.. This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2024 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

.. rst-class:: align-right

built-in predicate

.. index:: pair: logtalk_load/1; Built-in predicate .. _predicates_logtalk_load_1:

logtalk_load/1

Description

::

logtalk_load(File) logtalk_load(Files)

Compiles to disk and then loads to memory a :term:`source file` or a list of source files using the default compiler flag values. The Logtalk source file name extension (by default, .lgt) can be omitted. Source file paths can be absolute, relative to the current directory, or use :term:`library notation`. This predicate can also be used to compile Prolog source files as Logtalk source code. When no recognized Logtalk or Prolog extension is specified, the compiler tries first to append a Logtalk source file extension and then a Prolog source file extension. If that fails, the compiler tries to use the file name as-is. The recognized Logtalk and Prolog file extensions are defined in the :term:`backend adapter files <adapter file>`.

When this predicate is called from the top-level interpreter, relative source file paths are resolved using the current working directory. When the calls are made from a source file, relative source file paths are resolved using the source file directory.

Note that only the errors related to problems in the predicate argument are listed below. This predicate fails on the first error found during compilation of a source file. In this case, no contents of the source file are loaded.

Depending on the :term:`backend Prolog compiler`, the shortcuts {File} or {File1, File2, ...} may be used in alternative. Check the adapter files for the availability of these shortcuts as they are not part of the language (and thus should only be used at the top-level interpreter).

Modes and number of proofs

::

logtalk_load(@source_file_name) - zero_or_one logtalk_load(@list(source_file_name)) - zero_or_one

Errors

| File is a variable: | instantiation_error | Files is a variable or a list with an element which is a variable: | instantiation_error | File, or an element File of the Files list, is neither a variable nor a source file name: | type_error(source_file_name, File) | File, or an element File of the Files list, uses library notation but the library does not exist: | existence_error(library, Library) | File or an element File of the Files list, does not exist: | existence_error(file, File)

Examples

::

% compile and load the "set" source file in the % current directory: | ?- logtalk_load(set).

% compile and load the "tree" source file in the % "types" library directory: | ?- logtalk_load(types(tree)).

% compile and load the "listp" and "list" source % files in the current directory: | ?- logtalk_load([listp, list]).

.. seealso::

:ref:predicates_logtalk_compile_1, :ref:predicates_logtalk_compile_2, :ref:predicates_logtalk_load_2, :ref:predicates_logtalk_make_0, :ref:predicates_logtalk_make_1, :ref:predicates_logtalk_library_path_2