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use std::str::FromStr;
use crate::parse::{
element::{Extraction, HtmlUrlExpander},
remove_surrounding_whitespace,
};
#[cfg(feature = "picture")]
use crate::parse::picture::PictureParser;
use super::*;
use html_escape::decode_html_entities;
pub(crate) struct PropertyParser {
pub(crate) elem: ElementPtr,
kind: DeclKind,
base_url: Url,
parent: Option<ElementPtr>,
}
impl std::fmt::Debug for PropertyParser {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> swc_html_codegen::Result {
f.debug_struct("PropertyParser")
.field("forKind", &self.kind)
.finish()
}
}
impl PropertyParser {
#[tracing::instrument(level = "trace", ret)]
pub(crate) fn new(
elem: ElementPtr,
kind: DeclKind,
base_url: Url,
parent: Option<ElementPtr>,
) -> Self {
Self {
elem,
kind,
base_url,
parent,
}
}
/// Checks if this property is within an h-review microformat context.
///
/// This is used to implement backward compatibility mappings for h-review,
/// specifically the normalization of e-description (legacy) to e-content (current spec).
/// See: https://microformats.org/wiki/h-review
fn is_in_h_review_context(&self) -> bool {
if let Some(parent) = &self.parent {
return parent.node.root_classes().iter().any(|class| {
matches!(
class,
microformats_types::Class::Known(microformats_types::KnownClass::Review)
)
});
}
false
}
#[tracing::instrument(level = "trace", skip(self), ret)]
fn expand_plain_property_value(&self) -> Result<Option<PropertyValue>, crate::parse::Error> {
let elem = &self.elem.node;
// 1: Check for VCP first; use if found.
Ok(value_class::ValueClassPropertyExtractor {
element: Arc::clone(&self.elem),
hint: value_class::TypeHint::Plain,
}
.extract_value_class(&self.base_url)?
.filter(non_empty_property_value)
// 2. If abbr.p-x[title] or link.p-x[title], return the title attribute.
.or_else(|| {
elem.attr("title")
.filter(|_| ["abbr", "link"].contains(&elem.tag()))
.filter(non_empty_string)
.map(|s| PropertyValue::Plain(TextValue::new(s)))
})
// 3. else if data.p-x[value] or input.p-x[value], then return the value attribute
.or_else(|| {
elem.attr("value")
.filter(|_| ["data"].contains(&elem.tag()))
.filter(non_empty_string)
.map(|s| PropertyValue::Plain(TextValue::new(s)))
})
// 4. else if img.p-x[alt] or area.p-x[alt], then return the alt attribute
.or_else(|| {
elem.attr("alt")
.filter(|_| ["img", "area"].contains(&elem.tag()))
.filter(non_empty_string)
.map(|s| PropertyValue::Plain(TextValue::new(s)))
})
// 5. else if picture.p-x[alt], then return the alt attribute from fallback img
.or_else(|| {
#[cfg(feature = "picture")]
{
if elem.tag() == "picture" {
let picture_parser = PictureParser::new();
if let Ok(Some(PropertyValue::Image(image))) =
picture_parser.parse_image_element(elem, &self.base_url)
{
return image
.alt
.map(|alt| PropertyValue::Plain(TextValue::new(alt)));
}
}
}
None
})
// 6. else return the textContent of the element
.or_else(|| {
elem.text_content_with_img_links(&self.base_url)
.ok()
.map(|Extraction { text, .. }| PropertyValue::Plain(TextValue::new(text)))
}))
.map(|value_opt| {
value_opt.map(|value| {
if let PropertyValue::Plain(plain_text_value) = value {
PropertyValue::Plain(TextValue::new(remove_surrounding_whitespace(
plain_text_value.to_string(),
)))
} else {
value
}
})
})
}
fn expand_linked_property_value(&self) -> Option<PropertyValue> {
let node = &self.elem.node;
// 1. if a.u-x[href] or area.u-x[href] or link.u-x[href], then get the href attribute
let text_value = node
.attr("href")
.filter(|_| ["a", "area", "link"].contains(&node.tag()))
.or_else(|| {
// 3. else if audio.u-x[src] or video.u-x[src] or source.u-x[src] or iframe.u-x[src], then get the src attribute
node.attr("src")
.filter(|_| ["audio", "video", "source", "iframe"].contains(&node.tag()))
})
.or_else(|| {
// 4. else if video.u-x[poster], then get the poster attribute
node.attr("poster")
.filter(non_empty_string)
.filter(|_| ["video"].contains(&node.tag()))
})
.or_else(|| {
// 5. else if object.u-x[data], then get the data attribute
node.attr("data")
.filter(non_empty_string)
.filter(|_| ["object"].contains(&node.tag()))
})
.or_else(|| {
// 6. else parse the element for the value-class-pattern. If a value is found, get it
// TODO: Refactor this to properly throw an exception.
