aboutsummaryrefslogtreecommitdiffstats
path: root/meson/tools/cmake2meson.py
blob: a12d9cf1f389c15f730a8a000d32e2d48fe92981 (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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
#!/usr/bin/env python3

# Copyright 2014 Jussi Pakkanen

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import typing as T
from pathlib import Path
import sys
import re
import argparse


class Token:
    def __init__(self, tid: str, value: str):
        self.tid = tid
        self.value = value
        self.lineno = 0
        self.colno = 0

class Statement:
    def __init__(self, name: str, args: list):
        self.name = name.lower()
        self.args = args

class Lexer:
    def __init__(self) -> None:
        self.token_specification = [
            # Need to be sorted longest to shortest.
            ('ignore', re.compile(r'[ \t]')),
            ('string', re.compile(r'"([^\\]|(\\.))*?"', re.M)),
            ('varexp', re.compile(r'\${[-_0-9a-z/A-Z.]+}')),
            ('id', re.compile('''[,-><${}=+_0-9a-z/A-Z|@.*]+''')),
            ('eol', re.compile(r'\n')),
            ('comment', re.compile(r'#.*')),
            ('lparen', re.compile(r'\(')),
            ('rparen', re.compile(r'\)')),
        ]

    def lex(self, code: str) -> T.Iterator[Token]:
        lineno = 1
        line_start = 0
        loc = 0
        col = 0
        while loc < len(code):
            matched = False
            for (tid, reg) in self.token_specification:
                mo = reg.match(code, loc)
                if mo:
                    col = mo.start() - line_start
                    matched = True
                    loc = mo.end()
                    match_text = mo.group()
                    if tid == 'ignore':
                        continue
                    if tid == 'comment':
                        yield(Token('comment', match_text))
                    elif tid == 'lparen':
                        yield(Token('lparen', '('))
                    elif tid == 'rparen':
                        yield(Token('rparen', ')'))
                    elif tid == 'string':
                        yield(Token('string', match_text[1:-1]))
                    elif tid == 'id':
                        yield(Token('id', match_text))
                    elif tid == 'eol':
                        # yield('eol')
                        lineno += 1
                        col = 1
                        line_start = mo.end()
                    elif tid == 'varexp':
                        yield(Token('varexp', match_text[2:-1]))
                    else:
                        raise ValueError(f'lex: unknown element {tid}')
                    break
            if not matched:
                raise ValueError('Lexer got confused line %d column %d' % (lineno, col))

class Parser:
    def __init__(self, code: str) -> None:
        self.stream = Lexer().lex(code)
        self.getsym()

    def getsym(self) -> None:
        try:
            self.current = next(self.stream)
        except StopIteration:
            self.current = Token('eof', '')

    def accept(self, s: str) -> bool:
        if self.current.tid == s:
            self.getsym()
            return True
        return False

    def expect(self, s: str) -> bool:
        if self.accept(s):
            return True
        raise ValueError(f'Expecting {s} got {self.current.tid}.', self.current.lineno, self.current.colno)

    def statement(self) -> Statement:
        cur = self.current
        if self.accept('comment'):
            return Statement('_', [cur.value])
        self.accept('id')
        self.expect('lparen')
        args = self.arguments()
        self.expect('rparen')
        return Statement(cur.value, args)

    def arguments(self) -> T.List[T.Union[Token, T.Any]]:
        args = []  # type: T.List[T.Union[Token, T.Any]]
        if self.accept('lparen'):
            args.append(self.arguments())
            self.expect('rparen')
        arg = self.current
        if self.accept('comment'):
            rest = self.arguments()
            args += rest
        elif self.accept('string') \
                or self.accept('varexp') \
                or self.accept('id'):
            args.append(arg)
            rest = self.arguments()
            args += rest
        return args

    def parse(self) -> T.Iterator[Statement]:
        while not self.accept('eof'):
            yield(self.statement())

def token_or_group(arg: T.Union[Token, T.List[Token]]) -> str:
    if isinstance(arg, Token):
        return ' ' + arg.value
    elif isinstance(arg, list):
        line = ' ('
        for a in arg:
            line += ' ' + token_or_group(a)
        line += ' )'
        return line
    raise RuntimeError('Conversion error in token_or_group')

class Converter:
    ignored_funcs = {'cmake_minimum_required': True,
                     'enable_testing': True,
                     'include': True}

    def __init__(self, cmake_root: str):
        self.cmake_root = Path(cmake_root).expanduser()
        self.indent_unit = '  '
        self.indent_level = 0
        self.options = []  # type: T.List[tuple]

    def convert_args(self, args: T.List[Token], as_array: bool = True) -> str:
        res = []
        if as_array:
            start = '['
            end = ']'
        else:
            start = ''
            end = ''
        for i in args:
            if i.tid == 'id':
                res.append("'%s'" % i.value)
            elif i.tid == 'varexp':
                res.append('%s' % i.value.lower())
            elif i.tid == 'string':
                res.append("'%s'" % i.value)
            else:
                raise ValueError(f'Unknown arg type {i.tid}')
        if len(res) > 1:
            return start + ', '.join(res) + end
        if len(res) == 1:
            return res[0]
        return ''

