mirror of https://github.com/chipsenkbeil/distant
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735 lines
22 KiB
Rust
735 lines
22 KiB
Rust
use derive_more::{Display, Error, From};
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use serde::{Deserialize, Serialize};
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use serde_json::{Map, Value};
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use std::{
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fmt,
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io::{self, BufRead},
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ops::{Deref, DerefMut},
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str::FromStr,
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string::FromUtf8Error,
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};
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/// Represents some data being communicated to/from an LSP consisting of a header and content part
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#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
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pub struct LspMsg {
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/// Header-portion of some data related to LSP
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header: LspHeader,
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/// Content-portion of some data related to LSP
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content: LspContent,
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}
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#[derive(Debug, Display, Error, From)]
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pub enum LspMsgParseError {
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/// When the received content is malformed
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BadContent(LspContentParseError),
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/// When the received header is malformed
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BadHeader(LspHeaderParseError),
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/// When a header line is not terminated in \r\n
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BadHeaderTermination,
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/// When input fails to be in UTF-8 format
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BadInput(FromUtf8Error),
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/// When some unexpected I/O error encountered
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IoError(io::Error),
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/// When EOF received before data fully acquired
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UnexpectedEof,
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}
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impl From<LspMsgParseError> for io::Error {
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fn from(x: LspMsgParseError) -> Self {
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match x {
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LspMsgParseError::BadContent(x) => x.into(),
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LspMsgParseError::BadHeader(x) => x.into(),
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LspMsgParseError::BadHeaderTermination => io::Error::new(
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io::ErrorKind::InvalidData,
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r"Received header line not terminated in \r\n",
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),
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LspMsgParseError::BadInput(x) => io::Error::new(io::ErrorKind::InvalidData, x),
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LspMsgParseError::IoError(x) => x,
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LspMsgParseError::UnexpectedEof => io::Error::from(io::ErrorKind::UnexpectedEof),
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}
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}
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}
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impl LspMsg {
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/// Returns a reference to the header part
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pub fn header(&self) -> &LspHeader {
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&self.header
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}
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/// Returns a mutable reference to the header part
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pub fn mut_header(&mut self) -> &mut LspHeader {
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&mut self.header
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}
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/// Returns a reference to the content part
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pub fn content(&self) -> &LspContent {
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&self.content
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}
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/// Returns a mutable reference to the content part
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pub fn mut_content(&mut self) -> &mut LspContent {
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&mut self.content
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}
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/// Updates the header content length based on the current content
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pub fn refresh_content_length(&mut self) {
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self.header.content_length = self.content.to_string().len();
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}
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/// Attempts to read incoming lsp data from a buffered reader.
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///
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/// Note that this is **blocking** while it waits on the header information (or EOF)!
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///
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/// ```text
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/// Content-Length: ...\r\n
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/// Content-Type: ...\r\n
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/// \r\n
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/// {
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/// "jsonrpc": "2.0",
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/// ...
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/// }
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/// ```
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pub fn from_buf_reader<R: BufRead>(r: &mut R) -> Result<Self, LspMsgParseError> {
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// Read in our headers first so we can figure out how much more to read
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let mut buf = String::new();
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loop {
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// Track starting position for new buffer content
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let start = buf.len();
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// Block on each line of input!
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let len = r.read_line(&mut buf)?;
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let end = start + len;
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// We shouldn't be getting end of the reader yet
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if len == 0 {
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return Err(LspMsgParseError::UnexpectedEof);
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}
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let line = &buf[start..end];
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// Check if we've gotten bad data
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if !line.ends_with("\r\n") {
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return Err(LspMsgParseError::BadHeaderTermination);
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// Check if we've received the header termination
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} else if line == "\r\n" {
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break;
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}
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}
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// Parse the header content so we know how much more to read
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let header = buf.parse::<LspHeader>()?;
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// Read remaining content
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let content = {
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let mut buf = vec![0u8; header.content_length];
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r.read_exact(&mut buf).map_err(|x| {
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if x.kind() == io::ErrorKind::UnexpectedEof {
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LspMsgParseError::UnexpectedEof
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} else {
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LspMsgParseError::IoError(x)
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}
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})?;
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String::from_utf8(buf)?.parse::<LspContent>()?
