[thin_debug] Factor out reusable componments

base/command_interpreter.cc

@@ -0,0 +1,44 @@
+#include "base/command_interpreter.h"
+
+using namespace dbg;
+using namespace std;
+
+//----------------------------------------------------------------
+
+namespace {
+	strings read_input(std::istream &in) {
+		using namespace boost::algorithm;
+
+		std::string input;
+		getline(in, input);
+
+		strings toks;
+		split(toks, input, is_any_of(" \t"), token_compress_on);
+
+		return toks;
+	}
+}
+
+//----------------------------------------------------------------
+
+void command_interpreter::do_once() {
+	if (in_.eof())
+		throw runtime_error("input closed");
+
+	out_ << "> ";
+	strings args = read_input(in_);
+
+	std::map<std::string, command::ptr>::iterator it;
+	it = commands_.find(args[0]);
+	if (it == commands_.end())
+		out_ << "Unrecognised command" << endl;
+	else {
+		try {
+			it->second->exec(args, out_);
+		} catch (std::exception &e) {
+			cerr << e.what() << endl;
+		}
+	}
+}
+
+//----------------------------------------------------------------

base/command_interpreter.h

@@ -0,0 +1,60 @@
+#ifndef DBG_COMMAND_INTERPRETER
+#define DBG_COMMAND_INTERPRETER
+
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/split.hpp>
+
+#include <iostream>
+#include <map>
+#include <string>
+#include <vector>
+
+//----------------------------------------------------------------
+
+namespace dbg {
+	typedef std::vector<std::string> strings;
+
+	class command {
+	public:
+		typedef std::shared_ptr<command> ptr;
+
+		virtual ~command() {}
+		virtual void exec(strings const &args, std::ostream &out) = 0;
+	};
+
+	class command_interpreter {
+	public:
+		typedef std::shared_ptr<command_interpreter> ptr;
+
+		command_interpreter(std::istream &in, std::ostream &out)
+			: in_(in),
+			  out_(out),
+			  exit_(false) {
+		}
+
+		void register_command(std::string const &str, command::ptr cmd) {
+			commands_.insert(make_pair(str, cmd));
+		}
+
+		void enter_main_loop() {
+			while (!exit_)
+				do_once();
+		}
+
+		void exit_main_loop() {
+			exit_ = true;
+		}
+
+	private:
+		void do_once();
+
+		std::istream &in_;
+		std::ostream &out_;
+		std::map <std::string, command::ptr> commands_;
+		bool exit_;
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif

base/output_formatter.cc

@@ -0,0 +1,53 @@
+#include <string>
+
+#include "base/output_formatter.h"
+
+using namespace dbg;
+using namespace std;
+
+//----------------------------------------------------------------
+
+namespace {
+	void indent(int depth, std::ostream &out) {
+		for (int i = 0; i < depth * 2; i++)
+			out << ' ';
+	}
+}
+
+//----------------------------------------------------------------
+
+void xml_formatter::output(std::ostream &out,
+			   int depth,
+			   boost::optional<std::string> name) {
+	indent(depth, out);
+	out << "<fields";
+	if (name && (*name).length())
+		out << " id=\"" << *name << "\"";
+
+	/* output non-child fields */
+	std::vector<field_type>::const_iterator it;
+	for (it = fields_.begin(); it != fields_.end(); ++it) {
+		if (string const *s = boost::get<string>(&it->get<1>())) {
+			out << " " << it->get<0>() << "=\"" << *s << "\"";
+		}
+	}
+
+	if (children_.size() == 0) {
+		out << " />" << endl;
+		return;
+	}
+
+	/* output child fields */
+	out << ">" << endl;
+	for (it = children_.begin(); it != children_.end(); ++it) {
+		if (!boost::get<string>(&it->get<1>())) {
+			formatter::ptr f = boost::get<formatter::ptr>(it->get<1>());
+			f->output(out, depth + 1, it->get<0>());
+		}
+	}
+
+	indent(depth, out);
+	out << "</fields>" << endl;
+}
+
+//----------------------------------------------------------------

base/output_formatter.h

@@ -0,0 +1,59 @@
+#ifndef DBG_OUTPUT_FORMATTER_H
+#define DBG_OUTPUT_FORMATTER_H
+
+#include <boost/lexical_cast.hpp>
+#include <boost/optional.hpp>
+#include <boost/tuple/tuple.hpp>
+#include <boost/variant.hpp>
+
+#include <vector>
+#include <string>
+
+//----------------------------------------------------------------
+
+namespace dbg {
+	class formatter {
+	public:
+		typedef std::shared_ptr<formatter> ptr;
+
+		virtual ~formatter() {}
+
+		typedef boost::optional<std::string> maybe_string;
+
+		void field(std::string const &name, std::string const &value) {
+			fields_.push_back(field_type(name, value));
+		}
+
+		void child(std::string const &name, formatter::ptr t) {
+			children_.push_back(field_type(name, t));
+		}
+
+		virtual void output(std::ostream &out, int depth = 0,
+				    boost::optional<std::string> name = boost::none) = 0;
+
+	protected:
+		typedef boost::variant<std::string, ptr> value;
+		typedef boost::tuple<std::string, value> field_type;
+
+		std::vector<field_type> fields_;
+		std::vector<field_type> children_;
+	};
+
+	template <typename T>
+	void
+	field(formatter &t, std::string const &name, T const &value) {
+		t.field(name, boost::lexical_cast<std::string>(value));
+	}
+
+	//--------------------------------
+
+	class xml_formatter : public formatter {
+	public:
+		virtual void output(std::ostream &out, int depth = 0,
+				    boost::optional<std::string> name = boost::none);
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif