onMessageSend_semAn

OnMessageSend_semAn.cyan

package metaobjectTest


@doc{*
    Annotations of this metaobject should be attached to a prototype. 
    The attached DSL code is made in Myan, which supports interpreted Cyan
    within parameterless methods declared with 'func': 
    
        func afterResTypes_codeToAdd {    
            // interpreted Cyan code
        }
    
    According to the method name, the Cyan code is interpreted in phase
    afterResTypes or semAn. Methods of interfaces
        IAction_semAn
        IActionNewPrototypes_semAn
        IAction_afterResTypes
        IActionNewPrototypes_afterResTypes
        IParseWithCyanCompiler_parsing 
        ICommunicateInPrototype_afterResTypes_semAn_afterSemAn    
        IActionMessageSend_semAn
        
    can be implemented. To better understand this, see the documentation 
    for action_afterResTypes_semAn.
*}
object OnMessageSend_semAn

    func run {
        var Int r = self mult: 2 to: 5;
        assert r == 0;
    }
    
    /*
        message passings
             x mult: n, other
        are replaced by, simply, 0.
    */
    @onMessageSend_semAn{*
        func semAn_analyzeReplaceKeywordMessage {
            return [. "0", "cyan.lang", "Int" .]
            
        }
    *}
    func mult: Int n  to: Int other -> Int {
        return n*other
    }

end