waf/waflib/Tools/qt4.py

#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2006-2010 (ita)

"""

Tool Description
================

This tool helps with finding Qt4 tools and libraries,
and also provides syntactic sugar for using Qt4 tools.

The following snippet illustrates the tool usage::

	def options(opt):
		opt.load('compiler_cxx qt4')

	def configure(conf):
		conf.load('compiler_cxx qt4')

	def build(bld):
		bld(
			features = 'qt4 cxx cxxprogram',
			uselib   = 'QTCORE QTGUI QTOPENGL QTSVG',
			source   = 'main.cpp textures.qrc aboutDialog.ui',
			target   = 'window',
		)

Here, the UI description and resource files will be processed
to generate code.

Usage
=====

Load the "qt4" tool.

You also need to edit your sources accordingly:

- the normal way of doing things is to have your C++ files
  include the .moc file.
  This is regarded as the best practice (and provides much faster
  compilations).
  It also implies that the include paths have beenset properly.

- to have the include paths added automatically, use the following::

     from waflib.TaskGen import feature, before_method, after_method
     @feature('cxx')
     @after_method('process_source')
     @before_method('apply_incpaths')
     def add_includes_paths(self):
        incs = set(self.to_list(getattr(self, 'includes', '')))
        for x in self.compiled_tasks:
            incs.add(x.inputs[0].parent.path_from(self.path))
        self.includes = list(incs)

Note: another tool provides Qt processing that does not require
.moc includes, see ``playground/slow_qt/``self.

A few options (--qt{dir,bin,...}) and environment variables
(QT4_{ROOT,DIR,MOC,UIC,XCOMPILE}) allow finer tuning of the tool,
tool path selection, etc; please read the source for more info.

"""

try:
	from xml.sax import make_parser
	from xml.sax.handler import ContentHandler
except ImportError:
	has_xml = False
	ContentHandler = object
else:
	has_xml = True

import os, sys
from waflib.Tools import c_preproc, cxx
from waflib import Task, Utils, Options, Errors
from waflib.TaskGen import feature, after_method, extension
from waflib.Configure import conf
from waflib import Logs

MOC_H = ['.h', '.hpp', '.hxx', '.hh']
"""
File extensions associated to the .moc files
"""

EXT_RCC = ['.qrc']
"""
File extension for the resource (.qrc) files
"""

EXT_UI  = ['.ui']
"""
File extension for the user interface (.ui) files
"""

EXT_QT4 = ['.cpp', '.cc', '.cxx', '.C']
"""
File extensions of C++ files that may require a .moc processing
"""

QT4_LIBS = "QtCore QtGui QtUiTools QtNetwork QtOpenGL QtSql QtSvg QtTest QtXml QtXmlPatterns QtWebKit Qt3Support QtHelp QtScript QtDeclarative"

class qxx(Task.classes['cxx']):
	"""
	Each C++ file can have zero or several .moc files to create.
	They are known only when the files are scanned (preprocessor)
	To avoid scanning the c++ files each time (parsing C/C++), the results
	are retrieved from the task cache (bld.node_deps/bld.raw_deps).
	The moc tasks are also created *dynamically* during the build.
	"""

	def __init__(self, *k, **kw):
		Task.Task.__init__(self, *k, **kw)
		self.moc_done = 0

	def scan(self):
		"""Re-use the C/C++ scanner, but remove the moc files from the dependencies"""
		(nodes, names) = c_preproc.scan(self)
		# for some reasons (variants) the moc node may end in the list of node deps
		for x in nodes:
			if x.name.endswith('.moc'):
				nodes.remove(x)
				names.append(x.path_from(self.inputs[0].parent.get_bld()))
		return (nodes, names)

	def runnable_status(self):
		"""
		Compute the task signature to make sure the scanner was executed. Create the
		moc tasks by using :py:meth:`waflib.Tools.qt4.qxx.add_moc_tasks` (if necessary),
		then postpone the task execution (there is no need to recompute the task signature).
		"""
		if self.moc_done:
			return Task.Task.runnable_status(self)
		else:
			for t in self.run_after:
				if not t.hasrun:
					return Task.ASK_LATER
			self.add_moc_tasks()
			return Task.Task.runnable_status(self)

