Provided by: libtext-xslate-perl_3.5.6-1_amd64 
NAME
Text::Xslate::Syntax::TTerse - An alternative syntax compatible with Template Toolkit 2
SYNOPSIS
use Text::Xslate;
my $tx = Text::Xslate->new(
syntax => 'TTerse',
);
print $tx->render_string(
'Hello, [% dialect %] world!',
{ dialect => 'TTerse' }
);
# PRE_PROCESS/POST_PROCESS
$tx = Text::Xslate->new(
syntax => 'TTerse',
header => ['header.tt'],
footer => ['footer.tt'],
);
DESCRIPTION
TTerse is a subset of the Template-Toolkit 2 (and partially 3) syntax, using "[% ... %]"
tags and "%% ..." line code.
Note that TTerse itself has few methods and filters while Template-Toolkit 2 has a lot.
See "Text::Xslate::Bridge::*" modules on CPAN which provide extra methods and filters if
you want to use those features.
(TODO: I should concentrate on the difference between Template-Toolkit 2 and TTerse)
SYNTAX
This supports a Template-Toolkit compatible syntax, although the details might be
different.
Note that lower-cased keywords, which are inspired in Template-Toolkit 3, are also
allowed.
Variable access
Scalar access:
[% var %]
[% $var %]
[% GET var # 'GET' is optional %]
Field access:
[% var.0 %]
[% var.field %]
[% var.accessor %]
[% var.$field ]%
[% var[$field] # TTerse specific %]
Variables may be HASH references, ARRAY references, or objects.
If $var is an object instance, you can call its methods.
[% $var.method() %]
[% $var.method(1, 2, 3) %]
[% $var.method(foo => [1, 2, 3]) %]
[% $var.method({ foo => 'bar' }) %]
Expressions
Almost the same as Text::Xslate::Syntax::Kolon, but "infix:<_>" for concatenation is
supported for compatibility.
Loops
[% FOREACH item IN arrayref %]
* [% item %]
[% END %]
Loop iterators are partially supported.
[% FOREACH item IN arrayref %]
[%- IF loop.is_first -%]
<first>
[%- END -%]
* [% loop.index %] # 0 origin
* [% loop.count # loop.index + 1 %]
* [% loop.body # alias to arrayref %]
* [% loop.size # loop.body.size %]
* [% loop.max_index # loop.size - 1 %]
* [% loop.peek_next # loop.body[ loop.index + 1 ]
* [% loop.peek_prev # loop.body[ loop.index - 1 ]
[%- IF loop.is_last -%]
<last>
[%- END -%]
[% END %]
Unlike Template-Toolkit, "FOREACH" doesn't accept a HASH reference, so you must convert
HASH references to ARRAY references by "keys()", "values()", or "kv()" methods.
Template-Toolkit compatible names are also supported, but the use of them is discouraged
because they are not easy to understand:
loop.max # for loop.max_index
loop.next # for loop.peek_next
loop.prev # for loop.peek_prev
loop.first # for loop.is_first
loop.last # for loop.is_last
Loop control statements, namely "NEXT" and "LAST", are also supported in both "FOR" and
"WHILE" loops.
[% FOR item IN data -%]
[% LAST IF item == 42 -%]
...
[% END -%]
Conditional statements
[% IF logical_expression %]
Case 1
[% ELSIF logical_expression %]
Case 2
[% ELSE %]
Case 3
[% END %]
[% UNLESS logical_expression %]
Case 1
[% ELSE %]
Case 2
[% END %]
[% SWITCH expression %]
[% CASE case1 %]
Case 1
[% CASE case2 %]
Case 2
[% CASE DEFAULT %]
Case 3
[% END %]
Functions and filters
[% var | f %]
[% f(var) %]
Template inclusion
The "INCLUDE" statement is supported.
[% INCLUDE "file.tt" %]
[% INCLUDE $var %]
"WITH variables" syntax is also supported, although the "WITH" keyword is optional in
Template-Toolkit:
[% INCLUDE "file.tt" WITH foo = 42, bar = 3.14 %]
[% INCLUDE "file.tt" WITH
foo = 42
bar = 3.14
%]
The "WRAPPER" statement is also supported. The argument of "WRAPPER", however, must be
string literals, because templates will be statically linked while compiling.
[% WRAPPER "file.tt" %]
Hello, world!
