Other Execution Enhancements in Visual C#

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methods add or remove the specified opcodes from the list of those that can be used The permit_only and deny_only methods explicitly define the entire list of allowed and restricted opcodes for the compartment The share method specifies the list of variables and subroutines from the enclosing script that can be shared with the compartment The NAME should include the variable type ($foo, @foo, and so on), and all the main object types are allowed All the shared items are assumed to be in the calling package Alternatively, you can use the share_from method to specify the package from which you want to share the symbols:
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$safe = new Safe; $safe->Share_from('main',['calc_sin', '$PI']); PROGRAMMING WITH PERL
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Once you have completed the mask and specified the opcodes that you want to enable (or disable), you run a Perl script either by supplying a text string or by using the reval method:
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$safe = new Safe; $safe->reval($script);
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Or you can point execution to an external file with the rdo method:
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$safe = new Safe; $safe->rdo($file);
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For the list of available opcodes on your machine, refer to the Opcode module for your platform The available list of opcodes is specific both to your platform and the current version of Perl, so a list here would be useless without the cross-reference of the specific module for your platform
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AM FL Y
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Part III
Developing Applications
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16
User Interface Tools
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Perl: The Complete Reference
he title of this chapter is a bit of a misnomer, but the practicalities are clear All the uses of Perl discussed so far have centered around the specifics of the Perl language When using Perl in the wide world, however, there are some niceties that can make the use of Perl easier for both the programmer and the user The most basic of these is to allow the user to supply information and instructions to a Perl script on the command line Most users will be familiar with command line arguments to programs, under both Windows and Unix Command line arguments can consist of either straight information (usually a file or hostname) or a series of options, signified by a preceding hyphen A number of methods, both manual and automatic, can help to extract the information from the command line, and we ll look at them in the beginning of this chapter If you are a programmer, you may have already encountered the problems associated with reporting information in a formatted presentation The most obvious method is to use the printf function to arrange the output data into a normalized format, but it suffers from numerous problems The most fundamental of these is that information may stretch beyond the width of an element specified in the printf format definition This means using regular expressions and/or functions to extract a specific number of characters from the data This is all too complex and still doesn t get around the difficulties presented by producing a report, such as accounting for page length and printing headers (and footers) on a page The solution to this with Perl is to use the Perl reporting mechanism (otherwise known as Formats) This allows you to define a fixed output format for printed information The format allows you to specify the justification (left, right, or centered) and even the template that should be used when printing floating point numbers Formats also automatically handle page sizes, line numbers, and headers, although you will need to work out a method for printing footers for yourself
Processing Command Line Arguments
Command line arguments are available to any script via the @ARGV array You can access this directly, either by referencing individual elements or by using the shift and pop functions The important thing to remember about the @ARGV array is that unlike many other languages (most notably C/C++), element zero is not the name of the script This is contained in the $0 variable This means that the first argument is at index zero, and therefore you can print out the entire command line argument list by printing the array:
print join(' ',@ARGV),"\n";
You can also use shift to take off individual arguments in sequence:
$filein = shift; $fileout = shift;
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