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#include "config_parse.hpp"
// config_parse.cpp - Framework for per-server config parsers.
//
// Copyright © 2014 Ben Longbons <b.r.longbons@gmail.com>
//
// This file is part of The Mana World (Athena server)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <algorithm>
#include "../strings/xstring.hpp"
#include "../strings/zstring.hpp"
#include "../compat/borrow.hpp"
#include "../io/cxxstdio.hpp"
#include "../io/extract.hpp"
#include "../io/line.hpp"
#include "version.hpp"
#include "../poison.hpp"
namespace tmwa
{
bool is_comment(XString line)
{
return not line or line.startswith("//"_s);
}
template<class ZS>
static
bool do_split(io::Spanned<ZS> line, io::Spanned<XString> *key, io::Spanned<ZS> *value)
{
typename ZS::iterator colon = std::find(line.data.begin(), line.data.end(), ':');
if (colon == line.data.end())
return false;
key->data = line.data.xislice_h(colon);
key->span = line.span;
key->span.end.column = key->span.begin.column + key->data.size() - 1;
++colon;
value->data = line.data.xislice_t(colon);
value->span = line.span;
value->span.begin.column = value->span.end.column - value->data.size() + 1;
return true;
}
template<class ZS>
static
io::Spanned<ZS> do_lstrip(io::Spanned<ZS> value)
{
io::Spanned<ZS> rv;
rv.data = value.data.lstrip();
rv.span = value.span;
rv.span.begin.column += (value.data.size() - rv.data.size());
return rv;
}
static
io::Spanned<XString> do_rstrip(io::Spanned<XString> value)
{
io::Spanned<XString> rv;
rv.data = value.data.rstrip();
rv.span = value.span;
rv.span.end.column -= (value.data.size() - rv.data.size());
return rv;
}
static
io::Spanned<XString> do_strip(io::Spanned<XString> value)
{
return do_lstrip(do_rstrip(value));
}
template<class ZS>
inline
bool config_split_impl(io::Spanned<ZS> line, io::Spanned<XString> *key, io::Spanned<ZS> *value)
{
// unconditionally fail if line contains control characters
if (std::find_if(line.data.begin(), line.data.end(),
[](unsigned char c) { return c < ' '; }
) != line.data.end())
return false;
if (!do_split(line, key, value))
return false;
*key = do_strip(*key);
*value = do_lstrip(*value);
return true;
}
// eventually this should go away
// currently the only real offenders are io::FD::open and *PRINTF
bool config_split(io::Spanned<ZString> line, io::Spanned<XString> *key, io::Spanned<ZString> *value)
{
return config_split_impl(line, key, value);
}
static
bool check_version(io::Spanned<XString> avers, Borrowed<bool> valid)
{
enum
{
GE, LE, GT, LT
} cmp;
if (avers.data.startswith(">="_s))
{
cmp = GE;
avers.data = avers.data.xslice_t(2);
avers.span.begin.column += 2;
}
else if (avers.data.startswith('>'))
{
cmp = GT;
avers.data = avers.data.xslice_t(1);
avers.span.begin.column += 1;
}
else if (avers.data.startswith("<="_s))
{
cmp = LE;
avers.data = avers.data.xslice_t(2);
avers.span.begin.column += 2;
}
else if (avers.data.startswith('<'))
{
cmp = LT;
avers.data = avers.data.xslice_t(1);
avers.span.begin.column += 1;
}
else
{
avers.span.error("Version check must begin with one of: '>=', '>', '<=', '<'"_s);
*valid = false;
return false;
}
Version vers;
if (!extract(avers.data, &vers))
{
avers.span.error("Bad value"_s);
*valid = false;
return false;
}
switch (cmp)
{
case GE:
return CURRENT_VERSION >= vers;
case GT:
return CURRENT_VERSION > vers;
case LE:
return CURRENT_VERSION <= vers;
case LT:
return CURRENT_VERSION < vers;
}
abort();
}
/// Master config parser. This handles 'import' and 'version-ge' etc.
/// Then it defers to the inferior parser for a line it does not understand.
///
/// Note: old-style 'version-ge: 1.2.3' etc apply to the rest of the file, but
/// new-style 'version: >= 1.2.3' apply only up to the next 'version:'
bool load_config_file(ZString filename, ConfigItemParser slave)
{
io::LineReader in(filename);
if (!in.is_open())
{
PRINTF("Unable to open file: %s\n"_fmt, filename);
return false;
}
io::Line line_;
bool rv = true;
bool good_version = true;
while (in.read_line(line_))
{
if (is_comment(line_.text))
continue;
auto line = io::respan(line_.to_span(), ZString(line_.text));
io::Spanned<XString> key;
io::Spanned<ZString> value;
if (!config_split(line, &key, &value))
{
line.span.error("Bad config line"_s);
rv = false;
continue;
}
if (key.data == "version"_s)
{
if (value.data == "all"_s)
{
good_version = true;
}
else
{
good_version = true;
while (good_version && value.data)
{
ZString::iterator it = std::find(value.data.begin(), value.data.end(), ' ');
io::Spanned<XString> value_head;
value_head.data = value.data.xislice_h(it);
value_head.span = value.span;
value.data = value.data.xislice_t(it).lstrip();
value_head.span.end.column = value_head.span.begin.column + value_head.data.size() - 1;
value.span.begin.column = value.span.end.column - value.data.size() + 1;
good_version &= check_version(value_head, borrow(rv));
}
}
continue;
}
if (!good_version)
{
continue;
}
if (key.data == "import"_s)
{
if (!load_config_file(value.data, slave))
{
value.span.error("Failed to include file"_s);
rv = false;
}
continue;
}
else if (key.data == "version-lt"_s)
{
Version vers;
if (!extract(value.data, &vers))
{
value.span.error("Bad value"_s);
rv = false;
continue;
}
if (CURRENT_VERSION < vers)
continue;
break;
}
else if (key.data == "version-le"_s)
{
Version vers;
if (!extract(value.data, &vers))
{
rv = false;
value.span.error("Bad value"_s);
continue;
}
if (CURRENT_VERSION <= vers)
continue;
break;
}
else if (key.data == "version-gt"_s)
{
Version vers;
if (!extract(value.data, &vers))
{
rv = false;
value.span.error("Bad value"_s);
continue;
}
if (CURRENT_VERSION > vers)
continue;
break;
}
else if (key.data == "version-ge"_s)
{
Version vers;
if (!extract(value.data, &vers))
{
rv = false;
value.span.error("Bad value"_s);
continue;
}
if (CURRENT_VERSION >= vers)
continue;
break;
}
else
{
rv &= slave(key, value);
}
// nothing to see here, move along
}
return rv;
}
} // namespace tmwa
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