Invoking the FhirPath Compiler directly
The FhirPath compiler is just another public class in the Hl7.FhirPath
namespace. It has a constructor which takes an argument of type SymbolTable
- the key
to full control over the installed dialect:
var symbolTable = new SymbolTable()
.AddStandardFP()
.AddFhirExtensions();
var newCompiler = new FhirPathCompiler(symbolTable);
You can now use the compiler to:
Compile()
an expression to a ready-to-execute delegate (calledCompiledExpression
)Parse()
an expression to an abstract symbol tree, for display or debugging purposes
Invoking the CompiledExpression
is equivalent to using the Select()
function described above. The other functions, like IsBoolean
are also available (as extension methods).