On Mon, Aug 29, 2011 at 3:52 PM, Willem Jiang <willem.ji...@gmail.com> wrote: > It could be handy if we leverage the other lib in the other camel-module. If > the user need the module, it will not be a burden for him to include a third > part lib. >
There is already other scripting languages you can use if you want a more powerful language. For example camel-groovy, or use camel-script so you can use JavaScript etc. All these languages have support by IDEs > On 8/29/11 8:19 PM, Claus Ibsen wrote: >> >> On Mon, Aug 29, 2011 at 11:14 AM, Christian Schneider >> <ch...@die-schneider.net> wrote: >>> >>> Hi Claus, >>> >>> the parser looks quite good as far as I looked into it. In any case much >>> better than regex. Before we replace the old parser we should also think >>> about tooling though. Some longer time ago I thought about using Xtext >>> for >>> the camel DSL and also the languages. The advantage would be that it is >>> quite easy to build real good Editor for the IDE. I guess with the >>> aproach >>> you followed this is not so easy. Of ocurse the initial effort of Xtext >>> would be a lot higher but perhaps it can pay off in the long run. >>> >>> Christian >>> >> >> I wanted something that was simple ;). Well in the sense that it does >> not add any extra JARs to the runtime. >> So if the tooling can generate plain java source code, then that would be >> nice. >> Also the tooling should be active maintained, so we dont end up using >> a dead end project in camel-core. >> >> Another goal is that anyone would be able to understand plain java >> code, and with a little reading of the code, >> be able to contribute and, eg. add a new function, or operator etc. >> >> I understand that XText is part of Eclipse, and it seems that it uses >> ANTLR under the covers. >> I would like to not go down a road to add any runtime deps to camel-core. >> >> At camel-extra there is a very old xtext project >> http://code.google.com/a/apache-extras.org/p/camel-extra/wiki/CamelSpit >> >> That said, we could possible add some grammar file to camel-core, >> which describes the grammer. >> Then any 3rd party tooling can use the grammar file to generate a >> parser for its tooling. >> >> >> >>> >>> >>> Am 29.08.2011 10:18, schrieb Claus Ibsen: >>>> >>>> Hi >>>> >>>> The current Simple language in camel-core has reached its potential in >>>> terms of maintenance and how easy it would be, for example to add new >>>> functions and operators. Likewise the current error reporting is not >>>> precise to point out where in the expression String the problem is. >>>> >>>> The implementation is using regular expressions, and that is one of >>>> the key problems. I think we have grown to the limit how it is to >>>> maintain. >>>> >>>> So I have experimented this weekend to build a prototype based on the >>>> principle of a recursive descent parser >>>> http://en.wikipedia.org/wiki/Recursive_descent_parser >>>> >>>> I at first looked into using a parser framework such as JavaCC and >>>> ANTLR. The former would be able to parse the input, but building the >>>> AST nodes would require to use its tree compiler, which was not maven >>>> exposed. Likewise JavaCC is not really maintained anymore. People on >>>> stackoverflow recommended ANTLR. It has more bells ans whistles, but >>>> as far as I could see ANTLR requires JAR files in the runtime. >>>> >>>> And frankly I just wanted a fairly simple code, that anybody, would be >>>> able to look into and help with. >>>> >>>> So I cracked up some prototype code based on the principle from that >>>> wikipedia article above. >>> >>> >>> >>> -- >>> -- >>> Christian Schneider >>> http://www.liquid-reality.de >>> >>> Open Source Architect >>> Talend Application Integration Division http://www.talend.com >>> >>> >> >> >> > > > -- > Willem > ---------------------------------- > FuseSource > Web: http://www.fusesource.com > Blog: http://willemjiang.blogspot.com (English) > http://jnn.javaeye.com (Chinese) > Twitter: willemjiang > Weibo: willemjiang > -- Claus Ibsen ----------------- FuseSource Email: cib...@fusesource.com Web: http://fusesource.com Twitter: davsclaus, fusenews Blog: http://davsclaus.blogspot.com/ Author of Camel in Action: http://www.manning.com/ibsen/
