Class: Regexp_to_SMTLIB

Inherits:
Object
  • Object
show all
Defined in:
lib/regexp-to-smtlib.rb

Class Method Summary collapse

Class Method Details

.translate_anchored_regexp_to_SMTLIB(regex_str) ⇒ Object 



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# File 'lib/regexp-to-smtlib.rb', line 17

def self.translate_anchored_regexp_to_SMTLIB(regex_str)
begin
    rest = regex_str
    res = []
    found = true
    endindex = nil
    while found do
    found = false
    if rest =~ /^\[([^\]]*)\](\*|\+|\?|\{(\d+),(\d+)\})?/ then
        inner = $1
        multiplicator = $2
        endindex = $~.end(0)
        range = translate_regexp_range_to_SMTLIB(inner)
        if multiplicator then
        res << translate_multiplicator_for_re_to_SMTLIB(multiplicator, range)
        found = true
        else
        res << range
        found = true
        end
    elsif rest =~ /^([^\[]+)(\*|\+|\?|\{(\d+),(\d+)\})?/
        string = $1
        multiplicator = $2
        endindex = $~.end(0)

        inner = "(str.to.re #{string.inspect})"
        if multiplicator then
        res << translate_multiplicator_for_re_to_SMTLIB(multiplicator, inner)
        found = true
        else
        res << inner
        found = true
        end
    end
    rest = rest.slice(endindex, rest.length) if rest
    end
    if res.size > 1 then
        return "(re.++ #{res.join(" ")})"
    else
        if res.empty? then
        return "re.nostr"
        else
        return res.first
        end
    end
rescue RuntimeError => rte
    raise RuntimeError.new("cannot parse regex: #{regex_str.inspect}: #{rte.message}")
end

    # TODO
    # - . => re.allchar
    # * abc => re.++
    # - string => str.to.re
    # * [A-Z] => re.range
    # * [abc] => re.union
    # * * => re.*
    # * + => re.+
    # * ? => re.opt
    # * {a,b} => re.loop
end

.translate_multiplicator_for_re_to_SMTLIB(multiplicator, expr) ⇒ Object 



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# File 'lib/regexp-to-smtlib.rb', line 78

def self.translate_multiplicator_for_re_to_SMTLIB(multiplicator, expr)
    if multiplicator == "*" then
        return "(re.* #{expr})"
    elsif multiplicator == "+" then
        return "(re.+ #{expr})"
    elsif multiplicator == "?" then
        return "(re.opt #{expr})"
    elsif multiplicator =~ /\{(\d+),(\d+)\}/ then
    begin
        lower = Integer($1)
        upper = Integer($2)
    rescue TypeError => e
        raise RuntimeError.new("cannot parse regexp (#{$1} or #{$2} is no Integer)")
    end
        return "((_ re.loop #{lower} #{upper}) #{expr})"
    else
        raise RuntimeError.new("invalid multiplicator: #{multiplicator}")
    end
end

.translate_regexp_range_to_SMTLIB(range) ⇒ Object

TODO: range complement with ^



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# File 'lib/regexp-to-smtlib.rb', line 99

def self.translate_regexp_range_to_SMTLIB(range)
    rest = range
    res = []
    while rest =~ /^(.)\-(.)/ do
        ch1 = $1
        ch2 = $2
        res << "(re.range \"#{ch1}\" \"#{ch2}\")"
        rest = rest.slice($~.end(0), rest.length)
    end
    if res.size > 1 then
    return "(re.union #{res.join(" ")})"
    else
    if res.empty? then
        return "re.nostr"
    else
        return res.first
    end
    end
end

.translate_regexp_to_SMTLIB(regex_str) ⇒ Object 



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# File 'lib/regexp-to-smtlib.rb', line 5

def self.translate_regexp_to_SMTLIB(regex_str)
    if regex_str =~ /^\^(.*)\$$/ then
        return translate_anchored_regexp_to_SMTLIB($1)
    elsif regex_str =~ /^\^(.*)$/ then
        return "(re.++ #{translate_anchored_regexp_to_SMTLIB($1)} (re.* re.allchar))"
    elsif regex_str =~ /^(.*)\$$/ then
        return "(re.++ (re.* re.allchar) #{translate_anchored_regexp_to_SMTLIB($1)})"
    else
        return "(re.++ (re.* re.allchar) #{translate_anchored_regexp_to_SMTLIB($1)} (re.* re.allchar))"
    end
end