/*
**********************************************************************
* Copyright (c) 2002-2009, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*/
//
// rbbitblb.cpp
//
#include "unicode/utypes.h"
#if !UCONFIG_NO_BREAK_ITERATION
#include "unicode/unistr.h"
#include "rbbitblb.h"
#include "rbbirb.h"
#include "rbbisetb.h"
#include "rbbidata.h"
#include "cstring.h"
#include "uassert.h"
#include "cmemory.h"
U_NAMESPACE_BEGIN
RBBITableBuilder::RBBITableBuilder(RBBIRuleBuilder *rb, RBBINode **rootNode) :
fTree(*rootNode) {
fRB = rb;
fStatus = fRB->fStatus;
UErrorCode status = U_ZERO_ERROR;
fDStates = new UVector(status);
if (U_FAILURE(*fStatus)) {
return;
}
if (U_FAILURE(status)) {
*fStatus = status;
return;
}
if (fDStates == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;;
}
}
RBBITableBuilder::~RBBITableBuilder() {
int i;
for (i=0; i<fDStates->size(); i++) {
delete (RBBIStateDescriptor *)fDStates->elementAt(i);
}
delete fDStates;
}
//-----------------------------------------------------------------------------
//
// RBBITableBuilder::build - This is the main function for building the DFA state transtion
// table from the RBBI rules parse tree.
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::build() {
if (U_FAILURE(*fStatus)) {
return;
}
// If there were no rules, just return. This situation can easily arise
// for the reverse rules.
if (fTree==NULL) {
return;
}
//
// Walk through the tree, replacing any references to $variables with a copy of the
// parse tree for the substition expression.
//
fTree = fTree->flattenVariables();
#ifdef RBBI_DEBUG
if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "ftree")) {
RBBIDebugPuts("Parse tree after flattening variable references.");
fTree->printTree(TRUE);
}
#endif
//
// If the rules contained any references to {bof}
// add a {bof} <cat> <former root of tree> to the
// tree. Means that all matches must start out with the
// {bof} fake character.
//
if (fRB->fSetBuilder->sawBOF()) {
RBBINode *bofTop = new RBBINode(RBBINode::opCat);
RBBINode *bofLeaf = new RBBINode(RBBINode::leafChar);
// Delete and exit if memory allocation failed.
if (bofTop == NULL || bofLeaf == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
delete bofTop;
delete bofLeaf;
return;
}
bofTop->fLeftChild = bofLeaf;
bofTop->fRightChild = fTree;
bofLeaf->fParent = bofTop;
bofLeaf->fVal = 2; // Reserved value for {bof}.
fTree = bofTop;
}
//
// Add a unique right-end marker to the expression.
// Appears as a cat-node, left child being the original tree,
// right child being the end marker.
//
RBBINode *cn = new RBBINode(RBBINode::opCat);
// Exit if memory allocation failed.
if (cn == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
return;
}
cn->fLeftChild = fTree;
fTree->fParent = cn;
cn->fRightChild = new RBBINode(RBBINode::endMark);
// Delete and exit if memory allocation failed.
if (cn->fRightChild == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
delete cn;
return;
}
cn->fRightChild->fParent = cn;
fTree = cn;
//
// Replace all references to UnicodeSets with the tree for the equivalent
// expression.
//
fTree->flattenSets();
#ifdef RBBI_DEBUG
if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "stree")) {
RBBIDebugPuts("Parse tree after flattening Unicode Set references.");
fTree->printTree(TRUE);
}
#endif
//
// calculate the functions nullable, firstpos, lastpos and followpos on
// nodes in the parse tree.
// See the alogrithm description in Aho.
// Understanding how this works by looking at the code alone will be
// nearly impossible.
//
calcNullable(fTree);
calcFirstPos(fTree);
calcLastPos(fTree);
calcFollowPos(fTree);
if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "pos")) {
RBBIDebugPuts("\n");
printPosSets(fTree);
}
//
// For "chained" rules, modify the followPos sets
//
if (fRB->fChainRules) {
calcChainedFollowPos(fTree);
}
//
// BOF (start of input) test fixup.
//
if (fRB->fSetBuilder->sawBOF()) {
bofFixup();
}
//
// Build the DFA state transition tables.
//
buildStateTable();
flagAcceptingStates();
flagLookAheadStates();
flagTaggedStates();
//
// Update the global table of rule status {tag} values
// The rule builder has a global vector of status values that are common
// for all tables. Merge the ones from this table into the global set.
