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> Do you really want your domain experts to fiddle with the core of your application or do you want your programmers to do that? The Curse Of Almost: Your tool is great, it's almost perfect... except for that one little thing it can't do, which your users need to do, which, therefore, leads to masses of ugly hacks unless you provide access to an escape hatch where sufficiently motivated experts can drop down to a real language which doesn't have your DSL's limitations and get the job done. It's the Curse Of Almost because, if it were too much worse of a fit for the problem, nobody would even think of using it to solve that problem. Getting someone 90% there and crapping out puts your users in a more awkward position, especially if they feel they've invested effort in whatever tool they have. An example is Talend versus CSV: Talend is an ETL Solution which Extracts data from some source, Transforms it according to a graphical DAG of ideally stateless components, and Loads it into some other storage. It's also a happy, friendly GUI on top of Java, which is nice, because the Real World isn't kind to happy, friendly GUI solutions which expect CSV is going to conform to any of your syntax rules or other misguided preconceptions about files having structure. So, when you have to run a Talend pipeline on vaguely-comma-delimited text files which may once have been machine-readable, you can make your own component which is literally just a block of Java code to parse the file using the Zerg Rush Of Ad-Hoc Rules Technique, an oft-overlooked method for designing parsers. You can also use that kind of thing to make components which are tasteless enough to demand state variables other than the stereotyped kind Talend itself provides. |