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# Changes

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## 2017/XX/XX
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* Changed Menhir's license from QPL to GPLv2.
  MenhirLib remains under LGPLv2, with a linking exception.
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* Moved the repository to
  [gitlab.inria.fr](https://gitlab.inria.fr/fpottier/menhir/).

* Introduced a new command line switch, `--cmly`, which causes Menhir to
  create a `.cmly` file, containing a description of the grammar and
  automaton. (Suggested by Frédéric Bour.)

* Introduced a new library, MenhirSdk, which allows reading a `.cmly` file.
  The purpose of this library is to allow external tools to take advantage
  of the work performed by Menhir's front-end. (Suggested by Frédéric Bour.)

* Introduced new syntax for attributes in a `.mly` file. Attributes are
  ignored by Menhir's back-ends, but are written to `.cmly` files, thus
  can be exploited by external tools via MenhirSdk. (Suggested by Frédéric Bour.)

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* The definition of a `%public` nonterminal symbol can now be split into several
  parts within a single `.mly` file. (This used to be permitted only over
  multiple `.mly` files.) (Suggested by Frédéric Bour.)
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* Improved the syntax error message that is displayed when a `.mly` file
  is incorrect: the previous and next token are shown.
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* Incompatible change in the incremental API: the type `env` becomes `'a env`.

* Incompatible change in the incremental API: the function
  `has_default_reduction` is renamed `env_has_default_reduction`.
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* The type `stack` and the function `stack` in the incremental API are
  deprecated. The new functions `top` and `pop` can be used instead to
  inspect the parser's stack. The module `MenhirLib.General` is deprecated
  as well. Deprecated functionality will be removed in the future.

