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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package opennlp.tools.parser;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.Stack;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import opennlp.tools.util.Span;
/**
* Data structure for holding parse constituents.
*/
public class Parse implements Cloneable, Comparable {
public static final String BRACKET_LRB = "(";
public static final String BRACKET_RRB = ")";
public static final String BRACKET_LCB = "{";
public static final String BRACKET_RCB = "}";
public static final String BRACKET_LSB = "[";
public static final String BRACKET_RSB = "]";
/**
* The text string on which this parse is based.
* This object is shared among all parses for the same sentence.
*/
private String text;
/**
* The character offsets into the text for this constituent.
*/
private Span span;
/**
* The syntactic type of this parse.
*/
private String type;
/**
* The sub-constituents of this parse.
*/
private List parts;
/**
* The head parse of this parse. A parse can be its own head.
*/
private Parse head;
/**
* A string used during parse construction to specify which
* stage of parsing has been performed on this node.
*/
private String label;
/**
* Index in the sentence of the head of this constituent.
*/
private int headIndex;
/**
* The parent parse of this parse.
*/
private Parse parent;
/**
* The probability associated with the syntactic type
* assigned to this parse.
*/
private double prob;
/**
* The string buffer used to track the derivation of this parse.
*/
private StringBuffer derivation;
/**
* Specifies whether this constituent was built during the chunking phase.
*/
private boolean isChunk;
/**
* The pattern used to find the base constituent label of a
* Penn Treebank labeled constituent.
*/
private static Pattern typePattern = Pattern.compile("^([^ =-]+)");
/**
* The pattern used to find the function tags.
*/
private static Pattern funTypePattern = Pattern.compile("^[^ =-]+-([^ =-]+)");
/**
* The patter used to identify tokens in Penn Treebank labeled constituents.
*/
private static Pattern tokenPattern = Pattern.compile("^[^ ()]+ ([^ ()]+)\\s*\\)");
/**
* The set of punctuation parses which are between this parse and the previous parse.
*/
private Collection prevPunctSet;
/**
* The set of punctuation parses which are between this parse and
* the subsequent parse.
*/
private Collection nextPunctSet;
/**
* Specifies whether constituent labels should include parts specified
* after minus character.
*/
private static boolean useFunctionTags;
/**
* Creates a new parse node for this specified text and span of the specified type
* with the specified probability and the specified head index.
*
* @param text The text of the sentence for which this node is a part of.
* @param span The character offsets for this node within the specified text.
* @param type The constituent label of this node.
* @param p The probability of this parse.
* @param index The token index of the head of this parse.
*/
public Parse(String text, Span span, String type, double p, int index) {
this.text = text;
this.span = span;
this.type = type;
this.prob = p;
this.head = this;
this.headIndex = index;
this.parts = new LinkedList<>();
this.label = null;
this.parent = null;
}
/**
* Creates a new parse node for this specified text and span of the specified type with
* the specified probability and the specified head and head index.
*
* @param text The text of the sentence for which this node is a part of.
* @param span The character offsets for this node within the specified text.
* @param type The constituent label of this node.
* @param p The probability of this parse.
* @param h The head token of this parse.
*/
public Parse(String text, Span span, String type, double p, Parse h) {
this(text, span, type, p, 0);
if (h != null) {
this.head = h;
this.headIndex = h.headIndex;
}
}
@Override
public Object clone() {
Parse p = new Parse(this.text, this.span, this.type, this.prob, this.head);
p.parts = new LinkedList<>();
p.parts.addAll(this.parts);
if (derivation != null) {
p.derivation = new StringBuffer(100);
p.derivation.append(this.derivation.toString());
}
p.label = this.label;
return (p);
}
/**
* Clones the right frontier of parse up to the specified node.
*
* @param node The last node in the right frontier of the parse tree which should be cloned.
* @return A clone of this parse and its right frontier up to and including the specified node.
*/
public Parse clone(Parse node) {
if (this == node) {
return (Parse) this.clone();
}
else {
Parse c = (Parse) this.clone();
Parse lc = c.parts.get(parts.size() - 1);
c.parts.set(parts.size() - 1,lc.clone(node));
return c;
}
}
/**
* Clones the right frontier of this root parse up to and including the specified node.
