JarCasting#CsdlTools
Tools for working with DataSift's Csdl query language
##Csdl Parser
You can start parsing Csdl straight away. Just use the Csdl.parse method
val csdl = Csdl.parse("interaction.content contains \"cheese\"")
The object you'll get back is some form of CsdlBody. Using pattern matching you can decide what to do next.
csdl match {
case And(l, r) =>
println("The left hand side is: %s" format l)
println("The right hand side is: %s" format r)
case _ => // ..
The hierarchy of AST classes is:
CsdlNode
|- CsdlBody
| |- And
| |- Or
| |- Not
| |- CsdlTaggedBody
| |- Returns
| |- Rule
| |- Stream
|- Argument
| |- Operator
| |- Target
| |- Text
| |- TextList
|- Tag
The parser is implemented using Scala's built-in parser combinators and doesn't provide very good error-handling so isn't too good for use inside editors, etc. It can be pretty useful for automated analysis and optimzation of CSDL we already know is well-formed.
##Future Goals
Right now I'm interested in adding the following:
- Conversion to other languages
- Optimization
- Pretty-printing
- Versioning, to automatically upgrade statements to newer version of the language