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|
/*
Copyright (©) 2003-2025 Teus Benschop.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <editor/html2usfm.h>
#include <filter/string.h>
#include <filter/url.h>
#include <filter/usfm.h>
#include <locale/translate.h>
#include <styles/logic.h>
#include <database/logs.h>
#include <pugixml/utils.h>
#include <filter/quill.h>
// This function returns a struct of:
// 1. Normal classes, like "add", "nd", and so on.
// 2. A string with the word-level attributes class, like "wla2" for example.
// 3. A string with the milestone attributes class, like "mls2" for example.
struct std_wla_mls {
std::vector<std::string> standard_classes;
std::string word_level_attributes_class;
std::string milestone_attributes_class;
};
static std_wla_mls get_standard_classes_and_wla_or_mls_class (const std::string& class_name)
{
std_wla_mls std_wla_mls;
constexpr char separator = '0';
std::vector <std::string> classes = filter::strings::explode (class_name, separator);
std::string wla{};
for (auto iter = classes.cbegin(); iter != classes.cend(); iter++) {
if (iter->find(quill::word_level_attribute_class_prefix) == 0) {
std_wla_mls.word_level_attributes_class = *iter;
classes.erase(iter);
break;
}
if (iter->find(quill::milestone_attribute_class_prefix) == 0) {
std_wla_mls.milestone_attributes_class = *iter;
classes.erase(iter);
break;
}
}
std_wla_mls.standard_classes = std::move(classes);
return std_wla_mls;
}
void Editor_Html2Usfm::load (std::string html)
{
// The web editor may insert non-breaking spaces. Convert them to normal spaces.
html = filter::strings::replace (filter::strings::unicode_non_breaking_space_entity (), " ", html);
// The web editor produces <hr> and other elements following the HTML specs,
// but the pugixml XML parser needs <hr/> and similar elements.
html = filter::strings::html2xml (html);
const std::string xml = "<body>" + std::move(html) + "</body>";
// Parse document such that all whitespace is put in the DOM tree.
// See https://pugixml.org/docs/manual.html for more information.
// It is not enough to only parse with parse_ws_pcdata_single, it really needs parse_ws_pcdata.
// This is significant for, for example, the space after verse numbers, among other cases.
pugi::xml_parse_result result = m_document.load_string (xml.c_str(), pugi::parse_ws_pcdata);
// Log parsing errors.
pugixml_utils_error_logger (&result, xml);
}
void Editor_Html2Usfm::stylesheet (const std::string& stylesheet)
{
m_note_openers.clear();
m_suppress_end_markers.clear();
m_force_end_markers.clear();
m_character_styles.clear();
const std::list<stylesv2::Style> styles = database::styles::get_styles (stylesheet);
for (const auto& style : styles) {
// Paragraph styles normally don't have a closing USFM marker.
// But there's exceptions to this rule.
// Gather the markers that need a closing USFM marker.
if (stylesv2::get_parameter<bool>(&style, stylesv2::Property::has_endmarker))
m_force_end_markers.insert(style.marker);
// Get markers that should not have endmarkers.
// Gather the note openers.
