# ---------------------- Changed for JRuby ------------------------------------
# off by default
if ENV_JAVA['jruby.cext.enabled'] == 'true'
  msg = "JRuby does not support native extensions or the `mkmf' library very well.\n" +
        "Check https://wiki.jruby.org/C-Extension-Alternatives for alternatives.\n"
else
  msg = "C extension support is not enabled. Pass -Xcext.enabled=true to JRuby or set JRUBY_OPTS.\n"
  raise NotImplementedError, msg
end

require 'rbconfig'

# We're missing this in our rbconfig
module Config
  def RbConfig::expand(val, config = CONFIG)
    val.gsub!(/\$\$|\$\(([^()]+)\)|\$\{([^{}]+)\}/) do |var|
      if !(v = $1 || $2)
        '$'
      elsif key = config[v = v[/\A[^:]+(?=(?::(.*?)=(.*))?\z)/]]
        pat, sub = $1, $2
        config[v] = false
        RbConfig::expand(key, config)
        config[v] = key
        key = key.gsub(/#{Regexp.quote(pat)}(?=\s|\z)/n) {sub} if pat
        key
      else
        " "
      end
    end
    val
  end
end

# Some extconf.rb's rely on RUBY_PLATFORM to point to the native platform
Object.send(:remove_const, :RUBY_PLATFORM)
RUBY_PLATFORM = RbConfig::MAKEFILE_CONFIG['RUBY_PLATFORM']

# JRuby's RbConfig::CONFIG and MAKEFILE_CONFIG are each not complete.
RbConfig::CONFIG.merge!(RbConfig::MAKEFILE_CONFIG)
RbConfig::MAKEFILE_CONFIG.merge!(RbConfig::CONFIG)

# For environment overrides to work, the MAKEFILE_CONFIG hash needs to have these
RbConfig::MAKEFILE_CONFIG["CFLAGS"] += " $(cflags)"
RbConfig::MAKEFILE_CONFIG["CPPFLAGS"] += " $(DEFS) $(cppflags)"
RbConfig::MAKEFILE_CONFIG["CXXFLAGS"] += " $(cflags) $(cxxflags)"

$topdir     = RbConfig::MAKEFILE_CONFIG['includedir']
$hdrdir     = File.join($topdir, "ruby")
$top_srcdir = $topdir
$extmk      = false

# Make sure the headers are extracted into the file-system
unless File.exists?($hdrdir + "/ruby.h")
  abort "mkmf.rb can't find header files for ruby at #{$hdrdir}/ruby.h"
end
# -----------------------------------------------------------------------------


# module to create Makefile for extension modules
# invoke like: ruby -r mkmf extconf.rb

require 'rbconfig'
require 'fileutils'
require 'shellwords'

CONFIG = RbConfig::MAKEFILE_CONFIG
ORIG_LIBPATH = ENV['LIB']

CXX_EXT = %w[cc cxx cpp]
if /mswin|bccwin|mingw|msdosdjgpp|human|os2/ !~ CONFIG['build_os']
  CXX_EXT.concat(%w[C])
end
SRC_EXT = %w[c m].concat(CXX_EXT)
$static = $config_h = nil
$default_static = $static

unless defined? $configure_args
  $configure_args = {}
  args = CONFIG["configure_args"]
  if ENV["CONFIGURE_ARGS"]
    args << " " << ENV["CONFIGURE_ARGS"]
  end
  for arg in Shellwords::shellwords(args)
    arg, val = arg.split('=', 2)
    next unless arg
    arg.tr!('_', '-')
    if arg.sub!(/^(?!--)/, '--')
      val or next
      arg.downcase!
    end
    next if /^--(?:top|topsrc|src|cur)dir$/ =~ arg
    $configure_args[arg] = val || true
  end
  for arg in ARGV
    arg, val = arg.split('=', 2)
    next unless arg
    arg.tr!('_', '-')
    if arg.sub!(/^(?!--)/, '--')
      val or next
      arg.downcase!
    end
    $configure_args[arg] = val || true
  end
end

