235 lines
7.7 KiB
C++
235 lines
7.7 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001-2002, 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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#ifndef _UPROPSET_H_
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#define _UPROPSET_H_
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#include "unicode/utypes.h"
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#include "unicode/uscript.h"
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U_NAMESPACE_BEGIN
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class UnicodeString;
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class UnicodeSet;
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class ParsePosition;
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class Hashtable;
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/**
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* INTERNAL CLASS implementing the UnicodeSet properties as outlined
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* at:
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*
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* http://oss.software.ibm.com/cvs/icu/~checkout~/icuhtml/design/unicodeset_properties.html
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*
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* Recognized syntax:
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*
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* [:foo:] [:^foo:] - white space not allowed within "[:" or ":]"
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* \p{foo} \P{foo} - white space not allowed within "\p" or "\P"
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*
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* Other than the above restrictions, white space is ignored. Case
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* is ignored except in "\p" and "\P".
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*
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* This class cannot be instantiated. It has a public static method,
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* createPropertySet(), with takes a pattern to be parsed and returns
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* a new UnicodeSet. Another public static method,
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* resemblesPattern(), returns true if a given pattern string appears
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* to be a property set pattern, and therefore should be passed in to
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* createPropertySet().
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*
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* NOTE: Current implementation is incomplete. The following list
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* indicates which properties are supported.
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*
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* + GeneralCategory
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* CombiningClass
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* BidiClass
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* DecompositionType
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* + NumericValue
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* NumericType
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* EastAsianWidth
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* LineBreak
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* JoiningType
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* + Script
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*
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* '+' indicates a supported property.
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*
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* @author Alan Liu
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* @internal
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*/
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class UnicodePropertySet {
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public:
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//----------------------------------------------------------------
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// Public API
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//----------------------------------------------------------------
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/**
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* Return true if the given position, in the given pattern, appears
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* to be the start of a property set pattern [:foo:], \p{foo}, or
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* \P{foo}.
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*/
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static UBool resemblesPattern(const UnicodeString& pattern, int32_t pos);
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/**
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* Create a UnicodeSet by parsing the given pattern at the given
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* parse position.
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*
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* @param pattern the pattern string
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* @param ppos on entry, the position at which to begin parsing.
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* This shold be one of the locations marked '^':
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*
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* [:blah:] \p{blah} \P{blah}
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* ^ % ^ % ^ %
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*
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* On return, the position after the last character parsed, that is,
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* the locations marked '%'. If the parse fails, ppos is returned
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* unchanged.
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* @return a newly-constructed UnicodeSet object, or null upon
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* failure.
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*/
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static UnicodeSet* createFromPattern(const UnicodeString& pattern,
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ParsePosition& ppos);
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typedef UnicodeSet* (*SetFactory)(const UnicodeString& valueName);
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private:
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//----------------------------------------------------------------
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// Property set factory static methods
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// NOTE: This will change/go away when we implement UCharacter
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// based property retrieval.
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//----------------------------------------------------------------
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static UnicodeSet* createNumericValueSet(const UnicodeString& valueName);
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/**
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* Given a general category value name, create a corresponding
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* set and return it, or return null if the name is invalid.
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* @param valueName a pre-munged general category value name
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*/
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static UnicodeSet* createCategorySet(const UnicodeString& valueName);
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/**
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* Given a script value name, create a corresponding set and
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* return it, or return null if the name is invalid.
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* @param valueName a pre-munged script value name
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*/
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static UnicodeSet* createScriptSet(const UnicodeString& valueName);
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//----------------------------------------------------------------
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// Utility methods
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//----------------------------------------------------------------
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/**
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* Returns a UnicodeSet for the given category. This set is
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* cached and returned again if this method is called again with
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* the same parameter.
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*
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* Callers MUST NOT MODIFY the returned set.
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*/
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static const UnicodeSet& getCategorySet(int32_t cat);
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/**
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* Returns a UnicodeSet for the given script. This set is
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* cached and returned again if this method is called again with
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* the same parameter.
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*
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* Callers MUST NOT MODIFY the returned set.
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*/
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static const UnicodeSet& getScriptSet(UScriptCode script);
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/**
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* Given a string, munge it to upper case and lose the whitespace.
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* So "General Category " becomes "GENERALCATEGORY". We munge all
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* type and value strings, and store all type and value keys
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* pre-munged.
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*/
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static UnicodeString munge(const UnicodeString& str, int32_t start, int32_t limit);
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/**
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* Skip over a sequence of zero or more white space characters
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* at pos. Return the index of the first non-white-space character
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* at or after pos, or str.length(), if there is none.
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*/
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static int32_t skipWhitespace(const UnicodeString& str, int32_t pos);
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//----------------------------------------------------------------
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// Generic filter-based scanning code
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//
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// NOTE: In general, we don't want to do this! This is a temporary
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// implementation until we have time for something that examines
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// the underlying UCharacter data structures in an intelligent
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// way. Iterating over all code points is dumb. What we want to
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// do, for instance, is iterate over internally-stored ranges
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// of characters that have a given property.
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//----------------------------------------------------------------
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/**
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* A filter that returns TRUE if the given code point should be
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* included in the UnicodeSet being constructed.
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*/
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typedef UBool (*Filter)(UChar32 codePoint, void* context);
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/**
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* Set the given UnicodeSet to contain all code points for which
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* filter returns TRUE. The context parameter is passed unchanged
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* to the filter function.
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*/
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static void initSetFromFilter(UnicodeSet& set, Filter filter,
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void* context);
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//----------------------------------------------------------------
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// Type and value name maps
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//----------------------------------------------------------------
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/**
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* Add a type mapping to the name map.
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*/
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static void addType(const UnicodeString& shortName,
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const UnicodeString& longName,
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SetFactory factory);
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/**
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* Add a value mapping to the name map.
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*/
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static void addValue(Hashtable* map,
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const UnicodeString& shortName,
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const UnicodeString& longName,
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int32_t value);
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static void init();
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private:
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//----------------------------------------------------------------
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// SetFactory <=> void*
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// I don't know why the compiler won't cast between these types.
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// They should be interconvertible. Does C++ distinguish between
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// pointers into code and pointers into data? In any case, we
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// convert between these types in a safe way here.
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//----------------------------------------------------------------
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union SetFactoryTok {
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void* voidPointer;
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SetFactory functionPointer;
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};
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inline static void* setFactoryToVoidPtr(SetFactory f) {
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SetFactoryTok tok;
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tok.functionPointer = f;
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return tok.voidPointer;
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}
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inline static SetFactory voidPtrToSetFactory(void* p) {
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SetFactoryTok tok;
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tok.voidPointer = p;
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return tok.functionPointer;
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}
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};
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U_NAMESPACE_END
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#endif
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