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* Fixed a bug where the module name `Basics` was shadowed (that is, if the user's
  project happened to contain a toplevel module by this name, then it could not
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  be referred to from a `.mly` file). (Reported by François Thiré.)
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## 2017/01/01
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* Add `$MENHIR_STDLIB` as a way of controlling where Menhir looks for the file
  `standard.mly`. This environment variable overrides the installation-time
  default setting, and is itself overridden by the `--stdlib` command line
  switch. (Requested by Jonathan Protzenko.)
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* `Makefile` fix: filter out `'\r'` in the output of `menhir --suggest-ocamlfind`,
  so that the `Makefile` works when Menhir is compiled as a Windows executable.
  (Suggested by Jonathan Protzenko.)
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## 2016/12/01
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* Updated the Coq back-end for compatibility with Coq 8.6.
  (Jacques-Henri Jourdan.)
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## 2016/11/15
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* Fix in `--only-preprocess-for-ocamlyacc` mode: avoid printing newline characters
  inside a `%type` declaration, as this is forbidden by `ocamlyacc`. (Reported by
  Kenji Maillard.)
* Fix in `--only-preprocess-for-ocamlyacc` mode: avoid variable capture caused by
  `ocamlyacc` internally translating `$i` to `_i`. (Reported by Kenji Maillard.)
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## 2016/09/01
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* New command line switch `--only-preprocess-for-ocamlyacc`, supposed to print the
  grammar in a form that `ocamlyacc` can accept. As of now, this feature is
  incomplete (in particular, support for Menhir's position keywords is missing),
  untested, and undocumented. It could be removed in the future.
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## 2016/08/26
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* Fixes in the output of `--only-preprocess`:
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  * The order of productions is now preserved.
      (It was not. This matters if there are reduce/reduce conflicts.)
  * `%parameter` directives are now printed. (They were not).
  * `%on_error_reduce` directives are now printed. (They were not.)
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## 2016/08/25
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* `Makefile` fix, undoing a change made on 2016/03/03, which caused installation
  to fail under (some versions of?) Windows where dynamic linking is not
  supported. (Reported by Andrew Appel.)
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## 2016/08/05
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* `%on_error_reduce` declarations now have implicit priority levels, so as to
  tell Menhir what to do when two such declarations are applicable.
  Also, the well-formedness checks on `%type` and `%on_error_reduce` declarations
  have been reinforced.
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## 2016/06/23
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* A small change in the generated code (both in the code and table back-ends) so
  as to avoid OCaml's warning 41. The warning would arise (when compiling a
  generated parser with OCaml 4.03) because Menhir's exception `Error` has the
  same name as the data constructor `Error` in OCaml's pervasive library.
  (Reported by Bernhard Schommer.)
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## 2016/05/18
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* Anonymous rules now work also when used inside a parameterized rule.
  (This did not work until now.) When an anonymous rule is hoisted out
  of a parameterized rule, it may itself become parameterized. Menhir
  parameterizes it only over the parameters that it actually needs.
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## 2016/05/04
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* In the Coq backend, split the largest definitions into smaller
  ones. This circumvents a limitation of vm_compute on 32 bit
  machines. This also enables us to perform sharing between
  definitions, so that the generated files are much smaller.
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## 2016/04/10
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* When printing a grammar (which is done by the `--only-preprocess` options),
  remove the leading bar `|`, for compatibility with `yacc` and `bison`.
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## 2016/03/11
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* In the code back-end, generate type annotations when extracting a semantic
  value out of the stack. When working with a semantic value of some function
  type, OCaml would incorrectly warn that this function does not use its
  argument. This warning should now be gone.
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## 2016/03/03
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* Makefile changes, so as to support `ocamlbuild` 4.03, which seems to have
  stricter hygiene rules than previous versions.
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## 2015/12/30
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* Prevented an incorrect installation that would take place if `USE_OCAMLFIND`
  was given during `make all` but not during `make install`. Added a command
  line directive `--suggest-ocamlfind`.
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## 2015/11/11
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* Fixed a severe bug in Menhir 20151110 which (when using the code back-end)
  could cause a generated parser to crash. Thanks to ygrek for reporting the
  bug.
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* The code produced by version `XXXXXXXX` of `menhir --table` can now be linked only
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  against a matching version of MenhirLib. If an incorrect version of MenhirLib
  is installed, the OCaml compiler should complain that
  `MenhirLib.StaticVersion.require_XXXXXXXX` is undefined.
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## 2015/11/10
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* Optimized the computation of `$symbolstartpos`, based on a couple of assumptions
  about the lexer. (See the manual.)
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## 2015/11/04
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* Modified the treatment of `%inline` so that the positions that are computed are
  the same, regardless of whether `%inline` is used. This property did not hold
  until now. It now does. Of course, this means that the positions computed by
  the new Menhir are not the same as those computed by older versions of Menhir.
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* Fixed a bug in the treatment of `%inline` that would lead to an incorrect
  position being computed when the caller and callee had a variable by the
  same name.
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* Modified Menhir so as to compute the start and end positions in the exact same
  way as `ocamlyacc`. (There used to be a difference in the treatment of epsilon
  productions.) Of course, this means that the positions computed by the new
  Menhir are not the same as those computed by older versions of Menhir. Added
  the keyword `$symbolstartpos` so as to simulate `Parsing.symbol_start_pos()`
  in the `ocamlyacc` world. The keyword `$startpos` sometimes produces a position
  that is too far off to the left; `$symbolstartpos` produces a more accurate
  position.
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* Incompatible change of the incremental API: instead of a unit argument, the
  entry points (which are named after the start symbols) now require an initial
  position, which typically should be `lexbuf.lex_curr_p`.
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* Fix-fix-and-re-fix the `Makefile` in an attempt to allow installation under
