Provided by: libhtml-template-compiled-perl_1.001-1_all 
NAME
HTML::Template::Compiled - Template System Compiles HTML::Template files to Perl code
VERSION
$VERSION = "1.001"
SYNOPSIS
use HTML::Template::Compiled;
# recommended options:
# case_sensitive => 1
# search_path_on_include => 1
# use_query => 0
# default_escape => 'HTML' # <-- HIGHLY RECOMMENDED
# note that the following
# use HTML::Template::Compiled speed => 1
# is deprecated (can be problematic under persistent environments)
# or for the biggest compatibility with HTML::Template
# case_sensitive => 0
# search_path_on_include => 0
# use_query => 1
# note that the following
# use HTML::Template::Compiled compatible => 1;
# is deprecated (can be problematic under persistent environments)
# or use HTML::Template::Compiled::Classic
my $htc = HTML::Template::Compiled->new(
filename => 'test.tmpl',
case_sensitive => 1,
default_escape => 'HTML',
);
$htc->param(
BAND => $name,
ALBUMS => [
{ TITLE => $t1, YEAR => $y1 },
{ TITLE => $t2, YEAR => $y2 },
],
);
print $htc->output;
test.tmpl:
Band: <TMPL_VAR BAND>
<TMPL_LOOP ALBUMS>
Title: <TMPL_VAR TITLE> (<TMPL_VAR YEAR>)
</TMPL_LOOP>
Or use different tag styles:
Band: <%= BAND %>
<%loop ALBUMS %>
Title: <%= TITLE %> (<%= YEAR %>)
<%/loop %>
Band: [%= BAND %]
[%loop ALBUMS %]
Title: [%= TITLE %] ([%= YEAR %])
[%/loop %]
DESCRIPTION
HTML::Template::Compiled is a template system which can be used for HTML::Template
templates with almost the same API. It offers more flexible template delimiters,
additional tags and features, and by compiling the template into perl code it can run
significantly faster in persistent environments such as FastCGI or mod_perl.
The goal is to offer more features for flexibility but keep the basic syntax as easy as it
is.
Features at a glance:
Dot notation for objects, hashes and arrays
Use expressions without any disadvantages like those in HTML::Template::Expr
Write escaping plugins and plugins for new tags
Alternate delimiters, e.g. "[%if %]" and "<%if %>"
Avoid "global_vars" option by using the "SET_VAR" tag to create aliases.
Tags ELSIF, EACH, WHILE, COMMENT, WRAPPER, SWITCH/CASE, INCLUDE_VAR
Chomp newlines/whitespace
For a quick reference, see HTML::Template::Compiled::Reference.
As the basic features work like in HTML::Template, please get familiar with its
documentation before.
HTML::Template::Compiled (HTC) does not implement all features of HTML::Template (see
"COMPATIBILITY"), and it has got some additional features which are explained below:
"ADDITIONAL FEATURES"
See "BENCHMARKS" for some examples on the performance. Since it depends highly on the
options used and on the template size there can be no general statement on its
performance.
You might want to use HTML::Template::Compiled::Lazy for CGI environments as it doesn't
parse the template before calling output. But note that HTC::Lazy isn't much tested, and I
don't use it myself, so there's a lack of experience. If you use it and have problems,
please report.
HTC will use a lot of memory because it keeps all template objects in memory. If you are
on mod_perl, and have a lot of templates, you should preload them at server startup to be
sure that it is in shared memory. At the moment HTC is not fully tested for keeping all
data in shared memory (e.g. when a copy-on-write occurs), but it seems like it's behaving
well. For preloading you can use
HTML::Template::Compiled->preload($cache_dir).
Generating code, writing it on disk and later eval() it can open security holes, for
example if you have more users on the same machine that can access the same files (usually
an http server running as 'www' or 'nobody'). See "SECURITY" for details what you can do
to safe yourself.
NOTE: If you don't need any of the additional features listed below and if you don't need
the speed (in many cases it's probably not worth trading speed for memory), then you might
be better off with just using HTML::Template.
NOTE2: If you have any questions, bug reports, send them to me and not to Sam Tregar.
This module is developed by me at the moment, independently from HTML::Template, although
I try to get most of the tests from it passing for HTC. See "RESOURCES" for current
information.
FEATURES FROM HTML::TEMPLATE
TMPL_VAR
TMPL_LOOP
TMPL_(IF|UNLESS|ELSE)
TMPL_INCLUDE
HTML_TEMPLATE_ROOT
ESCAPE=(HTML|URL|JS|0)
DEFAULT=...
"__first__", "__last__", "__inner__", "__outer__", "__odd__", "__counter__", "__even__"
<!-- TMPL_VAR NAME=PARAM1 -->
case insensitive var names
use option case_sensitive => 0 to use this feature (slow down)
filters
vars that are subrefs - not implemented, only in HTML::Template::Compiled::Classic
scalarref, arrayref, filehandle
"global_vars"
"query"
Has a bug (doesn't return parameters in included files of included files). I'm
working on that.
ADDITIONAL FEATURES
What can HTC do for you additionally to HTML::Template?
tag TMPL_ELSIF
No need to have cascading "if-else-if-else"s
tag TMPL_EACH
Iterate over a hash. See "TMPL_EACH"
tag TMPL_WITH
see "TMPL_WITH"
tag TMPL_WHILE
see "TMPL_WHILE"
tag TMPL_SET_VAR
see "SET_VAR"
tag TMPL_USE_VARS
see "USE_VARS"
tags TMPL_COMMENT, TMPL_NOPARSE, TMPL_VERBATIM
see "TMPL_COMMENT", "TMPL_NOPARSE", "TMPL_VERBATIM"
tag TMPL_WRAPPER
see "WRAPPER"
"__index__"
Additional loop variable ("__counter__ -1")
"__break__"
Additional loop variable (see "TMPL_LOOP")
"__filename__", "__filenameshort__" (since 0.91_001)
Insert the template filename for debugging:
<%= __filename__ %>
<%= __filenameshort__ %>
will turn out as:
templates/path/file.html
path/file.html
See also option debug_file in "OPTIONS" for adding the filename globally.
tags TMPL_SWITCH, TMPL_CASE
see "TMPL_SWITCH"
"TMPL_PERL"
Include perl code in your template. See "RUNNING PERL WITH TMPL_PERL"
CHOMP
New in version 0.96_001, please report any bugs and send me suggestions.
