package nativeapi;

use strict;

sub new {
    my $proto = shift;
    my $class = ref($proto) || $proto;
    my $self  = {};
    bless ($self, $class);

    my $output = \${$self->{OUTPUT}};
    my $functions = \%{$self->{FUNCTIONS}};
    my $conditionals = \%{$self->{CONDITIONALS}};
    my $conditional_headers = \%{$self->{CONDITIONAL_HEADERS}};
    my $conditional_functions = \%{$self->{CONDITIONAL_FUNCTIONS}};

    $$output = shift;
    my $api_file = shift;
    my $configure_in_file = shift;
    my $config_h_in_file = shift;

    $api_file =~ s/^\.\///;
    $configure_in_file =~ s/^\.\///;
    $config_h_in_file =~ s/^\.\///;

    $$output->progress("$api_file");

    open(IN, "< $api_file");
    $/ = "\n";
    while(<IN>) {
	s/^\s*?(.*?)\s*$/$1/; # remove whitespace at begin and end of line
	s/^(.*?)\s*#.*$/$1/;  # remove comments
	/^$/ && next;         # skip empty lines   
	
	$$functions{$_}++;
    }
    close(IN);

    $$output->progress("$configure_in_file");

    my $again = 0;
    open(IN, "< $configure_in_file");   
    local $/ = "\n";
    while($again || (defined($_ = <IN>))) {
	$again = 0;
	chomp;
	if(/(.*)\\$/) {
	    my $line = <IN>;
	    if(defined($line)) {
		$_ = $1 . " " . $line;
		$again = 1;
		next;
	    }
	}
	# remove leading and trailing whitespace
	s/^\s*(.*?)\s*$/$1/;

	if(/^AC_CHECK_HEADERS\(\s*(.*?)\)\s*$/) {
	    my @arguments = split(/,/,$1);
	    foreach my $name (split(/\s+/, $arguments[0])) {		
		$$conditional_headers{$name}++;
	    }
	} elsif(/^AC_CHECK_FUNCS\(\s*(.*?)\)\s*$/) {
	    my @arguments = split(/,/,$1);
	    foreach my $name (split(/\s+/, $arguments[0])) {		
		$$conditional_functions{$name}++;
	    }
	} elsif(/^AC_FUNC_ALLOCA/) {
	    $$conditional_headers{"alloca.h"}++;
	}

    }
    close(IN);

    $$output->progress("$config_h_in_file");

    open(IN, "< $config_h_in_file");
    local $/ = "\n";
    while(<IN>) {
	if(/^\#undef\s+(\S+)$/) {
	    $$conditionals{$1}++;
	}
    }
    close(IN);

    return $self;
}

sub is_function {
    my $self = shift;
    my $functions = \%{$self->{FUNCTIONS}};

    my $name = shift;

    return $$functions{$name};
}

sub is_conditional {
    my $self = shift;
    my $conditionals = \%{$self->{CONDITIONALS}};

    my $name = shift;

    return $$conditionals{$name};
}

sub is_conditional_header {
    my $self = shift;
    my $conditional_headers = \%{$self->{CONDITIONAL_HEADERS}};

    my $name = shift;

    return $$conditional_headers{$name};
}

sub is_conditional_function {
    my $self = shift;
    my $conditional_functions = \%{$self->{CONDITIONAL_FUNCTIONS}};

    my $name = shift;

    return $$conditional_functions{$name};
}

1;