  opam/Windows. Thanks to Daniel Weil for patient explanations and testing.
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## 2015/10/29
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* MenhirLib is now installed in both binary and source forms.
  `menhir --suggest-menhirLib` reports where MenhirLib is installed.
  This can be used to retrieve a snapshot of MenhirLib in source form
  and include it in your project (if you wish to use `--table` mode, yet
  do not wish to have a dependency on MenhirLib).
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## 2015/10/26
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* Allow `--list-errors` to work on 32-bit machines (with low hard limits).
  This should fix a problem whereby the 2015/10/23 release could not
  bootstrap on a 32-bit machine.
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## 2015/10/23
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* New declaration `%on_error_reduce foo`, where `foo` is a nonterminal symbol.
  This modifies the automaton as follows. In every state where a production of
  the form `foo -> ...` is ready to be reduced, every error action is replaced
  with a reduction of this production. (If there is a conflict between several
  productions that could be reduced in this manner, nothing is done.) This does
  not affect the language that is accepted by the automaton, but delays the
  detection of an error: more reductions take place before the error is
  detected.
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* Fixed a bug whereby Menhir would warn about a useless `%prec` declaration,
  even though it was useful. This would happen when the declaration was
  duplicated (by inlining or by macro-expansion) and some but not all of
  the copies were useful.
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* Added `has_default_reduction` to the incremental API.
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* Modified the meaning of `--canonical` to allow default reductions to take
  place. This implies no loss of precision in terms of lookahead sets,
  and should allow gaining more contextual information when a syntax
  error is encountered. (It should also lead to a smaller automaton.)
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* A brand new set of tools to work on syntax errors.
* New command `--list-errors`, which produces a list of input sentences which
  are representative of all possible syntax errors. (Costly.)
* New command `--interpret-error`, which confirms that one particular input
  sentence ends in a syntax error, and prints the number of the state in
  which this error occurs.
* New command `--compile-errors`, which compiles a list of erroneous sentences
  (together with error messages) to OCaml code.
* New command `--compare-errors`, which compares two lists of erroneous sentences
  to check if they cover the same error states.
* New command `--update-errors`, which updates the auto-generated comments in
  a list of erroneous sentences.
* New command `--echo-errors`, which removes all comments and messages from
  a list of erroneous sentences, and echoes just the sentences.
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## 2015/10/16
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* Additions to the incremental API.
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  * A `supplier` is a function that produces tokens on demand.
  * `lexer_lexbuf_to_supplier` turns a lexer and a lexbuf into a supplier.
  * `loop` is a ready-made made main parsing loop.
  * `loop_handle` is a variant that lets the user do her own error handling.
  * `loop_handle_undo` is a variant that additionally allows undoing the last
    few "spurious" reductions.
  * `number` maps a state of the LR(1) automaton to its number.
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* Incompatible change of the incremental API: renamed the type `'a result`
  to `'a checkpoint`. This is a better name anyway, and should help avoid
  confusion with the type `'a result` introduced in OCaml 4.03.
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* Avoid using `$(shell pwd)` in `Makefile`, for better Windows compatibility.
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* Fixed a bug where inconsistent OCaml code was generated when `--table`
  and `--external-tokens` were used together. (Reported by Darin Morrison.)
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* In `--infer` mode, leave the `.ml` file around (instead of removing it) if
  `ocamlc` fails, so we have a chance to understand what's wrong.
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## 2015/09/21
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* Re-established some error messages concerning the mis-use of `$i` which
  had disappeared on 2015/06/29.
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## 2015/09/11
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* Fixed the mysterious message that would appear when a nonterminal symbol
  begins with an uppercase letter and `--infer` is turned on. Clarified the
  documentation to indicate that a (non-start) nonterminal symbol can begin
  with an uppercase letter, but this is not recommended.
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## 2015/08/27
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* New option `--inspection` (added last January, documented only now). This
  generates an inspection API which allows inspecting the automaton's stack,
  among other things. This API can in principle be used to write custom code
  for error reporting, error recovery, etc. It is not yet mature and may
  change in the future.
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## 2015/07/20
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* Added the command line options `--unused-token <symbol>` and `--unused-tokens`.
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* Changed the treatment of the positional keywords `$i`. They are now
  rewritten into variables of the form `_i` where `i` is an integer.
  Users are advised not to use variables of this form inside semantic
  actions.
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## 2015/02/11
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* Added support for anonymous rules. This allows writing, e.g.,
  `list(e = expression SEMI { e })`
  whereas previously one should have written
  `list(terminated(e, SEMI))`.
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## 2015/02/09
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* Moved all of the demos to `ocamlbuild` (instead of `make`).
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* Incompatible change of the incremental API.
  The incremental API now exposes shift events too.
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* Fixed a couple bugs in `Makefile` and `src/Makefile` which would cause
  compilation and installation to fail with `TARGET=byte`. (Reported
  by Jérémie Courrèges-Anglas and Daniel Dickman.)
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* Incompatible change of the incremental API.
  The entry point `main_incremental` is now named `Incremental.main`.
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* Incompatible change of the incremental API.
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  * The API now exposes reduction events.
  * The type `'a result` is now private.
  * The type `env` is no longer parameterized.
  * `handle` is renamed to `resume`.
  * `offer` and `resume` now expect a result, not an environment.
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## 2014/12/22
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* Documented the Coq back-end (designed and implemented by Jacques-Henri Jourdan).
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## 2014/12/15
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* New incremental API (in `--table` mode only), inspired by Frédéric Bour.
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## 2014/12/11
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* Menhir now reports an error if one of the start symbols produces
  either the empty language or the singleton language {epsilon}.