	def add_moc_tasks(self):
		"""
		Create the moc tasks by looking in ``bld.raw_deps[self.uid()]``
		"""
		node = self.inputs[0]
		bld = self.generator.bld

		try:
			# compute the signature once to know if there is a moc file to create
			self.signature()
		except KeyError:
			# the moc file may be referenced somewhere else
			pass
		else:
			# remove the signature, it must be recomputed with the moc task
			delattr(self, 'cache_sig')

		moctasks=[]
		mocfiles=[]
		try:
			tmp_lst = bld.raw_deps[self.uid()]
			bld.raw_deps[self.uid()] = []
		except KeyError:
			tmp_lst = []
		for d in tmp_lst:
			if not d.endswith('.moc'):
				continue
			# paranoid check
			if d in mocfiles:
				Logs.error("paranoia owns")
				continue
			# process that base.moc only once
			mocfiles.append(d)

			# find the extension - this search is done only once

			h_node = None
			try: ext = Options.options.qt_header_ext.split()
			except AttributeError: pass
			if not ext: ext = MOC_H

			base2 = d[:-4]
			for x in [node.parent] + self.generator.includes_nodes:
				for e in ext:
					h_node = x.find_node(base2 + e)
					if h_node:
						break
				if h_node:
					m_node = h_node.change_ext('.moc')
					break
			else:
				for k in EXT_QT4:
					if base2.endswith(k):
						for x in [node.parent] + self.generator.includes_nodes:
							h_node = x.find_node(base2)
							if h_node:
								break
					if h_node:
						m_node = h_node.change_ext(k + '.moc')
						break
			if not h_node:
				raise Errors.WafError('no header found for %r which is a moc file' % d)

			# next time we will not search for the extension (look at the 'for' loop below)
			bld.node_deps[(self.inputs[0].parent.abspath(), m_node.name)] = h_node

			# create the task
			task = Task.classes['moc'](env=self.env, generator=self.generator)
			task.set_inputs(h_node)
			task.set_outputs(m_node)

			# direct injection in the build phase (safe because called from the main thread)
			gen = bld.producer
			gen.outstanding.insert(0, task)
			gen.total += 1

			moctasks.append(task)

		# remove raw deps except the moc files to save space (optimization)
		tmp_lst = bld.raw_deps[self.uid()] = mocfiles

		# look at the file inputs, it is set right above
		lst = bld.node_deps.get(self.uid(), ())
		for d in lst:
			name = d.name
			if name.endswith('.moc'):
				task = Task.classes['moc'](env=self.env, generator=self.generator)
				task.set_inputs(bld.node_deps[(self.inputs[0].parent.abspath(), name)]) # 1st element in a tuple
				task.set_outputs(d)

				gen = bld.producer
				gen.outstanding.insert(0, task)
				gen.total += 1

				moctasks.append(task)

		# simple scheduler dependency: run the moc task before others
		self.run_after.update(set(moctasks))
		self.moc_done = 1

	run = Task.classes['cxx'].__dict__['run']

class trans_update(Task.Task):
	"""Update a .ts files from a list of C++ files"""
	run_str = '${QT_LUPDATE} ${SRC} -ts ${TGT}'
	color   = 'BLUE'
Task.update_outputs(trans_update)

class XMLHandler(ContentHandler):
	"""
	Parser for *.qrc* files
	"""
	def __init__(self):
		self.buf = []
		self.files = []
	def startElement(self, name, attrs):
		if name == 'file':
			self.buf = []
	def endElement(self, name):
		if name == 'file':
			self.files.append(str(''.join(self.buf)))
	def characters(self, cars):
		self.buf.append(cars)

