JSON parser with comment

[redboltz]

The broker part of async_mqtt uses Boost.PropertyTree JSON parser.

async_mqtt/include/async_mqtt/broker/security.hpp

Line 15 in 8d3ef84

#include <boost/property_tree/json_parser.hpp>

It is for Access Control List.

JSON doesn't have a way to write comments. So async_mqtt add comments functionality. It works as preprosessor of Boost.PropertyTree JSON parser:

async_mqtt/include/async_mqtt/broker/security.hpp

Lines 48 to 69 in 8d3ef84

	/** Remove comments from a JSON file (comments start with # and are not inside ' ' or " ") */
	inline std::string json_remove_comments(std::istream& input) {
	bool inside_comment = false;
	bool inside_single_quote = false;
	bool inside_double_quote = false;
	std::ostringstream result;
	while (true) {
	char c;
	if (input.get(c).eof()) break;
	if (!inside_double_quote && !inside_single_quote && c == '#') inside_comment = true;
	if (!inside_comment && !inside_double_quote && c == '\'') inside_single_quote = !inside_single_quote;
	if (!inside_comment && !inside_single_quote && c == '"') inside_double_quote = !inside_double_quote;
	if (c == '\n') inside_comment = false;
	if (!inside_comment) result << c;
	}
	return result.str();
	}

I guess that there is more elegant way.

[redboltz]

This is only used by the broker. It is not the part of library. Just a tool.

[redboltz]

NOTE: broker part is NOT a part of public APIs. It is tool expansion for broker.