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};
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Ok(Self { header, content })
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}
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/// Converts into a vec of bytes representing the string format
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pub fn to_bytes(&self) -> Vec<u8> {
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self.to_string().into_bytes()
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}
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}
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impl fmt::Display for LspMsg {
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/// Outputs header & content in form
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///
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/// ```text
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/// Content-Length: ...\r\n
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/// Content-Type: ...\r\n
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/// \r\n
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/// {
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/// "jsonrpc": "2.0",
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/// ...
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/// }
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/// ```
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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self.header.fmt(f)?;
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self.content.fmt(f)
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}
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}
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impl FromStr for LspMsg {
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type Err = LspMsgParseError;
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/// Parses headers and content in the form of
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///
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/// ```text
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/// Content-Length: ...\r\n
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/// Content-Type: ...\r\n
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/// \r\n
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/// {
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/// "jsonrpc": "2.0",
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/// ...
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/// }
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/// ```
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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let mut r = io::BufReader::new(io::Cursor::new(s));
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Self::from_buf_reader(&mut r)
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}
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}
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/// Represents the header for LSP data
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#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
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pub struct LspHeader {
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/// Length of content part in bytes
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pub content_length: usize,
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/// Mime type of content part, defaulting to
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/// application/vscode-jsonrpc; charset=utf-8
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pub content_type: Option<String>,
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}
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impl fmt::Display for LspHeader {
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/// Outputs header in form
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///
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/// ```text
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/// Content-Length: ...\r\n
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/// Content-Type: ...\r\n
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/// \r\n
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/// ```
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "Content-Length: {}\r\n", self.content_length)?;
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if let Some(ty) = self.content_type.as_ref() {
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write!(f, "Content-Type: {}\r\n", ty)?;
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}
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write!(f, "\r\n")
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}
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}
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#[derive(Clone, Debug, PartialEq, Eq, Display, Error, From)]
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pub enum LspHeaderParseError {
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MissingContentLength,
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InvalidContentLength(std::num::ParseIntError),
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BadHeaderField,
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}
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impl From<LspHeaderParseError> for io::Error {
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fn from(x: LspHeaderParseError) -> Self {
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io::Error::new(io::ErrorKind::InvalidData, x)
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}
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}
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impl FromStr for LspHeader {
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type Err = LspHeaderParseError;
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/// Parses headers in the form of
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///
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/// ```text
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/// Content-Length: ...\r\n
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/// Content-Type: ...\r\n
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/// \r\n
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/// ```
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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let lines = s.split("\r\n").map(str::trim).filter(|l| !l.is_empty());
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let mut content_length = None;
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let mut content_type = None;
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for line in lines {
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match line.find(':') {
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Some(idx) if idx + 1 < line.len() => {
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let name = &line[..idx];
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let value = &line[(idx + 1)..];
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match name {
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"Content-Length" => content_length = Some(value.trim().parse()?),
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"Content-Type" => content_type = Some(value.trim().to_string()),
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_ => return Err(LspHeaderParseError::BadHeaderField),
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}
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}
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_ => {
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return Err(LspHeaderParseError::BadHeaderField);