if let Some(PropertyValue::Plain(value)) =
(value_class::ValueClassPropertyExtractor {
element: Arc::clone(&self.elem),
hint: value_class::TypeHint::Plain,
}
.extract_value_class(&self.base_url)
.ok()
.flatten()
.filter(non_empty_property_value))
{
Some(value.to_string())
} else {
None
}
})
.or_else(|| {
// 7. else if abbr.u-x[title], then get the title attribute
node.attr("title")
.filter(non_empty_string)
.filter(|_| ["abbr"].contains(&node.tag()))
})
.or_else(|| {
// 8. else if data.u-x[value] or input.u-x[value], then get the value attribute
node.attr("value")
.filter(non_empty_string)
.filter(|_| ["input", "data"].contains(&node.tag()))
})
.or_else(|| {
// 9. else get the textContent of the element after removing all leading/trailing spaces and nested <script> & <style> elements
node.text_content(&self.base_url).ok().map(Into::into)
});
let linked_text = text_value.unwrap_or_default();
if node.tag() == "picture" {
// Picture element processing - delegate to picture parser
#[cfg(feature = "picture")]
{
let picture_parser = PictureParser::new();
if let Ok(Some(property_value)) =
picture_parser.parse_image_element(node, &self.base_url)
{
Some(property_value)
} else {
// Fallback to text content if picture parsing fails
if let Ok(u) = self.base_url.join(&linked_text) {
Some(PropertyValue::Url(UrlValue::new(u)))
} else {
Some(PropertyValue::Plain(TextValue::new(linked_text)))
}
}
}
#[cfg(not(feature = "picture"))]
{
// Fallback to text content when picture feature is not enabled
if let Ok(u) = self.base_url.join(&linked_text) {
Some(PropertyValue::Url(UrlValue::new(u)))
} else {
Some(PropertyValue::Plain(TextValue::new(linked_text)))
}
}
} else if node.tag() == "img" {
// 2. image processing
extract_img_element(node, &self.base_url)
} else if let Ok(u) = self.base_url.join(&linked_text) {
Some(PropertyValue::Url(UrlValue::new(u)))
} else {
Some(PropertyValue::Plain(TextValue::new(linked_text)))
}
}
#[tracing::instrument(level = "trace", skip(self), ret)]
fn expand_temporal_property_value(&self) -> Result<Option<PropertyValue>, crate::parse::Error> {
let elem = &self.elem.node;
// 1. parse the element for the value-class-pattern, including the date and time parsing rules. If a value is found, then return it.
let vcp_value = value_class::ValueClassPropertyExtractor {
element: Arc::clone(&self.elem),
hint: value_class::TypeHint::Temporal,
}
.extract_value_class(&self.base_url)?;
if vcp_value.is_none() {
// 2. if time.dt-x[datetime] or ins.dt-x[datetime] or del.dt-x[datetime], then return the datetime attribute
let text_value = elem
.attr("datetime")
.filter(|_| ["time", "ins", "del"].contains(&elem.tag()))
.filter(non_empty_string)
.or_else(|| {
// 3. else if abbr.dt-x[title], then return the title attribute
elem.attr("title")
.filter(|_| ["abbr"].contains(&elem.tag()))
.filter(non_empty_string)
})
.or_else(|| {
// 4. else if data.dt-x[value] or input.dt-x[value], then return the value attribute
elem.attr("value")
.filter(|_| ["data", "input"].contains(&elem.tag()))
.filter(non_empty_string)
});
let dt_str = if let Some(v) = text_value {
v
} else {
// 5. else return the textContent of the element after removing all leading/trailing spaces and nested <script> & <style> elements.
elem.text_content(&self.base_url).map(Into::into)?
};
Ok(
if let Ok(value) = microformats_types::temporal::Value::from_str(&dt_str) {
Some(PropertyValue::Temporal(value)).filter(non_empty_property_value)
} else {
Some(PropertyValue::Plain(TextValue::new(dt_str)))
.filter(non_empty_property_value)
},
)
} else {
Ok(vcp_value)
}
}
#[tracing::instrument(level = "trace", skip(self), ret)]
fn get_embedded_html(&self) -> Result<PropertyValue, crate::parse::Error> {
let raw_html = self.elem.node.html_content()?;
let html = HtmlUrlExpander::expand_urls_in_html_string(&raw_html, &self.base_url)?;
let Extraction {
text: raw_value,
links,
} = self.elem.node.text_content_with_img_links(&self.base_url)?;
Ok(PropertyValue::Fragment(Fragment::new(
html,
decode_html_entities(&remove_surrounding_whitespace(raw_value)).to_string(),
links,
#[cfg(feature = "per_element_lang")]
self.elem.node.attr("lang"),
)))
}
#[tracing::instrument(level = "trace", skip(self), ret)]
pub(crate) fn expand(&self) -> Result<Option<(String, PropertyValue)>, crate::parse::Error> {
Ok(match &self.kind {
DeclKind::Root(_) => unreachable!(),
DeclKind::Plain(prop_name) => self
.expand_plain_property_value()?
.map(|plain_text| (prop_name.to_owned(), plain_text)),
DeclKind::Linked(prop_name) => self
.expand_linked_property_value()
.map(|linkable_value| (prop_name.to_owned(), linkable_value)),
DeclKind::Temporal(prop_name) => self
.expand_temporal_property_value()?
.map(|temporal_value| (prop_name.to_owned(), temporal_value)),
DeclKind::Hypertext(prop_name) => {
// Special h-review mapping: normalize property names to match current spec
//
// Per https://microformats.org/wiki/h-review (Backward Compatibility section):
// - e-description (legacy) should parse as e-content
// - e-content (current) is the canonical property name
//
// Both map to output property name "content" for consistency with the spec.
// This ensures backward compatibility with existing markup while following
// current microformats standards.
let final_prop_name = if self.is_in_h_review_context() && prop_name == "description"
{
"content".to_owned()
} else {
prop_name.to_owned()
};
Some((final_prop_name, self.get_embedded_html()?))
}
})
}
}
#[cfg(test)]
mod test;