You can set global chomp options in the constructor. These work like in Template-
Toolkit:
my $htc = HTML::Template::Compiled->new(
pre_chomp => 0, # 0, 1, 2, 3, default 0
post_chomp => 1, # 0, 1, 2, 3, default 0
);
Meaning of the values: 0: Don't chomp 1: remove only spaces in the line before or
after the tag 2: remove all whitespaces before or after the tag, and replace with one
space 3: remove all whitespaces before or after the tag
In the template you can change that feature by using PRE_CHOMP and POST_CHOMP
attributes:
<%= foo PRE_CHOMP=3 POST_CHOMP=1 %>
The experimental tags +..._chomp have been removed.
Generating perl code
See "IMPLEMENTATION"
better variable access
dot-notation for accessing hash values. See "EXTENDED VARIABLE ACCESS"
rendering objects
dot-notation for accessing object methods. See "RENDERING OBJECTS"
output to filehandle
See "OPTIONS"
Dynamic includes
"INCLUDE_VAR", "INCLUDE_STRING". See "INCLUDE"
tag TMPL_IF_DEFINED
Check for definedness instead of truth:
<TMPL_IF_DEFINED NAME="var">
ALIAS
Set an alias for a loop variable. You can use the alias then with $alias. The syntax
without the "$" is also possible but not recommended any more.
For example, these two loops are functionally equivalent:
<tmpl_loop foo>
<tmpl_var _>
</tmpl_loop foo>
<tmpl_loop foo alias=current>
<tmpl_var $current>
</tmpl_loop foo>
This works with "TMPL_LOOP" and "TMPL_WHILE" at the moment.
You can also set aliases with the "SET_VAR" tag. See "SET_VAR"
To use template parameters with a "$" at the beginning (which is not officially
supported, but some are obviously using it), you can set:
local $HTML::Template::Compiled::Compiler::DISABLE_NEW_ALIAS = 1;
This is only a temporary workaround and will be removed some day!
Note that you are also able to access variables with dollar signs like this:
<tmpl_var _.$foo >
since underscore means current position in the parameter stash, and aliases are only
recognized at the beginning of a template var. But note that dollar signs are still
not officially supported.
Chained escaping
See "ESCAPING"
tagstyles
For those who like it (i like it because it is shorter than TMPL_), you can use <% %>
tags and the <%= tag instead of <%VAR (which will work, too):
<%IF blah%> <%= VARIABLE%> <%/IF%>
Define your own tagstyles and/or deactivate predefined ones. See "OPTIONS" tagstyle.
pre_chomp, post_chomp
See "CHOMP"
MISSING AND DIFFERENT FEATURES
There are some features of H::T that are missing or behaving different. I'll try to list
them here.
MISSING FEATURES
die_on_bad_params
I don't think I'll implement that.
force_untaint
Not planned at the moment
vanguard_compatibility_mode
Not planned.
shared_cache, double_cache
Not planned at the moment
blind_cache
Not sure if I should implement. In HTC you have the possibility to set the expire time
of the templates (after that time in memory the template file is rechecked if it has
changed), so setting a very high value for expire_time would have the same effect as
blind_cache. See "CACHING" "expire_time"
double_file_cache
If I understand correctly, in HT, this enables memory and file cache at the same time.
In HTC, this is not needed. If you use file_cache and cache, both are used.
file_cache_dir_mode
Not planned. The cache dir must exist, and subdirectories are not created at the
moment.
cache_lazy_vars, cache_lazy_loops
Not planned at the moment (This would be for HTML::Template::Compiled::Classic, since
it implements code refs).
utf8
Might be added in the future, HTC already has "open_mode"
various debug options
Might be implemented in the future
associate
Not planned.
max_includes
Not planned
die_on_missing_include
Maybe
DIFFERENT FEATURES
case_sensitive
default is 1 (on).
Deactivate by passing option case_sensitive 0.
Note (again): this will slow down templating a lot (50%).
Explanation: This has nothing to do with "TMPL_IF" or "tmpl_if". It's about the
variable names. With case_sensitive set to 1, the following tags are different:
<tmpl_var Foo> prints the value of hash key 'Foo'
<tmpl_var fOO> prints the value of hash key 'fOO'
With case_sensitive set to 0, all your parameters passed to "param()" are converted to
lowercase, and the following tags are the same:
<tmpl_var Foo> prints the value of hash key 'foo'
<tmpl_var fOO> prints the value of hash key 'foo'
subref variables
As of version 0.69, subref variables are not supported any more with
HTML::Template::Compiled. Use HTML::Template::Compiled::Classic (contained in this
distribution) instead. It provides most features of HTC.
search_path_on_include
Default: 0
In the HTML::Template documentation it says, if search_path_on_include is set to 1,
the paths of the path option are searched, while the default behaviour is to look
"only" in the current template directory.
It's not clear if it still searches in the current directory if set to 1. I found out
that it is not, so you cannot have both.
In HTML::Template::Compiled, search_path_on_include can have three values:
0: search current template directory
1: search paths specified
2: search paths and current template directory.
open_mode
In HTC you should leave out the "<" at the beginning.
If you want to have your templates read in utf-8, use
open_mode => ':encoding(utf-8)',
as an option.
use_query
default is 0 (off). Set it via the option "use_query"
Arrayrefs
At the moment this snippet
<tmpl_if arrayref>true<tmpl_else>false</tmpl_if arrayref>
with this code:
$htc->param(arrayref => []);
will print true in HTC and false in HTML::Template. In HTML::Template an array is true
if it has content, in HTC it's true if it (the reference) is defined. I'll try to find
a way to change that behaviour, though that might be for the cost of speed.
As of HTML::Template::Compiled 0.85 you can use this syntax:
<tmpl_if arrayref# >true<tmpl_else>false</tmpl_if >
In HTML::Template::Compiled::Classic 0.04 it works as in HTML::Template.
debug_cache
Additional to 0 or 1 it can take an array ref for debugging only specific cache
operations.
Note: the following is deprecated:
To be compatible in all of the above options all use:
use HTML::Template::Compiled compatible => 1;
If you don't care about these options you should use
use HTML::Template::Compiled speed => 1;
which is the default but depending on user wishes that might change.
