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// file : bpkg/manifest-serializer.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <bpkg/manifest-serializer>
#include <ostream>
#include <cassert>
using namespace std;
namespace bpkg
{
using serialization = manifest_serialization;
void manifest_serializer::
next (const string& n, const string& v)
{
switch (s_)
{
case start:
{
if (!n.empty ())
throw serialization (name_, "format version pair expected");
if (v.empty ())
{
// End of manifests.
//
os_.flush ();
s_ = end;
break;
}
if (v != "1")
throw serialization (name_, "unsupported format version " + v);
os_ << ':';
if (v != version_)
{
os_ << ' ' << v;
version_ = v;
}
os_ << endl;
s_ = body;
break;
}
case body:
{
if (n.empty ())
{
if (!v.empty ())
throw serialization (name_, "non-empty value in end pair");
s_ = start;
break;
}
check_name (n);
os_ << n << ':';
if (!v.empty ())
{
os_ << ' ';
// Use the multi-line mode in any of the following cases:
//
// - name is too long (say longer than 37 (78/2 - 2) characters;
// we cannot start on the next line since that would start the
// multi-line mode)
// - value contains newlines
// - value contains leading/trailing whitespaces
//
if (n.size () > 37 ||
v.find ('\n') != string::npos ||
v.front () == ' ' || v.front () == '\t' ||
v.back () == ' ' || v.back () == '\t')
{
os_ << "\\" << endl; // Multi-line mode introductor.
// Chunk the value into fragments separated by newlines.
//
for (size_t i (0), p (v.find ('\n')); ; p = v.find ('\n', i))
{
if (p == string::npos)
{
// Last chunk.
//
write_value (0, v.c_str () + i, v.size () - i);
break;
}
write_value (0, v.c_str () + i, p - i);
os_ << endl;
i = p + 1;
}
os_ << endl << "\\"; // Multi-line mode terminator.
}
else
write_value (n.size () + 2, v.c_str (), v.size ());
}
os_ << endl;
break;
}
case end:
{
throw serialization (name_, "serialization after eos");
}
}
}
void manifest_serializer::
comment (const string& t)
{
if (s_ == end)
throw serialization (name_, "serialization after eos");
os_ << '#';
if (!t.empty ())
os_ << ' ' << t;
os_ << endl;
}
void manifest_serializer::
check_name (const string& n)
{
if (n[0] == '#')
throw serialization (name_, "name starts with '#'");
for (char c: n)
{
switch (c)
{
case ' ':
case '\t':
case '\n': throw serialization (name_, "name contains whitespace");
case ':': throw serialization (name_, "name contains ':'");
default: break;
}
}
}
void manifest_serializer::
write_value (size_t cl, const char* s, size_t n)
{
char c ('\0');
// The idea is to break on the 77th character (i.e., write it
// on the next line) which means we have written 76 characters
// on this line plus 2 for '\' and '\n', which gives us 78.
//
for (const char* e (s + n); s != e; s++, cl++)
{
c = *s;
bool br (false); // Break the line.
// If this is a whitespace, see if it's a good place to break the
// line.
//
if (c == ' ' || c == '\t')
{
// Find the next whitespace (or the end) and see if it is a better
// place.
//
for (const char* w (s + 1); ; w++)
{
if (w == e || *w == ' ' || *w == '\t')
{
// Is this whitespace past where we need to break? Also see
// below the "hard" break case for why we use 78 at the end.
//
if (cl + static_cast<size_t> (w - s) > (w != e ? 77 : 78))
{
// Only break if this whitespace is close enough to
// the end of the line.
//
br = (cl > 57);
}
break;
}
}
}
// Do we have to do a "hard" break (i.e., without a whitespace)?
// If there is just one character left, then instead of writing
// '\' and then the character on the next line, we might as well
// write it on this line.
//
if (cl == (s + 1 != e ? 77 : 78))
br = true;
if (br)
{
os_ << '\\' << endl;
cl = 0;
}
os_ << c;
}
// What comes next is always a newline. I the last character that
// we have written is a backslash, escape it.
//
if (c == '\\')
os_ << '\\';
}
// manifest_serialization
//
static string
format (const string& n, const string& d)
{
string r;
if (!n.empty ())
{
r += n;
r += ": ";
}
r += "error: ";
r += d;
return r;
}
manifest_serialization::
manifest_serialization (const string& n, const string& d)
: runtime_error (format (n, d)), name (n), description (d)
{
}
}
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