| // |
| // rbbisetb.cpp |
| // |
| /* |
| *************************************************************************** |
| * Copyright (C) 2002-2008 International Business Machines Corporation * |
| * and others. All rights reserved. * |
| *************************************************************************** |
| */ |
| // |
| // RBBISetBuilder Handles processing of Unicode Sets from RBBI rules |
| // (part of the rule building process.) |
| // |
| // Starting with the rules parse tree from the scanner, |
| // |
| // - Enumerate the set of UnicodeSets that are referenced |
| // by the RBBI rules. |
| // - compute a set of non-overlapping character ranges |
| // with all characters within a range belonging to the same |
| // set of input uniocde sets. |
| // - Derive a set of non-overlapping UnicodeSet (like things) |
| // that will correspond to columns in the state table for |
| // the RBBI execution engine. All characters within one |
| // of these sets belong to the same set of the original |
| // UnicodeSets from the user's rules. |
| // - construct the trie table that maps input characters |
| // to the index of the matching non-overlapping set of set from |
| // the previous step. |
| // |
| |
| #include "unicode/utypes.h" |
| |
| #if !UCONFIG_NO_BREAK_ITERATION |
| |
| #include "unicode/uniset.h" |
| #include "utrie.h" |
| #include "uvector.h" |
| #include "uassert.h" |
| #include "cmemory.h" |
| #include "cstring.h" |
| |
| #include "rbbisetb.h" |
| #include "rbbinode.h" |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // getFoldedRBBIValue Call-back function used during building of Trie table. |
| // Folding value: just store the offset (16 bits) |
| // if there is any non-0 entry. |
| // (It'd really be nice if the Trie builder would provide a |
| // simple default, so this function could go away from here.) |
| // |
| //------------------------------------------------------------------------ |
| /* folding value: just store the offset (16 bits) if there is any non-0 entry */ |
| U_CDECL_BEGIN |
| static uint32_t U_CALLCONV |
| getFoldedRBBIValue(UNewTrie *trie, UChar32 start, int32_t offset) { |
| uint32_t value; |
| UChar32 limit; |
| UBool inBlockZero; |
| |
| limit=start+0x400; |
| while(start<limit) { |
| value=utrie_get32(trie, start, &inBlockZero); |
| if(inBlockZero) { |
| start+=UTRIE_DATA_BLOCK_LENGTH; |
| } else if(value!=0) { |
| return (uint32_t)(offset|0x8000); |
| } else { |
| ++start; |
| } |
| } |
| return 0; |
| } |
| |
| |
| U_CDECL_END |
| |
| |
| |
| U_NAMESPACE_BEGIN |
| |
| //------------------------------------------------------------------------ |
| // |
| // Constructor |
| // |
| //------------------------------------------------------------------------ |
| RBBISetBuilder::RBBISetBuilder(RBBIRuleBuilder *rb) |
| { |
| fRB = rb; |
| fStatus = rb->fStatus; |
| fRangeList = 0; |
| fTrie = 0; |
| fTrieSize = 0; |
| fGroupCount = 0; |
| fSawBOF = FALSE; |
| } |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // Destructor |
| // |
| //------------------------------------------------------------------------ |
| RBBISetBuilder::~RBBISetBuilder() |
| { |
| RangeDescriptor *nextRangeDesc; |
| |
| // Walk through & delete the linked list of RangeDescriptors |
| for (nextRangeDesc = fRangeList; nextRangeDesc!=NULL;) { |
| RangeDescriptor *r = nextRangeDesc; |
| nextRangeDesc = r->fNext; |
| delete r; |
| } |
| |
| utrie_close(fTrie); |
| } |
| |
| |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // build Build the list of non-overlapping character ranges |
| // from the Unicode Sets. |
| // |
| //------------------------------------------------------------------------ |
