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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.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 "config.h"
#include "File.hxx"
#include "Data.hxx"
#include "Param.hxx"
#include "Block.hxx"
#include "Templates.hxx"
#include "util/Tokenizer.hxx"
#include "util/StringStrip.hxx"
#include "util/Domain.hxx"
#include "util/RuntimeError.hxx"
#include "fs/Path.hxx"
#include "fs/io/FileReader.hxx"
#include "fs/io/BufferedReader.hxx"
#include "Log.hxx"
#include <memory>
#include <assert.h>
static constexpr char CONF_COMMENT = '#';
static constexpr Domain config_file_domain("config_file");
static void
config_read_name_value(ConfigBlock &block, char *input, unsigned line)
{
Tokenizer tokenizer(input);
const char *name = tokenizer.NextWord();
assert(name != nullptr);
const char *value = tokenizer.NextString();
if (value == nullptr)
throw std::runtime_error("Value missing");
if (!tokenizer.IsEnd() && tokenizer.CurrentChar() != CONF_COMMENT)
throw std::runtime_error("Unknown tokens after value");
const BlockParam *bp = block.GetBlockParam(name);
if (bp != nullptr)
throw FormatRuntimeError("\"%s\" is duplicate, first defined on line %i",
name, bp->line);
block.AddBlockParam(name, value, line);
}
static ConfigBlock *
config_read_block(BufferedReader &reader)
try {
std::unique_ptr<ConfigBlock> block(new ConfigBlock(reader.GetLineNumber()));
while (true) {
char *line = reader.ReadLine();
if (line == nullptr)
throw std::runtime_error("Expected '}' before end-of-file");
line = StripLeft(line);
if (*line == 0 || *line == CONF_COMMENT)
continue;
if (*line == '}') {
/* end of this block; return from the function
(and from this "while" loop) */
line = StripLeft(line + 1);
if (*line != 0 && *line != CONF_COMMENT)
throw std::runtime_error("Unknown tokens after '}'");
return block.release();
}
/* parse name and value */
config_read_name_value(*block, line,
reader.GetLineNumber());
}
} catch (...) {
std::throw_with_nested(FormatRuntimeError("Error in line %u", reader.GetLineNumber()));
}
gcc_nonnull_all
static void
Append(ConfigBlock *&head, ConfigBlock *p)
{
assert(p->next == nullptr);
auto **i = &head;
while (*i != nullptr)
i = &(*i)->next;
*i = p;
}
static void
ReadConfigBlock(ConfigData &config_data, BufferedReader &reader,
const char *name, ConfigBlockOption o,
Tokenizer &tokenizer)
{
const unsigned i = unsigned(o);
const ConfigTemplate &option = config_block_templates[i];
ConfigBlock *&head = config_data.blocks[i];
if (head != nullptr && !option.repeatable) {
ConfigBlock *block = head;
throw FormatRuntimeError("config parameter \"%s\" is first defined "
"on line %d and redefined on line %u\n",
name, block->line,
reader.GetLineNumber());
}
/* now parse the block or the value */
if (tokenizer.CurrentChar() != '{')
throw FormatRuntimeError("line %u: '{' expected",
reader.GetLineNumber());
char *line = StripLeft(tokenizer.Rest() + 1);
if (*line != 0 && *line != CONF_COMMENT)
throw FormatRuntimeError("line %u: Unknown tokens after '{'",
reader.GetLineNumber());
auto *param = config_read_block(reader);
assert(param != nullptr);
Append(head, param);
}
gcc_nonnull_all
static void
Append(ConfigParam *&head, ConfigParam *p)
{
assert(p->next == nullptr);
auto **i = &head;
while (*i != nullptr)
i = &(*i)->next;
*i = p;
}
static void
ReadConfigParam(ConfigData &config_data, BufferedReader &reader,
const char *name, ConfigOption o,
Tokenizer &tokenizer)
{
const unsigned i = unsigned(o);
const ConfigTemplate &option = config_param_templates[i];
auto *&head = config_data.params[i];
if (head != nullptr && !option.repeatable) {
auto *param = head;
throw FormatRuntimeError("config parameter \"%s\" is first defined "
"on line %d and redefined on line %u\n",
name, param->line,
reader.GetLineNumber());
}
/* now parse the block or the value */
const char *value = tokenizer.NextString();
if (value == nullptr)
throw FormatRuntimeError("line %u: Value missing",
reader.GetLineNumber());
if (!tokenizer.IsEnd() && tokenizer.CurrentChar() != CONF_COMMENT)
throw FormatRuntimeError("line %u: Unknown tokens after value",
reader.GetLineNumber());
auto *param = new ConfigParam(value, reader.GetLineNumber());
Append(head, param);
}
static void
ReadConfigFile(ConfigData &config_data, BufferedReader &reader)
{
while (true) {
char *line = reader.ReadLine();
if (line == nullptr)
return;
line = StripLeft(line);
if (*line == 0 || *line == CONF_COMMENT)
continue;
/* the first token in each line is the name, followed
by either the value or '{' */
Tokenizer tokenizer(line);
const char *name = tokenizer.NextWord();
assert(name != nullptr);
/* get the definition of that option, and check the
"repeatable" flag */
const ConfigOption o = ParseConfigOptionName(name);
ConfigBlockOption bo;
if (o != ConfigOption::MAX) {
ReadConfigParam(config_data, reader, name, o,
tokenizer);
} else if ((bo = ParseConfigBlockOptionName(name)) != ConfigBlockOption::MAX) {
ReadConfigBlock(config_data, reader, name, bo,
tokenizer);
} else {
throw FormatRuntimeError("unrecognized parameter in config file at "
"line %u: %s\n",
reader.GetLineNumber(), name);
}
}
}
void
ReadConfigFile(ConfigData &config_data, Path path)
{
assert(!path.IsNull());
const std::string path_utf8 = path.ToUTF8();
FormatDebug(config_file_domain, "loading file %s", path_utf8.c_str());
FileReader file(path);
BufferedReader reader(file);
ReadConfigFile(config_data, reader);
}
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