Class: Interscript::Compiler::Ruby

Inherits:
Interscript::Compiler show all
Defined in:
lib/interscript/compiler/ruby.rb

Instance Attribute Summary

Attributes inherited from Interscript::Compiler

#code

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Interscript::Compiler

call

Class Method Details

.read_debug_data ⇒ Object 



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# File 'lib/interscript/compiler/ruby.rb', line 260

def self.read_debug_data
  $map_debug || []
end

.reset_debug_data ⇒ Object 



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# File 'lib/interscript/compiler/ruby.rb', line 264

def self.reset_debug_data
  $map_debug = []
end

Instance Method Details

#build_regexp(r, map = @map) ⇒ Object 



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# File 'lib/interscript/compiler/ruby.rb', line 120

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

#call(str, stage = :main) ⇒ Object 



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# File 'lib/interscript/compiler/ruby.rb', line 255

def call(str, stage=:main)
  load
  Interscript::Maps.transliterate(@map.name, str, stage)
end

#compile(map, debug: false) ⇒ Object 



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# File 'lib/interscript/compiler/ruby.rb', line 4

def compile(map, debug: false)
  @map = map
  @debug = debug
  @parallel_trees = {}
  @parallel_regexps = {}
  c = "require 'interscript/stdlib'\n"
  c << "if !defined?(Interscript::Maps); module Interscript; module Maps\n"
  c << "module Cache; end\n"
  c << "class Map < Struct.new(:stages, :aliases, :aliases_re); end\n"
  c << "@maps = Hash.new { |h,id| h[id] = Map.new({},{},{}) }\n"
  c << "def self.has_map?(map);                      @maps.include?(map); end\n"
  c << "def self.add_map_alias(map,name,value)       @maps[map].aliases[name] = value; end\n"
  c << "def self.add_map_alias_re(map,name,value)    @maps[map].aliases_re[name] = value; end\n"
  c << "def self.add_map_stage(map,stage,&block);    @maps[map].stages[stage] = block; end\n"
  c << "def self.get_alias(map,name);                @maps[map].aliases[name]; end\n"
  c << "def self.get_alias_re(map,name);             @maps[map].aliases_re[name]; end\n"
  c << "def self.transliterate(map,string,stage=:main); @maps[map].stages[stage].(string); end\n"
  c << "end; end; end\n"
  c

  map.aliases.each do |name, value|
    val = compile_item(value.data, map, :str)
    c << "Interscript::Maps.add_map_alias(#{map.name.inspect}, #{name.inspect}, #{val})\n"
    val = '/'+compile_item(value.data, map, :re).gsub('/', '\\\\/')+'/'
    c << "Interscript::Maps.add_map_alias_re(#{map.name.inspect}, #{name.inspect}, #{val})\n"
  end

  map.stages.each do |_, stage|
    c << compile_rule(stage, @map, true)
  end
  @parallel_trees.each do |k,v|
    c << "Interscript::Maps::Cache::PTREE_#{k} ||= #{v.inspect}\n"
  end
  @parallel_regexps.each do |k,v|
    c << "Interscript::Maps::Cache::PRE_#{k} ||= #{v.inspect}\n"
  end
  @code = c
end

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



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# File 'lib/interscript/compiler/ruby.rb', line 136

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

  out = case i
  when Interscript::Node::Item::Alias
    astr = 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
      "Interscript::Maps.get_alias_ALIASTYPE(#{a.doc_name.inspect}, #{a.name.inspect})"
    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
      stdlib_alias = true
      "Interscript::Stdlib::ALIASES[#{i.name.inspect}]"
    else
      a = doc.imported_aliases[i.name]
      raise Interscript::SystemConversionError, "Alias #{i.name} not found" unless a

      "Interscript::Maps.get_alias_ALIASTYPE(#{a.doc_name.inspect}, #{a.name.inspect})"
    end

