685 lines
24 KiB
C++
685 lines
24 KiB
C++
//
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// rbbisetb.cpp
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//
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/*
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***************************************************************************
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* Copyright (C) 2002-2005 International Business Machines Corporation *
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* and others. All rights reserved. *
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***************************************************************************
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*/
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//
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// RBBISetBuilder Handles processing of Unicode Sets from RBBI rules
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// (part of the rule building process.)
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//
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// Starting with the rules parse tree from the scanner,
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//
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// - Enumerate the set of UnicodeSets that are referenced
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// by the RBBI rules.
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// - compute a set of non-overlapping character ranges
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// with all characters within a range belonging to the same
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// set of input uniocde sets.
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// - Derive a set of non-overlapping UnicodeSet (like things)
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// that will correspond to columns in the state table for
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// the RBBI execution engine. All characters within one
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// of these sets belong to the same set of the original
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// UnicodeSets from the user's rules.
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// - construct the trie table that maps input characters
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// to the index of the matching non-overlapping set of set from
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// the previous step.
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//
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_BREAK_ITERATION
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#include "unicode/uniset.h"
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#include "utrie.h"
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#include "uvector.h"
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#include "uassert.h"
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#include "cmemory.h"
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#include "cstring.h"
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#include "rbbisetb.h"
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#include "rbbinode.h"
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//------------------------------------------------------------------------
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//
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// getFoldedRBBIValue Call-back function used during building of Trie table.
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// Folding value: just store the offset (16 bits)
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// if there is any non-0 entry.
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// (It'd really be nice if the Trie builder would provide a
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// simple default, so this function could go away from here.)
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//
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//------------------------------------------------------------------------
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/* folding value: just store the offset (16 bits) if there is any non-0 entry */
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U_CDECL_BEGIN
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static uint32_t U_CALLCONV
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getFoldedRBBIValue(UNewTrie *trie, UChar32 start, int32_t offset) {
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uint32_t value;
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UChar32 limit;
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UBool inBlockZero;
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limit=start+0x400;
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while(start<limit) {
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value=utrie_get32(trie, start, &inBlockZero);
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if(inBlockZero) {
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start+=UTRIE_DATA_BLOCK_LENGTH;
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} else if(value!=0) {
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return (uint32_t)(offset|0x8000);
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} else {
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++start;
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}
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}
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return 0;
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}
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U_CDECL_END
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U_NAMESPACE_BEGIN
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//------------------------------------------------------------------------
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//
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// Constructor
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//
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//------------------------------------------------------------------------
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RBBISetBuilder::RBBISetBuilder(RBBIRuleBuilder *rb)
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{
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fRB = rb;
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fStatus = rb->fStatus;
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fRangeList = 0;
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fTrie = 0;
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fTrieSize = 0;
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fGroupCount = 0;
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fSawBOF = FALSE;
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}
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//------------------------------------------------------------------------
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//
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// Destructor
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//
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//------------------------------------------------------------------------
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RBBISetBuilder::~RBBISetBuilder()
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{
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RangeDescriptor *nextRangeDesc;
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// Walk through & delete the linked list of RangeDescriptors
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for (nextRangeDesc = fRangeList; nextRangeDesc!=NULL;) {
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RangeDescriptor *r = nextRangeDesc;
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nextRangeDesc = r->fNext;
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delete r;
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}
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utrie_close(fTrie);
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}
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//------------------------------------------------------------------------
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//
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// build Build the list of non-overlapping character ranges
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// from the Unicode Sets.
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//
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//------------------------------------------------------------------------
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void RBBISetBuilder::build() {
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RBBINode *usetNode;
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RangeDescriptor *rlRange;
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if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "usets")) {printSets();}
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//
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// Initialize the process by creating a single range encompassing all characters
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// that is in no sets.
