bundleplugin/src/main/java/aQute/bnd/header/OSGiHeader.java

package aQute.bnd.header;

import java.util.*;

import aQute.libg.generics.*;
import aQute.libg.qtokens.*;
import aQute.service.reporter.*;

public class OSGiHeader {

	static public Parameters parseHeader(String value) {
		return parseHeader(value, null);
	}

	/**
	 * Standard OSGi header parser. This parser can handle the format clauses
	 * ::= clause ( ',' clause ) + clause ::= name ( ';' name ) (';' key '='
	 * value ) This is mapped to a Map { name => Map { attr|directive => value }
	 * }
	 * 
	 * @param value
	 *            A string
	 * @return a Map<String,Map<String,String>>
	 */
	static public Parameters parseHeader(String value, Reporter logger) {
		return parseHeader(value, logger, new Parameters());
	}

	static public Parameters parseHeader(String value, Reporter logger, Parameters result) {
		if (value == null || value.trim().length() == 0)
			return result;

		QuotedTokenizer qt = new QuotedTokenizer(value, ";=,");
		char del = 0;
		do {
			boolean hadAttribute = false;
			Attrs clause = new Attrs();
			List<String> aliases = Create.list();
			String name = qt.nextToken(",;");

			del = qt.getSeparator();
			if (name == null || name.length() == 0) {
				if (logger != null && logger.isPedantic()) {
					logger.warning("Empty clause, usually caused by repeating a comma without any name field or by having spaces after the backslash of a property file: "
							+ value);
				}
				if (name == null)
					break;
			} else {
				name = name.trim();

				aliases.add(name);
				while (del == ';') {
					String adname = qt.nextToken();
					if ((del = qt.getSeparator()) != '=') {
						if (hadAttribute)
							if (logger != null) {
								logger.error("Header contains name field after attribute or directive: " + adname
										+ " from " + value
										+ ". Name fields must be consecutive, separated by a ';' like a;b;c;x=3;y=4");
							}
						if (adname != null && adname.length() > 0)
							aliases.add(adname.trim());
					} else {
						String advalue = qt.nextToken();
						if (clause.containsKey(adname)) {
							if (logger != null && logger.isPedantic())
								logger.warning("Duplicate attribute/directive name " + adname + " in " + value
										+ ". This attribute/directive will be ignored");
						}
						if (advalue == null) {
							if (logger != null)
								logger.error("No value after '=' sign for attribute " + adname);
							advalue = "";
						}
						clause.put(adname.trim(), advalue.trim());
						del = qt.getSeparator();
						hadAttribute = true;
					}
				}

				// Check for duplicate names. The aliases list contains
				// the list of nams, for each check if it exists. If so,
				// add a number of "~" to make it unique.
				for (String clauseName : aliases) {
					if (result.containsKey(clauseName)) {
						if (logger != null && logger.isPedantic())
							logger.warning("Duplicate name "
									+ clauseName
									+ " used in header: '"
									+ clauseName
									+ "'. Duplicate names are specially marked in Bnd with a ~ at the end (which is stripped at printing time).");
						while (result.containsKey(clauseName))
							clauseName += "~";
					}
					result.put(clauseName, clause);
				}
			}
		} while (del == ',');
		return result;
	}

	public static Attrs parseProperties(String input) {
		return parseProperties(input, null);
	}

	public static Attrs parseProperties(String input, Reporter logger) {
		if (input == null || input.trim().length() == 0)
			return new Attrs();

		Attrs result = new Attrs();
		QuotedTokenizer qt = new QuotedTokenizer(input, "=,");
		char del = ',';

		while (del == ',') {
			String key = qt.nextToken(",=");
			String value = "";
			del = qt.getSeparator();
			if (del == '=') {
				value = qt.nextToken(",=");
				del = qt.getSeparator();
			}
			result.put(key, value);
		}
		if (del != 0) {
			if (logger == null)
				throw new IllegalArgumentException("Invalid syntax for properties: " + input);
			logger.error("Invalid syntax for properties: " + input);
		}

		return result;
	}

}