Ubuntu Manpage: Mason::Interp - Mason Interpreter

NAME

       Mason::Interp - Mason Interpreter

SYNOPSIS

           my $interp = Mason->new(
               comp_root => '/path/to/comps',
               data_dir  => '/path/to/data',
               ...
           );
           my $output = $interp->run( '/request/path', foo => 5 )->output();

DESCRIPTION

       Interp is the central Mason object, returned from "Mason->new". It is responsible for creating new
       requests, compiling components, and maintaining the cache of loaded components.

PARAMETERS TO THE new() CONSTRUCTOR

allow_globals (varnames)
List of one or more global variable names that will be available in all components, like $m is by
default.

allow_globals => [qw($dbh)]

As in any programming environment, globals should be created sparingly (if at all) and only when
other mechanisms (parameter passing, attributes, singletons) will not suffice.
Catalyst::View::Mason2, for example, creates a $c global set to the context object in each request.

Set the values of globals with set_global.

autobase_names
Array reference of autobase filenames to check in order when determining a component's superclass.
Default is "["Base.mp", "Base.mc"]".

autoextend_request_path
Whether to automatically add the top level extensions (by default ".mp" and ".mc") to the request
path when searching for a matching page component. Defaults to true.

class_header
Perl code to be added at the top of the compiled class for every component, e.g. to bring in common
features or import common methods. Default is the empty string.

# Add to the top of every component class:
# use Modern::Perl;
# use JSON::XS qw(encode_json decode_json);
#
my $mason = Mason->new(
...
class_header => qq(
use Modern::Perl;
use JSON::XS qw(encode_json decode_json);
),
);

This is used by Mason::Compilation::output_class_header. For more advanced usage you can override
that method in a subclass or plugin.

comp_root
Required. The component root marks the top of your component hierarchy and defines how component
paths are translated into real file paths. For example, if your component root is
/usr/local/httpd/docs, a component path of /products/sales.mc translates to the file
/usr/local/httpd/docs/products/sales.mc.

This parameter may be either a single path or an array reference of paths. If it is an array
reference, the paths will be searched in the provided order whenever a component path is resolved,
much like Perl's @INC.

component_class_prefix
Prefix to use in generated component classnames. Defaults to 'MC' plus the interpreter's count, e.g.
MC0. So a component '/foo/bar' would get a classname like 'MC0::foo::bar'.

data_dir
The data directory is a writable directory that Mason uses for various features and optimizations:
for example, component object files and data cache files. Mason will create the directory on startup
if necessary.

Defaults to a temporary directory that will be cleaned up at process end. This will hurt performance
as Mason will have to recompile components on each run.

dhandler_names
Array reference of dhandler file names to check in order when resolving a top-level path. Default is
"["dhandler.mp", "dhandler.mc"]". An empty list disables this feature.

index_names
Array reference of index file names to check in order when resolving a top-level path. Default is
"["index.mp", "index.mc"]". An empty list disables this feature.

no_source_line_numbers
Do not put in source line number comments when generating code. Setting this to true will cause
error line numbers to reflect the real object file, rather than the source component.

object_file_extension
Extension to add to the end of object files. Default is ".mobj".

plugins
A list of plugins and/or plugin bundles:

plugins => [
'OnePlugin',
'AnotherPlugin',
'+My::Mason::Plugin::AThirdPlugin',
'@APluginBundle',
'-DontLikeThisPlugin',
]);

See Mason::Manual::Plugins.

out_method
Default out_method passed to each new request.

pure_perl_extensions
A listref of file extensions of components to be considered as pure perl (see Pure Perl Components).
Default is "['.mp']". If an empty list is specified, then no components will be considered pure perl.

static_source
True or false, default is false. When false, Mason checks the timestamp of the component source file
each time the component is used to see if it has changed. This provides the instant feedback for
source changes that is expected for development. However it does entail a file stat for each
component executed.

When true, Mason assumes that the component source tree is unchanging: it will not check component
source files to determine if the memory cache or object file has expired. This can save many file
stats per request. However, in order to get Mason to recognize a component source change, you must
touch the static_source_touch_file.

