The following is a blog entry about the development of Lazy::Text from the start, as a stand alone module and then as part of the Lazy::Text project, including the development of its core classes, the module documentation structure and some of the initial code. Although the Lazy module has been written for Perl 5.12.1 and earlier, the module is still generally applicable to any perl version up to 5.22.3.
The text module in Lazy::Text consists of two core classes, Text::Lazy and a separate module,Text::TextUtils.
The Text::Lazy module is the “framework” that encapsulates the code required to implement a text reader in a manner comparable to how perl’s built-in reader, String::Parse , operates.
Text::TextUtils is a library that provides access to some useful functions from Text::Lazy that a regular reader would not need to worry about. These include:
The $text attribute, which returns a Perl 5::Text object representing the current text (or the string “Hello “);
The $read attribute, which returns an object representing the current line.
The $line attribute, which returns the current line number.
The $wc attr, which returns an object representing a line character.
The $line_offset attribute, which returns a numeric offset in bytes from the beginning of the current line.
The $skip attribute, which returns an object representing a skipping character or line break (either a newline character, or the first character of a current line). Note that skipping characters will stop after a line break.
The $cnt attribute, which represents the number of characters read from the string. By default, $cnt = 0, which means that only 0-based code points are read.
The $line_start attribute, which returns the character of the current line (for $length = 1). By default, $line_start = 0, which means that the first line is included. Also, by default, any line that does not start or end with the current line will be dropped, which means that if you want each line to start and end with the first line, you must define $line_end = 0.
The $line attribute may be used to modify the line offset, and to return the next line as an alternative to skipping the current line. $line
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