making all assignment-y operators use a colon -- now it's +: -: *: /:, and friends

Author: jashkenas

examples/poignant.cs

@@ -81,9 +81,9 @@
   hit: damage =>
     p_up: Math.rand( this.charisma )
     if p_up % 9 is 7
-      this.life += p_up / 4
+      this.life +: p_up / 4
       puts( "[" + this.name + " magick powers up " + p_up + "!]" ).
-    this.life -= damage
+    this.life -: damage
     if this.life <= 0 then puts( "[" + this.name + " has died.]" )..
 
   # This method takes one turn in a fight.

lib/coffee_script/CoffeeScript.tmbundle/Syntaxes/CoffeeScript.tmLanguage

@@ -241,7 +241,7 @@
 		</dict>
 		<dict>
 			<key>match</key>
-			<string>!|\$|%|&amp;|\*|\-\-|\-|\+\+|\+|~|===|==|=|!=|!==|&lt;=|&gt;=|&lt;&lt;=|&gt;&gt;=|&gt;&gt;&gt;=|&lt;&gt;|&lt;|&gt;|!|&amp;&amp;|\?|\|\||\:|\*=|(?&lt;!\()/=|%=|\+=|\-=|&amp;=|\^=|\b(in|instanceof|new|delete|typeof|and|or|is|isnt|not)\b</string>
+			<string>!|\$|%|&amp;|\*|\-\-|\-|\+\+|\+|~|===|==|=|!=|!==|&lt;=|&gt;=|&lt;&lt;=|&gt;&gt;=|&gt;&gt;&gt;=|&lt;&gt;|&lt;|&gt;|!|&amp;&amp;|\?|\|\||\:|\*:|(?&lt;!\()/=|%:|\+:|\-:|&amp;=|\^=|\b(in|instanceof|new|delete|typeof|and|or|is|isnt|not)\b</string>
 			<key>name</key>
 			<string>keyword.operator.cs</string>
 		</dict>

lib/coffee_script/grammar.y

@@ -26,7 +26,7 @@ prechigh
   left     '<=' '<' '>' '>='
   right    '==' '!=' IS ISNT
   left     '&&' '||' AND OR
-  right    '-=' '+=' '/=' '*='
+  right    '-:' '+:' '/:' '*:' '%:'
   right    DELETE INSTANCEOF TYPEOF
   left     "."
   right    THROW FOR IN WHILE NEW SUPER
@@ -179,10 +179,11 @@ rule
   | Expression AND Expression         { result = OpNode.new(val[1], val[0], val[2]) }
   | Expression OR Expression          { result = OpNode.new(val[1], val[0], val[2]) }
 
-  | Expression '-=' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
-  | Expression '+=' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
-  | Expression '/=' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
-  | Expression '*=' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
+  | Expression '-:' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
+  | Expression '+:' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
+  | Expression '/:' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
+  | Expression '*:' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
+  | Expression '%:' Expression        { result = OpNode.new(val[1], val[0], val[2]) }
   | Expression '||:' Expression       { result = OpNode.new(val[1], val[0], val[2]) }
   | Expression '&&:' Expression       { result = OpNode.new(val[1], val[0], val[2]) }
 

lib/coffee_script/nodes.rb

@@ -359,6 +359,11 @@ class OpNode < Node
       'is'    => '===',
       "isnt"  => "!==",
       'not'   => '!',
+      '+:'    => '+=',
+      '-:'    => '-=',
+      '*:'    => '*=',
+      '/:'    => '/=',
+      '%:'    => '%='
     }
     CONDITIONALS     = ['||:', '&&:']
     PREFIX_OPERATORS = ['typeof', 'delete']