The SetLanguageAttribute command sets and clears language attributes. Multiple arguments are processed sequentially. If an argument has the form str=val, then the language attribute str is assigned the value val. If the language attribute str already has a value, it is overwritten. If an argument has the form str, then the language attribute str is cleared.

The GetLanguageAttribute command retrieves the current value of the language attribute str.

The ApplyLanguageAttribute behaves similarly to GetLanguageAttribute: if the value of language attribute str is of type algebraic or boolean, it is returned. However, if the value of language attribute str is of type procedure, it is applied to any remaining arguments of ApplyLanguageAttribute, and the result is returned.

For more information about language attributes and their function within CodeGeneration language definitions, see Language Attributes.

cg := echo('hello');

LanguageDefinition[Define]("IfSampleLanguage", extend="default",
    SetLanguageAttribute(
        "Procedure_Begin" = proc(rettype, params)
            (Printer:-Indent(), rettype, " ",
             Printer:-GetScopeName()," ", params,
             Printer:-Endline()) end proc,
        "Procedure_ParametersInBody" = false,
        "Procedure_End" = "",
        "ParameterSequence_Begin" = "(",
        "ParameterSequence_Delimiter" = ",",
        "ParameterSequence_End" = ")",
        "If_Begin" = proc(x)
             (Printer:-Indent(), "if (",x,")",
              Printer:-Endline()) end proc,
        "If_Elsif" = proc(x)
             (Printer:-Indent(), "else if (",x,")",
              Printer:-Endline()) end proc,
        "If_Else"  = proc()
             (Printer:-Indent(), "else",
              Printer:-Endline()) end proc,
        "If_End"   = ""
    )
):

my_signum := proc(x) if x>0 then 1 elif x = 0 then 0 else -1 end if: end proc:

integer my_signum (integer x)

  if (0 < x)
    Return(1);
  else if (x = 0)
    Return(0);
  else
    Return(-1);