TODO: write docs

T if and only if none of my args evaluate to either F or NIL, else F.

In beowulf.host principally because I don’t yet feel confident to define varargs functions in Lisp.

If a is an association list such as the one formed by PAIRLIS in the above example, then assoc will produce the first pair whose first term is x. Thus it is a table searching function.

All args are assumed to be beowulf.cons-cell/ConsCell objects. See page 12 of the Lisp 1.5 Programmers Manual.

NOTE THAT this function is overridden by an implementation in Lisp, but is currently still present for bootstrapping.

Returns T if and only if the argument x is bound to an atom; else F. It is not clear to me from the documentation whether (ATOM 7) should return T or F. I’m going to assume T.

The convention of returning F from predicates, rather than NIL, is going to tie me in knots. This is a variant of ATOM which returns NIL on failure.

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

Return the item indicated by the first pointer of a pair. NIL is treated specially: the CAR of NIL is NIL.

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

TODO: write docs

Return the item indicated by the second pointer of a pair. NIL is treated specially: the CDR of NIL is NIL.

Construct a new instance of cons cell with this car and cdr.

Return T if object o is a cons cell, else F.

NOTE THAT this is an extension function, not available in strct mode. I believe that Lisp 1.5 did not have any mechanism for testing whether an argument was, or was not, a cons cell.

Bootstrap-only version of DEFINE which, post boostrap, can be overwritten in LISP.

The single argument to DEFINE should be an assoc list which should be nconc’ed onto the front of the oblist. Broadly, (SETQ OBLIST (NCONC ARG1 OBLIST))

TODO: write docs

Open the page for this symbol in the Lisp 1.5 manual, if known, in the default web browser.

NOTE THAT this is an extension function, not available in strct mode.

Returns T if and only if both x and y are bound to the same atom, else NIL.

This is a predicate that is true if its two arguments are identical S-expressions, and false if they are different. (The elementary predicate EQ is defined only for atomic arguments.) The definition of EQUAL is an example of a conditional expression inside a conditional expression.

NOTE: returns F on failure, not NIL

Throw an error

TODO: write docs

Generate a unique symbol.

TODO: write docs

Are we in lax mode? If so. return true; is not, throw an exception with this symbol.

TODO: write docs

TODO: write docs

Not part of LISP 1.5: T if o is NIL, else NIL.

Returns T if and only if the argument x is bound to NIL; else F.

TODO: write docs

Return a list of the symbols currently bound on the object list.

NOTE THAT in the Lisp 1.5 manual, footnote at the bottom of page 69, it implies that an argument can be passed but I’m not sure of the semantics of this.

This function gives the list of pairs of corresponding elements of the lists x and y, and APPENDs this to the list a. The resultant list of pairs, which is like a table with two columns, is called an association list.

Eessentially, it builds the environment on the stack, implementing shallow binding.

All args are assumed to be beowulf.cons-cell/ConsCell objects. See page 12 of the Lisp 1.5 Programmers Manual.

NOTE THAT this function is overridden by an implementation in Lisp, but is currently still present for bootstrapping.

TODO: write docs

I’m not certain from the documentation whether Lisp 1.5 QUOTIENT returned the integer part of the quotient, or a realnum representing the whole quotient. I am for now implementing the latter.

TODO: write docs

Replace the CAR pointer of this cell with this value. Dangerous, should really not exist, but does in Lisp 1.5 (and was important for some performance hacks in early Lisps)

Replace the CDR pointer of this cell with this value. Dangerous, should really not exist, but does in Lisp 1.5 (and was important for some performance hacks in early Lisps)

Implementation of SET in Clojure. Add to the oblist a binding of the value of var to the value of val. NOTE WELL: this is not SETQ!

TODO: write docs

TODO: write docs

Add this symbol s to the set of symbols currently being traced. If s is not a symbol, does nothing.

Symbols currently being traced.

Return true iff s is a symbol currently being traced, else nil.

Universal access function; l is expected to be an arbitrary LISP list, path a (clojure) list of the characters a and d. Intended to make declaring all those fiddly #'c[ad]+r' functions a bit easier

TODO: write docs