Class: Interscript::Interpreter::Stage

Inherits:
Object
  • Object
show all
Defined in:
lib/interscript/interpreter.rb

Instance Method Summary collapse

Constructor Details

#initialize(map, str) ⇒ Stage

Returns a new instance of Stage.



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# File 'lib/interscript/interpreter.rb', line 73

def initialize(map, str)
  @str = str
  @map = map
end

Instance Method Details

#build_item(i, target = nil, doc = @map) ⇒ Object 



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# File 'lib/interscript/interpreter.rb', line 171

def build_item i, target=nil, doc=@map
  i = i.nth_string if %i[str parstr].include? target
  i = Interscript::Node::Item.try_convert(i)
  target = :par if target == :parstr

  out = case i
  when Interscript::Node::Item::Alias
    if i.map
      d = doc.dep_aliases[i.map].document
      a = d.imported_aliases[i.name]
      raise Interscript::SystemConversionError, "Alias #{i.name} of #{i.stage.map} not found" unless a
      build_item(a.data, target, d)
    elsif Interscript::Stdlib::ALIASES.include?(i.name)
      if target != :re && Interscript::Stdlib.re_only_alias?(i.name)
        raise Interscript::SystemConversionError, "Can't use #{i.name} in a #{target} context"
      end
      Interscript::Stdlib::ALIASES[i.name]
    else
      a = doc.imported_aliases[i.name]
      raise Interscript::SystemConversionError, "Alias #{i.name} not found" unless a
      build_item(a.data, target, doc)
    end
  when Interscript::Node::Item::String
    if [:str, :par].include? target
      i.data
    else#if target == :re
      Regexp.escape(i.data)
    end
  when Interscript::Node::Item::Group
    if target == :par
      i.children.map do |j|
        build_item(j, target, doc)
      end.reduce([""]) do |j,k|
        Array(j).product(Array(k)).map(&:join)
      end
    else
      i.children.map { |j| build_item(j, target, doc) }.join
    end
  when Interscript::Node::Item::CaptureGroup
    if target == :par
      raise Interscript::SystemConversionError, "Can't use a CaptureGroup in a #{target} context"
    end
    "(" + build_item(i.data, target, doc) + ")"
  when Interscript::Node::Item::Maybe,
       Interscript::Node::Item::MaybeSome,
       Interscript::Node::Item::Some

    resuffix = { Interscript::Node::Item::Maybe     => "?" ,
                 Interscript::Node::Item::Some      => "+" ,
                 Interscript::Node::Item::MaybeSome => "*" }[i.class]

    if target == :par
      raise Interscript::SystemConversionError, "Can't use a MaybeSome in a #{target} context"
    end
    if Interscript::Node::Item::String === i.data && i.data.data.length != 1
      "(?:" + build_item(i.data, target, doc) + ")" + resuffix
    else
      build_item(i.data, target, doc) + resuffix
    end
  when Interscript::Node::Item::CaptureRef
    if target == :par
      raise Interscript::SystemConversionError, "Can't use CaptureRef in parallel mode"
    end
    "\\#{i.id}"
  when Interscript::Node::Item::Any
    if target == :str
      # We may never reach this point
      raise Interscript::SystemConversionError, "Can't use Any in a string context"
    elsif target == :par
      i.data.map(&:data)
    elsif target == :re
      case i.value
      when Array
        data = i.data.map { |j| build_item(j, target, doc) }
        "(?:"+data.join("|")+")"
      when String
        "[#{Regexp.escape(i.value)}]"
      when Range
        "[#{Regexp.escape(i.value.first)}-#{Regexp.escape(i.value.last)}]"
      end
    end
  end
end

#build_regexp(r) ⇒ Object 



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# File 'lib/interscript/interpreter.rb', line 155

def build_regexp(r)
  from = build_item(r.from, :re)
  before = build_item(r.before, :re) if r.before
  after = build_item(r.after, :re) if r.after
  not_before = build_item(r.not_before, :re) if r.not_before
  not_after = build_item(r.not_after, :re) if r.not_after

  re = ""
  re += "(?<=#{before})" if before
  re += "(?<!#{not_before})" if not_before
  re += from
  re += "(?!#{not_after})" if not_after
  re += "(?=#{after})" if after
  re
end

