Bugfixes & MkDocs

• Several bugfixes
• Added MkDocs documentation (will replace github's wiki as official docs)

Relative imports, and bugfixes

• Added support for relative imports: %import .local_grammar.TERM will look for ./local_grammar.lark

• Added syntax for importing several terminals on one line: %import common (NUMBER LETTER FLOAT)

• Several bug-fixes

Minor fixes

• Fixed a bug in PropagatePositions, that could occur when the user supplied Lark with a reducing transformer

• Added support for v_args(tree=True), which supplies the decorated transformer method with the entire tree (instead of just the list of children)

Corrections and improvments, following the 0.6.0 release

• Lark grammars are now utf8 by default

• Added option to provide a custom lexer (with example)

• Fixed issue where Lark would throw RecursionError for huge grammars

• Improved error messages

Big improvements -- BREAKING CHANGES

Breaking changes:

• Changes to Tree: Added meta attribute, in addition to data and children. Line & column attributes, when using propagate_positions, moved to meta (i.e. tree.meta.line)

• Revised transformers and visitors. Added v_args. inline_args and InlineTransformer are now deprecated. Instead, use v_args(inline=True) as a decorator on transformer methods and class definition.

• Changed default Earley lexing behavior - now returns the maximum match only. The original behavior, that attempts to match all appearances of a terminal, has been moved to the "dynamic_complete" lexer. (commit 6ea4588)

• Restructured exceptions - UnexpectedInput is now superclass of UnexpectedToken and UnexpectedCharacters, all of which support the get_context() and match_examples() methods. (commit 5c6df8e)

• Columns now start at 1 (instead of 0)

• Default LALR lexer in now contextual

• Removed "scanless parsing" mode (wasn't useful)

Other changes:

• Added %declare directive for plugin support.

• Default extension for Lark grammars is now .lark (with syntax highlighting for popular editors)

• Improved error reporting

• Lots of bugfixes, better performance, and cleaner code.

Bugfixes

• Bugfix in Earley prioritization
• Bugfix: A tree builder optimization clashed with explicit ambiguity
• Bugfix in standalone parser
• Ensure Tokens can be pickled correctly

Also better error messages (there's still much to do in that regard)

Faster tree construction (significant for LALR)

• Fixed an inefficiency in the tree builder, significant for big inputs
• More bugfixes and optimizations

Minor features and bugfixes

• Fixed propagate positions feature.

• Added support for ranged-repeat (see commit for details)

• Reconstruct now working again (experimental module)

• A few bugfixes and refactors

Lark now has a CYK parser

Also contains several usability fixes

0.5.2 - Standalone tool

Added a tool to generate standalone parsers for LALR(1)