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}
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}
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}
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match content_length {
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Some(content_length) => Ok(Self {
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content_length,
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content_type,
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}),
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None => Err(LspHeaderParseError::MissingContentLength),
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}
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}
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}
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/// Represents the content for LSP data
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#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
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pub struct LspContent(Map<String, Value>);
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fn for_each_mut_string<F1, F2>(value: &mut Value, check: &F1, mutate: &mut F2)
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where
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F1: Fn(&String) -> bool,
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F2: FnMut(&mut String),
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{
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match value {
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Value::Object(obj) => {
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// Mutate values
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obj.values_mut()
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.for_each(|v| for_each_mut_string(v, check, mutate));
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// Mutate keys if necessary
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let keys: Vec<String> = obj
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.keys()
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.filter(|k| check(k))
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.map(ToString::to_string)
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.collect();
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for key in keys {
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if let Some((mut key, value)) = obj.remove_entry(&key) {
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mutate(&mut key);
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obj.insert(key, value);
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}
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}
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}
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Value::Array(items) => items
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.iter_mut()
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.for_each(|v| for_each_mut_string(v, check, mutate)),
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Value::String(s) => mutate(s),
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_ => {}
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}
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}
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fn swap_prefix(obj: &mut Map<String, Value>, old: &str, new: &str) {
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let check = |s: &String| s.starts_with(old);
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let mut mutate = |s: &mut String| {
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if let Some(pos) = s.find(old) {
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s.replace_range(pos..pos + old.len(), new);
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}
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};
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// Mutate values
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obj.values_mut()
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.for_each(|v| for_each_mut_string(v, &check, &mut mutate));
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// Mutate keys if necessary
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let keys: Vec<String> = obj
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.keys()
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.filter(|k| check(k))
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.map(ToString::to_string)
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.collect();
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for key in keys {
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if let Some((mut key, value)) = obj.remove_entry(&key) {
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mutate(&mut key);
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obj.insert(key, value);
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}
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}
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}
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impl LspContent {
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/// Converts all URIs with `file://` as the scheme to `distant://` instead
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pub fn convert_local_scheme_to_distant(&mut self) {
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swap_prefix(&mut self.0, "file:", "distant:");
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}
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/// Converts all URIs with `distant://` as the scheme to `file://` instead
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pub fn convert_distant_scheme_to_local(&mut self) {
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swap_prefix(&mut self.0, "distant:", "file:");
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}
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}
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impl AsRef<Map<String, Value>> for LspContent {
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fn as_ref(&self) -> &Map<String, Value> {
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&self.0
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}
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}
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impl Deref for LspContent {
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type Target = Map<String, Value>;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl DerefMut for LspContent {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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impl fmt::Display for LspContent {
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/// Outputs content in JSON form
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(
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f,
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"{}",
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serde_json::to_string_pretty(self).map_err(|_| fmt::Error)?
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)
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}
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}
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#[derive(Debug, Display, Error, From)]
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pub struct LspContentParseError(serde_json::Error);
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impl From<LspContentParseError> for io::Error {
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fn from(x: LspContentParseError) -> Self {
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io::Error::new(io::ErrorKind::InvalidData, x)
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}