@extension(*EXT_RCC)
def create_rcc_task(self, node):
	"Create rcc and cxx tasks for *.qrc* files"
	rcnode = node.change_ext('_rc.cpp')
	rcctask = self.create_task('rcc', node, rcnode)
	cpptask = self.create_task('cxx', rcnode, rcnode.change_ext('.o'))
	try:
		self.compiled_tasks.append(cpptask)
	except AttributeError:
		self.compiled_tasks = [cpptask]
	return cpptask

@extension(*EXT_UI)
def create_uic_task(self, node):
	"hook for uic tasks"
	uictask = self.create_task('ui4', node)
	uictask.outputs = [self.path.find_or_declare(self.env['ui_PATTERN'] % node.name[:-3])]

@extension('.ts')
def add_lang(self, node):
	"""add all the .ts file into self.lang"""
	self.lang = self.to_list(getattr(self, 'lang', [])) + [node]

@feature('qt4')
@after_method('apply_link')
def apply_qt4(self):
	"""
	Add MOC_FLAGS which may be necessary for moc::

		def build(bld):
			bld.program(features='qt4', source='main.cpp', target='app', use='QTCORE')

	The additional parameters are:

	:param lang: list of translation files (\*.ts) to process
	:type lang: list of :py:class:`waflib.Node.Node` or string without the .ts extension
	:param update: whether to process the C++ files to update the \*.ts files (use **waf --translate**)
	:type update: bool
	:param langname: if given, transform the \*.ts files into a .qrc files to include in the binary file
	:type langname: :py:class:`waflib.Node.Node` or string without the .qrc extension
	"""
	if getattr(self, 'lang', None):
		qmtasks = []
		for x in self.to_list(self.lang):
			if isinstance(x, str):
				x = self.path.find_resource(x + '.ts')
			qmtasks.append(self.create_task('ts2qm', x, x.change_ext('.qm')))

		if getattr(self, 'update', None) and Options.options.trans_qt4:
			cxxnodes = [a.inputs[0] for a in self.compiled_tasks] + [
				a.inputs[0] for a in self.tasks if getattr(a, 'inputs', None) and a.inputs[0].name.endswith('.ui')]
			for x in qmtasks:
				self.create_task('trans_update', cxxnodes, x.inputs)

		if getattr(self, 'langname', None):
			qmnodes = [x.outputs[0] for x in qmtasks]
			rcnode = self.langname
			if isinstance(rcnode, str):
				rcnode = self.path.find_or_declare(rcnode + '.qrc')
			t = self.create_task('qm2rcc', qmnodes, rcnode)
			k = create_rcc_task(self, t.outputs[0])
			self.link_task.inputs.append(k.outputs[0])

	lst = []
	for flag in self.to_list(self.env['CXXFLAGS']):
		if len(flag) < 2: continue
		f = flag[0:2]
		if f in ['-D', '-I', '/D', '/I']:
			if (f[0] == '/'):
				lst.append('-' + flag[1:])
			else:
				lst.append(flag)
	self.env['MOC_FLAGS'] = lst

@extension(*EXT_QT4)
def cxx_hook(self, node):
	"""
	Re-map C++ file extensions to the :py:class:`waflib.Tools.qt4.qxx` task.
	"""
	return self.create_compiled_task('qxx', node)

class rcc(Task.Task):
	"""
	Process *.qrc* files
	"""
	color   = 'BLUE'
	run_str = '${QT_RCC} -name ${SRC[0].name} ${SRC[0].abspath()} ${RCC_ST} -o ${TGT}'
	ext_out = ['.h']

	def scan(self):
		"""Parse the *.qrc* files"""
		node = self.inputs[0]

		if not has_xml:
			Logs.error('no xml support was found, the rcc dependencies will be incomplete!')
			return ([], [])

		parser = make_parser()
		curHandler = XMLHandler()
		parser.setContentHandler(curHandler)
		fi = open(self.inputs[0].abspath(), 'r')
		try:
			parser.parse(fi)
		finally:
			fi.close()

		nodes = []
		names = []
		root = self.inputs[0].parent
		for x in curHandler.files:
			nd = root.find_resource(x)
			if nd: nodes.append(nd)
			else: names.append(x)
		return (nodes, names)

