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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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* @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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// TODO: allow also characters like #xB7 and add another escaping if they occur at the beginning of the name?
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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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}
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}
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virtual ~XMLNameCodec() {
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}
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/**
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* @param name any string
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* @return valid name of XML element or attribute
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*/
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Glib::ustring encode(Glib::ustring name) {
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if (name.empty()) {
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return Glib::ustring(1, esc);
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} else {
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std::stringstream result;
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for (int i = 0; i < name.size(); i++) {
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gunichar codepoint = name[i];
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if (codepoint == esc) {
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result.put(esc);
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result.put(esc);
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continue;
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} else if ((i == 0 && isValidNameStartChar(codepoint)) || (i > 0 && isValidNameChar(codepoint))) {
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result << Glib::ustring(1, codepoint);
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continue;
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}
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result.put(esc);
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result << Glib::ustring::format(std::hex, std::setfill(L'0'), std::setw(2), codepoint);
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result.put(esc);
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}
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return result.str();
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}
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}
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};
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}
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}
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}
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