# Big issue:
# emitter depends on doxyfile which is generated from doxyfile.in.
# build fails after cleaning and relaunching the build.

import os
import os.path
import glob
from fnmatch import fnmatch

def DoxyfileParse(file_contents):
   """
   Parse a Doxygen source file and return a dictionary of all the values.
   Values will be strings and lists of strings.
   """
   data = {}

   import shlex
   lex = shlex.shlex(instream = file_contents, posix = True)
   lex.wordchars += "*+./-:"
   lex.whitespace = lex.whitespace.replace("\n", "")
   lex.escape = ""

   lineno = lex.lineno
   last_backslash_lineno = lineno
   token = lex.get_token()
   key = token   # the first token should be a key
   last_token = ""
   key_token = False
   next_key = False
   new_data = True

   def append_data(data, key, new_data, token):
      if new_data or len(data[key]) == 0:
         data[key].append(token)
      else:
         data[key][-1] += token

   while token:
      if token in ['\n']:
         if last_token not in ['\\']:
            key_token = True
      elif token in ['\\']:
         pass
      elif key_token:
         key = token
         key_token = False
      else:
         if token == "+=":
            if not data.has_key(key):
               data[key] = list()
         elif token == "=":
            data[key] = list()
         else:
            append_data( data, key, new_data, token )
            new_data = True

      last_token = token
      token = lex.get_token()
      
      if last_token == '\\' and token != '\n':
         new_data = False
         append_data( data, key, new_data, '\\' )

   # compress lists of len 1 into single strings
   for (k, v) in data.items():
      if len(v) == 0:
         data.pop(k)

      # items in the following list will be kept as lists and not converted to strings
      if k in ["INPUT", "FILE_PATTERNS", "EXCLUDE_PATTERNS"]:
         continue

      if len(v) == 1:
         data[k] = v[0]

   return data

def DoxySourceScan(node, env, path):
   """
   Doxygen Doxyfile source scanner.  This should scan the Doxygen file and add
   any files used to generate docs to the list of source files.
   """
   default_file_patterns = [
      '*.c', '*.cc', '*.cxx', '*.cpp', '*.c++', '*.java', '*.ii', '*.ixx',
      '*.ipp', '*.i++', '*.inl', '*.h', '*.hh ', '*.hxx', '*.hpp', '*.h++',
      '*.idl', '*.odl', '*.cs', '*.php', '*.php3', '*.inc', '*.m', '*.mm',
      '*.py',
   ]

   default_exclude_patterns = [
      '*~',
   ]

   sources = []

   data = DoxyfileParse(node.get_contents())

   if data.get("RECURSIVE", "NO") == "YES":
      recursive = True
   else:
      recursive = False

   file_patterns = data.get("FILE_PATTERNS", default_file_patterns)
   exclude_patterns = data.get("EXCLUDE_PATTERNS", default_exclude_patterns)

   doxyfile_dir = str( node.dir )

##   print 'running from', os.getcwd()
   for node in data.get("INPUT", []):
      node_real_path = os.path.normpath( os.path.join( doxyfile_dir, node ) )
      if os.path.isfile(node_real_path):
##         print str(node), 'is a file'
         sources.append(node)
      elif os.path.isdir(node_real_path):
##         print str(node), 'is a directory'
         if recursive:
            for root, dirs, files in os.walk(node):
               for f in files:
                  filename = os.path.join(root, f)

                  pattern_check = reduce(lambda x, y: x or bool(fnmatch(filename, y)), file_patterns, False)
                  exclude_check = reduce(lambda x, y: x and fnmatch(filename, y), exclude_patterns, True)

                  if pattern_check and not exclude_check:
                     sources.append(filename)
##                     print '  adding source', os.path.abspath( filename )
         else:
            for pattern in file_patterns:
               sources.extend(glob.glob(os.path.join( node, pattern)))
##      else:
##         print str(node), 'is neither a file nor a directory'
   sources = map( lambda path: env.File(path), sources )
   return sources


def DoxySourceScanCheck(node, env):
   """Check if we should scan this file"""
   return os.path.isfile(node.path)

def DoxyEmitter(source, target, env):
   """Doxygen Doxyfile emitter"""
   # possible output formats and their default values and output locations
   output_formats = {
      "HTML": ("YES", "html"),
      "LATEX": ("YES", "latex"),
      "RTF": ("NO", "rtf"),
      "MAN": ("YES", "man"),
      "XML": ("NO", "xml"),
   }

##   print '#### DoxyEmitter:', source[0].abspath, os.path.exists( source[0].abspath )
   data = DoxyfileParse(source[0].get_contents())

   targets = []
   out_dir = data.get("OUTPUT_DIRECTORY", ".")

   # add our output locations
   for (k, v) in output_formats.items():
      if data.get("GENERATE_" + k, v[0]) == "YES":
         targets.append(env.Dir( os.path.join(out_dir, data.get(k + "_OUTPUT", v[1]))) )

   # don't clobber targets
   for node in targets:
      env.Precious(node)

   # set up cleaning stuff
   for node in targets:
      clean_cmd = env.Clean(node, node)
      env.Depends( clean_cmd, source )

   return (targets, source)

def generate(env):
   """
   Add builders and construction variables for the
   Doxygen tool.  This is currently for Doxygen 1.4.6.
   """
   doxyfile_scanner = env.Scanner(
      DoxySourceScan,
      "DoxySourceScan",
      scan_check = DoxySourceScanCheck,
   )

   doxyfile_builder = env.Builder(
      action = env.Action("cd ${SOURCE.dir}  &&  ${DOXYGEN} ${SOURCE.file}",
                          varlist=['$SOURCES']),
      emitter = DoxyEmitter,
      target_factory = env.fs.Entry,
      single_source = True,
      source_scanner =  doxyfile_scanner,
   )

   env.Append(BUILDERS = {
      'Doxygen': doxyfile_builder,
   })

   env.AppendUnique(
      DOXYGEN = 'doxygen',
   )

def exists(env):
   """
   Make sure doxygen exists.
   """
   return env.Detect("doxygen")