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# Copyright (c) 1997-2024
# Ewgenij Gawrilow, Michael Joswig, and the polymake team
# Technische Universität Berlin, Germany
# https://polymake.org
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version: http://www.gnu.org/licenses/gpl.txt.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#-------------------------------------------------------------------------------
require Polymake::Core::Shell;
use strict;
use namespaces;
use warnings qw(FATAL void syntax misc);
# A limited replacement for Shell in scenarions without direct access to a terminal.
# Mostly used for tests and connections to alternative front-ends like Jupyter.
package Polymake::Core::Shell::Mock;
use Polymake::Struct (
'%Attribs',
'$partial_input',
'@completion_proposals | help_topics',
'$completion_append_character',
'$line_cnt',
'$completion_offset',
);
sub term { shift }
sub interactive { 0 }
sub complete {
my ($self, $string) = @_;
$self->Attribs->{line_buffer} = $string;
$self->Attribs->{point} = length($string);
$self->Attribs->{filename_completion_function} = \&filename_completion;
$self->line_cnt = 1;
@{$self->completion_proposals} = ();
$self->completion_offset = 0;
Shell::all_completions($self);
}
sub completion_matches : method {
my ($self, $prefix, $func) = @_;
my @result = $func->($self, $prefix);
if (@result > 1) {
# true readline function inserts the common prefix here, but we never use it,
# so it can have an arbitrary value
unshift @result, undef;
}
@result;
}
sub filename_completion {
my ($self, $prefix) = @_;
my @files = glob(qq{"$prefix*"});
if ($prefix =~ m|^~/|) {
$_ =~ s|^$ENV{HOME}|~| for @files;
}
@files
}
sub context_help {
my ($self, $string, $pos) = @_;
$self->partial_input = $string;
while ($pos >= 0 && Completion::get_help_topics($self, $pos)) {
$_[2] = $pos = pos($self->partial_input)-1;
$self->help_topics = [ grep { $_->annex->{display} !~ /^\s*noshow\s*$/ } @{$self->help_topics} ];
return 1 if @{$self->help_topics};
}
}
sub process_input {
my ($self, $input) = @_;
local unshift @INC, $self;
$self->partial_input = $input;
{ local $Scope = new Scope(); package Polymake::User; do "input:"; 1; }
if ($self->line_cnt == -1) {
# just an incomplete input
$@ = "";
} else {
if ($self->line_cnt == -3) {
$@ = delete $self->Attribs->{parse_errors};
}
$@ =~ s{ at input line \d+[.,]}{}g;
}
return $self->line_cnt >= 2;
}
sub Polymake::Core::Shell::Mock::INC {
if ($_[1] eq "input:") {
my $self=$_[0];
$self->line_cnt=0;
delete $self->Attribs->{parse_errors};
(input_preamble(1), \&get_line, $self)
} else {
$User::application->INC($_[1]);
}
}
# as a side effect, sets line_cnt depending on the syntax correctness of the input:
# >=2 when at least one non-empty input line and no syntax errors detected
# -1 for syntactically correct but incomplete input
# -2 for syntax errors reported in $@
# -3 for syntax errors preserved in Attribs->{parse_errors}
sub get_line {
my ($l, $self)=@_;
if ($self->line_cnt==0) {
inject_error_preserving_source_filter();
}
++$self->line_cnt;
$self->partial_input =~ s/\A.*(?:\n|\Z)//m;
if (length($&) != 0) {
$_ .= $&;
} else {
remove_error_preserving_source_filter();
if (my $err=get_preserved_errors()) {
$self->Attribs->{parse_errors}=$err;
$self->line_cnt=-3;
} elsif (($l=line_continued()) != 0) {
$self->line_cnt= $l<0 ? -2 : -1;
}
}
return length;
}
1
# Local Variables:
# cperl-indent-level:3
# indent-tabs-mode:nil
# End:
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