601 lines
19 KiB
C++
601 lines
19 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* $Source: /xsrl/Nsvn/icu/icu/source/i18n/Attic/upropset.cpp,v $
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* $Date: 2001/10/24 05:42:13 $
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* $Revision: 1.3 $
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**********************************************************************
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*/
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#include "upropset.h"
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#include "ustrfmt.h"
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#include "unicode/unistr.h"
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#include "unicode/uscript.h"
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#include "unicode/uniset.h"
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#include "unicode/parsepos.h"
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#include "hash.h"
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U_NAMESPACE_BEGIN
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static Hashtable* NAME_MAP = NULL;
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static Hashtable* CATEGORY_MAP = NULL;
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/**
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* A cache mapping character category integers, as returned by
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* UCharacter.getType(), to sets. Entries are initially
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* null and are created on demand.
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*/
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static UnicodeSet* CATEGORY_CACHE = NULL;
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/**
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* A cache mapping script integers, as defined by
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* UScript, to sets. Entries are initially
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* null and are created on demand.
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*/
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static UnicodeSet* SCRIPT_CACHE = NULL;
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// Special value codes
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static const int32_t ANY = -1; // general category: all code points
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//----------------------------------------------------------------
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// Unicode string and character constants
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//----------------------------------------------------------------
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static const UChar POSIX_OPEN[] = { 91,58,0 }; // "[:"
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static const UChar POSIX_CLOSE[] = { 58,93,0 }; // ":]"
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static const UChar PERL_OPEN[] = { 92,112,0 }; // "\\p"
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static const UChar PERL_CLOSE[] = { 125,0 }; // "}"
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static const UChar HAT = 0x005E; /*^*/
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static const UChar UPPER_P = 0x0050; /*P*/
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static const UChar LEFT_BRACE = 0x007B; /*{*/
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static const UChar EQUALS = 0x003D; /*=*/
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//----------------------------------------------------------------------
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// class _CharString
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// An identical class named CharString can be found in transreg.cpp.
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// If we find ourselves needing another copy of this utility class we
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// should probably pull it out into putil or some such place.
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//----------------------------------------------------------------------
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class _CharString {
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public:
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_CharString(const UnicodeString& str);
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~_CharString();
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operator char*() { return ptr; }
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private:
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char buf[128];
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char* ptr;
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};
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_CharString::_CharString(const UnicodeString& str) {
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if (str.length() >= (int32_t)sizeof(buf)) {
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ptr = new char[str.length() + 8];
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} else {
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ptr = buf;
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}
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str.extract(0, 0x7FFFFFFF, ptr, "");
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}
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_CharString::~_CharString() {
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if (ptr != buf) {
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delete[] ptr;
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}
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}
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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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UBool UnicodePropertySet::resemblesPattern(const UnicodeString& pattern,
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int32_t pos) {
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// Patterns are at least 5 characters long
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if ((pos+5) > pattern.length()) {
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return FALSE;
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}
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// Look for an opening [:, [:^, \p, or \P
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return (0 == pattern.compare(pos, 2, POSIX_OPEN)) ||
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(0 == pattern.caseCompare(pos, 2, PERL_OPEN, U_FOLD_CASE_DEFAULT));
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}
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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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UnicodeSet* UnicodePropertySet::createFromPattern(const UnicodeString& pattern,
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ParsePosition& ppos) {
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init();
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UnicodeSet* set = NULL;
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int32_t pos = ppos.getIndex();
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// On entry, ppos should point to one of the following locations:
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// Minimum length is 5 characters, e.g. \p{L}
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if ((pos+5) > pattern.length()) {
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return NULL;
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}
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UBool posix = FALSE; // true for [:pat:], false for \p{pat} \P{pat}
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UBool invert = FALSE;
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// Look for an opening [:, [:^, \p, or \P
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if (0 == pattern.compare(pos, 2, POSIX_OPEN)) {
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posix = TRUE;
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pos = skipWhitespace(pattern, pos+2);
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if (pos < pattern.length() && pattern.charAt(pos) == HAT) {
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++pos;
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invert = TRUE;
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}
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} else if (0 == pattern.caseCompare(pos, 2, PERL_OPEN, U_FOLD_CASE_DEFAULT)) {
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invert = (pattern.charAt(pos+1) == UPPER_P);
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pos = skipWhitespace(pattern, pos+2);
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if (pos == pattern.length() || pattern.charAt(pos++) != LEFT_BRACE) {
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// Syntax error; "\p" or "\P" not followed by "{"
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return NULL;
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}
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} else {
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// Open delimiter not seen
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return NULL;
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}
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// Look for the matching close delimiter, either :] or }
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int32_t close = pattern.indexOf(posix ? POSIX_CLOSE : PERL_CLOSE, pos);
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if (close < 0) {
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// Syntax error; close delimiter missing
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return NULL;
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}
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// Look for an '=' sign. If this is present, we will parse a
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// medium \p{gc=Cf} or long \p{GeneralCategory=Format}
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// pattern.
