Racket Language Server

Implementation of the Language Server Protocol for Racket.

Custom extensions

Colorize Notification (:arrow_left:)

Colorize notifications are sent from the server to the client to enable semantic syntax highlighting.

When a file changes it is the server's responsibility to re-compute syntax highlighting and push them to the client. Newly pushed tokens always replace previously pushed tokens. There is no merging that happens on the client side.

Notification:

• method: 'racket/colorize'
• params: RacketColorizeParams defined as follows:

interface RacketColorizeParams {
    /**
     * The URI for which colorization is reported.
     */
    uri: DocumentUri;

    /**
     * An array of diagnostic information items.
     */
    tokens: RacketToken[];
}

interface RacketToken {
    /**
     * The kind of token.
     */
     kind: RacketTokenKind;

     /**
      * The lexer mode used.
      */
     mode: RacketLexerMode;

     /**
      * Range of the token.
      */
     range: Range;
}

enum RacketLexerMode {
    Racket = "racket",
    Scribble = "scribble",
    Other = "other"
}

enum RacketTokenKind {
    // Generic token kinds
    Symbol = "symbol",
    Keyword = "keyword",
    Comment = "comment",
    String = "string",
    Constant = "constant",
    Parenthesis = "parenthesis",
    Error = "error",
    NoColor = "no-color",
    Other = "other",
    // Racket token kinds
    HashColonKeyword = "hash-colon-keyword",
    SexpComment = "sexp-comment",
    // Racket semantic token kinds
    Imported = "imported",
    LexicallyBound = "lexically-bound",
    Free = "free",
    Set!d = "set!d",
    // Scribble token kinds
    Text = "text"
}

Indent Request (:arrow_left:)

Indent requests are sent from the client to the server to compute the indentation for a line number.

Request:

• method: 'racket/indent'
• params: RacketIndentParams defined as follows:

interface RacketIndentParams {
    /**
     * The TextDocument for which indentation is requested.
     */
    textDocument: TextDocumentIdentifier;

    /**
     * The line to indent.
     */
    line: number;
}

Response:

• result: number
• error: code and message set in case an exception happens during the definition request.

References

• [0] https://microsoft.github.io/language-server-protocol/specification
• [1] https://docs.racket-lang.org/tools/lang-languages-customization.html
• [2] https://github.com/jeapostrophe/racket-langserver

License

Copyright 2018 David Craven and others

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.