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// file : libbutl/manifest.cxx
// license : MIT; see accompanying LICENSE file
#include <ios> // ios::failure, ios::*bit
#include <string>
#include <cassert>
#include <cstddef> // size_t
#include <iostream>
#include <stdexcept> // invalid_argument
#include <libbutl/utility.mxx>
#include <libbutl/fdstream.mxx>
#include <libbutl/manifest-parser.mxx>
#include <libbutl/manifest-serializer.mxx>
using namespace std;
using namespace butl;
// Set the binary translation mode for stdout. Throw ios::failure on error.
// Noop on POSIX.
//
// Note that it makes sense to set the binary mode for stdout not to litter
// the resulting manifest representation with the carriage return characters
// on Windows.
//
static void
stdout_binary ()
{
try
{
stdout_fdmode (fdstream_mode::binary);
}
catch (const invalid_argument&)
{
assert (false); // No reason to happen.
}
}
static int
cmd_parse ()
{
using parser = manifest_parser;
using parsing = manifest_parsing;
using name_value = manifest_name_value;
// Parse the manifest list and write its binary representation.
//
try
{
stdout_binary ();
cin.exceptions (ios::badbit | ios::failbit);
cout.exceptions (ios::badbit | ios::failbit);
parser p (cin, "stdin");
// Iterate over manifests in the list.
//
for (name_value nv (p.next ()); !nv.empty (); nv = p.next ())
{
// Iterate over manifest name/values.
//
for (; !nv.empty (); nv = p.next ())
cout << nv.name << ':' << nv.value << '\0' << flush;
}
}
catch (const parsing& e)
{
cerr << e << endl;
return 1;
}
catch (const ios::failure& e)
{
cerr << "error: unable to read from stdin or write to stdout: " << e
<< endl;
return 1;
}
return 0;
}
static int
cmd_serialize (bool long_lines)
{
using serializer = manifest_serializer;
using serialization = manifest_serialization;
try
{
stdout_binary ();
// Don't throw when failbit is set (getline() failed to extract any
// characters).
//
cin.exceptions (ios::badbit);
cout.exceptions (ios::badbit | ios::failbit);
serializer s (cout, "stdout", long_lines);
for (string l; !eof (getline (cin, l, '\0')); )
{
size_t p (l.find (':'));
if (p == string::npos)
throw serialization (s.name (), "':' expected after name");
string n (l, 0, p);
string v (l, p + 1);
// Validates the name. Expects the first pair to be the format version.
// Ends current and starts next manifest for the start-of-manifest pair.
//
s.next (n, v);
}
s.next ("", ""); // End of manifest list.
}
catch (const serialization& e)
{
cerr << e << endl;
return 1;
}
catch (const ios::failure& e)
{
cerr << "error: unable to read from stdin or write to stdout: " << e
<< endl;
return 1;
}
return 0;
}
// Usages:
//
// argv[0] parse
// argv[0] [--long-lines] serialize
//
int
main (int argc, char* argv[])
{
// We should switch to CLI if we need anything more elaborate.
//
int i (1);
bool long_lines (false);
for (; i != argc; ++i)
{
string op (argv[i]);
if (op == "--long-lines")
long_lines = true;
else
break;
}
if (i == argc)
{
cerr << "error: missing command" << endl;
return 1;
}
string c (argv[i]);
if (c == "parse") return cmd_parse ();
if (c == "serialize") return cmd_serialize (long_lines);
cerr << "error: unknown command '" << c << "'" << endl;
return 1;
}
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