*
* @param node The last node in the right frontier of the parse tree which should be cloned.
* @param parseIndex The child index of the parse for this root node.
* @return A clone of this root parse and its right frontier up to and including the specified node.
*/
public Parse cloneRoot(Parse node, int parseIndex) {
Parse c = (Parse) this.clone();
Parse fc = c.parts.get(parseIndex);
c.parts.set(parseIndex,fc.clone(node));
return c;
}
/**
* Specifies whether function tags should be included as part of the constituent type.
*
* @param uft true is they should be included; false otherwise.
*/
public static void useFunctionTags(boolean uft) {
useFunctionTags = uft;
}
/**
* Set the type of this constituent to the specified type.
*
* @param type The type of this constituent.
*/
public void setType(String type) {
this.type = type;
}
/**
* Returns the constituent label for this node of the parse.
*
* @return The constituent label for this node of the parse.
*/
public String getType() {
return type;
}
/**
* Returns the set of punctuation parses that occur immediately before this parse.
*
* @return the set of punctuation parses that occur immediately before this parse.
*/
public Collection getPreviousPunctuationSet() {
return prevPunctSet;
}
/**
* Designates that the specified punctuation should is prior to this parse.
*
* @param punct The punctuation.
*/
public void addPreviousPunctuation(Parse punct) {
if (this.prevPunctSet == null) {
this.prevPunctSet = new TreeSet<>();
}
prevPunctSet.add(punct);
}
/**
* Returns the set of punctuation parses that occur immediately after this parse.
*
* @return the set of punctuation parses that occur immediately after this parse.
*/
public Collection getNextPunctuationSet() {
return nextPunctSet;
}
/**
* Designates that the specified punctuation follows this parse.
*
* @param punct The punctuation set.
*/
public void addNextPunctuation(Parse punct) {
if (this.nextPunctSet == null) {
this.nextPunctSet = new TreeSet<>();
}
nextPunctSet.add(punct);
}
/**
* Sets the set of punctuation tags which follow this parse.
*
* @param punctSet The set of punctuation tags which follow this parse.
*/
public void setNextPunctuation(Collection punctSet) {
this.nextPunctSet = punctSet;
}
/**
* Sets the set of punctuation tags which preceed this parse.
*
* @param punctSet The set of punctuation tags which preceed this parse.
*/
public void setPrevPunctuation(Collection punctSet) {
this.prevPunctSet = punctSet;
}
/**
* Inserts the specified constituent into this parse based on its text span.This
* method assumes that the specified constituent can be inserted into this parse.
*
* @param constituent The constituent to be inserted.
*/
public void insert(final Parse constituent) {
Span ic = constituent.span;
if (span.contains(ic)) {
//double oprob=c.prob;
int pi = 0;
int pn = parts.size();
for (; pi < pn; pi++) {
Parse subPart = parts.get(pi);
//System.err.println("Parse.insert:con="+constituent+" sp["+pi+"] "+subPart+" "+subPart.getType());
Span sp = subPart.span;
if (sp.getStart() >= ic.getEnd()) {
break;
}
// constituent contains subPart
else if (ic.contains(sp)) {
//System.err.println("Parse.insert:con contains subPart");
parts.remove(pi);
pi--;
constituent.parts.add(subPart);
subPart.setParent(constituent);
//System.err.println("Parse.insert: "+subPart.hashCode()+" -> "+subPart.getParent().hashCode());
pn = parts.size();
}
else if (sp.contains(ic)) {
//System.err.println("Parse.insert:subPart contains con");
subPart.insert(constituent);
return;
}
}
//System.err.println("Parse.insert:adding con="+constituent+" to "+this);
parts.add(pi, constituent);
constituent.setParent(this);
// System.err.println("Parse.insert: "+constituent.hashCode()+" -> "
// +constituent.getParent().hashCode());
}
else {
throw new IllegalArgumentException("Inserting constituent not contained in the sentence!");
}
}
/**
* Appends the specified string buffer with a string representation of this parse.
*
* @param sb A string buffer into which the parse string can be appended.