DEPRECATED
class methods ExpireTime, EnableSub, CaseSensitive, SearchPathOnInclude, UseQuery
option formatter_path
tag USE_VARS, not needed anymore
option cache_dir (replaced by file_cache_dir)
options method_call, deref, default_path, dumper
import tags short, compatible, speed
ESCAPING
Like in HTML::Template, you have "ESCAPE=HTML", "ESCAPE=URL" and "ESCAPE_JS".
"ESCAPE=HTML" will only escape '"&<>. If you want to escape more, use "ESCAPE=HTML_ALL".
Additionally you have "ESCAPE=DUMP", which by default will generate a Data::Dumper output.
You can also chain different escapings, like "ESCAPE=DUMP|HTML".
Additionally to ESCAPE=JS you have ESCAPE=IJSON which does not escape the single quote.
INCLUDE
Additionally to
<TMPL_INCLUDE NAME="file.htc">
you can do an include of a template variable:
<TMPL_INCLUDE_VAR NAME="file_include_var">
$htc->param(file_include_var => "file.htc");
Using "INCLUDE VAR="..."" is deprecated.
You can also include strings:
template:
inc: <%include_string foo %>
code:
$htc->param(
foo => 'included=<%= bar%>',
bar => 'real',
);
output:
inc: included=real
Note that included strings are not cached and cannot include files or strings themselves.
EXTENDED VARIABLE ACCESS
With HTC, you have more control over how you access your template parameters. An example:
my %hash = (
SELF => '/path/to/script.pl',
LANGUAGE => 'de',
BAND => 'Bauhaus',
ALBUMS => [
{
NAME => 'Mask',
SONGS => [ { NAME => 'Hair of the Dog' }, ... ],
},
],
INFO => {
BIOGRAPHY => '...',
LINK => '...'
},
NAME => "Cool script",
);
Now in the TMPL_LOOP "ALBUMS" you would like to access the path to your script, stored in
$hash{SELF}. in HTML::Template you have to set the option "global_vars", so you can access
$hash{SELF} from everywhere. Unfortunately, now "NAME" is also global, which might not a
problem in this simple example, but in a more complicated template this is impossible.
With HTC, you wouldn't use "global_vars" here, but you can say:
<TMPL_VAR .SELF>
to access the root element, and you could even say ".INFO.BIOGRAPHY" or
"ALBUMS[0].SONGS[0].NAME" (the latter has changed since version 0.79)
RENDERING OBJECTS
This is still in development, so I might change the API here.
Additionally to feeding a simple hash to HTC, you can feed it objects. To do method calls
you can also use '.' in the template.
my $htc = HTML::Template::Compiled->new(
...
);
$htc->param(
VAR => "blah",
OBJECT => bless({...}, "Your::Class"),
);
<TMPL_VAR NAME="OBJECT.fullname">
<TMPL_WITH OBJECT>
Name: <TMPL_VAR fullname>
</TMPL_WITH>
"fullname" will call the fullname method of your Your::Class object.
It's recommended to just use the default . value for methods and dereferencing.
I might stop supporting that you can set the values for method calls by setting an option.
Ideally I would like to have that behaviour changed only by inheriting.
RUNNING PERL WITH TMPL_PERL
Yes, templating systems are for separating code and templates. But as it turned out to be
implemented much easier than expressions i decided to implement it. But expressions are
also available with the option "use_expressions".
Note: If you have templates that can be edited by untrustworthy persons then you don't
want them to include perl code.
So, how do you use the perl-tag? First, you have to set the option "use_perl" to 1 when
creating a template object.
Important note: don't use "print" in the included code. Usually the template code is
concatenated and returned to your perl script. To 'print' something out use
__OUT__ 2**3;
This will be turned into something like
$OUT .= 2**3;
# or
print $fh 2**3;
Important note 2: HTC does not parse Perl. if you use the classic tag-delimiters like
this:
<tmpl_perl if (__CURRENT__->count > 42) { >
this will not work as it might seem. Use other delimiters instead:
<%perl if (__CURRENT__->count > 42) { %>
Example:
<tmpl_loop list>
<tmpl_perl unless (__INDEX__ % 3) { >
</tr><tr>
<tmpl_perl } >
</tmpl_loop list>
# takes the current position of the parameter
# hash, key 'foo' and multiplies it with 3
<%perl __OUT__ __CURRENT__->{foo} * 3; %>
List of special keywords inside a perl-tag:
__OUT__
Is turned into "$OUT .=" or "print $fh"
__HTC__
Is turned into the variable containing the current template object.
__CURRENT__
Turned into the variable containing the current position in the parameter hash.
__ROOT__
Turned into the variable containig the parameter hash.
__INDEX__
Turned into the current index of a loop (starting with 0).
INHERITANCE
It's possible since version 0.69 to inherit from HTML::Template::Compiled. It's just not
documented, and internal method names might change in the near future. I'll try to fix the
API and document which methods you can inherit.
METHODS TO INHERIT
method_call
Default is "sub method_call { '.' }"
deref
Default is "sub deref { '.' }"
formatter_path
Deprecated, see HTML::Template::Compiled::Formatter please.
compile_early
Define if every included file should be checked and parsed at compile time of the
including template or later when it is really used.
Default is "sub compile_early { 1 }"
parser_class
Default is "sub parser_class { 'HTML::Template::Compiled::Parser' }"
You can write your own parser class (which must inherit from
HTML::Template::Compiled::Parser) and use this.
HTML::Template::Compiled::Lazy uses this.
DEBUGGING
For printing out the contents of all the parameters you can do:
<TMPL_LOOP ALBUMS>
Dump: <TMPL_VAR _ ESCAPE=DUMP|HTML>
</TMPL_LOOP>
The special name "_" gives you the current parameter and "ESCAPE=DUMP" will by default
generate a Data::Dumper output of the current variable, in this case it will dump out the
contents of every album in a loop. To correctly display that in html "|HTML" will escape
html entities.
TMPL_WITH
If you have a deep leveled hash you might not want to always write
THE.FULL.PATH.TO.YOUR.VAR. Jump to your desired level once and then you need only one
level. Compare:
<TMPL_WITH DEEP.PATH.TO.HASH>
<TMPL_VAR NAME>: <TMPL_VAR AGE>
</TMPL_WITH>
<TMPL_VAR DEEP.PATH.TO.HASH.NAME>: <TMPL_VAR DEEP.PATH.TO.HASH.AGE>
Inside TMPL_WITH you can't reference parent nodes unless you're using global_vars.
