Change in 3.2.7.1

• Fix bug with repeated numeral characters outside of r{n,m} repetitions. This was a regression introduced in 3.2.7.

Changes in 3.2.7

• Allow arbitrary repetitions in regexps. Previously, the r{n,m} and related forms were restricted to single digit numbers n and m.

• DFA minimization used to crash on tokens of the form c* which produce automata with only accepting states. Considering the empty set of non-accepting states as an equivalence class caused minimization to crash with exception.

• The small_base flag is removed. Extremely old GHCs will no longer build.

• A number of bug fixes and clearer diagnostics.

Changes in 3.2.6:

• Support for the GHC 9.2.

  The array access primops now use the fixed-sized numeric types corresponding to the width of the data accessed. Additionally, the primops to convert to and from fixed-sized numeric types have been given new names.

  9.2 isn't cut yet, so these changes are somewhat speculative. Unfortunately, GHC must used a released version of Alex (and Happy) at all times until further changes have been made, so we must make the release to actually implement these changes in GHC.

  If the final GHC 9.2 ends up being different, this release will be marked broken to make it less likely people use it by accident.

Changes in 3.2.5:

• Build fixes for GHC 8.8.x

Changes in 3.2.4:

• Remove dependency on QuickCheck
• Change the way that bootstrapping is done: see README.md for build instructions

Changes in 3.2.3:

• fix issue when using cpphs (#116)

Changes in 3.2.2:

• Manage line length in generated files [GH-84]
• Fix issue when identifier with multiple single quotes, e.g. foo'' was used
• Allow omitting spaces around = in macro definitions
• Include pre-generated Parser.hs and Scan.hs in the Hackage upload, to make bootstrapping easier.

Changes in 3.2.1:

• Fix build problem with GHC; add new test tokens_scan_user.x

Changes in 3.2.0:

• Allow the token type and productions to be overloaded, and add new directives: %token, %typeclass, %action. See "Type Signatures and Typeclasses" in the manual.
• Some small space leak fixes

Changes in 3.1.7:

• Add support for %encoding directive (allows to control --latin1 from inside Alex scripts)
• Make code forward-compatible with in-progress proposals
• Suppress more warnings

Changes in 3.1.6:

• sdist for 3.1.5 was mis-generated, causing it to ask for Happy when building.

Changes in 3.1.5:

• Generate less warning-laden code, and suppress other warnings.
• Bug fixes.

Changes in 3.1.4:

• Add Applicative/Functor instances for GHC 7.10

Changes in 3.1.3:

• Fix for clang (XCode 5)

Changes in 3.1.2:

• Add missing file to extra-source-files

Changes in 3.1.1:

• Bug fixes (#24, #30, #31, #32)

Changes in 3.1.0:

• necessary changes to work with GHC 7.8.1

Changes in 3.0 (since 2.3.5)

• Unicode support (contributed mostly by Jean-Philippe Bernardy, with help from Alan Zimmerman).

  • An Alex lexer now takes a UTF-8 encoded byte sequence as input (see Section 5.1, “Unicode and UTF-8”. If you are using the "basic" wrapper or one of the other wrappers that takes a Haskell String as input, the string is automatically encoded into UTF-8 by Alex. If your input is a ByteString, you are responsible for ensuring that the input is UTF-8 encoded. The old 8-bit behaviour is still available via the --latin1 option.

  • Alex source files are assumed to be in UTF-8, like Haskell source files. The lexer specification can use Unicode characters and ranges.

  • alexGetChar is renamed to alexGetByte in the generated code.

  • There is a new option, --latin1, that restores the old behaviour.

• Alex now does DFA minimization, which helps to reduce the size of the generated tables, especially for lexers that use Unicode.