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|library(listing): List programs and pretty print clauses|
This module implements listing code from the internal representation in a human readable format.
Layout can be customized using
effective settings can be listed using list_settings/1
as illustrated below. Settings can be changed using set_setting/2.
?- list_settings(listing). ======================================================================== Name Value (*=modified) Comment ======================================================================== listing:body_indentation 4 Indentation used goals in the body listing:tab_distance 0 Distance between tab-stops. ...
mymodule, use one of the calls below.
?- mymodule:listing. ?- listing(mymodule:_).
//Arity) Lists the indicated predicate. This also outputs relevant declarations, such as multifile/1 or dynamic/1.
?- listing(append(, _, _)). lists:append(, L, L).
The following options are defined:
source, for each clause that is associated to a source location the system tries to restore the original variable names. This may fail if macro expansion is not reversible or the term cannot be read due to different operator declarations. In that case variable names are generated.
false), extract the lines from the source files that produced the clauses, i.e., list the original source text rather than the decompiled clauses. Each set of contiguous clauses is preceded by a comment that indicates the file and line of origin. Clauses that cannot be related to source code are decompiled where the comment indicates the decompiled state. This is notably practical for collecting the state of multifile predicates. For example:
?- listing(file_search_path, [source(true)]).
Variable names are by default generated using numbervars/4
using the option
singletons(true). This names the variables A, B,
... and the singletons _. Variables can be named explicitly
by binding them to a term
'$VAR'(Name), where Name
is an atom denoting a valid variable name (see the option
well as by using the
variable_names(Bindings) option from write_term/2.
Options processed in addition to write_term/2 options: