/*
 * 作成日: 2004/06/13
 * License Apache 2.0
 * この生成されたコメントの挿入されるテンプレートを変更するため
 * ウィンドウ > 設定 > Java > コード生成 > コードとコメント
 */
package org.jpn.xucker.ant.filter;

import java.io.IOException;
import java.io.Reader;
import java.util.Vector;

import org.apache.tools.ant.filters.BaseParamFilterReader;
import org.apache.tools.ant.filters.ChainableReader;
import org.apache.tools.ant.types.Parameter;

public final class StripTag
	extends BaseParamFilterReader
	implements ChainableReader {

	private boolean inTag;
	private boolean inComment;
	private boolean inSingleQuote;
	private boolean inDoubleQuote;

	private String buffer = null;
	public StripTag() {
		super();
	}

	public StripTag(final Reader in) {
		super(in);
	}

	public final int read() throws IOException {

		if (!getInitialized()) {
			initialize();
			setInitialized(true);
		}

		int ch = -1;
		if (buffer != null) {
			ch = (int) buffer.charAt(0);
			buffer = buffer.substring(1);
			if (buffer.length() == 0)
				buffer = null;
		} else {
			ch = in.read();
			if (ch == -1)
				return ch; //return end.
		}

		char character = (char) ch;
		if (inTag) {
			//now not support single & double quote.becouse of it is often using of mistaking double or single quote.
			/*
			if (inSingleQuote) {
				if (character == '\'') {
					inSingleQuote = false;
				}
			} else if (inDoubleQuote) {
				if (character == '"') {
					inDoubleQuote = false;
				}
			} else {
			*/
				if (character == '>') {
					inTag = false;
					return read();
				} /*else if (character == '\'') {
					inSingleQuote = true;
				} else if (character == '"') {
					inDoubleQuote = true;
				}
			
			}
			*/
			return read();
		} else if (inComment) {
			if (character == '-') {
				int next1 = in.read();
				int next2 = in.read();
				if ((char) next1 == '-' && (char) next2 == '>') {
					inComment = false;
					return read();
				} else {
					buffer = "";
					if (next1 != -1)
						buffer += (char) next1;
					if (next2 != -1)
						buffer += (char) next2;
					if (buffer.length() == 0)
						buffer = null;
					return read();

				}
			} else {
				return read();
			}
		} else if (inSingleQuote) {

		} else if (inDoubleQuote) {

		} else {
			if (character == '<') {

				int next1 = in.read();
				int next2 = in.read();
				int next3 = in.read();
				if ((char) next1 == '!'
					&& (char) next2 == '-'
					&& (char) next3 == '-') {
					inComment = true;

				} else {
					inTag = true;
					buffer = "";
					if (next1 != -1)
						buffer += (char) next1;

					if (next2 != -1)
						buffer += (char) next2;

					if (next3 != -1)
						buffer += (char) next3;

					if (buffer.length() == 0)
						buffer = null;
				}

				return read();
			}
		}

		return ch;
	}

	/**
	 * Creates a new LineContains using the passed in
	 * Reader for instantiation.
	 *
	 * @param rdr A Reader object providing the underlying stream.
	 *            Must not be <code>null</code>.
	 *
	 * @return a new filter based on this configuration, but filtering
	 *         the specified reader
	 */
	public final Reader chain(final Reader rdr) {
		StripTag newFilter = new StripTag(rdr);
		newFilter.setInitialized(true);
		return newFilter;
	}

	/**
	 * Parses the parameters to add user-defined contains strings.
	 */
	private final void initialize() {
		inTag = false;
		inComment = false;
		inSingleQuote = false;
		inDoubleQuote = false;
	}

}