| #!/usr/bin/env python3 |
| # SPDX-License-Identifier: Apache-2.0 |
| # Copyright 2014 Jussi Pakkanen |
| |
| 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: 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: T.List[T.Tuple[str, str, T.Optional[str]]] = [] |
| |
| 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() |