*/
public void show(StringBuffer sb) {
int start;
start = span.getStart();
if (!type.equals(AbstractBottomUpParser.TOK_NODE)) {
sb.append("(");
sb.append(type).append(" ");
//System.out.print(label+" ");
//System.out.print(head+" ");
//System.out.print(df.format(prob)+" ");
}
for (Iterator i = parts.iterator(); i.hasNext();) {
Parse c = i.next();
Span s = c.span;
if (start < s.getStart()) {
//System.out.println("pre "+start+" "+s.getStart());
sb.append(encodeToken(text.substring(start, s.getStart())));
}
c.show(sb);
start = s.getEnd();
}
if (start < span.getEnd()) {
sb.append(encodeToken(text.substring(start, span.getEnd())));
}
if (!type.equals(AbstractBottomUpParser.TOK_NODE)) {
sb.append(")");
}
}
/**
* Displays this parse using Penn Treebank-style formatting.
*/
public void show() {
StringBuffer sb = new StringBuffer(text.length() * 4);
show(sb);
System.out.println(sb);
}
/**
* Returns the probability associated with the pos-tag sequence assigned to this parse.
*
* @return The probability associated with the pos-tag sequence assigned to this parse.
*/
public double getTagSequenceProb() {
//System.err.println("Parse.getTagSequenceProb: "+type+" "+this);
if (parts.size() == 1 && (parts.get(0)).type.equals(AbstractBottomUpParser.TOK_NODE)) {
//System.err.println(this+" "+prob);
return (Math.log(prob));
}
else if (parts.size() == 0) {
System.err.println("Parse.getTagSequenceProb: Wrong base case!");
return (0.0);
}
else {
double sum = 0.0;
for (Iterator pi = parts.iterator(); pi.hasNext();) {
sum += pi.next().getTagSequenceProb();
}
return sum;
}
}
/**
* Returns whether this parse is complete.
*
* @return Returns true if the parse contains a single top-most node.
*/
public boolean complete() {
return (parts.size() == 1);
}
public String getCoveredText() {
return text.substring(span.getStart(), span.getEnd());
}
/**
* Represents this parse in a human readable way.
*/
@Override
public String toString() {
// TODO: Use the commented code in next bigger release,
// change probably breaks backward compatibility in some
// applications
//StringBuffer buffer = new StringBuffer();
//show(buffer);
//return buffer.toString();
return getCoveredText();
}
/**
* Returns the text of the sentence over which this parse was formed.
*
* @return The text of the sentence over which this parse was formed.
*/
public String getText() {
return text;
}
/**
* Returns the character offsets for this constituent.
*
* @return The character offsets for this constituent.
*/
public Span getSpan() {
return span;
}
/**
* Returns the log of the product of the probability associated with all the
* decisions which formed this constituent.
*
* @return The log of the product of the probability associated with all the
* decisions which formed this constituent.
*/
public double getProb() {
return prob;
}
/**
* Adds the specified probability log to this current log for this parse.
*
* @param logProb The probability of an action performed on this parse.
*/
public void addProb(double logProb) {
this.prob += logProb;
}
/**
* Returns the child constituents of this constituent
* .
* @return The child constituents of this constituent.
*/
public Parse[] getChildren() {
return parts.toArray(new Parse[parts.size()]);
}
/**
* Replaces the child at the specified index with a new child with the specified label.
*
* @param index The index of the child to be replaced.
* @param label The label to be assigned to the new child.
