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use std::{cell::RefCell, rc::Rc};
use crate::{
XMLVersion,
tree::{
Document, NodeType, XMLTreeError,
node::{Node, NodeCore, NodeSpec},
},
};
/// Processing instruction node spec.
pub struct ProcessingInstructionSpec {
target: Rc<str>,
data: Option<Rc<str>>,
}
impl NodeSpec for ProcessingInstructionSpec {
fn node_type(&self) -> NodeType {
NodeType::ProcessingInstruction
}
fn first_child(&self) -> Option<Rc<RefCell<NodeCore<dyn NodeSpec>>>> {
None
}
fn last_child(&self) -> Option<Rc<RefCell<NodeCore<dyn NodeSpec>>>> {
None
}
}
/// The leaf node of the document tree that represents a processing instruction of the XML document.
///
/// It mostly covers the information provided by the "Processing Instruction Information Item"
/// in the [XML Infoset](https://www.w3.org/TR/xml-infoset/).
///
/// # Reference
/// [2.4. Processing Instruction Information Items](https://www.w3.org/TR/xml-infoset/#infoitem.pi)
pub type ProcessingInstruction = Node<ProcessingInstructionSpec>;
impl ProcessingInstruction {
pub(crate) fn new(
target: Rc<str>,
data: Option<Rc<str>>,
owner_document: Document,
) -> Result<Self, XMLTreeError> {
if !XMLVersion::XML10.validate_name(&target) || target.eq_ignore_ascii_case("xml") {
return Err(XMLTreeError::InvalidPITarget);
}
if data.as_deref().is_some_and(|d| {
d.contains("?>") || d.contains(|c: char| !XMLVersion::XML10.is_char(c))
}) {
return Err(XMLTreeError::UnacceptableCharacter);
}
Ok(Node::create_node(
ProcessingInstructionSpec { target, data },
owner_document,
))
}
/// The target name of this processing instruction.
pub fn target(&self) -> Rc<str> {
self.core.borrow().spec.target.clone()
}
/// The data of this processing instruction.
pub fn data(&self) -> Option<Rc<str>> {
self.core.borrow().spec.data.clone()
}
/// Create new node and copy internal data to the new node.
///
/// While [`Clone::clone`] merely copies the pointer, this method copies the internal data
/// to new memory, creating a completely different node. Comparing the source node and
/// the new node using [`Node::is_same_node`] will always return `false`.
///
/// # Example
/// ```rust
/// use anyxml::tree::Document;
///
/// let document = Document::new();
/// let pi1 = document.create_processing_instruction("target", Some("data".into())).unwrap();
/// let pi2 = pi1.deep_copy();
/// assert!(pi1.is_same_node(pi1.clone()));
/// assert_eq!(pi1.target(), pi2.target());
/// assert_eq!(pi1.data(), pi2.data());
/// assert!(!pi1.is_same_node(pi2));
/// ```
pub fn deep_copy(&self) -> Self {
Node::create_node(
ProcessingInstructionSpec {
target: self.target(),
data: self.data(),
},
self.owner_document(),
)
}
}
impl std::fmt::Display for ProcessingInstruction {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "<?{}", self.target())?;
if let Some(data) = self.data() {
write!(f, " {}", data)?;
}
write!(f, "?>")
}
}