bool suppress_endmarker = false;
if (style.type == stylesv2::Type::verse)
suppress_endmarker = true;
if (style.type == stylesv2::Type::table_row)
suppress_endmarker = true;
if (style.type == stylesv2::Type::table_heading)
suppress_endmarker = true;
if (style.type == stylesv2::Type::table_cell)
suppress_endmarker = true;
if (style.type == stylesv2::Type::footnote_wrapper) {
suppress_endmarker = true;
m_note_openers.insert (style.marker);
}
if (style.type == stylesv2::Type::endnote_wrapper) {
suppress_endmarker = true;
m_note_openers.insert (style.marker);
}
if (style.type == stylesv2::Type::note_standard_content)
suppress_endmarker = true;
if (style.type == stylesv2::Type::note_content)
suppress_endmarker = true;
if (style.type == stylesv2::Type::note_paragraph)
suppress_endmarker = true;
if (style.type == stylesv2::Type::crossreference_wrapper) {
suppress_endmarker = true;
m_note_openers.insert (style.marker);
}
if (style.type == stylesv2::Type::crossreference_standard_content)
suppress_endmarker = true;
if (style.type == stylesv2::Type::crossreference_content)
suppress_endmarker = true;
if (suppress_endmarker)
m_suppress_end_markers.insert (style.marker);
if (style.type == stylesv2::Type::milestone)
m_milestone_markers.insert (style.marker);
}
}
void Editor_Html2Usfm::run ()
{
pre_process ();
main_process ();
post_process ();
}
void Editor_Html2Usfm::main_process ()
{
// Iterate over the children to retrieve the "p" elements, then process them.
const pugi::xml_node body = m_document.first_child ();
for (pugi::xml_node& node : body.children()) {
// Do not process the notes <p> and beyond
// because it is at the end of the text body,
// and note-related data has already been extracted from it.
const std::string classs = update_quill_class (node.attribute ("class").value ());
if (classs == quill::notes_class) {
break;
}
// Process the node.
process_node(node);
}
}
std::string Editor_Html2Usfm::get ()
{
// Generate the USFM as one string.
const std::string usfm = filter::strings::implode (m_output, "\n");
return clean_usfm (usfm);
}
void Editor_Html2Usfm::process_node(pugi::xml_node& node)
{
switch (node.type ()) {
case pugi::node_element:
{
const std::string classs = node.attribute("class").value();
// Skip a node with class "ql-cursor" because that is an internal Quill node.
// The user didn't insert it.
if (classs == quill::caret_class)
break;
// Skip a node that is for the word-level attributes since it is just there for visual appearance.
// The user didn't insert it.
if (classs.find(quill::word_level_attributes_class) != std::string::npos)
break;
// Process this node.
open_element_node (node);
for (pugi::xml_node& child : node.children()) {
process_node(child);
}
close_element_node (node);
break;
}
case pugi::node_pcdata:
{
// Add the text to the current USFM line.
m_last_added_text_fragment = node.text ().get ();
m_current_line.append(m_last_added_text_fragment);
break;
}
case pugi::node_null:
case pugi::node_document:
case pugi::node_comment:
case pugi::node_pi:
case pugi::node_declaration:
case pugi::node_doctype:
case pugi::node_cdata:
default:
{
Database_Logs::log ("XML node " + std::string(node.name ()) + " not handled while saving editor text");
break;
}
}
}
void Editor_Html2Usfm::open_element_node (pugi::xml_node& node)
{
// The tag and class names of this element node.
const std::string tag_name = node.name ();
std::string class_name = update_quill_class (node.attribute ("class").value ());
if (tag_name == "p")
{
// While editing, it may occur that the p element does not have a class.
// Use the 'p' class in such cases.
if (class_name.empty ())
class_name = "p";
if (class_name == "mono") {
// Class 'mono': The editor has the full USFM in the text.
m_mono = true;
} else {
// Start the USFM line with a marker with the class name.
m_current_line.append(filter::usfm::get_opening_usfm (class_name));
}
}
if (tag_name == "span")
{
if (class_name == "v") {
// Handle the verse.
flush_line ();
open_inline (class_name);
}
else if (class_name.empty ()) {
// Normal text is wrapped in elements without a class attribute.
}
else if (class_name.substr (0, quill::note_caller_class.size()) == quill::note_caller_class) {
// Note in Quill-based editor.
process_note_citation (node);
}
else {
// Handle remaining class attributes for inline text.
open_inline (class_name);
}
}
if (tag_name == "a")
{
process_note_citation (node);
}
}
void Editor_Html2Usfm::close_element_node (const pugi::xml_node& node)
{
// Get the tag name of this node.
const std::string tag_name = node.name ();
// Get the class names of this node.