class moc(Task.Task):
	"""
	Create *.moc* files
	"""
	color   = 'BLUE'
	run_str = '${QT_MOC} ${MOC_FLAGS} ${MOCCPPPATH_ST:INCPATHS} ${MOCDEFINES_ST:DEFINES} ${SRC} ${MOC_ST} ${TGT}'

class ui4(Task.Task):
	"""
	Process *.ui* files
	"""
	color   = 'BLUE'
	run_str = '${QT_UIC} ${SRC} -o ${TGT}'
	ext_out = ['.h']

class ts2qm(Task.Task):
	"""
	Create *.qm* files from *.ts* files
	"""
	color   = 'BLUE'
	run_str = '${QT_LRELEASE} ${QT_LRELEASE_FLAGS} ${SRC} -qm ${TGT}'

class qm2rcc(Task.Task):
	"""
	Transform *.qm* files into *.rc* files
	"""
	color = 'BLUE'
	after = 'ts2qm'

	def run(self):
		"""Create a qrc file including the inputs"""
		txt = '\n'.join(['<file>%s</file>' % k.path_from(self.outputs[0].parent) for k in self.inputs])
		code = '<!DOCTYPE RCC><RCC version="1.0">\n<qresource>\n%s\n</qresource>\n</RCC>' % txt
		self.outputs[0].write(code)

def configure(self):
	"""
	Besides the configuration options, the environment variable QT4_ROOT may be used
	to give the location of the qt4 libraries (absolute path).

	The detection will use the program *pkg-config* through :py:func:`waflib.Tools.config_c.check_cfg`
	"""
	self.find_qt4_binaries()
	self.set_qt4_libs_to_check()
	self.set_qt4_defines()
	self.find_qt4_libraries()
	self.add_qt4_rpath()
	self.simplify_qt4_libs()

@conf
def find_qt4_binaries(self):
	env = self.env
	opt = Options.options

	qtdir = getattr(opt, 'qtdir', '')
	qtbin = getattr(opt, 'qtbin', '')

	paths = []

	if qtdir:
		qtbin = os.path.join(qtdir, 'bin')

	# the qt directory has been given from QT4_ROOT - deduce the qt binary path
	if not qtdir:
		qtdir = os.environ.get('QT4_ROOT', '')
		qtbin = os.environ.get('QT4_BIN', None) or os.path.join(qtdir, 'bin')

	if qtbin:
		paths = [qtbin]

	# no qtdir, look in the path and in /usr/local/Trolltech
	if not qtdir:
		paths = os.environ.get('PATH', '').split(os.pathsep)
		paths.append('/usr/share/qt4/bin/')
		try:
			lst = Utils.listdir('/usr/local/Trolltech/')
		except OSError:
			pass
		else:
			if lst:
				lst.sort()
				lst.reverse()

				# keep the highest version
				qtdir = '/usr/local/Trolltech/%s/' % lst[0]
				qtbin = os.path.join(qtdir, 'bin')
				paths.append(qtbin)

	# at the end, try to find qmake in the paths given
	# keep the one with the highest version
	cand = None
	prev_ver = ['4', '0', '0']
	for qmk in ['qmake-qt4', 'qmake4', 'qmake']:
		try:
			qmake = self.find_program(qmk, path_list=paths)
		except self.errors.ConfigurationError:
			pass
		else:
			try:
				version = self.cmd_and_log([qmake, '-query', 'QT_VERSION']).strip()
			except self.errors.WafError:
				pass
			else:
				if version:
					new_ver = version.split('.')
					if new_ver > prev_ver:
						cand = qmake
						prev_ver = new_ver
	if cand:
		self.env.QMAKE = cand
	else:
		self.fatal('Could not find qmake for qt4')

	qtbin = self.cmd_and_log([self.env.QMAKE, '-query', 'QT_INSTALL_BINS']).strip() + os.sep

	def find_bin(lst, var):
		if var in env:
			return
		for f in lst:
			try:
				ret = self.find_program(f, path_list=paths)
			except self.errors.ConfigurationError:
				pass
			else:
				env[var]=ret
				break

