CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

unreleased

Fixed

• Remove outdated Doxygen configuration options (issue #34).

1.13.5 - 2025-03-17

Fixed

• Update the minimum required CMake version to 3.10.0 due to deprecation (issue #33).

1.13.4 - 2025-03-17

Fixed

• Update the minimum required CMake version to 3.5.0 due to deprecation (issue #32).

1.13.3 - 2023-03-11

Fixed

• Fix the DOWNLOAD_EXTRACT_TIMESTAMP CMake warning (see datatype99/issues/15).

1.13.2 - 2022-05-15

Fixed

• Fix C++ compilation for ML99_INTRODUCE_VAR_TO_STMT and ML99_INTRODUCE_NON_NULL_PTR_TO_STMT (issue #25).

1.13.1 - 2021-12-09

Fixed

• Specify C as the project language in CMakeLists.txt. Previously, CMake detected C++ and required a C++ compiler to compile the project.

1.13.0 - 2021-12-01

Added

• Add the root CMakeLists.txt to be able to use CMake with FetchContent or add_subdirectory (PR #20).
• list.h:
  • ML99_listFilterMap to filter a list with a maybe-returning function.

1.12.1 - 2021-11-23

Deprecated

• Deprecate ML99_catEval because there were no use cases over time.

1.12.0 - 2021-11-09

Added

• choice.h:
  • ML99_choiceData, ML99_CHOICE_DATA to extract a choice value data.
• gen.h:
  • Add ML99_fnPtr(Stmt) to generate a function pointer.
• New module stmt.h:
  • Take ML99_INTRODUCE_VAR_TO_STMT, ML99_INTRODUCE_NON_NULL_PTR_TO_STMT, ML99_CHAIN_EXPR_STMT, ML99_CHAIN_EXPR_STMT_AFTER, and ML99_SUPPRESS_UNUSED_BEFORE_STMT from gen.h.

Changed

• choice.h:
  • Define the representation of choice types as (tag, ...).
• tuple.h:
  • Emit a fatal error in ML99_untuple if an argument is not a tuple.
• gen.h:
  • Move all statement chaining macros to stmt.h (see above).
  • Move ML99_GEN_SYM and ML99_TRAILING_SEMICOLON to util.h.

Deprecated

• tuple.h:
  • ML99_untupleChecked because it is the same as ML99_untuple.
  • ML99_tupleEval, ML99_untupleEval because there were no use cases over time.
• logical.h:
  • Move all functions to bool.h.
• control.h:
  • Move ML99_OVERLOAD to variadics.h.
  • Move ML99_if, ML99_IF to bool.h.
  • Move ML99_repeat, ML99_times to gen.h.

1.11.0 - 2021-10-02

Added

• New module seq.h:
  • ML99_seqIsEmpty, ML99_SEQ_IS_EMPTY to check for the empty sequence.
  • ML99_seqGet, ML99_SEQ_GET to get an i-indexed element.
  • ML99_seqTail, ML99_SEQ_TAIL to get a tail.
  • ML99_seqForEach(I) to iterate through each element.
• logical.h:
  • ML99_boolMatch(WithArgs) to perform pattern matching on a boolean value.

Changed

• list.h, variadics.h:
  • Remove the requirement that ML99_listFromTuples and ML99_variadicsForEach(I) can accept at most 63 arguments.

1.10.0 - 2021-09-14

Added

• util.h:
  • ML99_COMMA that expands to a single comma.

Deprecated

• util.h:
  • ML99_(L|R)PAREN because they result in code that is difficult to reason about.

1.9.0 - 2021-08-27

Added

• metalang99.h:
  • ML99_VERSION_COMPATIBLE to check for a SemVer-compatible version.
  • ML99_VERSION_EQ to check for an exact version.

1.8.0 - 2021-08-26

Added

• ident.h:
  • ML99_charLit, ML99_CHAR_LIT to convert a Metalang99 character to a C character literal.

1.7.0 - 2021-08-13

Changed

• assert.h:
  • Generate _Static_assert from the assertion macros if compiling on C11.

1.6.0 - 2021-08-13

Added

• Tuple counterparts of variadics (tuple.h):
  • ML99_tupleCount, ML99_TUPLE_COUNT.
  • ML99_tupleIsSingle, ML99_TUPLE_IS_SINGLE.
  • ML99_tupleForEach(I).

