# vim: set et sw=3 tw=0 fo=awqorc ft=python:
# -*- mode:python; coding:utf-8; -*-
#
# Astxx, the Asterisk C++ API and Utility Library.
# Copyright © 2005, 2006  Matthew A. Nicholson
# Copyright © 2006  Tim Blechmann
#
#  Copyright © 2007 Christoph Boehme
#
#  Copyright © 2012 Dirk Baechle
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License version 2.1 as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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

# Currently supported output formats and their default
# values and output locations.
# From left to right:
#   1. default setting YES|NO
#   2. default output folder for this format
#   3. name of the (main) output file
#   4. default extension "
#   5. field for overriding the output file extension
output_formats = {
   "HTML": ("YES", "html", "index", ".html", "HTML_FILE_EXTENSION"),
   "LATEX": ("YES", "latex", "refman", ".tex", ""),
   "RTF": ("NO", "rtf", "refman", ".rtf", ""),
   "MAN": ("NO", "man", "", ".3", "MAN_EXTENSION"),
   "XML": ("NO", "xml", "index", ".xml", ""),
}

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
   token = lex.get_token()
   key = None
   last_token = ""
   key_token = True # the first token should be a key
   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 == "=":
            if key == "TAGFILES" and data.has_key(key):
               append_data( data, key, False, "=" )
               new_data=False
            else:
               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", "TAGFILES"]:
         continue

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

   return data

def DoxySourceFiles(node, env):
   """
   Scan the given node's contents (a 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)

   # We're running in the top-level directory, but the doxygen
   # configuration file is in the same directory as node; this means
   # that relative pathnames in node must be adjusted before they can
   # go onto the sources list
   conf_dir = os.path.dirname(str(node))

   input = data.get("INPUT")
   if input:
      for node in data.get("INPUT", []):
         if not os.path.isabs(node):
            node = os.path.join(conf_dir, node)
         if os.path.isfile(node):
            sources.append(node)
         elif os.path.isdir(node):
            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)
            else:
               for pattern in file_patterns:
                  sources.extend(glob.glob("/".join([node, pattern])))
   else:
      # No INPUT specified, so apply plain patterns only
      if recursive:
         for root, dirs, files in os.walk('.'):
            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)
      else:
         for pattern in file_patterns:
            sources.extend(glob.glob(pattern))

   # Add tagfiles to the list of source files:
   for node in data.get("TAGFILES", []):
      file = node.split("=")[0]
      if not os.path.isabs(file):
         file = os.path.join(conf_dir, file)
      sources.append(file)

   # Add additional files to the list of source files:
   def append_additional_source(option, formats):
      for f in formats:
         if data.get('GENERATE_'+f, output_formats[f][0]) == "YES":
            file = data.get(option, "")
            if file != "":
               if not os.path.isabs(file):
                  file = os.path.join(conf_dir, file)
               if os.path.isfile(file):
                  sources.append(file)
            break;

   append_additional_source("HTML_STYLESHEET",['HTML'])
   append_additional_source("HTML_HEADER",['HTML'])
   append_additional_source("HTML_FOOTER",['HTML'])

   return sources

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.
   """
   filepaths = DoxySourceFiles(node, env)
   sources = map( lambda path: env.File(path), filepaths )
   return sources

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

def DoxyEmitter(target, source, env):
   """Doxygen Doxyfile emitter"""
   doxy_fpath = str(source[0])
   data = DoxyfileParse(source[0].get_contents())

   targets = []
   out_dir = data.get("OUTPUT_DIRECTORY", ".")
   if not os.path.isabs(out_dir):
      conf_dir = os.path.dirname(doxy_fpath)
      out_dir = os.path.join(conf_dir, out_dir)

   # add our output locations
   for (k, v) in output_formats.items():
      if data.get("GENERATE_" + k, v[0]) == "YES":
         # Initialize output file extension for MAN pages
         if k == 'MAN':
            # Is the given extension valid?
            manext = v[3]
            if v[4]:
               manext = data.get(v[4])
            # Try to strip off dots
            manext = manext.replace('.','')
            # Can we convert it to an int?
            try:
               e = int(manext)
            except:
               # No, so set back to default
               manext = "3"

            od = env.Dir( os.path.join(out_dir, data.get(k + "_OUTPUT", v[1]), "man"+manext))
         else:
            od = env.Dir( os.path.join(out_dir, data.get(k + "_OUTPUT", v[1])))
         # don't clobber target folders
         env.Precious(od)
         # set up cleaning stuff
         env.Clean(od, od)

         # Add target files
         if k != "MAN":
            # Is an extension override var given?
            if v[4]:
               fname = v[2]+data.get(v[4])
            else:
               fname = v[2]+v[3]
            of = env.File(os.path.join(out_dir, data.get(k + "_OUTPUT", v[1]), fname))
            targets.append(of)
            # don't clean single files, we remove the complete output folders (see above)
            env.NoClean(of)
         else:
            # Special case: MAN pages
            # We have to add a target file docs/man/man3/foo.h.3
            # for each input file foo.h, so we scan the config file
            # a second time... :(
            filepaths = DoxySourceFiles(source[0], env)
            for f in filepaths:
               if os.path.isfile(f) and f != doxy_fpath:
                  of = env.File( os.path.join(out_dir,
                                              data.get(k + "_OUTPUT", v[1]),
                                              "man"+manext,
                                              f+"."+manext))
                  targets.append(of)
                  # don't clean single files, we remove the complete output folders (see above)
                  env.NoClean(of)

   # add the tag file if neccessary:
   tagfile = data.get("GENERATE_TAGFILE", "")
   if tagfile != "":
      if not os.path.isabs(tagfile):
         conf_dir = os.path.dirname(str(source[0]))
         tagfile = os.path.join(conf_dir, tagfile)
      targets.append(env.File(tagfile))

   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,
   )

   import SCons.Builder
   doxyfile_builder = SCons.Builder.Builder(
      action = "cd ${SOURCE.dir}  &&  ${DOXYGEN} ${SOURCE.file}",
      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")