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use std::{cell::RefCell, error::Error, num::TryFromIntError};
use changes::HtmlChanges;
use oxc::allocator::Allocator;
use rule::RewriteRule;
use thiserror::Error;
use tl::ParserOptions;
use visitor::Visitor;
mod changes;
pub mod rule;
mod visitor;
pub use visitor::{VisitorExternalTool, VisitorExternalToolCallback};
#[derive(Debug, Error)]
pub enum RewriterError {
#[error("tl: {0}")]
Tl(#[from] tl::ParseError),
#[error("transformer: {0}")]
Transformer(#[from] transform::TransformError),
#[error("rewrite function: {0}")]
Rewrite(Box<dyn Error + Sync + Send>),
#[error("external tool function: {0}")]
ExternalTool(Box<dyn Error + Sync + Send>),
#[error("external tool didn't return anything")]
ExternalToolEmpty,
#[error("Not utf8")]
NotUtf8,
#[error("usize too big")]
ConversionFailed(#[from] TryFromIntError),
#[error("Already rewriting")]
AlreadyRewriting,
#[error("Not rewriting")]
NotRewriting,
#[error("Changes left over")]
Leftover,
}
pub struct Rewriter<T> {
rules: Vec<RewriteRule<T>>,
external_tool: VisitorExternalToolCallback<T>,
changes: RefCell<Option<HtmlChanges<'static, 'static>>>,
}
impl<T> Rewriter<T> {
pub fn new(
rules: Vec<RewriteRule<T>>,
external_tool: VisitorExternalToolCallback<T>,
) -> Result<Self, RewriterError> {
Ok(Self {
rules,
external_tool,
changes: RefCell::new(Some(HtmlChanges::new())),
})
}
fn take_changes<'alloc: 'data, 'data>(
&'data self,
alloc: &'alloc Allocator,
) -> Result<HtmlChanges<'alloc, 'data>, RewriterError> {
let mut slot = self
.changes
.try_borrow_mut()
.map_err(|_| RewriterError::AlreadyRewriting)?;
slot.take()
.ok_or(RewriterError::AlreadyRewriting)
.and_then(|x| {
let mut x = unsafe {
std::mem::transmute::<HtmlChanges<'static, 'static>, HtmlChanges<'alloc, 'data>>(
x,
)
};
x.set_alloc(alloc)?;
Ok(x)
})
}
fn put_changes<'alloc: 'data, 'data>(
&'data self,
mut changes: HtmlChanges<'alloc, 'data>,
) -> Result<(), RewriterError> {
if !changes.empty() {
return Err(RewriterError::Leftover);
}
let mut slot = self
.changes
.try_borrow_mut()
.map_err(|_| RewriterError::AlreadyRewriting)?;
if slot.is_some() {
Err(RewriterError::NotRewriting)
} else {
changes.take_alloc()?;
let changes = unsafe {
std::mem::transmute::<HtmlChanges<'alloc, 'data>, HtmlChanges<'static, 'static>>(
changes,
)
};
slot.replace(changes);
Ok(())
}
}
pub fn rewrite<'alloc: 'data, 'data>(
&'data self,
alloc: &'alloc Allocator,
html: &'data str,
data: &T,
from_top: bool,
) -> Result<oxc::allocator::Vec<'alloc, u8>, RewriterError> {
let tree = tl::parse(html, ParserOptions::default())?;
let mut changes = self.take_changes(alloc)?;
let visitor = Visitor {
alloc,
rules: &self.rules,
external_tool_func: &self.external_tool,
rule_data: data,
data: html,
tree,
from_top,
};
visitor.rewrite(&mut changes)?;
let res = changes.perform(html)?;
self.put_changes(changes)?;
Ok(res.source)
}
}
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