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0.3.0 (unreleased)

New features:

  • New parser option racket_hash_percent_symbols, implemented in PR #90 by @andrew-pa.
  • New parser option leading_digit_symbols (PR #106). This should now allow parsing files produced by recent KiCad versions, thus closing #64.
  • Accept symbols starting with an alphabetical unicode codepoint, fixing #112.

Fixes:

  • The Cons type now has a custom Drop implementation which avoids recursion on the "cdr" field. This allows for dropping long lists without overflowing the stack (#104).

Changes:

  • The sexp! macro is now only included when specifying the non-default feature sexp-macro. This makes the crate a bit more lightweight for users who don't need that macro.
  • The sexp! macro now recognizes keywords without a leading octothorpe, as in Emacs Lisp and Common Lisp, allowing for a less-noisy spelling; e.g.: :foo instead of #:foo. Feature request (#99) and initial implementation (#96) by @samuel-jimenez.
  • The parser::Options::elisp constructor now enables the leading_digit_symbols option, as that's what's appropriate for Emacs Lisp.

Maintenance-related changes:

  • The MSRV is now 1.56 and specified in Cargo.toml and the Rust edition has been updated to "2021".

0.2.7

New features:

  • The sexp macro now accepts unquoted symbols made up of Rust punctuation characters, as long as they also comply with the R7RS syntax.

Fixes:

  • The parser now copes better with symbols which are delimited with a non-space character (issue #40).

Maintenance-related changes:

  • The dependency on proc-macro-hack is now gone; this required bumping the MSRV to 1.45 (issue #78).
  • The dependency on iota and the dev-dependencies on criterion, quickcheck and rand have been updated.

0.2.6

This is a maintenance and bugfix release:

  • Fix reading close square delimiter when interpreting square brackets as list delimiters. Issue reported and fixed by @raffalevy.

0.2.5

New features:

  • An additional API that allows obtaining source location information is now available, thanks to the request of @emoon, who opened the very first issue on lexpr. The central point of the new API is the new Datum type, which combines a Value with location information.
  • The iterators for cons cell chains now have a peek method.
  • Number literals with R7RS radix prefixes are now understood. This allows for parsing of binary, octal, hexidecimal, and explicitly-decimal literals, e.g., #b10101110. #o0777, #xDEADBEEF and #d42. A sign is allowed to follow the radix prefix, as per R7RS formal syntax.

Besides some CI churn, the quickcheck_macros dev-dependency has been updated, which eliminates old versions of syn and quote from the transitive development build dependencies.

0.2.4

This is dependency-update release:

  • The procedural sexp macro is now implemented on top of proc-macro2 1.0 and quote 1.0.
  • lexpr now uses newer versions of criterion, quickcheck and rand in its dev-dependencies.

In addition, some minor code cleanups have been done, including slight simplification of some doctest examples.

0.2.3

New features:

  • Line comments are now recognized (and ignored) by the parser.
  • The Parser type now implements Iterator. This should make reading multiple S-expressions from a single source considerably more ergonomic.

0.2.2

New features:

  • The Value type now implements FromStr using the default syntax.

Parser bugfixes:

  • "Peculiar identifiers", i.e. those starting with "+", "-" or ".", should now be handled properly.

  • Number literals that start with a "+" are no longer erroneously parsed as symbols.

  • The handling of dots inside lists should now be more robust, detecting invalid syntax that was accepted before.

0.2.1

Fix version number in README; no other changes.

0.2.0

Incompatible changes:

  • The Atom enum no longer exists. All its variants are now part of the Value enum itself.
  • List values are no longer represented as List and ImproperList variants, but are more faithfully modeled as chains of "cons" cells. See the Value::Cons variant and the new Cons data type. Conversion to vectors and iteration over cons cell chains is supported.
  • The String, Symbol and Keyword variants no longer contain a String, but a Box<str> to reduce the memory footprint of Value. As in-place modification of these variants is expected to be a seldom-required operation, the ergonomic impact is deemed acceptable.
  • The Error type, as it currently only relates to S-expression parsing, is now found in the lexpr::parse module.

New features:

  • Serde support is now available via the companion crate serde-lexpr, which is developed in parallel with lexpr, sharing the same git repository.
  • There is now the Value::Vector variant for representing Lisp vectors. Vectors can be constructed via the sexp! macro using Scheme syntax, e.g. sexp!(#(1 2 3)). Both Emacs Lisp and Scheme syntax is supported for reading and printing.
  • Characters are now supported with the Value::Char variant. Both Emacs Lisp and Scheme syntax is supported.
  • Byte vectors are now supported with the Value::Bytes variant. This is supported for Scheme R6RS and R7RS syntax. For Emacs Lisp, this data type maps to unibyte strings.
  • Escapes sequences in string literals now support the appropriate syntax for the selected Lisp dialect, instead of using JSON syntax.
  • There is now a Number::visit method, which can be used to dispatch on the internal type of the number.

0.1.3

Noteworthy changes:

  • Initial parsing and printing support.

0.1.2

Noteworthy changes:

  • New constructors Value::list(), Value::improper_list(), and Value::empty_list().
  • New predicates Value::is_symbol(), Value::is_list(), and Value::is_improper_list().
  • New accessor Value::as_symbol().
  • New conversions using the From/Into traits:
    • Value can now additionally be constructed from Atom and Cow<str>.
    • Atom can now additionally be constructed from Cow<str>.
  • A few initial, basic API tests added.

0.1.1

Noteworthy changes:

  • Fix in Atom::keyword()
  • More accesor functions for Value and Atom
  • Documentation expanded a bit
  • We now build on travis-ci

0.1.0

Initial release, features:

  • Value type and sexp macro and corresponding documentation.