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DEL Syntax

Notes for NLS Users​

  • All statements in this branch which are not part of the compiler must end with a period.

  • To compile the DEL compiler:

    • Set this pattern for the content analyzer ( (symbol for up arrow)P1 SE(P1) <-"-;). The pointer "del" is on the first character of pattern.

    • Jump to the first statement of the compiler. The pointer "c" is on this statement.

    • And output the compiler to file ( '/A-DEL' ). The pointer "f" is on the name of the file for the compiler output -

Programs​

Syntax​

-meta file (k=100.m=300,n=20,s=900)
file = mesdecl $declaration $procedure "FINISH";
procedure =
  procname (
     (
        type "FUNCTION" /
        "PROCEDURE" ) .id (type .id / -empty)) /
     "CO-ROUTINE") ' /
  $declaration labeledst $(labeledst ';) "endp.";
labeledst = ((left arrow symbol).id ': / .empty) statement;
type = "INTEGER" / "REAL" ;
procname = .id;

  • Functions are differentiated from procedures to aid compilers in better code production and run time checks.

    • Functions return values.

    • Procedures do not return values.

  • Co-routines do not have names or arguments. Their initial envocation points are given the pipe declaration.

  • It is not clear just how global declarations are to be??