From 96476044387e98ee1ee7a6eb992b521bd447813c Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Fri, 3 Mar 2023 16:55:33 +0100
Subject: Renamed whiteboard to webchat

---
 diff.cpp | 188 ---------------------------------------------------------------
 1 file changed, 188 deletions(-)
 delete mode 100644 diff.cpp

(limited to 'diff.cpp')

diff --git a/diff.cpp b/diff.cpp
deleted file mode 100644
index 6ac24e7..0000000
--- a/diff.cpp
+++ /dev/null
@@ -1,188 +0,0 @@
-#include "diff.h"
-
-#include <algorithm>
-#include <iostream>
-#include <sstream>
-
-#include <boost/property_tree/xml_parser.hpp>
-
-namespace pt = boost::property_tree;
-
-Diff::Diff()
-{
-}
-
-Diff::Diff(const std::string& old_version, const std::string& new_version)
-{
- create(old_version, new_version);
-}
-
-std::string Diff::apply(const std::string& old_version) const
-{
- std::string result{old_version};
-
- if (m_pos0 <= m_pos1 && m_pos1 <= old_version.size()) {
-  result.erase(m_pos0, m_pos1 - m_pos0);
-  result.insert(m_pos0, m_data);
- }
- 
- return result;
-}
-
-void Diff::create(const std::string& old_version, const std::string& new_version)
-{
- auto front_mismatch{std::mismatch(old_version.cbegin(), old_version.cend(), new_version.cbegin(), new_version.cend())};
- std::string::difference_type old_pos0 {front_mismatch.first - old_version.cbegin()};
- auto& new_pos0 {old_pos0};
-
- // equal
- if (old_pos0 == old_version.size() && new_pos0 == new_version.size()) {
-  m_pos0 = 0;
-  m_pos1 = 0;
-  m_data.clear();
-  return;
- }
-
- // append at end
- if (old_pos0 == old_version.size()) {
-  m_pos0 = old_pos0;
-  m_pos1 = old_pos0;
-  m_data = new_version.substr(new_pos0);
-  return;
- }
-
- // remove from end
- if (new_pos0 == new_version.size()) {
-  m_pos0 = old_pos0;
-  m_pos1 = old_version.size();
-  m_data.clear();
-  return;
- }
-
- auto back_mismatch{std::mismatch(old_version.crbegin(), old_version.crend(), new_version.crbegin(), new_version.crend())};
- // i.e. the indices starting from which we can assume equality
- size_t old_pos1 {old_version.size() - (back_mismatch.first - old_version.crbegin())};
- size_t new_pos1 {new_version.size() - (back_mismatch.second - new_version.crbegin())};
-
- // complete equality is already handled above
- 
- // insert at start
- if (old_pos1 == 0) {
-  m_pos0 = 0;
-  m_pos1 = 0;
-  m_data = new_version.substr(0, new_pos1);
-  return;
- }
-
- // remove from start
- if (new_pos1 == 0) {
-  m_pos0 = 0;
-  m_pos1 = old_pos1;
-  m_data.clear();
-  return;
- }
-
- // re-adjust if search crossed
- if (old_pos0 > old_pos1) {
-  old_pos0 = old_pos1;
-  new_pos0 = old_pos1;
- }
- if (new_pos0 > new_pos1) {
-  old_pos0 = new_pos1;
-  new_pos0 = new_pos1;
- }
-
- // insert in the middle
- if (old_pos0 == old_pos1) {
-  m_pos0 = old_pos0;
-  m_pos1 = old_pos0;
-  m_data = new_version.substr(new_pos0, new_pos1 - new_pos0);
-  return;
- }
- 
- // remove from the middle
- if (new_pos0 == new_pos1) {
-  m_pos0 = old_pos0;
-  m_pos1 = old_pos1;
-  m_data.clear();
-  return;
- }
-
- // last resort: remove and add in the middle
- m_pos0 = old_pos0;
- m_pos1 = old_pos1;
- m_data = new_version.substr(old_pos0, new_pos1 - new_pos0);
-}
-
-Diff::Diff(const boost::property_tree::ptree& ptree)
-{
- create(ptree);
-}
-
-void Diff::create(const boost::property_tree::ptree& ptree)
-{
- m_pos0 = ptree.get<int>("diff.start");
- m_pos1 = ptree.get<int>("diff.end");
-
- if (m_pos0 > m_pos1)
-  throw std::runtime_error("Bad range in diff");
-
- m_data = ptree.get<std::string>("diff.data");
-}
-
-Diff::Diff(const std::string& xml)
-{
- create(xml);
-}
-
-void Diff::create(const std::string& xml)
-{
- pt::ptree ptree;
- std::istringstream ss{xml};
- pt::read_xml(ss, ptree);
-
- create(ptree);
-}
-
-bool Diff::empty() const
-{
- return m_pos0 == m_pos1 && m_data.empty();
-}
-
-boost::property_tree::ptree Diff::get_structure() const
-{
- pt::ptree ptree;
- ptree.put("diff.start", std::to_string(m_pos0));
- ptree.put("diff.end", std::to_string(m_pos1));
- ptree.put("diff.data", m_data);
-
- return ptree;
-}
-
-std::string Diff::get_xml() const
-{
- pt::ptree ptree{get_structure()};
-
- std::ostringstream oss;
- // write_xml_element instead of write_xml to omit <!xml...> header
- //pt::xml_parser::write_xml(oss, xml);
- pt::xml_parser::write_xml_element(oss, {}, ptree, -1, boost::property_tree::xml_writer_settings<pt::ptree::key_type>{});
- return oss.str();
-}
-
-extern "C" {
-
- const char* diff_create(const char* old_version, const char* new_version)
- {
-  Diff diff{old_version, new_version};
-  return strdup(diff.get_xml().c_str());
- }
-
- const char* diff_apply(const char* old_version, const char* diff)
- {
-  Diff d{diff};
-
-  return strdup(d.apply(old_version).c_str());
- }
-
-}
-- 
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