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337 lines
9.0 KiB
C++
337 lines
9.0 KiB
C++
//===- llvm/ADT/Trie.h ---- Generic trie structure --------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class defines a generic trie structure. The trie structure
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// is immutable after creation, but the payload contained within it is not.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_TRIE_H
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#define LLVM_ADT_TRIE_H
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/Support/DOTGraphTraits.h"
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#include <cassert>
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#include <vector>
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namespace llvm {
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// FIXME:
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// - Labels are usually small, maybe it's better to use SmallString
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// - Should we use char* during construction?
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// - Should we templatize Empty with traits-like interface?
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template<class Payload>
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class Trie {
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friend class GraphTraits<Trie<Payload> >;
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friend class DOTGraphTraits<Trie<Payload> >;
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public:
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class Node {
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friend class Trie;
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public:
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typedef std::vector<Node*> NodeVectorType;
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typedef typename NodeVectorType::iterator iterator;
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typedef typename NodeVectorType::const_iterator const_iterator;
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private:
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enum QueryResult {
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Same = -3,
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StringIsPrefix = -2,
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LabelIsPrefix = -1,
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DontMatch = 0,
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HaveCommonPart
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};
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struct NodeCmp {
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bool operator() (Node* N1, Node* N2) {
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return (N1->Label[0] < N2->Label[0]);
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}
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bool operator() (Node* N, char Id) {
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return (N->Label[0] < Id);
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}
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};
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std::string Label;
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Payload Data;
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NodeVectorType Children;
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// Do not implement
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Node(const Node&);
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Node& operator=(const Node&);
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inline void addEdge(Node* N) {
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if (Children.empty())
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Children.push_back(N);
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else {
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iterator I = std::lower_bound(Children.begin(), Children.end(),
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N, NodeCmp());
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// FIXME: no dups are allowed
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Children.insert(I, N);
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}
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}
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inline void setEdge(Node* N) {
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char Id = N->Label[0];
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iterator I = std::lower_bound(Children.begin(), Children.end(),
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Id, NodeCmp());
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assert(I != Children.end() && "Node does not exists!");
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*I = N;
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}
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QueryResult query(const std::string& s) const {
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unsigned i, l;
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unsigned l1 = s.length();
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unsigned l2 = Label.length();
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// Find the length of common part
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l = std::min(l1, l2);
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i = 0;
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while ((i < l) && (s[i] == Label[i]))
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++i;
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if (i == l) { // One is prefix of another, find who is who
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if (l1 == l2)
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return Same;
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else if (i == l1)
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return StringIsPrefix;
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else
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return LabelIsPrefix;
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} else // s and Label have common (possible empty) part, return its length
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return (QueryResult)i;
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}
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public:
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inline explicit Node(const Payload& data, const std::string& label = ""):
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Label(label), Data(data) { }
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inline const Payload& data() const { return Data; }
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inline void setData(const Payload& data) { Data = data; }
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inline const std::string& label() const { return Label; }
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#if 0
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inline void dump() {
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llvm::cerr << "Node: " << this << "\n"
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<< "Label: " << Label << "\n"
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<< "Children:\n";
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for (iterator I = Children.begin(), E = Children.end(); I != E; ++I)
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llvm::cerr << (*I)->Label << "\n";
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}
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#endif
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inline Node* getEdge(char Id) {
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Node* fNode = NULL;
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iterator I = std::lower_bound(Children.begin(), Children.end(),
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Id, NodeCmp());
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if (I != Children.end() && (*I)->Label[0] == Id)
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fNode = *I;
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return fNode;
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}
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inline iterator begin() { return Children.begin(); }
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inline const_iterator begin() const { return Children.begin(); }
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inline iterator end () { return Children.end(); }
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inline const_iterator end () const { return Children.end(); }
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inline size_t size () const { return Children.size(); }
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inline bool empty() const { return Children.empty(); }
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inline const Node* &front() const { return Children.front(); }
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inline Node* &front() { return Children.front(); }
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inline const Node* &back() const { return Children.back(); }
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inline Node* &back() { return Children.back(); }
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};
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private:
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std::vector<Node*> Nodes;
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Payload Empty;
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inline Node* addNode(const Payload& data, const std::string label = "") {
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Node* N = new Node(data, label);
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Nodes.push_back(N);
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return N;
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}
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inline Node* splitEdge(Node* N, char Id, size_t index) {
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Node* eNode = N->getEdge(Id);
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assert(eNode && "Node doesn't exist");
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const std::string &l = eNode->Label;
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assert(index > 0 && index < l.length() && "Trying to split too far!");
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std::string l1 = l.substr(0, index);
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std::string l2 = l.substr(index);
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Node* nNode = addNode(Empty, l1);
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N->setEdge(nNode);
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eNode->Label = l2;
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nNode->addEdge(eNode);
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return nNode;
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}
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// Do not implement
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Trie(const Trie&);
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Trie& operator=(const Trie&);
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public:
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inline explicit Trie(const Payload& empty):Empty(empty) {
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addNode(Empty);
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}
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inline ~Trie() {
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for (unsigned i = 0, e = Nodes.size(); i != e; ++i)
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delete Nodes[i];
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}
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inline Node* getRoot() const { return Nodes[0]; }
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bool addString(const std::string& s, const Payload& data);
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const Payload& lookup(const std::string& s) const;
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};
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// Define this out-of-line to dissuade the C++ compiler from inlining it.
