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LibWeb: Implement document.execCommand('insertLinebreak')

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Jelle Raaijmakers 2024-12-10 16:16:56 +01:00 • committed by Jelle Raaijmakers
commit 495006ddb5
Notes: github-actions[bot] 2024-12-10 18:35:28 +00:00
4 changed files with 127 additions and 0 deletions
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77
Libraries/LibWeb/Editing/Commands.cpp
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@ -19,6 +19,7 @@
#include <LibWeb/HTML/HTMLImageElement.h>
#include <LibWeb/HTML/HTMLLIElement.h>
#include <LibWeb/HTML/HTMLTableElement.h>
#include <LibWeb/Layout/Node.h>
#include <LibWeb/Namespace.h>
namespace Web::Editing {
@ -374,6 +375,81 @@ bool command_delete_action(DOM::Document& document, String const&)
return true;
}
// https://w3c.github.io/editing/docs/execCommand/#the-insertlinebreak-command
bool command_insert_linebreak_action(DOM::Document& document, String const&)
{
// 1. Delete the selection, with strip wrappers false.
auto& selection = *document.get_selection();
delete_the_selection(selection, true, false);
// 2. If the active range's start node is neither editable nor an editing host, return true.
auto& active_range = *selection.range();
auto start_node = active_range.start_container();
if (!start_node->is_editable_or_editing_host())
return true;
// 3. If the active range's start node is an Element, and "br" is not an allowed child of it, return true.
if (is<DOM::Element>(*start_node) && !is_allowed_child_of_node(HTML::TagNames::br, start_node))
return true;
// 4. If the active range's start node is not an Element, and "br" is not an allowed child of the active range's
// start node's parent, return true.
if (!is<DOM::Element>(*start_node) && start_node->parent() && !is_allowed_child_of_node(HTML::TagNames::br, GC::Ref { *start_node->parent() }))
return true;
// 5. If the active range's start node is a Text node and its start offset is zero, call collapse() on the context
// object's selection, with first argument equal to the active range's start node's parent and second argument
// equal to the active range's start node's index.
if (is<DOM::Text>(*start_node) && active_range.start_offset() == 0)
MUST(selection.collapse(start_node->parent(), start_node->index()));
// 6. If the active range's start node is a Text node and its start offset is the length of its start node, call
// collapse() on the context object's selection, with first argument equal to the active range's start node's
// parent and second argument equal to one plus the active range's start node's index.
if (is<DOM::Text>(*start_node) && active_range.start_offset() == start_node->length())
MUST(selection.collapse(start_node->parent(), start_node->index() + 1));
// AD-HOC: If the active range's start node is a Text node and its resolved value for "white-space" is one of "pre",
// "pre-line" or "pre-wrap":
// * Insert a newline (\n) character at the active range's start offset;
// * Collapse the selection with active range's start node as the first argument and one plus active range's
// start offset as the second argument
// * Insert another newline (\n) character if the active range's start offset is equal to the length of the
// active range's start node.
// * Return true.
if (is<DOM::Text>(*start_node) && start_node->layout_node()) {
auto& text_node = static_cast<DOM::Text&>(*start_node);
auto white_space = text_node.layout_node()->computed_values().white_space();
if (first_is_one_of(white_space, CSS::WhiteSpace::Pre, CSS::WhiteSpace::PreLine, CSS::WhiteSpace::PreWrap)) {
MUST(text_node.insert_data(active_range.start_offset(), "\n"_string));
MUST(selection.collapse(start_node, active_range.start_offset() + 1));
if (selection.range()->start_offset() == start_node->length())
MUST(text_node.insert_data(active_range.start_offset(), "\n"_string));
return true;
}
}
// 7. Let br be the result of calling createElement("br") on the context object.
auto br = MUST(DOM::create_element(document, HTML::TagNames::br, Namespace::HTML));
// 8. Call insertNode(br) on the active range.
MUST(active_range.insert_node(br));
// 9. Call collapse() on the context object's selection, with br's parent as the first argument and one plus br's
// index as the second argument.
MUST(selection.collapse(br->parent(), br->index() + 1));
// 10. If br is a collapsed line break, call createElement("br") on the context object and let extra br be the
// result, then call insertNode(extra br) on the active range.
if (is_collapsed_line_break(br)) {
auto extra_br = MUST(DOM::create_element(document, HTML::TagNames::br, Namespace::HTML));
MUST(active_range.insert_node(extra_br));
}
// 11. Return true.
return true;
}
// https://w3c.github.io/editing/docs/execCommand/#the-insertparagraph-command
bool command_insert_paragraph_action(DOM::Document& document, String const&)
{
@ -705,6 +781,7 @@ bool command_style_with_css_state(DOM::Document const& document)
static Array const commands {
CommandDefinition { CommandNames::delete_, command_delete_action, {}, {}, {} },
CommandDefinition { CommandNames::defaultParagraphSeparator, command_default_paragraph_separator_action, {}, {}, command_default_paragraph_separator_value },
CommandDefinition { CommandNames::insertLineBreak, command_insert_linebreak_action, {}, {}, {} },
CommandDefinition { CommandNames::insertParagraph, command_insert_paragraph_action, {}, {}, {} },
CommandDefinition { CommandNames::styleWithCSS, command_style_with_css_action, {}, command_style_with_css_state, {} },
};