510 lines
18 KiB
C++
510 lines
18 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 2001-2008 IBM and others. All rights reserved.
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**********************************************************************
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* Date Name Description
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* 03/22/2000 helena Creation.
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**********************************************************************
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_COLLATION && !UCONFIG_NO_BREAK_ITERATION
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#include "unicode/stsearch.h"
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#include "usrchimp.h"
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#include "cmemory.h"
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(StringSearch)
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// public constructors and destructors -----------------------------------
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StringSearch::StringSearch(const UnicodeString &pattern,
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const UnicodeString &text,
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const Locale &locale,
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BreakIterator *breakiter,
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UErrorCode &status) :
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SearchIterator(text, breakiter),
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m_collator_(),
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m_pattern_(pattern)
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{
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if (U_FAILURE(status)) {
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m_strsrch_ = NULL;
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return;
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}
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m_strsrch_ = usearch_open(m_pattern_.getBuffer(), m_pattern_.length(),
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m_text_.getBuffer(), m_text_.length(),
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locale.getName(), (UBreakIterator *)breakiter,
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&status);
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uprv_free(m_search_);
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m_search_ = NULL;
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// !!! dlf m_collator_ is an odd beast. basically it is an aliasing
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// wrapper around the internal collator and rules, which (here) are
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// owned by this stringsearch object. this means 1) it's destructor
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// _should not_ delete the ucollator or rules, and 2) changes made
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// to the exposed collator (setStrength etc) _should_ modify the
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// ucollator. thus the collator is not a copy-on-write alias, and it
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// needs to distinguish itself not merely from 'stand alone' colators
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// but also from copy-on-write ones. it needs additional state, which
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// setUCollator should set.
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if (U_SUCCESS(status)) {
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// Alias the collator
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m_collator_.setUCollator((UCollator *)m_strsrch_->collator);
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// m_search_ has been created by the base SearchIterator class
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m_search_ = m_strsrch_->search;
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}
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}
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StringSearch::StringSearch(const UnicodeString &pattern,
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const UnicodeString &text,
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RuleBasedCollator *coll,
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BreakIterator *breakiter,
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UErrorCode &status) :
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SearchIterator(text, breakiter),
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m_collator_(),
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m_pattern_(pattern)
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{
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if (U_FAILURE(status)) {
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m_strsrch_ = NULL;
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return;
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}
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if (coll == NULL) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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m_strsrch_ = NULL;
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return;
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}
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m_strsrch_ = usearch_openFromCollator(m_pattern_.getBuffer(),
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m_pattern_.length(),
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m_text_.getBuffer(),
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m_text_.length(), coll->ucollator,
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(UBreakIterator *)breakiter,
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&status);
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uprv_free(m_search_);
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m_search_ = NULL;
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if (U_SUCCESS(status)) {
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// Alias the collator
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m_collator_.setUCollator((UCollator *)m_strsrch_->collator);
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// m_search_ has been created by the base SearchIterator class
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m_search_ = m_strsrch_->search;
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}
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}
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StringSearch::StringSearch(const UnicodeString &pattern,
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CharacterIterator &text,
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const Locale &locale,
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BreakIterator *breakiter,
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UErrorCode &status) :
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SearchIterator(text, breakiter),
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m_collator_(),
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m_pattern_(pattern)
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{
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if (U_FAILURE(status)) {
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m_strsrch_ = NULL;
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return;
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}
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m_strsrch_ = usearch_open(m_pattern_.getBuffer(), m_pattern_.length(),
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m_text_.getBuffer(), m_text_.length(),
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locale.getName(), (UBreakIterator *)breakiter,
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&status);
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uprv_free(m_search_);
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m_search_ = NULL;
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if (U_SUCCESS(status)) {
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// Alias the collator
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m_collator_.setUCollator((UCollator *)m_strsrch_->collator);
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// m_search_ has been created by the base SearchIterator class
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m_search_ = m_strsrch_->search;
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}
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}
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StringSearch::StringSearch(const UnicodeString &pattern,
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CharacterIterator &text,