$libdir = CONFIG["libdir"]
$rubylibdir = CONFIG["rubylibdir"]
$archdir = CONFIG["archdir"]
$sitedir = CONFIG["sitedir"]
$sitelibdir = CONFIG["sitelibdir"]
$sitearchdir = CONFIG["sitearchdir"]
$vendordir = CONFIG["vendordir"]
$vendorlibdir = CONFIG["vendorlibdir"]
$vendorarchdir = CONFIG["vendorarchdir"]

$mswin = /mswin/ =~ RUBY_PLATFORM
$bccwin = /bccwin/ =~ RUBY_PLATFORM
$mingw = /mingw/ =~ RUBY_PLATFORM
$cygwin = /cygwin/ =~ RUBY_PLATFORM
$human = /human/ =~ RUBY_PLATFORM
$netbsd = /netbsd/ =~ RUBY_PLATFORM
$os2 = /os2/ =~ RUBY_PLATFORM
$beos = /beos/ =~ RUBY_PLATFORM
$solaris = /solaris/ =~ RUBY_PLATFORM
$dest_prefix_pattern = (File::PATH_SEPARATOR == ';' ? /\A([[:alpha:]]:)?/ : /\A/)

# :stopdoc:

def config_string(key, config = CONFIG)
  s = config[key] and !s.empty? and block_given? ? yield(s) : s
end

def dir_re(dir)
  Regexp.new('\$(?:\('+dir+'\)|\{'+dir+'\})(?:\$(?:\(target_prefix\)|\{target_prefix\}))?')
end

INSTALL_DIRS = [
  [dir_re('commondir'), "$(RUBYCOMMONDIR)"],
  [dir_re('sitedir'), "$(RUBYCOMMONDIR)"],
  [dir_re('vendordir'), "$(RUBYCOMMONDIR)"],
  [dir_re('rubylibdir'), "$(RUBYLIBDIR)"],
  [dir_re('archdir'), "$(RUBYARCHDIR)"],
  [dir_re('sitelibdir'), "$(RUBYLIBDIR)"],
  [dir_re('vendorlibdir'), "$(RUBYLIBDIR)"],
  [dir_re('sitearchdir'), "$(RUBYARCHDIR)"],
  [dir_re('bindir'), "$(BINDIR)"],
  [dir_re('vendorarchdir'), "$(RUBYARCHDIR)"],
]

def install_dirs(target_prefix = nil)
  if $extout
    dirs = [
      ['BINDIR',        '$(extout)/bin'],
      ['RUBYCOMMONDIR', '$(extout)/common'],
      ['RUBYLIBDIR',    '$(RUBYCOMMONDIR)$(target_prefix)'],
      ['RUBYARCHDIR',   '$(extout)/$(arch)$(target_prefix)'],
      ['extout',        "#$extout"],
      ['extout_prefix', "#$extout_prefix"],
    ]
  elsif $extmk
    dirs = [
      ['BINDIR',        '$(bindir)'],
      ['RUBYCOMMONDIR', '$(rubylibdir)'],
      ['RUBYLIBDIR',    '$(rubylibdir)$(target_prefix)'],
      ['RUBYARCHDIR',   '$(archdir)$(target_prefix)'],
    ]
  elsif $configure_args.has_key?('--vendor')
    dirs = [
      ['BINDIR',        '$(bindir)'],
      ['RUBYCOMMONDIR', '$(vendordir)$(target_prefix)'],
      ['RUBYLIBDIR',    '$(vendorlibdir)$(target_prefix)'],
      ['RUBYARCHDIR',   '$(vendorarchdir)$(target_prefix)'],
    ]
  else
    dirs = [
      ['BINDIR',        '$(bindir)'],
      ['RUBYCOMMONDIR', '$(sitedir)$(target_prefix)'],
      ['RUBYLIBDIR',    '$(sitelibdir)$(target_prefix)'],
      ['RUBYARCHDIR',   '$(sitearchdir)$(target_prefix)'],
    ]
  end
  dirs << ['target_prefix', (target_prefix ? "/#{target_prefix}" : "")]
  dirs
end

def map_dir(dir, map = nil)
  map ||= INSTALL_DIRS
  map.inject(dir) {|dir, (orig, new)| dir.gsub(orig, new)}
end