*/
public void setChild(int index, String label) {
Parse newChild = (Parse) (parts.get(index)).clone();
newChild.setLabel(label);
parts.set(index,newChild);
}
public void add(Parse daughter, HeadRules rules) {
if (daughter.prevPunctSet != null) {
parts.addAll(daughter.prevPunctSet);
}
parts.add(daughter);
this.span = new Span(span.getStart(),daughter.getSpan().getEnd());
this.head = rules.getHead(getChildren(),type);
this.headIndex = head.headIndex;
}
public void remove(int index) {
parts.remove(index);
if (! parts.isEmpty()) {
if (index == 0 || index == parts.size()) { //size is orig last element
span = new Span((parts.get(0)).span.getStart(),(parts.get(parts.size() - 1)).span.getEnd());
}
}
}
public Parse adjoinRoot(Parse node, HeadRules rules, int parseIndex) {
Parse lastChild = parts.get(parseIndex);
Parse adjNode = new Parse(this.text,new Span(lastChild.getSpan().getStart(),
node.getSpan().getEnd()),lastChild.getType(),1,
rules.getHead(new Parse[]{lastChild,node},lastChild.getType()));
adjNode.parts.add(lastChild);
if (node.prevPunctSet != null) {
adjNode.parts.addAll(node.prevPunctSet);
}
adjNode.parts.add(node);
parts.set(parseIndex,adjNode);
return adjNode;
}
/**
* Sister adjoins this node's last child and the specified sister node and returns their
* new parent node. The new parent node replace this nodes last child.
*
* @param sister The node to be adjoined.
* @param rules The head rules for the parser.
* @return The new parent node of this node and the specified sister node.
*/
public Parse adjoin(Parse sister, HeadRules rules) {
Parse lastChild = parts.get(parts.size() - 1);
Parse adjNode = new Parse(this.text,new Span(lastChild.getSpan().getStart(),sister.getSpan().getEnd()),
lastChild.getType(),1,rules.getHead(new Parse[]{lastChild,sister},lastChild.getType()));
adjNode.parts.add(lastChild);
if (sister.prevPunctSet != null) {
adjNode.parts.addAll(sister.prevPunctSet);
}
adjNode.parts.add(sister);
parts.set(parts.size() - 1, adjNode);
this.span = new Span(span.getStart(),sister.getSpan().getEnd());
this.head = rules.getHead(getChildren(),type);
this.headIndex = head.headIndex;
return adjNode;
}
public void expandTopNode(Parse root) {
boolean beforeRoot = true;
//System.err.println("expandTopNode: parts="+parts);
for (int pi = 0, ai = 0; pi < parts.size(); pi++,ai++) {
Parse node = parts.get(pi);
if (node == root) {
beforeRoot = false;
}
else if (beforeRoot) {
root.parts.add(ai,node);
parts.remove(pi);
pi--;
}
else {
root.parts.add(node);
parts.remove(pi);
pi--;
}
}
root.updateSpan();
}
/**
* Returns the number of children for this parse node.
*
* @return the number of children for this parse node.
*/
public int getChildCount() {
return parts.size();
}
/**
* Returns the index of this specified child.
*
* @param child A child of this parse.
*
* @return the index of this specified child or -1 if the specified child is not a child of this parse.
*/
public int indexOf(Parse child) {
return parts.indexOf(child);
}
/**
* Returns the head constituent associated with this constituent.
*
* @return The head constituent associated with this constituent.
*/
public Parse getHead() {
return head;
}
/**
* Returns the index within a sentence of the head token for this parse.
*
* @return The index within a sentence of the head token for this parse.
*/
public int getHeadIndex() {
return headIndex;
}
/**
* Returns the label assigned to this parse node during parsing
* which specifies how this node will be formed into a constituent.
*
* @return The outcome label assigned to this node during parsing.
*/
public String getLabel() {
return label;
}
/**
* Assigns this parse the specified label. This is used by parsing schemes to
* tag parsing nodes while building.
*
* @param label A label indicating something about the stage of building for this parse node.
