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scuffed-code/icu4c/source/common/caniter.cpp
Markus Scherer 6b1fa6036a ICU-2150 simplify/improve UTF macros 
X-SVN-Rev: 9930
2002-09-30 04:00:17 +00:00

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/*
*****************************************************************************
* Copyright (C) 1996-2002, International Business Machines Corporation and *
* others. All Rights Reserved. *
*****************************************************************************
*/
#include "unicode/uset.h"
#include "unicode/ustring.h"
#include "hash.h"
#include "unormimp.h"
#include "unicode/caniter.h"
#include "unicode/normlzr.h"
#include "unicode/uchar.h"
#include "cmemory.h"
/**
* This class allows one to iterate through all the strings that are canonically equivalent to a given
* string. For example, here are some sample results:
Results for: {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
1: \u0041\u030A\u0064\u0307\u0327
= {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
2: \u0041\u030A\u0064\u0327\u0307
= {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
3: \u0041\u030A\u1E0B\u0327
= {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
4: \u0041\u030A\u1E11\u0307
= {LATIN CAPITAL LETTER A}{COMBINING RING ABOVE}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
5: \u00C5\u0064\u0307\u0327
= {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
6: \u00C5\u0064\u0327\u0307
= {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
7: \u00C5\u1E0B\u0327
= {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
8: \u00C5\u1E11\u0307
= {LATIN CAPITAL LETTER A WITH RING ABOVE}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
9: \u212B\u0064\u0307\u0327
= {ANGSTROM SIGN}{LATIN SMALL LETTER D}{COMBINING DOT ABOVE}{COMBINING CEDILLA}
10: \u212B\u0064\u0327\u0307
= {ANGSTROM SIGN}{LATIN SMALL LETTER D}{COMBINING CEDILLA}{COMBINING DOT ABOVE}
11: \u212B\u1E0B\u0327
= {ANGSTROM SIGN}{LATIN SMALL LETTER D WITH DOT ABOVE}{COMBINING CEDILLA}
12: \u212B\u1E11\u0307
= {ANGSTROM SIGN}{LATIN SMALL LETTER D WITH CEDILLA}{COMBINING DOT ABOVE}
*<br>Note: the code is intended for use with small strings, and is not suitable for larger ones,
* since it has not been optimized for that situation.
*@author M. Davis
*@draft
*/
#if 0
static UBool PROGRESS = FALSE;
#include <stdio.h>
#include "unicode/translit.h"
UErrorCode status = U_ZERO_ERROR;
// Just for testing - remove, not thread safe.
static const char* UToS(const UnicodeString &source) {
static char buffer[256];
buffer[source.extract(0, source.length(), buffer)] = 0;
return buffer;
}
static const UnicodeString &Tr(const UnicodeString &source) {
static Transliterator *NAME = Transliterator::createInstance("name", UTRANS_FORWARD, status);
static UnicodeString result;
result = source;
NAME->transliterate(result);
return result;
}
#endif
// public
U_NAMESPACE_BEGIN
// TODO: add boilerplate methods.
const char CanonicalIterator::fgClassID=0;
/**
*@param source string to get results for
*/
CanonicalIterator::CanonicalIterator(const UnicodeString &sourceStr, UErrorCode &status) :
pieces(NULL),
pieces_length(0),
pieces_lengths(NULL),
current(NULL),
current_length(0)
{
if(U_SUCCESS(status)) {
setSource(sourceStr, status);
}
}
CanonicalIterator::~CanonicalIterator() {
cleanPieces();
}
void CanonicalIterator::cleanPieces() {
int32_t i = 0;
if(pieces != NULL) {
for(i = 0; i < pieces_length; i++) {
if(pieces[i] != NULL) {
delete[] pieces[i];
}
}
uprv_free(pieces);
pieces = NULL;
if(pieces_lengths != NULL) {
uprv_free(pieces_lengths);
}
pieces_lengths = NULL;
if(current != NULL) {
uprv_free(current);
}
current = NULL;
}
}
/**
*@return gets the source: NOTE: it is the NFD form of source
*/
UnicodeString CanonicalIterator::getSource() {
return source;
}
/**
* Resets the iterator so that one can start again from the beginning.
