如何防止特殊字符后的文本存储-在Java的arraylist中 [英] How to prevent storing of text coming after special characters -- in arraylist in java

问题描述

我正在从文本文件中读取pl/sql代码，并将其所有单词从下面的代码存储到数组列表中:

I am reading a pl/sql code from a text file and storing all words of it into array list from below code :

Scanner in1 = new Scanner(file1);
ArrayList<String> Code1 = new ArrayList<String>();
in1.useDelimiter("/\\*[^*]*\\*+(?:[^/*][^*]*\\*+)*/|[\\p{javaWhitespace}\\.|,]+");
while (in1.hasNext())
  {
    Code1.add(in1.next().toLowerCase());
  }

一切工作正常，但是只要有特殊字符后的代码中有注释部分，我都会遇到问题-如下所示:

Everything is working fine but i am facing issue whenever there is a comments section in code written in after special character -- Like below:

select * from 
Dummy_Table --This is a, dummy.table
where id = 1 -- Filter.on, id

对于上面的代码，我不想在列表中存储注释(-这是一个dummy.table)和(--Filter.on，id).

For above code i don't want to store the comments (--This is a, dummy.table) and (-- Filter.on, id) in my list.How can i do this ?

in1.useDelimiter("/\\*[^*]*\\*+(?:[^/*][^*]*\\*+)*/|[\\p{javaWhitespace}\\.|,]+");

我正在使用上述分隔符来跳过/*和*/之间的注释部分，这是下面写的多行注释，但是包括此行，我也想跳过/存储单个语句注释，即-之后-行尾.

I am using above delimiter to skip reading comment section enclosed between /* and */, which is multiple line comments as written below but including this i also want to skip reading/storing the single statement comments i.e. after -- till the end of line.

/* 
|| This is a comments section in pl/sql code...||
|| Which i don't want to store..               ||
*/

推荐答案

要删除内联注释，您是否考虑过使用indexOf()和substring()的简单组合?另外，您应该使用in1.nextLine()而不是in1.next()吗?例如:

For removing inline comments, have you considered using the simple combination of indexOf() and substring()? Also, should you be using in1.nextLine() instead of in1.next()? For example:

while (in1.hasNext())
{
    String line = in1.nextLine();
    int indexOfComment = line.indexOf("--");
    if (indexOfComment > -1) {
        line = line.substring(0, indexOfComment);
    }
    Code1.add(line.toLowerCase());
}

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