aboutsummaryrefslogtreecommitdiff
path: root/extras/swig.py
blob: fd3d6d2c99504c3174822ae12fe19e7901e797de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
#! /usr/bin/env python
# encoding: UTF-8
# Petar Forai
# Thomas Nagy 2008-2010 (ita)

import re
from waflib import Task, Logs
from waflib.TaskGen import extension, feature, after_method
from waflib.Configure import conf
from waflib.Tools import c_preproc

"""
tasks have to be added dynamically:
- swig interface files may be created at runtime
- the module name may be unknown in advance
"""

SWIG_EXTS = ['.swig', '.i']

re_module = re.compile('%module(?:\s*\(.*\))?\s+(.+)', re.M)

re_1 = re.compile(r'^%module.*?\s+([\w]+)\s*?$', re.M)
re_2 = re.compile('[#%]include [<"](.*)[">]', re.M)

class swig(Task.Task):
	color   = 'BLUE'
	run_str = '${SWIG} ${SWIGFLAGS} ${SWIGPATH_ST:INCPATHS} ${SWIGDEF_ST:DEFINES} ${SRC}'
	ext_out = ['.h'] # might produce .h files although it is not mandatory
	vars = ['SWIG_VERSION', 'SWIGDEPS']

	def runnable_status(self):
		for t in self.run_after:
			if not t.hasrun:
				return Task.ASK_LATER

		if not getattr(self, 'init_outputs', None):
			self.init_outputs = True
			if not getattr(self, 'module', None):
				# search the module name
				txt = self.inputs[0].read()
				m = re_module.search(txt)
				if not m:
					raise ValueError("could not find the swig module name")
				self.module = m.group(1)

			swig_c(self)

			# add the language-specific output files as nodes
			# call funs in the dict swig_langs
			for x in self.env['SWIGFLAGS']:
				# obtain the language
				x = x[1:]
				try:
					fun = swig_langs[x]
				except KeyError:
					pass
				else:
					fun(self)

		return super(swig, self).runnable_status()

	def scan(self):
		"scan for swig dependencies, climb the .i files"
		lst_src = []

		seen = []
		missing = []
		to_see = [self.inputs[0]]

		while to_see:
			node = to_see.pop(0)
			if node in seen:
				continue
			seen.append(node)
			lst_src.append(node)

			# read the file
			code = node.read()
			code = c_preproc.re_nl.sub('', code)
			code = c_preproc.re_cpp.sub(c_preproc.repl, code)

			# find .i files and project headers
			names = re_2.findall(code)
			for n in names:
				for d in self.generator.includes_nodes + [node.parent]:
					u = d.find_resource(n)
					if u:
						to_see.append(u)
						break
				else:
					missing.append(n)
		return (lst_src, missing)

# provide additional language processing
swig_langs = {}
def swigf(fun):
	swig_langs[fun.__name__.replace('swig_', '')] = fun
	return fun
swig.swigf = swigf

def swig_c(self):
	ext = '.swigwrap_%d.c' % self.generator.idx
	flags = self.env['SWIGFLAGS']
	if '-c++' in flags:
		ext += 'xx'
	out_node = self.inputs[0].parent.find_or_declare(self.module + ext)

	if '-c++' in flags:
		c_tsk = self.generator.cxx_hook(out_node)
	else:
		c_tsk = self.generator.c_hook(out_node)

	c_tsk.set_run_after(self)

	# transfer weights from swig task to c task
	if getattr(self, 'weight', None):
		c_tsk.weight = self.weight
	if getattr(self, 'tree_weight', None):
		c_tsk.tree_weight = self.tree_weight

	try:
		self.more_tasks.append(c_tsk)
	except AttributeError:
		self.more_tasks = [c_tsk]

	try:
		ltask = self.generator.link_task
	except AttributeError:
		pass
	else:
		ltask.set_run_after(c_tsk)
		# setting input nodes does not declare the build order
		# because the build already started, but it sets
		# the dependency to enable rebuilds
		ltask.inputs.append(c_tsk.outputs[0])

	self.outputs.append(out_node)

	if not '-o' in self.env['SWIGFLAGS']:
		self.env.append_value('SWIGFLAGS', ['-o', self.outputs[0].abspath()])

@swigf
def swig_python(tsk):
	node = tsk.inputs[0].parent
	if tsk.outdir:
		node = tsk.outdir
	tsk.set_outputs(node.find_or_declare(tsk.module+'.py'))

@swigf
def swig_ocaml(tsk):
	node = tsk.inputs[0].parent
	if tsk.outdir:
		node = tsk.outdir
	tsk.set_outputs(node.find_or_declare(tsk.module+'.ml'))
	tsk.set_outputs(node.find_or_declare(tsk.module+'.mli'))

@extension(*SWIG_EXTS)
def i_file(self, node):
	# the task instance
	tsk = self.create_task('swig')
	tsk.set_inputs(node)
	tsk.module = getattr(self, 'swig_module', None)

	flags = self.to_list(getattr(self, 'swig_flags', []))
	tsk.env.append_value('SWIGFLAGS', flags)

	tsk.outdir = None
	if '-outdir' in flags:
		outdir = flags[flags.index('-outdir')+1]
		outdir = tsk.generator.bld.bldnode.make_node(outdir)
		outdir.mkdir()
		tsk.outdir = outdir

@feature('c', 'cxx', 'd', 'fc', 'asm')
@after_method('apply_link', 'process_source')
def enforce_swig_before_link(self):
	try:
		link_task = self.link_task
	except AttributeError:
		pass
	else:
		for x in self.tasks:
			if x.__class__.__name__ == 'swig':
				link_task.run_after.add(x)

@conf
def check_swig_version(conf, minver=None):
	"""
	Check if the swig tool is found matching a given minimum version.
	minver should be a tuple, eg. to check for swig >= 1.3.28 pass (1,3,28) as minver.

	If successful, SWIG_VERSION is defined as 'MAJOR.MINOR'
	(eg. '1.3') of the actual swig version found.

	:param minver: minimum version
	:type minver: tuple of int
	:return: swig version
	:rtype: tuple of int
	"""
	assert minver is None or isinstance(minver, tuple)
	swigbin = conf.env['SWIG']
	if not swigbin:
		conf.fatal('could not find the swig executable')

	# Get swig version string
	cmd = swigbin + ['-version']
	Logs.debug('swig: Running swig command %r', cmd)
	reg_swig = re.compile(r'SWIG Version\s(.*)', re.M)
	swig_out = conf.cmd_and_log(cmd)
	swigver_tuple = tuple([int(s) for s in reg_swig.findall(swig_out)[0].split('.')])

	# Compare swig version with the minimum required
	result = (minver is None) or (swigver_tuple >= minver)

	if result:
		# Define useful environment variables
		swigver = '.'.join([str(x) for x in swigver_tuple[:2]])
		conf.env['SWIG_VERSION'] = swigver

	# Feedback
	swigver_full = '.'.join(map(str, swigver_tuple[:3]))
	if minver is None:
		conf.msg('Checking for swig version', swigver_full)
	else:
		minver_str = '.'.join(map(str, minver))
		conf.msg('Checking for swig version >= %s' % (minver_str,), swigver_full, color=result and 'GREEN' or 'YELLOW')

	if not result:
		conf.fatal('The swig version is too old, expecting %r' % (minver,))

	return swigver_tuple

def configure(conf):
	conf.find_program('swig', var='SWIG')
	conf.env.SWIGPATH_ST = '-I%s'
	conf.env.SWIGDEF_ST = '-D%s'