//
mergeRuleStatusVals();
if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "states")) {printStates();};
}
//-----------------------------------------------------------------------------
//
// calcNullable. Impossible to explain succinctly. See Aho, section 3.9
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::calcNullable(RBBINode *n) {
if (n == NULL) {
return;
}
if (n->fType == RBBINode::setRef ||
n->fType == RBBINode::endMark ) {
// These are non-empty leaf node types.
n->fNullable = FALSE;
return;
}
if (n->fType == RBBINode::lookAhead || n->fType == RBBINode::tag) {
// Lookahead marker node. It's a leaf, so no recursion on children.
// It's nullable because it does not match any literal text from the input stream.
n->fNullable = TRUE;
return;
}
// The node is not a leaf.
// Calculate nullable on its children.
calcNullable(n->fLeftChild);
calcNullable(n->fRightChild);
// Apply functions from table 3.40 in Aho
if (n->fType == RBBINode::opOr) {
n->fNullable = n->fLeftChild->fNullable || n->fRightChild->fNullable;
}
else if (n->fType == RBBINode::opCat) {
n->fNullable = n->fLeftChild->fNullable && n->fRightChild->fNullable;
}
else if (n->fType == RBBINode::opStar || n->fType == RBBINode::opQuestion) {
n->fNullable = TRUE;
}
else {
n->fNullable = FALSE;
}
}
//-----------------------------------------------------------------------------
//
// calcFirstPos. Impossible to explain succinctly. See Aho, section 3.9
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::calcFirstPos(RBBINode *n) {
if (n == NULL) {
return;
}
if (n->fType == RBBINode::leafChar ||
n->fType == RBBINode::endMark ||
n->fType == RBBINode::lookAhead ||
n->fType == RBBINode::tag) {
// These are non-empty leaf node types.
// Note: In order to maintain the sort invariant on the set,
// this function should only be called on a node whose set is
// empty to start with.
n->fFirstPosSet->addElement(n, *fStatus);
return;
}
// The node is not a leaf.
// Calculate firstPos on its children.
calcFirstPos(n->fLeftChild);
calcFirstPos(n->fRightChild);
// Apply functions from table 3.40 in Aho
if (n->fType == RBBINode::opOr) {
setAdd(n->fFirstPosSet, n->fLeftChild->fFirstPosSet);
setAdd(n->fFirstPosSet, n->fRightChild->fFirstPosSet);
}
else if (n->fType == RBBINode::opCat) {
setAdd(n->fFirstPosSet, n->fLeftChild->fFirstPosSet);
if (n->fLeftChild->fNullable) {
setAdd(n->fFirstPosSet, n->fRightChild->fFirstPosSet);
}
}
else if (n->fType == RBBINode::opStar ||
n->fType == RBBINode::opQuestion ||
n->fType == RBBINode::opPlus) {
setAdd(n->fFirstPosSet, n->fLeftChild->fFirstPosSet);
}
}
//-----------------------------------------------------------------------------
//
// calcLastPos. Impossible to explain succinctly. See Aho, section 3.9
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::calcLastPos(RBBINode *n) {
if (n == NULL) {
return;
}
if (n->fType == RBBINode::leafChar ||
n->fType == RBBINode::endMark ||
n->fType == RBBINode::lookAhead ||
n->fType == RBBINode::tag) {
// These are non-empty leaf node types.
// Note: In order to maintain the sort invariant on the set,
// this function should only be called on a node whose set is
// empty to start with.
n->fLastPosSet->addElement(n, *fStatus);
return;
}
// The node is not a leaf.
// Calculate lastPos on its children.
calcLastPos(n->fLeftChild);
calcLastPos(n->fRightChild);
// Apply functions from table 3.40 in Aho
if (n->fType == RBBINode::opOr) {
setAdd(n->fLastPosSet, n->fLeftChild->fLastPosSet);
setAdd(n->fLastPosSet, n->fRightChild->fLastPosSet);
}
else if (n->fType == RBBINode::opCat) {
setAdd(n->fLastPosSet, n->fRightChild->fLastPosSet);
if (n->fRightChild->fNullable) {
setAdd(n->fLastPosSet, n->fLeftChild->fLastPosSet);
}
}
else if (n->fType == RBBINode::opStar ||
n->fType == RBBINode::opQuestion ||
n->fType == RBBINode::opPlus) {
setAdd(n->fLastPosSet, n->fLeftChild->fLastPosSet);
}
}
//-----------------------------------------------------------------------------
//
// calcFollowPos. Impossible to explain succinctly. See Aho, section 3.9
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::calcFollowPos(RBBINode *n) {
if (n == NULL ||
n->fType == RBBINode::leafChar ||
n->fType == RBBINode::endMark) {
return;
}
calcFollowPos(n->fLeftChild);
calcFollowPos(n->fRightChild);
// Aho rule #1
if (n->fType == RBBINode::opCat) {
RBBINode *i; // is 'i' in Aho's description
uint32_t ix;
UVector *LastPosOfLeftChild = n->fLeftChild->fLastPosSet;
for (ix=0; ix<(uint32_t)LastPosOfLeftChild->size(); ix++) {
i = (RBBINode *)LastPosOfLeftChild->elementAt(ix);
setAdd(i->fFollowPos, n->fRightChild->fFirstPosSet);
}
}
// Aho rule #2
if (n->fType == RBBINode::opStar ||
n->fType == RBBINode::opPlus) {
RBBINode *i; // again, n and i are the names from Aho's description.