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//
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fRangeList = new RangeDescriptor(*fStatus); // will check for status here
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fRangeList->fStartChar = 0;
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fRangeList->fEndChar = 0x10ffff;
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if (U_FAILURE(*fStatus)) {
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return;
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}
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//
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// Find the set of non-overlapping ranges of characters
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//
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int ni;
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for (ni=0; ; ni++) { // Loop over each of the UnicodeSets encountered in the input rules
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usetNode = (RBBINode *)this->fRB->fUSetNodes->elementAt(ni);
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if (usetNode==NULL) {
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break;
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}
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UnicodeSet *inputSet = usetNode->fInputSet;
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int32_t inputSetRangeCount = inputSet->getRangeCount();
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int inputSetRangeIndex = 0;
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rlRange = fRangeList;
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for (;;) {
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if (inputSetRangeIndex >= inputSetRangeCount) {
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break;
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}
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UChar32 inputSetRangeBegin = inputSet->getRangeStart(inputSetRangeIndex);
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UChar32 inputSetRangeEnd = inputSet->getRangeEnd(inputSetRangeIndex);
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// skip over ranges from the range list that are completely
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// below the current range from the input unicode set.
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while (rlRange->fEndChar < inputSetRangeBegin) {
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rlRange = rlRange->fNext;
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}
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// If the start of the range from the range list is before with
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// the start of the range from the unicode set, split the range list range
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// in two, with one part being before (wholly outside of) the unicode set
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// and the other containing the rest.
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// Then continue the loop; the post-split current range will then be skipped
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// over
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if (rlRange->fStartChar < inputSetRangeBegin) {
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rlRange->split(inputSetRangeBegin, *fStatus);
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if (U_FAILURE(*fStatus)) {
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return;
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}
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continue;
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}
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// Same thing at the end of the ranges...
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// If the end of the range from the range list doesn't coincide with
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// the end of the range from the unicode set, split the range list
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// range in two. The first part of the split range will be
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// wholly inside the Unicode set.
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if (rlRange->fEndChar > inputSetRangeEnd) {
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rlRange->split(inputSetRangeEnd+1, *fStatus);
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if (U_FAILURE(*fStatus)) {
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return;
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}
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}
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// The current rlRange is now entirely within the UnicodeSet range.
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// Add this unicode set to the list of sets for this rlRange
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if (rlRange->fIncludesSets->indexOf(usetNode) == -1) {
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rlRange->fIncludesSets->addElement(usetNode, *fStatus);
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if (U_FAILURE(*fStatus)) {
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return;
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}
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}
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// Advance over ranges that we are finished with.
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if (inputSetRangeEnd == rlRange->fEndChar) {
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inputSetRangeIndex++;
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}
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rlRange = rlRange->fNext;
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}
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}
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if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "range")) { printRanges();}
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//
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// Group the above ranges, with each group consisting of one or more
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// ranges that are in exactly the same set of original UnicodeSets.
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// The groups are numbered, and these group numbers are the set of
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// input symbols recognized by the run-time state machine.
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//
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// Numbering: # 0 (state table column 0) is unused.
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// # 1 is reserved - table column 1 is for end-of-input
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// # 2 is reserved - table column 2 is for beginning-in-input
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// # 3 is the first range list.
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//
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RangeDescriptor *rlSearchRange;
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for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) {
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for (rlSearchRange=fRangeList; rlSearchRange != rlRange; rlSearchRange=rlSearchRange->fNext) {
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if (rlRange->fIncludesSets->equals(*rlSearchRange->fIncludesSets)) {
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rlRange->fNum = rlSearchRange->fNum;
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break;
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}
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}
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if (rlRange->fNum == 0) {
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fGroupCount ++;
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rlRange->fNum = fGroupCount+2;
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rlRange->setDictionaryFlag();
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addValToSets(rlRange->fIncludesSets, fGroupCount+2);
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}
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}
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// Handle input sets that contain the special string {eof}.
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// Column 1 of the state table is reserved for EOF on input.
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// Column 2 is reserved for before-the-start-input.
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// (This column can be optimized away later if there are no rule
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// references to {bof}.)
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// Add this column value (1 or 2) to the equivalent expression
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// subtree for each UnicodeSet that contains the string {eof}
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// Because {bof} and {eof} are not a characters in the normal sense,
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// they doesn't affect the computation of ranges or TRIE.
