From c964148db9790676e892265327f567939619c349 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Fri, 28 Sep 2012 17:32:46 -0500
Subject: get blocks working

---
 lib/Text/Handlebars.pm               | 51 +++++++++++++++++++++
 lib/Text/Handlebars/Compiler.pm      | 38 ++++++++++++++++
 lib/Text/Xslate/Syntax/Handlebars.pm | 87 ++++++++++++++++++++++++++++++++++++
 3 files changed, 176 insertions(+)
 create mode 100644 lib/Text/Handlebars.pm
 create mode 100644 lib/Text/Handlebars/Compiler.pm

(limited to 'lib')

diff --git a/lib/Text/Handlebars.pm b/lib/Text/Handlebars.pm
new file mode 100644
index 0000000..bad8c64
--- /dev/null
+++ b/lib/Text/Handlebars.pm
@@ -0,0 +1,51 @@
+package Text::Handlebars;
+use strict;
+use warnings;
+
+use base 'Text::Xslate';
+
+sub default_functions {
+    my $class = shift;
+    return {
+        %{ $class->SUPER::default_functions(@_) },
+        '(is_array)' => sub {
+            my ($val) = @_;
+            return ref($val) && ref($val) eq 'ARRAY';
+        },
+        '(make_array)' => sub {
+            my ($length) = @_;
+            return [(undef) x $length];
+        },
+        '(new_vars_for)' => sub {
+            my ($vars, $value, $i) = @_;
+            $i = 0 unless defined $i; # XXX
+
+            if (my $ref = ref($value)) {
+                if (defined $ref && $ref eq 'ARRAY') {
+                    die "no iterator cycle provided?"
+                        unless defined $i;
+                    $value = $value->[$i];
+                    $ref   = ref($value);
+                }
+
+                die "invalid value: $value"
+                    if !defined($ref) || $ref ne 'HASH';
+
+                return $value;
+            }
+            else {
+                return $vars;
+            }
+        },
+    };
+}
+
+sub options {
+    my $class = shift;
+
+    my $options = $class->SUPER::options(@_);
+    $options->{compiler} = 'Text::Handlebars::Compiler';
+    return $options;
+}
+
+1;
diff --git a/lib/Text/Handlebars/Compiler.pm b/lib/Text/Handlebars/Compiler.pm
new file mode 100644
index 0000000..2150bba
--- /dev/null
+++ b/lib/Text/Handlebars/Compiler.pm
@@ -0,0 +1,38 @@
+package Text::Handlebars::Compiler;
+use Any::Moose;
+
+extends 'Text::Xslate::Compiler';
+
+has '+syntax' => (
+    default => 'Handlebars',
+);
+
+sub _generate_block {
+    my $self = shift;
+    my ($node) = @_;
+
+    return (
+        $self->_localize_vars($node->first),
+        (map { $self->compile_ast($_) } @{ $node->second }),
+    );
+}
+
+if (0) {
+    our $_recursing;
+    around compile_ast => sub {
+        my $orig = shift;
+        my $self = shift;
+
+        my @ast = do {
+            local $_recursing = 1;
+            $self->$orig(@_);
+        };
+        use Data::Dump; ddx(\@ast) unless $_recursing;
+        return @ast;
+    };
+}
+
+__PACKAGE__->meta->make_immutable;
+no Any::Moose;
+
+1;
diff --git a/lib/Text/Xslate/Syntax/Handlebars.pm b/lib/Text/Xslate/Syntax/Handlebars.pm
index 3f63f68..0cfc1e0 100644
--- a/lib/Text/Xslate/Syntax/Handlebars.pm
+++ b/lib/Text/Xslate/Syntax/Handlebars.pm
@@ -127,8 +127,17 @@ sub init_symbols {
     $name->set_led($self->can('led_name'));
     $name->lbp(1);
 
+    my $for = $self->symbol('(for)');
+    $for->arity('for');
+
+    my $iterator = $self->symbol('(iterator)');
+    $iterator->arity('iterator');
+
     $self->infix('.', 256, $self->can('led_dot'));
     $self->infix('/', 256, $self->can('led_dot'));
+
+    $self->symbol('#')->set_std($self->can('std_block'));
+    $self->prefix('/', 0)->is_block_end(1);
 }
 
 sub nud_name {
@@ -166,6 +175,73 @@ sub led_dot {
     return $dot;
 }
 
+sub std_block {
+    my $self = shift;
+    my ($symbol) = @_;
+
+    if ($self->token->arity ne 'name') {
+        $self->_unexpected("block name", $self->token);
+    }
+    my $name = $self->token->nud($self);
+    $self->advance;
+    $self->advance(';');
+
+    my $body = $self->statements;
+
+    $self->advance('/');
+
+    if ($self->token->arity ne 'name') {
+        $self->_unexpected("block name", $self->token);
+    }
+    if ($self->token->id ne $name->id) {
+        $self->_unexpected('/' . $name->id, $self->token);
+    }
+
+    $self->advance;
+
+    my $iterations = $self->make_ternary(
+        $self->call('(is_array)', $name->clone),
+        $name->clone,
+        $self->make_ternary(
+            $name->clone,
+            $self->call(
+                '(make_array)',
+                $self->symbol('(literal)')->clone(id => 1),
+            ),
+            $self->call(
+                '(make_array)',
+                $self->symbol('(literal)')->clone(id => 0),
+            ),
+        ),
+    );
+
+    my $loop_var = $self->symbol('(variable)')->clone(id => '(block)');
+
+    my $body_block = [
+        $symbol->clone(
+            arity  => 'block',
+            first  => [
+                $self->call(
+                    '(new_vars_for)',
+                    $self->symbol('(vars)')->clone(arity => 'vars'),
+                    $name->clone,
+                    $self->symbol('(iterator)')->clone(
+                        id    => '$~(block)',
+                        first => $loop_var,
+                    ),
+                ),
+            ],
+            second => $body,
+        ),
+    ];
+
+    return $self->symbol('(for)')->clone(
+        first  => $iterations,
+        second => [$loop_var],
+        third  => $body_block,
+    );
+}
+
 sub make_field_lookup {
     my $self = shift;
     my ($var, $field, $dot) = @_;
@@ -183,6 +259,17 @@ sub make_field_lookup {
     );
 }
 
+sub make_ternary {
+    my $self = shift;
+    my ($if, $then, $else) = @_;
+    return $self->symbol('?:')->clone(
+        arity  => 'if',
+        first  => $if,
+        second => $then,
+        third  => $else,
+    );
+}
+
 if (0) {
     require Devel::STDERR::Indent;
     my @stack;
-- 
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