org.osgi.service.indexer.impl.util.QuotedTokenizer Maven / Gradle / Ivy

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/**
 * ==========================================================================
 * Copyright © 2015-2018 OSGi Alliance, Cristiano Gavião.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Cristiano Gavião ([email protected])- initial API and implementation
 * ==========================================================================
 */
package org.osgi.service.indexer.impl.util;

import java.util.List;

public class QuotedTokenizer {
    String string;
    int index = 0;
    String separators;
    boolean returnTokens;
    boolean ignoreWhiteSpace = true;
    String peek;
    char separator;

    public QuotedTokenizer(String string, String separators,
            boolean returnTokens) {
        if (string == null)
            throw new IllegalArgumentException(
                    "string argument must be not null");
        this.string = string;
        this.separators = separators;
        this.returnTokens = returnTokens;
    }

    public QuotedTokenizer(String string, String separators) {
        this(string, separators, false);
    }

    public String nextToken(String pSeparators) {
        separator = 0;
        if (peek != null) {
            String tmp = peek;
            peek = null;
            return tmp;
        }

        if (index == string.length())
            return null;

        StringBuilder sb = new StringBuilder();

        while (index < string.length()) { // NOSONAR
            char c = string.charAt(index++);

            if (Character.isWhitespace(c)) {
                if (index == string.length())
                    break;
                sb.append(c);
                continue;
            }

            if (pSeparators.indexOf(c) >= 0) {
                if (returnTokens)
                    peek = Character.toString(c);
                else
                    separator = c;
                break;
            }

            switch (c) {
            case '"':
            case '\'':
                quotedString(sb, c);
                break;

            default:
                sb.append(c);
            }
        }
        String result = sb.toString().trim();
        if (result.length() == 0 && index == string.length())
            return null;
        return result;
    }

    public String nextToken() {
        return nextToken(separators);
    }

    private void quotedString(StringBuilder sb, char c) {
        char quote = c;
        while (index < string.length()) {
            c = string.charAt(index++);
            if (c == quote)
                break;
            if (c == '\\' && index < string.length()
                    && string.charAt(index + 1) == quote)
                c = string.charAt(index++);
            sb.append(c);
        }
    }

    public String[] getTokens() {
        return getTokens(0);
    }

    private String[] getTokens(int cnt) {
        String token = nextToken();
        if (token == null)
            return new String[cnt];

        String[] result = getTokens(cnt + 1);
        result[cnt] = token;
        return result;
    }

    public char getSeparator() {
        return separator;
    }

    public List getTokenSet() {
        List list = Create.list();
        String token = nextToken();
        while (token != null) {
            list.add(token);
            token = nextToken();
        }
        return list;
    }
}