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RuleBasedCollator *coll,
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BreakIterator *breakiter,
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UErrorCode &status) :
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SearchIterator(text, breakiter),
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m_collator_(),
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m_pattern_(pattern)
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{
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if (U_FAILURE(status)) {
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m_strsrch_ = NULL;
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return;
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}
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if (coll == NULL) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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m_strsrch_ = NULL;
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return;
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}
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m_strsrch_ = usearch_openFromCollator(m_pattern_.getBuffer(),
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m_pattern_.length(),
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m_text_.getBuffer(),
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m_text_.length(), coll->ucollator,
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(UBreakIterator *)breakiter,
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&status);
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uprv_free(m_search_);
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m_search_ = NULL;
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if (U_SUCCESS(status)) {
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// Alias the collator
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m_collator_.setUCollator((UCollator *)m_strsrch_->collator);
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// m_search_ has been created by the base SearchIterator class
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m_search_ = m_strsrch_->search;
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}
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}
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StringSearch::StringSearch(const StringSearch &that) :
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SearchIterator(that.m_text_, that.m_breakiterator_),
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m_collator_(),
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m_pattern_(that.m_pattern_)
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{
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UErrorCode status = U_ZERO_ERROR;
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// Free m_search_ from the superclass
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uprv_free(m_search_);
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m_search_ = NULL;
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if (that.m_strsrch_ == NULL) {
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// This was not a good copy
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m_strsrch_ = NULL;
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}
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else {
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// Make a deep copy
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m_strsrch_ = usearch_openFromCollator(m_pattern_.getBuffer(),
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m_pattern_.length(),
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m_text_.getBuffer(),
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m_text_.length(),
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that.m_strsrch_->collator,
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(UBreakIterator *)that.m_breakiterator_,
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&status);
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if (U_SUCCESS(status)) {
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// Alias the collator
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m_collator_.setUCollator((UCollator *)m_strsrch_->collator);
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// m_search_ has been created by the base SearchIterator class
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m_search_ = m_strsrch_->search;
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}
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}
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}
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StringSearch::~StringSearch()
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{
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if (m_strsrch_ != NULL) {
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usearch_close(m_strsrch_);
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m_search_ = NULL;
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}
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}
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StringSearch *
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StringSearch::clone() const {
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return new StringSearch(*this);
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}
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// operator overloading ---------------------------------------------
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StringSearch & StringSearch::operator=(const StringSearch &that)
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{
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if ((*this) != that) {
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UErrorCode status = U_ZERO_ERROR;
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m_text_ = that.m_text_;
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m_breakiterator_ = that.m_breakiterator_;
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m_pattern_ = that.m_pattern_;
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// all m_search_ in the parent class is linked up with m_strsrch_
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usearch_close(m_strsrch_);
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m_strsrch_ = usearch_openFromCollator(m_pattern_.getBuffer(),
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m_pattern_.length(),
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m_text_.getBuffer(),
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m_text_.length(),
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that.m_strsrch_->collator,
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NULL, &status);
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// Check null pointer
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if (m_strsrch_ != NULL) {
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// Alias the collator
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m_collator_.setUCollator((UCollator *)m_strsrch_->collator);
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m_search_ = m_strsrch_->search;
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}
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}
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return *this;
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}
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UBool StringSearch::operator==(const SearchIterator &that) const
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{
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if (this == &that) {
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return TRUE;
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}
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if (SearchIterator::operator ==(that)) {
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StringSearch &thatsrch = (StringSearch &)that;
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return (this->m_pattern_ == thatsrch.m_pattern_ &&
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this->m_strsrch_->collator == thatsrch.m_strsrch_->collator);
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}
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return FALSE;
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}
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// public get and set methods ----------------------------------------
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void StringSearch::setOffset(int32_t position, UErrorCode &status)
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{
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// status checked in usearch_setOffset
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usearch_setOffset(m_strsrch_, position, &status);
