Function DumpLine

src/settingsgen/settingsgen.cpp:222–264

* Parse a single entry via a template and output this. * @param item The template to use for the output. * @param grp Group current being used for template rendering. * @param default_grp Default values for items not set in @grp. * @param output Output to use for result. */

 * @param output Output to use for result.
 */
static void DumpLine(const IniItem *item, const IniGroup *grp, const IniGroup *default_grp, OutputStore &output)
{
	/* Prefix with #if/#ifdef/#ifndef */
	static const auto pp_lines = {"if", "ifdef", "ifndef"};
	int count = 0;
	for (const auto &name : pp_lines) {
		auto condition = FindItemValue(name, grp, default_grp);
		if (condition.has_value()) {
			output.Add("#");
			output.Add(name);
			output.Add(" ");
			output.Add(*condition);
			output.Add("\n");
			count++;
		}
	}

	/* Output text of the template, except template variables of the form '$[_a-z0-9]+' which get replaced by their value. */
	static const std::string_view variable_name_characters = "_abcdefghijklmnopqrstuvwxyz0123456789";
	StringConsumer consumer{*item->value};
	while (consumer.AnyBytesLeft()) {
		char c = consumer.ReadChar();
		if (c != '$' || consumer.ReadIf("$")) {
			/* No $ or $$ (literal $). */
			output.Add(std::string_view{&c, 1});
			continue;
		}

		std::string_view variable = consumer.ReadUntilCharNotIn(variable_name_characters);
		if (!variable.empty()) {
			/* Find the text to output. */
			auto valitem = FindItemValue(variable, grp, default_grp);
			if (valitem.has_value()) output.Add(*valitem);
		} else {
			output.Add("$");
		}
	}
	output.Add("\n"); // \n after the expanded template.
	while (count > 0) {
		output.Add("#endif\n");
		count--;
	}
}

/**
 * Output all non-special sections through the template / template variable expansion system.