Add json-schema-validator code.

examples/validator/src/json-uri.cpp

@@ -0,0 +1,187 @@
+/*
+ * Modern C++ JSON schema validator
+ *
+ * Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+ *
+ * Copyright (c) 2016 Patrick Boettcher <patrick.boettcher@posteo.de>.
+ *
+ * Permission is hereby  granted, free of charge, to any  person obtaining a
+ * copy of this software and associated  documentation files (the "Software"),
+ * to deal in the Software  without restriction, including without  limitation
+ * the rights to  use, copy,  modify, merge,  publish, distribute,  sublicense,
+ * and/or  sell copies  of  the Software,  and  to  permit persons  to  whom
+ * the Software  is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS
+ * OR IMPLIED,  INCLUDING BUT  NOT  LIMITED TO  THE  WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR  A PARTICULAR PURPOSE AND  NONINFRINGEMENT. IN
+ * NO EVENT  SHALL THE AUTHORS  OR COPYRIGHT  HOLDERS  BE  LIABLE FOR  ANY
+ * CLAIM,  DAMAGES OR  OTHER LIABILITY, WHETHER IN AN ACTION OF  CONTRACT, TORT
+ * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  OR
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "json-schema.hpp"
+
+namespace nlohmann
+{
+
+void json_pointer::from_string(const std::string &r)
+{
+	str_ = "#";
+
+	if (r.size() == 0)
+		return;
+
+	if (r[0] != '#')
+		throw std::invalid_argument("not a valid JSON pointer - missing # at the beginning");
+
+	if (r.size() == 1)
+		return;
+
+	std::size_t pos = 1;
+
+	do {
+		std::size_t next = r.find('/', pos + 1);
+		str_.append(r.substr(pos, next - pos));
+		pos = next;
+	} while (pos != std::string::npos);
+}
+
+void json_uri::from_string(const std::string &uri)
+{
+	// if it is an urn take it as it is - maybe there is more to be done
+	if (uri.find("urn:") == 0) {
+		urn_ = uri;
+		return;
+	}
+
+	std::string pointer = "#"; // default pointer is the root
+
+	// first split the URI into URL and JSON-pointer
+	auto pointer_separator = uri.find('#');
+	if (pointer_separator != std::string::npos) // and extract the JSON-pointer-string if found
+		pointer = uri.substr(pointer_separator);
+
+	// the rest is an URL
+	std::string url = uri.substr(0, pointer_separator);
+	if (url.size()) { // if an URL is part of the URI
+
+		std::size_t pos = 0;
+		auto proto = url.find("://", pos);
+		if (proto != std::string::npos) { // extract the protocol
+			proto_ = url.substr(pos, proto - pos);
+			pos = 3 + proto; // 3 == "://"
+
+			auto hostname = url.find("/", pos);
+			if (hostname != std::string::npos) { // and the hostname (no proto without hostname)
+				hostname_ = url.substr(pos, hostname - pos);
+				pos = hostname;
+			}
+		}
+
+		// the rest is the path
+		auto path = url.substr(pos);
+		if (path[0] == '/') // if it starts with a / it is root-path
+			path_ = path;
+		else // otherwise it is a subfolder
+			path_.append(path);
+
+		pointer_ = json_pointer("");
+	}
+
+	if (pointer.size() > 0)
+		pointer_ = pointer;
+}
+
+const std::string json_uri::url() const
+{
+	std::stringstream s;
+
+	if (proto_.size() > 0)
+		s << proto_ << "://";
+
+	s << hostname_
+	  << path_;
+
+	return s.str();
+}
+
+std::string json_uri::to_string() const
+{
+	std::stringstream s;
+
+	s << urn_
+	  << url()
+	  << pointer_.to_string();
+
+	return s.str();
+}
+
+std::ostream &operator<<(std::ostream &os, const json_uri &u)
+{
+	return os << u.to_string();
+}
+
+std::string json_uri::unescape(const std::string &src)
+{
+	std::string l = src;
+	std::size_t pos = src.size() - 1;
+
+	do {
+		pos = l.rfind('~', pos);
+
+		if (pos == std::string::npos)
+			break;
+
+		if (pos < l.size() - 1) {
+			switch (l[pos + 1]) {
+			case '0':
+				l.replace(pos, 2, "~");
+				break;
+
+			case '1':
+				l.replace(pos, 2, "/");
+				break;
+
+			default:
+				break;
+			}
+		}
+
+		if (pos == 0)
+			break;
+		pos--;
+	} while (pos != std::string::npos);
+
+	// TODO - percent handling
+
+	return l;
+}
+
+std::string json_uri::escape(const std::string &src)
+{
+	std::vector<std::pair<std::string, std::string>> chars = {
+	    {"~", "~0"},
+	    {"/", "~1"},
+	    {"%", "%25"}};
+
+	std::string l = src;
+
+	for (const auto &c : chars) {
+		std::size_t pos = 0;
+		do {
+			pos = l.find(c.first, pos);
+			if (pos == std::string::npos)
+				break;
+			l.replace(pos, 1, c.second);
+			pos += c.second.size();
+		} while (1);
+	}
+
+	return l;
+}
+
+} // nlohmann