721 lines
25 KiB
C++
721 lines
25 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 2011 International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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*/
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#ifndef INDEXCHARS_H
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#define INDEXCHARS_H
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#include "unicode/utypes.h"
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#include "unicode/uobject.h"
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#include "unicode/locid.h"
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/**
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* \file
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* \brief C++ API: Index Characters
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*/
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U_CDECL_BEGIN
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/**
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* Constants for Alphabetic Index Label Types.
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* The form of these enum constants anticipates having a plain C API
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* for Alphabetic Indexes that will also use them.
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* @draft ICU 4.8
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*/
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typedef enum UAlphabeticIndexLabelType {
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/**
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* Normal Label, typically the starting letter of the names
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* in the bucket with this label.
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* @draft ICU 4.8
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*/
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U_ALPHAINDEX_NORMAL = 0,
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/**
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* Undeflow Label. The bucket with this label contains names
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* in scripts that sort before any of the bucket labels in this index.
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* @draft ICU 4.8
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*/
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U_ALPHAINDEX_UNDERFLOW = 1,
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/**
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* Inflow Label. The bucket with this label contains names
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* in scripts that sort between two of the bucket labels in this index.
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* Inflow labels are created when an index contains normal labels for
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* multiple scripts, and skips other scripts that sort between some of the
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* included scripts.
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* @draft ICU 4.8
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*/
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U_ALPHAINDEX_INFLOW = 2,
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/**
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* Overflow Label. Te bucket with this label contains names in scripts
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* that sort after all of the bucket labels in this index.
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* @draft ICU 4.8
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*/
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U_ALPHAINDEX_OVERFLOW = 3
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} UAlphabeticIndexLabelType;
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struct UHashtable;
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U_CDECL_END
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U_NAMESPACE_BEGIN
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// Forward Declarations
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class Collator;
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class RuleBasedCollator;
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class StringEnumeration;
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class UnicodeSet;
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class UVector;
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/**
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* class AlphabeticIndex supports the creation of a UI index appropriate for a given language, such as:
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*
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* <pre>
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* <b>... A B C D E F G H I J K L M N O P Q R S T U V W X Y Z \\u00C6 \\u00D8 \\u00C5 ...</b>
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*
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* <b>A</b>
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* Addison
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* Albertson
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* Azensky
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* <b>B</b>
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* Baker
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* ...
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* </pre>
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*
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* The class can generate a list of labels for use as a UI "index", that is, a list of
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* clickable characters (or character sequences) that allow the user to see a segment
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* (bucket) of a larger "target" list. That is, each label corresponds to a bucket in
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* the target list, where everything in the bucket is greater than or equal to the character
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* (according to the locale's collation). Strings can be added to the index;
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* they will be in sorted order in the right bucket.
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* <p>
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* The class also supports having buckets for strings before the first (underflow),
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* after the last (overflow), and between scripts (inflow). For example, if the index
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* is constructed with labels for Russian and English, Greek characters would fall
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* into an inflow bucket between the other two scripts.
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* <p>
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* The AlphabeticIndex class is not intended for public subclassing.
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* <p>
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* <i>Example</i>
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* <p>
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* The "show..." methods below are just to illustrate usage.
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*
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* <pre>
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* // Create a simple index. "Item" is assumed to be an application
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* // defined type that the application's UI and other processing knows about,
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* // and that has a name.
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*
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* UErrorCode status = U_ZERO_ERROR;
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* AlphabeticIndex index = new AlphabeticIndex(desiredLocale, status);
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* index->addLabels(additionalLocale, status);
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* for (Item *item in some source of Items ) {
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* index->addRecord(item->name(), item, status);
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* }
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* ...
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* // Show index at top. We could skip or gray out empty buckets
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*
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* while (index->nextBucket(status)) {
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* if (showAll || index->getBucketRecordCount() != 0) {
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* showLabelAtTop(UI, index->getBucketLabel());
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* }
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* }
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* ...
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* // Show the buckets with their contents, skipping empty buckets
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*
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* index->resetBucketIterator(status);
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* while (index->nextBucket(status)) {
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* if (index->getBucketRecordCount() != 0) {
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* showLabelInList(UI, index->getBucketLabel());
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* while (index->nextRecord(status)) {
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* showIndexedItem(UI, static_cast<Item *>(index->getRecordData()))
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* </pre>
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*
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* The caller can build different UIs using this class.