// Get the word-level attributes class name / identifier.
// Get the milestone attributes class name / identifier.
std::string class_name = update_quill_class (node.attribute ("class").value ());
auto std_wla_mls = get_standard_classes_and_wla_or_mls_class (class_name);
if (tag_name == "p")
{
// While editing it happens that the p element does not have a class.
// Use the 'p' class in such cases.
if (class_name.empty())
class_name = "p";
if (m_note_openers.find (class_name) != m_note_openers.cend()) {
// Deal with note closers.
m_current_line.append(filter::usfm::get_closing_usfm (class_name));
} else {
// If this style should add an endmarker, handle that here.
if (m_force_end_markers.find(class_name) != m_force_end_markers.cend()) {
m_current_line.append(filter::usfm::get_closing_usfm (class_name));
}
// Normally a p element closes the USFM line.
flush_line ();
m_mono = false;
// Clear active character styles.
m_character_styles.clear();
}
}
if (tag_name == "span")
{
// Do nothing for monospace elements, because the USFM would be the text nodes only.
if (m_mono)
return;
// Do nothing without a class.
if (class_name.empty())
return;
// Do nothing with a note caller.
if (class_name.substr (0, quill::note_caller_class.size()) == quill::note_caller_class)
return;
// Check for and get and handle word-level attributes.
if (!std_wla_mls.word_level_attributes_class.empty()) {
if (!m_word_level_attributes[std_wla_mls.word_level_attributes_class].empty()) {
// The vertical bar separates the canonical word from the attribute(s) following it.
m_current_line.append("|");
m_current_line.append(std::move(m_word_level_attributes[std_wla_mls.word_level_attributes_class]));
}
// Clean up.
m_word_level_attributes.erase(std_wla_mls.word_level_attributes_class);
}
// Function for detecting whether closing a milestone class.
const auto is_milestone = [this, &std_wla_mls, &class_name]() {
if (!std_wla_mls.milestone_attributes_class.empty())
return true;
if (m_milestone_markers.find (class_name) != m_milestone_markers.end())
return true;
return false;
};
// If this is a milestone, then it means that the current line contains the milestone emoji.
// This emoji is put in the editor for visual appearance only, but should not be part of the USFM generated.
// Remove it here.
if (is_milestone())
m_current_line = filter::strings::replace (quill::milestone_emoji, std::string(), std::move(m_current_line));
// Check for and get and handle milestone attributes.
if (is_milestone()) {
if (!m_milestone_attributes[std_wla_mls.milestone_attributes_class].empty()) {
// The vertical bar separates the opening marker from the attribute(s) following it.
m_current_line.append("|");
m_current_line.append(m_milestone_attributes[std_wla_mls.milestone_attributes_class]);
}
// Clean up.
m_milestone_attributes.erase(std_wla_mls.milestone_attributes_class);
}
// Do nothing more if no endmarkers are supposed to be produced.
// There's an exception in the case of linking attributes.
if (m_suppress_end_markers.find (class_name) != m_suppress_end_markers.end()) {
// Linking attributes are used in this: \xt 1|GEN 2:1\xt*
// It means the signature is that the last added text fragment contains the vertical bar,
// but not right at the first position.
// This distinguishes it from the vertical bar that is used when inserting a note in the Bible editor.
// See https://github.com/bibledit/cloud/issues/1030
const auto linking_attribute = [this] () {
const std::size_t pos = m_last_added_text_fragment.find("|");
if (pos == std::string::npos)
return false;
if (pos != 0)
return true;
return false;
};
if (!linking_attribute())
return;
}
// Add closing USFM, optionally closing embedded tags in reverse order.
m_character_styles = filter::strings::array_diff (m_character_styles, std_wla_mls.standard_classes);
reverse (std_wla_mls.standard_classes.begin(), std_wla_mls.standard_classes.end());
for (unsigned int offset = 0; offset < std_wla_mls.standard_classes.size(); offset++) {
bool embedded = (std_wla_mls.standard_classes.size () > 1) && (offset == 0);
if (!m_character_styles.empty ())
embedded = true;
if (is_milestone()) {
// Adding a milestone endmarker: \*
// If the last character of the current line is a space,
// it is assumed that this is the space from the milestone opening marker.
