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@ -11,7 +11,7 @@ use helix_core::{
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history::History,
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line_ending::auto_detect_line_ending,
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syntax::{self, LanguageConfiguration},
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ChangeSet, Diagnostic, LineEnding, Rope, Selection, State, Syntax, Transaction,
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ChangeSet, Diagnostic, LineEnding, Rope, RopeBuilder, Selection, State, Syntax, Transaction,
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DEFAULT_LINE_ENDING,
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};
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@ -19,6 +19,8 @@ use crate::{DocumentId, Theme, ViewId};
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use std::collections::HashMap;
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const BUF_SIZE: usize = 8192;
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub enum Mode {
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Normal,
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@ -39,6 +41,7 @@ pub struct Document {
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pub(crate) selections: HashMap<ViewId, Selection>,
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path: Option<PathBuf>,
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encoding: &'static encoding_rs::Encoding,
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/// Current editing mode.
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pub mode: Mode,
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@ -78,6 +81,7 @@ impl fmt::Debug for Document {
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.field("text", &self.text)
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.field("selections", &self.selections)
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.field("path", &self.path)
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.field("encoding", &self.encoding)
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.field("mode", &self.mode)
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.field("restore_cursor", &self.restore_cursor)
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.field("syntax", &self.syntax)
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@ -116,6 +120,173 @@ impl FromStr for Mode {
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}
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}
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// The documentation and implementation of this function should be up-to-date with
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// its sibling function, `to_writer()`.
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//
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/// Decodes a stream of bytes into UTF-8, returning a `Rope` and the
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/// encoding it was decoded as. The optional `encoding` parameter can
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/// be used to override encoding auto-detection.
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pub fn from_reader<R: std::io::Read + ?Sized>(
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reader: &mut R,
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encoding: Option<&'static encoding_rs::Encoding>,
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) -> Result<(Rope, &'static encoding_rs::Encoding), Error> {
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// These two buffers are 8192 bytes in size each and are used as
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// intermediaries during the decoding process. Text read into `buf`
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// from `reader` is decoded into `buf_out` as UTF-8. Once either
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// `buf_out` is full or the end of the reader was reached, the
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// contents are appended to `builder`.
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let mut buf = [0u8; BUF_SIZE];
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let mut buf_out = [0u8; BUF_SIZE];
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let mut builder = RopeBuilder::new();
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// By default, the encoding of the text is auto-detected via the
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// `chardetng` crate which requires sample data from the reader.
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// As a manual override to this auto-detection is possible, the
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// same data is read into `buf` to ensure symmetry in the upcoming
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// loop.
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let (encoding, mut decoder, mut slice, mut is_empty) = {
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let read = reader.read(&mut buf)?;
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let is_empty = read == 0;
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let encoding = encoding.unwrap_or_else(|| {
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let mut encoding_detector = chardetng::EncodingDetector::new();
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encoding_detector.feed(&buf, is_empty);
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encoding_detector.guess(None, true)
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});
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let decoder = encoding.new_decoder();
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// If the amount of bytes read from the reader is less than
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// `buf.len()`, it is undesirable to read the bytes afterwards.
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let slice = &buf[..read];
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(encoding, decoder, slice, is_empty)
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};
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// `RopeBuilder::append()` expects a `&str`, so this is the "real"
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// output buffer. When decoding, the number of bytes in the output
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// buffer will often exceed the number of bytes in the input buffer.
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// The `result` returned by `decode_to_str()` will state whether or
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// not that happened. The contents of `buf_str` is appended to
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// `builder` and it is reused for the next iteration of the decoding
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// loop.
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//
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// As it is possible to read less than the buffer's maximum from `read()`
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// even when the end of the reader has yet to be reached, the end of
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// the reader is determined only when a `read()` call returns `0`.
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//
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// SAFETY: `buf_out` is a zero-initialized array, thus it will always
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// contain valid UTF-8.
