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Text::Indent
simple indentation of text shared among modules

Text::Indent - simple indentation of text shared among modules


NAME

Text::Indent - simple indentation of text shared among modules


SYNOPSIS

In your main program:


 use Text::Indent;

 my $indent = Text::Indent->new;

 $indent->spaces(2);

In a module to produce indented output:


 use Text::Indent;

 my $indent = Text::Indent->instance;

 $indent->increase;

 print $indent->indent("this will be indented two spaces");

 $indent->increase(2);

 print $indent->indent("this will be indented six spaces");

 $indent->decrease(3);


DESCRIPTION

Text::Indent is designed for use in programs which need to produce output with multiple levels of indent when the source of the output comes from different modules that know nothing about each other.

For example take module A, whose output includes the indented output of module B. Module B can also produce output directly, so it falls to module B to know whether it should indent it's output or not depending on it's calling context.

Text::Indent allows programs and modules to cooperate to choose an appropriate indent level that is shared within the program context. In the above example, module A would increase the indent level prior to calling the output routines of module B. Module B would simply use the Text::Indent instance confident that if it were being called directly no indent would be applied but if module A was calling it then it's output would be indented one level.


CONSTRUCTOR

The constructor for Text::Indent should only be called once by the main program using modules that produce indented text. Modules which wish to produce indented text should use the instance accessor described below.

To construct a new Text::Indent object, call the new method, passing one or more of the following parameters as a hash:

  • Spaces
  • the number of spaces to used for each level of indentation. Defaults to 2.

  • SpaceChar
  • the character to be used for indentation. Defaults to a space (ASCII 32)

  • Level
  • The initial indentation level to set. Defaults to 0.

  • AddNewLine
  • Whether the indent method should automatically add a newline to the input arguments. Defaults to TRUE.

  • Instance
  • Whether the newly constructed Text::Indent object should become the new singleton instance returned by the instance accessor. Defaults to TRUE.


INSTANCE ACCESSOR

The instance accessor is designed to be used by modules wishing to produce indented output. If the instance already exists (as will be the case if the main program using the module constructed a Text::Indent object) then both the program and the module will use the same indentation scheme.

If the instance does not exist yet, the instance accessor dispatches it's arguments to the constructor. As such, any of the parameters that the constructor takes may also be passed to the instance accessor. Be mindful that if the instance does exist, any parameters passed to the instance accessor are ignored.


METHODS

increase($how_many)

This method increases the level of indentation by $how_many levels. If not provided, $how_many defaults to 1.

decrease

This method decreases the level of indentation by $how_many levels. If not provided, $how_many defaults to 1.

reset

This method resets the level of indentation to 0. It is functionally equivalent to $ident->level(0).

indent(@what)

This is the primary workhorse method of Text::Indent. It takes a list of arguments to be indented and returns the indented string.

The string returned is composed of the following list:

If the indent level drops is a negative value, no indent is applied.


ACCESSORS

spaces

Gets or sets the number of spaces used for each indent level.

spacechar

Gets or sets the character used for indentation.

level

Gets or sets the current indent level.

add_newline

Gets or sets the boolean attribute that determines if the indent method tacks a newline onto it's arguments.


EXAMPLES

In the main program producing indented output:


 use Text::Indent;

 use Bar;

 my $bar = Bar->new(...);

 my $i = Text::Indent->new( Level => 1 );

 print $i->indent("foo");

 $i->increase;

 print $bar->display;

 $i->decrease;

 print $i->indent("baz");

 $i->reset;

 print $i->indent("gzonk");



In Bar.pm:


 package Bar;

 use Text::Indent;

 sub display

 {

   my $i = Text::Indent->instance;

   return $i->indent("bar");

 }



The output from the preceeding example would be (> indicates the left edge of output and is for illustrative purposes only):


 >  foo

 >    bar

 >  baz

 >gzonk




AUTHOR

James FitzGibbon, <jfitz@CPAN.org>


COPYRIGHT

Copyright (c) 2003 James FitzGibbon. All Rights Reserved.

This module is free software; you may use it under the same terms as Perl itself.

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