com.twineworks.tweakflow.repl.util.Tokenizer Maven / Gradle / Ivy

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Twineworks GmbH
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.twineworks.tweakflow.repl.util;

import java.util.ArrayList;
import java.util.StringTokenizer;

public class Tokenizer {

  // little helper to split quoted string to args based on
  // http://stackoverflow.com/questions/3259143/split-a-string-containing-command-line-parameters-into-a-string-in-java

  public static String[] parseCommandLine(String cmd) {

    if (cmd == null || cmd.length() == 0) {
      return new String[0];
    }

    final int normal = 0;
    final int inQuote = 1;
    final int inDoubleQuote = 2;
    int state = normal;
    final StringTokenizer tok = new StringTokenizer(cmd, "\"\' ", true);
    final ArrayList result = new ArrayList<>();
    final StringBuilder current = new StringBuilder();
    boolean lastTokenHasBeenQuoted = false;

    while (tok.hasMoreTokens()) {
      String nextTok = tok.nextToken();
      switch (state) {
        case inQuote:
          if ("\'".equals(nextTok)) {
            lastTokenHasBeenQuoted = true;
            state = normal;
          } else {
            current.append(nextTok);
          }
          break;
        case inDoubleQuote:
          if ("\"".equals(nextTok)) {
            lastTokenHasBeenQuoted = true;
            state = normal;
          } else {
            current.append(nextTok);
          }
          break;
        default:
          if ("\'".equals(nextTok)) {
            state = inQuote;
          } else if ("\"".equals(nextTok)) {
            state = inDoubleQuote;
          } else if (" ".equals(nextTok)) {
            if (lastTokenHasBeenQuoted || current.length() != 0) {
              result.add(current.toString());
              current.setLength(0);
            }
          } else {
            current.append(nextTok);
          }
          lastTokenHasBeenQuoted = false;
          break;
      }
    }
    if (lastTokenHasBeenQuoted || current.length() != 0) {
      result.add(current.toString());
    }
    if (state == inQuote || state == inDoubleQuote) {
      throw new RuntimeException("unbalanced quotes in " + cmd);
    }
    return result.toArray(new String[result.size()]);
  }

}