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let buf_str = unsafe { std::str::from_utf8_unchecked_mut(&mut buf_out[..]) };
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let mut total_written = 0usize;
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loop {
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let mut total_read = 0usize;
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loop {
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let (result, read, written, ..) = decoder.decode_to_str(
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&slice[total_read..],
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&mut buf_str[total_written..],
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is_empty,
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);
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// These variables act as the read and write cursors of `buf` and `buf_str` respectively.
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// They are necessary in case the output buffer fills before decoding of the entire input
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// loop is complete. Otherwise, the loop would endlessly iterate over the same `buf` and
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// the data inside the output buffer would be overwritten.
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total_read += read;
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total_written += written;
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match result {
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encoding_rs::CoderResult::InputEmpty => {
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debug_assert_eq!(slice.len(), total_read);
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break;
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}
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encoding_rs::CoderResult::OutputFull => {
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debug_assert!(slice.len() > total_read);
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builder.append(&buf_str[..total_written]);
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total_written = 0;
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}
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}
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}
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// Once the end of the stream is reached, the output buffer is
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// flushed and the loop terminates.
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if is_empty {
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debug_assert_eq!(reader.read(&mut buf)?, 0);
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builder.append(&buf_str[..total_written]);
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break;
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}
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// Once the previous input has been processed and decoded, the next set of
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// data is fetched from the reader. The end of the reader is determined to
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// be when exactly `0` bytes were read from the reader, as per the invariants
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// of the `Read` trait.
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let read = reader.read(&mut buf)?;
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slice = &buf[..read];
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is_empty = read == 0;
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}
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let rope = builder.finish();
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Ok((rope, encoding))
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}
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// The documentation and implementation of this function should be up-to-date with
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// its sibling function, `from_reader()`.
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//
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/// Encodes the text inside `rope` into the given `encoding` and writes the
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/// encoded output into `writer.` As a `Rope` can only contain valid UTF-8,
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/// replacement characters may appear in the encoded text.
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pub async fn to_writer<'a, W: tokio::io::AsyncWriteExt + Unpin + ?Sized>(
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writer: &'a mut W,
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encoding: &'static encoding_rs::Encoding,
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rope: &'a Rope,
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) -> Result<(), Error> {
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// Text inside a `Rope` is stored as non-contiguous blocks of data called
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// chunks. The absolute size of each chunk is unknown, thus it is impossible
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// to predict the end of the chunk iterator ahead of time. Instead, it is
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// determined by filtering the iterator to remove all empty chunks and then
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// appending an empty chunk to it. This is valuable for detecting when all
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// chunks in the `Rope` have been iterated over in the subsequent loop.
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let iter = rope
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.chunks()
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.filter(|c| !c.is_empty())
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.chain(std::iter::once(""));
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let mut buf = [0u8; BUF_SIZE];
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let mut encoder = encoding.new_encoder();
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let mut total_written = 0usize;
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for chunk in iter {
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let is_empty = chunk.is_empty();
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let mut total_read = 0usize;
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loop {
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let (result, read, written, ..) =
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encoder.encode_from_utf8(&chunk[total_read..], &mut buf[total_written..], is_empty);
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// These variables act as the read and write cursors of `chunk` and `buf` respectively.
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// They are necessary in case the output buffer fills before encoding of the entire input
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// loop is complete. Otherwise, the loop would endlessly iterate over the same `chunk` and
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// the data inside the output buffer would be overwritten.
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total_read += read;
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total_written += written;
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match result {
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encoding_rs::CoderResult::InputEmpty => {
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debug_assert_eq!(chunk.len(), total_read);
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debug_assert!(buf.len() >= total_written);
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break;
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}
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encoding_rs::CoderResult::OutputFull => {
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debug_assert!(chunk.len() > total_read);
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writer.write_all(&buf[..total_written]).await?;
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total_written = 0;
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}
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}
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}
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// Once the end of the iterator is reached, the output buffer is
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// flushed and the outer loop terminates.
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if is_empty {
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writer.write_all(&buf[..total_written]).await?;
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writer.flush().await?;
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break;
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}
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}
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Ok(())
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}
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/// Like std::mem::replace() except it allows the replacement value to be mapped from the
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/// original value.