OUTFLAG = CONFIG['OUTFLAG']
CPPOUTFILE = CONFIG['CPPOUTFILE']

CONFTEST_C = "conftest.c"

class String
  # Wraps a string in escaped quotes if it contains whitespace.
  def quote
    /\s/ =~ self ? "\"#{self}\"" : "#{self}"
  end

  # Generates a string used as cpp macro name.
  def tr_cpp
    strip.upcase.tr_s("^A-Z0-9_", "_")
  end
end
class Array
  # Wraps all strings in escaped quotes if they contain whitespace.
  def quote
    map {|s| s.quote}
  end
end

def rm_f(*files)
  FileUtils.rm_f(Dir[files.join("\0")])
end

# Returns time stamp of the +target+ file if it exists and is newer
# than or equal to all of +times+.
def modified?(target, times)
  (t = File.mtime(target)) rescue return nil
  Array === times or times = [times]
  t if times.all? {|n| n <= t}
end

def merge_libs(*libs)
  libs.inject([]) do |x, y|
    xy = x & y
    xn = yn = 0
    y = y.inject([]) {|ary, e| ary.last == e ? ary : ary << e}
    y.each_with_index do |v, yi|
      if xy.include?(v)
        xi = [x.index(v), xn].max()
        x[xi, 1] = y[yn..yi]
        xn, yn = xi + (yi - yn + 1), yi + 1
      end
    end
    x.concat(y[yn..-1] || [])
  end
end

# This is a custom logging module. It generates an mkmf.log file when you
# run your extconf.rb script. This can be useful for debugging unexpected
# failures.
#
# This module and its associated methods are meant for internal use only.
#
module Logging
  @log = nil
  @logfile = 'mkmf.log'
  @orgerr = $stderr.dup
  @orgout = $stdout.dup
  @postpone = 0
  @quiet = $extmk

  def self::log_open
    @log = nil if !@log.nil? && @log.closed? # HACK
    @log ||= File::open(@logfile, 'ab')      # @log ends up with .closed?==true all the time
    @log.sync = true
  end

  def self::open
    log_open
    $stderr.reopen(@log)
    $stdout.reopen(@log)
    yield
  ensure
    $stderr.reopen(@orgerr)
    $stdout.reopen(@orgout)
  end

  def self::message(*s)
    log_open
    @log.printf(*s)
  end

  def self::logfile file
    @logfile = file
    if @log and not @log.closed?
      @log.flush
      @log.close
      @log = nil
    end
  end

  def self::postpone
    tmplog = "mkmftmp#{@postpone += 1}.log"
    open do
      log, *save = @log, @logfile, @orgout, @orgerr
      @log, @logfile, @orgout, @orgerr = nil, tmplog, log, log
      begin
        log.print(open {yield})
      ensure
        @log.close
        File::open(tmplog) {|t| FileUtils.copy_stream(t, log)}
        @log, @logfile, @orgout, @orgerr = log, *save
        @postpone -= 1
        rm_f tmplog
      end
    end
  end

  class << self
    attr_accessor :quiet
  end
end

def xsystem command
  varpat = /\$\((\w+)\)|\$\{(\w+)\}/
  if varpat =~ command
    vars = Hash.new {|h, k| h[k] = ''; ENV[k]}
    command = command.dup
    nil while command.gsub!(varpat) {vars[$1||$2]}
  end
  Logging::open do
    puts command.quote
    system(command)
  end
end

def xpopen command, *mode, &block
  Logging::open do
    case mode[0]
    when nil, /^r/
      puts "#{command} |"
    else
      puts "| #{command}"
    end
    IO.popen(command, *mode, &block)
  end
end

def log_src(src)
  src = src.split(/^/)
  fmt = "%#{src.size.to_s.size}d: %s"
  Logging::message <<"EOM"
checked program was:
/* begin */
EOM
  src.each_with_index {|line, no| Logging::message fmt, no+1, line}
  Logging::message <<"EOM"
/* end */

EOM
end