* Although some people out there actually define a start symbol that recognizes
  {epsilon} (and use it as a way of initializing or re-initializing some global
  state), this is considered bad style. Furthermore, by ruling out this case, we
  are able to simplify the table back-end a little bit.
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## 2014/12/12
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* A speed improvement in the code back-end.
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## 2014/12/08
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* Menhir now requires OCaml 4.02 (instead of 3.09).
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* Removed support for the `$previouserror` keyword.
* Removed support for `--error-recovery` mode.
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* In the Coq backend, use `'` instead of `_` as separator in identifiers.
  Also, correct a serious bug that was inadvertently introduced on
  2013/03/01 (r319).

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* Lexer fix so as to support an open variant type `[> ...]` within
  a `%type<...>` declaration.
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* Updated the `Makefile` so that `install` no longer depends on `all`.

* Updated the demos so that the lexer does not invoke `exit 0`
  when encoutering `eof`. (This should be more intuitive.)
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## 2013/09/11
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* Fixed a newline conversion problem that would prevent Menhir from
  building on Windows when using ocaml 4.01.
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* Switched to ocamlbuild. Many thanks to Daniel Weil for offering
  very useful guidance.
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* `menhir --depend` was broken since someone added new whitespace in the output
  of `ocamldep`. Fixed.
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* Fixed a compilation problem that would arise when a file produced
  by Menhir on a 64-bit platform was compiled by ocaml on a 32-bit
  platform.
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* Performance improvements in the computation of various information
  about the automaton (module `Invariant`). The improvements will be
  noticeable only for very large automata.
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* The option `--log-grammar 3` (and above) now causes the `FOLLOW` sets for
  terminal symbols to be computed and displayed.
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* Added the flag `--canonical`, which causes Menhir to produce a canonical LR(1)
  automaton in the style of Knuth. This means that no merging of states takes
  place during the construction of the automaton, and that no default reductions
  are allowed.
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* Fixed a bug whereby a `%nonassoc` declaration was not respected. This
  declaration requests that a shift/reduce conflict be reduced in favor of
  neither shifting nor reducing, that is, a syntax error must occur. However,
  due to an unforeseen interaction with the default reduction mechanism, this
  declaration was sometimes ignored and reduction would take place.
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* Changes in the (undocumented) Coq back-end so as to match the ESOP 2012
  paper.
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* The `Makefile` now tests whether Unix or Windows is used (the test is performed
  by evaluating `Sys.os_type` under `ocaml`) and changes a couple settings accordingly:
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  * the executable file name is either `menhir` or `menhir.exe`
  * the object file suffix is either `.o` or `.obj`
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* Added `--strict`, which causes many warnings about the grammar and about the
  automaton to be considered errors.
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* The `#` annotations that are inserted in the generated `.ml` file now retain their
  full path. (That is, we no longer use `Filename.basename`.) This implies that
  the `#` annotations depend on how Menhir is invoked
  -- e.g., `menhir foo/bar.mly` and `cd foo && menhir bar.mly` will produce different
  results. Nevertheless, this seems reasonable and useful (e.g., in conjunction
  with `ocamlbuild` and a hierarchy of files). Thanks to Daniel Weil.
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* With the `-lg 1` switch, Menhir now indicates whether the grammar is SLR(1).
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* Removed the lock in `ocamldep.wrapper`. It is the responsibility of the user
  to avoid interferences with other processes (or other instances of the script)
  that create and/or remove files.
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* The (internal) computation of the automaton's invariant was broken and has
  been fixed. Surprisingly, this does not seem to affect the generated code,
  (which was correct,) so no observable bug is fixed. Hopefully no bug is
  introduced!
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* The grammar description files (`.mly`) are now read in up front and stored in
  memory while they are parsed. This allows us to avoid the use of `pos_in` and
  `seek_in`, which do not work correctly when CRLF conversion is being performed.