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}
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int32_t StringSearch::getOffset(void) const
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{
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return usearch_getOffset(m_strsrch_);
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}
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void StringSearch::setText(const UnicodeString &text, UErrorCode &status)
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{
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if (U_SUCCESS(status)) {
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m_text_ = text;
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usearch_setText(m_strsrch_, text.getBuffer(), text.length(), &status);
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}
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}
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void StringSearch::setText(CharacterIterator &text, UErrorCode &status)
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{
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if (U_SUCCESS(status)) {
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text.getText(m_text_);
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usearch_setText(m_strsrch_, m_text_.getBuffer(), m_text_.length(), &status);
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}
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}
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RuleBasedCollator * StringSearch::getCollator() const
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{
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return (RuleBasedCollator *)&m_collator_;
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}
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void StringSearch::setCollator(RuleBasedCollator *coll, UErrorCode &status)
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{
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if (U_SUCCESS(status)) {
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usearch_setCollator(m_strsrch_, coll->getUCollator(), &status);
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// Alias the collator
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m_collator_.setUCollator((UCollator *)m_strsrch_->collator);
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}
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}
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void StringSearch::setPattern(const UnicodeString &pattern,
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UErrorCode &status)
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{
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if (U_SUCCESS(status)) {
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m_pattern_ = pattern;
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usearch_setPattern(m_strsrch_, m_pattern_.getBuffer(), m_pattern_.length(),
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&status);
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}
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}
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const UnicodeString & StringSearch::getPattern() const
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{
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return m_pattern_;
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}
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// public methods ----------------------------------------------------
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void StringSearch::reset()
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{
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usearch_reset(m_strsrch_);
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}
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SearchIterator * StringSearch::safeClone(void) const
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{
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UErrorCode status = U_ZERO_ERROR;
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StringSearch *result = new StringSearch(m_pattern_, m_text_,
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(RuleBasedCollator *)&m_collator_,
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m_breakiterator_,
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status);
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/* test for NULL */
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if (result == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return 0;
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}
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result->setOffset(getOffset(), status);
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result->setMatchStart(m_strsrch_->search->matchedIndex);
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result->setMatchLength(m_strsrch_->search->matchedLength);
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if (U_FAILURE(status)) {
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return NULL;
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}
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return result;
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}
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// protected method -------------------------------------------------
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int32_t StringSearch::handleNext(int32_t position, UErrorCode &status)
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{
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// values passed here are already in the pre-shift position
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if (U_SUCCESS(status)) {
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if (m_strsrch_->pattern.CELength == 0) {
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m_search_->matchedIndex =
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m_search_->matchedIndex == USEARCH_DONE ?
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getOffset() : m_search_->matchedIndex + 1;
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m_search_->matchedLength = 0;
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ucol_setOffset(m_strsrch_->textIter, m_search_->matchedIndex,
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&status);
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if (m_search_->matchedIndex == m_search_->textLength) {
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m_search_->matchedIndex = USEARCH_DONE;
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}
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}
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else {
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// looking at usearch.cpp, this part is shifted out to
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// StringSearch instead of SearchIterator because m_strsrch_ is
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// not accessible in SearchIterator
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#if 0
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if (position + m_strsrch_->pattern.defaultShiftSize
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> m_search_->textLength) {
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setMatchNotFound();
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return USEARCH_DONE;
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}
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#endif
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if (m_search_->matchedLength <= 0) {
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// the flipping direction issue has already been handled
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// in next()
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// for boundary check purposes. this will ensure that the
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// next match will not preceed the current offset
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// note search->matchedIndex will always be set to something
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// in the code
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m_search_->matchedIndex = position - 1;
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}
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ucol_setOffset(m_strsrch_->textIter, position, &status);
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#if 0
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for (;;) {
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if (m_search_->isCanonicalMatch) {
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// can't use exact here since extra accents are allowed.
