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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2013 Cloudwatt <libre.licensing@cloudwatt.com>
*
* Author: Loic Dachary <loic@dachary.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
*/
#include "include/str_map.h"
#include "include/str_list.h"
#include <boost/algorithm/string.hpp>
#include "json_spirit/json_spirit.h"
using namespace std;
int get_json_str_map(
const string &str,
ostream &ss,
str_map_t *str_map,
bool fallback_to_plain)
{
json_spirit::mValue json;
try {
// try json parsing first
json_spirit::read_or_throw(str, json);
if (json.type() != json_spirit::obj_type) {
ss << str << " must be a JSON object but is of type "
<< json.type() << " instead";
return -EINVAL;
}
json_spirit::mObject o = json.get_obj();
for (map<string, json_spirit::mValue>::iterator i = o.begin();
i != o.end();
++i) {
(*str_map)[i->first] = i->second.get_str();
}
} catch (json_spirit::Error_position &e) {
if (fallback_to_plain) {
// fallback to key=value format
get_str_map(str, str_map, "\t\n ");
} else {
return -EINVAL;
}
}
return 0;
}
static std::string_view trim(std::string_view str)
{
static const char* whitespaces = "\t\n ";
auto beg = str.find_first_not_of(whitespaces);
if (beg == str.npos) {
return {};
}
auto end = str.find_last_not_of(whitespaces);
return str.substr(beg, end - beg + 1);
}
int get_str_map(
const string &str,
str_map_t* str_map,
const char *delims)
{
for_each_pair(str, delims, [str_map](std::string_view key,
std::string_view val) {
// is the format 'K=V' or just 'K'?
if (val.empty()) {
str_map->emplace(std::string(key), "");
} else {
str_map->emplace(std::string(trim(key)), std::string(trim(val)));
}
});
return 0;
}
str_map_t get_str_map(
const string& str,
const char* delim)
{
str_map_t str_map;
get_str_map(str, &str_map, delim);
return str_map;
}
string get_str_map_value(
const str_map_t &str_map,
const string &key,
const string *def_val)
{
auto p = str_map.find(key);
// key exists in str_map
if (p != str_map.end()) {
// but value is empty
if (p->second.empty())
return p->first;
// and value is not empty
return p->second;
}
// key DNE in str_map and def_val was specified
if (def_val != nullptr)
return *def_val;
// key DNE in str_map, no def_val was specified
return string();
}
string get_str_map_key(
const str_map_t &str_map,
const string &key,
const string *fallback_key)
{
auto p = str_map.find(key);
if (p != str_map.end())
return p->second;
if (fallback_key != nullptr) {
p = str_map.find(*fallback_key);
if (p != str_map.end())
return p->second;
}
return string();
}
// This function's only purpose is to check whether a given map has only
// ONE key with an empty value (which would mean that 'get_str_map()' read
// a map in the form of 'VALUE', without any KEY/VALUE pairs) and, in such
// event, to assign said 'VALUE' to a given 'def_key', such that we end up
// with a map of the form "m = { 'def_key' : 'VALUE' }" instead of the
// original "m = { 'VALUE' : '' }".
int get_conf_str_map_helper(
const string &str,
ostringstream &oss,
str_map_t* str_map,
const string &default_key)
{
get_str_map(str, str_map);
if (str_map->size() == 1) {
auto p = str_map->begin();
if (p->second.empty()) {
string s = p->first;
str_map->erase(s);
(*str_map)[default_key] = s;
}
}
return 0;
}
std::string get_value_via_strmap(
const string& conf_string,
std::string_view default_key)
{
auto mp = get_str_map(conf_string);
if (mp.size() != 1) {
return "";
}
// if the one-elem "map" is of the form { 'value' : '' }
// replace it with { 'default_key' : 'value' }
const auto& [k, v] = *(mp.begin());
if (v.empty()) {
return k;
}
return v;
}
std::string get_value_via_strmap(
const string& conf_string,
const string& key,
std::string_view default_key)
{
auto mp = get_str_map(conf_string);
if (mp.size() != 1) {
return std::string{};
}
// if the one-elem "map" is of the form { 'value' : '' }
// replace it with { 'default_key' : 'value' }
const auto& [k, v] = *(mp.begin());
if (v.empty()) {
return k;
}
if (k == key) {
return k;
}
if (k == default_key) {
return v;
}
return string{};
}
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