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* For example, an index character could be omitted or grayed-out
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* if its bucket is empty. Small buckets could also be combined based on size, such as:
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*
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* <pre>
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* <b>... A-F G-N O-Z ...</b>
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* </pre>
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*
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* <p>
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* <b>Notes:</b>
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* <ul>
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* <li>Additional collation parameters can be passed in as part of the locale name.
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* For example, German plus numeric
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* sorting would be "de@kn-true".
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* </ul>
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*
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* @draft ICU 4.8 This API might change or be removed in a future release.
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*/
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class U_I18N_API AlphabeticIndex: public UObject {
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public:
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/**
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* Construct an AlphabeticIndex object for the specified locale. If the locale's
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* data does not include index characters, a set of them will be
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* synthesized based on the locale's exemplar characters. The locale
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* determines the sorting order for both the index characters and the
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* user item names appearing under each Index character.
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*
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* @param locale the desired locale.
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* @param status Error code, will be set with the reason if the construction
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* of the AlphabeticIndex object fails.
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* @draft ICU 4.8
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*/
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AlphabeticIndex(const Locale &locale, UErrorCode &status);
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/**
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* Add Labels to this Index. The labels are additions to those
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* that are already in the index; they do not replace the existing
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* ones.
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* @param additions The additional characters to add to the index, such as A-Z.
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* @param status Error code, will be set with the reason if the
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* operation fails.
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* @return this, for chaining
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &addLabels(const UnicodeSet &additions, UErrorCode &status);
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/**
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* Add the index characters from a Locale to the index. The labels
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* are added to those that are already in the index; they do not replace the
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* existing index characters. The collation order for this index is not
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* changed; it remains that of the locale that was originally specified
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* when creating this Index.
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*
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* @param locale The locale whose index characters are to be added.
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* @param status Error code, will be set with the reason if the
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* operation fails.
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* @return this, for chaining
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &addLabels(const Locale &locale, UErrorCode &status);
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/**
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* Destructor
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* @draft ICU 4.8
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*/
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virtual ~AlphabeticIndex();
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/**
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* Get the Collator that establishes the ordering of the items in this index.
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* Ownership of the collator remains with the AlphabeticIndex instance.
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*
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* The returned collator is a reference to the internal collator used by this
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* index. It may be safely used to compare the names of items or to get
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* sort keys for names. However if any settings need to be changed,
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* or other non-const methods called, a cloned copy must be made first.
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*
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* @return The collator
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* @draft ICU 4.8
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*/
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virtual const RuleBasedCollator &getCollator() const;
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/**
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* Get the default label used for abbreviated buckets <i>between</i> other index characters.
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* For example, consider the labels when Latin and Greek are used:
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* X Y Z ... Α Β Γ.
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*
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* @return inflow label
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* @draft ICU 4.8
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*/
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virtual const UnicodeString &getInflowLabel() const;
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/**
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* Set the default label used for abbreviated buckets <i>between</i> other index characters.
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* An inflow label will be automatically inserted if two otherwise-adjacent label characters
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* are from different scripts, e.g. Latin and Cyrillic, and a third script, e.g. Greek,
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* sorts between the two. The default inflow character is an ellipsis (...)
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*
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* @param inflowLabel the new Inflow label.
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* @param status Error code, will be set with the reason if the operation fails.
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* @return this
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &setInflowLabel(const UnicodeString &inflowLabel, UErrorCode &status);
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/**
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* Get the special label used for items that sort after the last normal label,
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* and that would not otherwise have an appropriate label.
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*
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* @return the overflow label
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* @draft ICU 4.8
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*/
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virtual const UnicodeString &getOverflowLabel() const;
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/**
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* Set the label used for items that sort after the last normal label,
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* and that would not otherwise have an appropriate label.
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*
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* @param overflowLabel the new overflow label.
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* @param status Error code, will be set with the reason if the operation fails.
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* @return this
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &setOverflowLabel(const UnicodeString &overflowLabel, UErrorCode &status);
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/**
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* Get the special label used for items that sort before the first normal label,
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* and that would not otherwise have an appropriate label.
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*
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* @return underflow label
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* @draft ICU 4.8
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*/
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virtual const UnicodeString &getUnderflowLabel() const;
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/**
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* Set the label used for items that sort before the first normal label,
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* and that would not otherwise have an appropriate label.
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*
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* @param underflowLabel the new underflow label.
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* @param status Error code, will be set with the reason if the operation fails.