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fn take_with<T, F>(mut_ref: &mut T, closure: F)
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@ -216,13 +387,15 @@ use helix_lsp::lsp;
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use url::Url;
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impl Document {
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pub fn new(text: Rope) -> Self {
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pub fn from(text: Rope, encoding: Option<&'static encoding_rs::Encoding>) -> Self {
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let encoding = encoding.unwrap_or(encoding_rs::UTF_8);
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let changes = ChangeSet::new(&text);
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let old_state = None;
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Self {
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id: DocumentId::default(),
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path: None,
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encoding,
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text,
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selections: HashMap::default(),
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indent_style: IndentStyle::Spaces(4),
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@ -242,29 +415,31 @@ impl Document {
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}
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// TODO: async fn?
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pub fn load(
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/// Create a new document from `path`. Encoding is auto-detected, but it can be manually
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/// overwritten with the `encoding` parameter.
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pub fn open(
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path: PathBuf,
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encoding: Option<&'static encoding_rs::Encoding>,
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theme: Option<&Theme>,
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config_loader: Option<&syntax::Loader>,
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) -> Result<Self, Error> {
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use std::{fs::File, io::BufReader};
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if !path.exists() {
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return Ok(Self::default());
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}
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let mut doc = if !path.exists() {
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Rope::from(DEFAULT_LINE_ENDING.as_str())
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} else {
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let file = File::open(&path).context(format!("unable to open {:?}", path))?;
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Rope::from_reader(BufReader::new(file))?
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};
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let mut file = std::fs::File::open(&path).context(format!("unable to open {:?}", path))?;
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let (mut rope, encoding) = from_reader(&mut file, encoding)?;
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// search for line endings
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let line_ending = auto_detect_line_ending(&doc).unwrap_or(DEFAULT_LINE_ENDING);
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let line_ending = auto_detect_line_ending(&rope).unwrap_or(DEFAULT_LINE_ENDING);
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// add missing newline at the end of file
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if doc.len_bytes() == 0 || !char_is_line_ending(doc.char(doc.len_chars() - 1)) {
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doc.insert(doc.len_chars(), line_ending.as_str());
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if rope.len_bytes() == 0 || !char_is_line_ending(rope.char(rope.len_chars() - 1)) {
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rope.insert(rope.len_chars(), line_ending.as_str());
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}
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let mut doc = Self::new(doc);
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let mut doc = Self::from(rope, Some(encoding));
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// set the path and try detecting the language
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doc.set_path(&path)?;
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doc.detect_indent_style();
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@ -303,6 +478,8 @@ impl Document {
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// TODO: do we need some way of ensuring two save operations on the same doc can't run at once?
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// or is that handled by the OS/async layer
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/// The `Document`'s text is encoded according to its encoding and written to the file located
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/// at its `path()`.
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pub fn save(&mut self) -> impl Future<Output = Result<(), anyhow::Error>> {
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// we clone and move text + path into the future so that we asynchronously save the current
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// state without blocking any further edits.
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@ -320,8 +497,11 @@ impl Document {
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self.last_saved_revision = history.current_revision();
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self.history.set(history);
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let encoding = self.encoding;
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// We encode the file according to the `Document`'s encoding.
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async move {
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use tokio::{fs::File, io::AsyncWriteExt};
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use tokio::fs::File;
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if let Some(parent) = path.parent() {
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// TODO: display a prompt asking the user if the directories should be created
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if !parent.exists() {
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@ -330,13 +510,9 @@ impl Document {
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));
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}
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}
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let mut file = File::create(path).await?;
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// write all the rope chunks to file
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for chunk in text.chunks() {
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file.write_all(chunk.as_bytes()).await?;
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}
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// TODO: flush?
