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/* mpdscribble (MPD Client)
* Copyright (C) 2008-2019 The Music Player Daemon Project
* Project homepage: http://musicpd.org
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "IniFile.hxx"
#include "system/Error.hxx"
#include "util/CharUtil.hxx"
#include "util/RuntimeError.hxx"
#include "util/ScopeExit.hxx"
#include "util/StringStrip.hxx"
#include "util/StringView.hxx"
#include <stdio.h>
static constexpr bool
IsValidSectionNameChar(char ch) noexcept
{
return IsAlphaNumericASCII(ch) || ch == '_' || ch == '-' || ch == '.';
}
[[gnu::pure]]
static bool
IsValidSectionName(StringView name) noexcept
{
if (name.empty())
return false;
for (char ch : name)
if (!IsValidSectionNameChar(ch))
return false;
return true;
}
static constexpr bool
IsValidKeyChar(char ch) noexcept
{
return IsAlphaNumericASCII(ch) || ch == '_';
}
[[gnu::pure]]
static bool
IsValidKey(StringView name) noexcept
{
if (name.empty())
return false;
for (char ch : name)
if (!IsValidKeyChar(ch))
return false;
return true;
}
namespace {
class IniParser {
IniFile data;
IniFile::iterator section;
public:
void ParseLine(char *line);
auto Commit() noexcept {
return std::move(data);
}
};
void
IniParser::ParseLine(char *line)
{
line = Strip(line);
if (*line == 0 || *line == '#')
/* ignore empty lines and comments */
return;
if (*line == '[') {
/* a new section */
line = StripLeft(line + 1);
char *end = strchr(line, ']');
if (end == nullptr)
throw std::runtime_error("Missing ']'");
StringView name(line, end);
name.StripRight();
if (!IsValidSectionName(name))
throw std::runtime_error("Invalid section name");
line = end + 1;
if (*line != 0)
throw std::runtime_error("Garbage after section");
auto i = data.emplace(std::string(name.data, name.size),
IniSection());
if (!i.second)
throw FormatRuntimeError("Duplicate section name: %.*s",
int(name.size), name.data);
section = i.first;
} else if (IsValidKeyChar(*line)) {
char *eq = strchr(line, '=');
if (eq == nullptr)
throw std::runtime_error("Missing '='");
StringView key(line, eq);
key.StripRight();
if (!IsValidKey(key))
throw std::runtime_error("Invalid key");
StringView value(eq + 1);
value.StripLeft();
// TODO: support quoted values
if (data.empty())
section = data.emplace(std::string(),
IniSection()).first;
auto i = section->second.emplace(std::string(key.data, key.size),
std::string(value.data, value.size));
if (!i.second)
throw FormatRuntimeError("Duplicate key: %.*s",
int(key.size), key.data);
} else
throw std::runtime_error("Syntax error");
}
}
static IniFile
ReadIniFile(const char *path, FILE *file)
{
IniParser parser;
unsigned no = 1;
char buffer[4096];
while (auto line = fgets(buffer, sizeof(buffer), file)) {
try {
parser.ParseLine(line);
} catch (...) {
std::throw_with_nested(FormatRuntimeError("Error on %s line %u",
path, no));
}
++no;
}
return parser.Commit();
}
IniFile
ReadIniFile(const char *path)
{
FILE *file = fopen(path, "r");
if (file == nullptr)
throw FormatErrno("Failed to open %s", path);
AtScopeExit(file) { fclose(file); };
return ReadIniFile(path, file);
}
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