From 7fce4340deb0b6337bbd7ef6071ee42529db222d Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Fri, 13 Jul 2018 13:09:26 +0100
Subject: vaguely parse commands

---
 lib/Getopt/Dakkar/Role/Command.pm | 76 +++++++++++++++++++++++++++++++++++++++
 lib/Getopt/Dakkar/Role/Piece.pm   | 22 ++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 lib/Getopt/Dakkar/Role/Command.pm
 create mode 100644 lib/Getopt/Dakkar/Role/Piece.pm

(limited to 'lib/Getopt/Dakkar/Role')

diff --git a/lib/Getopt/Dakkar/Role/Command.pm b/lib/Getopt/Dakkar/Role/Command.pm
new file mode 100644
index 0000000..b96c410
--- /dev/null
+++ b/lib/Getopt/Dakkar/Role/Command.pm
@@ -0,0 +1,76 @@
+package Getopt::Dakkar::Role::Command;
+use Getopt::Dakkar::Style qw(role);
+with 'Getopt::Dakkar::Role::Piece';
+# VERSION
+# ABSTRACT: a command
+
+has options => ( is => 'ro', isa => ArrayRef, default => sub { [] } );
+has parameters => ( is => 'ro', isa => ArrayRef, default => sub { [] } );
+has subcommands => ( is => 'ro', isa => ArrayRef, default => sub { [] } );
+
+sub parse($self,$args=undef) {
+    my $stash = $self->_parse($args);
+    if (my $op = $self->op) {
+        $stash->$op();
+    }
+}
+
+sub _parse($self,$args,$stash=undef) {
+    my $argpack = Getopt::Dakkar::ArgPack->new({getopt=>$self});
+    while ($args->@*) {
+        my $this = $args->[0];
+
+        if ($self->_looks_like_option($this)
+                and not $self->_is_terminator($this)) {
+            if (my $match = $self->_match_option($this)) {
+                # ->parse will remove $this (or parts of
+                # it, if it's a bundle) and shift its own arguments
+                # out of $args
+                my $option = $match->parse($args,$self);
+                $argpack->options->{$match->name} = $option;
+            }
+            else {
+                Getopt::Dakkar::X::BadOption->throw({
+                    input => $this,
+                });
+            }
+        }
+        elsif (my $match = $self->_match_subcommand($this)) {
+            shift $args->@*;
+            $stash //= $self->_make_stash($argpack);
+            my $op = $self->op;
+            $stash->$op($argpack);
+            $match->_parse($args,$stash);
+        }
+        else {
+            shift $args->@* if $self->_is_terminator($this);
+            for my $parameter ($self->parameters->@*) {
+                # ->parse will remove the argument(s) from $args
+                my $argument = $parameter->parse($args,$self);
+                $argpack->arguments->{$argument->name} = $argument;
+            }
+
+            # if we've parsed all arguments, and there's still stuff
+            # in the input, something is wrong: complain
+            if ($args->@*) {
+                Getopt::Dakkar::X::ExtraArgs->throw({
+                    args => $args,
+                });
+            }
+        }
+    }
+    return $stash;
+}
+
+sub _is_terminator($self,$arg) { return $arg eq q{--} }
+sub _looks_like_option($self,$arg) { return $arg =~ /^-/ }
+sub _match_option($self,$arg) {
+    for my $option ($self->options->@*) {
+        return $option if $option->match($arg);
+    }
+}
+sub _match_subcommand($self,$arg) {
+    for my $subcommand ($self->subcommands->@*) {
+        return $subcommand if $subcommand->match($arg);
+    }
+}
diff --git a/lib/Getopt/Dakkar/Role/Piece.pm b/lib/Getopt/Dakkar/Role/Piece.pm
new file mode 100644
index 0000000..d981095
--- /dev/null
+++ b/lib/Getopt/Dakkar/Role/Piece.pm
@@ -0,0 +1,22 @@
+package Getopt::Dakkar::Role::Piece;
+use Getopt::Dakkar::Style qw(role);
+# VERSION
+# ABSTRACT: a piece
+
+has class => ( is => 'ro', isa => ClassName, default => 'Getopt::Dakkar::Stash' );
+has object => ( is => 'ro', isa => Object );
+has op => ( is => 'ro', isa => Str|CodeRef );
+
+sub make_stash($self,$argpack) {
+    if (my $o = $self->object) { return $o }
+
+    my $class = use_module($self->class);
+    if (my $from_argpack = $class->can('new_from_argpack')) {
+        return $class->$from_argpack($argpack);
+    }
+    else {
+        return $class->new();
+    }
+}
+
+requires 'parse';
-- 
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