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let mut file = File::create(path).await?;
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to_writer(&mut file, encoding, &text).await?;
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if let Some(language_server) = language_server {
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language_server
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@ -531,7 +707,7 @@ impl Document {
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self.selections.insert(view_id, selection);
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}
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fn _apply(&mut self, transaction: &Transaction, view_id: ViewId) -> bool {
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fn apply_impl(&mut self, transaction: &Transaction, view_id: ViewId) -> bool {
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let old_doc = self.text().clone();
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let success = transaction.changes().apply(&mut self.text);
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@ -594,7 +770,7 @@ impl Document {
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});
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}
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let success = self._apply(transaction, view_id);
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let success = self.apply_impl(transaction, view_id);
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if !transaction.changes().is_empty() {
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// Compose this transaction with the previous one
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@ -608,7 +784,7 @@ impl Document {
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pub fn undo(&mut self, view_id: ViewId) {
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let mut history = self.history.take();
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let success = if let Some(transaction) = history.undo() {
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self._apply(&transaction, view_id)
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self.apply_impl(transaction, view_id)
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} else {
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false
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};
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@ -623,7 +799,7 @@ impl Document {
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pub fn redo(&mut self, view_id: ViewId) {
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let mut history = self.history.take();
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let success = if let Some(transaction) = history.redo() {
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self._apply(&transaction, view_id)
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self.apply_impl(transaction, view_id)
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} else {
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false
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};
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@ -638,14 +814,14 @@ impl Document {
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pub fn earlier(&mut self, view_id: ViewId, uk: helix_core::history::UndoKind) {
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let txns = self.history.get_mut().earlier(uk);
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for txn in txns {
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self._apply(&txn, view_id);
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self.apply_impl(&txn, view_id);
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}
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}
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pub fn later(&mut self, view_id: ViewId, uk: helix_core::history::UndoKind) {
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let txns = self.history.get_mut().later(uk);
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for txn in txns {
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self._apply(&txn, view_id);
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self.apply_impl(&txn, view_id);
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}
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}
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@ -670,12 +846,10 @@ impl Document {
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self.history.set(history);
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}
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#[inline]
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pub fn id(&self) -> DocumentId {
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self.id
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}
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#[inline]
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pub fn is_modified(&self) -> bool {
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let history = self.history.take();
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let current_revision = history.current_revision();
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@ -683,12 +857,10 @@ impl Document {
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current_revision != self.last_saved_revision || !self.changes.is_empty()
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}
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#[inline]
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pub fn mode(&self) -> Mode {
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self.mode
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}
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#[inline]
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/// Corresponding language scope name. Usually `source.<lang>`.
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pub fn language(&self) -> Option<&str> {
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self.language
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@ -696,21 +868,21 @@ impl Document {
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.map(|language| language.scope.as_str())
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}
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#[inline]
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pub fn language_config(&self) -> Option<&LanguageConfiguration> {
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self.language.as_deref()
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}
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#[inline]
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/// Current document version, incremented at each change.
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pub fn version(&self) -> i32 {
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self.version
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}
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#[inline]
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pub fn language_server(&self) -> Option<&helix_lsp::Client> {
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self.language_server.as_deref()
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}
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#[inline]
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/// Tree-sitter AST tree
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pub fn syntax(&self) -> Option<&Syntax> {
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self.syntax.as_ref()
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@ -756,10 +928,12 @@ impl Document {
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self.path().map(|path| Url::from_file_path(path).unwrap())
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}
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#[inline]
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pub fn text(&self) -> &Rope {
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&self.text
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}
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#[inline]
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pub fn selection(&self, view_id: ViewId) -> &Selection {
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&self.selections[&view_id]
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}
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@ -787,6 +961,7 @@ impl Document {
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// -- LSP methods
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#[inline]
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pub fn identifier(&self) -> lsp::TextDocumentIdentifier {
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lsp::TextDocumentIdentifier::new(self.url().unwrap())
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}
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@ -795,6 +970,7 @@ impl Document {