We recommend turning this mode on in your production sites if possible, if performance is of any
concern.

static_source_touch_file
Specifies a filename that Mason will check once at the beginning of every request when in
static_source mode. When the file timestamp changes (indicating that a component has changed), Mason
will clear its in-memory component cache and recheck existing object files.

top_level_extensions
A listref of file extensions of components to be considered "top level", accessible directly from
"$interp->run" or a web request. Default is "['.mp', '.mc']". If an empty list is specified, then
there will be no restriction; that is, all components will be considered top level.

CUSTOM MASON CLASSES

       These parameters specify alternate classes to use instead of the default Mason:: classes.

       For example, to use your own Compilation base class:

           my $interp = Mason->new(base_compilation_class => 'MyApp::Mason::Compilation', ...);

       Relevant plugins, if any, will applied to this class to create a final class, which you can get with

           $interp->compilation_class

       base_code_cache_class
           Specify alternate to Mason::CodeCache

       base_compilation_class
           Specify alternate to Mason::Compilation

       base_component_class
           Specify alternate to Mason::Component

       base_component_moose_class
           Specify alternate to Mason::Component::Moose

       base_component_class_meta_class
           Specify alternate to Mason::Component::ClassMeta

       base_component_import_class
           Specify alternate to Mason::Component::Import

       base_request_class
           Specify alternate to Mason::Request

       base_result_class
           Specify alternate to Mason::Result

PUBLIC METHODS

       all_paths ([dir_path])
           Returns  a  list  of  distinct component paths under dir_path, which defaults to '/' if not provided.
           For example,

              $interp->all_paths('/foo/bar')
                 => ('/foo/bar/baz.mc', '/foo/bar/blargh.mc')

           Note that these are all component paths, not filenames, and all component roots are searched if there
           are multiple ones.

       comp_exists (path)
           Returns a boolean indicating whether a component exists for the absolute component path.

       count
           Returns the number of this interpreter, a monotonically increasing integer for the  process  starting
           at 0.

       flush_code_cache
           Empties the component cache and removes all component classes.

       glob_paths (pattern)
           Returns a list of all component paths matching the glob pattern. e.g.

              $interp->glob_paths('/foo/b*.mc')
                 => ('/foo/bar.mc', '/foo/baz.mc')

           Note that these are all component paths, not filenames, and all component roots are searched if there
           are multiple ones.

       load (path)
           Returns  the  component  object corresponding to an absolute component path, or undef if none exists.
           Dies with an error if the component fails to load because of a syntax error.

       object_dir
           Returns the directory containing component object files.

       run ([request params], path, args...)
           Creates a new Mason::Request object for  the  given  path  and  args,  and  executes  it.  Returns  a
           Mason::Result object, which is generally accessed to get the output. e.g.

               my $output = $interp->run('/foo/bar', baz => 5)->output;

           The  first  argument  may  optionally  be  a  hashref  of request parameters, which are passed to the
           Mason::Request constructor. e.g. this tells the request to output to standard output:

               $interp->run({out_method => sub { print $_[0] }}, '/foo/bar', baz => 5);

       set_global (varname, value)
           Set the global varname to value. This will be visible in all components loaded by  this  interpreter.
           The variables must be on the allow_globals list.

               $interp->set_global('$scalar', 5);
               $interp->set_global('$scalar2', $some_object);

           See also set_global.

MODIFIABLE METHODS

       These methods are not intended to be called externally, but may be useful to modify with method modifiers
       in plugins and subclasses. Their APIs will be kept as stable as possible.

       is_pure_perl_comp_path ($path)
           Determines whether $path is a pure Perl component - by default, uses pure_perl_extensions.

       is_top_level_comp_path ($path)
           Determines whether $path is a valid top-level component - by default, uses top_level_extensions.

       modify_loaded_class ( $compc )
           An  opportunity  to modify loaded component class $compc (e.g. add additional methods or apply roles)
           before it is made immutable.

       write_object_file ($object_file, $object_contents)
           Write compiled  component  $object_contents  to  $object_file.  This  is  an  opportunity  to  modify
           $object_contents before it is written, or $object_file after it is written.

AUTHOR

       Jonathan Swartz <swartz@pobox.com>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 by Jonathan Swartz.

       This  is  free  software;  you  can  redistribute  it and/or modify it under the same terms as the Perl 5
       programming language system itself.

perl v5.34.0                                       2022-05-27                                 Mason::Interp(3pm)