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PERLANCAR HERNAN HIDEAKIO KOVENSKY GETTY

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藤 吾郎
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NAME

Text::Xslate::Manual::Builtin - Builtin methods and filters/functions in Xslate

DESCRIPTION

This document describes builtin methods and filters/functions in Xslate.

Note that the xslate engine is not aware of context, so all the methods and filters/functions return a single value, even when the equivalent of Perl's returns a list of values.

METHODS

The xslate engine supports auto-boxing, so you can call methods for primitive (non-object) values. The following is builtin methods.

For nil

nil has its specific namespace as nil, although no builtin methods are provided.

For SCALARs

The namespace of SCALARs is scalar, although no builtin methods are provided.

For ARRAY references

The namespace of ARRAY references is array.

Returns true;

$a.size()

Returns the number of elements of $a.

$a.join($separator)

Joins the elements of $a into a single string separated by $separator.

$a.reverse()

Returns an ARRAY reference consisting of the elements of $a in the opposite order.

$a.sort(?$callback)

Sorts $a and returns a new ARRAY reference. The optional $callback is the same as Perl's.

Examples:

    : my $a = [2, 1, 10];
    : # alphabetic sort (default)
    : $a.sort().join(" "); # 1 10, 2
    : # explicitly alphabetic
    : $a.sort(-> $a, $b { $a cmp $b }).join(" "); # 1, 10, 2
    : # numeric sort
    : $a.sort(-> $a, $b { $a <=> $b }).join(" "); # 1, 2, 10

See also "sort" in perlfunc.

$a.map($callback)

Evaluates $callback for each element of $a and returns a new ARRAY reference composed of the result of each such evaluation.

See also "map" in perlfunc

$a.reduce($callback)

Reduces $a by calling $callback multiple times. If $a is empty, this method returns nil.

Examples:

    : my $a = [10, 20, 30];
    : # sum
    : $a.reduce(-> $a, $b { $a + $b }); # 60
    : # concat
    : $a.reduce(-> $a, $b { $a ~ $b }); # 102030
    : # min
    : $a.reduce(-> $a, $b { $a min $b }); # 10
    : # max
    : $a.reduce(-> $a, $b { $a max $b }); # 30

See also "reduce" in List::Util.

For HASH references

The namespace of HASH references is hash.

$h.size()

Returns the number of entries of $h.

$h.keys()

Returns an ARRAY reference consisting of the keys of $h, which are sorted by the keys.

$h.values()

Returns an ARRAY reference consisting of the values of $h, which are sorted by the keys.

$h.kv()

Returns an ARRAY reference consisting of the key-value pairs of $h, which are sorted by the keys. Each pair is an object that has the keys and value attributes.

For example:

    : for $hash_ref.kv() -> $pair {
        <: $pair.key :>=<: $pair.value :>
    : }

FILTERS/FUNCTIONS

The xslate engine supports filter syntax as well as function call. The following is the builtin functions, which can be invoked as filter syntax. =head2 mark_raw($str)

Mark $str as a raw string to avoid auto HTML escaping.

raw is an alias to mark_raw.

unmark_raw($str)

Remove the raw mark from str. If str is not a raw string, this function returns str as is.

html($str)

Escapes html meta characters in str. If str is a raw string, this function returns str as is.

The html meta characters are /[<>"'&]/.

uri($str)

Escapes unsafe URI characters in $str.

The unsafe URI characters are characters not included in the unreserved character class defined by RFC 3986, i.e. /[^A-Za-z0-9\-\._~]/.

See also RFC 3986.

is_array_ref(($value)

Returns true if $value is an ARRAY reference.

is_hash_ref(($value)

Returns true if $value is a HASH reference.

dump($value)

Inspects $value with Data::Dumper.

This function is provided for testing and debugging.

SEE ALSO

Text::Xslate

Text::Xslate::Manual