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}
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impl FromStr for LspContent {
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type Err = LspContentParseError;
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/// Parses content in JSON form
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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serde_json::from_str(s).map_err(From::from)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use test_log::test;
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macro_rules! make_obj {
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($($tail:tt)*) => {
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match serde_json::json!($($tail)*) {
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serde_json::Value::Object(x) => x,
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x => panic!("Got non-object: {:?}", x),
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}
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};
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}
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#[test]
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fn msg_display_should_output_header_and_content() {
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let msg = LspMsg {
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header: LspHeader {
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content_length: 123,
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content_type: Some(String::from("some content type")),
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},
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content: LspContent(make_obj!({"hello": "world"})),
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};
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let output = msg.to_string();
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assert_eq!(
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output,
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concat!(
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"Content-Length: 123\r\n",
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"Content-Type: some content type\r\n",
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"\r\n",
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"{\n",
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" \"hello\": \"world\"\n",
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"}",
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)
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);
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}
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#[test]
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fn msg_from_buf_reader_should_be_successful_if_valid_msg_received() {
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let mut input = io::Cursor::new(concat!(
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"Content-Length: 22\r\n",
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"Content-Type: some content type\r\n",
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"\r\n",
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"{\n",
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" \"hello\": \"world\"\n",
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"}",
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));
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let msg = LspMsg::from_buf_reader(&mut input).unwrap();
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assert_eq!(msg.header.content_length, 22);
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assert_eq!(
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msg.header.content_type.as_deref(),
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Some("some content type")
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);
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assert_eq!(msg.content.as_ref(), &make_obj!({ "hello": "world" }));
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}
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#[test]
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fn msg_from_buf_reader_should_fail_if_reach_eof_before_received_full_msg() {
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// No line termination
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let err = LspMsg::from_buf_reader(&mut io::Cursor::new("Content-Length: 22")).unwrap_err();
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assert!(
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matches!(err, LspMsgParseError::BadHeaderTermination),
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"{:?}",
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err
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);
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// Header doesn't finish
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let err = LspMsg::from_buf_reader(&mut io::Cursor::new(concat!(
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"Content-Length: 22\r\n",
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"Content-Type: some content type\r\n",
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)))
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.unwrap_err();
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assert!(matches!(err, LspMsgParseError::UnexpectedEof), "{:?}", err);
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// No content after header
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let err = LspMsg::from_buf_reader(&mut io::Cursor::new(concat!(
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"Content-Length: 22\r\n",
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"\r\n",
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)))
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.unwrap_err();
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assert!(matches!(err, LspMsgParseError::UnexpectedEof), "{:?}", err);
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}
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#[test]
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fn msg_from_buf_reader_should_fail_if_missing_proper_line_termination_for_header_field() {
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let err = LspMsg::from_buf_reader(&mut io::Cursor::new(concat!(
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"Content-Length: 22\n",
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"\r\n",
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"{\n",
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" \"hello\": \"world\"\n",
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"}",
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)))
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.unwrap_err();
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assert!(
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matches!(err, LspMsgParseError::BadHeaderTermination),
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"{:?}",
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err
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);
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}
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|
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#[test]
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fn msg_from_buf_reader_should_fail_if_bad_header_provided() {
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// Invalid content length
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let err = LspMsg::from_buf_reader(&mut io::Cursor::new(concat!(
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"Content-Length: -1\r\n",
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"\r\n",