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static const UChar eofUString[] = {0x65, 0x6f, 0x66, 0};
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static const UChar bofUString[] = {0x62, 0x6f, 0x66, 0};
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UnicodeString eofString(eofUString);
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UnicodeString bofString(bofUString);
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for (ni=0; ; ni++) { // Loop over each of the UnicodeSets encountered in the input rules
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usetNode = (RBBINode *)this->fRB->fUSetNodes->elementAt(ni);
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if (usetNode==NULL) {
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break;
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}
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UnicodeSet *inputSet = usetNode->fInputSet;
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if (inputSet->contains(eofString)) {
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addValToSet(usetNode, 1);
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}
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if (inputSet->contains(bofString)) {
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addValToSet(usetNode, 2);
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fSawBOF = TRUE;
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}
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}
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if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "rgroup")) {printRangeGroups();}
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if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "esets")) {printSets();}
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//
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// Build the Trie table for mapping UChar32 values to the corresponding
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// range group number
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//
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fTrie = utrie_open(NULL, // Pre-existing trie to be filled in
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NULL, // Data array (utrie will allocate one)
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100000, // Max Data Length
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0, // Initial value for all code points
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0, // Lead surrogate unit value
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TRUE); // Keep Latin 1 in separately
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for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) {
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utrie_setRange32(fTrie, rlRange->fStartChar, rlRange->fEndChar+1, rlRange->fNum, TRUE);
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}
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}
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//-----------------------------------------------------------------------------------
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//
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// getTrieSize() Return the size that will be required to serialize the Trie.
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//
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//-----------------------------------------------------------------------------------
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int32_t RBBISetBuilder::getTrieSize() /*const*/ {
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fTrieSize = utrie_serialize(fTrie,
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NULL, // Buffer
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0, // Capacity
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getFoldedRBBIValue,
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TRUE, // Reduce to 16 bits
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fStatus);
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// RBBIDebugPrintf("Trie table size is %d\n", trieSize);
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return fTrieSize;
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}
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//-----------------------------------------------------------------------------------
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//
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// serializeTrie() Put the serialized trie at the specified address.
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// Trust the caller to have given us enough memory.
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// getTrieSize() MUST be called first.
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//
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//-----------------------------------------------------------------------------------
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void RBBISetBuilder::serializeTrie(uint8_t *where) {
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utrie_serialize(fTrie,
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where, // Buffer
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fTrieSize, // Capacity
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getFoldedRBBIValue,
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TRUE, // Reduce to 16 bits
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fStatus);
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}
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//------------------------------------------------------------------------
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//
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// addValToSets Add a runtime-mapped input value to each uset from a
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// list of uset nodes. (val corresponds to a state table column.)
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// For each of the original Unicode sets - which correspond
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// directly to uset nodes - a logically equivalent expression
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// is constructed in terms of the remapped runtime input
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// symbol set. This function adds one runtime input symbol to
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// a list of sets.
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//
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// The "logically equivalent expression" is the tree for an
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// or-ing together of all of the symbols that go into the set.
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//
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//------------------------------------------------------------------------
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void RBBISetBuilder::addValToSets(UVector *sets, uint32_t val) {
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int32_t ix;
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for (ix=0; ix<sets->size(); ix++) {
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RBBINode *usetNode = (RBBINode *)sets->elementAt(ix);
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addValToSet(usetNode, val);
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}
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}
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void RBBISetBuilder::addValToSet(RBBINode *usetNode, uint32_t val) {
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RBBINode *leafNode = new RBBINode(RBBINode::leafChar);
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leafNode->fVal = (unsigned short)val;
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if (usetNode->fLeftChild == NULL) {
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usetNode->fLeftChild = leafNode;
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leafNode->fParent = usetNode;
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} else {
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// There are already input symbols present for this set.
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// Set up an OR node, with the previous stuff as the left child
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// and the new value as the right child.
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RBBINode *orNode = new RBBINode(RBBINode::opOr);
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orNode->fLeftChild = usetNode->fLeftChild;
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orNode->fRightChild = leafNode;
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orNode->fLeftChild->fParent = orNode;
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orNode->fRightChild->fParent = orNode;
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usetNode->fLeftChild = orNode;
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orNode->fParent = usetNode;
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}
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}
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//------------------------------------------------------------------------
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//
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// getNumCharCategories
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//
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//------------------------------------------------------------------------
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int32_t RBBISetBuilder::getNumCharCategories() const {
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return fGroupCount + 3;
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}
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//------------------------------------------------------------------------
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//
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// sawBOF
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//
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//------------------------------------------------------------------------
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UBool RBBISetBuilder::sawBOF() const {
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return fSawBOF;
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}
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//------------------------------------------------------------------------
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//
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// getFirstChar Given a runtime RBBI character category, find
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// the first UChar32 that is in the set of chars
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// in the category.
