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use std;
use std::str;
use std::io;
use std::fmt;
use std::string;
use std::error;
use serde_json;
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
pub enum Error {
Io(io::Error),
Utf8(str::Utf8Error),
BadJson(usize, usize, String),
VlqLeftover,
VlqNoValues,
BadSegmentSize(u32),
BadSourceReference(u32),
BadNameReference(u32),
IndexedSourcemap,
RegularSourcemap,
InvalidDataUrl,
CannotFlatten(String),
}
impl Error {
pub fn source_location(&self) -> Option<(usize, usize)> {
match *self {
Error::BadJson(lineno, col, _) => Some((lineno, col)),
_ => None,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Error {
Error::Io(err)
}
}
impl From<string::FromUtf8Error> for Error {
fn from(err: string::FromUtf8Error) -> Error {
From::from(err.utf8_error())
}
}
impl From<str::Utf8Error> for Error {
fn from(err: str::Utf8Error) -> Error {
Error::Utf8(err)
}
}
impl From<serde_json::Error> for Error {
fn from(err: serde_json::Error) -> Error {
use serde_json::Error::*;
match err {
Io(err) => From::from(err),
Syntax(code, line, col) => {
Error::BadJson(line, col, format!("{:?}", code))
}
}
}
}
impl error::Error for Error {
fn description(&self) -> &str {
use Error::*;
match *self {
Io(ref err) => err.description(),
Utf8(ref err) => err.description(),
BadJson(_, _, _) => "bad json",
VlqLeftover => "vlq leftover",
VlqNoValues => "no vlq values",
BadSegmentSize(_) => "bad segment size",
BadSourceReference(_) => "bad source reference",
BadNameReference(_) => "bad name reference",
IndexedSourcemap => "unexpected indexed sourcemap",
RegularSourcemap => "unexpected sourcemap",
InvalidDataUrl => "invalid data URL",
CannotFlatten(_) => "cannot flatten the given indexed sourcemap",
}
}
fn cause(&self) -> Option<&error::Error> {
use Error::*;
match *self {
Io(ref err) => Some(&*err),
Utf8(ref err) => Some(&*err),
_ => None,
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use Error::*;
match *self {
Io(ref msg) => write!(f, "{}", msg),
Utf8(ref msg) => write!(f, "{}", msg),
BadJson(line, col, ref msg) => write!(f, "bad json in line {}, column {}: {}", line, col, msg),
VlqLeftover => write!(f, "leftover cur/shift in vlq decode"),
VlqNoValues => write!(f, "vlq decode did not produce any values"),
BadSegmentSize(size) => write!(f, "got {} segments, expected 4 or 5", size),
BadSourceReference(id) => write!(f, "bad reference to source #{}", id),
BadNameReference(id) => write!(f, "bad reference to name #{}", id),
IndexedSourcemap => write!(f, "encountered unexpected indexed sourcemap"),
RegularSourcemap => write!(f, "encountered unexpected sourcemap where index was expected"),
InvalidDataUrl => write!(f, "the provided data URL is invalid"),
CannotFlatten(ref msg) => write!(f, "cannot flatten the indexed sourcemap: {}", msg),
}
}
}