Fixed

• util.h:
  • ML99_cat3 & ML99_cat4 to desugar to themselves instead of ML99_cat.
• variadics.h:
  • Make variadics.h work without including nat.h & util.h.

1.5.0 - 2021-08-11

Added

• ML99_assignInitializerList(Stmt) as ML99_assign(Stmt) counterparts for initializer lists.

1.4.1 - 2021-08-05

Fixed

• Invalid C11 standard detection for _Static_assert (issue #15).
• Invalid C11 standard detection for _Static_assert on MSVC (issue #16).

1.4.0 - 2021-08-02

Added

• ML99_ALLOW_POOR_DIAGNOSTICS: if your compiler does not support decent diagnostic messages, Metalang99 will emit an error that can be suppressed by defining this macro.

Fixed

• Emit _Static_assert for diagnostics where possible:
  • C11.
  • Clang if __has_extension(c_static_assert).
  • GCC if newer than 4.6.

1.3.0 - 2021-07-24

Added

• util.h:
  • ML99_todo(WithMsg) and ML99_unimplemented(WithMsg) to indicate unimplemented functionality.

Fixed

• Handle the (...) (...) ... form in ML99_isUntuple:
  • All the dependent public functions inherit this ability too: ML99_isTuple, ML99_untupleChecked, and ML99_listFromTuples.
  • Now the interpreter is able to emit a syntax error for v(123) v(456).

Changed

• Emit syntax errors and errors from ML99_fatal right to a console if compiling on GCC.

1.2.0 - 2021-06-06

Added

• list.h:
  • ML99_listFromTuples to transform comma-separated tuples into a list.
• util.h:
  • ML99_(L|R)PAREN that expand to an opening/closing parenthesis.
• tuple.h:
  • ML99_untupleChecked to emit a fatal error if a provided argument is not a tuple.
• New module ident.h:
  • Migrate ML99_detectIdent, ML99_identEq, ML99_DETECT_IDENT, ML99_IDENT_EQ, ML99_C_KEYWORD_DETECTOR, ML99_UNDERSCORE_DETECTOR from util.h.
  • ML99_(LOWER|UPPER)CASE_DETECTOR to detect lower/uppercase characters.
  • ML99_DIGIT_DETECTOR to detect digits.
  • ML99_char_eq, ML99_CHAR_EQ to compare two characters.
  • ML99_is(Lower|Upper)case, ML99_IS_(LOWER|UPPER)CASE to check whether a letter is lower/uppercased.
  • ML99_isDigit, ML99_IS_DIGIT to check whether a character is digit.
  • ML99_isChar, ML99_IS_CHAR to check whether an identifier is a character.
  • ML99_(LOWER|UPPER)CASE_CHARS that expands to all comma-separated lower/uppercase characters.
  • ML99_DIGITS that expands to all comma-separated digits.

Changed

• util.h:
  • Automatically include ident.h for backwards compatibility.

Fixed

• Make Metalang99 work on TCC (see datatype99/issues/10).

1.1.0 - 2021-04-24

Added

• gen.h:
  • Statement chaining macros:
    • ML99_CHAIN_EXPR_STMT to execute a statement before the next statement.
    • ML99_CHAIN_EXPR_STMT_AFTER to execute a statement afterwards.
    • ML99_INTRODUCE_NON_NULL_PTR_TO_STMT to introduce a non-null pointer to a statement.
  • Other:
    • ML99_GEN_SYM to generate unique identifiers.
    • ML99_TRAILING_SEMICOLON to force a trailing semicolon.
    • ML99_semicoloned that puts a semicolon after its argument.
    • ML99_assign to assign something to something.
    • ML99_assignStmt to generate an assignment statement.
    • ML99_invoke to invoke a macro/function.
    • ML99_invokeStmt to generate a macro/function invocation statement.
    • ML99_prefixedBlock to generate prefix { code }.
• util.h:
  • Dealing with identifiers:
    • ML99_detectIdent.
    • ML99_identEq, ML99_IDENT_EQ to compare two identifiers.
    • ML99_C_KEYWORD_DETECTOR to detect the C11 keywords.
    • ML99_UNDERSCORE_DETECTOR to detect the underscore character (_).
  • Other:
    • ML99_uncomma to evaluate terms with the space-separator.
    • ML99_reify to reify a macro/function to a Metalang99-compliant metafunction.
    • ML99_cat3, ML99_CAT3, ML99_CAT3_PRIMITIVE.
    • ML99_cat4, ML99_CAT4, ML99_CAT4_PRIMITIVE.
• assert.h:
  • ML99_assert, ML99_assertEq.
• variadics.h:
  • ML99_variadicsIsSingle, ML99_VARIADICS_IS_SINGLE.
• Built-in data type assertion macros:
  • tuple.h: ML99_assertIsTuple.
  • nat.h: ML99_assertIsNat.

