File size: 3,898 Bytes
bee6636 |
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 |
use std::cell::RefCell;
use oxc::{
allocator::{Allocator, Vec},
ast_visit::Visit,
diagnostics::OxcDiagnostic,
parser::{ParseOptions, Parser},
span::SourceType,
};
use thiserror::Error;
pub mod cfg;
mod changes;
mod rewrite;
mod visitor;
use cfg::{Config, Flags, UrlRewriter};
use changes::JsChanges;
use visitor::Visitor;
#[derive(Error, Debug)]
pub enum RewriterError {
#[error("transformer error: {0}")]
Transformer(#[from] transform::TransformError),
#[error("url rewriter error: {0}")]
Url(Box<dyn std::error::Error + Sync + Send>),
#[error("formatting error: {0}")]
Formatting(#[from] std::fmt::Error),
#[error("oxc panicked in parser: {0}")]
OxcPanicked(String),
#[error("Already rewriting")]
AlreadyRewriting,
#[error("Not rewriting")]
NotRewriting,
#[error("Changes left over")]
Leftover,
}
#[derive(Debug)]
pub struct RewriteResult<'alloc> {
pub js: Vec<'alloc, u8>,
pub sourcemap: Vec<'alloc, u8>,
pub errors: std::vec::Vec<OxcDiagnostic>,
pub flags: Flags,
}
pub struct Rewriter<E: UrlRewriter> {
cfg: Config,
url: E,
changes: RefCell<Option<JsChanges<'static, 'static>>>,
}
impl<E: UrlRewriter> Rewriter<E> {
fn take_changes<'alloc: 'data, 'data>(
&'data self,
alloc: &'alloc Allocator,
) -> Result<JsChanges<'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::<JsChanges<'static, 'static>, JsChanges<'alloc, 'data>>(x)
};
x.set_alloc(alloc)?;
Ok(x)
})
}
fn put_changes<'alloc: 'data, 'data>(
&'data self,
mut changes: JsChanges<'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::<JsChanges<'alloc, 'data>, JsChanges<'static, 'static>>(
changes,
)
};
slot.replace(changes);
Ok(())
}
}
pub fn new(cfg: Config, url_rewriter: E) -> Self {
Self {
cfg,
url: url_rewriter,
changes: RefCell::new(Some(JsChanges::new())),
}
}
pub fn rewrite<'alloc: 'data, 'data>(
&'data self,
alloc: &'alloc Allocator,
js: &'data str,
flags: Flags,
) -> Result<RewriteResult<'alloc>, RewriterError> {
let source_type = SourceType::unambiguous()
.with_javascript(true)
.with_module(flags.is_module)
.with_standard(true);
let parsed = Parser::new(alloc, js, source_type)
.with_options(ParseOptions {
allow_v8_intrinsics: true,
allow_return_outside_function: true,
..Default::default()
})
.parse();
if parsed.panicked {
use std::fmt::Write;
let mut errors = String::new();
for error in parsed.errors {
writeln!(errors, "{error}")?;
}
return Err(RewriterError::OxcPanicked(errors));
}
let jschanges = self.take_changes(alloc)?;
let mut visitor = Visitor {
alloc,
jschanges,
error: None,
config: &self.cfg,
rewriter: &self.url,
flags,
};
visitor.visit_program(&parsed.program);
if let Some(error) = visitor.error {
return Err(RewriterError::Url(error));
}
let mut jschanges = visitor.jschanges;
let changed = jschanges.perform(js, &self.cfg, &visitor.flags)?;
self.put_changes(jschanges)?;
let js: Vec<'alloc, u8> = changed.source;
let sourcemap: Vec<'alloc, u8> = changed.map;
Ok(RewriteResult {
js,
sourcemap,
errors: parsed.errors,
flags: visitor.flags,
})
}
}
|