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//------------------------------------------------------------------------
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UChar32 RBBISetBuilder::getFirstChar(int32_t category) const {
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RangeDescriptor *rlRange;
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UChar32 retVal = (UChar32)-1;
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for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) {
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if (rlRange->fNum == category) {
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retVal = rlRange->fStartChar;
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break;
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}
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}
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return retVal;
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}
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//------------------------------------------------------------------------
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//
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// printRanges A debugging function.
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// dump out all of the range definitions.
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//
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//------------------------------------------------------------------------
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#ifdef RBBI_DEBUG
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void RBBISetBuilder::printRanges() {
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RangeDescriptor *rlRange;
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int i;
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RBBIDebugPrintf("\n\n Nonoverlapping Ranges ...\n");
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for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) {
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RBBIDebugPrintf("%2i %4x-%4x ", rlRange->fNum, rlRange->fStartChar, rlRange->fEndChar);
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for (i=0; i<rlRange->fIncludesSets->size(); i++) {
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RBBINode *usetNode = (RBBINode *)rlRange->fIncludesSets->elementAt(i);
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UnicodeString setName = UNICODE_STRING("anon", 4);
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RBBINode *setRef = usetNode->fParent;
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if (setRef != NULL) {
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RBBINode *varRef = setRef->fParent;
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if (varRef != NULL && varRef->fType == RBBINode::varRef) {
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setName = varRef->fText;
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}
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}
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RBBI_DEBUG_printUnicodeString(setName); RBBIDebugPrintf(" ");
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}
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RBBIDebugPrintf("\n");
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}
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}
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#endif
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//------------------------------------------------------------------------
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//
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// printRangeGroups A debugging function.
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// dump out all of the range groups.
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//
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//------------------------------------------------------------------------
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#ifdef RBBI_DEBUG
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void RBBISetBuilder::printRangeGroups() {
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RangeDescriptor *rlRange;
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RangeDescriptor *tRange;
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int i;
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int lastPrintedGroupNum = 0;
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RBBIDebugPrintf("\nRanges grouped by Unicode Set Membership...\n");
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for (rlRange = fRangeList; rlRange!=0; rlRange=rlRange->fNext) {
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int groupNum = rlRange->fNum & 0xbfff;
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if (groupNum > lastPrintedGroupNum) {
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lastPrintedGroupNum = groupNum;
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RBBIDebugPrintf("%2i ", groupNum);
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if (rlRange->fNum & 0x4000) { RBBIDebugPrintf(" <DICT> ");}
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for (i=0; i<rlRange->fIncludesSets->size(); i++) {
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RBBINode *usetNode = (RBBINode *)rlRange->fIncludesSets->elementAt(i);
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UnicodeString setName = UNICODE_STRING("anon", 4);
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RBBINode *setRef = usetNode->fParent;
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if (setRef != NULL) {
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RBBINode *varRef = setRef->fParent;
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if (varRef != NULL && varRef->fType == RBBINode::varRef) {
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setName = varRef->fText;
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}
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}
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RBBI_DEBUG_printUnicodeString(setName); RBBIDebugPrintf(" ");
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}
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i = 0;
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for (tRange = rlRange; tRange != 0; tRange = tRange->fNext) {
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if (tRange->fNum == rlRange->fNum) {
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if (i++ % 5 == 0) {
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RBBIDebugPrintf("\n ");
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}
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RBBIDebugPrintf(" %05x-%05x", tRange->fStartChar, tRange->fEndChar);
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}
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}
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RBBIDebugPrintf("\n");
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}
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}
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RBBIDebugPrintf("\n");
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}
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#endif
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//------------------------------------------------------------------------
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//
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// printSets A debugging function.
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// dump out all of the set definitions.
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//
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//------------------------------------------------------------------------
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#ifdef RBBI_DEBUG
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void RBBISetBuilder::printSets() {
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int i;
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RBBIDebugPrintf("\n\nUnicode Sets List\n------------------\n");
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for (i=0; ; i++) {
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RBBINode *usetNode;
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RBBINode *setRef;
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RBBINode *varRef;
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UnicodeString setName;
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usetNode = (RBBINode *)fRB->fUSetNodes->elementAt(i);
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if (usetNode == NULL) {
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break;
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}
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RBBIDebugPrintf("%3d ", i);
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|
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 (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
/* test for NULL */
|
|
if(nr == 0) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
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 */
|