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* Fixed a bug in the type inference module (for parameterized non-terminals)
  which would cause an infinite loop.
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* Fixed a bug that would cause an assertion failure in the generated parser
  in some situations where the input stream was incorrect and the grammar
  involved the error token. The fix might cause grammars that use the error
  token to behave differently (hopefully more accurately) as of now.
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* `Makefile` changes: build and install only the bytecode version of MenhirLib
  when `TARGET=byte` is set.
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* Fixed `ocamldep.wrapper` to avoid quoting the name of the `ocaml` command.
  This is hoped to fix a compilation problem under MinGW.
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* A `Makefile` fix to avoid a problem under Windows/Cygwin.
* Renamed the `ocaml-check-version` script so as to avoid a warning.
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* Ocaml summer project: added `--interpret`, `--table`, and `--suggest-*`.
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* Fixed a problem that would cause the code inliner to abort when a semantic
  value and a non-terminal symbol happened to have the same name.
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* Removed code sharing.
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* Removed an incorrect assertion that caused failures (`lr1.ml`, line 134).
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* Disabled code sharing by default, as it is currently broken. (See Yann's
  message; assertion failure at runtime.)
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* Added an optimization to share code among states that have identical
  outgoing transition tables.
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* Small `Makefile` change: create an executable file for `check-ocaml-version` in
  order to work around the absence of dynamic loading on some platforms.
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* Made a fundamental change in the construction of the LR(1) automaton
  in order to eliminate a bug that could lead to spurious conflicts --
  thanks to Ketti for submitting a bug report.
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* Added `--follow-construction` to help understand the construction of the
  LR(1) automaton (very verbose).
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* Code generation: more explicit qualifications with `Pervasives` so as
  to avoid capture when the user redefines some of the built-in operators,
  such as `(+)`.
* Added a new demo (`calc-param`) that shows how to use `%parameter`.
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* `Makefile` improvements (check for `PREFIX`; bootstrap in bytecode now
  also available). Slight changes to `OMakefile.shared`.
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* Portability fix in `Makefile` and `Makefile.shared` (avoided `which`).
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* Portability fix in `Makefile.shared` (replaced `&>` with `2>&1 >`).
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* Made a slight restriction to Pager's criterion so as to never introduce
  fake conflict tokens (see `Lr0.compatible`). This might help make conflict
  explanations more accurate in the future.
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* Fixed bug that would cause positions to become invalid after inlining.
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* Fixed `--depend` to be more lenient when analyzing `ocamldep`'s output.
* Added `--raw-depend` which transmits `ocamldep`'s output unchanged (for
  use in conjunction with `omake`).
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* Fixed bug that would cause `--only-preprocess` to print `%token` declarations
  also for pseudo-tokens.
* Fixed bug that caused some precedence declarations to be incorrectly
  reported as useless.
* Improved things so that useless pseudo-tokens now also cause warnings.
* Fixed bug that would cause `%type` directives for terminal symbols to
  be incorrectly accepted.
* Fixed bug that would occur when a semantic action containing `$i` keywords
  was inlined.
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* Fixed problem that caused some end-of-stream conflicts not to be reported.
* Fixed Pager's compatibility criterion to avoid creating end-of-stream conflicts.
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* Fixed problem that allowed generating incorrect but apparently well-typed
  Objective Caml code when a semantic action was ill-typed and `--infer` was
  omitted.
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601 602

* Improved conflict reports by factoring out maximal common derivation contexts.
603

604
## 2006/03/28
605 606

* Fixed bug that could arise when explaining a conflict in a non-LALR(1) grammar.
607

608
## 2006/03/27
609

610 611
* Changed count of reduce/reduce conflicts to allow a comparison
  with `ocamlyacc`'s diagnostics.
612
* When refusing to resolve a conflict, report all diagnostics before dying.
613

614
## 2006/03/18
615 616 617 618

* Added display of `FOLLOW` sets when using `--log-grammar 2`.
* Added `--graph` option.
* Fixed behavior of `--depend` option.
619

620
## 2006/01/06
621 622

* Removed reversed lists from the standard library.