// If the opener is followed by the closer, without attributes between them,
// then in USFM it is customary to remove that last space.
// The resulting fragment then looks like e.g. this: \qt-e\*
if (!m_current_line.empty())
if (m_current_line.back() == ' ')
m_current_line.pop_back();
m_current_line.append (filter::usfm::get_closing_usfm (std::string(), false));
}
else
// Normal endmarker: \marker*
m_current_line.append (filter::usfm::get_closing_usfm (std_wla_mls.standard_classes [offset], embedded));
m_last_note_style.clear();
}
}
if (tag_name == "a")
{
// Do nothing for note citations in the text.
}
}
void Editor_Html2Usfm::open_inline (const std::string& class_name)
{
// It has been observed that the <span> elements of the character styles may be embedded, like so:
// The <span class="add">
// <span class="nd">Lord God</span>
// is calling</span> you</span><span>.</span>
const auto std_wla_mls = get_standard_classes_and_wla_or_mls_class(class_name);
for (unsigned int offset = 0; offset < std_wla_mls.standard_classes.size(); offset++) {
const bool embedded = (m_character_styles.size () + offset) > 0;
std::string marker = std_wla_mls.standard_classes.at(offset);
// Milestones have an underscore due to requirement of Quill editor: Change to hyphen.
if (!std_wla_mls.milestone_attributes_class.empty())
marker = quill::underscore_to_hyphen (std::move(marker));
bool add_opener = true;
if (m_processing_note) {
// If the style within the note has already been opened before,
// do not open the same style again.
// https://github.com/bibledit/cloud/issues/353
if (marker == m_last_note_style)
add_opener = false;
m_last_note_style = marker;
} else {
m_last_note_style.clear ();
}
if (add_opener) {
m_current_line.append (filter::usfm::get_opening_usfm (marker, embedded));
}
}
// Store active character styles in some cases.
bool store = true;
if (m_suppress_end_markers.find (class_name) != m_suppress_end_markers.end ())
store = false;
if (m_processing_note)
store = false;
if (store) {
m_character_styles.insert (m_character_styles.end(), std_wla_mls.standard_classes.begin(), std_wla_mls.standard_classes.end());
}
}
void Editor_Html2Usfm::process_note_citation (pugi::xml_node& node)
{
// Remove the note citation from the main text body.
// It means that this:
// <span class="i-notecall1">1</span>
// becomes this:
// <span class="i-notecall1" />
const pugi::xml_node child = node.first_child ();
node.remove_child (child);
// Get more information about the note to retrieve.
// <span class="i-notecall1" />
std::string id = node.attribute ("class").value ();
id = filter::strings::replace ("call", "body", id);
// Sample footnote body.
// <p class="b-f"><span class="i-notebody1">1</span> + <span class="i-ft">notetext</span></p>
// Retrieve the <a> element from it.
// This was initially done through an XPath expression:
// https://www.grinninglizard.com/tinyxml2docs/index.html
// But XPath crashed on Android with libxml2.
// Therefore now it iterates over all the nodes to find the required element.
// After moving to pugixml, the XPath expression could have been used again, but this was not done.
pugi::xml_node note_p_element = get_note_pointer (m_document.first_child (), id);
if (note_p_element) {
// It now has the <p>.
// Remove the first <span> element.
// So we remain with:
// <p class="x"><span> </span><span>+ 2 Joh. 1.1</span></p>
{
pugi::xml_node node2 = note_p_element.first_child();
std::string name = node2.name ();
if (name != "span") {
// Normally the <span> is the first child in the <p> that is a note.
