Question

use PYTHON

Write a program that will take an input file called input.txt which will contain a Java program and parse it and output an annotated version.

Your program will track the nesting depth of the braces of the input file and will output an annotated version of the file.
Your final program will

1. List the nesting depth of curly braces
2. Ignore braces inside quotes or comments

Use Python

Assume that all quoted strings begin and end on the same line.


Sample INPUT:
-------------------
import blah;
class Foo
{
   void Foo()
    {
       System.out.println("braces are fun! {{{{{"); // ignored
       if (condition)
       {
          // also ignored: {
          int a = 1;
          // as is this: }
       }
    }
}
//end of program


Sample annotated OUTPUT:
-------------
0 import blah;
0 class Foo
1 {
1    void Foo()
2    {
2        System.out.println("braces are fun! {{{{{"); // ignored
2        if (condition)
3        {
3            // also ignored: {
3            int a = 1;
3            // as is this: }
3        }
2    }
1 }
0 // end of program

Extra credit
Handle block comments that cross multiple lines of the input file.

/* comment with
ignored brace { */

Answer 1

Code

# Open the file with read only permit

f = open('input.txt')

# use readline() to read the first line

line = f.readline()

# use the read line to read further.

# If the file is not empty keep reading one line

# at a time, till the file is empty

count=0

while line:

mainLine=line.rstrip()

line=line.strip()

if(line=="{"):

count+=1

print(str(count)+mainLine)

if(line=="}"):

count-=1

line = f.readline()

f.close()

output

code snaps

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