*/
void CanonicalIterator::reset() {
done = FALSE;
for (int i = 0; i < current_length; ++i) {
current[i] = 0;
}
}
/**
*@return the next string that is canonically equivalent. The value null is returned when
* the iteration is done.
*/
UnicodeString CanonicalIterator::next() {
int32_t i = 0;
buffer.truncate(0); //buffer.setLength(0); // delete old contents
if (done) {
buffer.setToBogus();
return buffer;
}
// construct return value
for (i = 0; i < pieces_length; ++i) {
buffer.append(pieces[i][current[i]]);
}
//String result = buffer.toString(); // not needed
// find next value for next time
for (i = current_length - 1; ; --i) {
if (i < 0) {
done = TRUE;
break;
}
current[i]++;
if (current[i] < pieces_lengths[i]) break; // got sequence
current[i] = 0;
}
return buffer;
}
/**
*@param set the source string to iterate against. This allows the same iterator to be used
* while changing the source string, saving object creation.
*/
void CanonicalIterator::setSource(const UnicodeString &newSource, UErrorCode &status) {
if(U_FAILURE(status)) {
return;
}
Normalizer::normalize(newSource, UNORM_NFD, 0, source, status);
done = FALSE;
cleanPieces();
// catch degenerate case
if (newSource.length() == 0) {
pieces_length = 1;
pieces = (UnicodeString **)uprv_malloc(sizeof(UnicodeString *));
/* test for NULL */
if (pieces == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
current_length = 1;
current = (int32_t*)uprv_malloc(1 * sizeof(int32_t));
/* test for NULL */
if (current == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
uprv_free(pieces);
pieces = NULL;
return;
}
current[0] = 0;
pieces[0] = new UnicodeString[1];
/* test for NULL */
if (pieces[0] == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
uprv_free(pieces);
pieces = NULL;
uprv_free(current);
return;
}
pieces[0][0] = UnicodeString("");
pieces_lengths = (int32_t*)uprv_malloc(1 * sizeof(int32_t));
/* test for NULL */
if (pieces_lengths == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
uprv_free(pieces);
pieces = NULL;
uprv_free(current);
return;
}
pieces_lengths[0] = 1;
return;
}
UnicodeString *list = new UnicodeString[source.length()];
/* test for NULL */
if (list == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
int32_t list_length = 0;
UChar32 cp = 0;
int32_t start = 0;
// i should initialy be the number of code units at the
// start of the string
int32_t i = UTF16_CHAR_LENGTH(source.char32At(0));
//int32_t i = 1;
// find the segments
// This code iterates through the source string and
// extracts segments that end up on a codepoint that
// doesn't start any decompositions. (Analysis is done
// on the NFD form - see above).
for (; i < source.length(); i += UTF16_CHAR_LENGTH(cp)) {
cp = source.char32At(i);
if (unorm_isCanonSafeStart(cp)) {
source.extract(start, i-start, list[list_length++]); // add up to i
start = i;
}
}
source.extract(start, i-start, list[list_length++]); // add last one
// allocate the arrays, and find the strings that are CE to each segment
pieces = (UnicodeString **)uprv_malloc(list_length * sizeof(UnicodeString *));
/* test for NULL */
if (pieces == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
delete[] list;
return;
}
pieces_length = list_length;
pieces_lengths = (int32_t*)uprv_malloc(list_length * sizeof(int32_t));
/* test for NULL */
if (pieces_lengths == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
delete[] list;
uprv_free(pieces);
pieces = NULL;
return;
}
current_length = list_length;
current = (int32_t*)uprv_malloc(list_length * sizeof(int32_t));
/* test for NULL */
if (current == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
delete[] list;
uprv_free(pieces);
pieces = NULL;
uprv_free(pieces_lengths);
return;
}
for (i = 0; i < current_length; i++) {
current[i] = 0;
}
// for each segment, get all the combinations that can produce
// it after NFD normalization
for (i = 0; i < pieces_length; ++i) {
//if (PROGRESS) printf("SEGMENT\n");
pieces[i] = getEquivalents(list[i], pieces_lengths[i], status);
}
delete[] list;
}
/**
* Dumb recursive implementation of permutation.
