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use std::str;
use std::io::{Read, BufRead, BufReader};
use errors::Result;
use types::DecodedMap;
use jsontypes::MinimalRawSourceMap;
use decoder::{StripHeaderReader, decode_data_url, strip_junk_header};
use serde_json;
#[derive(PartialEq, Debug)]
pub enum SourceMapRef {
Ref(String),
LegacyRef(String),
Missing
}
impl SourceMapRef {
pub fn get_url(&self) -> Option<&str> {
match *self {
SourceMapRef::Ref(ref u) => Some(u.as_str()),
SourceMapRef::LegacyRef(ref u) => Some(u.as_str()),
SourceMapRef::Missing => None,
}
}
pub fn get_embedded_sourcemap(&self) -> Result<Option<DecodedMap>> {
if let Some(url) = self.get_url() {
if url.starts_with("data:") {
return Ok(Some(try!(decode_data_url(url))));
}
}
Ok(None)
}
}
pub fn locate_sourcemap_reference<R: Read>(rdr: R) -> Result<SourceMapRef> {
for line in BufReader::new(rdr).lines() {
let line = try!(line);
if line.starts_with("//# sourceMappingURL=") ||
line.starts_with("//@ sourceMappingURL=") {
let url = try!(str::from_utf8(&line.as_bytes()[21..])).trim().to_owned();
if line.starts_with("//@") {
return Ok(SourceMapRef::LegacyRef(url));
} else {
return Ok(SourceMapRef::Ref(url));
}
}
}
Ok(SourceMapRef::Missing)
}
pub fn locate_sourcemap_reference_slice(slice: &[u8]) -> Result<SourceMapRef> {
locate_sourcemap_reference(slice)
}
fn is_sourcemap_common(rsm: MinimalRawSourceMap) -> bool {
(rsm.version.is_some() || rsm.file.is_some()) && (
(rsm.sources.is_some() ||
rsm.source_root.is_some() ||
rsm.sources_content.is_some() ||
rsm.names.is_some()) && rsm.mappings.is_some()
) || rsm.sections.is_some()
}
fn is_sourcemap_impl<R: Read>(rdr: R) -> Result<bool> {
let mut rdr = StripHeaderReader::new(rdr);
let mut rdr = BufReader::new(&mut rdr);
let rsm : MinimalRawSourceMap = try!(serde_json::from_reader(&mut rdr));
Ok(is_sourcemap_common(rsm))
}
fn is_sourcemap_slice_impl(slice: &[u8]) -> Result<bool> {
let content = try!(strip_junk_header(slice));
let rsm : MinimalRawSourceMap = try!(serde_json::from_slice(content));
Ok(is_sourcemap_common(rsm))
}
pub fn is_sourcemap<R: Read>(rdr: R) -> bool {
is_sourcemap_impl(rdr).unwrap_or(false)
}
pub fn is_sourcemap_slice(slice: &[u8]) -> bool {
is_sourcemap_slice_impl(slice).unwrap_or(false)
}