text: #!/usr/bin/env python
  #
  # Copyright 2020 Google LLC
  #
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  import os
  import subprocess
  import sys
  import tempfile
  
  skslc = sys.argv[1]
  lang = sys.argv[2]
  settings = sys.argv[3]
  inputs = sys.argv[4:]
  
  def makeEmptyFile(path):
      try:
          open(path, 'wb').close()
      except OSError:
          pass
  
  def extensionForSpirvAsm(ext):
      return ext if (ext == '.frag' or ext == '.vert' or ext == '.geom') else '.frag'
  
  if settings != "--settings" and settings != "--nosettings":
      sys.exit("### Expected --settings or --nosettings, got " + settings)
  
  targets = []
  worklist = tempfile.NamedTemporaryFile(suffix='.worklist', delete=False)
  
  # Convert the list of command-line inputs into a worklist file sfor skslc.
  for input in inputs:
      noExt, ext = os.path.splitext(input)
      head, tail = os.path.split(noExt)
      targetDir = os.path.join(head, "golden")
      if not os.path.isdir(targetDir):
          os.mkdir(targetDir)
  
      target = os.path.join(targetDir, tail)
      if settings == "--nosettings":
          target += "StandaloneSettings"
  
      targets.append(target)
  
      if lang == "--fp":
          worklist.write(input + "\n")
          worklist.write(target + ".cpp\n")
          worklist.write(settings + "\n\n")
          worklist.write(input + "\n")
          worklist.write(target + ".h\n")
          worklist.write(settings + "\n\n")
      elif lang == "--glsl":
          worklist.write(input + "\n")
          worklist.write(target + ".glsl\n")
          worklist.write(settings + "\n\n")
      elif lang == "--metal":
          worklist.write(input + "\n")
          worklist.write(target + ".metal\n")
          worklist.write(settings + "\n\n")
      elif lang == "--spirv":
          worklist.write(input + "\n")
          worklist.write(target + ".asm" + extensionForSpirvAsm(ext) + "\n")
          worklist.write(settings + "\n\n")
      elif lang == "--skvm":
          worklist.write(input + "\n")
          worklist.write(target + ".skvm\n")
          worklist.write(settings + "\n\n")
      else:
          sys.exit("### Expected one of: --fp --glsl --metal --spirv --skvm, got " + lang)
  
  # Invoke skslc, passing in the worklist.
  worklist.close()
  try:
      output = subprocess.check_output([skslc, worklist.name], stderr=subprocess.STDOUT)
  except subprocess.CalledProcessError as err:
      if err.returncode != 1:
          print("### skslc error:\n")
          print("\n".join(err.output.splitlines()))
          sys.exit(err.returncode)
      pass  # Compile errors (exit code 1) are expected and normal in test code
  
  os.remove(worklist.name)
  
  # A special case cleanup pass, just for CPP and H files: if either one of these files starts with
  # `### Compilation failed`, its sibling should be replaced by an empty file. This improves clarity
  # during code review; a failure on either file means that success on the sibling is irrelevant.
  if lang == "--fp":
      for target in targets:
          cppFile = open(target + '.cpp', 'r')
          hFile = open(target + '.h', 'r')
          if cppFile.readline().startswith("### Compilation failed"):
              # The CPP had a compilation failure. Clear the header file.
              hFile.close()
              makeEmptyFile(target + '.h')
          elif hFile.readline().startswith("### Compilation failed"):
              # The header had a compilation failure. Clear the CPP file.
              cppFile.close()
              makeEmptyFile(target + '.cpp')
  