* TODO: optimize
* @param source the string to find permutations for
* @return the results in a set.
*/
void CanonicalIterator::permute(UnicodeString &source, UBool skipZeros, Hashtable *result, UErrorCode &status) {
if(U_FAILURE(status)) {
return;
}
//if (PROGRESS) printf("Permute: %s\n", UToS(Tr(source)));
int32_t i = 0;
// optimization:
// if zero or one character, just return a set with it
// we check for length < 2 to keep from counting code points all the time
if (source.length() <= 2 && source.countChar32() <= 1) {
UnicodeString *toPut = new UnicodeString(source);
/* test for NULL */
if (toPut == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
result->put(source, toPut, status);
return;
}
// otherwise iterate through the string, and recursively permute all the other characters
UChar32 cp;
Hashtable *subpermute = new Hashtable(FALSE, status);
/* test for NULL */
if (subpermute == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
return;
}
if (U_SUCCESS(status)) {
subpermute->setValueDeleter(uhash_deleteUnicodeString);
}
for (i = 0; i < source.length(); i += UTF16_CHAR_LENGTH(cp)) {
cp = source.char32At(i);
const UHashElement *ne = NULL;
int32_t el = -1;
UnicodeString subPermuteString = source;
// optimization:
// if the character is canonical combining class zero,
// don't permute it
if (skipZeros && i != 0 && u_getCombiningClass(cp) == 0) {
//System.out.println("Skipping " + Utility.hex(UTF16.valueOf(source, i)));
continue;
}
subpermute->removeAll();
// see what the permutations of the characters before and after this one are
//Hashtable *subpermute = permute(source.substring(0,i) + source.substring(i + UTF16.getCharCount(cp)));
permute(subPermuteString.replace(i, UTF16_CHAR_LENGTH(cp), NULL, 0), skipZeros, subpermute, status);
/* Test for buffer overflows */
if(U_FAILURE(status)) {
delete subpermute;
return;
}
// The upper replace is destructive. The question is do we have to make a copy, or we don't care about the contents
// of source at this point.
// prefix this character to all of them
ne = subpermute->nextElement(el);
while (ne != NULL) {
UnicodeString *permRes = (UnicodeString *)(ne->value.pointer);
UnicodeString *chStr = new UnicodeString(cp);
//test for NULL
if (chStr == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
delete subpermute;
return;
}
chStr->append(*permRes); //*((UnicodeString *)(ne->value.pointer));
//if (PROGRESS) printf(" Piece: %s\n", UToS(*chStr));
result->put(*chStr, chStr, status);
ne = subpermute->nextElement(el);
}
}
delete subpermute;
//return result;
}
// privates
// we have a segment, in NFD. Find all the strings that are canonically equivalent to it.
UnicodeString* CanonicalIterator::getEquivalents(const UnicodeString &segment, int32_t &result_len, UErrorCode &status) {
//private String[] getEquivalents(String segment)
Hashtable *result = new Hashtable(FALSE, status);
/* test for NULL */
if (result == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
return 0;
}
if (U_SUCCESS(status)) {
result->setValueDeleter(uhash_deleteUnicodeString);
}
UChar USeg[256];
int32_t segLen = segment.extract(USeg, 256, status);
Hashtable *basic = getEquivalents2(USeg, segLen, status);
//Hashtable *basic = getEquivalents2(segment, segLen, status);
// now get all the permutations
// add only the ones that are canonically equivalent
// TODO: optimize by not permuting any class zero.
