/*
 * [The "BSD license"]
 *  Copyright (c) 2010 Terence Parr and Alan Condit
 *  Copyright (c) 2006 Kay Roepke (Objective-C runtime)
 *  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.codegen;

import org.antlr.Tool;
import org.antlr.misc.Utils;
import org.stringtemplate.v4.ST;
import org.antlr.tool.Grammar;

import java.io.IOException;

public class ObjCTarget extends Target {
	@Override
	protected void genRecognizerHeaderFile(Tool tool,
										   CodeGenerator generator,
										   Grammar grammar,
										   ST headerFileST,
										   String extName)
	throws IOException
	{
		generator.write(headerFileST, grammar.name + Grammar.grammarTypeToFileNameSuffix[grammar.type] + extName);
	}

	@Override
	public String getTargetCharLiteralFromANTLRCharLiteral(CodeGenerator generator,
														   String literal)
	{
		if  (literal.startsWith("'\\u") ) {
			literal = "0x" +literal.substring(3, 7);
		} else	{
			int c = literal.charAt(1); // TJP
			if  (c < 32 || c > 127) {
				literal  =  "0x" + Integer.toHexString(c);
			}
		}

		return literal;
	}

	/** Convert from an ANTLR string literal found in a grammar file to
	*  an equivalent string literal in the target language.  For Java, this
	*  is the translation 'a\n"' &rarr; "a\n\"".  Expect single quotes
	*  around the incoming literal.  Just flip the quotes and replace
	*  double quotes with \"
	*/
	@Override
	public String getTargetStringLiteralFromANTLRStringLiteral(CodeGenerator generator,
															   String literal)
	{
		literal = Utils.replace(literal,"\"","\\\"");
		StringBuilder buf = new StringBuilder(literal);
		buf.setCharAt(0,'"');
		buf.setCharAt(literal.length()-1,'"');
		buf.insert(0,'@');
		return buf.toString();
	}

	/** If we have a label, prefix it with the recognizer's name */
	@Override
	public String getTokenTypeAsTargetLabel(CodeGenerator generator, int ttype) {
		String name = generator.grammar.getTokenDisplayName(ttype);
		// If name is a literal, return the token type instead
		if ( name.charAt(0)=='\'' ) {
			return String.valueOf(ttype);
		}
		return name;
		//return generator.grammar.name + Grammar.grammarTypeToFileNameSuffix[generator.grammar.type] + "_" + name;
		//return super.getTokenTypeAsTargetLabel(generator, ttype);
		//return this.getTokenTextAndTypeAsTargetLabel(generator, null, ttype);
	}

	/** Target must be able to override the labels used for token types. Sometimes also depends on the token text.*/
	public String getTokenTextAndTypeAsTargetLabel(CodeGenerator generator, String text, int tokenType) {
		String name = generator.grammar.getTokenDisplayName(tokenType);
		// If name is a literal, return the token type instead
		if ( name.charAt(0)=='\'' ) {
			return String.valueOf(tokenType);
		}
		String textEquivalent = text == null ? name : text;
		if (textEquivalent.charAt(0) >= '0' && textEquivalent.charAt(0) <= '9') {
			return textEquivalent;
		} else {
			return generator.grammar.name + Grammar.grammarTypeToFileNameSuffix[generator.grammar.type] + "_" + textEquivalent;
		}
	}

}