicode/unistr.h"
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#include "ptnentry.h"
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#include "tables.h"
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#include "unicode/coll.h"
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#include "unicode/normlzr.h"
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/**
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* Utility class for normalizing and merging patterns for collation.
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* Patterns are strings of the form <entry>*, where <entry> has the
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* form:
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* <pre>
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* <pattern> := <entry>*
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* <entry> := <separator><chars>{"/"<extension>}
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* <separator> := "=", ",", ";", "<", "&"
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* <chars>, and <extension> are both arbitrary strings.
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* </pre>
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* <P>Unquoted whitespaces are ignored.
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* 'xxx' can be used to quote characters.
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* <P>
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* One difference from Collation is that & is used to reset to a current
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* point. Or, in other words, it introduces a new sequence which is to
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* be added to the old.
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* <P>
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* That is: "a < b < c < d" is the same as "a < b & b < c & c < d" OR
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* "a < b < d & b < c"
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* XXX: make '' be a single quote.
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* @see PatternEntry
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* @version 1.4 1/7/97
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* @author Mark Davis, Helena Shih
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*/
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class MergeCollation
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{
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public:
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/**
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* Creates a merged collation table from a pattern string.
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* @param pattern the pattern string.
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* @param status the error code status. If the input pattern is incorrect,
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* this will be set to U_INVALID_FORMAT_ERROR.
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*/
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MergeCollation( const UnicodeString& pattern,
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Normalizer::EMode decompMode,
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UErrorCode& success);
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/**
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* Copy constructor.
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*/
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MergeCollation( const MergeCollation& other);
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/**
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* Destructor.
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*/
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~MergeCollation();
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/** Assignment operator
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*/
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const MergeCollation& operator=(const MergeCollation& other);
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/**
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* Recovers current pattern from this merged collation object.
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* @param pattern the result buffer.
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* @return the recovered result.
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*/
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UnicodeString& getPattern(UnicodeString& pattern) const;
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/**
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* Recovers current pattern with white spaces.
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* @param pattern the result buffer.
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* @param withWhiteSpace puts spacing around the entries, and \n
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* before & and <
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* @return the recovered result.
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*/
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UnicodeString& getPattern(UnicodeString& pattern, UBool withWhiteSpace) const;
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/**
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* Emits the pattern for collation builder.
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* @param pattern the result buffer.
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* @return Emits the string in the format understable to the collation
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* builder.
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*/
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UnicodeString& emitPattern(UnicodeString& pattern) const;
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/**
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* Emits the pattern for collation builder.
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* @param pattern the result buffer.
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* @param withWhiteSpace puts spacing around the entries, and \n
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* before & and <
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* @return Emits the string in the format understable to the collation
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* builder.
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*/
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UnicodeString& emitPattern(UnicodeString& pattern, UBool withWhiteSpace) const;
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/**
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* Sets the pattern.
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* @param pattern string.
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* @param status the error code status, it will be set to U_INVALID_FORMAT_ERROR
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* if the pattern is incorrect.
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*/
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void setPattern(const UnicodeString& pattern,
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Normalizer::EMode decompMode,
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UErrorCode& status);
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/**
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* Adds a pattern to the current merge collation object.
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* @param pattern the new pattern to be added.
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* @param status the error code status, it will be set to U_INVALID_FORMAT_ERROR
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* if the pattern is incorrect.
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*/
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void addPattern(const UnicodeString& pattern,
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Normalizer::EMode decompMode,
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UErrorCode& status);
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/**
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* Gets count of separate entries in the merge collation object.
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* @return the number of pattern entries
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*/
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int32_t getCount(void) const;
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/**
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* Gets the specified pattern entry out of the merge collation object.
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* @param index the offset of the desired pattern entry
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* @return the requested pattern entry
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*/
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const PatternEntry* getItemAt(UTextOffset index) const;
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private:
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//============================================================
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// privates
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//============================================================
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VectorOfPointersToPatternEntry* patterns; // a vector of PatternEntries
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static const int32_t BITARRAYSIZE;
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static const uint8_t BITARRAYMASK;
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static const int32_t BYTEPOWER;
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static const int32_t BYTEMASK;
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PatternEntry* lastEntry;
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PatternEntry* saveEntry;
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uint8_t* statusArray;
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/**
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* Finds the last pattern entry before the specified offset that does not have
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* extension chars.
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* @param i the offset.
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* @return the pattern entry.
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*/
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const PatternEntry* findLastWithNoExtension(int32_t i) const;
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/**
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* Fixes the new pattern entry in the merge collation table.
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* If the strength is RESET, then just change the lastEntry to
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* be the current. (If the current is not in patterns, signal an error).
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* If not, then remove the current entry, and add it after lastEntry
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* (which is usually at the end). Strength indicates the text order
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* weight for an entry.
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* @param newEntry the new pattern entry
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* @param status the error code status, it will be set to U_INVALID_FORMAT_ERROR
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* if the strength is RESET and a previous entry can't be found.
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*/
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void fixEntry( PatternEntry* newEntry,
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UErrorCode& status);
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/**
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* Finds the offset of the specified entry that was previously installed in the
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* merge collation object.
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* @param lastEntry the entry that was previously installed.
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* @param excess the extra characters
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* @param status the error code status, it will be set to U_INVALID_FORMAT_ERROR
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* if the strength is RESET and a previous entry can't be found.
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* @return the offset of the found entry
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*/
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int32_t findLastEntry( const PatternEntry* lastEntry,
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UnicodeString& excess,
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UErrorCode& success) const;
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};
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inline UnicodeString& MergeCollation::getPattern(UnicodeString& result) const
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{
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return getPattern(result, TRUE);
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}
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inline UnicodeString& MergeCollation::emitPattern(UnicodeString& result) const
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{
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return emitPattern(result, TRUE);
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}
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#endif // _MERGECOL
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