Hashtable *permutations = new Hashtable(FALSE, status);
/* test for NULL */
if (permutations == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
delete result;
delete basic;
return 0;
}
if (U_SUCCESS(status)) {
permutations->setValueDeleter(uhash_deleteUnicodeString);
}
const UHashElement *ne = NULL;
int32_t el = -1;
//Iterator it = basic.iterator();
ne = basic->nextElement(el);
//while (it.hasNext())
while (ne != NULL) {
//String item = (String) it.next();
UnicodeString item = *((UnicodeString *)(ne->value.pointer));
permutations->removeAll();
permute(item, SKIP_ZEROES, permutations, status);
const UHashElement *ne2 = NULL;
int32_t el2 = -1;
//Iterator it2 = permutations.iterator();
ne2 = permutations->nextElement(el2);
//while (it2.hasNext())
while (ne2 != NULL) {
//String possible = (String) it2.next();
//UnicodeString *possible = new UnicodeString(*((UnicodeString *)(ne2->value.pointer)));
UnicodeString possible(*((UnicodeString *)(ne2->value.pointer)));
UnicodeString attempt;
Normalizer::normalize(possible, UNORM_NFD, 0, attempt, status);
// TODO: check if operator == is semanticaly the same as attempt.equals(segment)
if (attempt==segment) {
//if (PROGRESS) printf("Adding Permutation: %s\n", UToS(Tr(*possible)));
// TODO: use the hashtable just to catch duplicates - store strings directly (somehow).
result->put(possible, new UnicodeString(possible), status); //add(possible);
} else {
//if (PROGRESS) printf("-Skipping Permutation: %s\n", UToS(Tr(*possible)));
}
ne2 = permutations->nextElement(el2);
}
ne = basic->nextElement(el);
}
/* Test for buffer overflows */
if(U_FAILURE(status)) {
delete result;
delete permutations;
delete basic;
return 0;
}
// convert into a String[] to clean up storage
//String[] finalResult = new String[result.size()];
UnicodeString *finalResult = new UnicodeString[result->count()];
/* test for NULL */
if (finalResult == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
delete result;
delete permutations;
delete basic;
return 0;
}
//result.toArray(finalResult);
result_len = 0;
el = -1;
ne = result->nextElement(el);
while(ne != NULL) {
UnicodeString finResult = *((UnicodeString *)(ne->value.pointer));
finalResult[result_len++] = finResult;
ne = result->nextElement(el);
}
delete permutations;
delete basic;
delete result;
return finalResult;
}
Hashtable *CanonicalIterator::getEquivalents2(const UChar *segment, int32_t segLen, UErrorCode &status) {
//Hashtable *CanonicalIterator::getEquivalents2(const UnicodeString &segment, int32_t segLen, UErrorCode &status) {
Hashtable *result = new Hashtable(FALSE, status);
/* test for NULL */
if (result == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
return 0;
}
if (U_SUCCESS(status)) {
result->setValueDeleter(uhash_deleteUnicodeString);
}
//if (PROGRESS) printf("Adding: %s\n", UToS(Tr(segment)));
UnicodeString toPut(segment, segLen);
result->put(toPut, new UnicodeString(toPut), status);
USerializedSet starts;
// cycle through all the characters
UChar32 cp, end = 0;
int32_t i = 0, j;
for (i = 0; i < segLen; i += UTF16_CHAR_LENGTH(cp)) {
// see if any character is at the start of some decomposition
UTF_GET_CHAR(segment, 0, i, segLen, cp);
if (!unorm_getCanonStartSet(cp, &starts)) {
continue;
}
// if so, see which decompositions match
for(j = 0, cp = end+1; cp <= end || uset_getSerializedRange(&starts, j++, &cp, &end); ++cp) {
//Hashtable *remainder = extract(cp, segment, segLen, i, status);
Hashtable *remainder = extract(cp, segment, segLen, i, status);
if (remainder == NULL) continue;
// there were some matches, so add all the possibilities to the set.
UnicodeString prefix(segment, i);
prefix += cp;
const UHashElement *ne = NULL;
int32_t el = -1;
ne = remainder->nextElement(el);
while (ne != NULL) {
UnicodeString item = *((UnicodeString *)(ne->value.pointer));
UnicodeString *toAdd = new UnicodeString(prefix);
/* test for NULL */
if (toAdd == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
delete result;
delete remainder;
return 0;
}
*toAdd += item;
result->put(*toAdd, toAdd, status);
//if (PROGRESS) printf("Adding: %s\n", UToS(Tr(*toAdd)));
ne = remainder->nextElement(el);
}
delete remainder;
}
}
/* Test for buffer overflows */
if(U_FAILURE(status)) {
return 0;
}
return result;
}
/**
* See if the decomposition of cp2 is at segment starting at segmentPos
* (with canonical rearrangment!)
