1 files changed, 241 insertions, 0 deletions
diff --git a/src/config/File.cxx b/src/config/File.cxx
new file mode 100644
index 000000000..03aca6e26
--- /dev/null
+++ b/src/config/File.cxx
@@ -0,0 +1,241 @@
+/*
+ * 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);
+}