Prolog Source Code Layout Restrictions
There are some restrictions on program layout, which are necessary for
<ESC> k p (compiling a procedure), <ESC> . (find-definition)
and for indentation in
prolog mode to work properly. In order for these commands to function
correctly, you must:
- Group Prolog clauses of the same name and arity together. That is, do
not intersperse clauses of one procedure with clauses of another. Normally
breaching this restriction will cause a style warning
(see bas-lod-sty).
- Start the heads of all Prolog clauses at the beginning of the line;
indent any additional lines for those clauses. Within prolog mode the
TAB and the <LFD> can be used for indenting the current line
as prolog code.
- If a comment continues onto another line, indent the continuation
line(s).
- Do not write clause definitions that use operators in the
heads of the clauses. For example, if you want to define clauses for
+/2,
then write the head of the clause in the form +(A, B) and not A + B.