| void RBBISetBuilder::build() { |
| RBBINode *usetNode; |
| RangeDescriptor *rlRange; |
| |
| if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "usets")) {printSets();} |
| |
| // |
| // Initialize the process by creating a single range encompassing all characters |
| // that is in no sets. |
| // |
| fRangeList = new RangeDescriptor(*fStatus); // will check for status here |
| if (fRangeList == NULL) { |
| *fStatus = U_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| fRangeList->fStartChar = 0; |
| fRangeList->fEndChar = 0x10ffff; |
| |
| if (U_FAILURE(*fStatus)) { |
| return; |
| } |
| |
| // |
| // Find the set of non-overlapping ranges of characters |
| // |
| int ni; |
| for (ni=0; ; ni++) { // Loop over each of the UnicodeSets encountered in the input rules |
| usetNode = (RBBINode *)this->fRB->fUSetNodes->elementAt(ni); |
| if (usetNode==NULL) { |
| break; |
| } |
| |
| UnicodeSet *inputSet = usetNode->fInputSet; |
| int32_t inputSetRangeCount = inputSet->getRangeCount(); |
| int inputSetRangeIndex = 0; |
| rlRange = fRangeList; |
| |
| for (;;) { |
| if (inputSetRangeIndex >= inputSetRangeCount) { |
| break; |
| } |
| UChar32 inputSetRangeBegin = inputSet->getRangeStart(inputSetRangeIndex); |
| UChar32 inputSetRangeEnd = inputSet->getRangeEnd(inputSetRangeIndex); |
| |
| // skip over ranges from the range list that are completely |
| // below the current range from the input unicode set. |
| while (rlRange->fEndChar < inputSetRangeBegin) { |
| rlRange = rlRange->fNext; |
| } |
| |
| // If the start of the range from the range list is before with |
| // the start of the range from the unicode set, split the range list range |
| // in two, with one part being before (wholly outside of) the unicode set |
| // and the other containing the rest. |
| // Then continue the loop; the post-split current range will then be skipped |
| // over |
| if (rlRange->fStartChar < inputSetRangeBegin) { |
| rlRange->split(inputSetRangeBegin, *fStatus); |
| if (U_FAILURE(*fStatus)) { |
| return; |
| } |
| continue; |
| } |
| |
| // Same thing at the end of the ranges... |
| // If the end of the range from the range list doesn't coincide with |
| // the end of the range from the unicode set, split the range list |
| // range in two. The first part of the split range will be |
| // wholly inside the Unicode set. |
| if (rlRange->fEndChar > inputSetRangeEnd) { |
| rlRange->split(inputSetRangeEnd+1, *fStatus); |
| if (U_FAILURE(*fStatus)) { |
| return; |
| } |
| } |
| |
| // The current rlRange is now entirely within the UnicodeSet range. |
| // Add this unicode set to the list of sets for this rlRange |
| if (rlRange->fIncludesSets->indexOf(usetNode) == -1) { |
| rlRange->fIncludesSets->addElement(usetNode, *fStatus); |
| if (U_FAILURE(*fStatus)) { |
| return; |
| } |
| } |
| |
| // Advance over ranges that we are finished with. |
| if (inputSetRangeEnd == rlRange->fEndChar) { |
| inputSetRangeIndex++; |
| } |
| rlRange = rlRange->fNext; |
| } |
| } |
| |
| if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "range")) { printRanges();} |
| |
| // |
| // Group the above ranges, with each group consisting of one or more |
| // ranges that are in exactly the same set of original UnicodeSets. |
| // The groups are numbered, and these group numbers are the set of |
| // input symbols recognized by the run-time state machine. |
| // |
| // Numbering: # 0 (state table column 0) is unused. |
| // # 1 is reserved - table column 1 is for end-of-input |
| // # 2 is reserved - table column 2 is for beginning-in-input |
| // # 3 is the first range list. |
| // |
| RangeDescriptor *rlSearchRange; |
