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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "types.h"
#include <vespa/vespalib/util/stringfmt.h>
#include <set>
#include <cerrno>
namespace config {
/**
* To reduce the need for code in autogenerated config classes, these
* helper functions exist to help parsing.
*/
class ConfigParser {
public:
class Cfg {
public:
Cfg(const std::vector<vespalib::string> & v)
: _cfg(v.empty() ? nullptr : &v[0]),
_sz(v.size())
{ }
Cfg(const std::vector<vespalib::string, vespalib::allocator_large<vespalib::string>> & v) :
_cfg(v.empty() ? nullptr : &v[0]),
_sz(v.size())
{ }
size_t size() const noexcept { return _sz; }
const vespalib::string & operator[] (size_t idx) const noexcept {
return _cfg[idx];
}
private:
const vespalib::string * _cfg;
size_t _sz;
};
private:
static StringVector getLinesForKey(vespalib::stringref key, Cfg config);
static std::vector<StringVector> splitArray(Cfg config);
static std::map<vespalib::string, StringVector> splitMap(Cfg config);
static vespalib::string deQuote(const vespalib::string & source);
static void throwNoDefaultValue(vespalib::stringref key);
template<typename T>
static T convert(const StringVector & config);
static vespalib::string arrayToString(Cfg config);
template<typename T>
static T parseInternal(vespalib::stringref key, Cfg config);
template<typename T>
static T parseInternal(vespalib::stringref key, Cfg config, T defaultValue);
template<typename V>
static V parseArrayInternal(vespalib::stringref key, Cfg config);
template<typename T>
static std::map<vespalib::string, T> parseMapInternal(vespalib::stringref key, Cfg config);
template<typename T>
static T parseStructInternal(vespalib::stringref key, Cfg config);
public:
static void stripLinesForKey(vespalib::stringref key, std::set<vespalib::string>& config);
static std::set<vespalib::string> getUniqueNonWhiteSpaceLines(Cfg config);
static vespalib::string stripWhitespace(vespalib::stringref source);
template<typename T>
static T parse(vespalib::stringref key, Cfg config) {
return parseInternal<T>(key, config);
}
template<typename T>
static T parse(vespalib::stringref key, Cfg config, T defaultValue) {
return parseInternal(key, config, defaultValue);
}
template<typename V>
static V parseArray(vespalib::stringref key, Cfg config) {
return parseArrayInternal<V>(key, config);
}
template<typename T>
static std::map<vespalib::string, T> parseMap(vespalib::stringref key, Cfg config) {
return parseMapInternal<T>(key, config);
}
template<typename T>
static T parseStruct(vespalib::stringref key, Cfg config) {
return parseStructInternal<T>(key, config);
}
};
template<typename T>
T
ConfigParser::parseInternal(vespalib::stringref key, Cfg config)
{
StringVector lines = getLinesForKey(key, config);
if (lines.size() == 0) {
throwNoDefaultValue(key);
}
return convert<T>(lines);
}
template<typename T>
T
ConfigParser::parseInternal(vespalib::stringref key, Cfg config, T defaultValue)
{
StringVector lines = getLinesForKey(key, config);
if (lines.size() == 0) {
return defaultValue;
}
return convert<T>(lines);
}
template<typename T>
T
ConfigParser::convert(const StringVector & lines) {
return T(lines);
}
template<typename T>
std::map<vespalib::string, T>
ConfigParser::parseMapInternal(vespalib::stringref key, Cfg config)
{
StringVector lines = getLinesForKey(key, config);
using SplittedMap = std::map<vespalib::string, StringVector>;
SplittedMap s = splitMap(lines);
std::map<vespalib::string, T> retval;
for (const auto & e : s) {
retval[e.first] = convert<T>(e.second);
}
return retval;
}
template<typename V>
V
ConfigParser::parseArrayInternal(vespalib::stringref key, Cfg config)
{
StringVector lines = getLinesForKey(key, config);
std::vector<StringVector> split = splitArray(lines);
V retval;
retval.reserve(split.size());
for (uint32_t i = 0; i < split.size(); i++) {
retval.push_back(convert<typename V::value_type>(split[i]));
}
return retval;
}
template<typename T>
T
ConfigParser::parseStructInternal(vespalib::stringref key, Cfg config)
{
StringVector lines = getLinesForKey(key, config);
return convert<T>(lines);
}
template<>
bool
ConfigParser::convert<bool>(const StringVector & config);
template<>
int32_t
ConfigParser::convert<int32_t>(const StringVector & config);
template<>
int64_t
ConfigParser::convert<int64_t>(const StringVector & config);
template<>
double
ConfigParser::convert<double>(const StringVector & config);
template<>
vespalib::string
ConfigParser::convert<vespalib::string>(const StringVector & config);
} // config
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