# 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
	def endMarker(str,id)
		raise Warning.new(), "Internal error. Undefined method" 
	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 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