lib/query: refactor & rework

- Move the lib/query/ stuff up a level into lib/
- Associate directly with the Query object
- Rework the Query object to be C++ rather than mixed with C
- Update all dependencies, tests

lib/mu-tokenizer.cc

@@ -0,0 +1,133 @@
+/*
+**  Copyright (C) 2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+**
+**  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.
+**
+**  This library is distributed in the hope that it will be useful,
+**  but WITHOUT ANY WARRANTY; without even the implied warranty of
+**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+**  Lesser General Public License for more details.
+**
+**  You should have received a copy of the GNU Lesser General Public
+**  License along with this library; if not, write to the Free
+**  Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+**  02110-1301, USA.
+*/
+
+#include "mu-tokenizer.hh"
+#include "utils/mu-utils.hh"
+
+#include <cctype>
+#include <iostream>
+#include <algorithm>
+
+using namespace Mu;
+
+static bool
+is_separator (char c)
+{
+	if (isblank(c))
+		return true;
+
+	const auto seps = std::string ("()");
+	return seps.find(c) != std::string::npos;
+}
+
+
+static Mu::Token
+op_or_value (size_t pos, const std::string& val)
+{
+	auto s = val;
+	std::transform(s.begin(), s.end(), s.begin(), ::tolower);
+
+	if (s == "and")
+		return Token{pos, Token::Type::And, val};
+	else if (s == "or")
+		return Token{pos, Token::Type::Or, val};
+	else if (s == "xor")
+		return Token{pos, Token::Type::Xor, val};
+	else if (s == "not")
+		return Token{pos, Token::Type::Not, val};
+	else
+		return Token{pos, Token::Type::Data, val};
+}
+
+static void
+unread_char (std::string& food, char kar, size_t& pos)
+{
+	food = kar + food;
+	--pos;
+}
+
+static Mu::Token
+eat_token (std::string& food, size_t& pos)
+{
+	bool quoted{};
+	bool escaped{};
+	std::string value {};
+
+	while (!food.empty()) {
+
+		const auto kar = food[0];
+		food.erase(0, 1);
+		++pos;
+
+		if (kar == '\\') {
+			escaped = !escaped;
+			if (escaped)
+				continue;
+		}
+
+		if (kar == '"') {
+			if (!escaped && quoted)
+				return Token{pos, Token::Type::Data, value};
+			else {
+				quoted = true;
+				continue;
+			}
+		}
+
+		if (!quoted && !escaped && is_separator(kar)) {
+
+			if (!value.empty() && kar != ':') {
+				unread_char (food, kar, pos);
+				return op_or_value(pos, value);
+			}
+
+			if (quoted || isblank(kar))
+				continue;
+
+			switch (kar) {
+			case '(': return {pos, Token::Type::Open, "("};
+			case ')': return {pos, Token::Type::Close,")"};
+			default: break;
+			}
+		}
+
+		value	+= kar;
+		escaped	 = false;
+	}
+
+	return {pos, Token::Type::Data, value};
+}
+
+
+Mu::Tokens
+Mu::tokenize (const std::string& s)
+{
+	Tokens tokens{};
+
+	std::string food = utf8_clean(s);
+	size_t pos{0};
+
+	if (s.empty())
+		return {};
+
+	while (!food.empty())
+		tokens.emplace_back(eat_token (food, pos));
+
+	return tokens;
+}