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int32_t equals = pattern.indexOf(EQUALS, pos);
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if (equals >= 0 && equals < close) {
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// Equals seen; parse medium/long pattern
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UnicodeString typeName = munge(pattern, pos, equals);
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UnicodeString valueName = munge(pattern, equals+1, close);
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SetFactory factory;
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factory = voidPtrToSetFactory(NAME_MAP->get(typeName));
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if (factory == NULL) {
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// Syntax error; type name not recognized
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return NULL;
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}
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set = (*factory)(valueName);
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} else {
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// No equals seen; parse short format \p{Cf}
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UnicodeString shortName = munge(pattern, pos, close);
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// First try general category
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set = createCategorySet(shortName);
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// If this fails, try script
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if (set == NULL) {
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set = createScriptSet(shortName);
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}
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}
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// Upon failure, return NULL with ppos unchanged
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if (set == NULL) {
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return NULL;
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}
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if (invert) {
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set->complement();
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}
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// Move to the limit position after the close delimiter
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ppos.setIndex(close + (posix ? 2 : 1));
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return set;
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}
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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 UBool _numericValueFilter(UChar32 c, void* context) {
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int32_t value = * (int32_t*) context;
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// TODO: Change this to a more generic function, like
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// u_charNumericValue (when one exists).
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return u_charDigitValue(c) == value;
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}
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UnicodeSet* UnicodePropertySet::createNumericValueSet(const UnicodeString& valueName) {
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_CharString cvalueName(valueName);
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UnicodeSet* set = new UnicodeSet();
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char* end;
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double value = uprv_strtod(cvalueName, &end);
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int32_t ivalue = (int32_t) value;
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if (ivalue != value || ivalue < 0 || *end != 0) {
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// UCharacter doesn't support negative or non-integral
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// values, so just return an empty set
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return set;
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}
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initSetFromFilter(*set, _numericValueFilter, &ivalue);
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return set;
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}
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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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UnicodeSet* UnicodePropertySet::createCategorySet(const UnicodeString& valueName) {
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int32_t valueCode = CATEGORY_MAP->geti(valueName);
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if (valueCode == 0) {
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return NULL;
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}
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UnicodeSet* set = new UnicodeSet();
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if (valueCode == ANY) {
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set->complement();
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return set;
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}
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for (int32_t cat=0; cat<U_CHAR_CATEGORY_COUNT; ++cat) {
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if ((valueCode & (1 << cat)) != 0) {
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set->addAll(getCategorySet(cat));
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}
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}
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return set;
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}
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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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UnicodeSet* UnicodePropertySet::createScriptSet(const UnicodeString& valueName) {
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_CharString cvalueName(valueName);
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UErrorCode ec = U_ZERO_ERROR;
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const int32_t capacity = 10;
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UScriptCode script[capacity]={USCRIPT_INVALID_CODE};
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int32_t num = uscript_getCode(cvalueName,script,capacity, &ec);
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if (script[0] == USCRIPT_INVALID_CODE || U_FAILURE(ec)) {
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// Syntax error; unknown short name
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return NULL;
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}
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return new UnicodeSet(getScriptSet(script[0]));
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}
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//----------------------------------------------------------------
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// Utility methods
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//----------------------------------------------------------------
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static UBool _categoryFilter(UChar32 c, void* context) {
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int32_t value = * (int32_t*) context;
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return u_charType(c) == value;
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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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const UnicodeSet& UnicodePropertySet::getCategorySet(int32_t cat) {
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if (CATEGORY_CACHE[cat].isEmpty()) {
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initSetFromFilter(CATEGORY_CACHE[cat], _categoryFilter, &cat);
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}
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return CATEGORY_CACHE[cat];
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}
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static UBool _scriptFilter(UChar32 c, void* context) {
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UScriptCode value = * (UScriptCode*) context;
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UErrorCode ec = U_ZERO_ERROR;
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return uscript_getScript(c, &ec) == value;
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}
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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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const UnicodeSet& UnicodePropertySet::getScriptSet(UScriptCode script) {
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if (SCRIPT_CACHE[script].isEmpty()) {
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initSetFromFilter(SCRIPT_CACHE[script], _scriptFilter, &script);
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}
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return SCRIPT_CACHE[script];
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}
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/**
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* Given a string, munge it to lost the whitespace. So "General
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* Category " becomes "GeneralCategory". We munge all type and value
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* strings, and store all type and value keys pre-munged. NOTE:
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* Unlike the Java version, we do not modify the case, since we use a
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* case-insensitive compare function.
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*/
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UnicodeString UnicodePropertySet::munge(const UnicodeString& str,
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int32_t start, int32_t limit) {
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UnicodeString buf;
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for (int32_t i=start; i<limit; ) {
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UChar32 c = str.char32At(i);
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i += UTF_CHAR_LENGTH(c);
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if (!u_isspace(c)) {
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buf.append(c);
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}
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}
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return buf;
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}
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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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int32_t UnicodePropertySet::skipWhitespace(const UnicodeString& str,
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int32_t pos) {
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while (pos < str.length()) {
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UChar32 c = str.char32At(pos);
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if (!u_isspace(c)) {
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break;
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}
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pos += UTF_CHAR_LENGTH(c);
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}
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return pos;
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}
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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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void UnicodePropertySet::initSetFromFilter(UnicodeSet& set, Filter filter,
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void* context) {
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// Walk through all Unicode characters, noting the start
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// and end of each range for which filter.contain(c) is
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// true. Add each range to a set.
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set.clear();
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int32_t start = -1;
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int32_t end = -2;
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// TODO Extend this up to UnicodeSet.MAX_VALUE when we have
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// better performance; i.e., when this code can get moved into
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// the UCharacter class and not have to iterate over code
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// points. Right now it's way too slow to iterate to 10FFFF.
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for (int32_t i=UnicodeSet::MIN_VALUE; i<=0xFFFF/*TEMPORARY*/; ++i) {
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if ((*filter)((UChar32) i, context)) {
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if ((end+1) == i) {
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end = i;
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} else {
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if (start >= 0) {
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set.add((UChar32)start, (UChar32)end);
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}
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start = end = i;
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}
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}
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}
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if (start >= 0) {
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set.add((UChar32)start, (UChar32)end);
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}
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}
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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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void UnicodePropertySet::addType(const UnicodeString& shortName,
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const UnicodeString& longName,
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SetFactory factory) {
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UErrorCode ec = U_ZERO_ERROR;
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void* p = setFactoryToVoidPtr(factory);
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NAME_MAP->put(shortName, p, ec);
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NAME_MAP->put(longName, p, ec);
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}
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/**
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* Add a value mapping to the name map.
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*/
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void UnicodePropertySet::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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// assert(value != 0);
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UErrorCode ec = U_ZERO_ERROR;
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map->puti(shortName, value, ec);
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if (longName.length() != 0) {
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map->puti(longName, value, ec);
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}
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}
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void UnicodePropertySet::init() {
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if (NAME_MAP != NULL) {
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return;
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}
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NAME_MAP = new Hashtable(TRUE);
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CATEGORY_MAP = new Hashtable(TRUE);
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CATEGORY_CACHE = new UnicodeSet[U_CHAR_CATEGORY_COUNT];
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SCRIPT_CACHE = new UnicodeSet[USCRIPT_CODE_LIMIT];
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// NOTE: We munge all search keys to have no whitespace
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// and upper case. As such, all stored keys should have
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// this format.