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"{\n",
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" \"hello\": \"world\"\n",
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"}",
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)))
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.unwrap_err();
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assert!(matches!(err, LspMsgParseError::BadHeader(_)), "{:?}", err);
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// Missing content length
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let err = LspMsg::from_buf_reader(&mut io::Cursor::new(concat!(
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"Content-Type: some content type\r\n",
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"\r\n",
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"{\n",
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" \"hello\": \"world\"\n",
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"}",
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)))
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.unwrap_err();
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assert!(matches!(err, LspMsgParseError::BadHeader(_)), "{:?}", err);
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}
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#[test]
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fn msg_from_buf_reader_should_fail_if_bad_content_provided() {
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// Not full content
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let err = LspMsg::from_buf_reader(&mut io::Cursor::new(concat!(
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"Content-Length: 21\r\n",
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"\r\n",
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"{\n",
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" \"hello\": \"world\"\n",
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)))
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.unwrap_err();
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assert!(matches!(err, LspMsgParseError::BadContent(_)), "{:?}", err);
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}
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#[test]
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fn msg_from_buf_reader_should_fail_if_non_utf8_msg_encountered_for_content() {
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// Not utf-8 content
|
|
let mut raw = b"Content-Length: 2\r\n\r\n".to_vec();
|
|
raw.extend(vec![0, 159]);
|
|
|
|
let err = LspMsg::from_buf_reader(&mut io::Cursor::new(raw)).unwrap_err();
|
|
assert!(matches!(err, LspMsgParseError::BadInput(_)), "{:?}", err);
|
|
}
|
|
|
|
#[test]
|
|
fn header_parse_should_fail_if_missing_content_length() {
|
|
let err = "Content-Type: some type\r\n\r\n"
|
|
.parse::<LspHeader>()
|
|
.unwrap_err();
|
|
assert!(
|
|
matches!(err, LspHeaderParseError::MissingContentLength),
|
|
"{:?}",
|
|
err
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn header_parse_should_fail_if_content_length_invalid() {
|
|
let err = "Content-Length: -1\r\n\r\n"
|
|
.parse::<LspHeader>()
|
|
.unwrap_err();
|
|
assert!(
|
|
matches!(err, LspHeaderParseError::InvalidContentLength(_)),
|
|
"{:?}",
|
|
err
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn header_parse_should_fail_if_receive_an_unexpected_header_field() {
|
|
let err = "Content-Length: 123\r\nUnknown-Field: abc\r\n\r\n"
|
|
.parse::<LspHeader>()
|
|
.unwrap_err();
|
|
assert!(
|
|
matches!(err, LspHeaderParseError::BadHeaderField),
|
|
"{:?}",
|
|
err
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn header_parse_should_succeed_if_given_valid_content_length() {
|
|
let header = "Content-Length: 123\r\n\r\n".parse::<LspHeader>().unwrap();
|
|
assert_eq!(header.content_length, 123);
|
|
assert_eq!(header.content_type, None);
|
|
}
|
|
|
|
#[test]
|
|
fn header_parse_should_support_optional_content_type() {
|
|
// Regular type
|
|
let header = "Content-Length: 123\r\nContent-Type: some content type\r\n\r\n"
|
|
.parse::<LspHeader>()
|
|
.unwrap();
|
|
assert_eq!(header.content_length, 123);
|
|
assert_eq!(header.content_type.as_deref(), Some("some content type"));
|
|
|
|
// Type with colons
|
|
let header = "Content-Length: 123\r\nContent-Type: some:content:type\r\n\r\n"
|
|
.parse::<LspHeader>()
|
|
.unwrap();
|
|
assert_eq!(header.content_length, 123);
|
|
assert_eq!(header.content_type.as_deref(), Some("some:content:type"));
|
|
}
|
|
|
|
#[test]
|
|
fn header_display_should_output_header_fields_with_appropriate_line_terminations() {
|
|
// Without content type
|
|
let header = LspHeader {
|
|
content_length: 123,
|
|
content_type: None,
|
|
};
|
|
assert_eq!(header.to_string(), "Content-Length: 123\r\n\r\n");
|
|
|
|
// With content type
|
|
let header = LspHeader {
|
|
content_length: 123,
|
|
content_type: Some(String::from("some type")),
|
|
};
|
|
assert_eq!(
|
|
header.to_string(),
|
|
"Content-Length: 123\r\nContent-Type: some type\r\n\r\n"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn content_parse_should_succeed_if_valid_json() {
|
|
let content = "{\"hello\": \"world\"}".parse::<LspContent>().unwrap();
|
|
assert_eq!(content.as_ref(), &make_obj!({"hello": "world"}));
|
|
}
|
|
|
|
#[test]
|
|
fn content_parse_should_fail_if_invalid_json() {
|
|
assert!(
|
|
"not json".parse::<LspContent>().is_err(),
|
|
"Unexpectedly succeeded"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn content_display_should_output_content_as_json() {
|
|
let content = LspContent(make_obj!({"hello": "world"}));
|
|
assert_eq!(content.to_string(), "{\n \"hello\": \"world\"\n}");
|
|
}
|
|
|
|
#[test]
|
|
fn content_convert_local_scheme_to_distant_should_convert_keys_and_values() {
|
|
let mut content = LspContent(make_obj!({
|
|
"distant://key1": "file://value1",
|
|
"file://key2": "distant://value2",
|
|
"key3": ["file://value3", "distant://value4"],
|
|
"key4": {
|
|
"distant://key5": "file://value5",
|
|
"file://key6": "distant://value6",
|
|
"key7": [
|
|
{
|
|
"distant://key8": "file://value8",
|
|
"file://key9": "distant://value9",
|
|
}
|
|
]
|
|
},
|
|
"key10": null,
|
|
"key11": 123,
|
|
"key12": true,
|
|
}));
|
|
|
|
content.convert_local_scheme_to_distant();
|
|
assert_eq!(
|
|
content.0,
|
|
make_obj!({
|
|
"distant://key1": "distant://value1",
|
|
"distant://key2": "distant://value2",
|
|
"key3": ["distant://value3", "distant://value4"],
|
|
"key4": {
|
|
"distant://key5": "distant://value5",
|
|
"distant://key6": "distant://value6",
|
|
"key7": [
|
|
{
|
|
"distant://key8": "distant://value8",
|
|
"distant://key9": "distant://value9",
|
|
}
|
|
]
|
|
},
|
|
"key10": null,
|
|
"key11": 123,
|
|
"key12": true,
|
|
})
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn content_convert_distant_scheme_to_local_should_convert_keys_and_values() {
|
|
let mut content = LspContent(make_obj!({
|
|
"distant://key1": "file://value1",
|
|
"file://key2": "distant://value2",
|
|
"key3": ["file://value3", "distant://value4"],
|
|
"key4": {
|
|
"distant://key5": "file://value5",
|
|
"file://key6": "distant://value6",
|
|
"key7": [
|
|
{
|
|
"distant://key8": "file://value8",
|
|
"file://key9": "distant://value9",
|
|
}
|
|
]
|
|
},
|
|
"key10": null,
|
|
"key11": 123,
|
|
"key12": true,
|
|
}));
|
|
|
|
content.convert_distant_scheme_to_local();
|
|
assert_eq!(
|
|
content.0,
|
|
make_obj!({
|
|
"file://key1": "file://value1",
|
|
"file://key2": "file://value2",
|
|
"key3": ["file://value3", "file://value4"],
|
|
"key4": {
|
|
"file://key5": "file://value5",
|
|
"file://key6": "file://value6",
|
|
"key7": [
|
|
{
|
|
"file://key8": "file://value8",
|
|
"file://key9": "file://value9",
|
|
}
|
|
]
|
|
},
|
|
"key10": null,
|
|
"key11": 123,
|
|
"key12": true,
|
|
})
|
|
);
|
|
}
|
|
}
|