uint32_t ix;
for (ix=0; ix<(uint32_t)n->fLastPosSet->size(); ix++) {
i = (RBBINode *)n->fLastPosSet->elementAt(ix);
setAdd(i->fFollowPos, n->fFirstPosSet);
}
}
}
//-----------------------------------------------------------------------------
//
// calcChainedFollowPos. Modify the previously calculated followPos sets
// to implement rule chaining. NOT described by Aho
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::calcChainedFollowPos(RBBINode *tree) {
UVector endMarkerNodes(*fStatus);
UVector leafNodes(*fStatus);
int32_t i;
if (U_FAILURE(*fStatus)) {
return;
}
// get a list of all endmarker nodes.
tree->findNodes(&endMarkerNodes, RBBINode::endMark, *fStatus);
// get a list all leaf nodes
tree->findNodes(&leafNodes, RBBINode::leafChar, *fStatus);
if (U_FAILURE(*fStatus)) {
return;
}
// Get all nodes that can be the start a match, which is FirstPosition()
// of the portion of the tree corresponding to user-written rules.
// See the tree description in bofFixup().
RBBINode *userRuleRoot = tree;
if (fRB->fSetBuilder->sawBOF()) {
userRuleRoot = tree->fLeftChild->fRightChild;
}
U_ASSERT(userRuleRoot != NULL);
UVector *matchStartNodes = userRuleRoot->fFirstPosSet;
// Iteratate over all leaf nodes,
//
int32_t endNodeIx;
int32_t startNodeIx;
for (endNodeIx=0; endNodeIx<leafNodes.size(); endNodeIx++) {
RBBINode *tNode = (RBBINode *)leafNodes.elementAt(endNodeIx);
RBBINode *endNode = NULL;
// Identify leaf nodes that correspond to overall rule match positions.
// These include an endMarkerNode in their followPos sets.
for (i=0; i<endMarkerNodes.size(); i++) {
if (tNode->fFollowPos->contains(endMarkerNodes.elementAt(i))) {
endNode = tNode;
break;
}
}
if (endNode == NULL) {
// node wasn't an end node. Try again with the next.
continue;
}
// We've got a node that can end a match.
// Line Break Specific hack: If this node's val correspond to the $CM char class,
// don't chain from it.
// TODO: Add rule syntax for this behavior, get specifics out of here and
// into the rule file.
if (fRB->fLBCMNoChain) {
UChar32 c = this->fRB->fSetBuilder->getFirstChar(endNode->fVal);
if (c != -1) {
// c == -1 occurs with sets containing only the {eof} marker string.
ULineBreak cLBProp = (ULineBreak)u_getIntPropertyValue(c, UCHAR_LINE_BREAK);
if (cLBProp == U_LB_COMBINING_MARK) {
continue;
}
}
}
// Now iterate over the nodes that can start a match, looking for ones
// with the same char class as our ending node.
RBBINode *startNode;
for (startNodeIx = 0; startNodeIx<matchStartNodes->size(); startNodeIx++) {
startNode = (RBBINode *)matchStartNodes->elementAt(startNodeIx);
if (startNode->fType != RBBINode::leafChar) {
continue;
}
if (endNode->fVal == startNode->fVal) {
// The end val (character class) of one possible match is the
// same as the start of another.
// Add all nodes from the followPos of the start node to the
// followPos set of the end node, which will have the effect of
// letting matches transition from a match state at endNode
// to the second char of a match starting with startNode.
setAdd(endNode->fFollowPos, startNode->fFollowPos);
}
}
}
}
//-----------------------------------------------------------------------------
//
// bofFixup. Fixup for state tables that include {bof} beginning of input testing.
// Do an swizzle similar to chaining, modifying the followPos set of
// the bofNode to include the followPos nodes from other {bot} nodes
// scattered through the tree.
//
// This function has much in common with calcChainedFollowPos().
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::bofFixup() {
if (U_FAILURE(*fStatus)) {
return;
}
// The parse tree looks like this ...
// fTree root ---> <cat>
// / \ .
// <cat> <#end node>
// / \ .