TMPL_LOOP
The special name "_" gives you the current parameter. In loops you can use it like this:
<tmpl_loop foo>
Current item: <tmpl_var _ >
</tmpl_loop>
Also you can give the current item an alias. See "ALIAS".
The LOOP tag allows you to define a JOIN attribute:
<tmpl_loop favourite_colors join=", ">
<tmpl_var _ >
</tmpl_loop>
This will output something like "blue, pink, yellow". This is easier than doing:
<tmpl_loop favourite_colors>
<tmpl_unless __first__>, </tmpl_unless>
<tmpl_var _ >
</tmpl_loop>
The "LOOP", "WHILE" and "EACH" tags allow you to define a BREAK attribute:
<tmpl_loop bingo break="3"> <tmpl_var _ ><if __break__>\n</if></tmpl_loop>
$htc->param(bingo => [qw(X 0 _ _ X 0 _ _ X)]);
outputs
X 0 _
_ X 0
_ _ X
So specifying BREAK=3 sets __break__ to 1 every 3rd loop iteration.
TMPL_LOOP expects an array reference, also if it is a method call. If you want to iterate
with TMPL_LOOP over a list from a method call, set the attribute "context=list":
<tmpl_loop object.list_method context=list>
<tmpl_var _ >
</tmpl_loop>
TMPL_WHILE
Useful for iterating, for example over database resultsets. The directive
<tmpl_while resultset.fetchrow>
<tmpl_var _.0>
</tmpl_while>
will work like:
while (my $row = $resultset->fetchrow) {
print $row->[0];
}
So the special variable name _ is set to the current item returned by the iterator.
You also can use "ALIAS" here.
TMPL_EACH
Iterating over a hash. Internally it is not implemented as an each, so you can also sort
the output:
Sorted alphanumerically by default (since 0.93):
<tmpl_each letters >
<tmpl_var __key__ >:<tmpl_var __value__>
</tmpl_each letters >
Sorted numerically:
<tmpl_each numbers sort=num >
<tmpl_var __key__ >:<tmpl_var __value__>
</tmpl_each numbers >
Not sorted:
<tmpl_each numbers sort=0 >
<tmpl_var __key__ >:<tmpl_var __value__>
</tmpl_each numbers >
Sorted alphanumerically:
<tmpl_each letters sort=alpha >
<tmpl_var __key__ >:<tmpl_var __value__>
</tmpl_each letters >
You have to set the option "loop_context_vars" to true to use the special vars "__key__"
and "__value__".
If you want to iterate over a hash instead of a hashref (some methods might return plain
hashes instead of references and TMPL_EACH expects a ref), then you can set
"context=list":
<tmpl_each object.hash_method context=list>
<tmpl_var __key__ >
</tmpl_each>
Since 1.000_001 you can also define by which variable you want to sort. If you have a
hash with hashes as values:
$htc->param(
letters => {
1 => { letter =>'b' },
2 => { letter =>'a' },
3 => { letter =>'c' },
},
);
<%each letters sort=alpha sortby="letter" %>
<%set_var val value=__value__ %>
<%= __key__ %> = <%= $val.letter %>
<%/each%>
SET_VAR
Since 0.96_002
Sets a local variable to the value given in "value" or "expr"
<tmpl_set foo expr=23>
<tmpl_set name=bar expr=23>
<tmpl_set boo value=var.boo>
<tmpl_set oof expr="21*2">
<tmpl_var $foo>
<tmpl_var $bar>
...
"value=.." behaves like a variable name from the parameter stash. The variable name to
set must match /[0-9a-z_]+/i
You can refer to an alias via $alias or simply "alias". Note that the latter syntax is not
recommeded any more since it can conflict with parameters from the stash.
If you want to use aliases in includes, you need to use the $alias syntax.
USE_VARS
deprecated. Was added in 0.96_004 to make it possible to use aliases set with "alias=..."
or "SET_VAR" in includes. Now you should rather use the <$alias> syntax.
The following explanation is just there for history and will be removed some time in the
future. For now it still works.
Necessary if you want vars like SET_VAR and loop aliases from outside in includes. Before
the first use in the include, add:
<tmpl_use_vars foo,bar,boo >
so that the compiler recognizes them as user defined vars and not parameters from the
stash. This statement is valid until the end of the template so you cannot "overwrite"
parameters of the stash locally.
WRAPPER
Since 0.97_005. Experimental. Please test.
Needs option "loop_context_vars".
Works similar to WRAPPER in Template-Toolkit.
Is similar to TMPL_INCLUDE, just that the included wrapper is wrapped around the content.
It can be used to avoid including head and foot separately.
<tmpl_wrapper wrapper.html >
content: some var: <tmpl_var foo >
</tmpl_wrapper>
In wrapper.html the special loop context var "__wrapper__" is used for the included
content:
wrapper.html:
<some><layout>
<tmpl_var __wrapped__ >
</layout></some>
Important notes:
If you are using "out_fh" to print directly to a filehandle instead of returning to a
string, this feature might not be useful, since it is appending the content inside of the
wrapper to a string and prints it when it comes to the end of the wrapper tag. So if you
are using "out_fh" to avoid generating long strings in memory, you should rather use
TMPL_INCLUDE instead.
Also you need perl 5.8 or higher to use it in combination with out_fh.
TMPL_COMMENT
For debugging purposes you can temporarily comment out regions:
Wanted: <tmpl_var wanted>
<tmpl_comment outer>
this won't be printed
<tmpl_comment inner>
<tmpl_var unwanted>
</tmpl_comment inner>
<tmpl_var unwanted>
</tmpl_comment outer>
$htc->param(unwanted => "no thanks", wanted => "we want this");
The output is (whitespaces stripped):
Wanted: we want this
HTC will ignore anything between COMMENT directives. This is useful for debugging, and
also for documentation inside the template which should not be outputted.
TMPL_NOPARSE
Anything between
<tmpl_noparse>...</tmpl_noparse>
will not be recognized as template directives. Same syntax as TMPL_COMMENT. It will
output the content, though.
TMPL_VERBATIM
Anything between
<tmpl_verbatim>...</tmpl_verbatim>
will not be recognized as template directives. Same syntax as "TMPL_NOPARSE", but it will
be HTML-Escaped. This can be useful for debugging.