Fixed

• assert.h:
  • Parenthesize expressions passed to ML99_ASSERT, ML99_ASSERT_EQ.

Changed

• gen.h:
  • ML99_INTRODUCE_VAR_TO_STMT can deal with several variables.

Deprecated

• gen.h:
  • ML99_SUPPRESS_UNUSED_BEFORE_STMT (use ML99_CHAIN_EXPR_STMT((void)expr) instead).

1.0.0 - 2021-03-27

Added

• ML99_QUOTE.

Removed

• ML99_consume, ML99_CONSUME.

Changed

• Move ML99_TERMS from util.h to lang.h.
• Return a list of tuples from ML99_listZip, accept a list of tuples in ML99_listUnzip, return a tuple of lists from ML99_listPartition.
• ML99_listEval => ML99_LIST_EVAL, ML99_listEvalCommaSep => ML99_LIST_EVAL_COMMA_SEP.
• Accept ignored variadics in ML99_nil, ML99_empty, ML99_true, ML99_false, ML99_nothing (and their plain versions).

Fixed

• Emit the correct metafunction name in case of an error in ML99_listGet.
• Remove a precondition that metafunctions passed to ML99_listFoldl, ML99_listFolr, ML99_listFoldl1, ML99_listMap, ML99_listMapI, ML99_listFor, ML99_listMapInitLast, and ML99_listForInitLast must evaluate to a single term.

0.5.0 - 2021-03-22

Added

• ML99_SUPPRESS_UNUSED_BEFORE_STMT.
• ML99_tupleGet, ML99_variadicsGet, ML99_TUPLE_GET, ML99_VARIADICS_GET.
• ML99_tupleAppend, ML99_tuplePrepend.
• ML99_indexedArgs.
• ML99_appl4.
• ML99_times.
• ML99_TRUE, ML99_FALSE.
• ML99_LEFT, ML99_RIGHT, ML99_IS_LEFT, ML99_IS_RIGHT.
• ML99_JUST, ML99_NOTHING, ML99_IS_JUST, ML99_IS_NOTHING.
• ML99_NAT_MAX, ML99_DIV_CHECKED.
• gen.h.

Removed

• M_choiceEmpty(Plain) (this allows a more optimal choice representation).
• M_semicolon (this macro turned out to be dangerous).
• M_tupleHead, M_variadicsHead.
• M_overload.
• M_when(Plain), M_whenLazy(Plain).
• M_putBefore, M_putAfter, M_putBetween.
• M_leftUnderscored, M_rightUnderscored.
• misc.h, eval.h.

Changed

• Do not guarantee the exact number of available reduction steps, instead keep it "reasonable" for the practical needs.
• Amalgamate lang.h with eval.h.
• Employ the SCREAMING_CASE naming convention for plain macros.
• All macros are prefixed with ML99_, unconditionally.
• Accept a number as a first argument and a function as the second in ML99_repeat.
• M_get => ML99_listGet.
• M_overloadPlain => ML99_OVERLOAD.
• M_eval => ML99_EVAL.
• M_callTrivial => ML99_callUneval.
• Move ML99_repeat from misc.h to control.h.
• Move ML99_indexed(Params, Fields, InitializerList, Args) from misc.h to gen.h.
• Move ML99_braced, ML99_typedef, ML99_struct, ML99_anonStruct, ML99_union, ML99_anonUnion, ML99_enum, ML99_anonEnum from util.h to gen.h.
• M_assertPlain => ML99_ASSERT_UNEVAL, M_assertEmptyPlain => ML99_ASSERT_EMPTY_UNEVAL.
• Rename "unsigned integers" to "natural numbers":
  • uint.h => nat.h.
  • M_uintMatch(WithArgs) => ML99_natMatch(WithArgs).
  • M_uintEq => ML99_natEq.
  • M_uintNeq => ML99_natNeq.