// <bofNode> rest
// of tree
//
// We will be adding things to the followPos set of the <bofNode>
//
RBBINode *bofNode = fTree->fLeftChild->fLeftChild;
U_ASSERT(bofNode->fType == RBBINode::leafChar);
U_ASSERT(bofNode->fVal == 2);
// Get all nodes that can be the start a match of the user-written rules
// (excluding the fake bofNode)
// We want the nodes that can start a match in the
// part labeled "rest of tree"
//
UVector *matchStartNodes = fTree->fLeftChild->fRightChild->fFirstPosSet;
RBBINode *startNode;
int startNodeIx;
for (startNodeIx = 0; startNodeIx<matchStartNodes->size(); startNodeIx++) {
startNode = (RBBINode *)matchStartNodes->elementAt(startNodeIx);
if (startNode->fType != RBBINode::leafChar) {
continue;
}
if (startNode->fVal == bofNode->fVal) {
// We found a leaf node corresponding to a {bof} that was
// explicitly written into a rule.
// Add everything from the followPos set of this node to the
// followPos set of the fake bofNode at the start of the tree.
//
setAdd(bofNode->fFollowPos, startNode->fFollowPos);
}
}
}
//-----------------------------------------------------------------------------
//
// buildStateTable() Determine the set of runtime DFA states and the
// transition tables for these states, by the algorithm
// of fig. 3.44 in Aho.
//
// Most of the comments are quotes of Aho's psuedo-code.
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::buildStateTable() {
if (U_FAILURE(*fStatus)) {
return;
}
RBBIStateDescriptor *failState;
// Set it to NULL to avoid uninitialized warning
RBBIStateDescriptor *initialState = NULL;
//
// Add a dummy state 0 - the stop state. Not from Aho.
int lastInputSymbol = fRB->fSetBuilder->getNumCharCategories() - 1;
failState = new RBBIStateDescriptor(lastInputSymbol, fStatus);
if (failState == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
goto ExitBuildSTdeleteall;
}
failState->fPositions = new UVector(*fStatus);
if (failState->fPositions == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
}
if (failState->fPositions == NULL || U_FAILURE(*fStatus)) {
goto ExitBuildSTdeleteall;
}
fDStates->addElement(failState, *fStatus);
if (U_FAILURE(*fStatus)) {
goto ExitBuildSTdeleteall;
}
// initially, the only unmarked state in Dstates is firstpos(root),
// where toot is the root of the syntax tree for (r)#;
initialState = new RBBIStateDescriptor(lastInputSymbol, fStatus);
if (initialState == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
}
if (U_FAILURE(*fStatus)) {
goto ExitBuildSTdeleteall;
}
initialState->fPositions = new UVector(*fStatus);
if (initialState->fPositions == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
}
if (U_FAILURE(*fStatus)) {
goto ExitBuildSTdeleteall;
}
setAdd(initialState->fPositions, fTree->fFirstPosSet);
fDStates->addElement(initialState, *fStatus);
if (U_FAILURE(*fStatus)) {
goto ExitBuildSTdeleteall;
}
// while there is an unmarked state T in Dstates do begin
for (;;) {
RBBIStateDescriptor *T = NULL;
int32_t tx;
for (tx=1; tx<fDStates->size(); tx++) {
RBBIStateDescriptor *temp;
temp = (RBBIStateDescriptor *)fDStates->elementAt(tx);
if (temp->fMarked == FALSE) {
T = temp;
break;
}
}
if (T == NULL) {
break;
}
// mark T;
T->fMarked = TRUE;
// for each input symbol a do begin
int32_t a;
for (a = 1; a<=lastInputSymbol; a++) {
// let U be the set of positions that are in followpos(p)
// for some position p in T
// such that the symbol at position p is a;
UVector *U = NULL;
RBBINode *p;
int32_t px;
for (px=0; px<T->fPositions->size(); px++) {
p = (RBBINode *)T->fPositions->elementAt(px);
if ((p->fType == RBBINode::leafChar) && (p->fVal == a)) {
if (U == NULL) {
U = new UVector(*fStatus);
if (U == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
goto ExitBuildSTdeleteall;
}
}
setAdd(U, p->fFollowPos);
}
}
// if U is not empty and not in DStates then
int32_t ux = 0;
UBool UinDstates = FALSE;
if (U != NULL) {
U_ASSERT(U->size() > 0);
int ix;
for (ix=0; ix<fDStates->size(); ix++) {
RBBIStateDescriptor *temp2;
temp2 = (RBBIStateDescriptor *)fDStates->elementAt(ix);
if (setEquals(U, temp2->fPositions)) {
delete U;
U = temp2->fPositions;
ux = ix;
UinDstates = TRUE;
break;
}
}
// Add U as an unmarked state to Dstates
if (!UinDstates)
{
RBBIStateDescriptor *newState = new RBBIStateDescriptor(lastInputSymbol, fStatus);
if (newState == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
}
if (U_FAILURE(*fStatus)) {
goto ExitBuildSTdeleteall;
}
newState->fPositions = U;
fDStates->addElement(newState, *fStatus);
if (U_FAILURE(*fStatus)) {
return;
}
ux = fDStates->size()-1;
}
// Dtran[T, a] := U;
T->fDtran->setElementAt(ux, a);
}
}
}
return;
// delete local pointers only if error occured.
