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-rw-r--r--decoder/t2s_test.cc8
-rw-r--r--decoder/tree2string_translator.cc18
-rw-r--r--decoder/tree_fragment.cc12
-rw-r--r--decoder/tree_fragment.h112
4 files changed, 125 insertions, 25 deletions
diff --git a/decoder/t2s_test.cc b/decoder/t2s_test.cc
index 3c46ea89..5ebb2662 100644
--- a/decoder/t2s_test.cc
+++ b/decoder/t2s_test.cc
@@ -15,8 +15,11 @@ BOOST_AUTO_TEST_CASE(TestTreeFragments) {
vector<WordID> aw, bw;
cerr << "TREE1: " << tree << endl;
cerr << "TREE2: " << tree2 << endl;
- for (auto& sym : tree)
+ for (auto& sym : tree) {
+ if (cdec::IsLHS(sym)) cerr << "(";
+ cerr << TD::Convert(sym & cdec::ALL_MASK) << endl;
if (cdec::IsTerminal(sym)) aw.push_back(sym); else a.push_back(sym);
+ }
for (auto& sym : tree2)
if (cdec::IsTerminal(sym)) bw.push_back(sym); else b.push_back(sym);
BOOST_CHECK_EQUAL(a.size(), b.size());
@@ -38,11 +41,12 @@ BOOST_AUTO_TEST_CASE(TestTreeFragments) {
if (cdec::IsFrontier(*it)) nts += "*";
}
}
+ cerr << "Truncated: " << nts << endl;
BOOST_CHECK_EQUAL(nts, "(S NP* VP*");
nts.clear();
int ntc = 0;
- for (cdec::TreeFragment::iterator it = tree.begin(); it != tree.end(); ++it) {
+ for (auto it = tree.bfs_begin(); it != tree.bfs_end(); ++it) {
if (cdec::IsNT(*it)) {
if (cdec::IsRHS(*it)) {
++ntc;
diff --git a/decoder/tree2string_translator.cc b/decoder/tree2string_translator.cc
index 8d12d01d..3fbf1ee5 100644
--- a/decoder/tree2string_translator.cc
+++ b/decoder/tree2string_translator.cc
@@ -38,14 +38,13 @@ void ReadTree2StringGrammar(istream* in, Tree2StringGrammarNode* root) {
// but it will not generate source strings correctly
vector<int> frhs;
for (auto sym : rule_src) {
+ //cerr << TD::Convert(sym & cdec::ALL_MASK) << endl;
cur = &cur->next[sym];
- if (sym) {
- if (cdec::IsFrontier(sym)) { // frontier symbols -> variables
- int nt = (sym & cdec::ALL_MASK);
- frhs.push_back(-nt);
- } else if (cdec::IsTerminal(sym)) {
- frhs.push_back(sym);
- }
+ if (cdec::IsFrontier(sym)) { // frontier symbols -> variables
+ int nt = (sym & cdec::ALL_MASK);
+ frhs.push_back(-nt);
+ } else if (cdec::IsTerminal(sym)) {
+ frhs.push_back(sym);
}
}
os << '[' << TD::Convert(-lhs) << "] |||";
@@ -61,6 +60,7 @@ void ReadTree2StringGrammar(istream* in, Tree2StringGrammarNode* root) {
os << " ||| " << line.substr(pos);
TRulePtr rule(new TRule(os.str()));
cur->rules.push_back(rule);
+ //cerr << "RULE: " << rule->AsString() << "\n\n";
}
}
@@ -82,7 +82,7 @@ struct ParserState {
}
vector<unsigned> future_work;
int input_node_idx; // lhs of top level NT
- Tree2StringGrammarNode* node;
+ Tree2StringGrammarNode* node; // pointer into grammar
};
namespace std {
@@ -239,11 +239,13 @@ struct Tree2StringTranslatorImpl {
new_s.future_work.push_back(new_work); // if this traversal of the input succeeds, future_work goes on the q
if (unique.insert(new_s).second) q.push(new_s);
}
+ //else { cerr << "did not match [" << TD::Convert(sym & cdec::ALL_MASK) << "]\n"; }
if (nit1 != s.node->next.end()) {
//cerr << "MATCHED FULL RHS: " << TD::Convert(sym & cdec::ALL_MASK) << endl;
