The “Algol 60” language for DrScheme implements the language defined by the “Revised Report on the Algorithmic Language Algol 60,” edited by Peter Naur.
Although Algol 60 is mainly provided as a DrScheme language, include-algol supports limited use of Algol 60 programs in larger programs.
Includes the Algol 60 program indicated by path-string as an expression in a Scheme program. The included Algol 60 program is closed (i.e., it doesn’t see any bindings in the included context), and the result is always #<void>.
The DrScheme and include-algol implementation departs from the Algol 60 specification in the following minor ways:
Strings are not permitted to contain nested quotes.
Identifiers cannot contain whitespace.
Argument separators are constrained to be identifiers (i.e., they cannot be keywords, and they cannot consist of multiple identifiers separated by whitespace.)
Numbers containing exponents (using the “10” subscript) are not supported.
Identifiers and keywords are case-sensitive. The boldface/underlined keywords of the report are represented by the obvious character sequence, as are most operators. A few operators do not fit into ASCII, and they are mapped as follows:
|less or equal <=|
|greater or equal >=|
|not equal !=|
In addition to the standard functions, the following output functions are supported:
|prints(E) prints the string E|
|printsln(E) prints the string E followed by a newline|
|printn(E) prints the number E|
|printnln(E) prints the number E followed by a newline|
A prompt in DrScheme’s Interactions window accepts whole programs only for the Algol 60 language.