ExitBuildSTdeleteall:
delete initialState;
delete failState;
}
//-----------------------------------------------------------------------------
//
// flagAcceptingStates Identify accepting states.
// First get a list of all of the end marker nodes.
// Then, for each state s,
// if s contains one of the end marker nodes in its list of tree positions then
// s is an accepting state.
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::flagAcceptingStates() {
if (U_FAILURE(*fStatus)) {
return;
}
UVector endMarkerNodes(*fStatus);
RBBINode *endMarker;
int32_t i;
int32_t n;
if (U_FAILURE(*fStatus)) {
return;
}
fTree->findNodes(&endMarkerNodes, RBBINode::endMark, *fStatus);
if (U_FAILURE(*fStatus)) {
return;
}
for (i=0; i<endMarkerNodes.size(); i++) {
endMarker = (RBBINode *)endMarkerNodes.elementAt(i);
for (n=0; n<fDStates->size(); n++) {
RBBIStateDescriptor *sd = (RBBIStateDescriptor *)fDStates->elementAt(n);
if (sd->fPositions->indexOf(endMarker) >= 0) {
// Any non-zero value for fAccepting means this is an accepting node.
// The value is what will be returned to the user as the break status.
// If no other value was specified, force it to -1.
if (sd->fAccepting==0) {
// State hasn't been marked as accepting yet. Do it now.
sd->fAccepting = endMarker->fVal;
if (sd->fAccepting == 0) {
sd->fAccepting = -1;
}
}
if (sd->fAccepting==-1 && endMarker->fVal != 0) {
// Both lookahead and non-lookahead accepting for this state.
// Favor the look-ahead. Expedient for line break.
// TODO: need a more elegant resolution for conflicting rules.
sd->fAccepting = endMarker->fVal;
}
// implicit else:
// if sd->fAccepting already had a value other than 0 or -1, leave it be.
// If the end marker node is from a look-ahead rule, set
// the fLookAhead field or this state also.
if (endMarker->fLookAheadEnd) {
// TODO: don't change value if already set?
// TODO: allow for more than one active look-ahead rule in engine.
// Make value here an index to a side array in engine?
sd->fLookAhead = sd->fAccepting;
}
}
}
}
}
//-----------------------------------------------------------------------------
//
// flagLookAheadStates Very similar to flagAcceptingStates, above.
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::flagLookAheadStates() {
if (U_FAILURE(*fStatus)) {
return;
}
UVector lookAheadNodes(*fStatus);
RBBINode *lookAheadNode;
int32_t i;
int32_t n;
fTree->findNodes(&lookAheadNodes, RBBINode::lookAhead, *fStatus);
if (U_FAILURE(*fStatus)) {
return;
}
for (i=0; i<lookAheadNodes.size(); i++) {
lookAheadNode = (RBBINode *)lookAheadNodes.elementAt(i);
for (n=0; n<fDStates->size(); n++) {
RBBIStateDescriptor *sd = (RBBIStateDescriptor *)fDStates->elementAt(n);
if (sd->fPositions->indexOf(lookAheadNode) >= 0) {
sd->fLookAhead = lookAheadNode->fVal;
}
}
}
}
//-----------------------------------------------------------------------------
//
// flagTaggedStates
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::flagTaggedStates() {
if (U_FAILURE(*fStatus)) {
return;
}
UVector tagNodes(*fStatus);
RBBINode *tagNode;
int32_t i;
int32_t n;
if (U_FAILURE(*fStatus)) {
return;
}
fTree->findNodes(&tagNodes, RBBINode::tag, *fStatus);
if (U_FAILURE(*fStatus)) {
return;
}
for (i=0; i<tagNodes.size(); i++) { // For each tag node t (all of 'em)
tagNode = (RBBINode *)tagNodes.elementAt(i);
for (n=0; n<fDStates->size(); n++) { // For each state s (row in the state table)
RBBIStateDescriptor *sd = (RBBIStateDescriptor *)fDStates->elementAt(n);
if (sd->fPositions->indexOf(tagNode) >= 0) { // if s include the tag node t
sortedAdd(&sd->fTagVals, tagNode->fVal);
}
}
}
}
//-----------------------------------------------------------------------------
//
// mergeRuleStatusVals
//
// Update the global table of rule status {tag} values
// The rule builder has a global vector of status values that are common
// for all tables. Merge the ones from this table into the global set.