	find_bin(['uic-qt3', 'uic3'], 'QT_UIC3')
	find_bin(['uic-qt4', 'uic'], 'QT_UIC')
	if not env['QT_UIC']:
		self.fatal('cannot find the uic compiler for qt4')

	try:
		uicver = self.cmd_and_log(env['QT_UIC'] + " -version 2>&1").strip()
	except self.errors.ConfigurationError:
		self.fatal('this uic compiler is for qt3, add uic for qt4 to your path')
	uicver = uicver.replace('Qt User Interface Compiler ','').replace('User Interface Compiler for Qt', '')
	self.msg('Checking for uic version', '%s' % uicver)
	if uicver.find(' 3.') != -1:
		self.fatal('this uic compiler is for qt3, add uic for qt4 to your path')

	find_bin(['moc-qt4', 'moc'], 'QT_MOC')
	find_bin(['rcc'], 'QT_RCC')
	find_bin(['lrelease-qt4', 'lrelease'], 'QT_LRELEASE')
	find_bin(['lupdate-qt4', 'lupdate'], 'QT_LUPDATE')

	env['UIC3_ST']= '%s -o %s'
	env['UIC_ST'] = '%s -o %s'
	env['MOC_ST'] = '-o'
	env['ui_PATTERN'] = 'ui_%s.h'
	env['QT_LRELEASE_FLAGS'] = ['-silent']
	env.MOCCPPPATH_ST = '-I%s'
	env.MOCDEFINES_ST = '-D%s'

@conf
def find_qt4_libraries(self):
	qtlibs = getattr(Options.options, 'qtlibs', None) or os.environ.get("QT4_LIBDIR", None)
	if not qtlibs:
		try:
			qtlibs = self.cmd_and_log([self.env.QMAKE, '-query', 'QT_INSTALL_LIBS']).strip()
		except Errors.WafError:
			qtdir = self.cmd_and_log([self.env.QMAKE, '-query', 'QT_INSTALL_PREFIX']).strip() + os.sep
			qtlibs = os.path.join(qtdir, 'lib')
	self.msg('Found the Qt4 libraries in', qtlibs)

	qtincludes =  os.environ.get("QT4_INCLUDES", None) or self.cmd_and_log([self.env.QMAKE, '-query', 'QT_INSTALL_HEADERS']).strip()
	env = self.env
	if not 'PKG_CONFIG_PATH' in os.environ:
		os.environ['PKG_CONFIG_PATH'] = '%s:%s/pkgconfig:/usr/lib/qt4/lib/pkgconfig:/opt/qt4/lib/pkgconfig:/usr/lib/qt4/lib:/opt/qt4/lib' % (qtlibs, qtlibs)

	try:
		if os.environ.get("QT4_XCOMPILE", None):
			raise self.errors.ConfigurationError()
		self.check_cfg(atleast_pkgconfig_version='0.1')
	except self.errors.ConfigurationError:
		for i in self.qt4_vars:
			uselib = i.upper()
			if Utils.unversioned_sys_platform() == "darwin":
				# Since at least qt 4.7.3 each library locates in separate directory
				frameworkName = i + ".framework"
				qtDynamicLib = os.path.join(qtlibs, frameworkName, i)
				if os.path.exists(qtDynamicLib):
					env.append_unique('FRAMEWORK_' + uselib, i)
					self.msg('Checking for %s' % i, qtDynamicLib, 'GREEN')
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtlibs, frameworkName, 'Headers'))
			elif env.DEST_OS != "win32":
				qtDynamicLib = os.path.join(qtlibs, "lib" + i + ".so")
				qtStaticLib = os.path.join(qtlibs, "lib" + i + ".a")
				if os.path.exists(qtDynamicLib):
					env.append_unique('LIB_' + uselib, i)
					self.msg('Checking for %s' % i, qtDynamicLib, 'GREEN')
				elif os.path.exists(qtStaticLib):
					env.append_unique('LIB_' + uselib, i)
					self.msg('Checking for %s' % i, qtStaticLib, 'GREEN')
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))
			else:
				# Release library names are like QtCore4
				for k in ("lib%s.a", "lib%s4.a", "%s.lib", "%s4.lib"):
					lib = os.path.join(qtlibs, k % i)
					if os.path.exists(lib):
						env.append_unique('LIB_' + uselib, i + k[k.find("%s") + 2 : k.find('.')])
						self.msg('Checking for %s' % i, lib, 'GREEN')
						break
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))