TMPL_SWITCH
The SWITCH directive has the same syntax as VAR, IF etc. The CASE directive takes a
simple string or a comma separated list of strings. Yes, without quotes. This will
probably change! I just don't know yet how it should look like. Suggestions?
With that directive you can do simple string comparisons.
<tmpl_switch language>(or <tmpl_switch name=language>)
<tmpl_case de>echt cool
<tmpl_case en>very cool
<tmpl_case es>superculo
<tmpl_case fr,se>don't speak french or swedish
<tmpl_case default>sorry, no translation for cool in language <%=language%> available
<tmpl_case>(same as default)
</tmpl_switch>
It's also possible to specify the default with a list of other strings:
<tmpl_case fr,default>
Note that the default case should always be the last statement before the closing switch.
OPTIONS
As you can cache the generated perl code in files, some of the options are fixed; that
means for example if you set the option case_sensitive to 0 and the next time you call the
same template with case_sensitive 1 then this will be ignored. The options below will be
marked as (fixed).
path
Path to template files
search_path_on_include
Search the list of paths specified with "path" when including a template. Default is
0
See "DIFFERENT FEATURES" for the additional possible value 2.
file_cache
Set to 1 if you want to use file caching and specify the path with file_cache_dir.
file_cache_dir
Path to caching directory (you have to create it before)
cache_dir
Replaced by file_cache_dir like in HTML::Template. Will be deprecated in future
versions.
cache
Is 1 by default. If set to 0, no memory cacheing is done. Only recommendable if you
have a dynamic template content (with scalarref, arrayre for example).
expire_time
Recheck template files on disk after "expire_time" seconds. See "CACHING"
filename
Template to parse
scalarref
Reference to a scalar with your template content. It's possible to cache scalarrefs,
too, if you have Digest::MD5 installed. Note that your cache directory might get
filled with files from earlier versions. Clean the cache regularly.
Don't cache scalarrefs if you have dynamic strings. Your memory might get filled up
fast! Use the option
cache => 0
to disable memory caching.
arrayref
Reference to array containing lines of the template content (newlines have to be
included)
filehandle
Filehandle which contains the template content. Note that HTC will not cache templates
created like this.
loop_context_vars (fixed)
Vars like "__first__", "__last__", "__inner__", "__odd__", "__counter__", "__index__",
"__outer__", "__even__"
The variable "__index__" works just like "__counter__", only that it starts at 0
instead of 1.
global_vars (fixed)
If set to 1, every outer variable can be accessed from anywhere in the enclosing
scope.
Default is 0.
Note that I don't recommend using global_vars. For referring to parameters up in the
stash you can use aliases via "alias=..." or "SET_VAR". See "ALIAS" and "SET_VAR".
If yoy still would like to be able to navigate up the parameter stash, you have the
following option:
If set to 2, you don't have global vars, but have the possibility to go up the stack
one level. Example:
<tmpl_var ...key>
This will get you up 2 levels (remember: one dot means root in HTC) and access the
'key' element.
If set to 3 ("3 == 1|2") you have both, global vars and explicitly going up the stack.
So setting global_vars to 2 can save you from global vars but still allows you to
browse through the stack.
default_escape
my $htc = HTML::Template::Compiled->new(
...
default_escape => 'HTML', # or URL
);
Now everything will be escaped for HTML unless you explicitly specify "ESCAPE=0" (no
escaping) or "ESCAPE=URL".
strict (since 0.97_001)
Default: 1
If set to 0 unknown tags will be ignored and output verbatim:
<TMPL_FOOBAR anything ... <TMPL_VAR valid>
line_info (fixed) (since 1.000_004)
Default: 0
my $htc = HTML::Template::Compiled->new(
...
line_info => 1, # default 0
);
If any runtime errors occur, line information will output the template filename and
line (instead of "eval" and the generated perl code line)
warnings (fixed) (since 1.000_004)
Default: 0
If set to 1, runtime warnings (like use of uninitialized value) will be output to
stderr.
If set to 'fatal', any runtime warning will cause the script to die.
no_includes (since 0.92)
Default is 0. If set to 1, the tags INCLUDE, INCLUDE_VAR and INCLUDE_STRING will cause
a template syntax error when creating. This can be useful when opening untrusted
templates, otherwise any file in the filesystem could be opened.
debug_file (fixed) (since 0.91_001)
Additionally to the context_vars __filename__ and __filenameshort__ you can enable
filename debugging globally.
If the option is set to 'start', at the start of every template will be added:
<!-- start templates/path/filename.html -->
If set to 'end', at the end will be added:
<!-- end templates/path/filename.html -->
If set to 'start,end', both coments will be added.
If set to 'start,short', 'end,short' or 'start,end,short' the path to the templates
will be stripped:
<!-- start path/filename.html -->
<!-- end path/filename.html -->
objects (fixed) (since 0.91_001)
if set to true, you can use method calls like
<%= object.method %>
Default is 'strict' (true). If set to 'strict', the method will be called if we have
an object, otherwise it's treated as a hash lookup. If the method doesn't exist, it
dies. If set to 'nostrict', the method will be called only if the object 'can' do the
method, otherwise it will return undef (this will need Scalar::Util). If set to 0, no
method calls are allowed.
deref (fixed)
Deprecated. Please inherit and overwrite method 'deref'. See "INHERITANCE"
Define the string you want to use for dereferencing, default is "." at the moment:
<TMPL_VAR hash.key>
method_call (fixed)
Deprecated. Please inherit and overwrite method 'method_call'. See "INHERITANCE"
Define the string you want to use for method calls, default is . at the moment:
<TMPL_VAR object.method>
Don't use ->, though, like you could in earlier version. Var names can contain:
Numbers, letters, '.', '/', '+', '-' and '_', just like HTML::Template. Note that if
your var names contain dots, though, they will be treated as hash dereferences. If you
want literal dots, use HTML::Template::Compiled::Classic instead.
default_path (fixed)
Deprecated, see HTML::Template::Compiled::Formatter please.
my $htc = HTML::Template::Compiled->new(
...
default_path
# default is PATH_DEREF
=> HTML::Template::Compiled::Utils::PATH_FORMATTER,
);
Is needed if you have an unqualified tmpl_var that should be resolved as a call to
your formatter, for example. Otherwise you have to call it fully qualified. If your
formatter_path is '/', you'd say tmpl_var "_/method". With the option default_path
you can make that the default, so you don't need the "_/": "tmpl_var method". If you
don't use formatters, don't care about this option.
line_numbers
NOTE: This option does not exist any more; line numbers will alway be reported.