| for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) { |
| for (rlSearchRange=fRangeList; rlSearchRange != rlRange; rlSearchRange=rlSearchRange->fNext) { |
| if (rlRange->fIncludesSets->equals(*rlSearchRange->fIncludesSets)) { |
| rlRange->fNum = rlSearchRange->fNum; |
| break; |
| } |
| } |
| if (rlRange->fNum == 0) { |
| fGroupCount ++; |
| rlRange->fNum = fGroupCount+2; |
| rlRange->setDictionaryFlag(); |
| addValToSets(rlRange->fIncludesSets, fGroupCount+2); |
| } |
| } |
| |
| // Handle input sets that contain the special string {eof}. |
| // Column 1 of the state table is reserved for EOF on input. |
| // Column 2 is reserved for before-the-start-input. |
| // (This column can be optimized away later if there are no rule |
| // references to {bof}.) |
| // Add this column value (1 or 2) to the equivalent expression |
| // subtree for each UnicodeSet that contains the string {eof} |
| // Because {bof} and {eof} are not a characters in the normal sense, |
| // they doesn't affect the computation of ranges or TRIE. |
| static const UChar eofUString[] = {0x65, 0x6f, 0x66, 0}; |
| static const UChar bofUString[] = {0x62, 0x6f, 0x66, 0}; |
| |
| UnicodeString eofString(eofUString); |
| UnicodeString bofString(bofUString); |
| for (ni=0; ; ni++) { // Loop over each of the UnicodeSets encountered in the input rules |
| usetNode = (RBBINode *)this->fRB->fUSetNodes->elementAt(ni); |
| if (usetNode==NULL) { |
| break; |
| } |
| UnicodeSet *inputSet = usetNode->fInputSet; |
| if (inputSet->contains(eofString)) { |
| addValToSet(usetNode, 1); |
| } |
| if (inputSet->contains(bofString)) { |
| addValToSet(usetNode, 2); |
| fSawBOF = TRUE; |
| } |
| } |
| |
| |
| if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "rgroup")) {printRangeGroups();} |
| if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "esets")) {printSets();} |
| |
| // |
| // Build the Trie table for mapping UChar32 values to the corresponding |
| // range group number |
| // |
| fTrie = utrie_open(NULL, // Pre-existing trie to be filled in |
| NULL, // Data array (utrie will allocate one) |
| 100000, // Max Data Length |
| 0, // Initial value for all code points |
| 0, // Lead surrogate unit value |
| TRUE); // Keep Latin 1 in separately |
| |
| |
| for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) { |
| utrie_setRange32(fTrie, rlRange->fStartChar, rlRange->fEndChar+1, rlRange->fNum, TRUE); |
| } |
| } |
| |
| |
| |
| //----------------------------------------------------------------------------------- |
| // |
| // getTrieSize() Return the size that will be required to serialize the Trie. |
| // |
| //----------------------------------------------------------------------------------- |
| int32_t RBBISetBuilder::getTrieSize() /*const*/ { |
| fTrieSize = utrie_serialize(fTrie, |
| NULL, // Buffer |
| 0, // Capacity |
| getFoldedRBBIValue, |
| TRUE, // Reduce to 16 bits |
| fStatus); |
| // RBBIDebugPrintf("Trie table size is %d\n", trieSize); |
| return fTrieSize; |
| } |
| |
| |
| //----------------------------------------------------------------------------------- |
| // |
| // serializeTrie() Put the serialized trie at the specified address. |
| // Trust the caller to have given us enough memory. |
| // getTrieSize() MUST be called first. |
| // |
| //----------------------------------------------------------------------------------- |
| void RBBISetBuilder::serializeTrie(uint8_t *where) { |
| utrie_serialize(fTrie, |
| where, // Buffer |
| fTrieSize, // Capacity |
| getFoldedRBBIValue, |
| TRUE, // Reduce to 16 bits |
| fStatus); |
| } |
| |
| //------------------------------------------------------------------------ |
