Page Comparison

group
    :   "group" ID ( ':' ID  )?  ( "implements" ID (',' ID  )* )? ';'
        ( template | mapdef )+
    ;

template
    :   (   '@' ID '.' ID
        |   ID
        )
        '(' (args)? ')' "::="
        (   STRING      // "..."
        |   BIGSTRING   // <<...>>
        )
    |   ID "::=" ID     // alias one template to another
    ;

args:   arg ( ',' arg )*
    ;

arg :   ID '=' STRING               // x="..."
    |   ID '=' ANONYMOUS_TEMPLATE   // x={...}
    |   ID
    ;

mapdef
    :   ID "::=" map
    ;

map :   '['
            keyValuePair (',' keyValuePair)*
            ( ',' "default" ':' keyValue )?
        ']'
    ;

keyValuePair
    :   STRING ':' keyValue
    ;

keyValue
    :   BIGSTRING
    |   STRING
    |   "key"
    |
    ;