    def write_entry(self, outfile: T.TextIO, t: Statement) -> None:
        if t.name in Converter.ignored_funcs:
            return
        preincrement = 0
        postincrement = 0
        if t.name == '_':
            line = t.args[0]
        elif t.name == 'add_subdirectory':
            line = "subdir('" + t.args[0].value + "')"
        elif t.name == 'pkg_search_module' or t.name == 'pkg_search_modules':
            varname = t.args[0].value.lower()
            mods = ["dependency('%s')" % i.value for i in t.args[1:]]
            if len(mods) == 1:
                line = '{} = {}'.format(varname, mods[0])
            else:
                line = '{} = [{}]'.format(varname, ', '.join(["'%s'" % i for i in mods]))
        elif t.name == 'find_package':
            line = "{}_dep = dependency('{}')".format(t.args[0].value, t.args[0].value)
        elif t.name == 'find_library':
            line = "{} = find_library('{}')".format(t.args[0].value.lower(), t.args[0].value)
        elif t.name == 'add_executable':
            line = '{}_exe = executable({})'.format(t.args[0].value, self.convert_args(t.args, False))
        elif t.name == 'add_library':
            if t.args[1].value == 'SHARED':
                libcmd = 'shared_library'
                args = [t.args[0]] + t.args[2:]
            elif t.args[1].value == 'STATIC':
                libcmd = 'static_library'
                args = [t.args[0]] + t.args[2:]
            else:
                libcmd = 'library'
                args = t.args
            line = '{}_lib = {}({})'.format(t.args[0].value, libcmd, self.convert_args(args, False))
        elif t.name == 'add_test':
            line = 'test(%s)' % self.convert_args(t.args, False)
        elif t.name == 'option':
            optname = t.args[0].value
            description = t.args[1].value
            if len(t.args) > 2:
                default = t.args[2].value
            else:
                default = None
            self.options.append((optname, description, default))
            return
        elif t.name == 'project':
            pname = t.args[0].value
            args = [pname]
            for l in t.args[1:]:
                l = l.value.lower()
                if l == 'cxx':
                    l = 'cpp'
                args.append(l)
            args = ["'%s'" % i for i in args]
            line = 'project(' + ', '.join(args) + ", default_options : ['default_library=static'])"
        elif t.name == 'set':
            varname = t.args[0].value.lower()
            line = '{} = {}\n'.format(varname, self.convert_args(t.args[1:]))
        elif t.name == 'if':
            postincrement = 1
            try:
                line = 'if %s' % self.convert_args(t.args, False)
            except AttributeError:  # complex if statements
                line = t.name
                for arg in t.args:
                    line += token_or_group(arg)
        elif t.name == 'elseif':
            preincrement = -1
            postincrement = 1
            try:
                line = 'elif %s' % self.convert_args(t.args, False)
            except AttributeError:  # complex if statements
                line = t.name
                for arg in t.args:
                    line += token_or_group(arg)
        elif t.name == 'else':
            preincrement = -1
            postincrement = 1
            line = 'else'
        elif t.name == 'endif':
            preincrement = -1
            line = 'endif'
        else:
            line = '''# {}({})'''.format(t.name, self.convert_args(t.args))
        self.indent_level += preincrement
        indent = self.indent_level * self.indent_unit
        outfile.write(indent)
        outfile.write(line)
        if not(line.endswith('\n')):
            outfile.write('\n')
        self.indent_level += postincrement

    def convert(self, subdir: Path = None) -> None:
        if not subdir:
            subdir = self.cmake_root
        cfile = Path(subdir).expanduser() / 'CMakeLists.txt'
        try:
            with cfile.open(encoding='utf-8') as f:
                cmakecode = f.read()
        except FileNotFoundError:
            print('\nWarning: No CMakeLists.txt in', subdir, '\n', file=sys.stderr)
            return
        p = Parser(cmakecode)
        with (subdir / 'meson.build').open('w', encoding='utf-8') as outfile:
            for t in p.parse():
                if t.name == 'add_subdirectory':
                    # print('\nRecursing to subdir',
                    #       self.cmake_root / t.args[0].value,
                    #       '\n')
                    self.convert(subdir / t.args[0].value)
                    # print('\nReturning to', self.cmake_root, '\n')
                self.write_entry(outfile, t)
        if subdir == self.cmake_root and len(self.options) > 0:
            self.write_options()

    def write_options(self) -> None:
        filename = self.cmake_root / 'meson_options.txt'
        with filename.open('w', encoding='utf-8') as optfile:
            for o in self.options:
                (optname, description, default) = o
                if default is None:
                    typestr = ''
                    defaultstr = ''
                else:
                    if default == 'OFF':
                        typestr = ' type : \'boolean\','
                        default = 'false'
                    elif default == 'ON':
                        default = 'true'
                        typestr = ' type : \'boolean\','
                    else:
                        typestr = ' type : \'string\','
                    defaultstr = ' value : %s,' % default
                line = "option({!r},{}{} description : '{}')\n".format(optname,
                                                                 typestr,
                                                                 defaultstr,
                                                                 description)
                optfile.write(line)

if __name__ == '__main__':
    p = argparse.ArgumentParser(description='Convert CMakeLists.txt to meson.build and meson_options.txt')
    p.add_argument('cmake_root', help='CMake project root (where top-level CMakeLists.txt is)')
    P = p.parse_args()

    Converter(P.cmake_root).convert()