| // |
| // addValToSets Add a runtime-mapped input value to each uset from a |
| // list of uset nodes. (val corresponds to a state table column.) |
| // For each of the original Unicode sets - which correspond |
| // directly to uset nodes - a logically equivalent expression |
| // is constructed in terms of the remapped runtime input |
| // symbol set. This function adds one runtime input symbol to |
| // a list of sets. |
| // |
| // The "logically equivalent expression" is the tree for an |
| // or-ing together of all of the symbols that go into the set. |
| // |
| //------------------------------------------------------------------------ |
| void RBBISetBuilder::addValToSets(UVector *sets, uint32_t val) { |
| int32_t ix; |
| |
| for (ix=0; ix<sets->size(); ix++) { |
| RBBINode *usetNode = (RBBINode *)sets->elementAt(ix); |
| addValToSet(usetNode, val); |
| } |
| } |
| |
| void RBBISetBuilder::addValToSet(RBBINode *usetNode, uint32_t val) { |
| RBBINode *leafNode = new RBBINode(RBBINode::leafChar); |
| if (leafNode == NULL) { |
| *fStatus = U_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| leafNode->fVal = (unsigned short)val; |
| if (usetNode->fLeftChild == NULL) { |
| usetNode->fLeftChild = leafNode; |
| leafNode->fParent = usetNode; |
| } else { |
| // There are already input symbols present for this set. |
| // Set up an OR node, with the previous stuff as the left child |
| // and the new value as the right child. |
| RBBINode *orNode = new RBBINode(RBBINode::opOr); |
| if (orNode == NULL) { |
| *fStatus = U_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| orNode->fLeftChild = usetNode->fLeftChild; |
| orNode->fRightChild = leafNode; |
| orNode->fLeftChild->fParent = orNode; |
| orNode->fRightChild->fParent = orNode; |
| usetNode->fLeftChild = orNode; |
| orNode->fParent = usetNode; |
| } |
| } |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // getNumCharCategories |
| // |
| //------------------------------------------------------------------------ |
| int32_t RBBISetBuilder::getNumCharCategories() const { |
| return fGroupCount + 3; |
| } |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // sawBOF |
| // |
| //------------------------------------------------------------------------ |
| UBool RBBISetBuilder::sawBOF() const { |
| return fSawBOF; |
| } |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // getFirstChar Given a runtime RBBI character category, find |
| // the first UChar32 that is in the set of chars |
| // in the category. |
| //------------------------------------------------------------------------ |
| UChar32 RBBISetBuilder::getFirstChar(int32_t category) const { |
| RangeDescriptor *rlRange; |
| UChar32 retVal = (UChar32)-1; |
| for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) { |
| if (rlRange->fNum == category) { |
| retVal = rlRange->fStartChar; |
| break; |
| } |
| } |
| return retVal; |
| } |
| |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // printRanges A debugging function. |
| // dump out all of the range definitions. |
| // |
| //------------------------------------------------------------------------ |
| #ifdef RBBI_DEBUG |
| void RBBISetBuilder::printRanges() { |
| RangeDescriptor *rlRange; |
| int i; |
| |
| RBBIDebugPrintf("\n\n Nonoverlapping Ranges ...\n"); |
| for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) { |
| RBBIDebugPrintf("%2i %4x-%4x ", rlRange->fNum, rlRange->fStartChar, rlRange->fEndChar); |
| |
| for (i=0; i<rlRange->fIncludesSets->size(); i++) { |
| RBBINode *usetNode = (RBBINode *)rlRange->fIncludesSets->elementAt(i); |
| UnicodeString setName = UNICODE_STRING("anon", 4); |
