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/*
 * [The "BSD license"]
 *  Copyright (c) 2010 Terence Parr
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.antlr.tool;

import java.util.ArrayList;
import java.util.List;

/** A tree of grammars */
public class CompositeGrammarTree {
	protected List children;
	public Grammar grammar;

	/** Who is the parent node of this node; if null, implies node is root */
	public CompositeGrammarTree parent;

	public CompositeGrammarTree(Grammar g) {
		grammar = g;
	}

	public void addChild(CompositeGrammarTree t) {
		//System.out.println("add "+t.toStringTree()+" as child to "+this.toStringTree());
		if ( t==null ) {
			return; // do nothing upon addChild(null)
		}
		if ( children==null ) {
			children = new ArrayList();
		}
		children.add(t);
		t.parent = this;
	}

	/** Find a rule by looking in current grammar then down towards the
	 *  delegate grammars.
	 */
	public Rule getRule(String ruleName) {
		Rule r = grammar.getLocallyDefinedRule(ruleName);
		for (int i = 0; r==null && children!=null && i < children.size(); i++) {
			CompositeGrammarTree child = children.get(i);
			r = child.getRule(ruleName);
		}
		return r;
	}

	/** Find an option by looking up towards the root grammar rather than down */
	public Object getOption(String key) {
		if ( grammar.tool!=null && key!=null && key.equals("language") &&
			 grammar.tool.forcedLanguageOption!=null ) {
			return grammar.tool.forcedLanguageOption;
		}
		Object o = grammar.getLocallyDefinedOption(key);
		if ( o!=null ) {
			return o;
		}
		if ( parent!=null ) {
			return parent.getOption(key);
		}
		return null; // not found
	}

	public CompositeGrammarTree findNode(Grammar g) {
		if ( g==null ) {
			return null;
		}
		if ( this.grammar == g ) {
			return this;
		}
		CompositeGrammarTree n = null;
		for (int i = 0; n==null && children!=null && i < children.size(); i++) {
			CompositeGrammarTree child = children.get(i);
			n = child.findNode(g);
		}
		return n;
	}

	public CompositeGrammarTree findNode(String grammarName) {
		if ( grammarName==null ) {
			return null;
		}
		if ( grammarName.equals(this.grammar.name) ) {
			return this;
		}
		CompositeGrammarTree n = null;
		for (int i = 0; n==null && children!=null && i < children.size(); i++) {
			CompositeGrammarTree child = children.get(i);
			n = child.findNode(grammarName);
		}
		return n;
	}

	/** Return a postorder list of grammars; root is last in list */
	public List getPostOrderedGrammarList() {
		List grammars = new ArrayList();
		_getPostOrderedGrammarList(grammars);
		return grammars;
	}

	/** work for getPostOrderedGrammarList */
	protected void _getPostOrderedGrammarList(List grammars) {
		for (int i = 0; children!=null && i < children.size(); i++) {
			CompositeGrammarTree child = children.get(i);
			child._getPostOrderedGrammarList(grammars);
		}
		grammars.add(this.grammar);
	}

	/** Return a preorder list of grammars; root is first in list */
	public List getPreOrderedGrammarList() {
		List grammars = new ArrayList();
		_getPreOrderedGrammarList(grammars);
		return grammars;
	}

	protected void _getPreOrderedGrammarList(List grammars) {
		grammars.add(this.grammar);
		for (int i = 0; children!=null && i < children.size(); i++) {
			CompositeGrammarTree child = children.get(i);
			child._getPreOrderedGrammarList(grammars);
		}
	}

	public void trimLexerImportsIntoCombined() {
		CompositeGrammarTree p = this;
		if ( p.grammar.type == Grammar.LEXER && p.parent!=null &&
			 p.parent.grammar.type == Grammar.COMBINED )
		{
			//System.out.println("wacking "+p.grammar.name+" from "+p.parent.grammar.name);
			p.parent.children.remove(this);
		}
		for (int i = 0; children!=null && i < children.size(); i++) {
			CompositeGrammarTree child = children.get(i);
			child.trimLexerImportsIntoCombined();
		}
	}
}