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implements 'case statement macros' in order to encourage the development of pattern matching mechanisms that are not terrible to look at

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Andreas Rumpf 2018-08-16 00:16:49 +02:00
commit 1061e26bc9
4 changed files with 172 additions and 79 deletions
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changelog.md
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@ -95,7 +95,7 @@
- Added the procs ``rationals.`div```, ``rationals.`mod```, ``rationals.floorDiv`` and ``rationals.floorMod`` for rationals.
- Added the proc ``math.prod`` for product of elements in openArray.
- Added the proc ``parseBinInt`` to parse a binary integer from a string, which returns the value.
- ``parseOct`` and ``parseBin`` in parseutils now also support the ``maxLen`` argument similar to ``parseHexInt``
- ``parseOct`` and ``parseBin`` in parseutils now also support the ``maxLen`` argument similar to ``parseHexInt``.
- Added the proc ``flush`` for memory mapped files.
- Added the ``MemMapFileStream``.
- Added ``macros.copyLineInfo`` to copy lineInfo from other node.
@ -138,7 +138,13 @@
- ``func`` is now an alias for ``proc {.noSideEffect.}``.
- In order to make ``for`` loops and iterators more flexible to use Nim now
supports so called "for-loop macros". See
the `manual <manual.html#macros-for-loop-macros>`_ for more details.
the [manual](manual.html#macros-for-loop-macros) for more details.
This feature enables a Python-like generic ``enumerate`` implementation.
- Case statements can now be rewritten via macros. See the [manual]() for more information.
This feature enables custom pattern matchers.
- the `typedesc` special type has been renamed to just `type`.
- `static` and `type` are now also modifiers similar to `ref` and `ptr`.
They denote the special types `static[T]` and `type[T]`.
@ -171,7 +177,7 @@
- Thread-local variables can now be declared inside procs. This implies all
the effects of the ``global`` pragma.
- Nim now supports ``except`` clause in the export statement.
- Nim now supports the ``except`` clause in the export statement.
- Range float types, example ``range[0.0 .. Inf]``. More details in language manual.
- The ``{.this.}`` pragma has been deprecated. It never worked within generics and
@ -219,6 +225,6 @@
- macros.bindSym now capable to accepts not only literal string or string constant expression.
bindSym enhancement make it also can accepts computed string or ident node inside macros /
compile time functions / static blocks. Only in templates / regular code it retains it's old behavior.
This new feature can be accessed via {.experimental: "dynamicBindSym".} pragma/switch
This new feature can be accessed via {.experimental: "dynamicBindSym".} pragma/switch.
### Bugfixes