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#include "csplit.h"
#include <iostream>
#include "filelib.h"
#include "stringlib.h"
#include "hg.h"
#include "tdict.h"
#include "grammar.h"
#include "sentence_metadata.h"
using namespace std;
struct CompoundSplitImpl {
CompoundSplitImpl(const boost::program_options::variables_map& conf) :
fugen_elements_(true), // TODO configure
min_size_(3),
kXCAT(TD::Convert("X")*-1),
kWORDBREAK_RULE(new TRule("[X] ||| # ||| #")),
kTEMPLATE_RULE(new TRule("[X] ||| [X,1] ? ||| [1] ?")),
kGOAL_RULE(new TRule("[Goal] ||| [X,1] ||| [1]")),
kFUGEN_S(FD::Convert("FugS")),
kFUGEN_N(FD::Convert("FugN")) {}
void PasteTogetherStrings(const vector<string>& chars,
const int i,
const int j,
string* yield) {
int size = 0;
for (int k=i; k<j; ++k)
size += chars[k].size();
yield->resize(size);
int cur = 0;
for (int k=i; k<j; ++k) {
const string& cs = chars[k];
for (int l = 0; l < cs.size(); ++l)
(*yield)[cur++] = cs[l];
}
}
void BuildTrellis(const vector<string>& chars,
Hypergraph* forest) {
vector<int> nodes(chars.size()+1, -1);
nodes[0] = forest->AddNode(kXCAT)->id_; // source
const int left_rule = forest->AddEdge(kWORDBREAK_RULE, Hypergraph::TailNodeVector())->id_;
forest->ConnectEdgeToHeadNode(left_rule, nodes[0]);
const int max_split_ = chars.size() - min_size_ + 1;
for (int i = min_size_; i < max_split_; ++i)
nodes[i] = forest->AddNode(kXCAT)->id_;
assert(nodes.back() == -1);
nodes.back() = forest->AddNode(kXCAT)->id_; // sink
for (int i = 0; i < max_split_; ++i) {
if (nodes[i] < 0) continue;
for (int j = i + min_size_; j <= chars.size(); ++j) {
if (nodes[j] < 0) continue;
string yield;
PasteTogetherStrings(chars, i, j, &yield);
// cerr << "[" << i << "," << j << "] " << yield << endl;
TRulePtr rule = TRulePtr(new TRule(*kTEMPLATE_RULE));
rule->e_[1] = rule->f_[1] = TD::Convert(yield);
// cerr << rule->AsString() << endl;
int edge = forest->AddEdge(
rule,
Hypergraph::TailNodeVector(1, nodes[i]))->id_;
forest->ConnectEdgeToHeadNode(edge, nodes[j]);
forest->edges_[edge].i_ = i;
forest->edges_[edge].j_ = j;
// handle "fugenelemente" here
// don't delete "fugenelemente" at the end of words
if (fugen_elements_ && j != chars.size()) {
const int len = yield.size();
string alt;
int fid = 0;
if (len > (min_size_ + 2) && yield[len-1] == 's' && yield[len-2] == 'e') {
alt = yield.substr(0, len - 2);
fid = kFUGEN_S;
} else if (len > (min_size_ + 1) && yield[len-1] == 's') {
alt = yield.substr(0, len - 1);
fid = kFUGEN_S;
} else if (len > (min_size_ + 2) && yield[len-2] == 'e' && yield[len-1] == 'n') {
alt = yield.substr(0, len - 1);
fid = kFUGEN_N;
}
if (alt.size()) {
TRulePtr altrule = TRulePtr(new TRule(*rule));
altrule->e_[1] = TD::Convert(alt);
// cerr << altrule->AsString() << endl;
int edge = forest->AddEdge(
altrule,
Hypergraph::TailNodeVector(1, nodes[i]))->id_;
forest->ConnectEdgeToHeadNode(edge, nodes[j]);
forest->edges_[edge].feature_values_.set_value(fid, 1.0);
forest->edges_[edge].i_ = i;
forest->edges_[edge].j_ = j;
}
}
}
}
// add goal rule
Hypergraph::TailNodeVector tail(1, forest->nodes_.size() - 1);
Hypergraph::Node* goal = forest->AddNode(TD::Convert("Goal")*-1);
Hypergraph::Edge* hg_edge = forest->AddEdge(kGOAL_RULE, tail);
forest->ConnectEdgeToHeadNode(hg_edge, goal);
}
private:
const bool fugen_elements_;
const int min_size_;
const WordID kXCAT;
const TRulePtr kWORDBREAK_RULE;
const TRulePtr kTEMPLATE_RULE;
const TRulePtr kGOAL_RULE;
const int kFUGEN_S;
const int kFUGEN_N;
};
CompoundSplit::CompoundSplit(const boost::program_options::variables_map& conf) :
pimpl_(new CompoundSplitImpl(conf)) {}
static void SplitUTF8String(const string& in, vector<string>* out) {
out->resize(in.size());
int i = 0;
int c = 0;
while (i < in.size()) {
const int len = UTF8Len(in[i]);
assert(len);
(*out)[c] = in.substr(i, len);
++c;
i += len;
}
out->resize(c);
}
bool CompoundSplit::Translate(const string& input,
SentenceMetadata* smeta,
const vector<double>& weights,
Hypergraph* forest) {
if (input.find(" ") != string::npos) {
cerr << " BAD INPUT: " << input << "\n CompoundSplit expects single words\n";
abort();
}
vector<string> in;
SplitUTF8String(input, &in);
smeta->SetSourceLength(in.size()); // TODO do utf8 or somethign
pimpl_->BuildTrellis(in, forest);
forest->Reweight(weights);
return true;
}
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