# File types supported for round trip.
# Other File types may be added easily.

class FileType
  include Singleton
  attr_reader :re_begin, :re_end
  @@types=Hash.new
  def initialize(type)
    #puts "type=#{type}"
    @@types[type]=self
  end
  def writeComment(str,writer)
    raise Warning.new(), 'Internal error. Undefined method'
  end
  def beginMarker(str,id)
    raise Warning.new(), 'Internal error. Undefined method'
  end

  #marker placeholder
  #(for use instead of normal marker when shorter file is requested)
  def beginMarkerSkip(str,id)
    return "\n"
  end
  def endMarker(str)
    raise Warning.new(), 'Internal error. Undefined method'
  end

  #marker placeholder
  #(for use instead of normal marker when shorter file is requested)
  def endMarkerSkip(str)
    return "\n"
  end
  def FileType.getFileType(fileName)
    ext=File.extname(fileName)
    type=@@types[ext]
    return type if ! type.nil?
    msg="Unknown File Type \"#{ext}\" for \"#{fileName}\""
    #log.debug(msg)
    raise WarningUnknownFileType.new(),msg
  end
  # escape text to be included in markers
  def escape(txt)
    return txt
  end
  #unescape text to be read from markers
  def unescape(txt)
    return txt
  end
end

class FileTypeJava < FileType
  include Singleton
  def initialize(ext='.java')
    super(ext)
    @re_begin=Regexp.new(/^[ \t]*\/\*[ _]*XMDA[ _]BEGIN[ _]+reverse="(.*)"[ _]uri="(.*)"[ _]*\*\//)
    @re_end=Regexp.new(/^[ \t]*\/\*[ _]*XMDA[ _]END[ _]+uri="(.*)"[ _]*\*\//)
  end
  def writeComment(str,writer)
    writer.write("/* #{str} */")
  end
  def thinLineComment
    #return context[:thinLineComment,true] ? ('_'*60) : ''
    #return "_____________________________________________________________________________________________________________________________________________"
    return ''
  end
  def beginMarker(uri,reverse)
    return %{\n/*XMDA_BEGIN_reverse="#{reverse ? 'yes':'no'}"_#{thinLineComment}uri="#{uri}"_*/\n}
  end
  def endMarker(uri)
    return %{\n/*XMDA_END_#{thinLineComment}uri="#{uri}"_*/\n}
  end
end
FileTypeJava.instance # register


class FileTypeXML < FileType
  # a character that can not exist in a URI
  URI_ESCAPE_CHAR_ONE='°'
  def initialize(ext='.xml')
    super(ext)
    @re_begin=/^[ \t]*<\!-- *XMDA BEGIN +reverse="([^"]*)" uri="([^"]*)" *-->/
    @re_end=/^[ \t]*<\!-- *XMDA END +uri="([^"]*)" *-->/
  end
  def writeComment(str,writer)
    writer.write("<!-- #{str} -->")
  end
  def beginMarker(uri,reverse)
    return %{\n<!-- XMDA BEGIN reverse="#{reverse ? 'yes':'no'}" uri="#{escape(uri)}" -->\n}
  end
  def endMarker(uri)
    return %{\n<!-- XMDA END   uri="#{escape(uri)}" -->\n}
  end
  def escape(txt)
    return txt.tr('-',URI_ESCAPE_CHAR_ONE)
  end
  def unescape(txt)
    return txt.tr(URI_ESCAPE_CHAR_ONE,'-')
  end
end
FileTypeXML.instance # register

class FileTypeXSD < FileTypeXML
  def initialize(ext='.xsd')
	  super
  end
end
FileTypeXSD.instance # register

class FileTypeJavaProperties < FileType
  def initialize(ext='.properties')
    super(ext)
    @re_begin=/^[ \t]*#[_ ]*XMDA_BEGIN_reverse="([^"]*)"_uri="([^"]*)"[ _]*$/
    @re_end=/^[ \t]*#[ _]*XMDA_END_uri="([^"]*)"[ _]*$/
  end
  def writeComment(str,writer)
    writer.write("#  #{str} ")
  end
  def beginMarker(uri,reverse)
    return %{\n#_XMDA_BEGIN_reverse="#{reverse ? 'yes':'no'}"_uri="#{uri}"\n}
  end
  def endMarker(uri)
    return %{\n#_XMDA_END_uri="#{uri}"\n}
  end
end
FileTypeJavaProperties.instance # register




class FileTypeJSP < FileType
  include Singleton
  def initialize(ext='.jsp')
    super(ext)
    @re_begin=Regexp.new(/^[ \t]*<%--*[ _]*XMDA[ _]BEGIN[ _]*reverse="(.*)"[ _]uri="(.*)"[ _]*--%>/)
    @re_end=Regexp.new(/^[ \t]*<%--[ _]*XMDA[ _]END[ _]*uri="(.*)"[ _]*--%>/)
  end
  def writeComment(str,writer)
    writer.write("<%-- #{str} --%>")
  end
  def thinLineComment
    #return context[:thinLineComment,true] ? ('_'*60) : ''
    #return "_____________________________________________________________________________________________________________________________________________"
    return ''
  end
  def beginMarker(uri,reverse)
    return %{\n<%--_XMDA_BEGIN_reverse="#{reverse ? 'yes':'no'}"_#{thinLineComment}uri="#{uri}"_--%>\n}
  end
  def endMarker(uri)
    return %{\n<%--_XMDA_END_#{thinLineComment}uri="#{uri}"_--%>\n}
  end
end
FileTypeJSP.instance # register