config/Global: move value parser code to struct ConfigData

src/config/Data.cxx

@@ -21,9 +21,13 @@
 #include "Data.hxx"
 #include "Param.hxx"
 #include "Block.hxx"
+#include "Parser.hxx"
+#include "fs/AllocatedPath.hxx"
 #include "util/RuntimeError.hxx"
 #include "util/StringAPI.hxx"
 
+#include <stdlib.h>
+
 void
 ConfigData::Clear()
 {
@@ -38,6 +42,87 @@ ConfigData::Clear()
 	}
 }
 
+const char *
+ConfigData::GetString(ConfigOption option,
+		      const char *default_value) const noexcept
+{
+	const auto *param = GetParam(option);
+	if (param == nullptr)
+		return default_value;
+
+	return param->value.c_str();
+}
+
+AllocatedPath
+ConfigData::GetPath(ConfigOption option) const
+{
+	const auto *param = GetParam(option);
+	if (param == nullptr)
+		return nullptr;
+
+	return param->GetPath();
+}
+
+unsigned
+ConfigData::GetUnsigned(ConfigOption option, unsigned default_value) const
+{
+	const auto *param = GetParam(option);
+	long value;
+	char *endptr;
+
+	if (param == nullptr)
+		return default_value;
+
+	const char *const s = param->value.c_str();
+	value = strtol(s, &endptr, 0);
+	if (endptr == s || *endptr != 0 || value < 0)
+		throw FormatRuntimeError("Not a valid non-negative number in line %i",
+					 param->line);
+
+	return (unsigned)value;
+}
+
+unsigned
+ConfigData::GetPositive(ConfigOption option, unsigned default_value) const
+{
+	const auto *param = GetParam(option);
+	long value;
+	char *endptr;
+
+	if (param == nullptr)
+		return default_value;
+
+	const char *const s = param->value.c_str();
+	value = strtol(s, &endptr, 0);
+	if (endptr == s || *endptr != 0)
+		throw FormatRuntimeError("Not a valid number in line %i",
+					 param->line);
+
+	if (value <= 0)
+		throw FormatRuntimeError("Not a positive number in line %i",
+					 param->line);
+
+	return (unsigned)value;
+}
+
+bool
+ConfigData::GetBool(ConfigOption option, bool default_value) const
+{
+	const auto *param = GetParam(option);
+	bool success, value;
+
+	if (param == nullptr)
+		return default_value;
+
+	success = get_bool(param->value.c_str(), &value);
+	if (!success)
+		throw FormatRuntimeError("Expected boolean value (yes, true, 1) or "
+					 "(no, false, 0) on line %i\n",
+					 param->line);
+
+	return value;
+}
+
 const ConfigBlock *
 ConfigData::FindBlock(ConfigBlockOption option,
 		      const char *key, const char *value) const

src/config/Data.hxx

@@ -26,6 +26,7 @@
 
 struct ConfigParam;
 struct ConfigBlock;
+class AllocatedPath;
 
 struct ConfigData {
 	std::array<ConfigParam *, std::size_t(ConfigOption::MAX)> params{{nullptr}};
@@ -39,6 +40,27 @@ struct ConfigData {
 	}
 
 	gcc_pure
+	const char *GetString(ConfigOption option,
+			      const char *default_value=nullptr) const noexcept;
+
+	/**
+	 * Returns an optional configuration variable which contains an
+	 * absolute path.  If there is a tilde prefix, it is expanded.
+	 * Returns nullptr if the value is not present.
+	 *
+	 * Throws #std::runtime_error on error.
+	 */
+	AllocatedPath GetPath(ConfigOption option) const;
+
+	unsigned GetUnsigned(ConfigOption option,
+			     unsigned default_value) const;
+
+	unsigned GetPositive(ConfigOption option,
+			     unsigned default_value) const;
+
+	bool GetBool(ConfigOption option, bool default_value) const;
+
+	gcc_pure
 	const ConfigBlock *GetBlock(ConfigBlockOption option) const noexcept {
 		return blocks[size_t(option)];
 	}

src/config/Global.cxx

@@ -19,7 +19,6 @@
 
 #include "config.h"
 #include "Global.hxx"
-#include "Parser.hxx"
 #include "Data.hxx"
 #include "Param.hxx"
 #include "Block.hxx"
@@ -31,8 +30,6 @@
 #include "util/RuntimeError.hxx"
 #include "Log.hxx"
 
-#include <stdlib.h>
-
 static ConfigData config_data;
 
 void config_global_finish(void)
@@ -95,80 +92,29 @@ config_get_block(ConfigBlockOption option) noexcept
 const char *
 config_get_string(ConfigOption option, const char *default_value) noexcept
 {
-	const auto *param = config_get_param(option);
-
-	if (param == nullptr)
-		return default_value;
-
-	return param->value.c_str();
+	return config_data.GetString(option, default_value);
 }
 
 AllocatedPath
 config_get_path(ConfigOption option)
 {
-	const auto *param = config_get_param(option);
-	if (param == nullptr)
-		return nullptr;
-
-	return param->GetPath();
+	return config_data.GetPath(option);
 }
 
 unsigned
 config_get_unsigned(ConfigOption option, unsigned default_value)
 {
-	const auto *param = config_get_param(option);
-	long value;
-	char *endptr;
-
-	if (param == nullptr)
-		return default_value;
-
-	const char *const s = param->value.c_str();
-	value = strtol(s, &endptr, 0);
-	if (endptr == s || *endptr != 0 || value < 0)
-		throw FormatRuntimeError("Not a valid non-negative number in line %i",
-					 param->line);
-
-	return (unsigned)value;
+	return config_data.GetUnsigned(option, default_value);
 }
 
 unsigned
 config_get_positive(ConfigOption option, unsigned default_value)
 {
-	const auto *param = config_get_param(option);
-	long value;
-	char *endptr;
-
-	if (param == nullptr)
-		return default_value;
-
-	const char *const s = param->value.c_str();
-	value = strtol(s, &endptr, 0);
-	if (endptr == s || *endptr != 0)
-		throw FormatRuntimeError("Not a valid number in line %i",
-					 param->line);
-
-	if (value <= 0)
-		throw FormatRuntimeError("Not a positive number in line %i",
-					 param->line);
-
-	return (unsigned)value;
+	return config_data.GetPositive(option, default_value);
 }
 
 bool
 config_get_bool(ConfigOption option, bool default_value)
 {
-	const auto *param = config_get_param(option);
-	bool success, value;
-
-	if (param == nullptr)
-		return default_value;
-
-	success = get_bool(param->value.c_str(), &value);
-	if (!success)
-		throw FormatRuntimeError("Expected boolean value (yes, true, 1) or "
-					 "(no, false, 0) on line %i\n",
-					 param->line);
-
-	return value;
+	return config_data.GetBool(option, default_value);
 }