For debugging: prints the line number of the wrong tag, e.g. if you have a /TMPL_IF
that does not have an opening tag.
case_sensitive (fixed)
default is 1, set it to 0 to use this feature like in HTML::Template. Note that this
can slow down your program a lot (50%).
dumper
This option is deprecated as of version 0.76. You must now use a plugin instead, like
HTML::Template::Compiled::Plugin::DHTML, for examle.
my $t = HTML::Template::Compiled->new(
...
dumper = sub { my_cool_dumper($_[0]) },
);
---
<TMPL_VAR var ESCAPE=DUMP>
This will call "my_cool_dumper()" on "var".
Alternatively you can use the DHTML plugin which is using "Data::TreeDumper" and
"Data::TreeDumper::Renderer::DHTML". You'll get a dumper like output which you can
collapse and expand, for example. See Data::TreeDumper and
Data::TreeDumper::Renderer::DHTML for more information. Example:
my $t = HTML::Template::Compiled->new(
...
dumper = 'DHTML',
);
For an example see "examples/dhtml.html".
out_fh (fixed)
my $t = HTML::Template::Compiled->new(
...
out_fh => 1,
);
...
$t->output($fh); # or output(\*STDOUT) or even output()
This option is fixed, so if you create a template with "out_fh", every output of this
template will print to a specified (or default "STDOUT") filehandle.
filter
Filter template code before parsing.
my $t = HTML::Template::Compiled->new(
...
filter => sub { myfilter( ${$_[0]} ) },
# or
filter => [ {
sub => sub { myfilter( ${$_[0]} ) },
format => 'scalar', # or array
},
...
],
);
tagstyle (fixed)
Specify which styles you want to use. This option takes an arrayref with strings of
named tagstyles or your own regexes.
At the moment there are the following named tagstyles builtin:
# classic (active by default)
<TMPL_IF foo><tmpl_var bar></TMPL_IF>
# comment (active by default)
<!-- TMPL_IF foo --><!-- TMPL_VAR bar --><!-- /TMPL_IF -->
# asp (active by default)
<%if foo%><%VAR bar%><%/if%>
# php (not active by default)
<?if foo?><?var bar?><?/if foo?>
# tt (not active by default)
[%if foo%][%var bar%][%/if foo%]
You deactive a style by saying -stylename. You activate by saying +stylename.
Define your own tagstyle by specifyin regexes. For example you want to use {"{if
foo}}{{var bar}}{{/if foo}}", then your definition should be:
[
qr({{), # start of opening tag
qr(}}), # end of opening tag
qr({{/), # start of closing tag
qr(}}), # end of closing tag
]
NOTE: do not specify capturing parentheses in you regexes. If you need parentheses,
use "(?:foo|bar)" instead of "(foo|bar)".
Say you want to deactivate asp-style, comment-style, activate php- and tt-style and
your own "{{}} " style, then say:
my $htc = HTML::Template::Compiled->new(
...
tagstyle => [
qw(-asp -comment +php +tt),
[ qr({{), qr(}}), qr({{/), qr(}})],
],
);
use_expressions (since 0.91_003)
Set to 1 if you want to use expressions. The basic expressions work more or less like
in HTML::Template::Expr - I took the parsing code from it and used it with some minor
changes - thanks to Sam Tregar.
<%if expr="some.var > 3" %>It's grater than 3<%/if %>
But with expressions you can also use more complex navigation through the template
stash:
You can use object methods with parameters. While a normal method call can only be
called without parameters, like
<%= object.name %>
with expressions you can give it parameters:
<%= expr="object.create_link('navi')" %>
Inside function and method calls, hash keys you also can use template vars (array
indices and hash keys since 0.96_003).
<%= expr=".path.to.hash{var}" %>
<%= expr=".path.to.hash{.another.var[123]}{'literal key'}" %>
It is only minimally tested yet, so use with care and please report any bugs you find.
A useful example: Output a number of items with their prices formatted.
my $nf = Number::Format->new(...);
my $htc = HTML::Template::Compiled->new(
filename => 'items.html',
use_expressions => 1,
);
$htc->param(
items => [
{ size => 50 * 1024 * 1024 * 1024, price => 49.95 },
{ size => 250 * 1024 * 1024 * 1024, price => 110.99 },
],
nf => $nf,
);
items.html:
<%loop .items %>
Size: <%= expr=".nf.format_bytes(size)" %>
Price: <%= expr=".nf.format_price(price)" %>
<%/loop %>
Output:
Size: 50G
Price: 49,95 EUR
Size: 250G
Price: 110,99 EUR
formatter
Deprecated, see HTML::Template::Compiled::Formatter please.
With formatter you can specify how an object should be rendered. This is useful if you
don't want object methods to be called, but only a given subset of methods.
my $htc = HTML::Template::Compiled->new(
...
formatter => {
'Your::Class' => {
fullname => sub {
$_[0]->first . ' ' . $_[0]->last
},
first => Your::Class->can('first'),
last => Your::Class->can('last'),
},
},
);
# $obj is a Your::Class object
$htc->param(obj => $obj);
# Template:
# Fullname: <tmpl_var obj/fullname>
formatter_path (fixed)
Deprecated, see HTML::Template::Compiled::Formatter please.
debug
If set to 1 you will get the generated perl code on standard error
use_query
Set it to 1 if you plan to use the query() method. Default is 0.
Explanation: If you want to use query() to collect information on the template HTC has
to do extra-work while compiling and uses extra-memory, so you can choose to save HTC
work by setting use_query to 0 (default) or letting HTC do the extra work by setting
it to 1. If you would like 1 to be the default, write me. If enough people write me,
I'll think abou it =)
use_perl
Set to 1 if you want to use the perl-tag. See "TMPL_PERL". Default is 0.
cache_debug
Default: 0
You can debug hits and misses for file cache and memory cache:
# debug all cache
my $htc = HTML::Template::Compiled->new(
cache_debug => 1,
...
