C++ source code formatter

Question

I am coding a tool to parse C++ code. I don't want to end up coding half of a compiler. Even though I am aware of Clang, that is too much for my purposes.

I was hand-parsing, but have come up against one too many coding styles.

I seek a tool which will parse C++ code, with only one important factor :

It must be able to put the entire function declaration on a single line.

So, things like

unsigned
int
myclass::
myfunc
(int x;
int y)
{
}

and all of its many variations, should become

unsigned int myclass::myfunc(int x; int y)
{
}

That’s all that I need for this particular project - the ability to find each function in a file and get it's return type.

Nice if it's Linux, but I can live with Windows.

GUI would be nice, with preview being a bonus.

Batch mode would be nice, including the ability to recursively process a given directory.

But none of those nice are mandatory, only the single line for the function declaration requirement is.

Answer 1

http://astyle.sourceforge.net/

aStyle - no competition. I've been using this for a while now as I tend to write functions in notepad++ on my way to work and then beautify it with this before inclusion in projects - it really does a great job in my opinion.

Answer 2

GNU Indent can handle this:

indent b.c

Input:

unsigned
int
myfunc
(int x;
int y)
{
}

Output:

unsigned int myfunc (int x; int y)
{
}

Answer 3

I don't want to end up coding half of a compiler

It's not that complicated for the feature you're requesting. Here is a Perl script to start you off.

The arrays keywords_nospace and keywords_space contain the words/characters at the end of the lines you want to combine. The first is for combining without spaces, and the second appends spaces.

use strict;
use warnings;

open(my $in, "<", $ARGV[0]) or die "Can't open file: $!";
open(my $out, ">", "restructured_$ARGV[0]");

my $word;
my @keywords_nospace = ("::","myfunc");
my @keywords_space = ("unsigned","int",";");

while (<$in>) {
   for $word (@keywords_nospace) {chomp if (/\Q$word\E$/i);} # removes trailing spaces and newline
   for $word (@keywords_space)
     {
       if (/\Q$word\E$/i)
     {
       chomp; # Removes trailing spaces and newline
       $_ = "$_ "; # Add a space at the end of the line
     }
     }
  print $out $_;
}

You can add as many keywords as you like. Save in a .pl file, and run in the command line using:

perl script_name.pl input.cpp

This should create a new file in the directory called restructured_input.cpp. I've tested it on your example function and got the desired output.