A simple pretty-printer for Ciao programs
Author(s): The CLIP Group.
This library module writes out to standard output a clause or a list of clauses.
Usage and interface
- Library usage:
:- use_module(library(pretty_print)). - Exports:
- Predicates:
pretty_print/2, pretty_print/3, pretty_print/4.
- Predicates:
- Imports:
Documentation on exports
PREDICATE
Usage:pretty_print(Cls,Flags)
Prints each clause in the list Cls after numbering its variables.
- The following properties should hold at call time:
(pretty_print:clauses/1)pretty_print:clauses(Cls)
(basic_props:list/2)Flags is a list of flags.
PREDICATE
Usage:pretty_print(Cls,Flags,Ds)
Prints each clause in the list Cls after using the corresponding variable names dictionary in Ds to name its variables.
- The following properties should hold at call time:
(pretty_print:clauses/1)pretty_print:clauses(Cls)
(basic_props:list/2)Flags is a list of flags.
(vndict:varnamedict/1)Ds is a dictionary of variable names.
Documentation on internals
REGTYPE
A regular type, defined as follows:
clauses([]).
clauses([_1|_2]) :-
clause(_1),
clauses(_2).
clauses(_1) :-
clause(_1).
REGTYPE
A regular type, defined as follows:
clause(_1) :-
clterm(_1).
clause((_1,_2)) :-
clterm(_1),
term(_2).
REGTYPE
A regular type, defined as follows:
clterm(clause(_1,_2)) :-
callable(_1),
body(_2).
clterm(directive(_1)) :-
body(_1).
clterm((_1:-_2)) :-
callable(_1),
body(_2).
clterm(_1) :-
callable(_1).
REGTYPE
A well formed body, including cge expressions and &-concurrent expressions. The atomic goals may or may not have a key in the form ^(goal:any), and may or may not be module qualified, but if they are it has to be in the form ^(^(moddesc:goal):any).
Usage:body(X)
X is a printable body.
REGTYPE
A keyword ask/1 flags whether to output asks or whens and nl/1 whether to separate clauses with a blank line or not.
Usage:flag(X)
X is a flag for the pretty-printer.
Known bugs and planned improvements
- 2.- If the priority of and operator, &/1 or &/2, is redefined with lower priority than :-/2 or ./1, the written term is incorrect because it does not include parenthesis to make Ciao associate and operator first.