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* @return this
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &setUnderflowLabel(const UnicodeString &underflowLabel, UErrorCode &status);
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/**
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* Get the limit on the number of labels permitted in the index.
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* The number does not include over, under and inflow labels.
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*
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* @return maxLabelCount maximum number of labels.
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* @draft ICU 4.8
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*/
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virtual int32_t getMaxLabelCount() const;
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/**
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* Set a limit on the number of labels permitted in the index.
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* The number does not include over, under and inflow labels.
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* Currently, if the number is exceeded, then every
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* nth item is removed to bring the count down.
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* A more sophisticated mechanism may be available in the future.
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*
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* @param maxLabelCount the maximum number of labels.
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* @param status error code
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* @return This, for chaining
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &setMaxLabelCount(int32_t maxLabelCount, UErrorCode &status);
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/**
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* Get the Unicode character (or tailored string) that defines an overflow bucket;
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* that is anything greater than or equal to that string should go in that bucket,
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* instead of with the last character. Normally that is the first character of the script
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* after lowerLimit. Thus in X Y Z ... <i>Devanagari-ka</i>, the overflow character for Z
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* would be the <i>Greek-alpha</i>.
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*
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* @param lowerLimit The character below the overflow (or inflow) bucket
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* @param status error code
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* @return string that defines top of the overflow buck for lowerLimit, or an empty string if there is none
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* @internal
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*/
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virtual const UnicodeString &getOverflowComparisonString(const UnicodeString &lowerLimit,
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UErrorCode &status);
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/**
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* Add a record to the index. Each record will be associated with an index Bucket
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* based on the record's name. The list of records for each bucket will be sorted
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* based on the collation ordering of the names in the index's locale.
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* Records with duplicate names are permitted; they will be kept in the order
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* that they were added.
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*
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* @param name The display name for the Record. The Record will be placed in
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* a bucket based on this name.
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* @param data An optional pointer to user data associated with this
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* item. When iterating the contents of a bucket, both the
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* data pointer the name will be available for each Record.
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* @param status Error code, will be set with the reason if the operation fails.
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* @return This, for chaining.
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &addRecord(const UnicodeString &name, const void *data, UErrorCode &status);
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/**
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* Remove all Records from the Index. The set of Buckets, which define the headings under
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* which records are classified, is not altered.
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*
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* @param status Error code, will be set with the reason if the operation fails.
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* @return This, for chaining.
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &clearRecords(UErrorCode &status);
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/** Get the number of labels in this index.
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* Note: may trigger lazy index construction.
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*
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* @param status Error code, will be set with the reason if the operation fails.
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* @return The number of labels in this index, including any under, over or
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* in-flow labels.
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* @draft ICU 4.8
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*/
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virtual int32_t getBucketCount(UErrorCode &status);
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/** Get the total number of Records in this index, that is, the number
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* of <name, data> pairs added.
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*
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* @param status Error code, will be set with the reason if the operation fails.
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* @return The number of records in this index, that is, the total number
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* of (name, data) items added with addRecord().
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* @draft ICU 4.8
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*/
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virtual int32_t getRecordCount(UErrorCode &status);
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/**
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* Given the name of a record, return the zero-based index of the Bucket
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* in which the item should appear. The name need not be in the index.
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* A Record will not be added to the index by this function.
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* Bucket numbers are zero-based, in Bucket iteration order.
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*
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* @param itemName The name whose bucket position in the index is to be determined.
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* @param status Error code, will be set with the reason if the operation fails.
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* @return The bucket number for this name.
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* @draft ICU 4.8
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*
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*/
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virtual int32_t getBucketIndex(const UnicodeString &itemName, UErrorCode &status);
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/**
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* Get the zero based index of the current Bucket from an iteration
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* over the Buckets of this index. Return -1 if no iteration is in process.
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* @return the index of the current Bucket
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* @draft ICU 4.8
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*/
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virtual int32_t getBucketIndex() const;
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/**
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* Advance the iteration over the Buckets of this index. Return FALSE if
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* there are no more Buckets.
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*
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* @param status Error code, will be set with the reason if the operation fails.
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* U_ENUM_OUT_OF_SYNC_ERROR will be reported if the index is modified while
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* an enumeration of its contents are in process.
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*
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* @return TRUE if success, FALSE if at end of iteration
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* @draft ICU 4.8
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*/
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virtual UBool nextBucket(UErrorCode &status);
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/**
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* Return the name of the Label of the current bucket from an iteration over the buckets.