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usearch_handleNextCanonical(m_strsrch_, &status);
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}
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else {
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usearch_handleNextExact(m_strsrch_, &status);
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}
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if (U_FAILURE(status)) {
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return USEARCH_DONE;
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}
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if (m_breakiterator_ == NULL
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#if !UCONFIG_NO_BREAK_ITERATION
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||
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m_search_->matchedIndex == USEARCH_DONE ||
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(m_breakiterator_->isBoundary(m_search_->matchedIndex) &&
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m_breakiterator_->isBoundary(m_search_->matchedIndex +
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m_search_->matchedLength))
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#endif
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) {
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if (m_search_->matchedIndex == USEARCH_DONE) {
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ucol_setOffset(m_strsrch_->textIter,
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m_search_->textLength, &status);
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}
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else {
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ucol_setOffset(m_strsrch_->textIter,
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m_search_->matchedIndex, &status);
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}
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return m_search_->matchedIndex;
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}
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}
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#else
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// if m_strsrch_->breakIter is always the same as m_breakiterator_
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// then we don't need to check the match boundaries here because
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// usearch_handleNextXXX will already have done it.
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if (m_search_->isCanonicalMatch) {
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// *could* actually use exact here 'cause no extra accents allowed...
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usearch_handleNextCanonical(m_strsrch_, &status);
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} else {
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usearch_handleNextExact(m_strsrch_, &status);
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}
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if (U_FAILURE(status)) {
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return USEARCH_DONE;
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}
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if (m_search_->matchedIndex == USEARCH_DONE) {
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ucol_setOffset(m_strsrch_->textIter, m_search_->textLength, &status);
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} else {
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ucol_setOffset(m_strsrch_->textIter, m_search_->matchedIndex, &status);
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}
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return m_search_->matchedIndex;
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#endif
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}
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}
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return USEARCH_DONE;
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}
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int32_t StringSearch::handlePrev(int32_t position, UErrorCode &status)
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{
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// values passed here are already in the pre-shift position
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if (U_SUCCESS(status)) {
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if (m_strsrch_->pattern.CELength == 0) {
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m_search_->matchedIndex =
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(m_search_->matchedIndex == USEARCH_DONE ? getOffset() :
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m_search_->matchedIndex);
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if (m_search_->matchedIndex == 0) {
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setMatchNotFound();
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}
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else {
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m_search_->matchedIndex --;
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ucol_setOffset(m_strsrch_->textIter, m_search_->matchedIndex,
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&status);
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m_search_->matchedLength = 0;
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}
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}
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else {
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// looking at usearch.cpp, this part is shifted out to
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// StringSearch instead of SearchIterator because m_strsrch_ is
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// not accessible in SearchIterator
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#if 0
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if (!m_search_->isOverlap &&
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position - m_strsrch_->pattern.defaultShiftSize < 0) {
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setMatchNotFound();
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return USEARCH_DONE;
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}
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for (;;) {
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if (m_search_->isCanonicalMatch) {
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// can't use exact here since extra accents are allowed.
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usearch_handlePreviousCanonical(m_strsrch_, &status);
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}
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else {
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usearch_handlePreviousExact(m_strsrch_, &status);
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}
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if (U_FAILURE(status)) {
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return USEARCH_DONE;
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}
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if (m_breakiterator_ == NULL
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#if !UCONFIG_NO_BREAK_ITERATION
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||
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m_search_->matchedIndex == USEARCH_DONE ||
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(m_breakiterator_->isBoundary(m_search_->matchedIndex) &&
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m_breakiterator_->isBoundary(m_search_->matchedIndex +
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m_search_->matchedLength))
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#endif
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) {
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return m_search_->matchedIndex;
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}
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}
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#else
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ucol_setOffset(m_strsrch_->textIter, position, &status);
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if (m_search_->isCanonicalMatch) {
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// *could* use exact match here since extra accents *not* allowed!
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usearch_handlePreviousCanonical(m_strsrch_, &status);
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} else {
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usearch_handlePreviousExact(m_strsrch_, &status);
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}
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if (U_FAILURE(status)) {
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return USEARCH_DONE;
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}
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return m_search_->matchedIndex;
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#endif
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}
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return m_search_->matchedIndex;
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}
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return USEARCH_DONE;
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_COLLATION */
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