// But the user may have typed some text there.
// If so, then the <span> is the second child of the <p>.
// This code cares for that situation.
node2 = node2.next_sibling();
name = node2.name();
}
note_p_element.remove_child (node2);
}
// Preserve active character styles in the main text, and reset them for the note.
std::vector <std::string> preserved_character_styles = std::move(m_character_styles);
m_character_styles.clear();
// Process this 'p' element.
m_processing_note = true;
process_node(note_p_element);
m_processing_note = false;
// Restore the active character styles for the main text.
m_character_styles = std::move(preserved_character_styles);
// Remove this element so it can't be processed again.
pugi::xml_node parent = note_p_element.parent ();
parent.remove_child (note_p_element);
} else {
Database_Logs::log ("Discarding note with id " + id);
}
}
std::string Editor_Html2Usfm::clean_usfm (std::string usfm)
{
// Replace a double space after a note opener.
for (const std::string& noteOpener : m_note_openers) {
const std::string opener = filter::usfm::get_opening_usfm (noteOpener);
usfm = filter::strings::replace (opener + " ", opener, usfm);
}
// Unescape special XML characters.
usfm = filter::strings::unescape_special_xml_characters (usfm);
// Done.
return usfm;
}
void Editor_Html2Usfm::pre_process ()
{
m_output.clear ();
m_current_line.clear ();
m_mono = false;
m_word_level_attributes.clear();
m_milestone_attributes.clear();
// Remove the node for word-level attributes that was there only for visual appearance in the editors.
// Store the word-level attributes themselves in a container ready for use.
// And remove those nodes from the XML tree.
{
std::vector<pugi::xml_node> delete_nodes{};
pugi::xml_node body = m_document.first_child ();
for (pugi::xml_node& node : body.children()) {
const std::string classs = update_quill_class (node.attribute ("class").value ());
if (classs == quill::word_level_attributes_class) {
delete_nodes.push_back(node);
}
// The classs could be "wla1", and the prefix is "wla", so check on the match.
if (classs.find(quill::word_level_attribute_class_prefix) == 0) {
delete_nodes.push_back(node);
const std::string text = node.text().get();
m_word_level_attributes.insert({classs, text});
}
}
for (auto& node : delete_nodes) {
body.remove_child(node);
}
}
// Remove the node for milestone attributes that was there only for visual appearance in the editors.
// Store the milestone attributes themselves in a container ready for use.
// And remove those nodes from the XML tree.
{
std::vector<pugi::xml_node> delete_nodes{};
pugi::xml_node body = m_document.first_child ();
for (pugi::xml_node& node : body.children()) {
const std::string classs = update_quill_class (node.attribute ("class").value ());
if (classs == quill::milestone_attributes_class) {
delete_nodes.push_back(node);
}
// The classs could be "mls1", and the prefix is "mls", so check on the match.
if (classs.find(quill::milestone_attribute_class_prefix) == 0) {
delete_nodes.push_back(node);
const std::string text = node.text().get();
m_milestone_attributes.insert({classs, text});
}
}
for (auto& node : delete_nodes) {
body.remove_child(node);
}
}
}
void Editor_Html2Usfm::flush_line ()
{
if (!m_current_line.empty ()) {
// Trim so that '\p ' becomes '\p', for example.
m_current_line = filter::strings::trim (std::move(m_current_line));
// No longer doing the above
// because it would remove a space intentionally added to the end of a line.
// Instead it now only does a left trim instead of the full trim.
