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HTML::Mason::Lexer(3pm) User Contributed Perl Documentation HTML::Mason::Lexer(3pm)
NAME
HTML::Mason::Lexer - Generates events based on component source lexing
SYNOPSIS
my $lexer = HTML::Mason::Lexer->new;
$lexer->lex( comp_source => $source, name => $comp_name, compiler => $compiler );
DESCRIPTION
The Lexer works in tandem with the Compiler to turn Mason component source into something else, generally Perl code.
As the lexer finds component elements, like a tag or block, it calls the appropriate event methods in the compiler object it was given.
It has only a few public methods.
You can replace this lexer with one of your own simply by telling the Compiler to use a different lexer class. Your lexer class simply
needs to call the appropriate methods in the Component Class's API as it scans the source.
METHODS
The lexer has very few public methods.
new This method creates a new Lexer object. This methods takes no parameters.
lex ( comp_source => ..., name => ..., compiler => ... )
This method tells the lexer to start scanning the given component source. All of these parameters are required. The "name" parameter
will be used in any error messages generated during lexing. The "compiler" object must be an object that implements the Mason
Component API.
line_number
The current line number that the lexer has reached.
name
The name of the component currently being lexed.
throw_syntax_error ($error)
This throws an "HTML::Mason::Exception::Syntax" error with the given error message as well as additional information about the
component source.
This method is used by both the Lexer and the Compiler.
SUBCLASSING
Any subclass of the lexer should declare itself to be a subclass of "HTML::Mason::Lexer", even if it plans to override all of its public
methods.
If you want your subclass to work with the existing Compiler classes in Mason, you must implement the methods listed above. If you plan to
use a custom Compiler class that you're writing, you can do whatever you want.
We recommend that any parameters you add to Lexer be read-only, because the compiler object_id is only computed once on creation and would
not reflect any changes to Lexer parameters.
perl v5.14.2 2012-02-04 HTML::Mason::Lexer(3pm)