Fixed

• Emit a compile-time error if /Zc:preprocessor (MSVC) was not specified.
• Allow branches in ML99_IF expand to commas.

0.4.2 - 2021-02-28

Added

• METALANG99_MAJOR, METALANG99_MINOR, METALANG99_PATCH.
• M_union, M_anonUnion, M_enum, M_anonEnum.
• METALANG99_GCC_PRAGMA, METALANG99_CLANG_PRAGMA.

Fixed

• Suppress Clang's -Wshadow for a variable produced by M_INTRODUCE_VAR_TO_STMT.

0.4.1 - 2021-02-28

Added

• M_DETECT_IDENT
• M_choicePlain, M_choiceEmptyPlain, M_consPlain, M_nilPlain.
• M_listMapInPlace, M_listMapInPlaceI.

Changed

• Increase the maximum arity from 16 to 255.
• Specify the exact number of commas produced by M_indexedInitializerList.

Fixed

• Initialize variables produced by M_semicolon and M_assertPlain to suppress warnings.

0.4.0 - 2021-02-26

Added

• tuple.h: M_tuple(Plain), M_tupleEval, M_untuple(Plain), M_untupleEval, M_isTuple(Plain), M_isUntuple(Plain), M_tupleHead(Plain), M_tupleTail(Plain).

Changed

• Move the corresponding functions from util.h and variadics.h to tuple.h.

0.3.0 - 2021-02-26

Added

• M_when, M_whenPlain, M_whenLazy, M_whenLazyPlain.
• M_leftUnderscored, M_rightUnderscored.
• M_INTRODUCE_VAR_TO_STMT.
• M_terms.
• M_tupleHead, M_tupleHeadPlain, M_tupleTail, M_tupleTailPlain.
• M_indexedParams, M_indexedFields, M_indexedInitializerList.
• M_typedef, M_struct, M_anonStruct.
• M_choiceTag, M_choiceTagPlain, M_isNilPlain, M_isCons, M_isConsPlain.

Changed

• Make M_variadicsHead accept a single argument too.
• Now at most 63 variadic arguments are acceptable by M_list, M_variadicsCount, and M_variadicsCountPlain.
• Terms now need to be separated by commas, e.g. instead of v(1) M_call(F, v(2)) v(3), write v(1), M_call(F, v(2)), v(3) or M_terms(v(1), M_call(F, v(2)), v(3).
• The empty sequence is prohibited by M_eval, M_call and M_abort.
• Use American style endings (because it is prevalent):
  • M_(un)parenthesise(Eval) => M_(un)tuple(Eval).
  • M_isParenthesised => M_isTuple.
  • M_isUnparenthesised => M_isUntuple.
  • M_parenthesisedVariadics(Head|Tail) => M_tuple(Head|Tail).
• Shorten functions on unsigned integers:
  • M_uintInc(Plain) => M_inc(Plain).
  • M_uintDec(Plain) => M_dec(Plain).
  • M_uintAdd(3) => M_add(3).
  • M_uintSub(3) => M_sub(3).
  • M_uintMul(3) => M_mul(3).
  • M_uintDiv(3) => M_div(3).
  • M_uintDivChecked => M_divChecked.
  • M_uintLesser(Eq) => M_lesser(Eq).
  • M_uintGreater(Eq) => M_greater(Eq).
  • M_uintMod => M_mod.
  • M_uintMin => M_min.
  • M_uintMax => M_max.
• M_variadicsMap => M_variadicsForEach, M_variadicsMapI => M_variadicsForEachI.

Fixed

• aux.* => util.* for compatibility with Windows.

Removed

• M_variadicsMapCommaSep, M_variadicsMapICommaSep (better use lists).
• M_const2, M_const3.

0.2.0 - 2021-02-05

Changed

• The project name Epilepsy => Metalang99 (more neutral).

Fixed

• Reporting about syntactic mismatches.

0.1.0 - 2021-02-04

Added

• This excellent project.