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::mergeRuleStatusVals() {
//
// The basic outline of what happens here is this...
//
// for each state in this state table
// if the status tag list for this state is in the global statuses list
// record where and
// continue with the next state
// else
// add the tag list for this state to the global list.
//
int i;
int n;
// Pre-set a single tag of {0} into the table.
// We will need this as a default, for rule sets with no explicit tagging.
if (fRB->fRuleStatusVals->size() == 0) {
fRB->fRuleStatusVals->addElement(1, *fStatus); // Num of statuses in group
fRB->fRuleStatusVals->addElement((int32_t)0, *fStatus); // and our single status of zero
}
// For each state
for (n=0; n<fDStates->size(); n++) {
RBBIStateDescriptor *sd = (RBBIStateDescriptor *)fDStates->elementAt(n);
UVector *thisStatesTagValues = sd->fTagVals;
if (thisStatesTagValues == NULL) {
// No tag values are explicitly associated with this state.
// Set the default tag value.
sd->fTagsIdx = 0;
continue;
}
// There are tag(s) associated with this state.
// fTagsIdx will be the index into the global tag list for this state's tag values.
// Initial value of -1 flags that we haven't got it set yet.
sd->fTagsIdx = -1;
int32_t thisTagGroupStart = 0; // indexes into the global rule status vals list
int32_t nextTagGroupStart = 0;
// Loop runs once per group of tags in the global list
while (nextTagGroupStart < fRB->fRuleStatusVals->size()) {
thisTagGroupStart = nextTagGroupStart;
nextTagGroupStart += fRB->fRuleStatusVals->elementAti(thisTagGroupStart) + 1;
if (thisStatesTagValues->size() != fRB->fRuleStatusVals->elementAti(thisTagGroupStart)) {
// The number of tags for this state is different from
// the number of tags in this group from the global list.
// Continue with the next group from the global list.
continue;
}
// The lengths match, go ahead and compare the actual tag values
// between this state and the group from the global list.
for (i=0; i<thisStatesTagValues->size(); i++) {
if (thisStatesTagValues->elementAti(i) !=
fRB->fRuleStatusVals->elementAti(thisTagGroupStart + 1 + i) ) {
// Mismatch.
break;
}
}
if (i == thisStatesTagValues->size()) {
// We found a set of tag values in the global list that match
// those for this state. Use them.
sd->fTagsIdx = thisTagGroupStart;
break;
}
}
if (sd->fTagsIdx == -1) {
// No suitable entry in the global tag list already. Add one
sd->fTagsIdx = fRB->fRuleStatusVals->size();
fRB->fRuleStatusVals->addElement(thisStatesTagValues->size(), *fStatus);
for (i=0; i<thisStatesTagValues->size(); i++) {
fRB->fRuleStatusVals->addElement(thisStatesTagValues->elementAti(i), *fStatus);
}
}
}
}
//-----------------------------------------------------------------------------
//
// sortedAdd Add a value to a vector of sorted values (ints).
// Do not replicate entries; if the value is already there, do not
// add a second one.
// Lazily create the vector if it does not already exist.
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::sortedAdd(UVector **vector, int32_t val) {
int32_t i;
if (*vector == NULL) {
*vector = new UVector(*fStatus);
}
if (*vector == NULL || U_FAILURE(*fStatus)) {
return;
}
UVector *vec = *vector;
int32_t vSize = vec->size();
for (i=0; i<vSize; i++) {
int32_t valAtI = vec->elementAti(i);
if (valAtI == val) {
// The value is already in the vector. Don't add it again.
return;
}
if (valAtI > val) {
break;
}
}
vec->insertElementAt(val, i, *fStatus);
}
//-----------------------------------------------------------------------------
//
// setAdd Set operation on UVector
// dest = dest union source
// Elements may only appear once and must be sorted.
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::setAdd(UVector *dest, UVector *source) {
int32_t destOriginalSize = dest->size();
int32_t sourceSize = source->size();
int32_t di = 0;
MaybeStackArray<void *, 16> destArray, sourceArray; // Handle small cases without malloc
void **destPtr, **sourcePtr;
void **destLim, **sourceLim;
if (destOriginalSize > destArray.getCapacity()) {
if (destArray.resize(destOriginalSize) == NULL) {
return;
}
}
destPtr = destArray.getAlias();
destLim = destPtr + destOriginalSize; // destArray.getArrayLimit()?
if (sourceSize > sourceArray.getCapacity()) {
if (sourceArray.resize(sourceSize) == NULL) {
return;
}
}
sourcePtr = sourceArray.getAlias();
sourceLim = sourcePtr + sourceSize; // sourceArray.getArrayLimit()?
