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require 'rexml/parsers/sax2parser'
require 'rexml/sax2listener'
require 'ant'
class Ant
class ProjectConverter
include REXML::SAX2Listener
def initialize
@output = $stdout
@depth = 0
@seen = ['<DOC>', 0]
end
def start_element(uri, localname, qname, attributes)
emit_do(localname)
case localname
when "project"
@output.puts "require 'ant'"
emit "ant", attributes
when "description"
print_with_indent "project.description = "
else
emit localname, attributes
end
@depth += 1
end
def end_element(uri, localname, qname)
@depth -= 1
emit_end(localname)
end
def characters(text)
@output.print value_inspect(text.strip) if text.strip.length > 0
end
def emit_do(tag)
@output.puts " do" if @seen.last[1] != @depth
@seen << [tag, @depth]
end
def emit_end(tag)
level = @seen.last
if level[0] == tag && level[1] == @depth
@output.puts
else
print_with_indent "end\n"
@seen << ["/#{tag}", @depth]
end
end
def emit(code, attributes = nil)
print_with_indent safe_method_name(code, attributes)
if attributes
first = true
attributes.each do |k,v|
@output.print "," unless first
@output.print " #{symbol_or_string(k)} => #{value_inspect(v)}"
first = false
end
end
end
def print_with_indent(str)
@output.print " " * @depth
@output.print str
end
ID = /\A[a-zA-Z_][a-zA-Z0-9_]*\z/
def symbol_or_string(s)
if s =~ ID
":#{s}"
else
s.inspect
end
end
def value_inspect(s)
s.inspect.gsub("\\n", "\n")
end
def safe_method_name(s, attributes)
s = Ant.safe_method_name(s)
if s =~ ID
s
else
"_element #{s.inspect}#{attributes.nil? || attributes.empty? ? '' : ','}"
end
end
def self.convert(file = "build.xml")
source = File.exists?(file) ? File.new(file) : $stdin
parser = REXML::Parsers::SAX2Parser.new source
parser.listen self.new
parser.parse
end
end
end
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