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#!/usr/bin/perl -w -n
## defines function change_line that transforms old-style variable argument
## lists (...) into new-style varargin. va_arg() etc are also transformed.
BEGIN{
$va_arg_re = qr!^(\s*function\s*\w*.*?\(.*?)\.\.\.(\s*\).*)$!;
}
## Does necessary changes inplace on $_[0].
sub change_line {
if ($_[0] !~ /^\s*\#/) { # Don't do obvious comment lines
# Transform ... in function decalaration
$_[0] =~ s{$va_arg_re}{$1varargin$2}og;
# list(all_va_args) becomes varargin
$_[0] =~ s!list\s*\(\s*all_va_args\s*\)!varargin!og;
# all_va_args becomes varargin{:}
$_[0] =~ s!all_va_args!varargin{:}!og;
# va_start() can be delicate, so add a
# warning.
# declare a va_arg_cnt counter
$_[0] =~ s!(.*\b)va_start\b(\s*\(\s*\)|)(.*)!$1va_arg_cnt = 1$3\nwarn ("va_start should be transformed\\n");\n!g;
# Use that counter to substitute va_arg by
# nth (varargin, va_arg_cnt++)
$_[0] =~ s!(.*\b)va_arg\b(\s*\(\s*\)|)(.*)!$1nth (varargin, va_arg_cnt++)$3!g;
}
}
## Does it look like an underlined func that is not a function call?
sub comment_line {
0 ?
"## Hmmm ... is that a function call?\n" : "";
}
1;
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