Oberon-2

Oberon-2 is a programming language created in 1991. Oberon-2 is an extension of the original Oberon programming language that adds limited reflection and object-oriented programming facilities, open arrays as pointer base types, read-only field export and reintroduces the FOR loop from Modula-2. It was developed in 1991 at ETH Zurich by Niklaus Wirth and Hanspeter Mössenböck, who is now at Institut für Systemsoftware (SSW) of the University of Linz, Austria. Oberon-2 is a superset of Oberon, and is fully compatible with it. Read more on Wikipedia...

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• Oberon-2 ranks in the top 25% of languages
• the Oberon-2 wikipedia page
• Oberon-2 first appeared in 1991
• Read more about Oberon-2 on Semantic Scholar
• See also: oberon, modula-2, pascal, go, object-oberon, smalltalk, python, java, algol, yacc, javascript, powerpc
• Have a question about Oberon-2 not answered here? Email me and let me know how I can help.

Example code from Wikipedia:

Module        = MODULE ident ";" [ImportList] DeclSeq [BEGIN StatementSeq] END ident ".".
ImportList    = IMPORT [ident ":="] ident {"," [ident ":="] ident} ";".
DeclSeq       = { CONST {ConstDecl ";" } | TYPE {TypeDecl ";"} | VAR {VarDecl ";"}} {ProcDecl ";" | ForwardDecl ";"}.
ConstDecl     = IdentDef "=" ConstExpr.
TypeDecl      = IdentDef "=" Type.
VarDecl       = IdentList ":" Type.
ProcDecl      = PROCEDURE [Receiver] IdentDef [FormalPars] ";" DeclSeq [BEGIN StatementSeq] END ident.
ForwardDecl   = PROCEDURE "^" [Receiver] IdentDef [FormalPars].
FormalPars    = "(" [FPSection {";" FPSection}] ")" [":" Qualident].
FPSection     = [VAR] ident {"," ident} ":" Type.
Receiver      = "(" [VAR] ident ":" ident ")".
Type          = Qualident
              | ARRAY [ConstExpr {"," ConstExpr}] OF Type
              | RECORD ["("Qualident")"] FieldList {";" FieldList} END
              | POINTER TO Type
              | PROCEDURE [FormalPars].
FieldList     = [IdentList ":" Type].
StatementSeq  = Statement {";" Statement}.
Statement     = [ Designator ":=" Expr
              | Designator ["(" [ExprList] ")"]
              | IF Expr THEN StatementSeq {ELSIF Expr THEN StatementSeq} [ELSE StatementSeq] END
              | CASE Expr OF Case {"|" Case} [ELSE StatementSeq] END
              | WHILE Expr DO StatementSeq END
              | REPEAT StatementSeq UNTIL Expr
              | FOR ident ":=" Expr TO Expr [BY ConstExpr] DO StatementSeq END
              | LOOP StatementSeq END
              | WITH Guard DO StatementSeq {"|" Guard DO StatementSeq} [ELSE StatementSeq] END
              | EXIT
              | RETURN [Expr]
      ].	
Case          = [CaseLabels {"," CaseLabels} ":" StatementSeq].
CaseLabels    = ConstExpr [".." ConstExpr].
Guard         = Qualident ":" Qualident.
ConstExpr     = Expr.
Expr          = SimpleExpr [Relation SimpleExpr].
SimpleExpr    = ["+" | "-"] Term {AddOp Term}.
Term          = Factor {MulOp Factor}.
Factor        = Designator ["(" [ExprList] ")"] | number | character | string | NIL | Set | "(" Expr ")" | " ~ " Factor.
Set           = "{" [Element {"," Element}] "}".
Element       = Expr [".." Expr].
Relation      = "=" | "#" | "<" | "<=" | ">" | ">=" | IN | IS.
AddOp         = "+" | "-" | OR.
MulOp         = "*" | "/" | DIV | MOD | "&".
Designator    = Qualident {"." ident | "[" ExprList "]" | " ^ " | "(" Qualident ")"}.
ExprList      = Expr {"," Expr}.
IdentList     = IdentDef {"," IdentDef}.
Qualident     = [ident "."] ident.
IdentDef      = ident [" * " | " - "].

Last updated August 9th, 2020

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