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package ict.parser.example;
import java.io.StringReader;
import java.util.Collection;
import java.util.List;
import edu.stanford.nlp.ling.CoreLabel;
import edu.stanford.nlp.ling.HasWord;
import edu.stanford.nlp.ling.Sentence;
import edu.stanford.nlp.parser.lexparser.LexicalizedParser;
import edu.stanford.nlp.process.CoreLabelTokenFactory;
import edu.stanford.nlp.process.DocumentPreprocessor;
import edu.stanford.nlp.process.PTBTokenizer;
import edu.stanford.nlp.process.Tokenizer;
import edu.stanford.nlp.process.TokenizerFactory;
import edu.stanford.nlp.trees.GrammaticalStructure;
import edu.stanford.nlp.trees.GrammaticalStructureFactory;
import edu.stanford.nlp.trees.PennTreebankLanguagePack;
import edu.stanford.nlp.trees.Tree;
import edu.stanford.nlp.trees.TreePrint;
import edu.stanford.nlp.trees.TreebankLanguagePack;
import edu.stanford.nlp.trees.TypedDependency;
class ParserDemo {
/**
* The main method demonstrates the easiest way to load a parser. Simply
* call loadModel and specify the path of a serialized grammar model, which
* can be a file, a resource on the classpath, or even a URL. For example,
* this demonstrates loading from the models jar file, which you therefore
* need to include in the classpath for ParserDemo to work.
*/
public static void main(String[] args) {
LexicalizedParser lp = LexicalizedParser
.loadModel("edu/stanford/nlp/models/lexparser/englishPCFG.ser.gz");
if (args.length > 0) {
demoDP(lp, args[0]);
} else {
demoAPI(lp);
}
}
/**
* demoDP demonstrates turning a file into tokens and then parse trees. Note
* that the trees are printed by calling pennPrint on the Tree object. It is
* also possible to pass a PrintWriter to pennPrint if you want to capture
* the output.
*
* file => tokens => parse trees
*/
public static void demoDP(LexicalizedParser lp, String filename) {
// This option shows loading, sentence-segmenting and tokenizing
// a file using DocumentPreprocessor.
TreebankLanguagePack tlp = new PennTreebankLanguagePack();
GrammaticalStructureFactory gsf = tlp.grammaticalStructureFactory();
// You could also create a tokenizer here (as below) and pass it
// to DocumentPreprocessor
for (List<HasWord> sentence : new DocumentPreprocessor(filename)) {
Tree parse = lp.apply(sentence);
parse.pennPrint();
System.out.println();
GrammaticalStructure gs = gsf.newGrammaticalStructure(parse);
Collection tdl = gs.typedDependenciesCCprocessed();
System.out.println(tdl);
System.out.println();
}
}
/**
* demoAPI demonstrates other ways of calling the parser with already
* tokenized text, or in some cases, raw text that needs to be tokenized as
* a single sentence. Output is handled with a TreePrint object. Note that
* the options used when creating the TreePrint can determine what results
* to print out. Once again, one can capture the output by passing a
* PrintWriter to TreePrint.printTree.
*
* difference: already tokenized text
*
*
*/
public static void demoAPI(LexicalizedParser lp) {
// This option shows parsing a list of correctly tokenized words
String[] sent = { "This", "is", "an", "easy", "sentence", "." };
List<CoreLabel> rawWords = Sentence.toCoreLabelList(sent);
Tree parse = lp.apply(rawWords);
parse.pennPrint();
System.out.println();
// This option shows loading and using an explicit tokenizer
String sent2 = "Hey @Apple, pretty much all your products are amazing. You blow minds every time you launch a new gizmo."
+ " that said, your hold music is crap";
TokenizerFactory<CoreLabel> tokenizerFactory = PTBTokenizer.factory(
new CoreLabelTokenFactory(), "");
Tokenizer<CoreLabel> tok = tokenizerFactory
.getTokenizer(new StringReader(sent2));
List<CoreLabel> rawWords2 = tok.tokenize();
parse = lp.apply(rawWords2);
TreebankLanguagePack tlp = new PennTreebankLanguagePack();
GrammaticalStructureFactory gsf = tlp.grammaticalStructureFactory();
GrammaticalStructure gs = gsf.newGrammaticalStructure(parse);
List<TypedDependency> tdl = gs.typedDependenciesCCprocessed();
System.out.println(tdl);
System.out.println();
// You can also use a TreePrint object to print trees and dependencies
TreePrint tp = new TreePrint("penn,typedDependenciesCollapsed");
tp.printTree(parse);
}
private ParserDemo() {
} // static methods only
}
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