/**
* Copyright 2009, Google Inc. All rights reserved.
* Licensed to PSF under a Contributor Agreement.
*/
package org.python.indexer.ast;
import org.python.indexer.Indexer;
import org.python.indexer.NBinding;
import org.python.indexer.Scope;
import org.python.indexer.types.NType;
import org.python.indexer.types.NUnknownType;
public class NName extends NNode {
static final long serialVersionUID = -1160862551327528304L;
public final String id; // identifier
public NName(String id) {
this(id, 0, 1);
}
public NName(String id, int start, int end) {
super(start, end);
if (id == null) {
throw new IllegalArgumentException("'id' param cannot be null");
}
this.id = id;
}
@Override
public NType resolve(Scope s) throws Exception {
NBinding b = s.lookup(id);
if (b == null) {
b = makeTempBinding(s);
}
Indexer.idx.putLocation(this, b);
return setType(b.followType());
}
/**
* Returns {@code true} if this name is structurally in a call position.
*/
public boolean isCall() {
// foo(...)
if (parent != null && parent.isCall() && this == ((NCall)parent).func) {
return true;
}
// <expr>.foo(...)
NNode gramps;
return parent instanceof NAttribute
&& this == ((NAttribute)parent).attr
&& (gramps = parent.parent) instanceof NCall
&& parent == ((NCall)gramps).func;
}
/**
* Create a temporary binding and definition for this name.
* If we later encounter a true definition we'll remove this
* node from the defs and add it to the refs.
*/
private NBinding makeTempBinding(Scope s) {
Scope scope = s.getScopeSymtab();
NBinding b = scope.put(id, this, new NUnknownType(), NBinding.Kind.SCOPE);
setType(b.getType().follow());
// Update the qname to this point in case we add attributes later.
// If we don't add attributes, this path extension is harmless/unused.
getTable().setPath(scope.extendPath(id));
return b;
}
/**
* Returns {@code true} if this name node is the {@code attr} child
* (i.e. the attribute being accessed) of an {@link NAttribute} node.
*/
public boolean isAttribute() {
return parent instanceof NAttribute
&& ((NAttribute)parent).getAttr() == this;
}
@Override
public String toString() {
return "<Name:" + start() + ":" + id + ">";
}
@Override
public void visit(NNodeVisitor v) {
v.visit(this);
}
}