| RBBINode *setRef = usetNode->fParent; |
| if (setRef != NULL) { |
| RBBINode *varRef = setRef->fParent; |
| if (varRef != NULL && varRef->fType == RBBINode::varRef) { |
| setName = varRef->fText; |
| } |
| } |
| RBBI_DEBUG_printUnicodeString(setName); RBBIDebugPrintf(" "); |
| } |
| RBBIDebugPrintf("\n"); |
| } |
| } |
| #endif |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // printRangeGroups A debugging function. |
| // dump out all of the range groups. |
| // |
| //------------------------------------------------------------------------ |
| #ifdef RBBI_DEBUG |
| void RBBISetBuilder::printRangeGroups() { |
| RangeDescriptor *rlRange; |
| RangeDescriptor *tRange; |
| int i; |
| int lastPrintedGroupNum = 0; |
| |
| RBBIDebugPrintf("\nRanges grouped by Unicode Set Membership...\n"); |
| for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) { |
| int groupNum = rlRange->fNum & 0xbfff; |
| if (groupNum > lastPrintedGroupNum) { |
| lastPrintedGroupNum = groupNum; |
| RBBIDebugPrintf("%2i ", groupNum); |
| |
| if (rlRange->fNum & 0x4000) { RBBIDebugPrintf(" <DICT> ");} |
| |
| for (i=0; i<rlRange->fIncludesSets->size(); i++) { |
| RBBINode *usetNode = (RBBINode *)rlRange->fIncludesSets->elementAt(i); |
| UnicodeString setName = UNICODE_STRING("anon", 4); |
| RBBINode *setRef = usetNode->fParent; |
| if (setRef != NULL) { |
| RBBINode *varRef = setRef->fParent; |
| if (varRef != NULL && varRef->fType == RBBINode::varRef) { |
| setName = varRef->fText; |
| } |
| } |
| RBBI_DEBUG_printUnicodeString(setName); RBBIDebugPrintf(" "); |
| } |
| |
| i = 0; |
| for (tRange = rlRange; tRange != 0; tRange = tRange->fNext) { |
| if (tRange->fNum == rlRange->fNum) { |
| if (i++ % 5 == 0) { |
| RBBIDebugPrintf("\n "); |
| } |
| RBBIDebugPrintf(" %05x-%05x", tRange->fStartChar, tRange->fEndChar); |
| } |
| } |
| RBBIDebugPrintf("\n"); |
| } |
| } |
| RBBIDebugPrintf("\n"); |
| } |
| #endif |
| |
| |
| //------------------------------------------------------------------------ |
| // |
| // printSets A debugging function. |
| // dump out all of the set definitions. |
| // |
| //------------------------------------------------------------------------ |
| #ifdef RBBI_DEBUG |
| void RBBISetBuilder::printSets() { |
| int i; |
| |
| RBBIDebugPrintf("\n\nUnicode Sets List\n------------------\n"); |
| for (i=0; ; i++) { |
| RBBINode *usetNode; |
| RBBINode *setRef; |
| RBBINode *varRef; |
| UnicodeString setName; |
| |
| usetNode = (RBBINode *)fRB->fUSetNodes->elementAt(i); |
| if (usetNode == NULL) { |
| break; |
| } |
| |
| RBBIDebugPrintf("%3d ", i); |
| setName = UNICODE_STRING("anonymous", 9); |
| setRef = usetNode->fParent; |
| if (setRef != NULL) { |
| varRef = setRef->fParent; |
| if (varRef != NULL && varRef->fType == RBBINode::varRef) { |
| setName = varRef->fText; |
| } |
| } |
| RBBI_DEBUG_printUnicodeString(setName); |
| RBBIDebugPrintf(" "); |
| RBBI_DEBUG_printUnicodeString(usetNode->fText); |
| RBBIDebugPrintf("\n"); |
| if (usetNode->fLeftChild != NULL) { |
| usetNode->fLeftChild->printTree(TRUE); |
| } |
| } |
| RBBIDebugPrintf("\n"); |
| } |
| #endif |
| |
| |
| |
| //------------------------------------------------------------------------------------- |
| // |
| // RangeDescriptor copy constructor |
| // |
| //------------------------------------------------------------------------------------- |
| |
| RangeDescriptor::RangeDescriptor(const RangeDescriptor &other, UErrorCode &status) { |
| int i; |
| |
| this->fStartChar = other.fStartChar; |
| this->fEndChar = other.fEndChar; |
| this->fNum = other.fNum; |
| this->fNext = NULL; |
| UErrorCode oldstatus = status; |
| this->fIncludesSets = new UVector(status); |