// current_line = filter::strings::ltrim (current_line);
m_output.push_back (std::move(m_current_line));
m_current_line.clear ();
}
}
void Editor_Html2Usfm::post_process ()
{
// Flush any last USFM line being built.
flush_line ();
// Log any word-level and milestone attributes that have not been integrated into the USFM.
for (const auto& element : m_word_level_attributes) {
Database_Logs::log ("Discarding unprocessed word-level attribute with key: " + element.first + " and value: " + element.second);
}
for (const auto& element : m_milestone_attributes) {
Database_Logs::log ("Discarding unprocessed milestone attribute with key: " + element.first + " and value: " + element.second);
}
}
// Retrieves a pointer to a relevant footnote element in the XML.
pugi::xml_node Editor_Html2Usfm::get_note_pointer (const pugi::xml_node& body, const std::string& id)
{
// The note wrapper node to look for.
pugi::xml_node p_note_wrapper;
// Check that there's a node to start with.
if (!body)
return p_note_wrapper;
// Assert that the <body> node is given.
if (std::string(body.name ()) != "body")
return p_note_wrapper;
// Some of the children of the <body> node will be the note wrappers.
// Consider this XML:
// <body>
// <p class="b-p">text<span class="i-notecall1" /></p>
// <p class="b-notes" />
// <p class="b-f"><span class="i-notebody1">1</span> + <span class="i-ft">foot</span></p>
// <p class="b-f"><span class="i-ft">note</span></p>
// </body>
// There is node <p class="b-notes" />.
// Any children of <body> following the above node are all note wrappers.
// Here the code is going to get the correct note wrapper node.
// In addition to finding the correct p node, it also looks for subsequent p nodes
// that belong to the main p node.
// See issue https://github.com/bibledit/cloud/issues/444.
// It handles a situation that the user presses <Enter> while in a note.
// The solution is to include the next p node too if it belongs to the correct note wrapper p node.
bool within_matching_p_node = false;
for (pugi::xml_node p_body_child : body.children ()) {
pugi::xml_node span_notebody = p_body_child.first_child();
std::string name = span_notebody.name ();
if (name != "span") {
// Normally the <span> is the first child in the <p> that is a note.
// But the user may have typed some text there.
// If so, then the <span> is the second child of the <p>.
// This code cares for that situation.
span_notebody = span_notebody.next_sibling();
name = span_notebody.name();
}
if (name == "span") {
const std::string classs = span_notebody.attribute ("class").value ();
if (classs.substr (0, 10) == id.substr(0, 10)) {
if (classs == id) {
within_matching_p_node = true;
} else {
within_matching_p_node = false;
}
}
}
if (within_matching_p_node) {
if (!p_note_wrapper) {
p_note_wrapper = p_body_child;
} else {
for (pugi::xml_node child = p_body_child.first_child(); child; child = child.next_sibling()) {
p_note_wrapper.append_copy(child);
}
}
}
}
// If a note wrapper was found, return that.
// If nothing was found, the note wrapper is null.
return p_note_wrapper;
}
std::string Editor_Html2Usfm::update_quill_class (std::string classname)
{
classname = filter::strings::replace (quill::class_prefix_block, std::string(), std::move(classname));
classname = filter::strings::replace (quill::class_prefix_inline, std::string(), std::move(classname));
classname = quill::underscore_to_hyphen (std::move(classname));
return classname;
}
// This function takes the html from a Quill-based editor that edits one verse,
// and converts it to USFM.
// It properly deals with cases when a verse does not start a new paragraph.
std::string editor_export_verse_quill (const std::string& stylesheet, std::string html)
{
// When the $html starts with a paragraph without a style,
// put a recognizable style there.
const std::string one_verse_style = "oneversestyle";
const size_t pos = html.find ("<p>");
if (pos == 0) {
html.insert (2, R"( class=")" + std::string(quill::class_prefix_block) + one_verse_style + R"(")");
}
// Convert html to USFM.
Editor_Html2Usfm editor_export;
editor_export.load (html);
editor_export.stylesheet (stylesheet);
editor_export.run ();
std::string usfm = editor_export.get ();
// Remove that recognizable style converted to USFM.
usfm = filter::strings::replace (R"(\)" + one_verse_style, std::string(), usfm);
usfm = filter::strings::trim (usfm);
return usfm;
}
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