1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142

#![allow(clippy::unneeded_field_pattern)]
#![doc(html_root_url = "https://docs.rs/lignin-html/0.0.1")]
#![forbid(unsafe_code)]
#![warn(clippy::pedantic)]

#[cfg(doctest)]
pub mod readme {
	doc_comment::doctest!("../README.md");
}

use core::fmt::{Error as fmtError, Write};
pub use lignin;
use lignin::{
	Attribute, Element as lElement,
	Node::{self, Comment, Element, Multi, Ref, Text},
};
use std::error::Error as stdError;
use v_htmlescape::escape;

#[cfg(feature = "remnants")]
use lignin::Node::RemnantSite;
#[cfg(feature = "remnants")]
use lignin::{bumpalo::Bump, remnants::RemnantSite as rRemnantSite};

#[allow(clippy::missing_errors_doc)]
pub fn render<'a>(
	w: &mut impl Write,
	vdom: &'a Node<'a>,
	#[cfg(feature = "remnants")] bump: &'a Bump,
) -> Result<(), Error<'a>> {
	match vdom {
		&Comment(comment) => {
			write!(w, "<!--{}-->", escape(comment))?;
		}

		&Element(lElement {
			name: element_name,
			ref attributes,
			ref content,
			event_bindings: _,
		}) => {
			write!(w, "<{}", validate_element_name(element_name)?)?;
			for Attribute {
				name: attribute_name,
				value,
			} in &**attributes
			{
				write!(
					w,
					" {}=\"{}\"",
					validate_attribute_name(attribute_name)?,
					escape_attribute_value(value),
				)?;
			}
			w.write_char('>')?;
			for node in *content {
				render(
					w,
					node,
					#[cfg(feature = "remnants")]
					bump,
				)?;
			}
			//TODO: Fill out the blacklist here.
			if !["BR"].contains(element_name) {
				write!(w, "</{}>", element_name)?;
			}
		}

		Ref(target) => render(
			w,
			target,
			#[cfg(feature = "remnants")]
			bump,
		)?,
		Multi(nodes) => {
			for node in *nodes {
				render(
					w,
					node,
					#[cfg(feature = "remnants")]
					bump,
				)?;
			}
		}
		Text(text) => write!(
			w,
			"{}",
			text.replace("<", "&lt;") //TODO: Check if this is enough.
		)?,
		#[cfg(feature = "remnants")]
		RemnantSite(rRemnantSite { content, .. }) => {
			render(w, content, bump)?;
		}
		other => return Err(Error::Unsupported(other)),
	};
	Ok(())
}

#[non_exhaustive]
pub enum Error<'a> {
	Unsupported(&'a Node<'a>),
	InvalidAttributeName,
	InvalidElementName,
	Format(fmtError),
	Other(Box<dyn stdError>),
}

impl<'a> From<fmtError> for Error<'a> {
	fn from(fmtError: fmtError) -> Self {
		Self::Format(fmtError)
	}
}

impl<'a> From<Box<dyn stdError>> for Error<'a> {
	fn from(std_error: Box<dyn stdError>) -> Self {
		Self::Other(std_error)
	}
}

fn validate_element_name(value: &str) -> Result<&str, Error> {
	if value.contains(|c| c == '>') {
		Err(Error::InvalidElementName) //TODO
	} else {
		Ok(value)
	}
}

fn validate_attribute_name(value: &str) -> Result<&str, Error> {
	if value.contains(|c| c == '>') {
		Err(Error::InvalidAttributeName) //TODO
	} else {
		Ok(value)
	}
}

fn escape_attribute_value(value: &str) -> String {
	if value.contains('"') {
		todo!("Attribute value escapes")
	}
	value.to_owned()
}