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lsp::VersionedTextDocumentIdentifier::new(self.url().unwrap(), self.version)
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}
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#[inline]
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pub fn diagnostics(&self) -> &[Diagnostic] {
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&self.diagnostics
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}
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@ -804,6 +980,13 @@ impl Document {
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}
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}
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impl Default for Document {
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fn default() -> Self {
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let text = Rope::from(DEFAULT_LINE_ENDING.as_str());
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Self::from(text, None)
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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@ -812,7 +995,7 @@ mod test {
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fn changeset_to_changes() {
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use helix_lsp::{lsp, Client, OffsetEncoding};
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let text = Rope::from("hello");
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let mut doc = Document::new(text);
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let mut doc = Document::from(text, None);
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let view = ViewId::default();
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doc.set_selection(view, Selection::single(5, 5));
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@ -921,4 +1104,94 @@ mod test {
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]
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);
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}
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#[test]
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fn test_line_ending() {
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if cfg!(windows) {
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assert_eq!(Document::default().text().to_string(), "\r\n");
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} else {
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assert_eq!(Document::default().text().to_string(), "\n");
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}
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}
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macro_rules! test_decode {
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($label:expr, $label_override:expr) => {
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let encoding = encoding_rs::Encoding::for_label($label_override.as_bytes()).unwrap();
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let base_path = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests");
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let path = base_path.join(format!("{}_in.txt", $label));
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let ref_path = base_path.join(format!("{}_in_ref.txt", $label));
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assert!(path.exists());
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assert!(ref_path.exists());
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let mut file = std::fs::File::open(path).unwrap();
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let text = from_reader(&mut file, Some(encoding))
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.unwrap()
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.0
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.to_string();
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let expectation = std::fs::read_to_string(ref_path).unwrap();
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assert_eq!(text[..], expectation[..]);
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};
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}
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macro_rules! test_encode {
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($label:expr, $label_override:expr) => {
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let encoding = encoding_rs::Encoding::for_label($label_override.as_bytes()).unwrap();
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let base_path = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests");
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let path = base_path.join(format!("{}_out.txt", $label));
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let ref_path = base_path.join(format!("{}_out_ref.txt", $label));
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assert!(path.exists());
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assert!(ref_path.exists());
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let text = Rope::from_str(&std::fs::read_to_string(path).unwrap());
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let mut buf: Vec<u8> = Vec::new();
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helix_lsp::block_on(to_writer(&mut buf, encoding, &text)).unwrap();
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let expectation = std::fs::read(ref_path).unwrap();
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assert_eq!(buf, expectation);
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};
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}
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macro_rules! test_decode_fn {
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($name:ident, $label:expr, $label_override:expr) => {
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#[test]
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fn $name() {
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test_decode!($label, $label_override);
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}
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};
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($name:ident, $label:expr) => {
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#[test]
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fn $name() {
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test_decode!($label, $label);
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}
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};
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}
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macro_rules! test_encode_fn {
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($name:ident, $label:expr, $label_override:expr) => {
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#[test]
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fn $name() {
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test_encode!($label, $label_override);
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}
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};
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($name:ident, $label:expr) => {
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#[test]
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fn $name() {
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test_encode!($label, $label);
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}
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};
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}
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test_decode_fn!(test_big5_decode, "big5");
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test_encode_fn!(test_big5_encode, "big5");
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test_decode_fn!(test_euc_kr_decode, "euc_kr", "EUC-KR");
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test_encode_fn!(test_euc_kr_encode, "euc_kr", "EUC-KR");
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test_decode_fn!(test_gb18030_decode, "gb18030");
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test_encode_fn!(test_gb18030_encode, "gb18030");
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test_decode_fn!(test_iso_2022_jp_decode, "iso_2022_jp", "ISO-2022-JP");
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test_encode_fn!(test_iso_2022_jp_encode, "iso_2022_jp", "ISO-2022-JP");
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test_decode_fn!(test_jis0208_decode, "jis0208", "EUC-JP");
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test_encode_fn!(test_jis0208_encode, "jis0208", "EUC-JP");
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test_decode_fn!(test_jis0212_decode, "jis0212", "EUC-JP");
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test_decode_fn!(test_shift_jis_decode, "shift_jis");
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test_encode_fn!(test_shift_jis_encode, "shift_jis");
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}
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Shafkath Shuhan
4 years ago
committed by
Blaž Hrastnik