Unicode-symbols: Difference between revisions

Revision as of 12:37, 23 March 2010

Overview

An overview of the packages that provide Unicode symbols.

Naming: A package X-unicode-symbols defines new symbols for functions and operators from the package X.

All symbols are documented with their actual definition and information regarding their Unicode code point. They should be completely interchangeable with their definitions.

Alternatives for existing operators have the same fixity. New operators will have a suitable fixity defined.

UnicodeSyntax

GHC offers the UnicodeSyntax language extension. If you decide to use Unicode in your Haskell source then this extension can greatly improve how it looks.

Input methods

These symbols are all very nice but how do you type them?

TODO

base-unicode-symbols

Extra symbols for the base package.

API docs: http://hackage.haskell.org/package/base-unicode-symbols

darcs get http://code.haskell.org/~roelvandijk/code/base-unicode-symbols

====New symbol ideas==== (please add your own)

Original	Symbol	Code point	Name
Control.Monad.>>	≫	U+226B	MUCH GREATER-THAN

containers-unicode-symbols

Extra symbols for the containers package.

API docs: http://hackage.haskell.org/package/containers-unicode-symbols

darcs get http://code.haskell.org/~roelvandijk/code/containers-unicode-symbols

Fixities

What should the fixities for the following symbols be?

Symbol	Code point	Name
∪	U+222A	UNION
∩	U+2229	INTERSECTION
⊆	U+2286	SUBSET OF OR EQUAL TO
⊇	U+2287	SUPERSET OF OR EQUAL TO
⊈	U+2288	NEITHER A SUBSET OF NOR EQUAL TO
⊉	U+2289	NEITHER A SUPERSET OF NOR EQUAL TO
⊂	U+2282	SUBSET OF
⊃	U+2283	SUPERSET OF
⊄	U+2284	NOT A SUBSET OF
⊅	U+2285	NOT A SUPERSET OF

Intuitively there is a correspondence with numerical operators. Compare the following operators:

∪	+
⊃	>
⊄	≮

Likewise you would like similar associativities and precedence levels:

x + y + z < w == ((x + y) + z) < w x ∪ y ∪ w ⊂ z == ((x ∪ y) ∪ z) ⊂ w

====New symbol ideas==== (please add your own)

@@ Line 10: / Line 10: @@
 Alternatives for existing operators have the same fixity. New operators will have a suitable fixity defined.
+==== UnicodeSyntax ====
+GHC offers the [http://www.haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html#unicode-syntax UnicodeSyntax] language extension. If you decide to use Unicode in your Haskell source then this extension can greatly improve how it looks.
+==== Input methods ====
+These symbols are all very nice but how do you type them?
+TODO
 == base-unicode-symbols ==
-darcs get [http://code.haskell.org/~roelvandijk/code/base-unicode-symbols http://code.haskell.org/~roelvandijk/code/base-unicode-symbols]
+Extra symbols for the [http://hackage.haskell.org/package/base base] package.
+API docs: http://hackage.haskell.org/package/base-unicode-symbols
+darcs get http://code.haskell.org/~roelvandijk/code/base-unicode-symbols
+====New symbol ideas==== (please add your own)
+{| class="wikitable" border="1"
+|-
+!  Original
+!  Symbol
+!  Code point
+!  Name
+|-
+|  [http://haskell.org/ghc/docs/latest/html/libraries/base-4.2.0.0/Control-Monad.html#v:%3E%3E Control.Monad.>>]
+|  &#x226B;
+|  U+226B
+|  MUCH GREATER-THAN
+|}
 == containers-unicode-symbols ==
-darcs get [http://code.haskell.org/~roelvandijk/code/containers-unicode-symbols http://code.haskell.org/~roelvandijk/code/containers-unicode-symbols]
+Extra symbols for the [http://hackage.haskell.org/package/containers containers] package.
+API docs: http://hackage.haskell.org/package/containers-unicode-symbols
+darcs get http://code.haskell.org/~roelvandijk/code/containers-unicode-symbols
+==== Fixities ====
+What should the fixities for the following symbols be?
+{| class="wikitable" border="1"
+|-
+!  Symbol
+!  Code point
+!  Name
+|-
+|  &#x222A;
+|  U+222A
+|  UNION
+|-
+|  &#x2229;
+|  U+2229
+|  INTERSECTION
+|-
+|  &#x2286;
+|  U+2286
+|  SUBSET OF OR EQUAL TO
+|-
+|  &#x2287;
+|  U+2287
+|  SUPERSET OF OR EQUAL TO
+|-
+|  &#x2288;
+|  U+2288
+|  NEITHER A SUBSET OF NOR EQUAL TO
+|-
+|  &#x2289;
+|  U+2289
+|  NEITHER A SUPERSET OF NOR EQUAL TO
+|-
+|  &#x2282;
+|  U+2282
+|  SUBSET OF
+|-
+|  &#x2283;
+|  U+2283
+|  SUPERSET OF
+|-
+|  &#x2284;
+|  U+2284
+|  NOT A SUBSET OF
+|-
+|  &#x2285;
+|  U+2285
+|  NOT A SUPERSET OF
+|}
+Intuitively there is a correspondence with numerical operators. Compare the following operators:
+{| class="wikitable" border="1"
+| &#x222A;
+| +
+|-
+| &#x2283;
+| >
+|-
+| &#x2284;
+| &#x226E;
+|}
+Likewise you would like similar associativities and precedence levels:
+<tt>
+  x + y + z < w == ((x + y) + z) < w
+  x &#x222A; y &#x222A; w &#x2282; z == ((x &#x222A; y) &#x222A; z) &#x2282; w
+</tt>
+====New symbol ideas==== (please add your own)