*/
public void setLabel(String label) {
this.label = label;
}
private static String getType(String rest) {
if (rest.startsWith("-LCB-")) {
return "-LCB-";
}
else if (rest.startsWith("-RCB-")) {
return "-RCB-";
}
else if (rest.startsWith("-LRB-")) {
return "-LRB-";
}
else if (rest.startsWith("-RRB-")) {
return "-RRB-";
}
else if (rest.startsWith("-RSB-")) {
return "-RSB-";
}
else if (rest.startsWith("-LSB-")) {
return "-LSB-";
}
else if (rest.startsWith("-NONE-")) {
return "-NONE-";
}
else {
Matcher typeMatcher = typePattern.matcher(rest);
if (typeMatcher.find()) {
String type = typeMatcher.group(1);
if (useFunctionTags) {
Matcher funMatcher = funTypePattern.matcher(rest);
if (funMatcher.find()) {
String ftag = funMatcher.group(1);
type = type + "-" + ftag;
}
}
return type;
}
}
return null;
}
private static String encodeToken(String token) {
if (BRACKET_LRB.equals(token)) {
return "-LRB-";
}
else if (BRACKET_RRB.equals(token)) {
return "-RRB-";
}
else if (BRACKET_LCB.equals(token)) {
return "-LCB-";
}
else if (BRACKET_RCB.equals(token)) {
return "-RCB-";
}
else if (BRACKET_LSB.equals(token)) {
return "-LSB-";
}
else if (BRACKET_RSB.equals(token)) {
return "-RSB-";
}
return token;
}
private static String decodeToken(String token) {
if ("-LRB-".equals(token)) {
return BRACKET_LRB;
}
else if ("-RRB-".equals(token)) {
return BRACKET_RRB;
}
else if ("-LCB-".equals(token)) {
return BRACKET_LCB;
}
else if ("-RCB-".equals(token)) {
return BRACKET_RCB;
}
else if ("-LSB-".equals(token)) {
return BRACKET_LSB;
}
else if ("-RSB-".equals(token)) {
return BRACKET_RSB;
}
return token;
}
/**
* Returns the string containing the token for the specified portion of the parse string or
* null if the portion of the parse string does not represent a token.
*
* @param rest The portion of the parse string remaining to be processed.
*
* @return The string containing the token for the specified portion of the parse string or
* null if the portion of the parse string does not represent a token.
*/
private static String getToken(String rest) {
Matcher tokenMatcher = tokenPattern.matcher(rest);
if (tokenMatcher.find()) {
return decodeToken(tokenMatcher.group(1));
}
return null;
}
/**
* Computes the head parses for this parse and its sub-parses and stores this information
* in the parse data structure.
*
* @param rules The head rules which determine how the head of the parse is computed.
*/
public void updateHeads(HeadRules rules) {
if (parts != null && parts.size() != 0) {
for (int pi = 0, pn = parts.size(); pi < pn; pi++) {
Parse c = parts.get(pi);
c.updateHeads(rules);
}
this.head = rules.getHead(parts.toArray(new Parse[parts.size()]), type);
if (head == null) {
head = this;
}
else {
this.headIndex = head.headIndex;
}
}
else {
this.head = this;
}
}
public void updateSpan() {
span = new Span((parts.get(0)).span.getStart(),(parts.get(parts.size() - 1)).span.getEnd());
}
/**
* Prune the specified sentence parse of vacuous productions.
*
* @param parse
*/
public static void pruneParse(Parse parse) {
List nodes = new LinkedList<>();
nodes.add(parse);
while (nodes.size() != 0) {
Parse node = nodes.remove(0);
Parse[] children = node.getChildren();
if (children.length == 1 && node.getType().equals(children[0].getType())) {
int index = node.getParent().parts.indexOf(node);
children[0].setParent(node.getParent());
node.getParent().parts.set(index,children[0]);
node.parent = null;
node.parts = null;
}
nodes.addAll(Arrays.asList(children));
}
}
public static void fixPossesives(Parse parse) {
Parse[] tags = parse.getTagNodes();
for (int ti = 0; ti < tags.length; ti++) {
if (tags[ti].getType().equals("POS")) {
if (ti + 1 < tags.length && tags[ti + 1].getParent() == tags[ti].getParent().getParent()) {
int start = tags[ti + 1].getSpan().getStart();
int end = tags[ti + 1].getSpan().getEnd();
for (int npi = ti + 2; npi < tags.length; npi++) {
if (tags[npi].getParent() == tags[npi - 1].getParent()) {
end = tags[npi].getSpan().getEnd();
}
else {
break;
}
}
Parse npPos = new Parse(parse.getText(), new Span(start,end), "NP", 1 , tags[ti + 1]);
parse.insert(npPos);
}
}
}
}
/**
* Parses the specified tree-bank style parse string and return a Parse structure for that string.
*
* @param parse A tree-bank style parse string.
*
* @return a Parse structure for the specified tree-bank style parse string.
