Class: BailoutTransform

Inherits:
GrammarTransform show all
Defined in:
lib/ruby_grammar_builder/transforms/bailout.rb

Instance Method Summary collapse

Methods inherited from GrammarTransform

#pre_transform

Methods inherited from GrammarPlugin

display_options, options

Constructor Details

#initialize(prefix, pattern) ⇒ BailoutTransform

Returns a new instance of BailoutTransform.



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# File 'lib/ruby_grammar_builder/transforms/bailout.rb', line 4

def initialize(prefix, pattern)
    @prefix = prefix
    @end_bailout = lookAheadFor(pattern).to_r
    @while_bailout = Pattern.new(/^/).maybe(/\s+/).lookAheadToAvoid(pattern).to_r
end

Instance Method Details

#collect_non_duplicate(rule, repository_name = nil) ⇒ Object 



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# File 'lib/ruby_grammar_builder/transforms/bailout.rb', line 43

def collect_non_duplicate(rule, repository_name = nil)
    if rule["match"]
        return [repository_name] if repository_name

        return []
    end

    if rule["patterns"]
        if rule.length == 1
            non_duplicate = rule["patterns"].reduce([]) do |memo, pat|
                next memo if memo.nil?

                non_duplicate_nested = collect_non_duplicate(pat)
                next nil if non_duplicate_nested.nil?

                next memo.concat(non_duplicate_nested)
            end

            unless non_duplicate.nil?
                return [repository_name] if repository_name

                return []
            end
        end
    end

    if rule[:repository]
        return rule[:repository].keys.reduce([]) do |memo, key|
            non_duplicate = collect_non_duplicate(rule[:repository][key], key)
            memo.concat(non_duplicate) if non_duplicate

            next memo
        end
    end
    nil
end

#post_transform(grammar_hash) ⇒ Object 



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# File 'lib/ruby_grammar_builder/transforms/bailout.rb', line 80

def post_transform(grammar_hash)
    non_duplicate = collect_non_duplicate(grammar_hash)
    pp non_duplicate
    duplicate = rewrite_rule(
        (non_duplicate.nil? ? [] : non_duplicate),
        grammar_hash.__deep_clone__,
    )

    pp grammar_hash[:repository]

    grammar_hash.__deep_clone__.merge(duplicate)
end

#rewrite_rule(non_duplicate, rule) ⇒ Object 



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# File 'lib/ruby_grammar_builder/transforms/bailout.rb', line 10

def rewrite_rule(non_duplicate, rule)
    return rule if rule["match"]

    if rule["includes"] && !non_duplicate.include?(rule["includes"])
        rule["includes"] = "##{@prefix}_#{rule['includes'][1..-1]}"
    end

    rule["end"] = "#{rule['end']}|#{@end_bailout}" if rule["end"]
    rule["while"] = "#{rule['while']}|(?:#{@while_bailout})" if rule["while"]

    rule["patterns"]&.map! { |pat| rewrite_rule(non_duplicate, pat) }

    if rule[:repository]
        rule[:repository] = Hash[
            rule[:repository].map do |key, pat|
                next [key, pat] if non_duplicate.include? key

                [
                    "#{@prefix}_#{key}",
                    rewrite_rule(non_duplicate, pat),
                ]
            end
        ]
    end

    rule["captures"]&.transform_values { |pat| rewrite_rule(non_duplicate, pat) }
    rule["beginCaptures"]&.transform_values { |pat| rewrite_rule(non_duplicate, pat) }
    rule["endCaptures"]&.transform_values { |pat| rewrite_rule(non_duplicate, pat) }
    rule["whileCaptures"]&.transform_values { |pat| rewrite_rule(non_duplicate, pat) }

    rule
end