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// Load the map with type data
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addType("GC", "GENERALCATEGORY", createCategorySet);
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//addType("CC", "COMBININGCLASS", COMBINING_CLASS);
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//addType("BC", "BIDICLASS", BIDI_CLASS);
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//addType("DT", "DECOMPOSITIONTYPE", DECOMPOSITION_TYPE);
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addType("NV", "NUMERICVALUE", createNumericValueSet);
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//addType("NT", "NUMERICTYPE", NUMERIC_TYPE);
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//addType("EA", "EASTASIANWIDTH", EAST_ASIAN_WIDTH);
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//addType("LB", "LINEBREAK", LINE_BREAK);
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//addType("JT", "JOININGTYPE", JOINING_TYPE);
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addType("SC", "SCRIPT", createScriptSet);
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// Load the map with value data
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// General Category
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addValue(CATEGORY_MAP, "ANY", "", ANY); // special case
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addValue(CATEGORY_MAP, "C", "OTHER",
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(1 << U_CONTROL_CHAR) |
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(1 << U_FORMAT_CHAR) |
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(1 << U_GENERAL_OTHER_TYPES) |
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(1 << U_PRIVATE_USE_CHAR) |
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(1 << U_SURROGATE));
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addValue(CATEGORY_MAP, "CC", "CONTROL",
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1 << U_CONTROL_CHAR);
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addValue(CATEGORY_MAP, "CF", "FORMAT",
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1 << U_FORMAT_CHAR);
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addValue(CATEGORY_MAP, "CN", "UNASSIGNED",
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1 << U_GENERAL_OTHER_TYPES);
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addValue(CATEGORY_MAP, "CO", "PRIVATEUSE",
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1 << U_PRIVATE_USE_CHAR);
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addValue(CATEGORY_MAP, "CS", "SURROGATE",
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1 << U_SURROGATE);
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addValue(CATEGORY_MAP, "L", "LETTER",
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(1 << U_LOWERCASE_LETTER) |
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(1 << U_MODIFIER_LETTER) |
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(1 << U_OTHER_LETTER) |
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(1 << U_TITLECASE_LETTER) |
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(1 << U_UPPERCASE_LETTER));
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addValue(CATEGORY_MAP, "LL", "LOWERCASELETTER",
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1 << U_LOWERCASE_LETTER);
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addValue(CATEGORY_MAP, "LM", "MODIFIERLETTER",
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1 << U_MODIFIER_LETTER);
