add class_fields as separate syntax

lib/parser/basic_types.rb

@@ -42,8 +42,8 @@ module Parser
     rule(:name)   { (keyword|type).absent? >> (match['a-z_'] >> match['a-zA-Z0-9_'].repeat).as(:name)  >> space? }
     # fields have type
     rule(:field) { type >> name >> (assign >> value_expression.as(:value) ).maybe}
+    rule(:class_field) { keyword_field >> field }
     # and class/module names must start with capital
-    # (admittatly the rule matches constants too, but one step at a time)
     rule(:module_name) { keyword.absent? >> (match['A-Z'] >> match['a-zA-Z0-9_'].repeat).as(:module_name)  >> space? }
 
     rule(:escape)     { str('\\') >> any.as(:esc) }

lib/parser/expression.rb

@@ -5,7 +5,8 @@ module Parser
     rule(:value_expression) { call_site | field_access |basic_type }
 
     rule(:expression) { (simple_return | while_do | small_conditional | conditional |
-                          operator_expression | call_site | field | hash_constant | array_constant)  }
+                          operator_expression | call_site | class_field | field |
+                          hash_constant | array_constant)  }
 
     def delimited_expressions( delimit )
       ( (delimit.absent? >> expression).repeat(1)).as(:expressions) >> delimit

lib/parser/keywords.rb

@@ -8,6 +8,7 @@ module Parser
     rule(:keyword_else)   {  str('else').as(:else) >> space? }
     rule(:keyword_end)    {  str('end').as(:end) >> space? }
     rule(:keyword_false)  {  str('false').as(:false) }
+    rule(:keyword_field)  {  str('field').as(:field) >> space? }
     rule(:keyword_if)     {  str('if').as(:if)  }
     rule(:keyword_rescue) {  str('rescue').as(:rescue) >> space?}
     rule(:keyword_return) {  str('return').as(:return) >> space?}
@@ -22,6 +23,6 @@ module Parser
     # space in above rules, so just make sure to add any here too.
     rule(:keyword){ str('begin') | str('def') | str('do') | str('else') | str('end') |
                     str('false')| str('if')| str('rescue')| str('true')| str('nil') |
-                    str('unless')| str('until')| str('while')}
+                    str('unless')| str('until')| str('while') | str('field')}
   end
 end

lib/parser/transform.rb

@@ -14,9 +14,15 @@ module Parser
     rule(:nil => simple(:nil)) { s(:nil) }
     rule(:integer => simple(:value)) { s(:int ,value.to_i) }
     rule(:name   => simple(:name))  { s(:name , name.to_sym) }
+    # local variables
     rule(:type   => simple(:type), :name   => simple(:name))  { s(:field_def , type.to_sym , name.to_sym) }
     rule(:type   => simple(:type), :name   => simple(:name) , :value => simple(:value))  {
       s(:field_def , type.to_sym , name.to_sym , value ) }
+    # class field
+    rule(:field => simple(:field) , :type   => simple(:type), :name   => simple(:name))  {
+      s(:class_field , type.to_sym , name.to_sym) }
+    rule(:field => simple(:field) , :type   => simple(:type), :name   => simple(:name) , :value => simple(:value))  {
+      s(:class_field , type.to_sym , name.to_sym , value ) }
 
     rule(:module_name   => simple(:module_name))  { s(:module,module_name.to_s) }
 

test/cases/class_def/class_derived.tst

@@ -1,7 +1,7 @@
 class Foo < Object
-  int field = 3
+  field int fff = 3
   int func()
-    return self.field
+    return self.fff
   end
   ofthen(3 , var)
 end
@@ -10,7 +10,7 @@ s(:expressions,
   s(:class, :Foo,
     s(:derives, :Object),
     s(:expressions,
-      s(:field_def, :int, :field,
+      s(:class_field, :int, :fff,
         s(:int, 3)),
       s(:function, :int,
         s(:name, :func),
@@ -21,7 +21,7 @@ s(:expressions,
               s(:receiver,
                 s(:name, :self)),
               s(:field,
-                s(:name, :field)))))),
+                s(:name, :fff)))))),
       s(:call,
         s(:name, :ofthen),
         s(:arguments,

test/cases/module_def/module_assign_var.tst

@@ -1,10 +1,11 @@
 module Opers
-  abba = 5
+  field int abba = 5
+  field ref baab
 end
 -- -- --
 s(:expressions,
   s(:module, :Opers,
     s(:expressions,
-      s(:assign,
+      s(:class_field, :int, :abba,
-        s(:name, :abba),
+        s(:int, 5)),
-        s(:int, 5)))))
+      s(:class_field, :ref, :baab))))