mirror of
https://github.com/moses-smt/mosesdecoder.git
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364 lines
12 KiB
C++
364 lines
12 KiB
C++
// $Id$
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#include "TreeInput.h"
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#include "StaticData.h"
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#include "Util.h"
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#include "XmlOption.h"
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#include "FactorCollection.h"
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#include "moses/TranslationModel/PhraseDictionary.h"
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using namespace std;
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namespace Moses
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{
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/**
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* Process a sentence with xml annotation
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* Xml tags may specifiy additional/replacing translation options
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* and reordering constraints
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*
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* \param line in: sentence, out: sentence without the xml
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* \param res vector with translation options specified by xml
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* \param reorderingConstraint reordering constraint zones specified by xml
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* \param walls reordering constraint walls specified by xml
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*/
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bool
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TreeInput::
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ProcessAndStripXMLTags(AllOptions const& opts, string &line,
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std::vector<XMLParseOutput> &sourceLabels,
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std::vector<XmlOption const*> &xmlOptions)
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{
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//parse XML markup in translation line
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vector<FactorType> const& oFactors = opts.output.factor_order;
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// no xml tag? we're done.
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if (line.find_first_of('<') == string::npos) {
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return true;
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}
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// hack. What pt should XML trans opt be assigned to?
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PhraseDictionary *firstPt = NULL;
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if (PhraseDictionary::GetColl().size() == 0) {
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firstPt = PhraseDictionary::GetColl()[0];
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}
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// break up input into a vector of xml tags and text
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// example: (this), (<b>), (is a), (</b>), (test .)
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vector<string> xmlTokens = TokenizeXml(line);
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// we need to store opened tags, until they are closed
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// tags are stored as tripled (tagname, startpos, contents)
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typedef pair< string, pair< size_t, string > > OpenedTag;
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vector< OpenedTag > tagStack; // stack that contains active opened tags
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string cleanLine; // return string (text without xml)
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size_t wordPos = 0; // position in sentence (in terms of number of words)
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// loop through the tokens
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for (size_t xmlTokenPos = 0 ; xmlTokenPos < xmlTokens.size() ; xmlTokenPos++) {
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// not a xml tag, but regular text (may contain many words)
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if(!isXmlTag(xmlTokens[xmlTokenPos])) {
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// add a space at boundary, if necessary
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if (cleanLine.size()>0 &&
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cleanLine[cleanLine.size() - 1] != ' ' &&
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xmlTokens[xmlTokenPos][0] != ' ') {
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cleanLine += " ";
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}
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cleanLine += xmlTokens[xmlTokenPos]; // add to output
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wordPos = Tokenize(cleanLine).size(); // count all the words
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}
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// process xml tag
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else {
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// *** get essential information about tag ***
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// strip extra boundary spaces and "<" and ">"
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string tag = Trim(TrimXml(xmlTokens[xmlTokenPos]));
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VERBOSE(3,"XML TAG IS: " << tag << std::endl);
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if (tag.size() == 0) {
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TRACE_ERR("ERROR: empty tag name: " << line << endl);
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return false;
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}
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// check if unary (e.g., "<wall/>")
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bool isUnary = ( tag[tag.size() - 1] == '/' );
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// check if opening tag (e.g. "<a>", not "</a>")g
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bool isClosed = ( tag[0] == '/' );
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bool isOpen = !isClosed;
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if (isClosed && isUnary) {
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TRACE_ERR("ERROR: can't have both closed and unary tag <" << tag << ">: " << line << endl);
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return false;
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}
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if (isClosed)
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tag = tag.substr(1); // remove "/" at the beginning
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if (isUnary)
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tag = tag.substr(0,tag.size()-1); // remove "/" at the end
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// find the tag name and contents
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string::size_type endOfName = tag.find_first_of(' ');
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string tagName = tag;
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string tagContent = "";
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if (endOfName != string::npos) {
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tagName = tag.substr(0,endOfName);
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tagContent = tag.substr(endOfName+1);
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}
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// *** process new tag ***
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if (isOpen || isUnary) {
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// put the tag on the tag stack
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OpenedTag openedTag = make_pair( tagName, make_pair( wordPos, tagContent ) );
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tagStack.push_back( openedTag );
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VERBOSE(3,"XML TAG " << tagName << " (" << tagContent << ") added to stack, now size " << tagStack.size() << endl);
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}
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// *** process completed tag ***
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if (isClosed || isUnary) {
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// pop last opened tag from stack;
