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PythonTreeAdaptor.java
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169 lines (149 loc) · 4.52 KB
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package org.python.antlr;
import org.antlr.runtime.CommonToken;
import org.antlr.runtime.RecognitionException;
import org.antlr.runtime.Token;
import org.antlr.runtime.TokenStream;
import org.antlr.runtime.tree.CommonTreeAdaptor;
public class PythonTreeAdaptor extends CommonTreeAdaptor {
@Override
public void setTokenBoundaries(Object t, Token startToken, Token stopToken) {
if (t==null) {
return;
}
//System.out.println("setting boundries on '"+t+"' with start: '" + startToken + "' and '" +
// stopToken + "'");
int start = 0;
int stop = 0;
int startChar = 0;
int stopChar = 0;
if (startToken!=null) {
start = startToken.getTokenIndex();
startChar = ((CommonToken)startToken).getStartIndex();
}
if (stopToken!=null) {
stop = stopToken.getTokenIndex();
stopChar = ((CommonToken)stopToken).getStopIndex() + 1;
}
PythonTree pt = (PythonTree)t;
pt.setTokenStartIndex(start);
pt.setTokenStopIndex(stop);
pt.setCharStartIndex(startChar);
pt.setCharStopIndex(stopChar);
}
@Override
public Object create(Token token) {
return new PythonTree(token);
}
@Override
public Object errorNode(TokenStream input, Token start, Token stop,
RecognitionException e)
{
PythonErrorNode t = new PythonErrorNode(input, start, stop, e);
//System.out.println("returning error node '"+t+"' @index="+input.index());
return t;
}
@Override
public Object dupNode(Object t) {
if (t == null) {
return null;
}
return create(((PythonTree) t).getToken());
}
@Override
public boolean isNil(Object tree) {
return ((PythonTree)tree).isNil();
}
@Override
public void addChild(Object t, Object child) {
if ( t!=null && child!=null ) {
((PythonTree)t).addChild((PythonTree)child);
}
}
@Override
public Object becomeRoot(Object newRoot, Object oldRoot) {
//System.out.println("becomeroot new "+newRoot.toString()+" old "+oldRoot);
PythonTree newRootTree = (PythonTree)newRoot;
PythonTree oldRootTree = (PythonTree)oldRoot;
if ( oldRoot==null ) {
return newRoot;
}
// handle ^(nil real-node)
if ( newRootTree.isNil() ) {
int nc = newRootTree.getChildCount();
if ( nc==1 ) newRootTree = newRootTree.getChild(0);
else if ( nc >1 ) {
// TODO: make tree run time exceptions hierarchy
throw new RuntimeException("more than one node as root (TODO: make exception hierarchy)");
}
}
// add oldRoot to newRoot; addChild takes care of case where oldRoot
// is a flat list (i.e., nil-rooted tree). All children of oldRoot
// are added to newRoot.
newRootTree.addChild(oldRootTree);
return newRootTree;
}
@Override
public Object rulePostProcessing(Object root) {
//System.out.println("rulePostProcessing: "+((PythonTree)root).toStringTree());
PythonTree r = (PythonTree)root;
if ( r!=null && r.isNil() ) {
if ( r.getChildCount()==0 ) {
r = null;
}
else if ( r.getChildCount()==1 ) {
r = r.getChild(0);
// whoever invokes rule will set parent and child index
r.setParent(null);
r.setChildIndex(-1);
}
}
return r;
}
@Override
public Object create(int tokenType, Token fromToken) {
fromToken = createToken(fromToken);
//((ClassicToken)fromToken).setType(tokenType);
fromToken.setType(tokenType);
PythonTree t = (PythonTree)create(fromToken);
return t;
}
@Override
public Object create(int tokenType, Token fromToken, String text) {
fromToken = createToken(fromToken);
fromToken.setType(tokenType);
fromToken.setText(text);
PythonTree t = (PythonTree)create(fromToken);
return t;
}
@Override
public Object create(int tokenType, String text) {
Token fromToken = createToken(tokenType, text);
PythonTree t = (PythonTree)create(fromToken);
return t;
}
@Override
public int getType(Object t) {
((PythonTree)t).getType();
return 0;
}
@Override
public String getText(Object t) {
return ((PythonTree)t).getText();
}
@Override
public Object getChild(Object t, int i) {
return ((PythonTree)t).getChild(i);
}
@Override
public void setChild(Object t, int i, Object child) {
((PythonTree)t).setChild(i, (PythonTree)child);
}
@Override
public Object deleteChild(Object t, int i) {
return ((PythonTree)t).deleteChild(i);
}
@Override
public int getChildCount(Object t) {
return ((PythonTree)t).getChildCount();
}
}