				# Debug library names are like QtCore4d
				uselib = i.upper() + "_debug"
				for k in ("lib%sd.a", "lib%sd4.a", "%sd.lib", "%sd4.lib"):
					lib = os.path.join(qtlibs, k % i)
					if os.path.exists(lib):
						env.append_unique('LIB_' + uselib, i + k[k.find("%s") + 2 : k.find('.')])
						self.msg('Checking for %s' % i, lib, 'GREEN')
						break
				else:
					self.msg('Checking for %s' % i, False, 'YELLOW')

				env.append_unique('LIBPATH_' + uselib, qtlibs)
				env.append_unique('INCLUDES_' + uselib, qtincludes)
				env.append_unique('INCLUDES_' + uselib, os.path.join(qtincludes, i))
	else:
		for i in self.qt4_vars_debug + self.qt4_vars:
			self.check_cfg(package=i, args='--cflags --libs', mandatory=False)

@conf
def simplify_qt4_libs(self):
	# the libpaths make really long command-lines
	# remove the qtcore ones from qtgui, etc
	env = self.env
	def process_lib(vars_, coreval):
		for d in vars_:
			var = d.upper()
			if var == 'QTCORE':
				continue

			value = env['LIBPATH_'+var]
			if value:
				core = env[coreval]
				accu = []
				for lib in value:
					if lib in core:
						continue
					accu.append(lib)
				env['LIBPATH_'+var] = accu

	process_lib(self.qt4_vars,       'LIBPATH_QTCORE')
	process_lib(self.qt4_vars_debug, 'LIBPATH_QTCORE_DEBUG')

@conf
def add_qt4_rpath(self):
	# rpath if wanted
	env = self.env
	if Options.options.want_rpath:
		def process_rpath(vars_, coreval):
			for d in vars_:
				var = d.upper()
				value = env['LIBPATH_'+var]
				if value:
					core = env[coreval]
					accu = []
					for lib in value:
						if var != 'QTCORE':
							if lib in core:
								continue
						accu.append('-Wl,--rpath='+lib)
					env['RPATH_'+var] = accu
		process_rpath(self.qt4_vars,       'LIBPATH_QTCORE')
		process_rpath(self.qt4_vars_debug, 'LIBPATH_QTCORE_DEBUG')

@conf
def set_qt4_libs_to_check(self):
	if not hasattr(self, 'qt4_vars'):
		self.qt4_vars = QT4_LIBS
	self.qt4_vars = Utils.to_list(self.qt4_vars)
	if not hasattr(self, 'qt4_vars_debug'):
		self.qt4_vars_debug = [a + '_debug' for a in self.qt4_vars]
	self.qt4_vars_debug = Utils.to_list(self.qt4_vars_debug)

@conf
def set_qt4_defines(self):
	if sys.platform != 'win32':
		return
	for x in self.qt4_vars:
		y = x[2:].upper()
		self.env.append_unique('DEFINES_%s' % x.upper(), 'QT_%s_LIB' % y)
		self.env.append_unique('DEFINES_%s_DEBUG' % x.upper(), 'QT_%s_LIB' % y)

def options(opt):
	"""
	Command-line options
	"""
	opt.add_option('--want-rpath', action='store_true', default=False, dest='want_rpath', help='enable the rpath for qt libraries')

	opt.add_option('--header-ext',
		type='string',
		default='',
		help='header extension for moc files',
		dest='qt_header_ext')

	for i in 'qtdir qtbin qtlibs'.split():
		opt.add_option('--'+i, type='string', default='', dest=i)

	opt.add_option('--translate', action="store_true", help="collect translation strings", dest="trans_qt4", default=False)