const ParserState new_s(++s.in_iter, &nit1->second, s);
if (unique.insert(new_s).second) q.push(new_s);
}
+ //else { cerr << "did not match " << TD::Convert(sym & cdec::ALL_MASK) << "\n"; }
} else if (cdec::IsTerminal(sym)) {
auto nit = s.node->next.find(sym);
if (nit != s.node->next.end()) {
diff --git a/decoder/tree_fragment.cc b/decoder/tree_fragment.cc
index 78a993b8..4d429f42 100644
--- a/decoder/tree_fragment.cc
+++ b/decoder/tree_fragment.cc
@@ -112,16 +112,4 @@ void TreeFragment::ParseRec(const string& tree, bool afs, unsigned cp, unsigned
*psymp = symp;
}
-BreadthFirstIterator TreeFragment::begin() const {
- return BreadthFirstIterator(this, nodes.size() - 1);
-}
-
-BreadthFirstIterator TreeFragment::begin(unsigned node_idx) const {
- return BreadthFirstIterator(this, node_idx);
-}
-
-BreadthFirstIterator TreeFragment::end() const {
- return BreadthFirstIterator(this);
-}
-
}
diff --git a/decoder/tree_fragment.h b/decoder/tree_fragment.h
index f1c4c106..4a704bc4 100644
--- a/decoder/tree_fragment.h
+++ b/decoder/tree_fragment.h
@@ -11,6 +11,7 @@
namespace cdec {
class BreadthFirstIterator;
+class DepthFirstIterator;
static const unsigned LHS_BIT = 0x10000000u;
static const unsigned RHS_BIT = 0x20000000u;
@@ -53,16 +54,21 @@ class TreeFragment {
// (S (NP a (X b) c d) (VP (V foo) (NP (NN bar))))
explicit TreeFragment(const std::string& tree, bool allow_frontier_sites = false);
void DebugRec(unsigned cur, std::ostream* out) const;
- typedef BreadthFirstIterator iterator;
+ typedef DepthFirstIterator iterator;
typedef ptrdiff_t difference_type;
typedef unsigned value_type;
typedef const unsigned * pointer;
typedef const unsigned & reference;
+ // default iterator is DFS
iterator begin() const;
iterator begin(unsigned node_idx) const;
iterator end() const;
+ BreadthFirstIterator bfs_begin() const;
+ BreadthFirstIterator bfs_begin(unsigned node_idx) const;
+ BreadthFirstIterator bfs_end() const;
+
private:
// cp is the character index in the tree
// np keeps track of the nodes (nonterminals) that have been built
@@ -78,14 +84,106 @@ class TreeFragment {
struct TFIState {
TFIState() : node(), rhspos(), state() {}
- TFIState(unsigned n, unsigned p, unsigned s) : node(n), rhspos(p), state(s) {}
+ TFIState(unsigned n, int p, unsigned s) : node(n), rhspos(p), state(s) {}
bool operator==(const TFIState& o) const { return node == o.node && rhspos == o.rhspos && state == o.state; }
bool operator!=(const TFIState& o) const { return node != o.node || rhspos != o.rhspos || state != o.state; }
unsigned short node;
- unsigned short rhspos;
+ short rhspos;
unsigned char state;
};
+class DepthFirstIterator : public std::iterator<std::forward_iterator_tag, unsigned> {
+ const TreeFragment* tf_;
+ std::deque<TFIState> q_;
+ unsigned sym;
+ public:
+ DepthFirstIterator() : tf_(), sym() {}
+ // used for begin
+ explicit DepthFirstIterator(const TreeFragment* tf, unsigned node_idx) : tf_(tf) {
+ q_.push_back(TFIState(node_idx, -1, 0));
+ Stage();
+ q_.back().state++;
+ }
+ // used for end
+ explicit DepthFirstIterator(const TreeFragment* tf) : tf_(tf) {}