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* If the iteration is before the first Bucket (nextBucket() has not been called),
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* or after the last, return an empty string.
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*
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* @return the bucket label.
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* @draft ICU 4.8
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*/
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virtual const UnicodeString &getBucketLabel() const;
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/**
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* Return the type of the label for the current Bucket (selected by the
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* iteration over Buckets.)
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*
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* @return the label type.
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* @draft ICU 4.8
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*/
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virtual UAlphabeticIndexLabelType getBucketLabelType() const;
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/**
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* Get the number of <name, data> Records in the current Bucket.
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* If the current bucket iteration position is before the first label or after the
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* last, return 0.
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*
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* @return the number of Records.
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* @draft ICU 4.8
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*/
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virtual int32_t getBucketRecordCount() const;
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/**
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* Reset the Bucket iteration for this index. The next call to nextBucket()
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* will restart the iteration at the first label.
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*
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* @param status Error code, will be set with the reason if the operation fails.
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* @return this, for chaining.
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &resetBucketIterator(UErrorCode &status);
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/**
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* Advance to the next record in the current Bucket.
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* When nextBucket() is called, Record iteration is reset to just before the
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* first Record in the new Bucket.
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*
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* @param status Error code, will be set with the reason if the operation fails.
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* U_ENUM_OUT_OF_SYNC_ERROR will be reported if the index is modified while
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* an enumeration of its contents are in process.
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* @return TRUE if successful, FALSE when the iteration advances past the last item.
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* @draft ICU 4.8
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*/
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virtual UBool nextRecord(UErrorCode &status);
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/**
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* Get the name of the current Record.
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* Return an empty string if the Record iteration position is before first
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* or after the last.
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*
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* @return The name of the current index item.
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* @draft ICU 4.8
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*/
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virtual const UnicodeString &getRecordName() const;
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/**
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* Return the data pointer of the Record currently being iterated over.
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* Return NULL if the current iteration position before the first item in this Bucket,
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* or after the last.
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*
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* @return The current Record's data pointer.
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* @draft ICU 4.8
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*/
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virtual const void *getRecordData() const;
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/**
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* Reset the Record iterator position to before the first Record in the current Bucket.
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*
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* @return This, for chaining.
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* @draft ICU 4.8
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*/
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virtual AlphabeticIndex &resetRecordIterator();
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private:
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// No ICU "poor man's RTTI" for this class nor its subclasses.
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virtual UClassID getDynamicClassID() const;
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/**
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* No Copy constructor.
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* @internal
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*/
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AlphabeticIndex(const AlphabeticIndex &other);
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/**
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* No assignment.
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*/
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AlphabeticIndex &operator =(const AlphabeticIndex & /*other*/) { return *this;};
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/**
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* No Equality operators.
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* @internal
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*/
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virtual UBool operator==(const AlphabeticIndex& other) const;
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/**
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* Inequality operator.
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* @internal
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*/
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virtual UBool operator!=(const AlphabeticIndex& other) const;
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// Common initialization, for use from all constructors.
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void init(UErrorCode &status);
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// Initialize & destruct static constants used by this class.
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static void staticInit(UErrorCode &status);
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// Pinyin stuff. If the input name is Chinese, add the Pinyin prefix to the dest string.
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void hackName(UnicodeString &dest, const UnicodeString &name, const Collator *coll);
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void initPinyinBounds(const Collator *coll, UErrorCode &status);
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public:
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/**
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* Delete all shared (static) data associated with an AlphabeticIndex.
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* Internal function, not intended for direct use.
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* @internal.
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*/
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static void staticCleanup();
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private:
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// Add index characters from the specified locale to the dest set.
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// Does not remove any previous contents from dest.
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static void getIndexExemplars(UnicodeSet &dest, const Locale &locale, UErrorCode &status);
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UVector *firstStringsInScript(UErrorCode &status);
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static UnicodeString separated(const UnicodeString &item);
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static UnicodeSet *getScriptSet(UnicodeSet &dest, const UnicodeString &codePoint, UErrorCode &status);
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void buildIndex(UErrorCode &status);
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void buildBucketList(UErrorCode &status);
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void bucketRecords(UErrorCode &status);
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public:
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// The following internal items are declared public only to allow access from
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// implementation code written in plain C. They are not intended for
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// public use.
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/**
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* A record, or item, in the index.
