proguard.classfile.util.kotlin.KotlinStringUtil Maven / Gradle / Ivy

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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * Licensed 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 proguard.classfile.util.kotlin;

/**
 * Kotlin String utility methods.
 *
 * @author James Hamilton
 */
public class KotlinStringUtil {
  private KotlinStringUtil() {}

  public static String capitializeFirstCharacterAsciiOnly(String s) {
    if (s.length() == 0) {
      return s;
    }

    char firstChar = s.charAt(0);

    if (firstChar >= 'a' && firstChar <= 'z') {
      return Character.toUpperCase(firstChar) + s.substring(1);
    } else {
      return s;
    }
  }

  public static String decapitializeFirstCharacterAsciiOnly(String s) {
    if (s.length() == 0) {
      return s;
    }

    char firstChar = s.charAt(0);

    if (firstChar >= 'A' && firstChar <= 'Z') {
      return Character.toLowerCase(firstChar) + s.substring(1);
    } else {
      return s;
    }
  }

  /**
   * Decaptialize according to the Kotlin compiler, basically first words are decapitialized.
   *
   * See capitializeDecapitialze.kt
   *
   * "FooBar" -> "fooBar" "FOOBar" -> "fooBar" "FOO" -> "foo" "FOO_BAR" -> "foo_BAR"
   */
  public static String decapitializeForKotlinCompiler(String s) {
    if (s.length() == 0 || !isUpperCaseAsciiCharAt(s, 0)) {
      return s;
    }

    if (s.length() == 1 || !isUpperCaseAsciiCharAt(s, 1)) {
      return decapitializeFirstCharacterAsciiOnly(s);
    }

    int secondWordStart = -1;
    for (int i = 0; i < s.length(); i++) {
      if (!isUpperCaseAsciiCharAt(s, i)) {
        secondWordStart = i;
        break;
      }
    }

    return secondWordStart == -1
        ? toLowerCaseAsciiOnly(s)
        : toLowerCaseAsciiOnly(s.substring(0, secondWordStart)) + s.substring(secondWordStart);
  }

  private static boolean isUpperCaseAsciiCharAt(String s, int index) {
    char charAtIndex = s.charAt(index);
    return charAtIndex >= 'A' && charAtIndex <= 'Z';
  }

  private static String toLowerCaseAsciiOnly(String s) {
    StringBuilder sb = new StringBuilder();

    for (char c : s.toCharArray()) {
      if (c >= 'A' && c <= 'Z') {
        sb.append(Character.toLowerCase(c));
      } else {
        sb.append(c);
      }
    }

    return sb.toString();
  }
}