// Avoid multiple "get element" calls by getting the contents into arrays
(void) dest->toArray(destPtr);
(void) source->toArray(sourcePtr);
dest->setSize(sourceSize+destOriginalSize, *fStatus);
while (sourcePtr < sourceLim && destPtr < destLim) {
if (*destPtr == *sourcePtr) {
dest->setElementAt(*sourcePtr++, di++);
destPtr++;
}
// This check is required for machines with segmented memory, like i5/OS.
// Direct pointer comparison is not recommended.
else if (uprv_memcmp(destPtr, sourcePtr, sizeof(void *)) < 0) {
dest->setElementAt(*destPtr++, di++);
}
else { /* *sourcePtr < *destPtr */
dest->setElementAt(*sourcePtr++, di++);
}
}
// At most one of these two cleanup loops will execute
while (destPtr < destLim) {
dest->setElementAt(*destPtr++, di++);
}
while (sourcePtr < sourceLim) {
dest->setElementAt(*sourcePtr++, di++);
}
dest->setSize(di, *fStatus);
}
//-----------------------------------------------------------------------------
//
// setEqual Set operation on UVector.
// Compare for equality.
// Elements must be sorted.
//
//-----------------------------------------------------------------------------
UBool RBBITableBuilder::setEquals(UVector *a, UVector *b) {
return a->equals(*b);
}
//-----------------------------------------------------------------------------
//
// printPosSets Debug function. Dump Nullable, firstpos, lastpos and followpos
// for each node in the tree.
//
//-----------------------------------------------------------------------------
#ifdef RBBI_DEBUG
void RBBITableBuilder::printPosSets(RBBINode *n) {
if (n==NULL) {
return;
}
n->printNode();
RBBIDebugPrintf(" Nullable: %s\n", n->fNullable?"TRUE":"FALSE");
RBBIDebugPrintf(" firstpos: ");
printSet(n->fFirstPosSet);
RBBIDebugPrintf(" lastpos: ");
printSet(n->fLastPosSet);
RBBIDebugPrintf(" followpos: ");
printSet(n->fFollowPos);
printPosSets(n->fLeftChild);
printPosSets(n->fRightChild);
}
#endif
//-----------------------------------------------------------------------------
//
// getTableSize() Calculate the size of the runtime form of this
// state transition table.
//
//-----------------------------------------------------------------------------
int32_t RBBITableBuilder::getTableSize() const {
int32_t size = 0;
int32_t numRows;
int32_t numCols;
int32_t rowSize;
if (fTree == NULL) {
return 0;
}
size = sizeof(RBBIStateTable) - 4; // The header, with no rows to the table.
numRows = fDStates->size();
numCols = fRB->fSetBuilder->getNumCharCategories();
// Note The declaration of RBBIStateTableRow is for a table of two columns.
// Therefore we subtract two from numCols when determining
// how much storage to add to a row for the total columns.
rowSize = sizeof(RBBIStateTableRow) + sizeof(uint16_t)*(numCols-2);
size += numRows * rowSize;
return size;
}
//-----------------------------------------------------------------------------
//
// exportTable() export the state transition table in the format required
// by the runtime engine. getTableSize() bytes of memory
// must be available at the output address "where".