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if (tagStack.size() == 0) {
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TRACE_ERR("ERROR: tag " << tagName << " closed, but not opened" << ":" << line << endl);
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return false;
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}
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OpenedTag openedTag = tagStack.back();
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tagStack.pop_back();
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// tag names have to match
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if (openedTag.first != tagName) {
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TRACE_ERR("ERROR: tag " << openedTag.first << " closed by tag " << tagName << ": " << line << endl );
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return false;
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}
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// assemble remaining information about tag
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size_t startPos = openedTag.second.first;
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string tagContent = openedTag.second.second;
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size_t endPos = wordPos;
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// span attribute overwrites position
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string span = ParseXmlTagAttribute(tagContent,"span");
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if (! span.empty()) {
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vector<string> ij = Tokenize(span, "-");
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if (ij.size() != 1 && ij.size() != 2) {
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TRACE_ERR("ERROR: span attribute must be of the form \"i-j\" or \"i\": " << line << endl);
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return false;
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}
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startPos = atoi(ij[0].c_str());
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if (ij.size() == 1) endPos = startPos + 1;
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else endPos = atoi(ij[1].c_str()) + 1;
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}
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VERBOSE(3,"XML TAG " << tagName << " (" << tagContent << ") spanning " << startPos << " to " << (endPos-1) << " complete, commence processing" << endl);
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if (startPos == endPos) {
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TRACE_ERR("WARNING: tag " << tagName << " span is empty. Ignoring: " << line << endl);
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continue;
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} else if (startPos > endPos) {
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TRACE_ERR("ERROR: tag " << tagName << " startPos > endPos: " << line << endl);
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return false;
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}
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// may be either a input span label ("label"), or a specified output translation "translation"
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string label = ParseXmlTagAttribute(tagContent,"label");
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string translation = ParseXmlTagAttribute(tagContent,"translation");
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// specified label
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if (translation.length() == 0 && label.length() > 0) {
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Range range(startPos,endPos-1); // really?
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XMLParseOutput item(label, range);
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sourceLabels.push_back(item);
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}
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// specified translations -> vector of phrases, separated by "||"
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if (translation.length() > 0 && opts.input.xml_policy != XmlIgnore) {
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vector<string> altTexts = TokenizeMultiCharSeparator(translation, "||");
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vector<string> altLabel = TokenizeMultiCharSeparator(label, "||");
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vector<string> altProbs = TokenizeMultiCharSeparator(ParseXmlTagAttribute(tagContent,"prob"), "||");
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//TRACE_ERR("number of translations: " << altTexts.size() << endl);
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for (size_t i=0; i<altTexts.size(); ++i) {
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// set target phrase
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TargetPhrase targetPhrase(firstPt);
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targetPhrase.CreateFromString(Output, oFactors, altTexts[i], NULL);
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// set constituent label
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string targetLHSstr;
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if (altLabel.size() > i && altLabel[i].size() > 0) {
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targetLHSstr = altLabel[i];
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} else {
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const UnknownLHSList &lhsList = StaticData::Instance().GetUnknownLHS();
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UnknownLHSList::const_iterator iterLHS = lhsList.begin();
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targetLHSstr = iterLHS->first;
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}
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Word *targetLHS = new Word(true);
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targetLHS->CreateFromString(Output, oFactors, targetLHSstr, true);
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UTIL_THROW_IF2(targetLHS->GetFactor(0) == NULL,
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"Null factor left-hand-side");
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targetPhrase.SetTargetLHS(targetLHS);
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// not tested
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Phrase sourcePhrase = this->GetSubString(Range(startPos,endPos-1));
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// get probability
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float probValue = 1;
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if (altProbs.size() > i && altProbs[i].size() > 0) {
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probValue = Scan<float>(altProbs[i]);
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}
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// convert from prob to log-prob
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float scoreValue = FloorScore(TransformScore(probValue));
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targetPhrase.SetXMLScore(scoreValue);
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targetPhrase.EvaluateInIsolation(sourcePhrase);
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// set span and create XmlOption
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Range range(startPos+1,endPos);
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XmlOption *option = new XmlOption(range,targetPhrase);
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assert(option);
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xmlOptions.push_back(option);
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VERBOSE(2,"xml translation = [" << range << "] " << targetLHSstr << " -> " << altTexts[i] << " prob: " << probValue << endl);
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}
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altTexts.clear();
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altProbs.clear();
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}
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}
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}
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}
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// we are done. check if there are tags that are still open
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if (tagStack.size() > 0) {
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TRACE_ERR("ERROR: some opened tags were never closed: " << line << endl);
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return false;
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}
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// return de-xml'ed sentence in line
