/*
* Copyright 2003-2013 the original author or authors.
*
* Licensed 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 org.codehaus.groovy.ast;
import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.util.ListHashMap;
/**
* Base class for any AST node. This class supports basic information used in all nodes of the AST:
* <ul>
* <li> line and column number information. Usually a node represents a certain
* area in a text file determined by a starting position and an ending position.
* For nodes that do not represent this, this information will be -1. A node can
* also be configured in its line/col information using another node through
* setSourcePosition(otherNode).</li>
* <li> every node can store meta data. A phase operation or transform can use
* this to transport arbitrary information to another phase operation or
* transform. The only requirement is that the other phase operation or transform
* runs after the part storing the information. If the information transport is
* done it is strongly recommended to remove that meta data.</li>
* <li> a text representation of this node trough getText(). This was in the
* past used for assertion messages. Since the usage of power asserts this
* method will not be called for this purpose anymore and might be removed in
* future versions of Groovy</li>
* </ul>
*
* @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
* @author <a href="maito:blackdrag@gmx.org">Jochen "blackdrag" Theodorou</a>
*/
public class ASTNode {
private int lineNumber = -1;
private int columnNumber = -1;
private int lastLineNumber = -1;
private int lastColumnNumber = -1;
private ListHashMap metaDataMap = null;
// GRECLIPSE: start
private int start = 0;
private int end = 0;
// end
public void visit(GroovyCodeVisitor visitor) {
throw new RuntimeException("No visit() method implemented for class: " + getClass().getName());
}
public String getText() {
return "<not implemented yet for class: " + getClass().getName() + ">";
}
public int getLineNumber() {
return lineNumber;
}
public void setLineNumber(int lineNumber) {
this.lineNumber = lineNumber;
}
public int getColumnNumber() {
return columnNumber;
}
public void setColumnNumber(int columnNumber) {
this.columnNumber = columnNumber;
}
public int getLastLineNumber() {
return lastLineNumber;
}
public void setLastLineNumber(int lastLineNumber) {
this.lastLineNumber = lastLineNumber;
}
public int getLastColumnNumber() {
return lastColumnNumber;
}
public void setLastColumnNumber(int lastColumnNumber) {
this.lastColumnNumber = lastColumnNumber;
}
// GRECLIPSE: start
public int getStart() {
return start;
}
public void setStart(int start) {
this.start = start;
}
public int getEnd() {
return end;
}
public void setEnd(int end) {
this.end = end;
}
public int getLength() {
return end >= 0 && start >= 0 ? end-start : -1;
}
// end
/**
* Sets the source position using another ASTNode.
* The sourcePosition consists of a line/column pair for
* the start and a line/column pair for the end of the
* expression or statement
// GRECLIPSE: start
* as well as the absolute start and end positions in the file
// end
*
* @param node - the node used to configure the position information
*/
public void setSourcePosition(ASTNode node) {
this.columnNumber = node.getColumnNumber();
this.lastLineNumber = node.getLastLineNumber();
this.lastColumnNumber = node.getLastColumnNumber();
this.lineNumber = node.getLineNumber();
// GRECLIPSE: start
this.start = node.getStart();
this.end = node.getEnd();
// end
}
/**
* Gets the node meta data.
*
* @param key - the meta data key
* @return the node meta data value for this key
*/
public <T> T getNodeMetaData(Object key) {
if (metaDataMap == null) {
return (T) null;
}
return (T) metaDataMap.get(key);
}
/**
* Copies all node meta data from the other node to this one
* @param other - the other node
*/
public void copyNodeMetaData(ASTNode other) {
if (other.metaDataMap == null) {
return;
}
if (metaDataMap == null) {
metaDataMap = new ListHashMap();
}
metaDataMap.putAll(other.metaDataMap);
}
/**
* Sets the node meta data.
*
* @param key - the meta data key
* @param value - the meta data value
* @throws GroovyBugError if key is null or there is already meta
* data under that key
*/
public void setNodeMetaData(Object key, Object value) {
if (key==null) throw new GroovyBugError("Tried to set meta data with null key on "+this+".");
if (metaDataMap == null) {
metaDataMap = new ListHashMap();
}
Object old = metaDataMap.put(key,value);
if (old!=null) throw new GroovyBugError("Tried to overwrite existing meta data "+this+".");
}
/**
* Sets the node meta data but allows overwriting values.
*
* @param key - the meta data key
* @param value - the meta data value
* @return the old node meta data value for this key
* @throws GroovyBugError if key is null
*/
public Object putNodeMetaData(Object key, Object value) {
if (key == null) throw new GroovyBugError("Tried to set meta data with null key on " + this + ".");
if (metaDataMap == null) {
metaDataMap = new ListHashMap();
}
return metaDataMap.put(key, value);
}
/**
* Removes a node meta data entry.
*
* @param key - the meta data key
* @throws GroovyBugError if the key is null
*/
public void removeNodeMetaData(Object key) {
if (key==null) throw new GroovyBugError("Tried to remove meta data with null key "+this+".");
if (metaDataMap == null) {
return;
}
metaDataMap.remove(key);
}
}