| Name : perl-Text-EP3
| |
| Version : 1.10
| Vendor : obs://build_opensuse_org/devel:languages:perl
|
| Release : lp154.6.1
| Date : 2023-01-27 18:02:46
|
| Group : Development/Libraries/Perl
| Source RPM : perl-Text-EP3-1.10-lp154.6.1.src.rpm
|
| Size : 0.12 MB
| |
| Packager : https://www_suse_com/
| |
| Summary : The Extensible Perl PreProcessor
|
Description :
EP3 is a Perl5 program that preprocesses STDIN or some set of input files
and produces an output file. EP3 only works on input files and produces
output files. It seems to me that if you want to preprocess arrays or
somesuch, you should be using perl. EP3 was first developed to provide a
flexible preprocessor for the Verilog hardware description language.
Verilog presents some problems that were not easily solved by using cpp or
m4. I wanted to be able to use a normal preprocessor, but extend its
functionality. So I wrote EP3 - the Extensible Perl PreProcessor. The main
difference between EP3 and other preprocessors is its built-in
extensibility. Every directive in EP3 is really a method defined in EP3,
one of its submodules, or embedded in the file that is being processed. By
linking the directive name to the associated methods, other methods could
be added, thus extending the preprocessor.
Many of the features of EP3 can be modified via command line switches. For
every command line switch, there is an also accessor method.
* Directives and Method Invocation
Directives are preceded with the a user defined delimeter. The default
delimeter is `AATT\'. This delimeter was chosen to avoid conflicts with other
preprocessor delimeters (`#\' and the Verilog backtick), as well as
Verilog syntax that might be found a the beginning of a line (`$\', `&\',
etc.). A directive is defined in Perl as the beginning of the line, any
amount of whitespace, and the delimeter immediately followed by Perl word
characters (0-9A-Za-z_).
EP3 looks for directives, strips off the delimeter, and then invokes a
method of the same name. The standard directives are defined within the
EP3 program. Library or user defined directives may be loaded as perl
modules either via the use command or from a command line switch for
inclusion at the beginning of the EP3 run. Using the \"include\" directive
coupled with the \"perl_begin/end\" directives perl subroutines (and hence
EP3 directives) may be dynamically included during the EP3 run.
* Directive Extension Method 1: The use command.
A module may be included with the use statement provided that it pushes
its package name onto EP3\'s AATTISA array (thus telling EP3 to inherit its
methods). For a Verilog module whose filename is Verilog.pm and has the
package name Text::EP3::Verilog, the following line must be included ...
push (AATTText::EP3::ISA, qw(Text::EP3::Verilog));
This package can then be simply included in whatever script you are using
to call EP3 with the line:
use Text::EP3::Verilog;
All methods within the module are now available to EP3 as directives.
* Directive Extension Method 2: The command line switch.
A module can be included at run time with the -module modulename switch
on the command line (assuming the ep3_parse_command_line method is
invoked). The modulename is assumed to have a .pm extension and exist
somewhere in the directories specified in AATTINC. All methods within the
module are now available to EP3 as directives.
* Directive Extension Method 3: The ep3_modules accessor method.
Modules can be added by using the accessor method ep3_modules.
$preprocessor->ep3_modules(\"module1\",\"module2\", ....);
All methods within the module are now available to EP3 as directives.
* Directive Extension Method 4: Embedded in the source code or included
files.
Using the perl_begin and perl_end directives to delineate perl sections,
subroutines can be declared (as methods) anywhere in a processed file or
in a file that the process file includes. In this way, runtime methods
are made available to EP3. For example ...
1 Text to be printed ...
AATTperl_begin
sub hello {
my $self = shift;
print \"Hello there\
\";
}
AATTperl_end
2 Text to be printed ...
AATThello
3 Text to be printed ...
would result in
1 Text to be printed ...
2 Text to be printed ...
Hello there
3 Text to be printed ...
Using this method, libraries of directives can be built and included with
the include directive (but it is recommended that they be moved into a
module when they become static).
* Input Files and Processing
Input files are processed one line at a time. The EP3 engine attempts to
perform substitutions with elements stored in macro/define/replace lists.
All directive lines are preprocessed before being evaluated (the only
exception being the key portions of the if[n]def and define directives).
Directive lines can be extended across multiple lines by placing the `\\\'
character at the end of each line. Comments are normally protected from
the preprocessor, but protection can be dynamically turned off and then
back on. From a command line switch, comments can also be deleted from
the output.
* Output Files
EP3 typically writes output to Perl\'s STDOUT, but can be assigned to any
output file. EP3 can also be run in \"dependency check\" mode via a command
line switch. In this mode, normal output is suppressed, and all dependent
files are output in the order accessed. NOTE! EP3 uses the select call to
change the default output file for included perl blocks. However, if you
are using a method invocation of ep3, note that the default output for
the rest of your script will be changed as well. (This can be easily
worked with, but should be known beforehand).
Most parameters can be modified before invoking EP3 including directive
string, comment delimeters, comment protection and inclusion, include
path, and startup defines.
|
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