359 lines
11 KiB
C++
359 lines
11 KiB
C++
/*
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***************************************************************************
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* Copyright (C) 2002-2008 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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// File: rbbinode.cpp
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//
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// Implementation of class RBBINode, which represents a node in the
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// tree generated when parsing the Rules Based Break Iterator rules.
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//
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// This "Class" is actually closer to a struct.
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// Code using it is expected to directly access fields much of the time.
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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/unistr.h"
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#include "unicode/uniset.h"
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#include "unicode/uchar.h"
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#include "unicode/parsepos.h"
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#include "uvector.h"
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#include "rbbirb.h"
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#include "rbbinode.h"
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#include "uassert.h"
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U_NAMESPACE_BEGIN
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#ifdef RBBI_DEBUG
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static int gLastSerial = 0;
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#endif
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//-------------------------------------------------------------------------
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//
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// Constructor. Just set the fields to reasonable default values.
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//
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//-------------------------------------------------------------------------
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RBBINode::RBBINode(NodeType t) : UMemory() {
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#ifdef RBBI_DEBUG
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fSerialNum = ++gLastSerial;
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#endif
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fType = t;
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fParent = NULL;
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fLeftChild = NULL;
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fRightChild = NULL;
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fInputSet = NULL;
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fFirstPos = 0;
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fLastPos = 0;
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fNullable = FALSE;
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fLookAheadEnd = FALSE;
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fVal = 0;
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fPrecedence = precZero;
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UErrorCode status = U_ZERO_ERROR;
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fFirstPosSet = new UVector(status); // TODO - get a real status from somewhere
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fLastPosSet = new UVector(status);
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fFollowPos = new UVector(status);
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if (t==opCat) {fPrecedence = precOpCat;}
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else if (t==opOr) {fPrecedence = precOpOr;}
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else if (t==opStart) {fPrecedence = precStart;}
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else if (t==opLParen) {fPrecedence = precLParen;}
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}
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RBBINode::RBBINode(const RBBINode &other) : UMemory(other) {
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#ifdef RBBI_DEBUG
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fSerialNum = ++gLastSerial;
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#endif
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fType = other.fType;
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fParent = NULL;
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fLeftChild = NULL;
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fRightChild = NULL;
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fInputSet = other.fInputSet;
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fPrecedence = other.fPrecedence;
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fText = other.fText;
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fFirstPos = other.fFirstPos;
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fLastPos = other.fLastPos;
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fNullable = other.fNullable;
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fVal = other.fVal;
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UErrorCode status = U_ZERO_ERROR;
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fFirstPosSet = new UVector(status); // TODO - get a real status from somewhere
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fLastPosSet = new UVector(status);
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fFollowPos = new UVector(status);
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}
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//-------------------------------------------------------------------------
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//
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// Destructor. Deletes both this node AND any child nodes,
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// except in the case of variable reference nodes. For
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// these, the l. child points back to the definition, which
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// is common for all references to the variable, meaning
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// it can't be deleted here.
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//
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//-------------------------------------------------------------------------
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RBBINode::~RBBINode() {
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// printf("deleting node %8x serial %4d\n", this, this->fSerialNum);
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delete fInputSet;
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fInputSet = NULL;
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switch (this->fType) {
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case varRef:
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case setRef:
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// for these node types, multiple instances point to the same "children"
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// Storage ownership of children handled elsewhere. Don't delete here.
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break;
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default:
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delete fLeftChild;
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fLeftChild = NULL;
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delete fRightChild;
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fRightChild = NULL;
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}
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delete fFirstPosSet;
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delete fLastPosSet;
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delete fFollowPos;
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}
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//-------------------------------------------------------------------------
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//
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// cloneTree Make a copy of the subtree rooted at this node.
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// Discard any variable references encountered along the way,
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// and replace with copies of the variable's definitions.
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// Used to replicate the expression underneath variable
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// references in preparation for generating the DFA tables.
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//
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//-------------------------------------------------------------------------
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RBBINode *RBBINode::cloneTree() {
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RBBINode *n;
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if (fType == RBBINode::varRef) {
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// If the current node is a variable reference, skip over it
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// and clone the definition of the variable instead.
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n = fLeftChild->cloneTree();
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} else if (fType == RBBINode::uset) {
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n = this;
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} else {
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n = new RBBINode(*this);
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// Check for null pointer.
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if (n != NULL) {
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if (fLeftChild != NULL) {
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n->fLeftChild = fLeftChild->cloneTree();
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n->fLeftChild->fParent = n;
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}
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if (fRightChild != NULL) {
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n->fRightChild = fRightChild->cloneTree();
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n->fRightChild->fParent = n;
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}
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}
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}
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return n;
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}
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//-------------------------------------------------------------------------
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//
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// flattenVariables Walk a parse tree, replacing any variable
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// references with a copy of the variable's definition.
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// Aside from variables, the tree is not changed.
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//
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// Return the root of the tree. If the root was not a variable
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// reference, it remains unchanged - the root we started with
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// is the root we return. If, however, the root was a variable
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// reference, the root of the newly cloned replacement tree will
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// be returned, and the original tree deleted.
