java - 如何在不使用数组或任何正则表达式的情况下缩进包含特殊关键字的文本文件中的文本

Question

每次当前行包含一些特定关键字时，我的程序都必须使用数组或任何正则表达式来缩进文本文件中的文本。

示例；

start
write "enter your name
read name
write "enter your age"
read age
if age==100 then
do
print "you stink"
while age !=100
end if
while something
if something
do something
while something
end if
end 

应该是:

start

   write "enter your name"
   read name

   write "enter your age"
   read age

   if age==100 then
          do
          print "you stink"
          while age !=100
   end if
    while something
        if something
            do something
            while something
        end if
end

我无法让我的程序正确缩进第一个“关键字”之后的任何内容。关键字为“while、if、do、end if、end、start 等...”

我不允许使用数组或任何正则表达式

我的代码读取文本文件的部分:

    String corrIndent (String pseudocode2) {
    String sTrim = ""; //pseudocode to return
    String sTmp;

    int debut = 0; //current line start index
    int fin; //current line end index

    fin = pseudocode2.indexOf("\n", debut);//read lines

    do {
         //extracts current line 
         sTmp = pseudocode2.substring(debut, fin);
         //opens the do..while loop indent level

         if(sTmp.contains("do")){//opens do indent(indents 1 level)

             for (int i=1;i<=999;i++){

                 sTmp =pseudocode2.substring(debut, fin);
                 //sTrim="\t";
                 if (sTmp.contains("while")){//close do indent (reduce indentation 1 level)
                    i=999;//supposes that the text file is never that long

                 } 
                 //add current line to string to return
                 //with a newline.
                 sTrim = sTrim + sTmp+ ""+"   ";
                 //ajuster le debut de la ligne courante suivante
                 debut =  fin + 1;
                 //trouver la fin de la ligne courante suivante
                 fin = pseudocode2.indexOf("\n", debut);
             }
         } 


         {//when no more indentation is needed
             sTrim = sTrim + sTmp + "\n";

             debut = fin + 1;

             fin = pseudocode2.indexOf("\n", debut);
         }

    }while (fin != -1);
    return sTrim;
  }

使用此代码，我可以正确缩进 do block ，但如果该 do block 内有另一个关键字，它将不会获得新的缩进级别。

这是为什么？

我尝试了多种方法将缩进级别保存为变量，但没有成功。

Answer 1

This solution uses both arrays and regex - I am posting here for future coders that may not have that restriction.

这是我刚刚制作的一个快速示例。它允许您设置要缩进的单词数组以及哪些单词应触发缩进减少。

还有一些改进的空间，因为它无法捕获您可能需要的所有情况。

您还需要将输出写入文件。

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class Main {

    public static void main(String[] args) {

        final String IN_FILE = "test.txt";
        final String OUT_FILE = "sample/indent/result.txt";
        final int INDENT_SPACES = 4;    // Number of spaces to indent

        StringBuilder output = new StringBuilder();
        int currentIndentLevel = 0;

        // Increase indent level on these keywords
        String[] keywordsIn = {"start", "if", "do"};

        // Decrease indent level on these keywords
        String[] keywordsOut = {"while", "end"};

        // Read the file, line by line
        try {
            BufferedReader reader = new BufferedReader(new FileReader(IN_FILE));

            String line = reader.readLine();

            while (line != null) {

                // Indent the line based on current level
                for (int i = 0; i < INDENT_SPACES * currentIndentLevel; i++) {
                    output.append(" ");
                }
                output.append(line).append("\n");

                // Check if it contains a keyword
                for (int i = 0; i < keywordsIn.length; i++) {
                    // Line begins with a keyword to increase the indent
                    if (line.matches(keywordsIn[i] + "\\b.*")) {
                        currentIndentLevel += 1; // Increase the indent level
                    }
                }
                for (int i = 0; i < keywordsOut.length; i++) {
                    // Line begins with a keyword to decrease the indent
                    if (line.matches(keywordsOut[i] + "\\b.*")) {
                        currentIndentLevel -= 1; // Decrease the indent level
                    }
                }


                // Get next line
                line = reader.readLine();

            }

        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println(output.toString());
    }
}

采用原始输入文件，这就是该程序的输出:

start
    write "enter your name
    read name
    write "enter your age"
    read age
    if age==100 then
        do
            print "you stink"
            while age !=100
        end if
    while something
if something
    do something
        while something
    end if
end