#execute_rule(r) ⇒ Object 



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# File 'lib/interscript/interpreter.rb', line 78

def execute_rule r
  return if r.reverse_run == true
  case r
  when Interscript::Node::Group::Parallel
    if r.cached_tree
      @str = Interscript::Stdlib.parallel_replace_tree(@str, r.cached_tree)
    elsif r.subs_regexp && r.subs_replacements
      if $DEBUG_RE
        @str = Interscript::Stdlib.parallel_regexp_gsub_debug(@str, r.subs_regexp, r.subs_replacements)
      else
        @str = Interscript::Stdlib.parallel_regexp_gsub(@str, r.subs_regexp, r.subs_replacements)
      end
    else
      begin
        # Try to build a tree
        subs_array = []
        r.children.each do |i|
          raise Interscript::SystemConversionError, "Can't parallelize #{i.class}" unless Interscript::Node::Rule::Sub === i
          raise Interscript::SystemConversionError, "Can't parallelize rules with :before" if i.before
          raise Interscript::SystemConversionError, "Can't parallelize rules with :after" if i.after
          raise Interscript::SystemConversionError, "Can't parallelize rules with :not_before" if i.not_before
          raise Interscript::SystemConversionError, "Can't parallelize rules with :not_after" if i.not_after
          next if i.reverse_run == true
          subs_array << [build_item(i.from, :par), build_item(i.to, :parstr)]
        end
        tree = Interscript::Stdlib.parallel_replace_compile_tree(subs_array) #.sort_by{|k,v| -k.length})
        @str = Interscript::Stdlib.parallel_replace_tree(@str, tree)
        r.cached_tree = tree
        # $using_tree = true
      rescue
        # $using_tree = false
        # Otherwise let's build a megaregexp
        subs_array = []
        Interscript::Stdlib.deterministic_sort_by_max_length(r.children).each do |i|  # rule.from.max_length gives somewhat better test results, why is that
          raise Interscript::SystemConversionError, "Can't parallelize #{i.class}" unless Interscript::Node::Rule::Sub === i
          next if i.reverse_run == true
          subs_array << [build_regexp(i), build_item(i.to, :parstr)]
        end
        r.subs_regexp = Interscript::Stdlib.parallel_regexp_compile(subs_array)
        r.subs_replacements = subs_array.map(&:last)
        if $DEBUG_RE
          # puts subs_array.inspect
          $subs_array = subs_array
          @str = Interscript::Stdlib.parallel_regexp_gsub_debug(@str, r.subs_regexp, r.subs_replacements)
        else
          @str = Interscript::Stdlib.parallel_regexp_gsub(@str, r.subs_regexp, r.subs_replacements)
        end
      end
    end
  when Interscript::Node::Group
    r.children.each do |t|
      execute_rule(t)
    end
  when Interscript::Node::Rule::Sub
    if r.to == :upcase
      @str = @str.gsub(Regexp.new(build_regexp(r)), &:upcase)
    elsif r.to == :downcase
      @str = @str.gsub(Regexp.new(build_regexp(r)), &:downcase)
    else
      @str = @str.gsub(Regexp.new(build_regexp(r)), build_item(r.to, :str))
    end
  when Interscript::Node::Rule::Funcall
    @str = Interscript::Stdlib::Functions.public_send(r.name, @str, **r.kwargs)
  when Interscript::Node::Rule::Run
    if r.stage.map
      doc = @map.dep_aliases[r.stage.map].document
      stage = doc.imported_stages[r.stage.name]
      @str = Stage.new(doc, @str).execute_rule(stage)
    else
      stage = @map.imported_stages[r.stage.name]
      @str = Stage.new(@map, @str).execute_rule(stage)
    end
  end

  @str
end