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// Copyright (c) 2017-2022, University of Cincinnati, developed by Henry Schreiner
// under NSF AWARD 1414736 and by the respective contributors.
// All rights reserved.
//
// SPDX-License-Identifier: BSD-3-Clause
#pragma once
// [CLI11:public_includes:set]
#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>
// [CLI11:public_includes:end]
#include "Error.hpp"
#include "StringTools.hpp"
namespace CLI {
// [CLI11:config_fwd_hpp:verbatim]
class App;
/// Holds values to load into Options
struct ConfigItem {
/// This is the list of parents
std::vector<std::string> parents{};
/// This is the name
std::string name{};
/// Listing of inputs
std::vector<std::string> inputs{};
/// The list of parents and name joined by "."
std::string fullname() const {
std::vector<std::string> tmp = parents;
tmp.emplace_back(name);
return detail::join(tmp, ".");
}
};
/// This class provides a converter for configuration files.
class Config {
protected:
std::vector<ConfigItem> items{};
public:
/// Convert an app into a configuration
virtual std::string to_config(const App *, bool, bool, std::string) const = 0;
/// Convert a configuration into an app
virtual std::vector<ConfigItem> from_config(std::istream &) const = 0;
/// Get a flag value
virtual std::string to_flag(const ConfigItem &item) const {
if(item.inputs.size() == 1) {
return item.inputs.at(0);
}
if(item.inputs.empty()) {
return "{}";
}
throw ConversionError::TooManyInputsFlag(item.fullname());
}
/// Parse a config file, throw an error (ParseError:ConfigParseError or FileError) on failure
std::vector<ConfigItem> from_file(const std::string &name) {
std::ifstream input{name};
if(!input.good())
throw FileError::Missing(name);
return from_config(input);
}
/// Virtual destructor
virtual ~Config() = default;
};
/// This converter works with INI/TOML files; to write INI files use ConfigINI
class ConfigBase : public Config {
protected:
/// the character used for comments
char commentChar = '#';
/// the character used to start an array '\0' is a default to not use
char arrayStart = '[';
/// the character used to end an array '\0' is a default to not use
char arrayEnd = ']';
/// the character used to separate elements in an array
char arraySeparator = ',';
/// the character used separate the name from the value
char valueDelimiter = '=';
/// the character to use around strings
char stringQuote = '"';
/// the character to use around single characters
char characterQuote = '\'';
/// the maximum number of layers to allow
uint8_t maximumLayers{255};
/// the separator used to separator parent layers
char parentSeparatorChar{'.'};
/// Specify the configuration index to use for arrayed sections
int16_t configIndex{-1};
/// Specify the configuration section that should be used
std::string configSection{};
public:
std::string
to_config(const App * /*app*/, bool default_also, bool write_description, std::string prefix) const override;
std::vector<ConfigItem> from_config(std::istream &input) const override;
/// Specify the configuration for comment characters
ConfigBase *comment(char cchar) {
commentChar = cchar;
return this;
}
/// Specify the start and end characters for an array
ConfigBase *arrayBounds(char aStart, char aEnd) {
arrayStart = aStart;
arrayEnd = aEnd;
return this;
}
/// Specify the delimiter character for an array
ConfigBase *arrayDelimiter(char aSep) {
arraySeparator = aSep;
return this;
}
/// Specify the delimiter between a name and value
ConfigBase *valueSeparator(char vSep) {
valueDelimiter = vSep;
return this;
}
/// Specify the quote characters used around strings and characters
ConfigBase *quoteCharacter(char qString, char qChar) {
stringQuote = qString;
characterQuote = qChar;
return this;
}
/// Specify the maximum number of parents
ConfigBase *maxLayers(uint8_t layers) {
maximumLayers = layers;
return this;
}
/// Specify the separator to use for parent layers
ConfigBase *parentSeparator(char sep) {
parentSeparatorChar = sep;
return this;
}
/// get a reference to the configuration section
std::string §ionRef() { return configSection; }
/// get the section
const std::string §ion() const { return configSection; }
/// specify a particular section of the configuration file to use
ConfigBase *section(const std::string §ionName) {
configSection = sectionName;
return this;
}
/// get a reference to the configuration index
int16_t &indexRef() { return configIndex; }
/// get the section index
int16_t index() const { return configIndex; }
/// specify a particular index in the section to use (-1) for all sections to use
ConfigBase *index(int16_t sectionIndex) {
configIndex = sectionIndex;
return this;
}
};
/// the default Config is the TOML file format
using ConfigTOML = ConfigBase;
/// ConfigINI generates a "standard" INI compliant output
class ConfigINI : public ConfigTOML {
public:
ConfigINI() {
commentChar = ';';
arrayStart = '\0';
arrayEnd = '\0';
arraySeparator = ' ';
valueDelimiter = '=';
}
};
// [CLI11:config_fwd_hpp:end]
} // namespace CLI
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