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Powerful multi-pass preprocessor to process directives situated in C-styled commentaries
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/*
 * Copyright 2002-2019 Igor Maznitsa (http://www.igormaznitsa.com)
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.igormaznitsa.meta.common.utils;


import javax.annotation.Nonnull;

import static com.igormaznitsa.meta.common.utils.Assertions.assertNotNull;

/**
 * Set of auxiliary string functions.
 *
 * @since 1.1.2
 */
public final class StrUtils {
  private StrUtils() {

  }

  /**
   * Trim left white spaces in string.
   *
   * @param value string to be trimmed
   * @return trimmed string
   * @since 1.1.2
   */
  @Nonnull
  public static String trimLeft(@Nonnull final String value) {
    final StringBuilder result = new StringBuilder(assertNotNull(value).length());
    int index = 0;
    for (; index < value.length(); index++) {
      final char chr = value.charAt(index);
      if (!(Character.isWhitespace(chr) || Character.isISOControl(chr))) {
        break;
      }
    }
    if (index < value.length()) {
      result.append(value, index, value.length());
    }
    return result.toString();
  }

  /**
   * Trim right white spaces in string.
   *
   * @param value string to be trimmed
   * @return trimmed string
   */
  @Nonnull
  public static String trimRight(@Nonnull final String value) {
    final StringBuilder result = new StringBuilder(assertNotNull(value).length());
    int index = value.length() - 1;
    for (; index >= 0; index--) {
      final char chr = value.charAt(index);
      if (!(Character.isWhitespace(chr) || Character.isISOControl(chr))) {
        break;
      }
    }
    if (index > 0) {
      result.append(value, 0, index + 1);
    }
    return result.toString();
  }

  /**
   * Remove all white space chars and ISO control chars.
   *
   * @param value string to be processed
   * @return pressed string without white spaces and control chars
   * @since 1.1.2
   */
  @Nonnull
  public static String pressing(@Nonnull final String value) {
    final StringBuilder result = new StringBuilder(assertNotNull(value).length());
    for (int index = 0; index < value.length(); index++) {
      final char chr = value.charAt(index);
      if (Character.isWhitespace(chr) || Character.isISOControl(chr)) {
        continue;
      }
      result.append(chr);
    }
    return result.toString();
  }
}