08-05-2016
Thank you bakunin for your reply, but your reply is not relevant to my question. I spent a lot of time writing the question and I guess you did not have time to read it as carefully as I had wrote it.
However, your reply did help, in that, while thinking whether it is relevant or not, I finally understood the whole thing.
For the benefit of newbies, I will post my understanding and answers here:
1 and 2. Yes. Of course these labels are misleading, and make the grammar hard to understand for newbies.
3. No. Instead, it is best to apply Rule 7b also to the 2 productions in the grammar, that reduce cmd_prefix to ASSIGNMENT_WORD.
4. No. I misunderstood here how the "rules" are applied. I thought, you first perform the reduction, then somehow apply the rule (which makes no sense). Instead, you use the rule first, in order to allow the reduction.
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LEARN ABOUT DEBIAN
css::dom::rule
CSS::DOM::Rule(3pm) User Contributed Perl Documentation CSS::DOM::Rule(3pm)
NAME
CSS::DOM::Rule - CSS rule class for CSS::DOM
VERSION
Version 0.14
SYNOPSIS
use CSS::DOM::Rule ':all'; # import constants
use CSS::DOM;
$sheet = new CSS::DOM;
$sheet->insertRule('bla blah blah {}');
$rule = $sheet->cssRules->[0];
$rule->type; # STYLE_RULE
$rule->cssText; # 'bla blah blah {}' or similar
$rule->cssText('p { margin: 0 }'); # replace it
$rule->parentStyleSheet; # $sheet
DESCRIPTION
This module provides the CSS rule class for CSS::DOM. It implements the CSSRule and CSSUnknownRule DOM interfaces.
METHODS
Constructor
Only call the constructor on this class to create an 'unknown' rule. You have to call the constructor on a particular subclass to get
another type. Normally you do not need to call this directly anyway. (See CSS::DOM's "parse" and "insertRule" methods.) But just in case
you do want to call it, here it is:
new CSS::DOM::Rule $parent; # unknown rule
require CSS::DOM::Rule::Style
new CSS::DOM::Rule::Style $parent;
# etc.
$parent is the parent rule, if the rule is nested, or the parent style sheet otherwise.
Object Methods
type
Returns one of the constants below indicating the type of rule.
cssText
Returns this rule's CSS code. If you pass an argument, it will be parsed as the new CSS code for this rule (replacing the existing
data), and the old value will be returned. This method will die if the replacement CSS code creates a different type of rule.
parentStyleSheet
This returns the style sheet to which the rule belongs.
parentRule
This returns the rule's parent rule, if there is one, or an empty list otherwise. There is only a parent rule if this one is nested,
e.g., inside a media rule.
EXPORTS
The following constants that indicate the type of rule will be exported on request (individually or with the ':all' tag):
UNKNOWN_RULE
STYLE_RULE
CHARSET_RULE
IMPORT_RULE
MEDIA_RULE
FONT_FACE_RULE
PAGE_RULE
SEE ALSO
CSS::DOM
CSS::DOM::Rule::Style
CSS::DOM::Rule::Media
CSS::DOM::Rule::Page
CSS::DOM::Rule::Import
perl v5.10.1 2010-12-10 CSS::DOM::Rule(3pm)