src/lib/XMLNameCodec.h
author František Kučera <franta-hg@frantovo.cz>
Fri, 26 Aug 2022 22:41:55 +0200
branchv_0
changeset 37 d89f621951ae
parent 16 b9a3c806468a
permissions -rw-r--r--
fix typo: enbaled → enabled (thanks Jiří Wolker for reporting)
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/**
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 * Relational pipes
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 * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, version 3 of the License.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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 */
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#pragma once
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#include <sstream>
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#include <iomanip>
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#include <stdexcept>
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#include <glibmm-2.4/glibmm/ustring.h>
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namespace relpipe {
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namespace in {
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namespace xmltable {
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class XMLNameCodec {
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private:
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	static const char DEFAULT_ESCAPING_CHARACTER = '_';
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	const char esc;
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	const bool namespaceAware;
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	bool between(gunichar codepoint, gunichar start, gunichar end) {
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		return codepoint >= start && codepoint <= end;
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	}
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	/**
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	 * https://www.w3.org/TR/REC-xml/#NT-NameStartChar
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	 *
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	 * @param codepoint unicode character
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	 * @return whether this character is allowed at the beginning of a XML name
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	 */
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	bool isValidNameStartChar(gunichar codepoint) {
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		// NameStartChar  ::= ":" | [A-Z] | "_" | [a-z] 
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		//   | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF]
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		//   | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF]
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		//   | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
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		return (codepoint == ':' && !namespaceAware) || between(codepoint, 'A', 'Z') || codepoint == '_' || between(codepoint, 'a', 'z')
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				|| between(codepoint, 0xC0, 0xD6) || between(codepoint, 0xD8, 0xF6) || between(codepoint, 0xF8, 0x2FF) || between(codepoint, 0x370, 0x37D) || between(codepoint, 0x37F, 0x1FFF)
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				|| between(codepoint, 0x200C, 0x200D) || between(codepoint, 0x2070, 0x218F) || between(codepoint, 0x2C00, 0x2FEF) || between(codepoint, 0x3001, 0xD7FF)
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				|| between(codepoint, 0xF900, 0xFDCF) || between(codepoint, 0xFDF0, 0xFFFD) || between(codepoint, 0x10000, 0xEFFFF);
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	}
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	/**
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	 * https://www.w3.org/TR/REC-xml/#NT-NameChar
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	 *
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	 * @param codepoint unicode character
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	 * @return whether this character is allowed in a XML name
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	 */
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	bool isValidNameChar(gunichar codepoint) {
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		// NameChar       ::= NameStartChar | "-" | "." | [0-9] 
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		//   | #xB7
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		//   | [#x0300-#x036F] | [#x203F-#x2040]
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		return isValidNameStartChar(codepoint) || codepoint == '-' || codepoint == '.' || between(codepoint, '0', '9')
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				|| codepoint == 0xB7
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				|| between(codepoint, 0x0300, 0x036F) || between(codepoint, 0x203F, 0x2040);
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	}
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public:
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	XMLNameCodec() : XMLNameCodec(DEFAULT_ESCAPING_CHARACTER, true) {
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	}
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	/**
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	 * @param escapingCharacter must be valid character allowed not only in the middle of the XML name but also as the
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	 * first character of the name
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    79
	 * @param namespaceAware colon character is reserved as a separator of the prefix and the local name, see
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	 * https://www.w3.org/TR/REC-xml-names/#NT-NCName
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	 * @throws std::invalid_argument if escapingCharacter is not valid
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	 */
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	XMLNameCodec(const char escapingCharacter, const bool namespaceAware) : esc(escapingCharacter), namespaceAware(namespaceAware) {
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    84
		// TODO: allow also characters like #xB7 and add another escaping if they occur at the beginning of the name?
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    85
		if (!isValidNameStartChar(esc)) {
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			throw std::invalid_argument("The character „" + std::to_string(escapingCharacter) + "“ is not allowed at the beginning of a XML name and thus not usable for escaping");
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    87
		}
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	}
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    89
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    90
	virtual ~XMLNameCodec() {
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    91
	}
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	/**
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	 * @param name any string
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    95
	 * @return valid name of XML element or attribute
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    96
	 */
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    97
	Glib::ustring encode(Glib::ustring name) {
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    98
		if (name.empty()) {
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    99
			return Glib::ustring(1, esc);
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   100
		} else {
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   101
			std::stringstream result;
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   102
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   103
			for (int i = 0; i < name.size(); i++) {
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				gunichar codepoint = name[i];
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   105
				if (codepoint == esc) {
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					result.put(esc);
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					result.put(esc);
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   108
					continue;
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   109
				} else if ((i == 0 && isValidNameStartChar(codepoint)) || (i > 0 && isValidNameChar(codepoint))) {
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					result << Glib::ustring(1, codepoint);
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   111
					continue;
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   112
				}
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   113
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   114
				result.put(esc);
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   115
				result << Glib::ustring::format(std::hex, std::setfill(L'0'), std::setw(2), codepoint);
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   116
				result.put(esc);
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   117
			}
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   118
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			return result.str();
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		}
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   121
	}
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};
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}
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}
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}