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line = cleanLine;
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return true;
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}
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//! populate this InputType with data from in stream
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int
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TreeInput::
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Read(std::istream& in)
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{
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string line;
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if (getline(in, line, '\n').eof())
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return 0;
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m_labelledSpans.clear();
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ProcessAndStripXMLTags(*m_options, line, m_labelledSpans, m_xmlOptions);
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// do words 1st - hack
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stringstream strme;
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strme << line << endl;
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Sentence::Read(strme);
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// size input chart
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size_t sourceSize = GetSize();
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m_sourceChart.resize(sourceSize);
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for (size_t pos = 0; pos < sourceSize; ++pos) {
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m_sourceChart[pos].resize(sourceSize - pos);
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}
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// do source labels
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vector<XMLParseOutput>::const_iterator iterLabel;
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for (iterLabel = m_labelledSpans.begin();
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iterLabel != m_labelledSpans.end(); ++iterLabel) {
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const XMLParseOutput &labelItem = *iterLabel;
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const Range &range = labelItem.m_range;
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const string &label = labelItem.m_label;
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AddChartLabel(range.GetStartPos() + 1, range.GetEndPos() + 1, label);
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}
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// default label
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bool only4empty = m_options->syntax.default_non_term_only_for_empty_range;
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for (size_t startPos = 0; startPos < sourceSize; ++startPos) {
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for (size_t endPos = startPos; endPos < sourceSize; ++endPos) {
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NonTerminalSet &list = GetLabelSet(startPos, endPos);
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if (list.size() == 0 || ! only4empty ) {
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AddChartLabel(startPos, endPos, m_options->syntax.input_default_non_terminal);
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}
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}
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}
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return 1;
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}
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//! Output debugging info to stream out
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void TreeInput::Print(std::ostream &out) const
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{
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out << *this << "\n";
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}
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//! create trans options specific to this InputType
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TranslationOptionCollection* TreeInput::CreateTranslationOptionCollection() const
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{
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return NULL;
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}
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void
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TreeInput::
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AddChartLabel(size_t startPos, size_t endPos, const Word &label)
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{
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UTIL_THROW_IF2(!label.IsNonTerminal(),
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"Label must be a non-terminal");
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SourceLabelOverlap overlapType = m_options->syntax.source_label_overlap;
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NonTerminalSet &list = GetLabelSet(startPos, endPos);
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switch (overlapType) {
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case SourceLabelOverlapAdd:
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list.insert(label);
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break;
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case SourceLabelOverlapReplace:
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if (list.size() > 0) // replace existing label
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list.clear();
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list.insert(label);
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break;
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case SourceLabelOverlapDiscard:
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if (list.size() == 0)
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list.insert(label);
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break;
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}
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}
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void
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TreeInput::
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AddChartLabel(size_t startPos, size_t endPos, const string &label)
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{
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const std::vector<FactorType>& fOrder = m_options->input.factor_order;
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Word word(true);
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const Factor *factor
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= FactorCollection::Instance().AddFactor(Input, fOrder[0], label, true);
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// TODO - no factors
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word.SetFactor(0, factor);
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AddChartLabel(startPos, endPos, word);
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}
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std::ostream& operator<<(std::ostream &out, const TreeInput &input)
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{
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out<< static_cast<Phrase const&>(input) << " ||| ";
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size_t size = input.GetSize();
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for (size_t startPos = 0; startPos < size; ++startPos) {
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for (size_t endPos = startPos; endPos < size; ++endPos) {
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const NonTerminalSet &labelSet = input.GetLabelSet(startPos, endPos);
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NonTerminalSet::const_iterator iter;
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for (iter = labelSet.begin(); iter != labelSet.end(); ++iter) {
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const Word &word = *iter;
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UTIL_THROW_IF2(!word.IsNonTerminal(),
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"Word must be a non-terminal");
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out << "[" << startPos <<"," << endPos << "]="
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<< word << "(" << word.IsNonTerminal() << ") ";
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}
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}
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}
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return out;
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}
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} // namespace
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