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|
package Text::Xslate::Syntax::Handlebars;
use Any::Moose;
use Carp 'confess';
use Text::Xslate::Util qw($STRING neat p);
extends 'Text::Xslate::Parser';
sub _build_identity_pattern { qr/[A-Za-z_][A-Za-z0-9_]*/ }
sub _build_comment_pattern { qr/\![^;]*/ }
sub _build_line_start { undef }
sub _build_tag_start { '{{' } # XXX needs to be modifiable
sub _build_tag_end { '}}' } # XXX needs to be modifiable
sub _build_shortcut_table { +{} }
sub split_tags {
my $self = shift;
my ($input) = @_;
my $tag_start = $self->tag_start;
my $tag_end = $self->tag_end;
# 'text' is a something without newlines
# follwoing a newline, $tag_start, or end of the input
my $lex_text = qr/\A ( [^\n]*? (?: \n | (?= \Q$tag_start\E ) | \z ) ) /xms;
my $lex_comment = $self->comment_pattern;
my $lex_code = qr/(?: $lex_comment | (?: $STRING | [^'"] ) )/xms;
my @chunks;
my $close_tag;
while ($input) {
if ($close_tag) {
my $start = 0;
my $pos;
while(($pos = index $input, $close_tag, $start) >= 0) {
my $code = substr $input, 0, $pos;
$code =~ s/$lex_code//g;
if(length($code) == 0) {
last;
}
$start = $pos + 1;
}
if ($pos >= 0) {
my $code = substr $input, 0, $pos, '';
$input =~ s/\A\Q$close_tag//
or die "Oops!";
push @chunks, [
($close_tag eq '}}}' ? 'raw_code' : 'code'),
$code
];
undef $close_tag;
}
else {
last; # the end tag is not found
}
}
elsif ($input =~ s/\A\Q$tag_start//) {
if ($tag_start eq '{{' && $input =~ s/\A\{//) {
$close_tag = '}}}';
}
else {
$close_tag = $tag_end;
}
}
elsif ($input =~ s/\A$lex_text//) {
push @chunks, [ text => $1 ];
}
else {
confess "Oops: unreached code, near " . p($input);
}
}
if ($close_tag) {
# calculate line number
my $orig_src = $_[0];
substr $orig_src, -length($input), length($input), '';
my $line = ($orig_src =~ tr/\n/\n/);
$self->_error("Malformed templates detected",
neat((split /\n/, $input)[0]), ++$line,
);
}
return @chunks;
}
sub preprocess {
my $self = shift;
my ($input) = @_;
my @chunks = $self->split_tags($input);
my $code = '';
for my $chunk (@chunks) {
my ($type, $content) = @$chunk;
if ($type eq 'text') {
$content =~ s/(["\\])/\\$1/g;
$code .= qq{print_raw "$content";\n};
}
elsif ($type eq 'code') {
$code .= qq{$content;\n};
}
elsif ($type eq 'raw_code') {
$code .= qq{mark_raw $content;\n};
}
else {
$self->_error("Oops: Unknown token: $content ($type)");
}
}
return $code;
}
# XXX advance has some syntax special cases in it, probably need to override
# it too eventually
sub init_symbols {
my $self = shift;
my $name = $self->symbol('(name)');
$name->set_led($self->can('led_name'));
$name->lbp(1);
$self->infix('.', 256, $self->can('led_dot'));
$self->infix('/', 256, $self->can('led_dot'));
}
sub nud_name {
my $self = shift;
my ($symbol) = @_;
if ($symbol->is_defined) {
return $self->SUPER::nud_name(@_);
}
else {
return $self->nud_variable(@_);
}
}
sub led_name {
my $self = shift;
my ($symbol, $left) = @_;
if ($left->arity eq 'name') {
return $self->call($left, $symbol->nud($self));
}
else {
...
}
}
sub led_dot {
my $self = shift;
my ($symbol, $left) = @_;
my $dot = $self->make_field_lookup($left, $self->token, $symbol);
$self->advance;
return $dot;
}
sub make_field_lookup {
my $self = shift;
my ($var, $field, $dot) = @_;
if (!$self->is_valid_field($field)) {
$self->_unexpected("a field name", $field);
}
$dot ||= $self->symbol('.');
return $dot->clone(
arity => 'field',
first => $var,
second => $field->clone(arity => 'literal'),
);
}
if (0) {
require Devel::STDERR::Indent;
my @stack;
for my $method (qw(statements statement expression_list expression)) {
before $method => sub {
warn "entering $method";
push @stack, Devel::STDERR::Indent::indent();
};
after $method => sub {
pop @stack;
warn "leaving $method";
};
}
after advance => sub {
my $self = shift;
warn $self->token->id;
};
around parse => sub {
my $orig = shift;
my $self = shift;
my $ast = $self->$orig(@_);
use Data::Dump; ddx($ast);
return $ast;
};
around preprocess => sub {
my $orig = shift;
my $self = shift;
my $code = $self->$orig(@_);
warn $code;
return $code;
};
}
__PACKAGE__->meta->make_immutable;
no Any::Moose;
1;
|
