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我需要帮助将摩尔斯电码转换为英语。我已经编写并测试了将英语翻译成莫尔斯语的代码。我的主要问题是将莫尔斯电码中的所有字符放在一起，然后再将其翻译成英文字符（如果有意义的话）。

例子： ”。” 翻译成 E 和 ... 翻译成 S，但我不希望翻译在到达 ...

很少有规则-空格用于分隔莫尔斯字母-| 用作分隔单词的分隔符 - 不能使用哈希图 :(

这是我的代码

import java.util.Arrays;
import javax.swing.JOptionPane;

public class test3
{
public static void main ( String [] args )
{

    String s1 = "Morse";

    // Decide whether Morse code or English
    String decide = JOptionPane.showInputDialog("Enter 'English' for Morse to English code translation and 'Morse' for English to Morse code translation. Pay attention to Caps.");

    // Enter String & decide whether to convert to Morse or English
    String phrase = JOptionPane.showInputDialog("Enter the words you wish to translate.");

    if ( decide.equals( s1 ))
        toMorse( phrase );

    else
        toEnglish( phrase );
}

// Translate to Morse
public static void toMorse( String preTranslation )
{

    String[] english = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","1","2","3","4","5","6","7","8","9","0"};

    String[] morse = {".-","-...","-.-.","-..",".","..-.","--.","....","..", ".---",
            "-.-",".-..","--","-.","---",".--.","--.-",".-.","...","-","..-", 
            "...-",".--","-..-","-.--","--..",".----","..---","...--","....-",".....","-....","--...","---..","----.","-----"};
    // Remove uppercase
    String preTrans = preTranslation.toLowerCase();

    // Deletes spaces
    String phraseWithDelimiter = preTrans.replace( " ", "|");

    String[] translation = new String[phraseWithDelimiter.length()];
    String[] delimiter = {"|"};

    // Translate 
    for ( int arrayVar = 0, transArrayVar = 0, subStringVarB = 0, subStringVarE = 1; transArrayVar < phraseWithDelimiter.length();)
    {
        if( phraseWithDelimiter.substring(subStringVarB, subStringVarE).equals( delimiter[0] ) )
        {
            translation[transArrayVar] = delimiter[0];
            transArrayVar++;
            subStringVarB++;
            subStringVarE++;
        }
        else if ( phraseWithDelimiter.substring(subStringVarB, subStringVarE).equals( english[arrayVar] ) )
            {
                translation[transArrayVar] = morse[arrayVar];
                transArrayVar++;
                subStringVarB++;
                subStringVarE++;
                arrayVar = 0;
            }
            else
            {
                arrayVar++;
                if ( arrayVar == 35 )
                {
                    arrayVar = 0;
                    subStringVarB++;
                    subStringVarE++;
                    transArrayVar++;
                }
            }
    }
String morseSeparator = new String( " " );
arrayToString ( translation, morseSeparator );

}


//Convert array to string and print translation
public static void arrayToString(String[] trans, String separator) 
{
    String result = "";
    if (trans.length > 0) 
    {
            result = trans[0];    // start with the first element
            for (int i = 1; i < trans.length; i++)
                result = result + separator + trans[i];
        }
    System.out.println( result );
}

    // unfinished
public static void toEnglish( String preTranslation)
{
    }

我正在考虑制作一个 for 语句并将摩尔斯电码的每个字符分配给一个新字符串，直到我到达一个空格，然后使用它进行测试，但我不确定如何做到这一点。

任何帮助表示感谢！

4

2 回答 2

3

创建一个包含所有摩尔斯电码序列的正则表达式，按从最长到最短的顺序排列。

 Pattern.compile("----\\.|-----|---\\.\\.|...")

然后将其与字符串重复匹配以获得最长的有效摩尔斯电码序列。

或者，您可以使用像JavaCC这样的解析器编译器。

SKIP : { " " }
TOKEN : { < A : "-." > }
TOKEN : { < B : "-..." > }
TOKEN : { < C : "-.-." > }
...

String translate() :
{ StringBuilder sb; }
{
  { sb = new StringBuilder(); }

  (
    letter(sb)
  )*
  <EOF>

  { return sb.toString(); }
}

void letter(StringBuilder sb) :
{}
{
  ( <A>
    { sb.append('a'); }
  | <B>
    { sb.append('b'); }
  | <C>
    { sb.append('c'); }
  ...
  )
}
于 2012-08-23T16:47:56.250 回答
1

为了翻译文本，您可以先尝试在单词分隔符上拆分，然后在字符限制符上拆分。然后一一处理单词。与此类似：

String morseInput = //whatever, only delimiters or morse characters

String[] words = morseInput.split("-|");
for( String word : words ) {
  String[] characters = word.split("\\s");

  for( String c : characters ) {
    //look up the english character for c - I'd use a map here
  }
}

几点注意事项：

  • 为简洁起见，我省略了对空字符串和 null 的检查
  • 我还省略了构建最终翻译字符串的任何代码，这对你来说是一个练习
  • 我会使用 aMap<String, String>进行查找，如果不允许，请在源数组中查找字符的索引，然后从翻译数组中获取该索引处的翻译
于 2012-08-23T16:43:10.740 回答