net.moznion.random.string.UserDefinedLetterPickerScanner Maven / Gradle / Ivy

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package net.moznion.random.string;

import lombok.Getter;

import java.util.ArrayList;
import java.util.List;

class UserDefinedLetterPickerScanner {
  @Getter
  public static class ScannedUserDefinedPicker {
    private final int cursor;
    private final String key;
    private final List bounds;

    public ScannedUserDefinedPicker(
        final int cursorForScanning, final String key, final List bounds) {
      this.cursor = cursorForScanning;
      this.key = key;
      this.bounds = bounds;
    }
  }

  public static ScannedUserDefinedPicker scan(final String[] regexCharacters, final int index) {
    String key = "";
    String character;
    List bounds = new ArrayList<>();

    int i = index;
    while (!(character = regexCharacters[++i]).equals("]")) {
      if (character.equals("-") && !bounds.isEmpty()) {
        String beginCharacter = bounds.get(bounds.size() - 1); // take from tail
        String endCharacter = regexCharacters[++i]; // take from after "-"

        key += beginCharacter + "-" + endCharacter;

        bounds.add(endCharacter);
      } else {
        if (String.valueOf(character).matches("\\W")) {
          throw new RuntimeException("'" + character + "'" + "will be treated literally inside []");
        }
        bounds.add(character);
      }
    }

    return new ScannedUserDefinedPicker(i, key, bounds);
  }
}