    if target == :str
      astr = astr.sub("_ALIASTYPE(", "(")
    elsif target == :re
      astr = "\#{#{astr.sub("_ALIASTYPE(", "_re(")}}"
    elsif parstr && stdlib_alias
      astr = Interscript::Stdlib::ALIASES[i.name]
    elsif target == :par
      # raise NotImplementedError, "Can't use aliases in parallel mode yet"
      astr = Interscript::Stdlib::ALIASES[i.name]
    end
  when Interscript::Node::Item::String
    if target == :str
      # Replace \1 with \\1, this is weird, but it works!
      i.data.gsub("\\", "\\\\\\\\").inspect
    elsif target == :par
      i.data
    elsif target == :re
      Regexp.escape(i.data)
    end
  when Interscript::Node::Item::Group
    if target == :par
      i.children.map do |j|
        compile_item(j, doc, target)
      end.reduce([""]) do |j,k|
        Array(j).product(Array(k)).map(&:join)
      end
    elsif target == :str
      i.children.map { |j| compile_item(j, doc, target) }.join("+")
    elsif target == :re
      i.children.map { |j| compile_item(j, doc, target) }.join
    end
  when Interscript::Node::Item::CaptureGroup
    if target != :re
      raise Interscript::SystemConversionError, "Can't use a CaptureGroup in a #{target} context"
    end
    "(" + compile_item(i.data, doc, target) + ")"
  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 Maybe in a #{target} context"
    end
    if Interscript::Node::Item::String === i.data && i.data.data.length != 1
      "(?:" + compile_item(i.data, doc, target) + ")" + resuffix
    else
      compile_item(i.data, doc, target) + resuffix
    end
  when Interscript::Node::Item::CaptureRef
    if target == :par
      raise Interscript::SystemConversionError, "Can't use CaptureRef in parallel mode"
    elsif target == :re
      "\\#{i.id}"
    elsif target == :str
      "\"\\\\#{i.id}\""
    end
  when Interscript::Node::Item::Any
    if target == :str
      raise Interscript::SystemConversionError, "Can't use Any in a string context" # A linter could find this!
    elsif target == :par
      i.data.map(&:data)
    elsif target == :re
      case i.value
      when Array
        data = i.data.map { |j| compile_item(j, doc, target) }
        "(?:"+data.join("|")+")"
      when String
        "[#{Regexp.escape(i.value)}]"
      when Range
        "[#{Regexp.escape(i.value.first)}-#{Regexp.escape(i.value.last)}]"
      end
    end
  end
end

#compile_rule(r, map = @map, wrapper = false) ⇒ Object 



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# File 'lib/interscript/compiler/ruby.rb', line 43

def compile_rule(r, map = @map, wrapper = false)
  c = ""
  return c if r.reverse_run == true
  case r
  when Interscript::Node::Stage
    c += "Interscript::Maps.add_map_stage \"#{@map.name}\", #{r.name.inspect} do |s|\n"
    c += "$map_debug ||= []\n" if @debug
    c += "s = s.dup\n"
    r.children.each do |t|
      comp = compile_rule(t, map)
      c += comp
      c += %{$map_debug << [s.dup, #{@map.name.to_s.inspect}, #{r.name.to_s.inspect}, #{t.inspect.inspect}, #{comp.inspect}]\n} if @debug
    end
    c += "s\n"
    c += "end\n"
  when Interscript::Node::Group::Parallel
    begin
      # Try to build a tree
      a = []
      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
        a << [compile_item(i.from, map, :par), compile_item(i.to, map, :parstr)]
      end
      ah = a.hash.abs
      unless @parallel_trees.include? ah
        tree = Interscript::Stdlib.parallel_replace_compile_tree(a)
        @parallel_trees[ah] = tree
      end
      c += "s = Interscript::Stdlib.parallel_replace_tree(s, Interscript::Maps::Cache::PTREE_#{ah})\n"
    rescue
      # Otherwise let's build a megaregexp
      a = []
      Interscript::Stdlib.deterministic_sort_by_max_length(r.children).each do |i|
        raise Interscript::SystemConversionError, "Can't parallelize #{i.class}" unless Interscript::Node::Rule::Sub === i

        next if i.reverse_run == true
        a << [build_regexp(i, map), compile_item(i.to, map, :parstr)]
      end
      ah = a.hash.abs
      unless @parallel_regexps.include? ah
        re = Interscript::Stdlib.parallel_regexp_compile(a)
        @parallel_regexps[ah] = [re, a.map(&:last)]
      end
      c += "s = Interscript::Stdlib.parallel_regexp_gsub(s, *Interscript::Maps::Cache::PRE_#{ah})\n"
    end
  when Interscript::Node::Rule::Sub
    from = "/#{build_regexp(r, map).gsub("/", "\\\\/")}/"
    if r.to == :upcase
      to = '&:upcase'
    elsif r.to == :downcase
      to = '&:downcase'
    else
      to = compile_item(r.to, map, :str)
    end
    c += "s.gsub!(#{from}, #{to})\n"
  when Interscript::Node::Rule::Funcall
    c += "s = Interscript::Stdlib::Functions.#{r.name}(s, #{r.kwargs.inspect[1..-2]})\n"
  when Interscript::Node::Rule::Run
    if r.stage.map
      doc = map.dep_aliases[r.stage.map].document
      stage = doc.imported_stages[r.stage.name]
    else
      stage = map.imported_stages[r.stage.name]
    end
    c += "s = Interscript::Maps.transliterate(#{stage.doc_name.inspect}, s, #{stage.name.inspect})\n"
  else
    raise Interscript::SystemConversionError, "Can't compile unhandled #{r.class}"
  end
  c
end

#load ⇒ Object 



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# File 'lib/interscript/compiler/ruby.rb', line 243

def load
  if !defined?(Interscript::Maps) || !Interscript::Maps.has_map?(@map.name)
    @map.dependencies.each do |dep|
      dep = dep.full_name
      if !defined?(Interscript::Maps) || !Interscript::Maps.has_map?(dep)
        Interscript.load(dep, compiler: self.class).load
      end
    end
    eval(@code, $main_binding)
  end
end