);
# only debug misses
my $htc = HTML::Template::Compiled->new(
cache_debug => [qw/ file_miss mem_miss /],
...
);
Possible values when passing an array ref: file_miss file_hit mem_miss mem_hit
Output looks similar to HTML::Template cache_debug and will be output to STDERR via
warn().
METHODS
clear_cache ([DIR])
Class method. It will clear the memory cache either of a specified cache directory:
HTML::Template::Compiled->clear_cache($cache_dir);
or all memory caches:
HTML::Template::Compiled->clear_cache();
clear_filecache
Class- or object-method. Removes all generated perl files from a given directory.
# clear a directory
HTML::Template::Compiled->clear_filecache('cache_directory');
# clear this template's cache directory (and not one template file only!)
$htc->clear_filecache();
param
Works like in HTML::Template.
query
Works like in HTML::Template. But it is not activated by default. If you want to use
it, specify the use_query option.
preload
Class method. Will preload all template files from a given cachedir into memory.
Should be done, for example in a mod_perl environment, at server startup, so all
templates go into "shared memory"
HTML::Template::Compiled->preload($cache_dir);
If you don't do preloading in mod_perl, memory usage might go up if you have a lot of
templates.
Note: the directory is *not* the template directory. It should be the directory which
you give as the file_cache_dir option.
precompile
Class method. It will precompile a list of template files into the specified cache
directory. See "PRECOMPILE".
clear_params
Empty all parameters.
debug_code (since 0.91_003)
If you get an error from the generated template, you might want to debug the executed
code. You can now call "debug_code" to get the compiled code and the line the error
occurred. Note that the reported line might not be the exact line where the error
occurred, also look around the line. The template filename reported does currently
only report the main template, not the name of an included template. I'll try to fix
that.
local $HTML::Template::Compiled::DEBUG = 1;
my $htc = HTML::Template::Compiled->new(
filename => 'some_file_with_runtime_error.html',
);
eval {
print $htc->output;
};
if ($@) {
# reports as text
my $msg = $htc->debug_code;
# reports as a html table
my $msg_html = $htc->debug_code('html');
}
get_plugin
my $plugin = $htc->get_plugin('Name::of::plugin');
Returns the plugin object of that classname. If the plugin is only a string (the
classname itself), it returns this string, so this method is only useful for plugin
objects.
var2expression
Useful for plugins. Parses a template var ("name="foo.bar.baz"" and returns the perl
expression for the compiler.
EXPORT
None.
CACHING
You create a template almost like in HTML::Template:
my $t = HTML::Template::Compiled->new(
path => 'templates',
loop_context_vars => 1,
filename => 'test.html',
# for testing without cache comment out
file_cache => 1,
file_cache_dir => "cache",
);
The next time you start your application and create a new template, HTC will read all
generated perl files, and a call to the constructor like above won't parse the template,
but just use the loaded code. If your template file has changed, though, then it will be
parsed again.
You can set the expire time of a template by passing the option
expire_time => $seconds
Note that
HTML::Template::Compiled->ExpireTime($seconds);
C<$HTML::Template::Compiled::NEW_CHECK>
are deprecated since they change a global variable which is then visible in the whole
process, so in persistent environments other apps might be affected.
So an expire time of 600 seconds (default) will check after 10 minutes if the tmpl file
was modified. Set it to a very high value will then ignore any changes, until you delete
the generated code. For development you should set it to 0, for a pre-production server
you can set it to 60 seconds, for example. It can make quite a difference.
PLUGINS
At the moment you can use and write plugins for the "ESCAPE" attribute. See
HTML::Template::Compiled::Plugin::XMLEscape for an example how to use it; and have a look
at the source code if you want to know how to write a plugin yourself.
Using Plugins:
my $htc = HTML::Template::Compiled->new(
...
plugin => ['HTML::Template::Compiled::Foo::Bar'],
# oor shorter:
plugin => ['::Foo::Bar'],
);
LAZY LOADING
Let's say you're in a CGI environment and have a lot of includes in your template, but
only few of them are actually used. HTML::Template::Compiled will (as HTML::Template does)
parse all of your includes at once. Just like the "use" function does in perl. To get a
behaviour like require, use HTML::Template::Compiled::Lazy.
TODO
associate, methods with simple parameters, expressions, pluggable, ...
IMPLEMENTATION
HTC generates a perl subroutine out of every template. Each included template is a
subroutine for itself. You can look at the generated code by activating file caching and
looking into the cache directory. When you call "output()", the subroutine is called. The
subroutine either creates a string and adds each template text or the results of the tags
to the string, or it prints it directly to a filehandle. Because of the implementation you
have to know at creation time of the module if you want to get a string back or if you
want to print to a filehandle.
SECURITY
HTML::Template::Compiled uses basically the same file caching model as, for example,
Template- Toolkit does: The compiled Perl code is written to disk and later reread via
"do" or by reading the file and "eval" the content.
If you are sharing a read/write environment with untrusted users (for example on a machine
with a webserver, like many webhosters offer, and all scripts are running as the same
httpd user), realize that there is possibility of modifying the Perl code that is cached
and then executed. The best solution is to not be in such an environment!
In this case it is the safest option to generate your compiled templates on a local
machine and just put the compiled templates onto the server, with no write access for the
http server. Set the "expire_time" option to a high value so that HTC never attempts to
check the template timestamp to force a regenerating of the code.
If you are alone on the machine, but you are running under taint mode (see perlsec) then
you have to explicitly set the $UNTAINT variable to 1. HTC will then untaint the code for
you and treat it as if it were safe (it hopefully is =).
PRECOMPILE
I think there is no way to provide an easy function for precompiling, because every
template can have different options. If you have all your templates with the same
options, then you can use the precompile class method. It works like this:
HTML::Template::Compiled->precompile(
# usual options like path, default_escape, global_vars, file_cache_dir, ...
filenames => [ list of template-filenames ],
);
This will then pre-compile all templates into file_cache_dir. Now you would just put this
directory onto the server, and it doesn't need any write-permissions, as it will be never
changed (until you update it because templates have changed).
BENCHMARKS
The options "case_sensitive", "loop_context_vars" and "global_vars" can have the biggest
influence on speed.
Setting case_sensitive to 1, loop_context_vars to 0 and global_vars to 0 saves time.
On the other hand, compared to HTML::Template, you have a large speed gain under mod_perl
if you use case_sensitive = 1, loop_context_vars = 0, With CGI HTC is slower.