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template<class Payload>
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bool Trie<Payload>::addString(const std::string& s, const Payload& data) {
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Node* cNode = getRoot();
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Node* tNode = NULL;
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std::string s1(s);
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while (tNode == NULL) {
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char Id = s1[0];
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if (Node* nNode = cNode->getEdge(Id)) {
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typename Node::QueryResult r = nNode->query(s1);
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switch (r) {
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case Node::Same:
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case Node::StringIsPrefix:
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// Currently we don't allow to have two strings in the trie one
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// being a prefix of another. This should be fixed.
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assert(0 && "FIXME!");
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return false;
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case Node::DontMatch:
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assert(0 && "Impossible!");
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return false;
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case Node::LabelIsPrefix:
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s1 = s1.substr(nNode->label().length());
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cNode = nNode;
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break;
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default:
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nNode = splitEdge(cNode, Id, r);
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tNode = addNode(data, s1.substr(r));
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nNode->addEdge(tNode);
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}
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} else {
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tNode = addNode(data, s1);
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cNode->addEdge(tNode);
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}
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}
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return true;
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}
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template<class Payload>
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const Payload& Trie<Payload>::lookup(const std::string& s) const {
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Node* cNode = getRoot();
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Node* tNode = NULL;
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std::string s1(s);
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while (tNode == NULL) {
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char Id = s1[0];
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if (Node* nNode = cNode->getEdge(Id)) {
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typename Node::QueryResult r = nNode->query(s1);
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switch (r) {
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case Node::Same:
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tNode = nNode;
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break;
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case Node::StringIsPrefix:
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return Empty;
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case Node::DontMatch:
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assert(0 && "Impossible!");
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return Empty;
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case Node::LabelIsPrefix:
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s1 = s1.substr(nNode->label().length());
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cNode = nNode;
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break;
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default:
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return Empty;
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}
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} else
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return Empty;
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}
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return tNode->data();
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}
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template<class Payload>
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struct GraphTraits<Trie<Payload> > {
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typedef Trie<Payload> TrieType;
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typedef typename TrieType::Node NodeType;
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typedef typename NodeType::iterator ChildIteratorType;
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static inline NodeType *getEntryNode(const TrieType& T) {
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return T.getRoot();
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}
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) { return N->end(); }
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typedef typename std::vector<NodeType*>::const_iterator nodes_iterator;
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static inline nodes_iterator nodes_begin(const TrieType& G) {
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return G.Nodes.begin();
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}
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static inline nodes_iterator nodes_end(const TrieType& G) {
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return G.Nodes.end();
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}
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};
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template<class Payload>
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struct DOTGraphTraits<Trie<Payload> > : public DefaultDOTGraphTraits {
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typedef typename Trie<Payload>::Node NodeType;
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typedef typename GraphTraits<Trie<Payload> >::ChildIteratorType EdgeIter;
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static std::string getGraphName(const Trie<Payload>& T) {
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return "Trie";
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}
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static std::string getNodeLabel(NodeType* Node, const Trie<Payload>& T) {
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if (T.getRoot() == Node)
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return "<Root>";
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else
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return Node->label();
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}
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static std::string getEdgeSourceLabel(NodeType* Node, EdgeIter I) {
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NodeType* N = *I;
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return N->label().substr(0, 1);
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}
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static std::string getNodeAttributes(const NodeType* Node,
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const Trie<Payload>& T) {
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if (Node->data() != T.Empty)
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return "color=blue";
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return "";
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}
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};
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} // end of llvm namespace
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#endif // LLVM_ADT_TRIE_H
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