*/
public static Parse parseParse(String parse) {
return parseParse(parse,null);
}
/**
* Parses the specified tree-bank style parse string and return a Parse structure
* for that string.
*
* @param parse A tree-bank style parse string.
* @param gl The gap labeler.
*
* @return a Parse structure for the specified tree-bank style parse string.
*/
public static Parse parseParse(String parse, GapLabeler gl) {
StringBuilder text = new StringBuilder();
int offset = 0;
Stack stack = new Stack<>();
List cons = new LinkedList<>();
for (int ci = 0, cl = parse.length(); ci < cl; ci++) {
char c = parse.charAt(ci);
if (c == '(') {
String rest = parse.substring(ci + 1);
String type = getType(rest);
if (type == null) {
System.err.println("null type for: " + rest);
}
String token = getToken(rest);
stack.push(new Constituent(type, new Span(offset,offset)));
if (token != null) {
if (Objects.equals(type, "-NONE-") && gl != null) {
//System.err.println("stack.size="+stack.size());
gl.labelGaps(stack);
}
else {
cons.add(new Constituent(AbstractBottomUpParser.TOK_NODE,
new Span(offset, offset + token.length())));
text.append(token).append(" ");
offset += token.length() + 1;
}
}
}
else if (c == ')') {
Constituent con = stack.pop();
int start = con.getSpan().getStart();
if (start < offset) {
cons.add(new Constituent(con.getLabel(), new Span(start, offset - 1)));
}
}
}
String txt = text.toString();
int tokenIndex = -1;
Parse p = new Parse(txt, new Span(0, txt.length()), AbstractBottomUpParser.TOP_NODE, 1,0);
for (int ci = 0; ci < cons.size(); ci++) {
Constituent con = cons.get(ci);
String type = con.getLabel();
if (!type.equals(AbstractBottomUpParser.TOP_NODE)) {
if (AbstractBottomUpParser.TOK_NODE.equals(type)) {
tokenIndex++;
}
Parse c = new Parse(txt, con.getSpan(), type, 1,tokenIndex);
//System.err.println("insert["+ci+"] "+type+" "+c.toString()+" "+c.hashCode());
p.insert(c);
//codeTree(p);
}
}
return p;
}
/**
* Returns the parent parse node of this constituent.
*
* @return The parent parse node of this constituent.
*/
public Parse getParent() {
return parent;
}
/**
* Specifies the parent parse node for this constituent.
*
* @param parent The parent parse node for this constituent.
*/
public void setParent(Parse parent) {
this.parent = parent;
}
/**
* Indicates whether this parse node is a pos-tag.
*
* @return true if this node is a pos-tag, false otherwise.
*/
public boolean isPosTag() {
return (parts.size() == 1 &&
(parts.get(0)).getType().equals(AbstractBottomUpParser.TOK_NODE));
}
/**
* Returns true if this constituent contains no sub-constituents.
*
* @return true if this constituent contains no sub-constituents; false otherwise.
*/
public boolean isFlat() {
boolean flat = true;
for (int ci = 0; ci < parts.size(); ci++) {
flat &= (parts.get(ci)).isPosTag();
}
return flat;
}
public void isChunk(boolean ic) {
this.isChunk = ic;
}
public boolean isChunk() {
return isChunk;
}
/**
* Returns the parse nodes which are children of this node and which are pos tags.
*
* @return the parse nodes which are children of this node and which are pos tags.
*/
public Parse[] getTagNodes() {
List tags = new LinkedList<>();
List nodes = new LinkedList<>();
nodes.addAll(this.parts);
while (nodes.size() != 0) {
Parse p = nodes.remove(0);
if (p.isPosTag()) {
tags.add(p);
}
else {
nodes.addAll(0,p.parts);
}
}
return tags.toArray(new Parse[tags.size()]);
}
public Parse[] getTokenNodes() {
List tokens = new LinkedList<>();
List nodes = new LinkedList<>();
nodes.addAll(this.parts);
while (nodes.size() != 0) {
Parse p = nodes.remove(0);
if (p.getType().equals(AbstractBottomUpParser.TOK_NODE)) {
tokens.add(p);
}
else {
nodes.addAll(0, p.parts);
}
}
return tokens.toArray(new Parse[tokens.size()]);
}
/**
* Returns the deepest shared parent of this node and the specified node.