* If so, take the remainder, and return the equivalents
*/
Hashtable *CanonicalIterator::extract(UChar32 comp, const UChar *segment, int32_t segLen, int32_t segmentPos, UErrorCode &status) {
//Hashtable *CanonicalIterator::extract(UChar32 comp, const UnicodeString &segment, int32_t segLen, int32_t segmentPos, UErrorCode &status) {
//if (PROGRESS) printf(" extract: %s, ", UToS(Tr(UnicodeString(comp))));
//if (PROGRESS) printf("%s, %i\n", UToS(Tr(segment)), segmentPos);
const int32_t bufSize = 256;
int32_t bufLen = 0;
UChar temp[bufSize];
const int32_t decompSize = 64;
int32_t inputLen = 0;
UChar decomp[decompSize];
U16_APPEND_UNSAFE(temp, inputLen, comp);
int32_t decompLen = unorm_getDecomposition(comp, FALSE, decomp, decompSize);
if(decompLen < 0) {
decompLen = -decompLen;
}
UChar *buff = temp+inputLen;
// See if it matches the start of segment (at segmentPos)
UBool ok = FALSE;
UChar32 cp;
int32_t decompPos = 0;
UChar32 decompCp;
UTF_NEXT_CHAR(decomp, decompPos, decompLen, decompCp);
int32_t i;
UBool overflow = FALSE;
i = segmentPos;
while(i < segLen) {
UTF_NEXT_CHAR(segment, i, segLen, cp);
if (cp == decompCp) { // if equal, eat another cp from decomp
//if (PROGRESS) printf(" matches: %s\n", UToS(Tr(UnicodeString(cp))));
if (decompPos == decompLen) { // done, have all decomp characters!
//u_strcat(buff+bufLen, segment+i);
memcpy(buff+bufLen, segment+i, (segLen-i)*sizeof(UChar));
bufLen+=segLen-i;
ok = TRUE;
break;
}
UTF_NEXT_CHAR(decomp, decompPos, decompLen, decompCp);
} else {
//if (PROGRESS) printf(" buffer: %s\n", UToS(Tr(UnicodeString(cp))));
// brute force approach
U16_APPEND(buff, bufLen, bufSize, cp, overflow);
if(overflow) {
/*
* ### TODO handle buffer overflow
* The buffer is large, but an overflow may still happen with
* unusual input (many combining marks?).
* Reallocate buffer and continue.
* markus 20020929
*/
overflow = FALSE;
}
/* TODO: optimize
// since we know that the classes are monotonically increasing, after zero
// e.g. 0 5 7 9 0 3
// we can do an optimization
// there are only a few cases that work: zero, less, same, greater
// if both classes are the same, we fail
// if the decomp class < the segment class, we fail
segClass = getClass(cp);
if (decompClass <= segClass) return null;
*/
}
}
if (!ok) return NULL; // we failed, characters left over
//if (PROGRESS) printf("Matches\n");
if (bufLen == 0) {
Hashtable *result = new Hashtable(FALSE, status);
/* test for NULL */
if (result == 0) {
status = U_MEMORY_ALLOCATION_ERROR;
return 0;
}
result->setValueDeleter(uhash_deleteUnicodeString);
result->put("", new UnicodeString(""), status);
return result; // succeed, but no remainder
}
// brute force approach
// check to make sure result is canonically equivalent
int32_t tempLen = inputLen + bufLen;
UChar trial[bufSize];
unorm_decompose(trial, bufSize, temp, tempLen, FALSE, FALSE, &status);
/* Test for buffer overflows */
if(U_FAILURE(status)) {
return 0;
}
if(uprv_memcmp(segment+segmentPos, trial, (segLen - segmentPos)*sizeof(UChar)) != 0) {
return NULL;
}
return getEquivalents2(buff, bufLen, status);
}
U_NAMESPACE_END
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