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addValue(CATEGORY_MAP, "LO", "OTHERLETTER",
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1 << U_OTHER_LETTER);
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addValue(CATEGORY_MAP, "LT", "TITLECASELETTER",
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1 << U_TITLECASE_LETTER);
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addValue(CATEGORY_MAP, "LU", "UPPERCASELETTER",
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1 << U_UPPERCASE_LETTER);
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addValue(CATEGORY_MAP, "M", "MARK",
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(1 << U_NON_SPACING_MARK) |
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|
(1 << U_COMBINING_SPACING_MARK) |
|
|
(1 << U_ENCLOSING_MARK));
|
|
|
|
addValue(CATEGORY_MAP, "MN", "NONSPACINGMARK",
|
|
1 << U_NON_SPACING_MARK);
|
|
addValue(CATEGORY_MAP, "MC", "SPACINGMARK",
|
|
1 << U_COMBINING_SPACING_MARK);
|
|
addValue(CATEGORY_MAP, "ME", "ENCLOSINGMARK",
|
|
1 << U_ENCLOSING_MARK);
|
|
|
|
addValue(CATEGORY_MAP, "N", "NUMBER",
|
|
(1 << U_DECIMAL_DIGIT_NUMBER) |
|
|
(1 << U_LETTER_NUMBER) |
|
|
(1 << U_OTHER_NUMBER));
|
|
|
|
addValue(CATEGORY_MAP, "ND", "DECIMALNUMBER",
|
|
1 << U_DECIMAL_DIGIT_NUMBER);
|
|
addValue(CATEGORY_MAP, "NL", "LETTERNUMBER",
|
|
1 << U_LETTER_NUMBER);
|
|
addValue(CATEGORY_MAP, "NO", "OTHERNUMBER",
|
|
1 << U_OTHER_NUMBER);
|
|
|
|
addValue(CATEGORY_MAP, "P", "PUNCTUATION",
|
|
(1 << U_CONNECTOR_PUNCTUATION) |
|
|
(1 << U_DASH_PUNCTUATION) |
|
|
(1 << U_END_PUNCTUATION) |
|
|
(1 << U_FINAL_PUNCTUATION) |
|
|
(1 << U_INITIAL_PUNCTUATION) |
|
|
(1 << U_OTHER_PUNCTUATION) |
|
|
(1 << U_START_PUNCTUATION));
|
|
|
|
addValue(CATEGORY_MAP, "PC", "CONNECTORPUNCTUATION",
|
|
1 << U_CONNECTOR_PUNCTUATION);
|
|
addValue(CATEGORY_MAP, "PD", "DASHPUNCTUATION",
|
|
1 << U_DASH_PUNCTUATION);
|
|
addValue(CATEGORY_MAP, "PE", "ENDPUNCTUATION",
|
|
1 << U_END_PUNCTUATION);
|
|
addValue(CATEGORY_MAP, "PF", "FINALPUNCTUATION",
|
|
1 << U_FINAL_PUNCTUATION);
|
|
addValue(CATEGORY_MAP, "PI", "INITIALPUNCTUATION",
|
|
1 << U_INITIAL_PUNCTUATION);
|
|
addValue(CATEGORY_MAP, "PO", "OTHERPUNCTUATION",
|
|
1 << U_OTHER_PUNCTUATION);
|
|
addValue(CATEGORY_MAP, "PS", "STARTPUNCTUATION",
|
|
1 << U_START_PUNCTUATION);
|
|
|
|
addValue(CATEGORY_MAP, "S", "SYMBOL",
|
|
(1 << U_CURRENCY_SYMBOL) |
|
|
(1 << U_MODIFIER_SYMBOL) |
|
|
(1 << U_MATH_SYMBOL) |
|
|
(1 << U_OTHER_SYMBOL));
|
|
|
|
addValue(CATEGORY_MAP, "SC", "CURRENCYSYMBOL",
|
|
1 << U_CURRENCY_SYMBOL);
|
|
addValue(CATEGORY_MAP, "SK", "MODIFIERSYMBOL",
|
|
1 << U_MODIFIER_SYMBOL);
|
|
addValue(CATEGORY_MAP, "SM", "MATHSYMBOL",
|
|
1 << U_MATH_SYMBOL);
|
|
addValue(CATEGORY_MAP, "SO", "OTHERSYMBOL",
|
|
1 << U_OTHER_SYMBOL);
|
|
|
|
addValue(CATEGORY_MAP, "Z", "SEPARATOR",
|
|
(1 << U_LINE_SEPARATOR) |
|
|
(1 << U_PARAGRAPH_SEPARATOR) |
|
|
(1 << U_SPACE_SEPARATOR));
|
|
|
|
addValue(CATEGORY_MAP, "ZL", "LINESEPARATOR",
|
|
1 << U_LINE_SEPARATOR);
|
|
addValue(CATEGORY_MAP, "ZP", "PARAGRAPHSEPARATOR",
|
|
1 << U_PARAGRAPH_SEPARATOR);
|
|
addValue(CATEGORY_MAP, "ZS", "SPACESEPARATOR",
|
|
1 << U_SPACE_SEPARATOR);
|
|
}
|
|
|
|
void UnicodePropertySet::cleanup() {
|
|
if (NAME_MAP != NULL) {
|
|
delete NAME_MAP; NAME_MAP = NULL;
|
|
delete CATEGORY_MAP; CATEGORY_MAP = NULL;
|
|
delete[] CATEGORY_CACHE; CATEGORY_CACHE = NULL;
|
|
delete[] SCRIPT_CACHE; SCRIPT_CACHE = NULL;
|
|
}
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
//eof
|