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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/stringfmt.h>
#include <map>
#include <set>
#include <vector>
#include <cerrno>
#include <cstdint>
namespace config {
/**
* To reduce the need for code in autogenerated config classes, these
* helper functions exist to help parsing.
*/
class ConfigParser {
public:
typedef std::vector<vespalib::string> vsvector;
private:
static vsvector getLinesForKey( const vespalib::stringref & key, const vsvector & config);
static std::vector<vsvector> splitArray( const vsvector & config);
static std::map<vespalib::string, vsvector> splitMap( const vsvector & config);
static vespalib::string deQuote(const vespalib::string & source);
static void throwNoDefaultValue(const vespalib::stringref & key);
template<typename T>
static T convert(const vsvector &);
static vespalib::string arrayToString(const vsvector &);
template<typename T, typename V>
static T parseInternal(const vespalib::stringref & key, const V & config);
template<typename T, typename V>
static T parseInternal(const vespalib::stringref & key, const V & config, T defaultValue);
template<typename T, typename V>
static std::vector<T> parseArrayInternal(const vespalib::stringref & key, const V & config);
template<typename T, typename V>
static std::map<vespalib::string, T> parseMapInternal(const vespalib::stringref & key, const V & config);
template<typename T, typename V>
static T parseStructInternal(const vespalib::stringref & key, const V & config);
public:
static void stripLinesForKey(const vespalib::stringref & key,
std::set<vespalib::string>& config);
static vespalib::string stripWhitespace(const vespalib::stringref & source);
template<typename T>
static T parse(const vespalib::stringref & key, const vsvector & config) {
return parseInternal<T, vsvector>(key, config);
}
template<typename T>
static T parse(const vespalib::stringref & key, const vsvector & config, T defaultValue) {
return parseInternal(key, config, defaultValue);
}
template<typename T>
static std::vector<T> parseArray(const vespalib::stringref & key, const vsvector & config) {
return parseArrayInternal<T, vsvector>(key, config);
}
template<typename T>
static std::map<vespalib::string, T> parseMap(const vespalib::stringref & key, const vsvector & config) {
return parseMapInternal<T, vsvector>(key, config);
}
template<typename T>
static T parseStruct(const vespalib::stringref & key, const vsvector & config) {
return parseStructInternal<T, vsvector>(key, config);
}
};
template<typename T, typename V>
T
ConfigParser::parseInternal(const vespalib::stringref & key, const V & config)
{
V lines = getLinesForKey(key, config);
if (lines.size() == 0) {
throwNoDefaultValue(key);
}
return convert<T>(lines);
}
template<typename T, typename V>
T
ConfigParser::parseInternal(const vespalib::stringref & key, const V & config, T defaultValue)
{
V lines = getLinesForKey(key, config);
if (lines.size() == 0) {
return defaultValue;
}
return convert<T>(lines);
}
template<typename T>
T
ConfigParser::convert(const vsvector & lines) {
return T(lines);
}
template<typename T, typename V>
std::map<vespalib::string, T>
ConfigParser::parseMapInternal(const vespalib::stringref & key, const V & config)
{
V lines = getLinesForKey(key, config);
typedef std::map<vespalib::string, V> SplittedMap;
SplittedMap s = splitMap(lines);
std::map<vespalib::string, T> retval;
for (typename SplittedMap::iterator it(s.begin()), mt(s.end()); it != mt; it++) {
retval[it->first] = convert<T>(it->second);
}
return retval;
}
template<typename T, typename V>
std::vector<T>
ConfigParser::parseArrayInternal(const vespalib::stringref & key, const V & config)
{
V lines = getLinesForKey(key, config);
std::vector<V> split = splitArray(lines);
std::vector<T> retval;
for (uint32_t i = 0; i < split.size(); i++) {
retval.push_back(convert<T>(split[i]));
}
return retval;
}
template<typename T, typename V>
T
ConfigParser::parseStructInternal(const vespalib::stringref & key, const V & config)
{
V lines = getLinesForKey(key, config);
return convert<T>(lines);
}
template<>
bool
ConfigParser::convert<bool>(const vsvector & config);
template<>
int32_t
ConfigParser::convert<int32_t>(const vsvector & config);
template<>
int64_t
ConfigParser::convert<int64_t>(const vsvector & config);
template<>
double
ConfigParser::convert<double>(const vsvector & config);
template<>
vespalib::string
ConfigParser::convert<vespalib::string>(const vsvector & config);
} // config
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