//
//-----------------------------------------------------------------------------
void RBBITableBuilder::exportTable(void *where) {
RBBIStateTable *table = (RBBIStateTable *)where;
uint32_t state;
int col;
if (U_FAILURE(*fStatus) || fTree == NULL) {
return;
}
if (fRB->fSetBuilder->getNumCharCategories() > 0x7fff ||
fDStates->size() > 0x7fff) {
*fStatus = U_BRK_INTERNAL_ERROR;
return;
}
table->fRowLen = sizeof(RBBIStateTableRow) +
sizeof(uint16_t) * (fRB->fSetBuilder->getNumCharCategories() - 2);
table->fNumStates = fDStates->size();
table->fFlags = 0;
if (fRB->fLookAheadHardBreak) {
table->fFlags |= RBBI_LOOKAHEAD_HARD_BREAK;
}
if (fRB->fSetBuilder->sawBOF()) {
table->fFlags |= RBBI_BOF_REQUIRED;
}
table->fReserved = 0;
for (state=0; state<table->fNumStates; state++) {
RBBIStateDescriptor *sd = (RBBIStateDescriptor *)fDStates->elementAt(state);
RBBIStateTableRow *row = (RBBIStateTableRow *)(table->fTableData + state*table->fRowLen);
U_ASSERT (-32768 < sd->fAccepting && sd->fAccepting <= 32767);
U_ASSERT (-32768 < sd->fLookAhead && sd->fLookAhead <= 32767);
row->fAccepting = (int16_t)sd->fAccepting;
row->fLookAhead = (int16_t)sd->fLookAhead;
row->fTagIdx = (int16_t)sd->fTagsIdx;
for (col=0; col<fRB->fSetBuilder->getNumCharCategories(); col++) {
row->fNextState[col] = (uint16_t)sd->fDtran->elementAti(col);
}
}
}
//-----------------------------------------------------------------------------
//
// printSet Debug function. Print the contents of a UVector
//
//-----------------------------------------------------------------------------
#ifdef RBBI_DEBUG
void RBBITableBuilder::printSet(UVector *s) {
int32_t i;
for (i=0; i<s->size(); i++) {
void *v = s->elementAt(i);
RBBIDebugPrintf("%10p", v);
}
RBBIDebugPrintf("\n");
}
#endif
//-----------------------------------------------------------------------------
//
// printStates Debug Function. Dump the fully constructed state transition table.
//
//-----------------------------------------------------------------------------
#ifdef RBBI_DEBUG
void RBBITableBuilder::printStates() {
int c; // input "character"
int n; // state number
RBBIDebugPrintf("state | i n p u t s y m b o l s \n");
RBBIDebugPrintf(" | Acc LA Tag");
for (c=0; c<fRB->fSetBuilder->getNumCharCategories(); c++) {
RBBIDebugPrintf(" %2d", c);
}
RBBIDebugPrintf("\n");
RBBIDebugPrintf(" |---------------");
for (c=0; c<fRB->fSetBuilder->getNumCharCategories(); c++) {
RBBIDebugPrintf("---");
}
RBBIDebugPrintf("\n");
for (n=0; n<fDStates->size(); n++) {
RBBIStateDescriptor *sd = (RBBIStateDescriptor *)fDStates->elementAt(n);
RBBIDebugPrintf(" %3d | " , n);
RBBIDebugPrintf("%3d %3d %5d ", sd->fAccepting, sd->fLookAhead, sd->fTagsIdx);
for (c=0; c<fRB->fSetBuilder->getNumCharCategories(); c++) {
RBBIDebugPrintf(" %2d", sd->fDtran->elementAti(c));
}
RBBIDebugPrintf("\n");
}
RBBIDebugPrintf("\n\n");
}
#endif
//-----------------------------------------------------------------------------
//
// printRuleStatusTable Debug Function. Dump the common rule status table
//
//-----------------------------------------------------------------------------
#ifdef RBBI_DEBUG
void RBBITableBuilder::printRuleStatusTable() {
int32_t thisRecord = 0;
int32_t nextRecord = 0;
int i;
UVector *tbl = fRB->fRuleStatusVals;
RBBIDebugPrintf("index | tags \n");
RBBIDebugPrintf("-------------------\n");
while (nextRecord < tbl->size()) {
thisRecord = nextRecord;
nextRecord = thisRecord + tbl->elementAti(thisRecord) + 1;
RBBIDebugPrintf("%4d ", thisRecord);
for (i=thisRecord+1; i<nextRecord; i++) {
RBBIDebugPrintf(" %5d", tbl->elementAti(i));
}
RBBIDebugPrintf("\n");
}
RBBIDebugPrintf("\n\n");
}
#endif
//-----------------------------------------------------------------------------
//
// RBBIStateDescriptor Methods. This is a very struct-like class
// Most access is directly to the fields.
//
//-----------------------------------------------------------------------------
RBBIStateDescriptor::RBBIStateDescriptor(int lastInputSymbol, UErrorCode *fStatus) {
fMarked = FALSE;
fAccepting = 0;
fLookAhead = 0;
fTagsIdx = 0;
fTagVals = NULL;
fPositions = NULL;
fDtran = NULL;
fDtran = new UVector(lastInputSymbol+1, *fStatus);
if (U_FAILURE(*fStatus)) {
return;
}
if (fDtran == NULL) {
*fStatus = U_MEMORY_ALLOCATION_ERROR;
return;
}
fDtran->setSize(lastInputSymbol+1, *fStatus); // fDtran needs to be pre-sized.
// It is indexed by input symbols, and will
// hold the next state number for each
// symbol.
}
RBBIStateDescriptor::~RBBIStateDescriptor() {
delete fPositions;
delete fDtran;
delete fTagVals;
fPositions = NULL;
fDtran = NULL;
fTagVals = NULL;
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_BREAK_ITERATION */