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use std::{error::Error, str::FromStr};
use anyhow::{Context, Result};
use bytes::Buf;
use js::{
RewriteResult, Rewriter,
cfg::{Config, Flags, UrlRewriter},
};
use oxc::allocator::{Allocator, StringBuilder};
use url::Url;
use urlencoding::encode;
use crate::RewriterOptions;
struct NativeUrlRewriter;
impl UrlRewriter for NativeUrlRewriter {
fn rewrite(
&self,
_cfg: &Config,
flags: &Flags,
url: &str,
builder: &mut StringBuilder,
_module: bool,
) -> Result<(), Box<dyn Error + Sync + Send>> {
let base = Url::from_str(&flags.base)?;
builder.push_str(encode(base.join(url)?.as_str()).as_ref());
Ok(())
}
}
#[derive(Debug)]
enum RewriteType<'a> {
Insert { pos: u32, size: u32 },
Replace { start: u32, end: u32, str: &'a [u8] },
}
pub struct NativeRewriter {
alloc: Allocator,
rewriter: Rewriter<NativeUrlRewriter>,
}
impl NativeRewriter {
#[allow(dead_code)]
pub fn default() -> Self {
Self::new(&RewriterOptions::default())
}
pub fn new(cfg: &RewriterOptions) -> Self {
let rewriter = Rewriter::new(
Config {
prefix: cfg.prefix.clone(),
wrapfn: cfg.wrapfn.clone(),
wrapthisfn: cfg.wrapthisfn.clone(),
importfn: cfg.importfn.clone(),
rewritefn: cfg.rewritefn.clone(),
metafn: cfg.metafn.clone(),
setrealmfn: cfg.setrealmfn.clone(),
pushsourcemapfn: cfg.pushsourcemapfn.clone(),
},
NativeUrlRewriter,
);
Self {
alloc: Allocator::new(),
rewriter,
}
}
#[allow(dead_code)]
pub fn rewrite_default(&self, data: &str) -> Result<RewriteResult<'_>> {
self.rewrite(data, &RewriterOptions::default())
}
pub fn rewrite(&self, data: &str, cfg: &RewriterOptions) -> Result<RewriteResult<'_>> {
self.rewriter
.rewrite(
&self.alloc,
data,
Flags {
base: cfg.base.clone(),
sourcetag: cfg.sourcetag.clone(),
is_module: cfg.is_module,
capture_errors: cfg.capture_errors,
do_sourcemaps: cfg.do_sourcemaps,
scramitize: cfg.scramitize,
strict_rewrites: cfg.strict_rewrites,
},
)
.context("failed to rewrite file")
}
pub fn reset(&mut self) {
self.alloc.reset();
}
pub fn unrewrite(res: &RewriteResult) -> Vec<u8> {
let js = res.js.as_slice();
let mut map = res.sourcemap.as_slice();
let rewrite_cnt = map.get_u32_le();
let mut rewrites = Vec::with_capacity(rewrite_cnt as usize);
for x in 0..rewrite_cnt {
let pos = map.get_u32_le();
let size = map.get_u32_le();
let ty = map.get_u8();
if ty == 0 {
rewrites.push(RewriteType::Insert { pos, size });
} else if ty == 1 {
let len = map.get_u32_le();
let (str, new) = map.split_at(len as usize);
map = new;
rewrites.push(RewriteType::Replace {
start: pos,
end: pos + size,
str,
});
} else {
panic!(
"{x} {ty} {:X?} {:#?}",
&map[0..10],
&rewrites.last_chunk::<3>()
)
}
}
let mut out = Vec::with_capacity(res.js.len());
let mut cursor: u32 = 0;
for rewrite in rewrites {
match rewrite {
RewriteType::Insert { pos, size } => {
out.extend_from_slice(&js[cursor as usize..pos as usize]);
cursor = pos + size;
}
RewriteType::Replace { start, end, str } => {
out.extend_from_slice(&js[cursor as usize..start as usize]);
out.extend_from_slice(&str);
cursor = end;
}
}
}
out.extend_from_slice(&js[cursor as usize..]);
out.to_vec()
}
}
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