[% END %]
%%# with variable
[% WRAPPER "file.tt" WITH title = "Foo!" %]
Hello, world!
[% END %]
The content will be set into "content", but you can specify its name with the "INTO"
keyword.
[% WRAPPER "foo.tt" INTO wrapped_content WITH title = "Foo!" %]
...
[% END %]
This is a syntactic sugar to template cascading. Here is a counterpart of the example in
Kolon.
: macro my_content -> {
Hello, world!
: }
: cascade "file.tx" { content => my_content() }
Note that the WRAPPER option
(<http://template-toolkit.org/docs/manual/Config.html#section_WRAPPER>) in Template-
Toolkit is not supported directly. Instead, you can emulate it with "header" and "footer"
options as follows:
my %vpath = (
wrap_begin => '[% WRAPPER "base" %]',
wrap_end => '[% END %]',
base => 'Hello, [% content %] world!' . "\n",
content => 'Xslate',
);
my $tx = Text::Xslate->new(
syntax => 'TTerse',
path => \%vpath,
header => ['wrap_begin'],
footer => ['wrap_end'],
);
print $tx->render('content'); # => Hello, Xslate world!;
Macro blocks
Definition:
[% MACRO foo BLOCK -%]
This is a macro.
[% END -%]
[% MACRO add(a, b) BLOCK -%]
[% a + b -%]
[% END -%]
Call:
[% foo() %]
[% add(1, 2) %]
Unlike Template-Toolkit, calling macros requires parens ("()").
Virtual methods
A few methods are supported in the Xslate core.
%% a.size();
%% a.join(", ");
%% a.reverse();
%% h.size();
%% h.keys();
%% h.values();
%% h.kv();
However, there is a bridge mechanism that allows you to use external methods. For
example, Text::Xslate::Bridge::TT2 provides the TT2 virtual methods for Xslate, which
bridges Template::VMethods implementation.
use Text::Xslate::Bridge::TT2;
my $tx = Text::Xslate->new(
syntax => 'TTerse',
module => [qw(Text::Xslate::Bridge::TT2)],
);
print $tx->render_string('[% "foo".length() %]'); # => 3
See Text::Xslate::Bridge, or search for "Text::Xslate::Bridge::*" on CPAN.
Misc.
CALL evaluates expressions, but does not print it.
[% CALL expr %]
SET and assignments, although the use of them are strongly discouraged.
[% SET var1 = expr1, var2 = expr2 %]
[% var = expr %]
DEFAULT statements as a syntactic sugar to "SET var = var // expr":
[% DEFAULT lang = "TTerse" %]
FILTER blocks to apply filters to text sections:
[% FILTER html -%]
Hello, <Xslate> world!
[% END -%]
COMPATIBILITY
There are some differences between TTerse and Template-Toolkit.
• "INCLUDE" of TTerse requires an expression for the file name, while that of Template-
Toolkit allows a bare token:
[% INCLUDE foo.tt # doesn't work! %]
[% INCLUDE "foo.tt" # OK %]
• "FOREACH item = list" is forbidden in TTerse. It must be "FOREACH item IN list".
• TTerse does not support plugins (i.e. "USE" directive), but understands the "USE"
keyword as an alias to "CALL", so you could use some simple plugins which do not
depend on the context object of Template-Toolkit.
use Template::Plugin::Math;
use Template::Plugin::String;
my $tt = Text::Xslate->new(...);
mt %vars = (
Math => Template::Plugin::Math->new(), # as a namespace
String => Template::Plugin::String->new(), # as a prototype
);
print $tt->render_string(<<'T', \%vars);
[% USE Math # does nothing actually, only for compatibility %]
[% USE String %]
[% Math.abs(-100) # => 100 %]
[% String.new("foo").upper # => FOO %]
• The following directives are not supported: "INSERT", "PROCESS", "BLOCK" as a named
blocks, "USE" (but see above), "PERL", "RAWPERL", "TRY", "THROW", "RETURN", "STOP",
"CLEAR", "META", "TAGS", "DEBUG", and "VIEW".
Some might be supported in a future.
SEE ALSO
Text::Xslate
Template (Template::Toolkit)
Template::Tiny
Text::Xslate::Bridge::TT2
Text::Xslate::Bridge::TT2Like
Text::Xslate::Bridge::Alloy