* If the nodes are identical then their parent is returned.
* If one node is the parent of the other then the parent node is returned.
*
* @param node The node from which parents are compared to this node's parents.
*
* @return the deepest shared parent of this node and the specified node.
*/
public Parse getCommonParent(Parse node) {
if (this == node) {
return parent;
}
Set parents = new HashSet<>();
Parse cparent = this;
while (cparent != null) {
parents.add(cparent);
cparent = cparent.getParent();
}
while (node != null) {
if (parents.contains(node)) {
return node;
}
node = node.getParent();
}
return null;
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (obj instanceof Parse) {
Parse p = (Parse) obj;
return Objects.equals(label, p.label) && span.equals(p.span)
&& text.equals(p.text) && parts.equals(p.parts);
}
return false;
}
@Override
public int hashCode() {
// Note: label is missing here!
return Objects.hash(span, text);
}
public int compareTo(Parse p) {
return Double.compare(p.getProb(), this.getProb());
}
/**
* Returns the derivation string for this parse if one has been created.
*
* @return the derivation string for this parse or null if no derivation string has been created.
*/
public StringBuffer getDerivation() {
return derivation;
}
/**
* Specifies the derivation string to be associated with this parse.
*
* @param derivation The derivation string to be associated with this parse.
*/
public void setDerivation(StringBuffer derivation) {
this.derivation = derivation;
}
private void codeTree(Parse p,int[] levels) {
Parse[] kids = p.getChildren();
StringBuilder levelsBuff = new StringBuilder();
levelsBuff.append("[");
int[] nlevels = new int[levels.length + 1];
for (int li = 0; li < levels.length; li++) {
nlevels[li] = levels[li];
levelsBuff.append(levels[li]).append(".");
}
for (int ki = 0; ki < kids.length; ki++) {
nlevels[levels.length] = ki;
System.out.println(levelsBuff.toString() + ki + "] " + kids[ki].getType() +
" " + kids[ki].hashCode() + " -> " + kids[ki].getParent().hashCode() +
" " + kids[ki].getParent().getType() + " " + kids[ki].getCoveredText());
codeTree(kids[ki],nlevels);
}
}
/**
* Prints to standard out a representation of the specified parse which
* contains hash codes so that parent/child relationships can be explicitly seen.
*/
public void showCodeTree() {
codeTree(this,new int[0]);
}
/**
* Utility method to inserts named entities.
*
* @param tag
* @param names
* @param tokens
*/
public static void addNames(String tag, Span[] names, Parse[] tokens) {
for (Span nameTokenSpan : names) {
Parse startToken = tokens[nameTokenSpan.getStart()];
Parse endToken = tokens[nameTokenSpan.getEnd() - 1];
Parse commonParent = startToken.getCommonParent(endToken);
//System.err.println("addNames: "+startToken+" .. "+endToken+" commonParent = "+commonParent);
if (commonParent != null) {
Span nameSpan = new Span(startToken.getSpan().getStart(), endToken.getSpan().getEnd());
if (nameSpan.equals(commonParent.getSpan())) {
commonParent.insert(new Parse(commonParent.getText(), nameSpan, tag, 1.0, endToken.getHeadIndex()));
} else {
Parse[] kids = commonParent.getChildren();
boolean crossingKids = false;
for (Parse kid : kids) {
if (nameSpan.crosses(kid.getSpan())) {
crossingKids = true;
}
}
if (!crossingKids) {
commonParent.insert(new Parse(commonParent.getText(), nameSpan,
tag, 1.0, endToken.getHeadIndex()));
} else {
if (commonParent.getType().equals("NP")) {
Parse[] grandKids = kids[0].getChildren();
if (grandKids.length > 1 && nameSpan.contains(grandKids[grandKids.length - 1].getSpan())) {
commonParent.insert(new Parse(commonParent.getText(), commonParent.getSpan(),
tag, 1.0, commonParent.getHeadIndex()));
}
}
}
}
}
}
}
}