+ const unsigned& operator*() const { return sym; }
+ const unsigned* operator->() const { return &sym; }
+ bool operator==(const DepthFirstIterator& other) const {
+ return (tf_ == other.tf_) && (q_ == other.q_);
+ }
+ bool operator!=(const DepthFirstIterator& other) const {
+ return (tf_ != other.tf_) || (q_ != other.q_);
+ }
+ unsigned node_idx() const { return q_.front().node; }
+ const DepthFirstIterator& operator++() {
+ TFIState& s = q_.back();
+ if (s.state == 0) {
+ Stage();
+ s.state++;
+ } else if (s.state == 1) {
+ const unsigned len = tf_->nodes[s.node].rhs.size();
+ s.rhspos++;
+ if (s.rhspos >= len) {
+ q_.pop_back();
+ while (!q_.empty()) {
+ TFIState& s = q_.back();
+ const unsigned len = tf_->nodes[s.node].rhs.size();
+ s.rhspos++;
+ if (s.rhspos < len) break;
+ q_.pop_back();
+ }
+ }
+ Stage();
+ }
+ return *this;
+ }
+ DepthFirstIterator operator++(int) {
+ DepthFirstIterator res = *this;
+ ++(*this);
+ return res;
+ }
+ // tell iterator not to explore the subtree rooted at sym
+ // should only be called once per NT symbol encountered
+ const DepthFirstIterator& truncate() {
+ assert(IsRHS(sym));
+ sym &= ALL_MASK;
+ sym |= FRONTIER_BIT;
+ q_.pop_back();
+ return *this;
+ }
+ unsigned child_node() const {
+ assert(IsRHS(sym));
+ return q_.back().node;
+ }
+ DepthFirstIterator remainder() const {
+ assert(IsRHS(sym));
+ return DepthFirstIterator(tf_, q_.back());
+ }
+ bool at_end() const {
+ return q_.empty();
+ }
+ private:
+ void Stage() {
+ if (q_.empty()) return;
+ const TFIState& s = q_.back();
+ if (s.state == 0) {
+ sym = (tf_->nodes[s.node].lhs & ALL_MASK) | LHS_BIT;
+ } else if (s.state == 1) {
+ sym = tf_->nodes[s.node].rhs[s.rhspos];
+ if (IsRHS(sym)) {
+ q_.push_back(TFIState(sym & ALL_MASK, -1, 0));
+ sym = tf_->nodes[sym & ALL_MASK].lhs | RHS_BIT;
+ }
+ }
+ }
+
+ // used by remainder
+ DepthFirstIterator(const TreeFragment* tf, const TFIState& s) : tf_(tf) {
+ q_.push_back(s);
+ Stage();
+ }
+};
+
class BreadthFirstIterator : public std::iterator<std::forward_iterator_tag, unsigned> {
const TreeFragment* tf_;
std::deque<TFIState> q_;
@@ -172,6 +270,14 @@ class BreadthFirstIterator : public std::iterator<std::forward_iterator_tag, uns
}
};
+inline TreeFragment::iterator TreeFragment::begin() const { return iterator(this, nodes.size() - 1); }
+inline TreeFragment::iterator TreeFragment::begin(unsigned node_idx) const { return iterator(this, node_idx); }
+inline TreeFragment::iterator TreeFragment::end() const { return iterator(this); }
+
+inline BreadthFirstIterator TreeFragment::bfs_begin() const { return BreadthFirstIterator(this, nodes.size() - 1); }
+inline BreadthFirstIterator TreeFragment::bfs_begin(unsigned node_idx) const { return BreadthFirstIterator(this, node_idx); }
+inline BreadthFirstIterator TreeFragment::bfs_end() const { return BreadthFirstIterator(this); }
+
inline std::ostream& operator<<(std::ostream& os, const TreeFragment& x) {
x.DebugRec(x.nodes.size() - 1, &os);
return os;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 06:03:41 +0000