| if (U_FAILURE(oldstatus)) { |
| status = oldstatus; |
| } |
| if (U_FAILURE(status)) { |
| return; |
| } |
| /* test for NULL */ |
| if (this->fIncludesSets == 0) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| |
| for (i=0; i<other.fIncludesSets->size(); i++) { |
| this->fIncludesSets->addElement(other.fIncludesSets->elementAt(i), status); |
| } |
| } |
| |
| |
| //------------------------------------------------------------------------------------- |
| // |
| // RangeDesriptor default constructor |
| // |
| //------------------------------------------------------------------------------------- |
| RangeDescriptor::RangeDescriptor(UErrorCode &status) { |
| this->fStartChar = 0; |
| this->fEndChar = 0; |
| this->fNum = 0; |
| this->fNext = NULL; |
| UErrorCode oldstatus = status; |
| this->fIncludesSets = new UVector(status); |
| if (U_FAILURE(oldstatus)) { |
| status = oldstatus; |
| } |
| if (U_FAILURE(status)) { |
| return; |
| } |
| /* test for NULL */ |
| if(this->fIncludesSets == 0) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| |
| } |
| |
| |
| //------------------------------------------------------------------------------------- |
| // |
| // RangeDesriptor Destructor |
| // |
| //------------------------------------------------------------------------------------- |
| RangeDescriptor::~RangeDescriptor() { |
| delete fIncludesSets; |
| fIncludesSets = NULL; |
| } |
| |
| //------------------------------------------------------------------------------------- |
| // |
| // RangeDesriptor::split() |
| // |
| //------------------------------------------------------------------------------------- |
| void RangeDescriptor::split(UChar32 where, UErrorCode &status) { |
| U_ASSERT(where>fStartChar && where<=fEndChar); |
| RangeDescriptor *nr = new RangeDescriptor(*this, status); |
| if(nr == 0) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| return; |
| } |
| if (U_FAILURE(status)) { |
| delete nr; |
| return; |
| } |
| // RangeDescriptor copy constructor copies all fields. |
| // Only need to update those that are different after the split. |
| nr->fStartChar = where; |
| this->fEndChar = where-1; |
| nr->fNext = this->fNext; |
| this->fNext = nr; |
| } |
| |
| |
| //------------------------------------------------------------------------------------- |
| // |
| // RangeDescriptor::setDictionaryFlag |
| // |
| // Character Category Numbers that include characters from |
| // the original Unicode Set named "dictionary" have bit 14 |
| // set to 1. The RBBI runtime engine uses this to trigger |
| // use of the word dictionary. |
| // |
| // This function looks through the Unicode Sets that it |
| // (the range) includes, and sets the bit in fNum when |
| // "dictionary" is among them. |
| // |
| // TODO: a faster way would be to find the set node for |
| // "dictionary" just once, rather than looking it |
| // up by name every time. |
| // |
| //------------------------------------------------------------------------------------- |
| void RangeDescriptor::setDictionaryFlag() { |
| int i; |
| |
| for (i=0; i<this->fIncludesSets->size(); i++) { |
| RBBINode *usetNode = (RBBINode *)fIncludesSets->elementAt(i); |
| UnicodeString setName; |
| RBBINode *setRef = usetNode->fParent; |
| if (setRef != NULL) { |
| RBBINode *varRef = setRef->fParent; |
| if (varRef != NULL && varRef->fType == RBBINode::varRef) { |
| setName = varRef->fText; |
| } |
| } |
| if (setName.compare(UNICODE_STRING("dictionary", 10)) == 0) { // TODO: no string literals. |
| this->fNum |= 0x4000; |
| break; |
| } |
| } |
| } |
| |
| |
| |
| U_NAMESPACE_END |
| |
| #endif /* #if !UCONFIG_NO_BREAK_ITERATION */ |
