101 lines
2.9 KiB
Rust
101 lines
2.9 KiB
Rust
use dioxus_core::prelude::*;
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use std::fmt::Write;
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pub struct StringCache {
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pub segments: Vec<Segment>,
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pub template: Template<'static>,
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}
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#[derive(Default)]
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pub struct StringChain {
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pub segments: Vec<Segment>,
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}
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub enum Segment {
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Attr(usize),
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Node(usize),
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PreRendered(String),
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}
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impl std::fmt::Write for StringChain {
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fn write_str(&mut self, s: &str) -> std::fmt::Result {
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match self.segments.last_mut() {
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Some(Segment::PreRendered(s2)) => s2.push_str(s),
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_ => self.segments.push(Segment::PreRendered(s.to_string())),
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}
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Ok(())
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}
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}
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impl StringCache {
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pub fn from_template(template: &VNode) -> Result<Self, std::fmt::Error> {
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let mut chain = StringChain::default();
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let mut cur_path = vec![];
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for (root_idx, root) in template.template.roots.iter().enumerate() {
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Self::recurse(root, &mut cur_path, root_idx, &mut chain)?;
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}
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Ok(Self {
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segments: chain.segments,
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template: template.template,
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})
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}
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fn recurse(
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root: &TemplateNode,
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cur_path: &mut Vec<usize>,
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root_idx: usize,
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chain: &mut StringChain,
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) -> Result<(), std::fmt::Error> {
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match root {
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TemplateNode::Element {
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tag,
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attrs,
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children,
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..
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} => {
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cur_path.push(root_idx);
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write!(chain, "<{}", tag)?;
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for attr in *attrs {
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match attr {
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TemplateAttribute::Static { name, value, .. } => {
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write!(chain, " {}=\"{}\"", name, value)?;
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}
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TemplateAttribute::Dynamic(index) => {
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chain.segments.push(Segment::Attr(*index))
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}
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}
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}
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if children.len() == 0 && tag_is_self_closing(tag) {
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write!(chain, "/>")?;
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} else {
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write!(chain, ">")?;
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for child in *children {
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Self::recurse(child, cur_path, root_idx, chain)?;
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}
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write!(chain, "</{}>", tag)?;
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}
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cur_path.pop();
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}
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TemplateNode::Text(text) => write!(chain, "{}", text)?,
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TemplateNode::Dynamic(idx) | TemplateNode::DynamicText(idx) => {
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chain.segments.push(Segment::Node(*idx))
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}
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}
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Ok(())
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}
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}
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fn tag_is_self_closing(tag: &str) -> bool {
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match tag {
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"area" | "base" | "br" | "col" | "embed" | "hr" | "img" | "input" | "link" | "meta"
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| "param" | "source" | "track" | "wbr" => true,
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_ => false,
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}
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}
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