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* @internal
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*/
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struct Record: public UMemory {
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AlphabeticIndex *alphaIndex_;
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const UnicodeString name_;
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UnicodeString sortingName_; // Usually the same as name_; different for Pinyin.
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const void *data_;
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int32_t serialNumber_; // Defines sorting order for names that compare equal.
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Record(AlphabeticIndex *alphaIndex, const UnicodeString &name, const void *data);
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~Record();
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};
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/**
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* Holds all user records before they are distributed into buckets.
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* Type of contents is (Record *)
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* @internal
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*/
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UVector *inputRecords_;
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/**
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* A Bucket holds an index label and references to everything belonging to that label.
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* For implementation use only. Declared public because pure C implementation code needs access.
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* @internal
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*/
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struct Bucket: public UMemory {
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UnicodeString label_;
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UnicodeString lowerBoundary_;
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UAlphabeticIndexLabelType labelType_;
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UVector *records_; // Records are owned by inputRecords_ vector.
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Bucket(const UnicodeString &label, // Parameter strings are copied.
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const UnicodeString &lowerBoundary,
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UAlphabeticIndexLabelType type, UErrorCode &status);
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~Bucket();
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};
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public:
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/**
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* Language Types. For internal ICU use only.
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* @internal
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*/
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enum ELangType {
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/** @internal */
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kNormal,
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/** @internal */
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kSimplified,
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/** @internal */
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kTraditional
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};
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/**
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* Get the Language Type for this Index. Based on the locale.
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* @internal
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*/
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static ELangType langTypeFromLocale(const Locale &loc);
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private:
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// Holds the contents of this index, buckets of user items.
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// UVector elements are of type (Bucket *)
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UVector *bucketList_;
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int32_t labelsIterIndex_; // Index of next item to return.
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int32_t itemsIterIndex_;
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Bucket *currentBucket_; // While an iteration of the index in underway,
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// point to the bucket for the current label.
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// NULL when no iteration underway.
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UBool indexBuildRequired_; // Caller has made changes to the index that
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// require rebuilding & bucketing before the
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// contents can be iterated.
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int32_t maxLabelCount_; // Limit on # of labels permitted in the index.
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UHashtable *alreadyIn_; // Key=UnicodeString, value=UnicodeSet
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UnicodeSet *initialLabels_; // Initial (unprocessed) set of Labels. Union
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// of those explicitly set by the user plus
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// those from locales. Raw values, before
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// crunching into bucket labels.
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UVector *labels_; // List of Labels, after processing, sorting.
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// Contents are (UnicodeString *)
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UnicodeSet *noDistinctSorting_; // As the set of labels is built, strings may
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// be discarded from the exemplars. This contains
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// some of the discards, and is
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// intended for debugging.
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UnicodeSet *notAlphabetic_; // As the set of labels is built, strings may
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// be discarded from the exemplars. This contains
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// some of the discards, and is
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// intended for debugging.
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UVector *firstScriptCharacters_; // The first character from each script,
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// in collation order.
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Locale locale_;
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Collator *collator_;
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Collator *collatorPrimaryOnly_;
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UnicodeString inflowLabel_;
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UnicodeString overflowLabel_;
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UnicodeString underflowLabel_;
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UnicodeString overflowComparisonString_;
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ELangType langType_; // The language type, simplified Chinese, Traditional Chinese,
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// or not Chinese (Normal). Part of the Pinyin support
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typedef const UChar PinyinLookup[24][3];
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static PinyinLookup HACK_PINYIN_LOOKUP_SHORT;
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static PinyinLookup HACK_PINYIN_LOOKUP_LONG;
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// These will be lazily set to the short or long tables based on which
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// Chinese collation has been configured into the ICU library.
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static PinyinLookup *HACK_PINYIN_LOOKUP;
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static const UChar *PINYIN_LOWER_BOUNDS;
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int32_t recordCounter_; // Counts Records created. For minting record serial numbers.
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// Constants. Lazily initialized the first time an AlphabeticIndex object is created.
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static UnicodeSet *ALPHABETIC;
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static UnicodeSet *CORE_LATIN;
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static UnicodeSet *ETHIOPIC;
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static UnicodeSet *HANGUL;
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static UnicodeSet *IGNORE_SCRIPTS;
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static UnicodeSet *TO_TRY;
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static UnicodeSet *UNIHAN;
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static const UnicodeString *EMPTY_STRING;
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};
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U_NAMESPACE_END
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#endif
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