See the "examples/bench.pl" contained in this distribution.
Here are some examples from the benchmark script. I'm showing only Template::AutoFilter,
Template::HTML, HTML::Template and HTC. These four modules allow to set automatic HTML
escaping ('filter') for all variables.
loop_context_vars 1
global_vars 0
case_sensitive 1
default_escape HTML (respectively Template::AutoFilter and Template::HTML)
ht: HTML::Template 2.10
htc: HTML::Template::Compiled 0.95
ttaf: Template::AutoFilter 0.112350 with Template 2.22
tth: Template::HTML 0.02 with Template 2.22
First test is with the test.(htc|tt) from the examples directory, about 900 bytes.
Test without file cache and without memory cache.
all_ht: 1 wallclock secs ( 0.40 usr + 0.00 sys = 0.40 CPU) @ 250.00/s (n=100)
all_htc: 1 wallclock secs ( 1.74 usr + 0.01 sys = 1.75 CPU) @ 57.14/s (n=100)
all_ttaf_new_object: 1 wallclock secs ( 1.69 usr + 0.01 sys = 1.70 CPU) @ 58.82/s (n=100)
all_tth_new_object: 1 wallclock secs ( 1.44 usr + 0.00 sys = 1.44 CPU) @ 69.44/s (n=100)
With file cache:
all_ht: 1 wallclock secs ( 1.03 usr + 0.01 sys = 1.04 CPU) @ 379.81/s (n=395)
all_htc: 1 wallclock secs ( 1.07 usr + 0.00 sys = 1.07 CPU) @ 260.75/s (n=279)
all_ttaf_new_object: 1 wallclock secs ( 1.07 usr + 0.04 sys = 1.11 CPU) @ 251.35/s (n=279)
all_tth_new_object: 1 wallclock secs ( 1.01 usr + 0.04 sys = 1.05 CPU) @ 227.62/s (n=239)
With memory cache:
all_ht: 1 wallclock secs ( 1.04 usr + 0.00 sys = 1.04 CPU) @ 461.54/s (n=480)
all_htc: 1 wallclock secs ( 1.05 usr + 0.01 sys = 1.06 CPU) @ 3168.87/s (n=3359)
process_ttaf: 1 wallclock secs ( 1.04 usr + 0.00 sys = 1.04 CPU) @ 679.81/s (n=707)
process_tth: 1 wallclock secs ( 1.05 usr + 0.00 sys = 1.05 CPU) @ 609.52/s (n=640)
Now I'm using a template with about 18Kb by multiplying the example template 20 times. You
can see that everything is running slower but some run more slower than others.
Test without file cache and without memory cache.
all_ht: 8 wallclock secs ( 7.57 usr + 0.04 sys = 7.61 CPU) @ 13.14/s (n=100)
all_htc: 32 wallclock secs (32.08 usr + 0.06 sys = 32.14 CPU) @ 3.11/s (n=100)
all_ttaf_new_object: 36 wallclock secs (36.21 usr + 0.04 sys = 36.25 CPU) @ 2.76/s (n=100)
all_tth_new_object: 29 wallclock secs (28.92 usr + 0.05 sys = 28.97 CPU) @ 3.45/s (n=100)
With file cache:
all_ht: 8 wallclock secs ( 7.22 usr + 0.00 sys = 7.22 CPU) @ 13.85/s (n=100)
all_htc: 5 wallclock secs ( 5.32 usr + 0.00 sys = 5.32 CPU) @ 18.80/s (n=100)
all_ttaf_new_object: 8 wallclock secs ( 7.59 usr + 0.15 sys = 7.74 CPU) @ 12.92/s (n=100)
all_tth_new_object: 9 wallclock secs ( 8.74 usr + 0.19 sys = 8.93 CPU) @ 11.20/s (n=100)
With memory cache:
all_ht: 1 wallclock secs ( 1.04 usr + 0.01 sys = 1.05 CPU) @ 15.24/s (n=16)
all_htc: 1 wallclock secs ( 1.12 usr + 0.00 sys = 1.12 CPU) @ 272.32/s (n=305)
process_ttaf: 1 wallclock secs ( 1.07 usr + 0.00 sys = 1.07 CPU) @ 39.25/s (n=42)
process_tth: 1 wallclock secs ( 1.05 usr + 0.00 sys = 1.05 CPU) @ 34.29/s (n=36)
So the performance difference highly depends on the size of the template and on the
various options. You can see that using the 900byte template HTC is slower with file
cache than HTML::Template, but with the 18Kb template it's faster.
EXAMPLES
See "objects.html" in examples (and "examples/objects.pl") for an example how to feed
objects to HTC.
BUGS
Probably many bugs I don't know yet =)
Use the bugtracking system to report a bug:
http://rt.cpan.org/NoAuth/Bugs.html?Dist=HTML-Template-Compiled
Why another Template System?
You might ask why I implement yet another templating system. There are so many to choose
from. Well, there are several reasons.
I like the syntax of HTML::Template *because* it is very restricted. It's also easy to
use (template syntax and API). However, there are some things I miss I try to implement
here.
I think while HTML::Template is quite good, the implementation can be made more efficient
(and still pure Perl). That's what I'm trying to achieve.
I use it in my web applications, so I first write it for myself =) If I can efficiently
use it, it was worth it.
RESOURCES
See http://htcompiled.sf.net/ for svn access.
SEE ALSO
HTML::Template
HTML::Template::JIT
Template - Toolkit
http://www.tinita.de/projects/perl/
AUTHOR
Tina Mueller
CREDITS
Sam Tregar big thanks for ideas and letting me use his HTML::Template test suite
Bjoern Kriews for original idea and contributions
Special Thanks to Sascha Kiefer - he finds all the bugs!
Ronnie Neumann, Martin Fabiani, Kai Sengpiel, Jan Willamowius, Justin Day, Steffen
Winkler, Henrik Tougaard for ideas, beta-testing and patches
<http://www.perlmonks.org/> and http://www.perl-community.de/> for everyday learning
Corion, Limbic~Region, tye, runrig and others from perlmonks.org
COPYRIGHT AND LICENSE
Copyright (C) 2005-2012 by Tina Mueller
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself, either Perl version 5.8.3 or, at your option, any later version of
Perl 5 you may have available.