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//
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// This function works by recursively walking the tree
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// without doing anything until a variable reference is
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// found, then calling cloneTree() at that point. Any
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// nested references are handled by cloneTree(), not here.
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//
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//-------------------------------------------------------------------------
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RBBINode *RBBINode::flattenVariables() {
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if (fType == varRef) {
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RBBINode *retNode = fLeftChild->cloneTree();
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delete this;
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return retNode;
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}
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if (fLeftChild != NULL) {
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fLeftChild = fLeftChild->flattenVariables();
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fLeftChild->fParent = this;
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}
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if (fRightChild != NULL) {
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fRightChild = fRightChild->flattenVariables();
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fRightChild->fParent = this;
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}
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return this;
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}
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//-------------------------------------------------------------------------
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//
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// flattenSets Walk the parse tree, replacing any nodes of type setRef
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// with a copy of the expression tree for the set. A set's
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// equivalent expression tree is precomputed and saved as
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// the left child of the uset node.
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//
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//-------------------------------------------------------------------------
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void RBBINode::flattenSets() {
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U_ASSERT(fType != setRef);
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if (fLeftChild != NULL) {
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if (fLeftChild->fType==setRef) {
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RBBINode *setRefNode = fLeftChild;
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RBBINode *usetNode = setRefNode->fLeftChild;
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RBBINode *replTree = usetNode->fLeftChild;
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fLeftChild = replTree->cloneTree();
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fLeftChild->fParent = this;
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delete setRefNode;
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} else {
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fLeftChild->flattenSets();
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}
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}
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if (fRightChild != NULL) {
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if (fRightChild->fType==setRef) {
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RBBINode *setRefNode = fRightChild;
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RBBINode *usetNode = setRefNode->fLeftChild;
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RBBINode *replTree = usetNode->fLeftChild;
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fRightChild = replTree->cloneTree();
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fRightChild->fParent = this;
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delete setRefNode;
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} else {
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fRightChild->flattenSets();
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}
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}
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}
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//-------------------------------------------------------------------------
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//
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// findNodes() Locate all the nodes of the specified type, starting
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// at the specified root.
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//
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//-------------------------------------------------------------------------
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void RBBINode::findNodes(UVector *dest, RBBINode::NodeType kind, UErrorCode &status) {
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/* test for buffer overflows */
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if (U_FAILURE(status)) {
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return;
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}
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if (fType == kind) {
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dest->addElement(this, status);
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}
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if (fLeftChild != NULL) {
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fLeftChild->findNodes(dest, kind, status);
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}
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if (fRightChild != NULL) {
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fRightChild->findNodes(dest, kind, status);
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}
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}
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//-------------------------------------------------------------------------
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//
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// print. Print out a single node, for debugging.
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//
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//-------------------------------------------------------------------------
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#ifdef RBBI_DEBUG
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void RBBINode::printNode() {
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static const char * const nodeTypeNames[] = {
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"setRef",
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"uset",
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"varRef",
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"leafChar",
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"lookAhead",
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"tag",
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"endMark",
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"opStart",
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"opCat",
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"opOr",
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"opStar",
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"opPlus",
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"opQuestion",
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"opBreak",
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"opReverse",
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"opLParen"
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};
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if (this==NULL) {
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RBBIDebugPrintf("%10p", (void *)this);
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} else {
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RBBIDebugPrintf("%10p %12s %10p %10p %10p %4d %6d %d ",
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(void *)this, nodeTypeNames[fType], (void *)fParent, (void *)fLeftChild, (void *)fRightChild,
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fSerialNum, fFirstPos, fVal);
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if (fType == varRef) {
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RBBI_DEBUG_printUnicodeString(fText);
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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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#ifdef RBBI_DEBUG
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U_CFUNC void RBBI_DEBUG_printUnicodeString(const UnicodeString &s, int minWidth)
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{
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int i;
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for (i=0; i<s.length(); i++) {
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RBBIDebugPrintf("%c", s.charAt(i));
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// putc(s.charAt(i), stdout);
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}
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for (i=s.length(); i<minWidth; i++) {
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RBBIDebugPrintf(" ");
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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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// print. Print out the tree of nodes rooted at "this"
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//
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//-------------------------------------------------------------------------
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#ifdef RBBI_DEBUG
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void RBBINode::printTree(UBool printHeading) {
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if (printHeading) {
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RBBIDebugPrintf( "-------------------------------------------------------------------\n"
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" Address type Parent LeftChild RightChild serial position value\n"
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);
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}
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this->printNode();
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if (this != NULL) {
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// Only dump the definition under a variable reference if asked to.
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// Unconditinally dump children of all other node types.
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if (fType != varRef) {
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if (fLeftChild != NULL) {
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fLeftChild->printTree(FALSE);
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}
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if (fRightChild != NULL) {
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fRightChild->printTree(FALSE);
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}
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}
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}
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}
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#endif
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
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